CN114673354A - Construction method of complex curved surface concrete thin shell structure adopting cable mesh fabric template - Google Patents
Construction method of complex curved surface concrete thin shell structure adopting cable mesh fabric template Download PDFInfo
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- CN114673354A CN114673354A CN202210411664.1A CN202210411664A CN114673354A CN 114673354 A CN114673354 A CN 114673354A CN 202210411664 A CN202210411664 A CN 202210411664A CN 114673354 A CN114673354 A CN 114673354A
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- 239000004744 fabric Substances 0.000 title claims abstract description 87
- 238000010276 construction Methods 0.000 title claims abstract description 51
- 239000004567 concrete Substances 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 claims description 15
- 238000003466 welding Methods 0.000 claims description 4
- 238000005457 optimization Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims 1
- 238000005516 engineering process Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 238000005507 spraying Methods 0.000 description 4
- 238000009415 formwork Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/14—Conveying or assembling building elements
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
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Abstract
The invention relates to a construction method of a complex curved surface concrete thin shell structure by adopting a cable mesh fabric template, which comprises the following steps: establishing a cable net boundary and a target curved surface by combining a curved surface form of a structure to be constructed; designing the layout of the cable net; cutting and analyzing the fabric by combining the layout scheme of the cable net; optimizing the layout scheme of the cable net according to the construction load; designing a support frame according to the cable net boundary; erecting a supporting frame at a design position, and installing a cable net to form a cable net structure; laying the cut fabric units on the cable net structure, and connecting the adjacent fabric units to form an integral fabric; tensioning the cable net structure according to the prestress of the cable net; after tensioning is finished, concrete is sprayed on the cable net structure and the fabric layer by layer to form a complex curved surface concrete thin shell structure, and construction is finished. The fabric can transmit construction load to a cable net structure with supporting rigidity, and can be suitable for construction in various complex curved surface forms.
Description
Technical Field
The invention relates to the field of building construction, in particular to a construction method of a complex curved surface concrete thin shell structure adopting a cable mesh fabric template.
Background
The existing traditional wooden template or steel template system is difficult to realize the construction of a complex curved surface, especially a concrete thin shell structure with large curvature and negative Gaussian curvature. The construction technology of the reinforced concrete thin shell structure by the air film method also has two limitations: firstly, the concrete thin shell structure is limited by the form of an inflatable membrane structure, can only be in the forms of a hemisphere, a semi-ellipsoid or a oblate shell and the like, and is difficult to be suitable for concrete thin shell structures in other curved surface forms; secondly, when the air film structure is used as a supporting template, the construction load is borne by the fabric, and the fabric is difficult to ensure enough supporting rigidity in the face of larger construction load.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a construction method of a complex curved surface concrete thin shell structure by adopting a cable net fabric template, and solves the problems that the existing air film method is difficult to be suitable for other curved surface forms and the fabric is difficult to be suitable for larger construction load.
The technical scheme for realizing the purpose is as follows:
the invention provides a construction method of a complex curved surface concrete thin shell structure by adopting a cable mesh fabric template, which comprises the following steps:
establishing a cable net boundary and a target curved surface by combining the curved surface form of the concrete thin shell structure to be constructed;
designing the layout of the cable net by taking the established cable net boundary and the target curved surface as constraint conditions to form a cable net layout scheme;
cutting and analyzing the fabric by combining the layout scheme of the cable net to obtain a cutting scheme of the fabric;
optimizing the layout scheme of the cable net according to the construction load to obtain an optimized scheme and the prestress of the cable net;
designing a supporting frame according to the cable net boundary;
a supporting frame is erected at a design position, and a cable net is arranged on the erected supporting frame to form a cable net structure;
laying the cut fabric units on the cable net structure, and connecting the adjacent fabric units to form an integral fabric;
tensioning the cable net structure according to the prestress of the cable net; and
after tensioning is finished, concrete is sprayed on the cable net structure and the fabric layer by layer to form a complex curved surface concrete thin shell structure, and construction is finished.
The construction method of the invention adopts the cable net structure and the fabric thereon as the template, can be suitable for the construction of various complex curved surface forms, and the fabric can transmit the construction load to the cable net structure with supporting rigidity, further spray concrete to form a complex curved surface concrete thin shell structure, and realize the construction of concrete thin shell structures with different curved surface forms. The braced frame sets up in cable net border department, and to a great extent has reduced the input of manpower and material resources, economical and practical.
The construction method of the complex curved surface concrete thin shell structure adopting the cable mesh fabric target is further improved in that when the cable mesh boundary and the target curved surface are established, three-dimensional modeling software is adopted to establish the cable mesh boundary and the target curved surface.
The construction method of the complex curved surface concrete thin shell structure adopting the cable net fabric target is further improved in that when the cable net layout is designed to form a cable net layout scheme, the cable nets are arranged according to the main curvature of the target curved surface;
utilizing geodesic curvature to restrain the layout of the cable net;
and designing the layout of the cable net by taking the total using amount of the inhaul cables, the number of the cross points, the prestress and the fabric bearing capacity as constraints, thereby forming a layout scheme of the cable net.
The construction method of the complex curved surface concrete thin shell structure adopting the cable net fabric target is further improved in that when the fabric is cut and analyzed, the curved surface of the fabric is divided along the curved surface geodesic line in the layout scheme of the cable net, so that the cutting scheme of the fabric is obtained.
The construction method of the complex curved surface concrete thin shell structure adopting the cable net fabric target is further improved in that when the layout scheme of the cable net is optimized, finite element analysis software is utilized to convert construction load into node load and apply the node load to the cable net nodes, and the layout scheme of the cable net and the prestress of the cable net are optimized by taking the minimum structural response deflection as an optimization target.
The construction method of the complex curved surface concrete thin shell structure adopting the cable mesh fabric target is further improved in that two adjacent fabric units are spliced and connected through a heat seal welding technology.
The construction method of the complex curved surface concrete thin shell structure adopting the cable net fabric target is further improved in that when the cable net structure is tensioned, the tensioning is carried out according to a hierarchical and symmetrical tensioning principle, in the tensioning process, a three-dimensional scanner is used for monitoring the tensioning process of the cable net structure and the fabric in real time to form a corresponding point cloud model, the point cloud model is compared with a designed shape, and the next tensioning is carried out according to a comparison result so that the cable net structure is tensioned to the designed shape.
Drawings
FIG. 1 is a flow chart of the construction method of the complex curved surface concrete thin shell structure adopting the cable mesh fabric template of the invention.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 1, the invention provides a construction method of a complex curved surface concrete thin shell structure by adopting a cable mesh fabric template, which is used for realizing the construction of concrete thin shell structures with different curved surface forms. The cable net structure and the fabric on the cable net structure are used as templates to support the concrete thin-shell structure for construction, the fabric can transmit construction load to the cable net structure with supporting rigidity, the cable net fabric template forms a flexible self-balancing structure system, curved surfaces with different curvatures can be obtained through reasonable design, and the construction of the concrete thin-shell structure with the complex curved surfaces can be realized by combining a concrete spraying technology on the basis. On the other hand, the removal of the supporting frame greatly reduces the investment of manpower and material resources, and is economical and practical. The construction method of the complex curved concrete thin shell structure using the cable mesh fabric formwork of the present invention will be described below with reference to the accompanying drawings.
Referring to fig. 1, a flow chart of a construction method of a complex curved concrete thin shell structure using a cable mesh fabric formwork according to the present invention is shown. The construction method of the complex curved concrete thin shell structure using the cable mesh fabric formwork of the present invention will be described with reference to fig. 1.
As shown in fig. 1, the construction method of the complex curved surface concrete thin shell structure using the cable mesh fabric template of the present invention comprises the following steps:
step S11 is executed, and a cable net boundary and a target curved surface are established by combining the curved surface form of the concrete thin shell structure to be constructed; then, step S12 is executed;
step S12 is executed, the cable net layout is designed by taking the established cable net boundary and the target curved surface as constraint conditions to form a cable net layout scheme; then, step S13 is executed;
step S13 is executed, the fabric is cut and analyzed by combining the layout scheme of the cable net to obtain the cutting scheme of the fabric; then, step S14 is executed;
step S14 is executed, the layout scheme of the cable net is optimized according to the construction load, and the optimized scheme and the prestress of the cable net are obtained; then, step S15 is executed;
step S15 is executed, and a support frame is designed according to the cable net boundary; then, step S16 is executed;
step S16 is executed, a supporting frame is erected at the design position, and a cable net is installed on the erected supporting frame to form a cable net structure; then, step S17 is executed;
step S17 is executed, the cut fabric units are laid on the cable net structure, and the adjacent fabric units are connected to form an integral fabric; then, step S18 is executed;
step S18 is executed, the cable net structure is tensioned according to the prestress of the cable net; then, step S19 is executed;
and step S19, after tensioning is finished, spraying concrete on the cable net structure and the fabric layer by layer to form a complex curved surface concrete thin shell structure, and thus finishing construction.
Because the cable mesh fabric template is a flexible self-balancing structural system, curved surfaces with different curvatures can be obtained through reasonable design, and the construction of a concrete thin-shell structure with a complex curved surface can be realized by combining a concrete spraying technology on the basis. On the other hand, the removal of the support scaffold system also reduces the investment of manpower and material resources to a great extent, and is economical and practical.
In a specific embodiment of the present invention, when the cable net boundary and the target curved surface are established, three-dimensional modeling software is used to establish the cable net boundary and the target curved surface.
Since the construction target is mostly a complex surface, the target surface and the boundary thereof need to be quantized by a non-uniform rational B-spline surface, which can be realized by three-dimensional modeling software such as 3DMAX or Rhino 3D.
In a specific embodiment of the present invention, when the layout of the cable net is designed to form a cable net layout scheme, the laid cable net is arranged according to the principal curvature of the target curved surface;
utilizing geodesic curvature to restrain the layout of the cable net;
and designing the layout of the cable net by taking the total using amount of the inhaul cables, the number of the cross points, the prestress and the fabric bearing capacity as constraints, thereby forming a layout scheme of the cable net.
Specifically, the design principle of the cable net has several aspects, one is that the bearing capacity of the cable net structure is in direct proportion to the prestress and the curvature thereof, and in order to reduce the application amount of the prestress, the cable net structure is arranged according to the main curvature of a target curved surface; secondly, in order to reduce the consumption of the fabric material, the geodesic curvature of the cable net structure is required to be as small as possible; thirdly, the size of the cable net grid should comprehensively consider the factors such as the using amount of the stay cables, the number of the cross points, the application of prestress, the bearing capacity of the fabric structure and the like.
In a specific embodiment of the invention, when the fabric is cut and analyzed, the curved surface of the fabric is divided along a curved surface geodesic line in the layout scheme of the cable net, so that the cutting scheme of the fabric is obtained.
The fabric is limited by the influence of the width of the fabric, and often needs to be cut and analyzed to be spliced into a target curved surface structure. And (3) combining the layout scheme of the cable net, dividing the curved surface of the fabric along a curved surface geodesic (which is equal to a cable net structure) until the deviation between the curved surface expansion area of each piece of fabric and the original curved surface area is within an allowable range.
In a specific embodiment of the invention, when the layout scheme of the cable net is optimized, the finite element analysis software is utilized to convert the construction load into node load and apply the node load to the cable net nodes, and the layout scheme of the cable net and the prestress of the cable net are optimized by taking the minimum structural response deflection as an optimization target.
And further optimizing the form of the cable net structure according to the construction load and determining the prestress of the cable net. Finite element analysis software such as 3D3S, ABAQUS and the like needs to re-check the response of the cable net structure under construction load after acquiring the most cable net prestress value so as to ensure that the cable net structure has enough support rigidity.
In a specific embodiment of the present invention, after determining the form and the prestress of the cable-net structure, a support frame is determined according to the boundary of the cable-net structure, and the support frame is determined based on the principle that the support frame has sufficient rigidity and can sufficiently fix the whole set of cable-net system, so that the cable-net system forms a self-balancing system. The structural form of the supporting frame needs to be determined by combining the size of the cable net structure, a wood structure can be adopted when the span is less than 3 m, and a steel frame is recommended when the span is more than 3 m.
In one embodiment of the invention, two adjacent fabric units are spliced and connected by a heat seal welding technology.
And calculating the blanking length of each cable according to the final design form and the prestress value of the cable net structure, cutting the fabric according to the cutting analysis result, and splicing into an integral fabric by a heat seal welding technology.
In a specific embodiment of the invention, when the cable net structure is tensioned, the tensioning is carried out according to a hierarchical and symmetrical tensioning principle, in the tensioning process, a three-dimensional scanner is utilized to monitor the tensioning process of the cable net structure and the fabric in real time and form a corresponding point cloud model, the point cloud model is compared with a designed shape, and the next tensioning is carried out according to a comparison result so that the cable net structure is tensioned to the designed shape.
In consideration of the fact that errors exist between the stretched shape of the cable net structure and the designed shape in the actual construction process, the stretching process of the cable net fabric template is monitored in real time by means of a three-dimensional scanner, a point cloud model of the fabric template is formed at a computer terminal in the monitoring process, the design shape is compared, and a next cable net fabric template stretching scheme is provided.
The invention has the beneficial effects that: because the cable mesh fabric template is a flexible self-balancing structural system, curved surfaces with different curvatures can be obtained through reasonable design, and the construction of a concrete thin-shell structure with a complex curved surface can be realized by combining a concrete spraying technology on the basis. On the other hand, the removal of the supporting frame also reduces the investment of manpower and material resources to a great extent, and is economical and practical.
While the present invention has been described in detail and with reference to the embodiments thereof as illustrated in the accompanying drawings, it will be apparent to one skilled in the art that various changes and modifications can be made therein. Therefore, certain details of the embodiments are not to be interpreted as limiting, and the scope of the invention is to be determined by the appended claims.
Claims (7)
1. A construction method of a complex curved surface concrete thin shell structure adopting a cable mesh fabric template is characterized by comprising the following steps:
establishing a cable net boundary and a target curved surface by combining the curved surface form of the concrete thin shell structure to be constructed;
designing the layout of the cable net by taking the established cable net boundary and the target curved surface as constraint conditions to form a cable net layout scheme;
cutting and analyzing the fabric by combining the layout scheme of the cable net to obtain a cutting scheme of the fabric;
optimizing the layout scheme of the cable net according to the construction load to obtain an optimized scheme and the prestress of the cable net;
designing a supporting frame according to the cable net boundary;
a supporting frame is erected at a design position, and a cable net is arranged on the erected supporting frame to form a cable net structure;
laying the cut fabric units on the cable net structure, and connecting the adjacent fabric units to form an integral fabric;
tensioning the cable net structure according to the prestress of the cable net; and
after tensioning is finished, concrete is sprayed on the cable net structure and the fabric layer by layer to form a complex curved surface concrete thin shell structure, and construction is finished.
2. The method for constructing a complex curved concrete thin shell structure using a cable mesh fabric target as claimed in claim 1, wherein the establishment of the cable mesh boundary and the target curved surface is performed using three-dimensional modeling software when the cable mesh boundary and the target curved surface are established.
3. The method of constructing a complex curved concrete thin shell structure using a cable mesh fabric target according to claim 1, wherein the cable mesh layout is designed to form a cable mesh layout scheme such that the laid cable mesh is laid in accordance with a principal curvature of a target curved surface;
utilizing geodesic curvature to restrain the layout of the cable net;
and designing the layout of the cable net by taking the total using amount of the inhaul cables, the number of the cross points, the prestress and the fabric bearing capacity as constraints, thereby forming a layout scheme of the cable net.
4. The method of claim 1, wherein the fabric is cut and analyzed, and the fabric curved surface is divided along a curved surface geodesic line in the cable mesh layout scheme, thereby obtaining a fabric cutting scheme.
5. The method of constructing a complex curved concrete shell structure using a cable mesh fabric target as claimed in claim 1, wherein in optimizing the cable mesh layout scheme, a finite element analysis software is used to convert the construction load into node loads and apply them to the cable mesh nodes, and the cable mesh layout scheme and the cable mesh prestress are optimized with the minimum structural response deflection as an optimization target.
6. The method for constructing a complex curved concrete shell structure using a cable mesh fabric object as claimed in claim 1, wherein adjacent two fabric units are joined by thermal sealing and welding.
7. The method for constructing a complex curved concrete thin shell structure with a cable net fabric target according to claim 1, wherein the cable net structure is tensioned according to a hierarchical and symmetrical tensioning principle, the tensioning process of the cable net structure and the fabric is monitored in real time by a three-dimensional scanner during tensioning, a corresponding point cloud model is formed, the point cloud model is compared with a designed shape, and the next tensioning is performed according to a comparison result so that the cable net structure is tensioned to the designed shape.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118461899A (en) * | 2024-03-11 | 2024-08-09 | 北京市建筑设计研究院股份有限公司 | Method for controlling temperature and earthquake response of frame structure by using lateral force cable |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118461899A (en) * | 2024-03-11 | 2024-08-09 | 北京市建筑设计研究院股份有限公司 | Method for controlling temperature and earthquake response of frame structure by using lateral force cable |
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