CN212003212U - Two lining quick construction structures in multiple variable cross section undercut tunnel - Google Patents
Two lining quick construction structures in multiple variable cross section undercut tunnel Download PDFInfo
- Publication number
- CN212003212U CN212003212U CN202020400096.1U CN202020400096U CN212003212U CN 212003212 U CN212003212 U CN 212003212U CN 202020400096 U CN202020400096 U CN 202020400096U CN 212003212 U CN212003212 U CN 212003212U
- Authority
- CN
- China
- Prior art keywords
- arch
- support
- lining
- fixedly connected
- longitudinal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Lining And Supports For Tunnels (AREA)
Abstract
The utility model discloses a second lining rapid construction structure of a multi-variable cross section subsurface tunnel, belonging to the technical field of tunnel engineering, comprising a template moving bracket, wherein the template moving bracket is used for supporting and fixing a second lining template; the arch center comprises an arch support, a stand column, a beam and an arch wall arch center, wherein one end of the arch support is fixedly connected with the second lining template, and the other end of the arch support is fixedly connected with the stand column; the other end of the upright post is fixedly connected with the top end of the cross beam; the bottom end of the cross beam is fixedly connected with the top end of the temporary inverted arch support; one end of the arch wall arch center is fixedly connected with the two lining templates, and the other end of the arch wall arch center is fixedly connected with the cross rod; and a track is arranged at the top of the temporary support of the underground excavation tunnel, is matched with the arch frame and is used for drawing the whole arch frame to the next section of the second lining by adopting an electric hoist or a chain block according to the weight after the pouring of the second lining is finished. The utility model provides a can deal with the tunnel length shorter and section kind many, time limit for a project short, the low multiple variable cross section undercut tunnel of cost input two lining quick construction structures.
Description
Technical Field
The utility model belongs to the technical field of tunnel engineering, especially, relate to two lining quick construction structures in multiple variable cross section undercut tunnel in two lateral wall pilot tunnel methods.
Background
Due to the fact that the requirements are set functionally in tunnel construction, the sizes of the sections of the tunnels are variable, and particularly, the subway tunnels are often designed with several to more than ten sections with different sizes. The section of a parking line YDK11+197.880-YDK11+401.200 between a ninth-number line TGSG-5 standard Hongqing station-purple clouds three-way station area of the Xian subway is constructed by a shallow buried underground excavation method, the underground excavation tunnel of the section adopts a horseshoe-shaped section and has the total length of 203m, the sections are A, B, C, D, E five sections and A-B transition sections (total 6 types), the underground excavation section A is constructed by a CRD method, the underground excavation section B, C, D, E sections are all constructed by a double-side-wall pit guide method, and the procedure of the transition section surface is changed from the CRD method to the double-side-wall pit guide method. For the construction of the tunnel secondary lining with short length and various sections, two traditional construction methods are adopted, the most common method is to adopt a plurality of lining trolleys corresponding to the sections, and the other method adopts a scattered formwork assembly mode of a full framing to pour. In the first method, the construction cost can be greatly increased by a plurality of trolleys, and when the opening of the hole is a small-section hole and the inside of the hole is a large-section hole, the assembly and disassembly of the trolleys must be carried out in the hole, so that the construction difficulty and the construction period are increased; the second method has the problems of large workload of erecting and dismantling the full-scale support and high working difficulty of small-block scattered die assembly which has higher construction requirement.
Therefore, a method and a structure for rapidly constructing a secondary lining of a variable-section subsurface tunnel, which can cope with various short tunnel lengths, various sections, short construction period and low cost investment, are urgently needed.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a can deal with the tunnel length shorter and section kind many, the time limit for a project short, the cost drops into low multiple variable cross section undercut tunnel of double side wall pilot tunnel two lining quick construction method and structure. The content of the utility model is as follows:
a kind of multiple variable cross section subsurface tunnel two-lining fast construction structure, including movable support of template and partition wall, the said movable support of template is at least 2 pieces in quantity, is used for the support and fixation of two lining templates; the template moving support comprises an arch frame and a temporary inverted arch support; the arch center comprises an arch support, a stand column, a cross beam and an arch wall arch center, wherein one end of the arch support is fixedly connected with the two lining templates, and the other end of the arch support is fixedly connected with the stand column; the other end of the upright post is fixedly connected to the top end of the cross beam; the bottom end of the cross beam is fixedly connected with the top end of the support at the temporary inverted arch; one end of the arch wall arch frame is fixedly connected with the two lining templates, and the other end of the arch wall arch frame is fixedly connected with the temporary inverted arch support; the arch part support is fixedly connected with the arch frame of the arch wall; a connecting beam is arranged between the cross beams of each template moving support; the partition walls comprise longitudinal partition walls and transverse partition walls, and when the template moving support is assembled, the longitudinal partition walls corresponding to the height of the arch center are disassembled; a rail is arranged on the dismantled longitudinal partition wall, the rail comprises a support frame and a sliding wheel, the support frame is fixedly connected to the dismantled longitudinal partition wall, and the sliding wheel is fixedly connected to the support frame; the sliding wheel is in sliding fit with the connecting beam and used for dragging the whole arch centering to a next section of second lining by using an electric hoist or a chain block according to the weight of the arch centering after the second lining is poured; the upright columns and the cross beams are provided with different specifications and sizes and are used for being selected according to the requirements of variable cross section tunnel secondary lining templates and the size of the arch frame.
Furthermore, the temporary inverted arch support comprises a temporary inverted arch lower support and a temporary inverted arch upper support, the temporary inverted arch lower support and the temporary inverted arch upper support comprise vertical rods, longitudinal horizontal rods, longitudinal floor sweeping rods and transverse floor sweeping rods, and fixing seats are arranged at the bottoms of the vertical rods and used for fixing the vertical rods to the inverted arches; the longitudinal floor sweeping rod is fixed on the vertical rod at the bottom of the fixed seat, which is not more than 200mm, by adopting a right-angle fastener; the transverse sweeping rod is fixed on the vertical rod which is close to the lower part of the longitudinal sweeping rod by adopting a right-angle fastener; the top end of the upright stanchion is provided with a jacking used for fixedly connecting the cross beam with the upright stanchion; the arch wall arch center is fixedly connected with the horizontal rod.
Furthermore, the temporary inverted arch support adopts a fastener type scaffold, and the arrangement distance of upright rods is 900 multiplied by 750mm, and the step pitch is 900mm, so that the support is used for supporting the arch; the outer side and the inner side of the temporary inverted arch support are longitudinally and transversely arranged at intervals of 5m and not less than 3m, vertical cross braces are continuously arranged from bottom to top, and the bottom end of each cross brace rod piece is tightly propped against the ground; the included angle between the diagonal rods of the cross braces and the ground is 45-60 degrees, and each span of the diagonal rods is buckled with the vertical rod; a horizontal bridging should be arranged on the plane of the top intersection point of the vertical bridging, a horizontal bridging should be arranged on the floor sweeping rod, and the vertical or horizontal included angle between the horizontal bridging and the temporary inverted arch support should be 45-60 degrees.
Furthermore, the longitudinal horizontal rods are lengthened by adopting butt fasteners, and joints of two adjacent longitudinal horizontal rods are not arranged in a synchronous or same span; the staggered distance in the horizontal direction between two adjacent joints which are not synchronous or different is not less than 500 mm; the distance from the center of each joint to the nearest main node is not greater than 1/3 of the longitudinal distance; the distance from the joint to the vertical rod is not more than 300 mm; vertical horizontal pole adopts the overlap joint, and wherein overlap joint length is no less than 1000mm, and the overlap joint sets up 3 rotatory fasteners fixed, and rotatory fastener apron edge is not less than 100mm to the rod end of overlap joint pole.
Furthermore, the arch part support and the arch wall arch frame are pre-bent into sections by adopting an I18I-steel ground surface cold bending machine, and the inner parts of the holes are spliced into roof trusses; the upright posts and the cross beams are made of I14I-shaped steel and are arranged horizontally according to the horizontal spacing and the jacking position of the scaffold, and the longitudinal spacing is arranged according to the longitudinal spacing 750mm of the scaffold.
The utility model discloses beneficial effect:
1) safety: in the second lining construction of the large-section double-side-wall pit guiding method, the temporary support needs to be completely removed by the traditional trolley method, the temporary support can be partially removed by stages by adopting the movable support, and the risk of long-time blank deformation of the initial support after the temporary support is removed is reduced; for traditional mode, the utility model provides a stability of its formwork system of shaped steel bow member, crossbeam, stand that the movable support adopted is higher, and the security of pouring the in-process obtains promoting.
2) The economic efficiency is as follows: compare this method of platform truck construction has very big economic advantage, the utility model discloses 5 kinds of sections in the trapped railway undercut tunnel and 1 kind of changeover portion section need adopt 4 lining cutting platform trucks at least, and the expense of every lining cutting platform truck is about 45 ten thousand yuan probably, amounts to 180 ten thousand yuan, even adopt a platform truck + the mode of changing the panel also need 90-100 ten thousand yuan at least, and adopt the utility model discloses a support system total cost only needs about 25 ten thousand yuan.
3) And (3) comparing work efficiency: in the process of installing the template, the trolley needs to be installed for more than 15 days, and the template needs to be installed for 1 day each time; the installation of the template and the supporting system in each loose die assembly needs about 10 days; the utility model discloses an installation needs 7 days for the first time of movable support and template among the construction method, and the installation needs 3 days at every turn later, and the work efficiency is optimal.
4) The technical operability is as follows: compared with trolley construction, the movable support provided by the utility model has the advantages that the installation of the template and the supporting system in the hole is more convenient, the forward movement can be simply and effectively realized by adopting the integral traction of the chain block, and the mechanical cooperation is needed due to the heavy weight and large volume of the components in the trolley installation, so that the mechanical operation installation difficulty is large in the narrow space in the hole; compare in loose mould pin-connected panel mode, the utility model discloses a remove movable support possess the advantage that the support system modularization was set up convenience, the template installation location is convenient.
Drawings
FIG. 1 is a flow chart of a method for rapidly constructing multiple variable-section subsurface tunnel secondary linings
FIG. 2 is a schematic view of a structural section of a multi-variable-section underground excavation tunnel secondary lining rapid construction structure
FIG. 3 is a schematic diagram of longitudinal arrangement of a multi-variable-section underground excavation tunnel secondary lining rapid construction structure
FIG. 4 is a detailed view of a formwork support system
Plug template structure of figure 5
Wherein, 1-an arch frame; 11-arch support; 12-a column; 13-a cross beam; 14-arch wall arch centering; 2-temporary inverted arch support; 21-a cross bar; 22-upright stanchion; 23-a diagonal rod; 3-two liners; 4-two lining templates; 5-primary branch; 6-inverted arch, 7-longitudinal partition wall; 8-orbit; 81-a sliding wheel; 82-a support frame; 9-connecting the beams.
Detailed Description
Example 1
The embodiment is suitable for the field of construction of the underground excavated tunnel by the double-side-wall pit guiding method.
A kind of multiple variable cross section subsurface tunnel two-lining fast construction structure, including form moving support and partition wall, the form moves the quantity of the support at least 2, is used for the support and fixation of the two lining forms 4; the template moving support comprises an arch frame 1 and a temporary inverted arch support 2; the arch 1 comprises an arch support 11, a vertical column 12, a cross beam 13 and an arch wall arch 14, one end of the arch support 1 is fixedly connected with the second lining template 4, and the other end is fixedly connected with the vertical column 12; the other end of the upright post 12 is fixedly connected with the top end of the cross beam 13; the bottom end of the cross beam 13 is fixedly connected with the top end of the temporary inverted arch support 2; one end of an arch wall arch center 14 is fixedly connected with the second lining template 4, and the other end of the arch wall arch center is fixedly connected with a temporary inverted arch support 11; the arch part bracket 11 is fixedly connected with an arch wall arch center 14 in a mode of mechanical connection such as hinge, bolt connection or welding, preferably in a hinged mode; a connecting beam 9 is arranged between the cross beams 13 of each template moving support; the partition walls comprise longitudinal partition walls 7 and transverse partition walls, and when the movable formwork support is assembled, the longitudinal partition walls 7 corresponding to the height of the arch center 1 are disassembled; the detached longitudinal partition wall 7 is provided with a track 8, the track 8 comprises a supporting frame 81 and a sliding wheel 82, the supporting frame 81 is fixedly connected to the detached longitudinal partition wall 7, and the sliding wheel 82 is fixedly connected to the supporting frame 81; the sliding wheel 82 is in sliding fit with the connecting beam 9 and used for dragging the whole arch center 1 to the next section of the second lining by using an electric hoist or a chain block according to the weight of the arch center after the second lining 3 is poured; the upright columns 12 and the cross beams 13 are provided with different specifications and sizes and are used for being selected according to the size requirements of the variable-section tunnel secondary lining template 4 and the arch frame 1.
In this embodiment, the two lining forms are standard steel forms of 300mm (width) × 1500mm (length) × 55mm (total thickness), the thickness of the plate surface is 2.75mm, the forms are connected by U-shaped buckles and bolts, and the forms and the arch frames are fastened and fixed by pins or wires.
In the embodiment, each arch 1 is formed by splicing 7 arch rings, 1 beam 13 and 4 upright posts 12, the 7 arch rings of the arch part are hinged by pins to form the arch 1, and the arch part support 11 is formed by 3 arch rings at the top and is bolted with the beam 13 and the upright posts 12 into a whole. The other 4 arch rings form an arch wall arch center 14.
The temporary inverted arch support comprises a temporary inverted arch lower support and a temporary inverted arch upper support, the temporary inverted arch lower support and the temporary inverted arch upper support comprise vertical rods, longitudinal horizontal rods, longitudinal floor sweeping rods and transverse floor sweeping rods, and the bottom of the vertical rod 22 is provided with a fixed seat for fixing the vertical rod 22 to the inverted arch; the longitudinal floor sweeping rod is fixed on the vertical rod at the bottom of the fixed seat, which is not more than 200mm, by adopting a right-angle fastener; the transverse sweeping rod is fixed on the vertical rod which is close to the lower part of the longitudinal sweeping rod by a right-angle fastener; the top end of the upright post 22 is provided with a jacking used for fixedly connecting the cross beam 13 with the upright post 22; the arch wall arch center 14 is fixedly connected with two ends of the horizontal rod 21. The temporary inverted arch support adopts a fastener type scaffold with the diameter of 48.3mm and the wall thickness of 3.6mm, and upright rods are arranged at the interval of 900 multiplied by 750mm and the step pitch of 900mm and are used for supporting the arch support; the outer side and the inner side of the temporary inverted arch support span every 5m longitudinally and transversely and are not less than 3m, vertical cross braces are continuously arranged from bottom to top, and the bottom ends of cross brace rod pieces are tightly propped against the ground; the included angle between the diagonal 23 of the scissor brace and the ground is 45-60 degrees, and each span of the diagonal 23 is buckled with the vertical rod 22; a horizontal bridging should be arranged on the intersection point plane at the top of the vertical bridging, a horizontal bridging should be arranged on the floor sweeping rod, and the vertical or horizontal included angle between the horizontal bridging and the temporary inverted arch support should be 45-60 degrees.
The longitudinal horizontal rods are lengthened by adopting butt fasteners, and joints of two adjacent longitudinal horizontal rods are not arranged in a synchronous or same span; the staggered distance in the horizontal direction between two adjacent joints which are not synchronous or different is not less than 500 mm; the distance from the center of each joint to the nearest main node is not greater than 1/3 of the longitudinal distance; the distance from the joint to the vertical rod is not more than 300 mm; vertical horizontal pole adopts the overlap joint, and wherein overlap joint length is no less than 1000mm, and the overlap joint sets up 3 rotatory fasteners fixed, and rotatory fastener apron edge is not less than 100mm to the rod end of overlap joint pole.
The arch center 11 is made of materials which need to be combined with the section size of a secondary lining of the tunnel and construction working conditions for structural design, in the embodiment, an arch part support 11 and an arch wall arch center 14 are pre-bent into sections by adopting an I18I-steel ground surface cold bending machine, and the inner part of a hole is spliced into a truss; the upright posts 12 and the cross beams 13 are made of I14I-shaped steel and are arranged horizontally according to the horizontal spacing and the jacking position of the scaffold, and the longitudinal spacing is arranged according to the longitudinal spacing of the scaffold of 750 mm. Wherein, the vertical supporting point interval of the upright post 12 is 750mm, and the transverse interval is 900 mm.
In the embodiment, the full hall scaffold adopts a bracket system consisting of a bottom support, a specification phi 48.3 multiplied by 3.6 steel pipe, a fastener and a top support, and the vertical rods 22 are arranged at a spacing of 900 multiplied by 750mm and at a step pitch of 900 mm.
In this embodiment, the use of construction is permitted after the primary support 5 is stabilized, and concrete of the secondary lining 3 is poured between the secondary lining form 4 and the primary support 5.
The application method of the embodiment comprises the following steps: when the upper support of the temporary inverted arch in the movable support of the formworks is used, the top of a longitudinal partition wall matched with the arch 1 is removed according to the sizes of the arch 1 and the second lining formwork 4, the distance is 2.4m in the embodiment, a rail 8 is arranged on the removed longitudinal partition wall 7, a sliding wheel 82 of the rail 8 is coated with lubricating oil and is in sliding fit with a connecting beam 9, and after the second lining 3 is poured, an electric hoist or a chain block is adopted to pull the whole arch 1 to slide to the next section of second lining 3 through the sliding rail 8.
A quick construction method for secondary linings of various variable-section subsurface tunnels comprises the following steps:
s10, constructing an inverted arch, and after the excavation of the tunnel at the underground excavation section of the parking line is finished and the primary support is stable, constructing the inverted arch;
the inverted arch construction comprises the following steps:
s11, according to the monitoring condition, breaking the 2.2m high temporary middle partition concrete at the inverted arch part of the first section of the second lining section;
s12, removing temporary supports at intervals of trusses, and paving an inverted arch waterproof plate and a protective layer;
s13, after the waterproof construction of the inverted arch below the removed support is finished, removing the rest supports, simultaneously recovering the removed support at intervals, and then performing the waterproof construction below the post-removal support;
s14, ensuring the completeness of inverted arch waterproofing on the premise of meeting construction safety; binding inverted arch reinforcing steel bars according to design requirements, installing a template, pouring inverted arch concrete, reserving joints of the reinforcing steel bars and the waterproof plate at the arch wall, and pouring inverted arch backfill concrete after the strength of the inverted arch concrete meets the requirements.
S20, erecting full scaffolds below the temporary inverted arches and dismantling the temporary inverted arches at the arch walls;
s30, building a full scaffold above the temporary inverted arch and dismantling the temporary inverted arch at the arch crown;
the erection of the full scaffold below the temporary inverted arch and the dismantling of the temporary inverted arch at the arch wall in the step S20, and the erection of the full scaffold above the temporary inverted arch and the dismantling of the temporary inverted arch at the arch crown in the step S30 meet the following requirements:
s21, after the construction of the inverted arch is completed, erecting a full red scaffold at the lower part of the temporary inverted arch, wherein the bracket adopts a fastener type scaffold with the diameter of 48.3mm and the wall thickness of 3.6mm, the arrangement distance of upright rods is 900 multiplied by 750mm, and the step pitch is 900 mm;
s22, a fixed base is arranged at the bottom of each upright, and the scaffold is required to be provided with a longitudinal rod and a transverse rod; wherein, the longitudinal floor sweeping rod is fixed on the vertical rod which is not more than 200mm away from the bottom of the steel pipe by adopting a right-angle fastener, and the transverse floor sweeping rod is fixed on the vertical rod which is close to the lower part of the longitudinal floor sweeping rod by adopting the right-angle fastener;
s23, when the longitudinal horizontal rod is connected, a butt fastener is adopted for connection; the joints of two adjacent longitudinal horizontal rods are not arranged in a synchronous or same span; the staggered distance in the horizontal direction between two adjacent joints which are not synchronous or different is not less than 500 mm; the distance from the center of each joint to the nearest main node is not greater than 1/3 of the longitudinal distance; the distance from the joint to the vertical rod is not more than 300 mm; if the longitudinal horizontal rods are in lap joint, the lap joint length is not less than 1000mm, 3 rotary fasteners are arranged for fixation in the lap joint mode, and the distance from the edge of a cover plate of each rotary fastener to the rod end of each lap joint rod is not less than 100 mm;
s24, the formwork support belongs to a full reinforced scaffold, vertical cross braces are continuously arranged from bottom to top every 5 spans at the outer side and the inner side of the formwork support longitudinally and transversely and are not less than 3m, and the bottom ends of cross brace rod pieces are tightly propped against the ground; the included angle between the diagonal rods of the scissor supports and the ground is 45-60 degrees, and each span of the diagonal rods is buckled with the vertical rod; a horizontal scissor support is arranged on the plane of an intersection point of the top of the vertical scissor support, a horizontal scissor support is arranged on the floor sweeping rod, and the vertical or horizontal included angle between the horizontal scissor support and the support is 45-60 degrees;
s25, after the scaffold at the lower part of the temporary inverted arch is erected, longitudinally and sectionally dismantling the temporary inverted arch with the width of 1.6m according to the monitoring condition, and cutting the supporting I-steel;
s26, erecting a temporary inverted arch upper full-hall red scaffold, wherein the support structure requirement is the same as that of erecting a temporary inverted arch lower full-hall red scaffold; and after the erection is finished, longitudinally and sectionally removing the temporary intermediate walls with the height of 2.4m according to the monitoring condition, and cutting the supporting I-steel.
S40, erecting a template moving support, wherein the template moving support comprises an arch frame and a temporary inverted arch support; mounting a second lining template; the method comprises the following steps and requirements that a movable arch frame is built, and a movable support template is installed:
s41, after the full red scaffolds at the lower part and the upper part of the temporary inverted arch are erected, temporarily supporting and dismantling the arch crown and the arch wall within the range of the second lining, paving the integral waterproof board of the arch wall, and binding the reinforcing steel bars of the arch wall;
s42, erecting a second lining arch center during movement, wherein the arch center is pre-bent into sections by adopting an I18I-steel ground surface cold bending machine, and the inner parts of the holes are spliced into roof trusses; the longitudinal beams are I14I-shaped steel and are transversely arranged according to the horizontal spacing of 900mm of the scaffold and the jacking position, and the longitudinal spacing is arranged according to the longitudinal spacing of 750mm of the scaffold; when the arch centering device is installed, the upright rods are used for fixing the arch centering of the arch part, and then the horizontal rods are used for tightly propping and fixing the arch centering of the arch wall; the outer arch rings of the bracket are connected by pins, and the ends of the arch frames are provided with single and double pin ear plates at intervals; the arch rings and the vertical chords are connected through welding connecting plates, the vertical chords are connected with the lower horizontal rods through high-strength bolts, girder longitudinal beams are arranged on the lower portions of the horizontal chords, the longitudinal beams are 100mm multiplied by 100mm, the distance between longitudinal supporting points is 750mm, the distance between transverse supporting points is 900mm, and the longitudinal beams form a supporting system through top supports and frame pipes;
s43, assembling the arch wall template by adopting a Q235 steel template, wherein the length multiplied by the width of the steel template specification is 1500 multiplied by 300mm, 1500 multiplied by 200mm and 1500 multiplied by 100 mm; the surface of the arch wall template can not be uneven, and the flatness and the specification must be constructed according to the requirements. When the steel templates are assembled, the ribs of the adjacent templates are connected by U-shaped cards, the distance is not more than 200mm, and the U-shaped cards are alternately installed in the positive and negative directions; the longitudinal joints of the steel templates are connected by an L-shaped bolt;
s44, the plug template is a wood template, a wood board or a rapid closing gateway template, a square wood or steel pipe is used for backing the template for molding, a phi 18 steel bar is welded on the longitudinal distribution ribs for inward pulling and fixing, the diagonal brace is combined with the diagonal brace of the square wood, the steel pipe or the wood board for supporting and strengthening firmly, the angle of the diagonal brace is not more than 45 degrees, and the gap is blocked by cotton yarn after the template is closed.
S50, pouring secondary lining concrete;
s51, the concrete pouring should be continuously performed. When the interval is necessary, the interval time is preferably shortened, and the secondary concrete is poured before the initial setting of the front concrete. If the construction joint is kept according to the relevant waterproof requirement, the concrete exposed surface is reduced by adopting a pouring method of 'one-slope, thin-layer pouring, sequential propulsion and one-time in-place', the pouring strength is increased to shorten the pouring time and other measures are adopted to prevent the generation of pouring cold joints, and the anti-cracking and anti-permeability capability of the structural concrete is improved.
And S52, reserving 300mm multiplied by 300mm pouring and vibrating holes on the side wall template, uniformly pouring layer by layer through the pouring holes, cleaning residual concrete on the pouring hole cover and the pouring side of the surrounding template when the pouring surface is close to the lower edge of the pouring hole, closing the pouring holes, and ensuring that the pouring holes are tightly and smoothly sealed.
S53, pouring the side wall concrete must be conducted in a layered and symmetrical mode, the symmetrical pouring height is not more than 0.5m, the pouring speed should be controlled to be 0.5m/h, the template is symmetrical and stressed evenly, deformation and displacement of the template are avoided, and accuracy of the structure size is guaranteed. The hose is arranged at the foremost end of the concrete conveying pipeline to ensure that the concrete is directly conveyed to a pouring surface, the self-falling height of the concrete is not more than 2.0m, and stones are prevented from being accumulated to influence the concrete quality. And tamping concrete at the lower part of the lining wall by adopting an overlong tamping rod.
And S54, during pouring, paying attention to the reinforced tamping at the joint. If water is accumulated on the top surface of the concrete, the water is drained and the concrete can be continuously poured.
S60, removing the second lining template; the requirements for removing the second lining template are as follows: the strength of the two-lining concrete ensures that the surface and the edges of the structural member are not damaged by dismantling the template, and the strength reaches more than 8 MPa.
S70, moving the arch forward; installing a track above the temporary support, and after pouring of the second lining of each section is finished, drawing the whole arch center to the next section by using an electric hoist or a chain block to pour concrete of the next section;
and S80, finishing the construction of the second liner, and removing the temporary support. And after the construction of the full-section two-lining arch wall of the parking line is finished, sequentially removing the support systems and uniformly removing the rest temporary supports.
In other embodiments, the scaffold at the variable section is provided with: the structure becomes section department support and sets up interval 900X 750mm, and step pitch 900mm lays the interval according to general construction section scaffold, meets and becomes section department scaffold frame pole setting apart from the end mould when being greater than 300mm, sets up the down tube in end cap department, strengthens end mould atress system. The bottom of the diagonal rod is provided with a pre-buried rib, a triangular square wood with the size of 100 multiplied by 100mm is placed on the pre-buried rib, and the tail end of the scaffold is fixed on the inverted arch backfill concrete, so that the bearing is guaranteed to be stressed stably.
In other embodiments, the arch and the template are arranged when the section is changed: when the movable formwork frame system is used for carrying out second lining construction on different sections, if the size difference of the two sections is large, the movable formwork frame system is moved from the front section to the rear section, and the size of the formwork frame is ensured to meet the requirement by adopting a method of replacing a support vertical rod and a support cross rod with proper sizes; if the section difference is small, a special-shaped wood mold is directly arranged at the corresponding position on the arch ring to finely adjust the size of the section of the mold frame.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any slight modifications, equivalent changes and modifications made by the technical spirit of the present invention to the above embodiments are all within the scope of the technical solution of the present invention.
Claims (5)
1. A multi-variable-section underground tunnel secondary lining rapid construction structure is characterized by comprising template moving supports and partition walls, wherein the number of the template moving supports is at least 2, and the template moving supports are used for supporting and fixing secondary lining templates; the template moving support comprises an arch frame and a temporary inverted arch support; the arch center comprises an arch support, a stand column, a cross beam and an arch wall arch center, wherein one end of the arch support is fixedly connected with the two lining templates, and the other end of the arch support is fixedly connected with the stand column; the other end of the upright post is fixedly connected to the top end of the cross beam; the bottom end of the cross beam is fixedly connected with the top end of the support at the temporary inverted arch; one end of the arch wall arch frame is fixedly connected with the two lining templates, and the other end of the arch wall arch frame is fixedly connected with the temporary inverted arch support; the arch part support is fixedly connected with the arch frame of the arch wall; a connecting beam is arranged between the cross beams of each template moving support; the partition walls comprise longitudinal partition walls and transverse partition walls, and when the template moving support is assembled, the longitudinal partition walls corresponding to the height of the arch center are disassembled; a rail is arranged on the dismantled longitudinal partition wall, the rail comprises a support frame and a sliding wheel, the support frame is fixedly connected to the dismantled longitudinal partition wall, and the sliding wheel is fixedly connected to the support frame; the sliding wheel is in sliding fit with the connecting beam and used for dragging the whole arch centering to a next section of second lining by using an electric hoist or a chain block according to the weight of the arch centering after the second lining is poured; the upright columns and the cross beams are provided with different specifications and sizes and are used for being selected according to the requirements of variable cross section tunnel secondary lining templates and the size of the arch frame.
2. The double-lining rapid construction structure according to claim 1, wherein the temporary inverted arch support comprises a temporary inverted arch lower support and a temporary inverted arch upper support, the temporary inverted arch lower support and the temporary inverted arch upper support comprise a vertical rod, a longitudinal horizontal rod, a longitudinal floor sweeping rod and a transverse floor sweeping rod, and a fixing seat is arranged at the bottom of the vertical rod for fixing the vertical rod to the inverted arch; the longitudinal floor sweeping rod is fixed on the vertical rod at the bottom of the fixed seat, which is not more than 200mm, by adopting a right-angle fastener; the transverse sweeping rod is fixed on the vertical rod which is close to the lower part of the longitudinal sweeping rod by adopting a right-angle fastener; the top end of the upright stanchion is provided with a jacking used for fixedly connecting the cross beam with the upright stanchion; the arch wall arch center is fixedly connected with the horizontal rod.
3. The two-lining rapid construction structure according to claim 2, wherein the temporary inverted arch support is a fastener type scaffold, and the arrangement distance between the vertical rods is 900 x 750mm, and the step pitch is 900mm, so as to support the arch; the outer side and the inner side of the temporary inverted arch support are longitudinally and transversely arranged at intervals of 5m and not less than 3m, vertical cross braces are continuously arranged from bottom to top, and the bottom end of each cross brace rod piece is tightly propped against the ground; the included angle between the diagonal rods of the cross braces and the ground is 45-60 degrees, and each span of the diagonal rods is buckled with the vertical rod; a horizontal bridging should be arranged on the plane of the top intersection point of the vertical bridging, a horizontal bridging should be arranged on the floor sweeping rod, and the vertical or horizontal included angle between the horizontal bridging and the temporary inverted arch support should be 45-60 degrees.
4. The two-lining rapid construction structure according to claim 3, wherein the longitudinal horizontal rods are lengthened by adopting a butt-joint fastener, and joints of two adjacent longitudinal horizontal rods are not arranged in a synchronous or same span; the staggered distance in the horizontal direction between two adjacent joints which are not synchronous or different is not less than 500 mm; the distance from the center of each joint to the nearest main node is not greater than 1/3 of the longitudinal distance; the distance from the joint to the vertical rod is not more than 300 mm; vertical horizontal pole adopts the overlap joint, and wherein overlap joint length is no less than 1000mm, and the overlap joint sets up 3 rotatory fasteners fixed, and rotatory fastener apron edge is not less than 100mm to the rod end of overlap joint pole.
5. A two-lining rapid construction structure according to claim 4, wherein the arch support and the arch wall arch are prebent into sections by an I18I-steel ground surface cold bending machine, and the roof truss is assembled in the hole; the upright posts and the cross beams are made of I14I-shaped steel and are arranged horizontally according to the horizontal spacing and the jacking position of the scaffold, and the longitudinal spacing is arranged according to the longitudinal spacing 750mm of the scaffold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020400096.1U CN212003212U (en) | 2020-03-26 | 2020-03-26 | Two lining quick construction structures in multiple variable cross section undercut tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020400096.1U CN212003212U (en) | 2020-03-26 | 2020-03-26 | Two lining quick construction structures in multiple variable cross section undercut tunnel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212003212U true CN212003212U (en) | 2020-11-24 |
Family
ID=73422849
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020400096.1U Active CN212003212U (en) | 2020-03-26 | 2020-03-26 | Two lining quick construction structures in multiple variable cross section undercut tunnel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212003212U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111271092A (en) * | 2020-03-26 | 2020-06-12 | 中铁三局集团第五工程有限公司 | Rapid construction structure and method for secondary lining of variable-section subsurface tunnel |
-
2020
- 2020-03-26 CN CN202020400096.1U patent/CN212003212U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111271092A (en) * | 2020-03-26 | 2020-06-12 | 中铁三局集团第五工程有限公司 | Rapid construction structure and method for secondary lining of variable-section subsurface tunnel |
| WO2021189746A1 (en) * | 2020-03-26 | 2021-09-30 | 中铁三局集团有限公司 | Rapid construction structure and method for secondary lining of multiple variable-cross-section bored tunnels |
| CN111271092B (en) * | 2020-03-26 | 2024-10-25 | 中铁三局集团有限公司 | Quick construction structure and method for multiple variable cross-section undercut tunnel two liners |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111271092B (en) | Quick construction structure and method for multiple variable cross-section undercut tunnel two liners | |
| CN111424570A (en) | Assembly type trolley for box culvert construction and construction method thereof | |
| CN105952482B (en) | Self-propelled tunnel inverted arch lining trolley | |
| CN111941637A (en) | Sectional prefabricating method for immersed tube joint | |
| CN109139049B (en) | Construction method for secondary lining buckling arch of underground excavation station of subway | |
| CN104594204B (en) | Urban light rail viaduct mountain type U beam Construction Supporting System and construction method | |
| CN105401679A (en) | Large-gradient cast-in-place concrete inclined roof construction method | |
| CN106930192B (en) | Assembled variable cross-section contracture sliding mode system and its construction method | |
| CN211947993U (en) | Support for large-span cast-in-situ bridge construction | |
| CN109629439B (en) | Construction method of single-tower cable-stayed bridge | |
| CN109778700B (en) | Cast-in-place trough beam three-point sliding pushing construction method for crossing existing road | |
| CN111455852A (en) | Assembling method of movable formwork for bridge construction | |
| CN112458936A (en) | Construction method for integrally translating box culvert full-hall support | |
| CN212003212U (en) | Two lining quick construction structures in multiple variable cross section undercut tunnel | |
| CN204475184U (en) | Urban light rail viaduct mountain type U beam Construction Supporting System | |
| CN108533283A (en) | A kind of two lining trolley of self-control and its application in repairing impaired tunnel | |
| CN212316712U (en) | Box culvert construction is with assembled platform truck | |
| CN103603490B (en) | Floor slab concrete construction method applying floor slab trolley | |
| CN106013234A (en) | Construction method for underground comprehensive pipe rack | |
| CN110847065A (en) | Prefabricated assembled box channel and construction method | |
| CN217054319U (en) | Single-side formwork side wall concrete pouring template system | |
| CN213235079U (en) | Concrete formwork supporting structure for underground excavation tunnel deformation joint post-cast strip | |
| CN213233106U (en) | Arch ring support | |
| CN205934962U (en) | A system of sliding for underground pipe gallery cast -in -situ construction | |
| CN115387234A (en) | Template system of lower beam of ultrahigh rhombic tower pier and construction method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |