Continuous variable-order raft concrete segmented construction method
By constructing the continuous variable-step raft slab in sections and utilizing a combination of pre-buried steel bars, sleepers, and diagonal supports, the problem of unsupported formwork was solved, stable and efficient concrete pouring of the variable-step raft slab was achieved, and construction quality was improved.
Patent Information
- Application Number
- CN202511223949.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-29
- Publication Date
- 2025-10-17
AI Technical Summary
In the construction of continuously variable-step raft foundation, there is a problem that there is no effective support on the side facing the air when the formwork is installed, and the concrete is not vibrated densely.
The continuously variable-step raft slab is divided into multiple construction sections. Pre-buried steel bars and sleepers are used to disperse the lateral pressure. Diagonal supports and fastening components are combined to ensure the stability of the formwork, and concrete is poured in steps.
The safe and efficient construction of the variable-step raft slab was achieved, the stability of the formwork and the density of the concrete were improved, and the overall structural quality was enhanced.
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Figure CN120797722A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of building construction, and particularly relates to a continuous variable order raft slab concrete segmented construction method. BACKGROUND
[0002] With the acceleration of urbanization and rapid economic development, high-rise buildings, super high-rise buildings and large underground space engineering are increasing. The variable order raft foundation becomes a common foundation form of these complex engineering due to its good integrity, high bearing capacity and effective resistance to uneven settlement. Due to the complexity of the continuous variable order structure, the template cannot be effectively supported on the side of the air, and the concrete pouring is prone to be not compacted. Therefore, a continuous variable order raft concrete segmented construction method is proposed. SUMMARY
[0003] The present application aims to solve the above problems, and provides a continuous variable order raft concrete segmented construction method which can be used for safe and efficient construction of high-rise building foundation and foundation structure.
[0004] The present application solves the problem by adopting the following technical scheme: A continuous variable order raft concrete segmented construction method is performed according to the following steps: S1, positioning and setting out: after the brick membrane is built, the cushion layer, waterproof layer and waterproof protection layer are constructed, and after the maintenance is completed, the variable order formwork control line and the steel bar arrangement line are placed on the waterproof protection layer; S2, steel bar binding: the lower layer steel bar of the raft, the upper layer steel bar of the raft and the outer wall insert steel bar are sequentially bound, then a plurality of rows of exposed embedded steel bars are embedded in the predetermined section of the raft, and a waterproof steel plate is welded at a predetermined height above the raft at the variable order position; S3, pouring the second variable order flat section concrete: after the steel bar is accepted, the concrete is poured to the predetermined height of the waterproof steel plate at the second variable order position; S4, setting the second variable order formwork: after the maintenance of the second variable order flat section concrete is completed, the sleepers are laid in front of the second variable order raft embedded steel bar, the formwork and fastening members of the second variable order formwork area are installed, and the inclined support is erected; S5, pouring the second variable order formwork area concrete: after the formwork is accepted, the concrete is poured layer by layer to the predetermined height of the first variable order waterproof steel plate; S6, setting the first variable order formwork: after the maintenance of the second variable order formwork area concrete is completed, the sleepers are laid in front of the first variable order raft embedded steel bar, the formwork and fastening members of the first variable order formwork area are installed, and the inclined support is erected; S7, pouring the first variable order formwork area concrete: after the formwork is accepted, the concrete is poured layer by layer to the design elevation, and the whole raft concrete construction is completed.
[0005] Further, the embedded steel bars are arranged along the longitudinal direction at intervals, and sleepers are arranged in front of the embedded steel bars; a plurality of stable support points are provided for the formwork support, effectively resisting the lateral pressure generated during the concrete pouring process, reducing the possibility of deformation of the formwork due to stress, and ensuring the stable state of the formwork during the construction process.
[0006] Further, one end of the inclined support is on the sleeper, and the other end is against the fastening member; the formwork is tightly fixed through the joint action of the tensioning bolt and the steel pipe, preventing the formwork from expanding during the concrete pouring, and ensuring that the positional relationship between the formworks meets the construction requirements and improves the overall quality of the formwork installation.
[0007] Further, the fastening member comprises a one-way tensioning bolt and a steel pipe, one end of the tensioning bolt is anchored to the back of the formwork, and the other end is fastened to the steel pipe; the formwork is effectively supported on the side to prevent expansion.
[0008] Further, after the concrete pouring at the second variable-step formwork is completed and the curing period is over, the formwork is removed and the embedded steel bars are cut; the flatness of the raft surface is ensured, and the interference of the protruding steel bars on the subsequent construction process is eliminated.
[0009] Further, after the concrete pouring at the first variable-step formwork is completed and the curing period is over, the formwork is removed and the embedded steel bars are cut.
[0010] The application adopts the above technical scheme, and has the following outstanding features compared with the prior art: The continuous variable-step raft is divided into a plurality of reasonable construction sections, and the problem of no effective support for the formwork on the side of the air gap is effectively solved through step-by-step construction, the embedded steel bars and the sleepers are used to disperse the lateral pressure, the stability of the formwork support is ensured, the concrete vibrating operation is facilitated, the safe and efficient construction of the variable-step raft is realized, and the overall quality of the raft structure is improved. BRIEF DESCRIPTION OF DRAWINGS
[0011] Figure 1 is a brick mold membrane and waterproof protective layer construction schematic diagram of the embodiment of the application; Figure 2 is a steel bar binding schematic diagram of the embodiment of the application; Figure 3 is a pouring of the second variable-step flat section concrete schematic diagram of the embodiment of the application; Figure 4 is a second variable-step raft formwork installation schematic diagram of the embodiment of the application; Figure 5 is a node schematic diagram of the embodiment of the application Figure 4 at A; Figure 6 is a node schematic diagram of the embodiment of the application Figure 4 at B; Figure 7 is a schematic diagram of a node at C in an embodiment of the present application Figure 4 Figure 8 is a schematic diagram of pouring concrete at a second variable-order suspended form in an embodiment of the present application Figure 9 is a schematic diagram of pouring concrete at a first variable-order raft in an embodiment of the present application In the figure, the following are marked: waterproof protective layer 1; brick formwork 2; variable-order raft 3; first variable-order raft 31; second variable-order raft 32; steel bar 4; raft steel bar 41; outer wall steel bar 42; embedded steel bar 43; water stop steel plate 5; sleeper 6; inclined support 7; fastening member 8; tension bolt 81; steel pipe 82; suspended form 9; wooden square 91; formwork 92; concrete 10. DETAILED DESCRIPTION
[0012] The present application is further described below in conjunction with embodiments, the purpose of which is merely to better understand the present application, and thus the examples do not limit the protection scope of the present application.
[0013] Referring to Figures 1-9 , a continuous variable-order raft concrete segmented construction method is performed according to the following steps: S1, positioning and setting out: after the brick formwork 2 is built, the cushion layer, waterproof layer and waterproof protective layer 1 are constructed, and after the maintenance is completed, the variable-order suspended form 9 control line and steel bar 4 arrangement line are placed on the waterproof protective layer 1; S2, steel bar binding: the lower layer steel bar of the raft steel bar 41, the upper layer steel bar of the raft steel bar 41 and the outer wall steel bar 42 are sequentially bound, and then a plurality of rows of embedded steel bars 43 are embedded in the predetermined section of the variable-order raft 3, and the water stop steel plate 5 is welded at a predetermined height above the variable-order raft 3 at the variable-order position; S3, pouring concrete at a second variable-order flat section: after the steel bar 4 is accepted, the concrete 10 is poured to the predetermined height of the water stop steel plate 5 at the second variable-order raft 32; S4, setting a second variable-order formwork: after the concrete 10 at the second variable-order flat section of the raft 32 is maintained, the sleeper 6 is laid in front of the embedded steel bar 43 of the second variable-order raft 32, the formwork 92 and the fastening member 8 in the region of the second variable-order raft 32 suspended form 9 are installed, and the inclined support 7 is erected; S5, pouring concrete at a second variable-order suspended form region: after the formwork 92 is accepted, the concrete 10 is poured to the predetermined height of the water stop steel plate 5 at the first variable-order raft 31 in layers; S6, support the first variable order template: after the second variable order raft 32 hoist the mold 9 area concrete 10 maintenance ends, in the first variable order raft 31 embedded steel 43 before laying sleepers 6, install the template 92 of the first variable order raft 31 hoist the mold 9 area and fastening component 8, and erect inclined support 7; S7, pouring the first variable order hoist the mold area concrete: template 92 acceptance after qualified, layered pouring concrete 10 to the design elevation, complete the whole variable order raft 3 concrete 10 construction. The embedded steel 43 is arranged along the longitudinal direction, and sleepers 6 are arranged in front of the embedded steel 43; a plurality of stable support points are provided for the template 92 support, effectively resisting the lateral pressure generated during the pouring of concrete 10, reducing the possibility of deformation of the template 92 due to stress, and ensuring the stable state of the template 92 during construction. The inclined support 7 is supported by the sleepers 6 at one end and the fastening component 8 at the other end; through the joint action of the tensioning bolt 81 and the steel pipe 82, the template 92 is tightly fixed, preventing the template 92 from expanding during the pouring of concrete 10, and ensuring that the position relationship between the template 92 meets the construction requirements and improves the overall quality of the template 92 installation. The fastening component 8 includes a one-way tensioning bolt 81 and a steel pipe 82, one end of the tensioning bolt 81 is anchored to the back of the template 92, and the other end is fastened to the steel pipe 82; the template 92 is effectively supported on the side to prevent expansion. After the pouring of concrete 10 in the second variable order raft 32 hoist the mold 9 is completed and the maintenance period is up, the template 92 is removed and the embedded steel 43 is cut; ensure the flatness of the variable order raft 3 surface, eliminate the interference of protruding steel 4 to the subsequent construction process. After the pouring of concrete 10 in the first variable order raft 31 hoist the mold 9 is completed and the maintenance period is up, the template 92 is removed and the embedded steel 43 is cut.
[0014] The continuous variable order raft is divided into a plurality of reasonable construction sections, and the problem of no effective support on the side of the hoist mold is effectively solved by step-by-step construction, the side pressure is dispersed by embedded steel and sleepers, the stability of the template support is ensured, the concrete vibrating operation is facilitated, the safe and efficient construction of the variable order raft is realized, and the overall quality of the raft structure is improved. The above only describes the preferred embodiments of the present application, and is not limited to the scope of the present application, and any equivalent changes made by applying the content of the present application specification and its drawings are included in the scope of the present application.
Claims
1. A segmented construction method for continuously variable-step raft concrete, characterized in that: Follow these steps: S1. Positioning and laying out: After the brick membrane is laid, the cushion layer, waterproof layer and waterproof protective layer are constructed. After the curing is completed, the variable-step hanging formwork control line and steel bar arrangement line are laid on the waterproof protective layer; S2. Rebar Binding: Bind the lower layer of raft slab reinforcement, the upper layer of raft slab reinforcement and the external wall dowel bars in sequence, then embed multiple rows of exposed embedded reinforcement bars in the predetermined section of the raft slab, and weld waterstop steel plates at a preset height above the raft slab at the step change position; S3. Concrete pouring for the second step-changing straight section: After the steel bars are inspected and accepted, pour concrete to the preset height of the waterstop steel plate at the second step-changing section. S4. Supporting the second variable-step formwork: After the second variable-step straight section concrete curing is completed, lay sleepers in front of the embedded steel bars of the second variable-step raft slab, install the formwork and fastening components of the second variable-step hanging formwork area, and erect the diagonal supports; S5. Pour concrete in the second variable-step hanging formwork area: After the formwork is accepted, pour concrete in layers to the preset height of the first variable-step waterstop steel plate; S6. Supporting the first variable-step formwork: After the concrete curing of the second variable-step hanging formwork area is completed, lay sleepers in front of the embedded steel bars of the first variable-step raft slab, install the formwork and fastening components of the first variable-step hanging formwork area, and erect the diagonal supports; S7. Pour concrete in the first variable-step hanging formwork area: After the formwork is accepted, pour concrete in layers to the designed elevation to complete the overall raft slab concrete construction.
2. The segmented construction method of continuously variable-step raft concrete according to claim 1 is characterized in that: The embedded steel bars are arranged at intervals in the longitudinal direction, and sleepers are arranged in front of the embedded steel bars.
3. The segmented construction method of continuously variable-step raft concrete according to claim 1 is characterized in that: One end of the diagonal brace is against the sleeper, and the other end is against the fastening member.
4. The segmented construction method of continuously variable-step raft concrete according to claim 1 is characterized in that: The fastening component includes a one-way tension bolt and a steel pipe. One end of the tension bolt is anchored to the back rib of the template, and the other end fastens the steel pipe.
5. The segmented construction method of continuously variable-step raft concrete according to claim 1 is characterized in that: After the concrete pouring at the second-stage formwork is completed and the curing period expires, the formwork is removed and the embedded steel bars are cut.
6. The segmented construction method of continuously variable-step raft concrete according to claim 1 is characterized in that: After the concrete pouring at the first variable-step hanging formwork is completed and the curing period expires, the formwork is removed and the embedded steel bars are cut.