CN114575370B - High-low span foundation structure and construction method - Google Patents
High-low span foundation structure and construction method Download PDFInfo
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- CN114575370B CN114575370B CN202210348617.7A CN202210348617A CN114575370B CN 114575370 B CN114575370 B CN 114575370B CN 202210348617 A CN202210348617 A CN 202210348617A CN 114575370 B CN114575370 B CN 114575370B
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- 238000010276 construction Methods 0.000 title claims abstract description 48
- 239000004567 concrete Substances 0.000 claims abstract description 57
- 230000008093 supporting effect Effects 0.000 claims description 29
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 230000002787 reinforcement Effects 0.000 claims description 8
- 238000005056 compaction Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims 2
- 238000007569 slipcasting Methods 0.000 abstract description 7
- 238000011065 in-situ storage Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 2
- 238000004904 shortening Methods 0.000 abstract description 2
- 238000005266 casting Methods 0.000 description 10
- 101100491335 Caenorhabditis elegans mat-2 gene Proteins 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/01—Flat foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/01—Flat foundations
- E02D27/013—Shuttering specially adapted therefor
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/16—Arrangement or construction of joints in foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
Abstract
The application relates to a high-low span foundation structure, which belongs to the field of constructional engineering and comprises a foundation layer, a cushion layer and raft layers; the base layer comprises a high-span region, a low-span region and a connecting slope; the cushion layer is paved on the surfaces of the high-span area, the low-span area and the connecting slope surface; the raft layer is including the high cross-layer raft board that is located high cross-region top and the low cross-layer raft board that is located low cross-region top, high cross-layer raft board extends to the top of low cross-layer raft board towards the one end in low cross-region, link to each other through vertical setting's connecting portion between low cross-layer raft board and the one end that high cross-layer raft board extends to low cross-layer raft board top, form one between high cross-layer raft board, connect domatic and the connecting portion and pour the chamber, be provided with on the high cross-layer raft board and pour the slip casting mouth that the intracavity portion is linked together, pour the inside of chamber and fill up the cast in situ concrete structure. The application also discloses a construction method of the high-low span foundation structure. The method has the effect of shortening the construction period of the high-low span foundation.
Description
Technical Field
The application relates to the field of building construction, in particular to a high-low span foundation structure and a construction method.
Background
Because of the height difference of different functions of the foundation soleplates, the foundation soleplates form a high-low span foundation structure, and the high-low span foundation structure is mostly formed by concrete pouring during construction, so that the low span and the high span are usually constructed twice during construction of the high-low span foundation structure.
According to the existing construction method, the high-low span foundation structure should be constructed for the low span first, namely the high span is constructed after the backfilling construction of the low span is completed. Because the structure on the high-span layer can only carry out high-span construction after the construction of the equal-span is finished, the whole construction period is long.
Disclosure of Invention
In order to shorten the construction period of a high-low span foundation, the application provides a high-low span foundation structure and a construction method.
The high-low span basic structure provided by the application adopts the following technical scheme:
a high-low span foundation structure comprises a foundation layer, a cushion layer and a raft layer positioned above the cushion layer;
the base layer comprises a high-cross region, a low-cross region and a connection slope for connecting the high-cross region and the low-cross region;
the cushion layer is paved on the surfaces of the high-span area, the low-span area and the connection slope;
the raft layer comprises a high-span raft plate positioned above a high-span region and a low-span raft plate positioned above a low-span region, wherein one end of the high-span raft plate, which faces the low-span region, extends to the position above the low-span raft plate, the low-span raft plate is connected with one end of the high-span raft plate, which extends to the position above the low-span raft plate, through a vertically arranged connecting part, and a pouring cavity is formed among the high-span raft plate, the connecting slope and the connecting part;
the high-span raft is provided with a grouting port communicated with the inside of the pouring cavity, and the inside of the pouring cavity is filled with a cast-in-place concrete structure.
Through adopting above-mentioned technical scheme, the high-span can separate with the area of striding and construct simultaneously, finally connect the back with high-span raft and low-span raft through the connecting portion, thereby to the high-span raft, connect the slope and the connecting portion between the formed pouring intracavity pouring concrete form cast in situ concrete structure, cast in situ concrete structure is with high-span raft and low-span raft connection as an organic whole, can guarantee the intensity of the high-low basic structure that finally forms, can shorten the construction cycle of high-low basic structure simultaneously.
Optionally, an elastic plug for sealing the grouting opening is detachably connected to the inside of the grouting opening.
Through adopting above-mentioned technical scheme, after pouring the intracavity and pouring the concrete, can be with the slip casting mouth shutoff to prevent that external foreign matter from entering into the intracavity of pouring, thereby influence the solidification of pouring the intracavity concrete.
Optionally, a waterproof layer is arranged on the surface of the cushion layer.
By adopting the technical scheme, the waterproof function of the high-low span foundation structure is increased.
The construction method of the high-low span foundation structure adopts the following technical scheme:
a construction method of a high-low span foundation structure comprises the following specific construction steps:
firstly, cushion layer construction: constructing a cushion layer on the surfaces of the high-span region, the low-span region and the connecting slope surface;
secondly, building a supporting system: a supporting system is built at one end, close to the high-span region, of the low-span region, and comprises a bearing plate with the top surface flush with the top surface of the cushion layer on the high-span region and a supporting frame positioned below the bearing plate for supporting the bearing plate, wherein one end, facing the high-span region, of the bearing plate is butted with the cushion layer on the high-span region;
thirdly, constructing a high-span raft: building a pouring template on the surface of a cushion layer on the high-span region and the top surface of a bearing plate, forming a pouring space for pouring the high-span raft through the pouring template, binding steel bars in the pouring space, pouring concrete into the pouring space after the steel bars are bound to form the high-span raft, and removing the pouring template after the high-span raft is completely solidified and formed;
fourthly, constructing a low-cross-layer raft: building a pouring template on the surface of a cushion layer on the low-span region, forming a pouring space for pouring the low-span raft through the pouring template, binding steel bars in the pouring space, pouring concrete into the pouring space after the steel bars are bound to form the low-span raft, and removing the pouring template after the low-span raft is completely solidified and formed;
fifthly, building a connecting part pouring template and pouring the connecting part: building a pouring template for pouring a connecting part between the formed high-span raft and the formed low-span raft, building a reinforcement cage between the high-span raft and the low-span raft before building the pouring template, enclosing the reinforcement cage inside the pouring template, pouring concrete into the pouring template after building, forming the connecting part for connecting the low-span raft and the high-span raft after the concrete is formed, and dismantling the pouring template after the concrete is solidified and formed;
sixth, removing the supporting system: after the high-span raft, the low-span raft and the connecting parts are all solidified and excavated, removing the supporting system;
seventh, backfilling and pouring the pouring cavity: firstly, sealing and closing openings at two ends of a pouring cavity through a template, pouring concrete into the pouring cavity through a grouting opening after the openings at two ends of the pouring cavity are closed until the pouring cavity is filled with the concrete, and forming a cast-in-place concrete structure after the concrete is solidified.
By adopting the technical scheme, the supporting system forms the supporting platform at one end of the low-span region towards the high-span region, so that pouring of the high-span raft can be performed at the high-span region and the formed supporting platform, meanwhile, construction of the low-span region part is performed at the low-span region, the traditional process is not needed, the construction can be performed after the construction of the low-span region is completed, partial construction can be performed in the same period of time, front-back connection construction is not needed, and the construction period is shortened.
Optionally, a shear support is arranged on the support frame.
Through adopting above-mentioned technical scheme, increase the bearing capacity of support frame, improve the stability of loading board.
Optionally, in the third step, when constructing the high-span raft, when pouring the high-span raft, insert the grouting pipe that the top is higher than the pouring template in the pouring space in advance, the bottom of grouting pipe links to each other with the loading board, and after the concrete solidifies, the hole of grouting pipe forms the slip casting mouth that communicates high-span raft top surface and bottom surface.
By adopting the technical scheme, the grouting port is convenient to form on the high-span raft.
Optionally, the surface of the bearing plate is provided with a plug hole, and the bottom end of the grouting pipe is inserted into the plug hole.
Through adopting above-mentioned technical scheme, insert the spliced eye of loading board with the bottom of slip casting pipe in, when demolish the back at the loading board, the bottom of slip casting pipe is located the below of high cross-layer raft to ensure that the slip casting pipe can be with pouring the top space intercommunication of chamber and high cross-layer raft.
Optionally, in the seventh step, when the pouring cavity is backfilled and poured, when the concrete in the pouring cavity is poured one meter below the high-span raft, pouring is performed by adopting self-compaction micro-expansion concrete.
Through adopting above-mentioned technical scheme, because the condition of pouring the intracavity can not be seen clearly of straight tube when pouring the intracavity concreting, consequently can fill up the pouring chamber as far as possible through self-compaction micro-expansion concrete, make the top department of pouring the chamber be difficult for appearing the cavity.
Optionally, after the first step and the cushion layer construction are finished, a waterproof layer is paved on the surface of the cushion layer.
By adopting the technical scheme, the waterproof performance of the finally formed high-low span foundation structure is increased.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the high-span area and the ground-span area can be separated and constructed simultaneously, after the high-span raft and the low-span raft are connected through the connecting part, concrete is poured into a pouring cavity formed among the high-span raft, the connecting slope and the connecting part, so that a cast-in-place concrete structure is formed, the high-span raft and the low-span raft are connected into a whole through the cast-in-place concrete structure, the strength of the finally formed high-low-span foundation structure can be ensured, and meanwhile, the construction period of the high-low-span foundation structure can be shortened;
2. the support system forms a support platform at one end of the low-span region towards the high-span region, so that pouring of the high-span raft can be performed at the high-span region and the formed support platform, and meanwhile, construction of the low-span region is performed at the low-span region, so that the construction can be performed after the construction of the low-span region is completed without waiting for the completion of the conventional process, part of construction can be performed in the same period of time without front-back connection construction, and the construction period is shortened;
3. the self-compaction micro-expansion concrete is adopted to fill the pouring cavity after the distance from the high-span raft is one meter, so that the pouring cavity can be filled as much as possible, and the top of the pouring cavity is not easy to generate a cavity.
Drawings
FIG. 1 is a schematic structural diagram of a high-low span infrastructure of an embodiment of the present application;
fig. 2 is a schematic view of a support structure of a support system for a high-cross-layer raft in an embodiment of the present application;
FIG. 3 is a schematic structural view of a support system in an embodiment of the present application;
fig. 4 is a schematic view of a connection structure between a grouting pipe and a carrier plate in an embodiment of the present application.
Reference numerals illustrate: 1. a base layer; 11. a high cross-zone; 12. a low cross-zone; 13. connecting the slope; 2. a cushion layer; 21. a waterproof layer; 3. raft layers; 31. high-cross-layer raft; 311. a grouting port; 32. a low cross-layer raft; 33. a connection part; 4. pouring the cavity; 5. cast-in-place concrete structure; 6. elastic blocking; 7. a support system; 71. a carrying plate; 711. a plug hole; 72. a support frame; 73. a shear support; 8. grouting pipe.
Detailed Description
The present application is described in further detail below in conjunction with figures 1-4.
The embodiment of the application discloses a high-low span infrastructure.
Referring to fig. 1, the high-low span foundation structure includes a foundation layer 1, a bedding layer 2 laid on the surface of the foundation layer 1, and a raft layer 3 above the bedding layer 2. The base layer 1 includes a high-cross region 11, a low-cross region 12 having a tip surface lower than the high-cross region 11, and a connection slope 13 between the high-cross region 11 and the low-cross region 12, and the connection slope 13 connects the surface of the high-cross region 11 and the surface of the low-cross region 12. The mat 2 is laid on the surface of the high-cross region 11, the low-cross region 12 and the connection slope 13.
A waterproof layer 21 is laid on the surface of the cushion layer 2.
The raft layer 3 includes a high-span raft 31 above the bedding layer 2 of the high-span region 11 and a low-span raft 32 above the bedding layer 2 of the low-span region 12, and the high-span raft 31 extends above the low-span raft 32 toward one end of the low-span region 12. A vertically arranged connecting part 33 is arranged between one end of the high-span raft 31 extending to the upper part of the low-span raft 32 and the low-span raft 32, the top end of the connecting part 33 is connected with the high-span raft 31, and the bottom end of the connecting part 33 is connected with the low-span raft 32. The connection portion 33 is constructed of reinforced concrete.
The high-span raft 31 extends to a position above the low-span region 12, and a pouring cavity 4 is formed among the connecting part 33 and the connecting slope 13. Grouting openings 311 which communicate the space above the high-span raft 31 with the pouring cavity 4 are arranged on the high-span raft 31. The inside that is located pouring chamber 4 is provided with the cast in situ concrete structure 5 that concretes through pouring into pouring chamber 4 inside slip casting mouth 311.
An elastic plug 6 is provided in the grouting port 311, and one end of the elastic plug 6 is inserted into the grouting port 311 to close the grouting port 311. The elastic plug 6 is fixed inside the grouting hole 311 by friction. When concrete needs to be poured into the pouring cavity 4 through the grouting openings 311, the elastic plugs 6 are pulled out forcefully, and the grouting openings 311 can be opened.
The embodiment of the application also discloses a construction method of the high-low span foundation structure, which comprises the following specific steps:
firstly, cushion layer construction: the mat 2 is applied to the surface of the high-crossing region 11, the low-crossing region 12, and the connection slope 13. After the cushion layer 2 is molded, a waterproof layer 21 is paved on the surface of the cushion layer 2, and the waterproof layer 21 is made of waterproof coiled materials or sprayed waterproof paint.
Secondly, building a supporting system: referring to fig. 2 and 3, a support system 7 is set up at one end of the low-span region 12 near the high-span region 11, the support system 7 includes a carrier plate 71 with its top surface flush with the top surface of the cushion layer 2 on the high-span region 11, and a support frame 72 below the carrier plate 71 for supporting the carrier plate 71, where the carrier plate 71 is horizontally disposed. The end of the carrier plate 71 facing the high-cross region 11 is abutted against the cushion layer 2 on the high-cross region 11.
The supporting frame 72 is also provided with a shear support 73, and the stability of the supporting frame 72 is increased through the shear support 73, so that the supporting effect of the supporting frame 72 on the bearing plate 71 is ensured.
Thirdly, constructing a high-span raft: firstly, a pouring template for pouring the high-span raft 31 is built on the surface of the cushion layer 2 on the high-span region 11 and the top end surface of the bearing plate 71, and a pouring space of the high-span raft 31 is formed on the top end surfaces of the high-span region 11 and the bearing plate 71 through the pouring template. And (3) carrying out steel bar binding in the casting space, casting concrete into the casting space after the steel bar binding and the casting template are all installed, and forming the high-span raft 31 after the concrete is solidified.
And after the high-span raft 31 is completely solidified and formed, removing the pouring template of the high-span raft 31.
Referring to fig. 4, a plugging hole 711 is provided on the top surface of the bearing plate 71, a grouting pipe 8 is plugged into the plugging hole 711, the grouting pipe 8 is vertically arranged, and the top end of the grouting pipe 8 is higher than the casting template of the built high-span raft 31. When the concrete sets, the top ends of the grouting pipes 8 are higher than the formed high-span raft 31.
Fourthly, constructing a low-cross-layer raft: and building a pouring template for pouring the low-span raft 32 on the surface of the low-span region 12, and forming a pouring space on the top surface of the low-span region 12 through the pouring template. And (3) carrying out steel bar binding in the casting space, casting concrete into the casting space after the steel bar binding and the casting template are installed, and forming the low-span raft 32 after the concrete is solidified.
And after the low-span raft is solidified and formed, the pouring template of the low-span raft is removed.
And thirdly, constructing the high-span raft, and fourthly, constructing the low-span raft synchronously after constructing the supporting system in the second step, thereby shortening the whole construction period.
Fifthly, building a connecting part pouring template and pouring the connecting part: and a pouring template is built between the lower part of one end of the formed high-span raft 31, which faces the low-span region 12, and the upper part of one end of the formed low-span raft 32, which faces the high-span region 11, a pouring space is formed by the pouring template, the bottom end of the pouring space is connected with the formed low-span raft 32, and the top end of the pouring space is connected with the formed high-span raft 31.
Before the connecting portion pouring template is built, a reinforcement cage is built between the high-span raft 31 and the low-span raft 32, the top end of the reinforcement cage is fixed with the high-span raft 31, and the bottom end of the reinforcement cage is fixed with the low-span raft 32. And then when the connecting part pouring template is built, the pouring template encloses the steel reinforcement cage inside.
When concrete is poured into the pouring templates, connecting parts 33 for connecting the high-span raft 31 and the low-span raft 32 are formed after the concrete is formed. The high-span raft 31, the low-span raft 32 and the connecting parts 33 form a complete whole.
After the connection portion 33 is completely formed, the casting form of the connection portion is removed.
Sixth, removing the supporting system: after the high-span raft 31, the low-span raft 32 and the connection portions 33 are all solidified, the supporting system 7 is removed. After the bearing plates 71, the supporting frames 72 and the shear braces 73 are removed, the grouting pipe 8 remains inside the high-span raft 31 and penetrates the high-span raft 31.
After the support system is removed, a pouring cavity 4 with two open ends is formed among the high-span raft 31, the connection slope 13 and the low-span region 12.
Seventh, backfilling and pouring the pouring cavity: firstly, the openings at the two ends of the pouring cavity 4 are sealed and closed through the template engineering, after the openings at the two ends of the pouring cavity 4 are closed, concrete is poured into the pouring cavity 4 through the grouting pipe 8 until the concrete fills the pouring cavity 4, and after the concrete entering the pouring cavity 4 is finally solidified, the templates at the two ends of the pouring cavity 4 are removed, so that the construction of the high-low span foundation is completed.
When concrete is poured into the pouring cavity 4, when the concrete is one meter away from the high-span raft 31, self-compaction micro-expansion concrete is poured into the pouring cavity through the grouting pipe 8 until the pouring cavity 4 is filled.
According to the construction method of the high-low span foundation, the supporting system 7 forms the supporting platform at one end of the low span region 12 towards the high span region 11, so that pouring of the high span raft 31 can be performed at the high span region 11 and the formed supporting platform, meanwhile, construction of the low span region 12 is performed at the low span region 12, the construction can be performed after the construction of the low span region 12 is completed, like a traditional process, partial construction can be performed in the same period of time without front-back connection construction, and the construction period is shortened. And the construction of the connecting part 33 is carried out between the final high-span raft 31 and the low-span raft 32, the high-span raft 31 and the low-span raft 32 are connected together through the connecting part 33, and finally concrete is poured into the formed pouring cavity 4, so that the strength of the final formed high-span foundation and the final formed low-span foundation is ensured.
The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.
Claims (8)
1. A high-low span infrastructure characterized by: comprises a base layer (1), a cushion layer (2) and a raft layer (3) positioned above the cushion layer (2);
the base layer (1) comprises a high-cross region (11), a low-cross region (12) and a connection slope (13) for connecting the high-cross region (11) and the low-cross region (12);
the cushion layer (2) is paved on the surfaces of the high-span region (11), the low-span region (12) and the connecting slope (13);
the raft layer (3) comprises a high-span raft plate (31) positioned above a high-span region (11) and a low-span raft plate (32) positioned above a low-span region (12), one end of the high-span raft plate (31) facing the low-span region (12) extends to the upper side of the low-span raft plate (32), the low-span raft plate (32) is connected with one end of the high-span raft plate (31) extending to the upper side of the low-span raft plate (32) through a vertically arranged connecting part (33), and a pouring cavity (4) is formed among the high-span raft plate (31), the connecting slope (13) and the connecting part (33);
a grouting port (311) communicated with the inside of the pouring cavity (4) is arranged on the high-span raft (31), and the inside of the pouring cavity (4) is filled with a cast-in-place concrete structure (5); the concrete construction steps are as follows:
firstly, cushion layer construction: a cushion layer (2) is constructed on the surfaces of the high-span region (11), the low-span region (12) and the connecting slope (13);
secondly, building a supporting system: a supporting system (7) is built at one end, close to the high-span region (11), of the low-span region (12), the supporting system (7) comprises a bearing plate (71) with the top surface being flush with the top surface of the cushion layer (2) on the high-span region (11) and a supporting frame (72) which is positioned below the bearing plate (71) and is used for supporting the bearing plate (71), and one end, facing the high-span region (11), of the bearing plate (71) is butted with the cushion layer (2) on the high-span region (11);
thirdly, constructing a high-span raft: building a pouring template on the surface of a cushion layer (2) on a high-span region (11) and the top surface of a bearing plate (71), forming a pouring space for pouring the high-span raft (31) through the pouring template, binding reinforcing steel bars in the pouring space, pouring concrete into the pouring space after the reinforcing steel bars are bound to form the high-span raft (31), and dismantling the pouring template after the high-span raft (31) is completely solidified and formed;
fourthly, constructing a low-cross-layer raft: building a pouring template on the surface of a cushion layer (2) on the low-span region (12), forming a pouring space for pouring the low-span raft (32) through the pouring template, binding steel bars in the pouring space, pouring concrete into the pouring space after the steel bars are bound to form the low-span raft (32), and removing the pouring template after the low-span raft (32) is completely solidified and formed;
fifthly, building a connecting part pouring template and pouring the connecting part: building a pouring template for pouring a connecting part (33) between the formed high-span raft (31) and the formed low-span raft (32), building a reinforcement cage between the high-span raft (31) and the low-span raft (32) before building the pouring template, enclosing the reinforcement cage inside by the pouring template, pouring concrete into the pouring template after building, forming the connecting part (33) for connecting the low-span raft (32) and the high-span raft (31) after the concrete is formed, and dismantling the pouring template after the concrete is solidified and formed;
sixth, removing the supporting system: after the high-span raft (31), the low-span raft (32) and the connecting part (33) are all solidified and dug, the supporting system (7) is removed;
seventh, backfilling and pouring the pouring cavity: firstly, opening at two ends of a pouring cavity (4) are sealed and closed through a template, concrete is poured into the pouring cavity (4) through a grouting opening (311) after the opening at two ends of the pouring cavity (4) is closed until the pouring cavity (4) is filled with the concrete, and a cast-in-place concrete structure (5) is formed after the concrete is solidified.
2. A high and low span infrastructure as claimed in claim 1, wherein: an elastic plug (6) for sealing the grouting opening (311) is detachably connected to the inside of the grouting opening (311).
3. A high and low span infrastructure as claimed in claim 1, wherein: the surface of the cushion layer (2) is provided with a waterproof layer (21).
4. A high and low span infrastructure as claimed in claim 1, wherein: and a shear support (73) is arranged on the support frame (72).
5. A high and low span infrastructure as claimed in claim 1, wherein: when the high-span raft (31) is constructed in the third step, grouting pipes (8) with the top ends higher than the pouring templates are inserted into the pouring space in advance, the bottom ends of the grouting pipes (8) are connected with the bearing plates (71), and after concrete is solidified, grouting openings (311) which are communicated with the top end surfaces and the bottom end surfaces of the high-span raft (31) are formed in inner holes of the grouting pipes (8).
6. A high and low span infrastructure as claimed in claim 5, wherein: the surface of the bearing plate (71) is provided with a plug hole (711), and the bottom end of the grouting pipe (8) is inserted into the plug hole (711).
7. A high and low span infrastructure as claimed in claim 1, wherein: and in the seventh step, when the pouring cavity (4) is backfilled and poured, when the concrete in the pouring cavity (4) is poured one meter below the high-span raft (31), the self-compaction micro-expansion concrete is adopted for pouring.
8. A high and low span infrastructure as claimed in claim 1, wherein: and after the first step and the construction of the cushion layer (2) are finished, a waterproof layer (21) is paved on the surface of the cushion layer (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210348617.7A CN114575370B (en) | 2022-04-01 | 2022-04-01 | High-low span foundation structure and construction method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210348617.7A CN114575370B (en) | 2022-04-01 | 2022-04-01 | High-low span foundation structure and construction method |
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| CN114575370A CN114575370A (en) | 2022-06-03 |
| CN114575370B true CN114575370B (en) | 2024-04-02 |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU4231289A (en) * | 1988-09-30 | 1990-04-05 | Csir | Foundation raft for a structure |
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| KR20210154337A (en) * | 2020-06-12 | 2021-12-21 | 정하동 | Construction Method of Underground Structures |
| CN113944192A (en) * | 2021-10-27 | 2022-01-18 | 上海宝冶集团有限公司 | Deformation joint connecting structure for basement roof soil covering area |
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2022
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| AU4231289A (en) * | 1988-09-30 | 1990-04-05 | Csir | Foundation raft for a structure |
| CN105714849A (en) * | 2016-01-29 | 2016-06-29 | 中国华冶科工集团有限公司 | Reverse construction method for adjacent high and low floors (bays) of basement |
| CN109372024A (en) * | 2018-11-29 | 2019-02-22 | 江苏兴厦建设工程集团有限公司 | A kind of sole plate waterproof structure for deformation seams and construction method |
| CN110219313A (en) * | 2019-06-05 | 2019-09-10 | 中国五冶集团有限公司 | A kind of underground construction blind shaft drainage system and construction method |
| KR20210154337A (en) * | 2020-06-12 | 2021-12-21 | 정하동 | Construction Method of Underground Structures |
| CN112412002A (en) * | 2020-11-14 | 2021-02-26 | 宝冶(郑州)建筑工程有限公司 | Striding type template support system |
| CN214659373U (en) * | 2021-05-11 | 2021-11-09 | 北京市第五建筑工程集团有限公司 | Reusable enclosure structure |
| CN113605443A (en) * | 2021-07-26 | 2021-11-05 | 北京城建集团有限责任公司 | High-low span concrete bottom plate construction structure and method thereof |
| CN113944192A (en) * | 2021-10-27 | 2022-01-18 | 上海宝冶集团有限公司 | Deformation joint connecting structure for basement roof soil covering area |
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