Integrated construction method for high-variable-step raft concrete

Abstract

The invention discloses a high-variable-step raft concrete integrated construction method, and relates to the technical field of building construction. The method is implemented according to the steps of positioning and paying off, steel bar binding, inner frame installation and support throwing, concrete pouring, formwork removal and support throwing. Construction joints are reduced through integrated pouring, and the leakage risk is reduced; the ring buckle inner frame is reasonably arranged and can also serve as a top plate scaffold, and repeated operation is reduced; and the embedded steel bars are matched with the adjustable base to guarantee construction stability. The method can improve the integrity of the raft, simplify the process, shorten the period and reduce the cost, and is suitable for variable-order raft construction of high-rise building complex engineering.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, in particular to an integrated construction method for high-variable-step raft concrete. Background Art

[0002] With the rapid development of urbanization, high-rise and super-high-rise buildings, as well as large-scale underground space projects, are constantly emerging. In these complex projects, variable-step raft foundations have become a common foundation form due to their excellent integrity, high bearing capacity, and effective resistance to uneven settlement. However, traditional variable-step raft concrete construction mostly uses a staged and segmented pouring process, where the bottom raft is poured first, and the upper steps are poured only after the concrete reaches a certain strength. This construction method has numerous drawbacks: Staged construction creates a large number of construction joints, which, if not properly managed, can easily become potential sources of leakage and cracking, seriously affecting the durability and waterproofing of the structure; staged construction requires multiple formwork support and removal operations, resulting in a long construction period and high labor and material investment, significantly increasing construction costs; and multiple pours can easily lead to problems such as asynchronous concrete strength and shrinkage, which in turn adversely affect the overall load-bearing performance of the foundation structure. Therefore, an integrated construction method for high-step variable-step raft concrete is proposed. Summary of the Invention

[0003] The present invention aims to solve the above problems, thereby providing a high-variable-step raft concrete integrated construction method that reduces raft concrete leakage and improves the safety of foundation and substructure.

[0004] The present invention solves the above problems by adopting the following technical solutions: An integrated construction method for high-variable-step raft concrete is carried out in the following steps: S1. Positioning and setting out: After the brick membrane is laid, the cushion layer is constructed, the raft slab is waterproofed, and the waterproof protective layer is poured. After the waterproof protective layer is cured, the control line for the variable-step hanging formwork and the steel bar arrangement line are accurately laid out on its surface; S2. Rebar tying: Tie the upper and lower layers of the raft slab and the outer wall reinforcement in sequence, and weld the embedded reinforcement and the positioning reinforcement at the formwork after completion; S3. Install the inner frame and the castanets: lay wooden planks on top of the embedded steel bars, and build a scaffolding with a hook on top of the wooden planks. One end of the horizontal brace of the scaffolding is used to support the hanging formwork, and a castanets are set at the slope protection. S4. Concrete pouring: After the steel bars and formwork are inspected and accepted, concrete is poured in order from the bottom step to the top step; S5. Remove the formwork and the support: After the curing period of the concrete is over, remove the hanging formwork and the support, continue to tie the external wall reinforcement, and set up the full-floor scaffolding of the top plate to carry out the construction of the external wall and the top plate.

[0005] Furthermore, the said disc-locked scaffolding is arranged with two spans spaced apart in the longitudinal direction, so as to leave working space for concrete construction. After the curing period of the raft slab concrete expires, there is no need to dismantle the disc-locked scaffolding at the two spans reserved, and it can be used as the full-height scaffolding of the top slab; the inconvenience caused by the limited operating space during the construction process is reduced, so that the construction personnel can carry out the operations related to concrete pouring more smoothly; at the same time, after the curing period of the raft slab concrete expires, the reserved two-span disc-locked scaffolding does not need to be dismantled and can be used as the full-height scaffolding of the top slab; this arrangement can avoid the repeated erection and dismantling of the scaffolding, simplifies the construction process to a certain extent, and is also conducive to reducing the relevant manpower and material resources.

[0006] Furthermore, the embedded steel bars are higher than the upper surface of the raft slab by a certain height, and the wooden planks are laid on the embedded steel bars. After the raft slab concrete is cured, the height-adjustable adjustable base is adjusted upward, the wooden planks are pulled out, and then the embedded steel bars are cut. The adjustable base is then adjusted downward to drop to the upper surface of the raft slab. The wooden planks are temporarily supported by the embedded steel bars. After the raft slab concrete is cured, the adjustable base is dropped to the upper surface of the raft slab by adjusting the adjustable base, pulling out the wooden planks and cutting the embedded steel bars. This process reduces unnecessary interference to the raft slab structure and also creates conditions for the smooth progress of subsequent construction links.

[0007] Furthermore, the guy brace is a component that transmits lateral force through the cross brace of the buckle scaffolding when pouring concrete; it cooperates with the cross brace of the buckle scaffolding to form a more reasonable force transmission path. When pouring concrete, the lateral force generated can be effectively transmitted, thereby reducing the possibility of displacement and deformation of the buckle scaffolding or hanging formwork due to concentrated lateral force, which helps to maintain the stability of the structure during construction.

[0008] Compared with the prior art, the present invention adopting the above technical solution has the following outstanding features: The method disclosed in the present invention can realize the integrated construction of high-variable-step raft slab concrete, effectively improve the integrity of the variable-step raft slab; reduce the construction joints caused by staged construction, thereby greatly reducing the risk of raft slab leakage; simplify the construction process, reduce the number of times of supporting and dismantling formwork, shorten the construction period, and realize safe and efficient construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a schematic diagram of the construction of a brick membrane and a waterproof protective layer according to an embodiment of the present invention; Figure 2 1 is a schematic diagram of steel bar binding according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the inner frame and the catapult according to an embodiment of the present invention; Figure 4 This is an embodiment of the present invention Figure 3Schematic diagram of the node diagram at A in the middle; Figure 5 This is an embodiment of the present invention Figure 3 Schematic diagram of the node diagram at B in the middle; Figure 6 is a schematic diagram of concrete pouring according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the top plate inner frame erection according to an embodiment of the present invention; Marked in the figure are: waterproof protective layer 1; slope protection 2; brick membrane 3; steel bars 4; raft slab steel bars 41; exterior wall steel bars 42; embedded steel bars 43; positioning steel bars 44; inner frame 5; cross brace 51; adjustable base 52; prop 6; concrete 7; raft slab concrete 71; exterior wall concrete 72; wooden square 8; hanging formwork 9; first hanging formwork 91; second hanging formwork 92. DETAILED DESCRIPTION

[0010] The present invention will be further described below with reference to the embodiments, the purpose of which is only to provide a better understanding of the content of the present invention. Therefore, the examples given do not limit the scope of protection of the present invention.

[0011] See also Figure 1-Figure 7 A high-variable-step raft slab concrete integrated construction method is carried out in the following steps: S1, positioning and laying out: After the brick membrane 3 is completed, the cushion layer is constructed, the raft slab is waterproofed, and the waterproof protective layer 1 is poured. After the waterproof protective layer 1 is cured, the variable-step hanging formwork 9 control lines and the steel bars 4 rows are accurately laid out on its surface; S2, steel bar binding: Bind the raft slab steel bars 41, the upper and lower steel bars and the exterior wall steel bars 42 in sequence, and weld the embedded steel bars 43 and the positioning steel bars 44 at the hanging formwork 9 after completion; S3. Install the inner frame and the castanets: lay the wooden planks 8 on top of the embedded steel bars 43, and build the buckle inner frame 5 on top of the wooden planks 8. One end of the cross brace 51 of the buckle inner frame 5 is used to support the hanging formwork 9, including the first hanging formwork 91 and the second hanging formwork 92. Set the castanets 6 at the slope protection 2; S4, pouring concrete: After the steel bars 4 and the formwork have been inspected and accepted, concrete 7 is poured in order from the bottom step to the top step, including the exterior wall concrete 72 and the raft slab concrete 71; S5. Remove the formwork and the support: After the curing period of the concrete 7 is over, remove the hanging formwork 9 and the support 6, continue to tie the outer wall steel bars 42, and set up the top plate full-floor scaffolding to carry out the construction of the outer wall and the top plate. The inner disc-shaped frames 5 are arranged at intervals of two spans in the longitudinal direction to reserve working space for the construction of concrete 7. After the curing period of the raft concrete 71 expires, the inner disc-shaped frames 5 at the two spans reserved do not need to be dismantled and can be used as the full-height scaffolding of the top plate. This reduces the inconvenience caused by the limited operating space during the construction process, allowing construction workers to perform operations related to the pouring of concrete 7 more smoothly. At the same time, after the curing period of the raft concrete 71 expires, the inner disc-shaped frames 5 at the two spans reserved do not need to be dismantled and can be used as the full-height scaffolding of the top plate. This arrangement can avoid repeated erection and dismantling of scaffolding, simplifies the construction process to a certain extent, and is also conducive to reducing related manpower and material resources. The embedded steel bars 43 are 10 cm higher than the upper surface of the raft slab, and the tops of the embedded steel bars 43 are ensured to be on the same horizontal plane. The wooden beams 8 are laid on the embedded steel bars 43. After the raft slab concrete 71 is cured, the height-adjustable adjustable base 52 is adjusted upward, the wooden beams 8 are pulled out, and then the embedded steel bars 43 are cut. The adjustable base 52 is then adjusted downward to drop to the upper surface of the raft slab. The embedded steel bars 43 provide temporary support for the wooden beams 8. After the raft slab concrete 71 is cured, the adjustable base 52 is adjusted, the wooden beams 8 are pulled out, and the embedded steel bars 43 are cut, so that the adjustable base 52 drops to the upper surface of the raft slab. This process reduces unnecessary interference with the raft slab structure and also creates conditions for the smooth progress of subsequent construction links. The guy brace 6 is a component that transmits lateral force through the cross brace 51 of the inner frame 5 when pouring concrete 7; it cooperates with the cross brace 51 of the inner frame 5 to form a more reasonable force transmission path. When pouring concrete 7, the lateral force generated can be effectively transmitted, thereby reducing the possibility of displacement and deformation of the inner frame 5 or the hanging formwork 9 due to the concentration of lateral force, which helps to maintain the stability of the structure during construction. The method disclosed in the present invention can realize the integrated construction of high-variable-step raft slab concrete, effectively improve the integrity of the variable-step raft slab; reduce the construction joints caused by staged construction, thereby greatly reducing the risk of raft slab leakage; simplify the construction process, reduce the number of times of supporting and dismantling formwork, shorten the construction period, and realize safe and efficient construction.

[0012] The above description is only a preferred embodiment of the present invention and does not limit the scope of the present invention. Any equivalent changes made using the contents of the present invention specification and its drawings are included in the scope of the present invention.

Claims

1. An integrated construction method for high-variable-step raft concrete, characterized in that: Follow these steps: S1. Positioning and setting out: After the brick membrane is laid, the cushion layer is constructed, the raft slab is waterproofed, and the waterproof protective layer is poured. After the waterproof protective layer is cured, the control line of the variable-step hanging formwork and the steel bar arrangement line are accurately laid out on its surface; S2. Rebar tying: Tie the upper and lower layers of the raft slab and the outer wall reinforcement in sequence, and weld the embedded reinforcement and the positioning reinforcement at the hanging formwork after completion; S3. Install the inner frame and the castanets: lay wooden planks on top of the embedded steel bars, and build a scaffolding with a hook on top of the wooden planks. One end of the horizontal brace of the scaffolding is used to support the hanging formwork, and a castanets are set at the slope protection. S4. Concrete pouring: After the steel bars and formwork are inspected and accepted, concrete is poured in order from the bottom step to the top step; S5. Remove the formwork and the support: After the curing period of the concrete is over, remove the hanging formwork and the support, continue to tie the external wall reinforcement, and set up the full-floor scaffolding of the top plate to carry out the construction of the external wall and the top plate.

2. The integrated construction method of high-variable-step raft concrete according to claim 1, characterized in that: The two spans of the disc-locked scaffolding are arranged at intervals of two spans in the longitudinal direction to leave working space for concrete construction. After the curing period of the raft slab concrete expires, the disc-locked scaffolding at the reserved two spans does not need to be dismantled and can be used as a full-floor scaffolding for the top plate.

3. The integrated construction method of high-variable-step raft concrete according to claim 1, characterized in that: The embedded steel bars are higher than the upper surface of the raft slab by a certain height, and the wooden planks are laid on the embedded steel bars. After the raft slab concrete is cured, the adjustable base that can adjust the height is adjusted upward, the wooden planks are pulled out, and then the embedded steel bars are cut, and then the adjustable base is adjusted downward to make it fall to the upper surface of the raft slab.

4. The integrated construction method of high-variable-step raft concrete according to claim 1, characterized in that: The castor brace is a component that transmits lateral force through the cross brace of the buckled scaffolding when pouring concrete.

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