CN111549789A - Reinforcing structure for foundation pit support and construction method thereof - Google Patents
Reinforcing structure for foundation pit support and construction method thereof Download PDFInfo
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- CN111549789A CN111549789A CN202010383856.7A CN202010383856A CN111549789A CN 111549789 A CN111549789 A CN 111549789A CN 202010383856 A CN202010383856 A CN 202010383856A CN 111549789 A CN111549789 A CN 111549789A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
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Abstract
The invention relates to a reinforced structure for foundation pit support and a construction method thereof in the technical field of underground engineering, which comprises a reinforced wall positioned on one side of the foundation pit support facing a foundation pit, and is characterized in that: the reinforced wall is provided with a plurality of horizontally arranged support rods, one end of each support rod, which faces away from the reinforced wall, is fixedly connected with a foundation pit support, a plurality of bearing piles are arranged at the bottom of the reinforced wall, a support crown beam is poured between each bearing pile and the reinforced wall, and a support bottom plate connected with the foundation pit support extends out of one side of the support crown beam, which faces the foundation pit support. The invention has the advantages that the reinforcing wall fixedly connected with the supporting pile always generates an acting force for applying pressure to the soil body around the foundation pit on the foundation pit support, the integrity of the foundation pit support and the reinforcement is improved, the firmness is better, the foundation pit support is not required to be limited by occupying a field outside the foundation pit, and the utilization rate of the foundation pit field is higher.
Description
Technical Field
The invention relates to the technical field of underground engineering, in particular to a reinforcing structure for foundation pit supporting and a construction method thereof.
Background
At present, with the continuous promotion of the process of national urbanization construction, the available space of cities is less and less, and urban real estate developers continuously improve the requirements of underground space development in order to improve the utilization rate of construction land. Therefore, in the foundation pit supporting engineering, a developer often has a requirement of increasing the excavation depth of the foundation pit due to scheme modification, and for the engineering which is not yet carried out by foundation pit supporting, the requirement can be well met by changing the supporting design scheme, but if the foundation pit supporting structure is under construction or the construction is finished, the requirement needs to be solved through other schemes.
In the foundation pit support, the scheme of supporting piles and anchor cables is often adopted, because the scheme is convenient and quick to construct, and sufficient space can be created for foundation pit excavation and basement construction. The foundation pit after traditional supporting structure construction deepens and overedges, and the scheme of adoption is based on supplementing a fender pile and adding the anchor rope.
However, as more and more foundation pit engineering constructions are limited by site conditions, the anchor cable cannot occupy a site outside the foundation pit, and the problem of site limitation is solved by an urgent need for a reinforcing structure for foundation pit supporting.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a reinforcing structure for foundation pit support without occupying a field outside a foundation pit.
The above object of the present invention is achieved by the following technical solutions:
the utility model provides a reinforced structure for excavation supporting, is including being located the back up wall of excavation supporting towards excavation supporting one side, the back up wall is equipped with the bracing piece that a plurality of levels were placed, the bracing piece is back to the one end and the excavation supporting fixed connection of back up wall, the back up wall bottom is equipped with a plurality of bearing piles, it has the support hat roof beam to pour into a mould between bearing pile and the back up wall, it stretches out towards excavation supporting one side and has the supporting baseplate who is connected with excavation supporting to support hat roof beam.
Through adopting above-mentioned technical scheme, make and prop stake fixed connection's reinforced wall and produce an effort of exerting pressure to the foundation ditch soil body all the time to excavation supporting, improve excavation supporting and consolidate strong wholeness, the fastness is better, need not to occupy the place outside the foundation ditch and carries on spacingly to excavation supporting, and the utilization ratio in foundation ditch place is higher.
The present invention in a preferred example may be further configured to: and one end of the supporting crown beam, which is back to the foundation pit support, is provided with a plurality of restraining beams vertical to the supporting crown beam.
By adopting the technical scheme, the restraining beam is connected with the building in the foundation pit at the periphery of the foundation pit support through the arrangement of the restraining beam, the supporting crown beam disperses the reverse acting force generated by the foundation pit support to the pile foundation of the building in the foundation pit, and the reinforced wall has stronger bearing capacity and is not easy to be damaged by force.
The present invention in a preferred example may be further configured to: the supporting bottom plate is provided with a plurality of anchoring nails at one end back to the supporting crown beam, a plurality of anchoring rings are anchored at one end of the reinforcing wall facing the foundation pit support, and fastening rods are connected between the anchoring nails and the anchoring rings.
Through adopting above-mentioned technical scheme, make the anchor nail that is located supporting baseplate exert an oblique pulling force towards excavation supporting to the reinforced wall, and because the effect of bracing piece for the bracing piece pole exerts the effort of level orientation excavation supporting to excavation supporting, and the reinforced wall plays the constraint effect to excavation supporting promptly, and excavation supporting is difficult for producing deformation because of foundation ditch outlying soil body pressure.
The present invention in a preferred example may be further configured to: the foundation ditch is strutted towards one side of reinforcing wall and is fixed with the waist rail of strutting that the level was placed, and one side that the waist rail was strutted towards the reinforcing wall is equipped with and struts the waist rail and correspond with the support waist rail of strutting, strut the waist rail and support the waist rail and be opened U type open-ended U type channel bar, and strut the waist rail and support the U type opening of waist rail and correspond each other, the one end of bracing piece is fixed in the U type opening of strutting the waist rail and the other end is contradicted in the U type opening of supporting the waist rail.
By adopting the technical scheme, when the soil body outside the foundation pit generates positive or negative soil body pressure on the foundation pit support, deformation allowance is left between the foundation pit support and the reinforcing wall, or when workers generate certain pressure change on the reinforcing wall in the construction process, the reinforcing wall is not easy to drive the foundation pit support to move simultaneously, the waist beam and the support waist beam are arranged, so that the force application of the reinforcing wall on the foundation pit support is balanced, and the damage of stress concentration on the foundation pit support and the reinforcing wall is reduced.
The present invention in a preferred example may be further configured to: and one end of the reinforcing wall, which faces away from the foundation pit support, is provided with a plurality of restraint auxiliary beams.
By adopting the technical scheme, the auxiliary restraining beam is connected with the building in the foundation pit at the periphery of the foundation pit support through the auxiliary restraining beam, the auxiliary restraining beam disperses the reverse acting force generated by the foundation pit support to the bearing structure of the building in the foundation pit, and the reinforcing wall is high in bearing capacity and not prone to stress damage.
The present invention in a preferred example may be further configured to: and backfill soil is filled between the reinforced wall and the foundation pit support.
By adopting the technical scheme, the force transmission path between the structures is increased, so that the load between the rotary excavating pile supporting wall and the permanent supporting structure wall is uniformly distributed, larger stress concentration is not easy to generate, and the firmness is better.
A construction method using any one of the reinforcement structures for foundation pit support comprises the following steps:
s1, after the foundation pit supporting construction is finished, workers carry out reinforced concrete supporting construction in the process of foundation pit excavation, and sequentially construct a plurality of reinforced concrete supports to the designed elevation of the foundation pit, so that two ends of each reinforced concrete support are abutted against the foundation pit supporting, and the reinforced concrete supports generate an acting force which always faces back to the center of the foundation pit for the foundation pit supporting;
s2, constructing the bottom of the foundation pit, rotary excavating a bearing pile at the bottom of the foundation pit, pouring a supporting crown beam at the top end of the bearing pile, and synchronously constructing other buildings in the foundation pit;
s3, constructing a supporting base plate, wherein a reserved steel bar is reserved at one end, facing a foundation pit support, of a supporting top beam, a supporting base plate fixedly connected with the supporting top beam and the foundation pit support is poured by workers between the supporting top beam and the foundation pit support, a planting bar is reserved at one end, facing away from the foundation pit support, of the supporting top beam, and a plurality of horizontally-arranged restraining beams are poured by the workers between base plates of other buildings in the foundation pit and the supporting top beam; in the process of pouring the supporting base plate, a worker uniformly embeds a plurality of uniformly distributed anchoring nails at one end of the supporting base plate, which is opposite to the supporting crown beam, and the anchoring nails are fixedly connected with reinforcing steel bars embedded in the supporting base plate;
s4, pouring the reinforced wall, wherein workers pour the reinforced wall on the supporting crown beam to the lowest reinforced concrete supporting height to enable the fastening rods to be fixedly connected with the anchoring nails, then adjust the angles of the fastening rods, and fill backfill between the reinforced wall and the foundation pit support;
s5, supporting rods are applied, when the reinforcing wall is applied to a preset elevation, a worker respectively fixes a horizontally-placed U-shaped channel steel on the corresponding side surface of the foundation pit support and the reinforcing wall to form a support waist beam and a support waist beam, at the moment, a plurality of supporting rods are inserted between the support waist beam and the support waist beam, after the positions of the supporting rods are determined, the worker welds one ends of the supporting rods into the support waist beam and welds baffles into the support waist beam, and the baffles are positioned on two sides of the supporting rods in the length direction and abut against the supporting rods;
s6, in the process of heightening the reinforced wall, workers synchronously construct other buildings in the foundation pit, meanwhile, a restraint auxiliary beam is connected between the reinforced wall and a supporting beam or a bearing wall of the building, and after the restraint auxiliary beam is fixed, the workers remove the corresponding reinforced concrete support;
s7, repeating the step S5, heightening the reinforced wall to a designed elevation, gradually removing the reinforced concrete supports from bottom to top, and additionally arranging corresponding support rods between the reinforced wall and the foundation pit support;
s8, when the reinforced wall is heightened to the actual elevation of the anchoring ring, the anchoring ring is installed, and a worker fixedly connects the fastening rod with the anchoring ring; finally, backfilling soil is filled and compacted.
Through adopting above-mentioned technical scheme, make the reinforced wall produce the effort of exerting pressure to the foundation ditch soil body all the time to the foundation ditch support, need not to occupy the place outside the foundation ditch and carry on spacingly to the foundation ditch support, the utilization ratio in foundation ditch place is higher, and the work progress is simple, reduces the waste of a large amount of materials, and construction period is shorter, and construction cost is lower.
The present invention in a preferred example may be further configured to: the reinforced concrete supports comprise a first support, a second support and a third support, and the first support is constructed after the foundation pit is excavated downwards to the bottom of the first support; after the strength of the first support reaches the design strength, continuously excavating the foundation pit to the bottom of a second support, and constructing a second support; constructing a third support in sequence until the third support is excavated to the bottom of the foundation pit; when the reinforced concrete support is dismantled, after the supporting bottom plate and the constraint beams at the bottom of the reinforced wall reach the designed strength, the third support is dismantled, and after the reinforced wall and the corresponding constraint auxiliary beams reach the designed strength, the second support and the third support are dismantled in sequence.
By adopting the technical scheme, in the construction process of the reinforced wall, the foundation pit support is not easy to generate extrusion deformation due to the removal of the reinforced concrete supports, so that the firmness of the foundation pit support is better.
In summary, the invention includes at least one of the following beneficial technical effects:
1. make and support stake fixed connection's reinforced wall produce the effort of exerting pressure to the foundation ditch soil body all the time to the foundation ditch support, improve foundation ditch support and consolidate strong wholeness, the fastness is better, need not to occupy the place outside the foundation ditch and carry on spacingly to the foundation ditch support, and the utilization ratio in foundation ditch place is higher. (ii) a
2. The anchor nails on the supporting base plate apply an oblique pulling force towards the foundation pit support to the reinforcing wall, and the supporting rods apply an action force horizontally towards the foundation pit support to the foundation pit support due to the action of the supporting rods, namely the reinforcing wall plays a role in restraining the foundation pit support, and the foundation pit support is not easy to deform due to the pressure of the soil body on the periphery of the foundation pit. (ii) a
3. The reinforcing wall always generates an acting force applied to the soil body around the foundation pit for foundation pit support, the foundation pit support is not limited by occupying a field outside the foundation pit, the utilization rate of the foundation pit field is high, the construction process is simple, the waste of a large amount of materials is reduced, the construction period is short, and the construction cost is low.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
In the figure, 1, supporting a foundation pit; 2. reinforcing the wall; 21. a support bar; 3. carrying piles; 31. supporting the crown beam; 11. supporting a crown beam; 4. a support base plate; 22. a restraint beam; 23. restraining the secondary beam; 41. anchoring nails; 42. an anchoring ring; 43. a fastening rod; 12. supporting a waist rail; 24. and supporting the wale.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the reinforcing structure for a foundation pit support 1 disclosed by the invention comprises a reinforcing wall 2, bearing piles 3 and supporting crown beams 31, wherein the bearing piles 3 and the supporting crown beams 31 are used for supporting the reinforcing wall 2, the reinforcing wall 2 is horizontally and vertically arranged on one side, facing the center of a foundation pit, of the foundation pit support 1, the bearing piles 3 are provided with a plurality of bearing piles and are arranged below the reinforcing wall 2, the reinforcing wall 2 is connected with the bearing piles 3 through the supporting crown beams 31, and concrete is poured among the bearing piles 3, the supporting crown beams 31 and the reinforcing wall 2, and mutually connected reinforcing steel bars are buried among the bearing piles, the supporting crown beams 31 and.
One side of the supporting crown beam 31 facing the foundation pit support 1 extends out of a supporting base plate 4 connected with the foundation pit support 1, reinforcing steel bars connected with the supporting crown beam 31 and the foundation pit support 1 are matched in the supporting base plate 4, and the reinforcing steel bars are not shown in the figure.
A plurality of horizontally arranged supporting waist beams 12 are arranged on one side of the foundation pit support 1 facing the reinforced wall 2, a plurality of supporting waist beams 24 corresponding to the supporting waist beams 12 are arranged on one side of the reinforced wall 2 facing the foundation pit support 1, the supporting waist beams 24 and the supporting waist beams 12 are U-shaped channel steel with U-shaped openings, the supporting waist beams 24 correspond to the U-shaped openings of the supporting waist beams 12, planting bars are arranged at the positions of the foundation pit support 1 and the reinforced wall 2 corresponding to the U-shaped channel steel, the reinforcing wall 2 and the foundation pit support 1 are internally provided with the distributing bars, the U-shaped channel steel is fixedly connected with the foundation pit support 1 and the reinforced wall 2 through the corresponding planting bars respectively, a supporting crown beam 11 is generally arranged at the top end of the foundation pit support 1, the end surface of the reinforced wall 2, which is opposite to the bottom of the foundation pit, is as high as the supporting crown beam 11, the horizontally arranged reinforcing waist beam 12 is also arranged on the crown beam 11 facing the reinforced wall 2, and the supporting waist beam 24 corresponding to the;
As shown in fig. 1, one end of the supporting crown beam 31 facing away from the foundation pit support 1 is provided with a plurality of restraining beams 22 perpendicular to the supporting crown beam 31, the restraining beams 22 are connected with the buildings in the foundation pit around the foundation pit support 1 through the arrangement of the restraining beams 22, and the supporting crown beam 31 disperses the reverse acting force generated by the foundation pit support 1 to the pile foundations of the buildings in the foundation pit. One end of the reinforcing wall 2, which faces away from the foundation pit support 1, is fixed with a plurality of vertically arranged channel steel, a restraint secondary beam 23 which is horizontally arranged and is parallel to the restraint beam 22 is arranged in the channel steel, the length of the restraint secondary beam 23 is indefinite, and the restraint secondary beam and a bearing structure of a building around the foundation pit are arranged.
A plurality of anchoring nails 41 are installed at one end of the supporting bottom plate 4, which is opposite to the supporting crown beam 31, a plurality of anchoring rings 42 are anchored at one end of the reinforcing wall 2, which faces the foundation pit support 1, a fastening rod 43 is connected between the anchoring nails 41 and the anchoring rings 42, backfill soil is backfilled between the foundation pit support 1 and the reinforcing wall 2, the backfill soil is compacted in layers, the backfill soil can be selected from in-situ soil generated in the foundation pit excavation process or building residues generated in the foundation pit excavation process, and for convenience of explanation, the backfill soil and the foundation pit are shown in the figure.
As shown in fig. 1, a construction method of a reinforcing structure using the above-described foundation pit support 1 includes the steps of:
s1, after the foundation pit support 1 is constructed, workers carry out reinforced concrete support construction in the process of foundation pit excavation, and sequentially construct a plurality of reinforced concrete supports to the designed elevation of the foundation pit, so that two ends of each reinforced concrete support are abutted against the foundation pit support 1, and the reinforced concrete supports generate an acting force which always faces back to the center of the foundation pit on the foundation pit support 1; the reinforced concrete supports comprise a first support, a second support and a third support, and the first support is constructed after the foundation pit is excavated downwards to the bottom of the first support; after the strength of the first support reaches the design strength, continuously excavating the foundation pit to the bottom of a second support, and constructing a second support; constructing a third support in sequence until the third support is excavated to the bottom of the foundation pit;
s2, constructing the bottom of the foundation pit, rotationally excavating the bearing pile 3 at the bottom of the foundation pit, pouring the supporting crown beam 31 at the top end of the bearing pile 3, and synchronously constructing other buildings in the foundation pit;
s3, constructing a supporting base plate 4, reserving a reserved steel bar at one end of the supporting top beam 31 facing the foundation pit support 1, pouring a supporting base plate 4 fixedly connected with the supporting top beam 31 and the foundation pit support 1 by a worker, reserving a planting steel bar at one end of the supporting top beam 31 back to the foundation pit support 1, and pouring a plurality of horizontally-arranged restraining beams 22 between the supporting top beam 31 and other building base plates in the foundation pit by the worker; in the pouring process of the supporting base plate 4, a worker uniformly embeds a plurality of uniformly distributed anchoring nails 41 at one end of the supporting base plate 4, which is opposite to the supporting crown beam 31, and the anchoring nails 41 are fixedly connected with reinforcing steel bars embedded in the supporting base plate 4;
s4, pouring the reinforced wall 2 on the supporting crown beam 31 to the lowest reinforced concrete support height by workers, enabling the fastening rods 43 to be fixedly connected with the anchoring nails 41, then adjusting the angles of the fastening rods 43, and filling backfill between the reinforced wall 2 and the foundation pit support 1; the problem that the angle is not easy to adjust when the fastening rod 43 is connected with the anchoring ring 42 due to the fact that extrusion force is generated on the fastening rod 43 in the backfill filling process is solved;
s5, performing supporting rods 21, when the reinforcing wall 2 is made to a preset elevation, respectively fixing a horizontally-arranged U-shaped channel steel which corresponds to each other on the corresponding side surfaces of the foundation pit support 1 and the reinforcing wall 2 by a worker to form a supporting wale 12 and a supporting wale 24, inserting a plurality of supporting rods 21 between the supporting wale 12 and the supporting wale 24 at the moment, welding one end of each supporting rod 21 into the supporting wale 12 after the position of each supporting rod 21 is determined, welding baffle plates into the supporting wale 24, wherein the baffle plates are positioned on two sides of each supporting rod 21 in the length direction and abut against the supporting rods 21; and (3) after the supporting bottom plate 4 and the restraint beams 22 at the bottom of the reinforced wall 2 are applied to reach the designed strength, removing the third support.
S6, in the process of heightening the reinforcing wall 2, a worker synchronously constructs other buildings in the foundation pit, meanwhile, a restraining secondary beam 23 is connected between the reinforcing wall 2 and a supporting beam or a bearing wall of the building, a vertically placed channel steel is firstly reinforced on one side, opposite to the foundation pit support 1, of the reinforcing wall 2, then one end of the restraining secondary beam 23 is fixed in the channel steel, and after the restraining secondary beam 23 is fixed, the worker removes the corresponding reinforced concrete support;
s6, repeating the step S5, heightening the reinforced wall 2 to a designed elevation, gradually removing the reinforced concrete support from bottom to top, and additionally arranging a corresponding support rod 21 between the reinforced wall 2 and the foundation pit support 1; namely, the second support and the first support are sequentially dismantled; it should be noted that, after the constraint secondary beam 23 with the corresponding height is reinforced, the worker should remove the reinforced concrete support corresponding to the constraint secondary beam 23;
s7, when the reinforced wall 2 is heightened to the actual elevation of the anchoring ring 42, the anchoring ring 42 is installed, and a worker fixedly connects the fastening rod 43 with the anchoring ring 42; finally, backfilling soil is filled and compacted.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (8)
1. The utility model provides a reinforced structure for excavation supporting (1), includes and is located excavation supporting (1) reinforcement wall (2) towards excavation one side, its characterized in that: the reinforced wall (2) is provided with a plurality of horizontally arranged support rods (21), one end of each support rod (21) back to the reinforced wall (2) is fixedly connected with a foundation pit support (1), a plurality of bearing piles (3) are arranged at the bottom of the reinforced wall (2), a support crown beam (31) is poured between each bearing pile (3) and the reinforced wall (2), and a support bottom plate (4) connected with the foundation pit support (1) extends out of one side of the support crown beam (31) facing the foundation pit support (1).
2. The reinforcing structure for an excavation supporting (1) according to claim 1, characterized in that: and one end of the supporting crown beam (31) back to the foundation pit support (1) is provided with a plurality of restraint beams (22) vertical to the supporting crown beam (31).
3. The reinforcing structure for an excavation supporting (1) according to claim 1, characterized in that: a plurality of anchoring nails (41) are installed at one end of the supporting base plate (4) back to the supporting crown beam (31), a plurality of anchoring rings (42) are anchored at one end, facing the foundation pit support (1), of the reinforcing wall (2), and fastening rods (43) are connected between the anchoring nails (41) and the anchoring rings (42).
4. The reinforcing structure for an excavation supporting (1) according to claim 1, characterized in that: excavation supporting (1) are fixed with the support waist rail (12) that the level was placed towards one side of reinforcing wall (2), and one side that waist rail (12) was strutted towards reinforcing wall (2) is equipped with and supports waist rail (24) that waist rail (12) corresponds, it is open with support waist rail (24) and has U type open-ended U type channel bar to strut waist rail (12), and struts waist rail (12) and support the U type opening of waist rail (24) and correspond each other, the one end of bracing piece (21) is fixed in the U type opening of strutting waist rail (12) and the other end is contradicted in the U type opening of supporting waist rail (24).
5. The reinforcing structure for an excavation supporting (1) according to claim 1, characterized in that: and one end of the reinforcing wall (2) back to the foundation pit support (1) is provided with a plurality of restraint auxiliary beams (23).
6. The reinforcing structure for an excavation supporting (1) according to claim 1, characterized in that: and backfill soil is filled between the reinforced wall (2) and the foundation pit support (1).
7. A construction method using the reinforcement structure for an excavation supporting (1) according to any one of claims 1 to 6, comprising the steps of:
s1, after the foundation pit support (1) is constructed, workers carry out reinforced concrete support construction in the process of foundation pit excavation, sequentially construct a plurality of reinforced concrete supports to the designed elevation of the foundation pit, so that two ends of each reinforced concrete support are abutted against the foundation pit support (1), and the reinforced concrete supports generate an acting force which always faces back to the center of the foundation pit on the foundation pit support (1);
s2, constructing the bottom of the foundation pit, namely, digging a bearing pile (3) at the bottom of the foundation pit in a rotary mode, pouring a supporting crown beam (31) at the top end of the bearing pile (3), and synchronously constructing other buildings in the foundation pit;
s3, constructing a supporting base plate (4), reserving a reserved steel bar at one end of a supporting crown beam (31) facing a foundation pit support (1), pouring the supporting base plate (4) fixedly connected with the supporting crown beam (31) and the foundation pit support (1) by a worker, reserving a planting bar at one end of the supporting crown beam (31) back to the foundation pit support (1), and pouring a plurality of horizontally-arranged restraining beams (22) between the supporting crown beam (31) and other building base plates in the foundation pit by the worker; in the pouring process of the supporting base plate (4), a worker uniformly embeds a plurality of uniformly distributed anchoring nails (41) at one end of the supporting base plate (4) back to the supporting crown beam (31), and the anchoring nails (41) are fixedly connected with reinforcing steel bars pre-embedded in the supporting base plate (4);
s4, pouring the reinforced wall (2) to the lowest reinforced concrete support height on the support crown beam (31) by workers, enabling the fastening rods (43) to be fixedly connected with the anchoring nails (41), then adjusting the angles of the fastening rods (43), and filling backfill soil between the reinforced wall (2) and the foundation pit support (1);
s5, supporting rods (21) are constructed, when the reinforcing wall (2) is constructed to a preset elevation, workers respectively fix a horizontally-placed U-shaped channel steel on the corresponding side faces of the foundation pit support (1) and the reinforcing wall (2) to form a supporting waist beam (12) and a supporting waist beam (24), at the moment, a plurality of supporting rods (21) are inserted between the supporting waist beam (12) and the supporting waist beam (24), after the positions of the supporting rods (21) are determined, the workers weld one ends of the supporting rods (21) in the supporting waist beam (12) and weld baffles in the supporting waist beam (24), and the baffles are positioned on the two sides of the supporting rods (21) in the length direction and abut against the supporting rods (21);
s6, in the heightening process of the reinforced wall (2), workers construct other buildings in the foundation pit synchronously, meanwhile, a restraint auxiliary beam (23) is connected between the reinforced wall (2) and a supporting beam or a bearing wall of the building, and after the restraint auxiliary beam (23) is fixed, the workers dismantle corresponding reinforced concrete supports;
s7, repeating the step S5, heightening the reinforced wall (2) to a designed elevation, gradually removing the reinforced concrete support from bottom to top, and additionally arranging a corresponding support rod (21) between the reinforced wall (2) and the foundation pit support (1);
s8, when the reinforced wall (2) is heightened to the actual elevation of the anchoring ring (42), the anchoring ring (42) is installed, and a worker fixedly connects the fastening rod (43) with the anchoring ring (42); finally, backfilling soil is filled and compacted.
8. Construction method of a reinforcement structure for foundation pit support (1) according to claim 7, characterized in that: the reinforced concrete supports comprise a first support, a second support and a third support, and the first support is constructed after the foundation pit is excavated downwards to the bottom of the first support; after the strength of the first support reaches the design strength, continuously excavating the foundation pit to the bottom of a second support, and constructing a second support; constructing a third support in sequence until the third support is excavated to the bottom of the foundation pit; when the reinforced concrete support is dismantled, after the supporting bottom plate (4) and the restraint beams (22) at the bottom of the reinforced wall (2) reach the designed strength, the third support is dismantled, and after the reinforced wall (2) and the corresponding restraint auxiliary beams (23) reach the designed strength, the second support and the third support are dismantled in sequence.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112942368A (en) * | 2021-02-03 | 2021-06-11 | 浙江文华建设项目管理有限公司 | Deep foundation pit construction method with side wall supporting function |
| CN114703869A (en) * | 2022-04-29 | 2022-07-05 | 中国核工业芜湖基础工程有限公司 | Construction process of confined space diagonal bracing in foundation pit support |
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| CN114703869A (en) * | 2022-04-29 | 2022-07-05 | 中国核工业芜湖基础工程有限公司 | Construction process of confined space diagonal bracing in foundation pit support |
| CN114703869B (en) * | 2022-04-29 | 2024-01-26 | 中国核工业芜湖基础工程有限公司 | Construction process of confined space inclined support in foundation pit support |
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Application publication date: 20200818 |