Construction method for closed sandwich foundation of low-rise building on basement roof

Abstract

The invention relates to a method for constructing a closed sandwich foundation of a low-rise building on a basement top plate, which is used for constructing the foundation of the low-rise building simultaneously with the construction of the basement top plate. The method comprises the following steps: S1, constructing the basement top plate; S2, constructing the structural columns of the bottom-floor building on the basement top plate; S3, constructing a retaining wall and a supporting wall between the structural columns of the bottom-floor building; S4, placing a steel truss floor deck on the retaining wall and the supporting wall as a whole; S5, supporting a formwork along the periphery of the steel truss floor deck; the present application cancels the backfilling of the cavity between the bottom-floor building and the basement top plate, adopts the structural mode of the supporting wall and the steel truss floor deck, ensures the bearing capacity of the first floor slab of the bottom-floor building constituting the foundation, and saves a large number of formwork and steel bar binding processes, greatly shortens the construction time and construction cost, and plays a role in saving labor.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, in particular to a construction method for a closed sandwich foundation of a low-rise building on a basement top plate. Background Art

[0002] In the construction project where the basement is built on the top slab of the basement, the design top elevation of the basement will generally be different from the bottom elevation of the bottom slab of the basement building. There will be a cavity between the bottom slab and the top slab of the basement, which can be regarded as a closed sandwich foundation at the bottom of the basement building. The conventional construction method is to backfill soil 13 between the lattice columns 11 on the basis of the basement top slab body 12 and compact it, then add a cushion layer 14, support the formwork and tie the building bottom slab steel bars, and finally pour the concrete layer 15 to complete the construction. Figure 5 The structure shown.

[0003] The existing construction of the bottom slab of the ground floor building is based on the construction of a closed mezzanine foundation formed at the bottom of the basement top slab. The progressive construction method of backfilling and compacting, cushion construction and first floor slab takes a long time for construction inside the cavity, which will prolong the construction period of the bottom building and affect the construction efficiency. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a method for constructing a closed mezzanine foundation of a low-rise building on a basement top plate, so as to solve the problem that the construction treatment of the mezzanine cavity between the bottom building bottom plate and the basement top plate in the prior art affects the construction efficiency of the bottom building.

[0005] To achieve the above object, the present invention provides a method for constructing a closed sandwich foundation of a low-rise building on a basement top plate, which is used to simultaneously construct the foundation of the low-rise building when constructing the basement top plate. The construction method comprises the following steps:

[0006] S1. Construction of basement roof;

[0007] S2. Construction of structural columns of the ground floor building on the basement roof;

[0008] S3. Construct retaining walls and supporting walls between the structural columns of the ground floor building;

[0009] S4. Placing the steel truss floor decking on the retaining wall and the supporting wall as a whole;

[0010] S5. Support the formwork along the outer periphery of the steel truss floor deck;

[0011] S6. Pour concrete into the steel truss floor slab to the designed elevation of the bottom floor slab, wait until the concrete is solidified, and then remove the formwork to complete the construction.

[0012] By adopting this technical solution, the backfill of the cavity between the ground floor building and the basement top plate is eliminated, and the structural method of supporting walls and reinforced truss floor decking is adopted to ensure the bearing capacity of the first floor slab of the ground floor building. A large number of formwork and steel bar binding processes are eliminated, which greatly shortens the construction time and construction cost, and at the same time saves labor.

[0013] Furthermore, the step S1 includes:

[0014] After the basement bottom structure is completed, the formwork is set up on the top of the basement and the basement top slab reinforcement is tied. At the same time, retaining wall reinforcement and supporting wall reinforcement are reserved at the designed position. Concrete is poured to the designed top elevation of the basement top slab. After the concrete is solidified, the formwork is removed to complete the basement top slab construction.

[0015] By adopting this technical solution, while the basement top plate is being consolidated and formed, the retaining wall steel bars and the supporting wall steel bars are integrally connected to the basement top plate. The retaining wall and the supporting wall subsequently constructed with the retaining wall steel bars and the supporting wall steel bars have high stability, which is beneficial to increase the relative stability between the bottom building slab and the basement top plate after construction.

[0016] Furthermore, the step S2 includes:

[0017] Tie the structural column reinforcement between the adjacent retaining wall reinforcements, set up the formwork and pour the concrete, wait for the concrete to solidify, remove the formwork and complete the structural column construction.

[0018] By adopting this technical solution, a basic main structure for the ground floor construction is provided, and at the same time, a prerequisite is provided for increasing the mutual stability when the retaining wall is formed as a whole with the structural column.

[0019] Furthermore, the step S3 includes:

[0020] Formwork is jointly set up on both sides of the retaining wall reinforcement and the supporting wall reinforcement between adjacent structural columns, and concrete is poured to the designed bottom elevation of the bottom building slab. After the concrete is solidified, the formwork is removed to complete the construction of the retaining wall and the supporting wall.

[0021] By adopting this technical solution, the retaining wall and the supporting wall are constructed simultaneously in an integrated casting form, which can reduce the construction time and increase the construction efficiency on the one hand, and increase the stability of the connection between them on the other hand.

[0022] Further, the step S4 includes:

[0023] The steel truss floor deck is processed according to the position relationship of the structural columns, retaining walls and supporting walls. After processing, it is hoisted to the retaining walls and supporting walls for joint support.

[0024] By adopting this technical solution, the retaining wall and the supporting wall provide the supporting surface to provide stable support for the steel truss floor deck, and the structural characteristics of the steel truss floor deck itself are utilized to avoid the welding process of the steel bars and the support of the bottom formwork, thereby reducing the construction difficulty of the bottom floor building slab, increasing its construction speed, and thereby increasing the construction efficiency of low-rise buildings.

[0025] Furthermore, the formwork supported on the periphery of the steel truss floor deck in step S5 should surround all structural columns at the same time.

[0026] By adopting this technical solution, the bottom plate of the low-rise building after casting does not exceed the common periphery of all structural columns, thereby increasing the accuracy of construction. At the same time, the bottom plate of the building is connected to the structural columns as a whole to increase stability.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The earth backfilling of the cavity between the ground floor building and the basement top plate is cancelled, and the structural method of supporting walls and reinforced truss floor decking is adopted to ensure the bearing capacity of the first floor slab of the ground floor building, and save a lot of formwork and steel bar binding processes, which greatly shortens the construction time and construction cost, and saves labor at the same time.

[0029] 2. The retaining wall and the supporting wall will not occupy much space in the cavity, the formwork support and construction are relatively convenient, and there will be no problems with formwork support and recovery difficulties. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a top view schematic diagram of the formation of step S1 of the method for constructing a closed sandwich foundation of a low-rise building on a basement top plate in the present invention;

[0031] Figure 2 It is a top view schematic diagram of the formation of step S2 of the method for constructing a closed sandwich foundation of a low-rise building on a basement top plate in the present invention;

[0032] Figure 3 It is a top view schematic diagram of the formation of step S3 of the construction method of the closed sandwich foundation of a low-rise building on the basement top plate of the present invention;

[0033] Figure 4 It is a schematic diagram of the main forming view of steps S4-S6 of the method for constructing a closed sandwich foundation of a low-rise building on a basement top plate of the present invention;

[0034] Figure 5 This is a schematic diagram of the local structure formed by conventional construction methods.

[0035] Explanation of the reference numerals in the accompanying drawings: 1. Basement roof; 2. Retaining wall; 3. Supporting wall; 4. Structural column; 5. Reinforced truss floor deck; 11. Lattice column; 12. Basement roof body; 13. Backfill soil; 14. Cushion layer; 15. Concrete layer. DETAILED DESCRIPTION

[0036] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0037] Please refer to the attached Figure 1-4 The present invention provides a method for constructing a closed mezzanine foundation of a low-rise building on a basement top plate, which is used for constructing a low-rise building foundation simultaneously with the construction of a basement top plate 1. The construction method comprises the following steps: S1, constructing a basement top plate 1; S2, constructing a structural column 4 of a bottom-level building on the basement top plate 1; S3, constructing a retaining wall 2 and a supporting wall 3 between the structural columns 4 of the bottom-level building; S4, placing a steel truss floor deck 5 on the retaining wall 2 and the supporting wall 3 as a whole; S5, supporting a formwork along the outer periphery of the steel truss floor deck 5; S6, pouring concrete on the steel truss floor deck 5 to the design elevation of the bottom-level building floor slab, until the concrete is solidified, and removing the formwork to complete the construction;

[0038] The backfilling of the cavity between the ground floor building and the basement top plate 1 is eliminated, and the structural method of supporting wall 3 and steel truss floor deck 5 is adopted to ensure the bearing capacity of the first floor slab of the ground floor building, save a lot of formwork and steel bar binding processes, greatly shorten the construction time and construction cost, and save labor at the same time.

[0039] Further, step S1 includes: on the basis of the completion of the construction of the basement bottom structure, supporting the formwork on the top of the basement and tying the basement top plate 1 steel bars, and at the same time reserving the retaining wall steel bars and the supporting wall steel bars at the designed position, pouring concrete to the designed top elevation of the basement top plate 1, and after the concrete is solidified, removing the formwork to complete the construction of the basement top plate 1;

[0040] While the basement top plate 1 is being consolidated and formed, the retaining wall reinforcement and the supporting wall reinforcement are integrally connected to the basement top plate 1. The retaining wall 2 and the supporting wall 3 subsequently constructed with the retaining wall reinforcement and the supporting wall reinforcement have high stability, which is beneficial to increasing the relative stability between the bottom building slab and the basement top plate 1 after construction.

[0041] Further, step S2 includes: tying the structural column 4 steel bars between adjacent retaining wall steel bars, pouring concrete after supporting the formwork, and after the concrete is solidified, removing the formwork to complete the construction of the structural column 4;

[0042] It provides the basic main structure for the bottom floor construction, and at the same time provides the prerequisite for the retaining wall 2 to be formed as one with the structural column 4 to increase the mutual stability.

[0043] Further, step S3 includes: jointly supporting formwork on both sides of the retaining wall reinforcement and both sides of the supporting wall reinforcement between adjacent structural columns 4, pouring concrete to the designed bottom elevation of the bottom building slab, and after the concrete is solidified, removing the formwork to complete the construction of the retaining wall 2 and the supporting wall 3;

[0044] The retaining wall 2 and the supporting wall 3 are constructed simultaneously in an integrated casting manner, which can reduce the construction time and increase the construction efficiency on the one hand, and increase the stability of the connection between them on the other hand.

[0045] Further, step S4 includes: processing the steel truss floor deck 5 according to the position relationship between the structural column 4, the retaining wall 2 and the supporting wall 3, and after the processing is completed, hoisting it to the retaining wall 2 and the supporting wall 3 for joint support;

[0046] The retaining wall 2 and the supporting wall 3 provide a supporting surface to provide stable support for the steel truss floor deck 5. The structural characteristics of the steel truss floor deck 5 itself are utilized to avoid the welding process of steel bars and the support of the bottom formwork, thereby reducing the construction difficulty of the bottom floor building slab, increasing its construction speed, and further increasing the construction efficiency of low-rise buildings.

[0047] Furthermore, in step S5, the formwork supported on the periphery of the steel truss floor slab 5 should simultaneously surround the structural columns 4, so that the low-rise building floor slab after casting does not exceed the common periphery of the structural columns 4, thereby increasing the construction accuracy and connecting the bottom building floor slab with the structural columns 4 as a whole to increase stability.

[0048] In order to prevent water from entering the construction space during construction, water retaining cloth should be placed on the scaffolding outside the ground floor construction.

[0049] The present invention is described in detail above in conjunction with the embodiments of the accompanying drawings. A person skilled in the art can make various variations of the present invention according to the above description. Therefore, certain details in the embodiments should not constitute a limitation of the present invention, and the scope of protection of the present invention shall be defined by the scope of the attached claims.

Claims

1. A method for constructing a closed sandwich foundation of a low-rise building on a basement roof, which is used to construct the foundation of the low-rise building simultaneously with the construction of the basement roof, characterized in that: The construction method comprises the following steps: S1. Construction of basement roof; S2. Construction of structural columns of the ground floor building on the basement roof; S3. Construct retaining walls and supporting walls between the structural columns of the ground floor building; S4. Placing the steel truss floor decking on the retaining wall and the supporting wall as a whole; S5. Support the formwork along the outer periphery of the steel truss floor deck; S6. Pour concrete into the steel truss floor slab to the designed elevation of the bottom floor slab, wait until the concrete is solidified, and then remove the formwork to complete the construction.

2. The method for constructing a closed sandwich foundation for a low-rise building on a basement roof according to claim 1, characterized in that: The step S1 comprises: After the basement bottom structure is completed, the formwork is set up on the top of the basement and the basement top slab reinforcement is tied. At the same time, retaining wall reinforcement and supporting wall reinforcement are reserved at the designed position. Concrete is poured to the designed top elevation of the basement top slab. After the concrete is solidified, the formwork is removed to complete the basement top slab construction.

3. The method for constructing a closed sandwich foundation for a low-rise building on a basement roof according to claim 2, characterized in that: The step S2 comprises: Tie the structural column reinforcement between the adjacent retaining wall reinforcements, set up the formwork and pour the concrete, wait for the concrete to solidify, remove the formwork and complete the structural column construction.

4. The method for constructing a closed sandwich foundation for a low-rise building on a basement top plate according to claim 3, characterized in that: The step S3 comprises: Formwork is jointly set up on both sides of the retaining wall reinforcement and the supporting wall reinforcement between adjacent structural columns, and concrete is poured to the designed bottom elevation of the bottom building slab. After the concrete is solidified, the formwork is removed to complete the construction of the retaining wall and the supporting wall.

5. The method for constructing a closed sandwich foundation for a low-rise building on a basement roof according to claim 1, characterized in that: The step S4 comprises: The steel truss floor deck is processed according to the position relationship of the structural columns, retaining walls and supporting walls. After processing, it is hoisted to the retaining walls and supporting walls for joint support.

6. The method for constructing a closed sandwich foundation for a low-rise building on a basement roof according to claim 1, characterized in that: In step S5, the formwork supported on the periphery of the steel truss floor deck should surround all structural columns at the same time.

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