A construction method for the connection between the vertical component of an assembled staircase and a cast-in-place structure

Abstract

The present invention discloses a construction method for the connection between the vertical components of an assembled staircase and a cast-in-place structure, comprising: hoisting and reinforcing the lower vertical components, sealing and grouting the upper vertical components, erecting a support frame and tying the vertical steel bars at the bottom of the rest platform, supporting the rest platform and the lower wall formwork, adjusting the bolt top elevation, hoisting and reinforcing the upper vertical components, tying the steel bars at the top of the rest platform and reinforcing the formwork, acceptance, and pouring concrete. In order to reduce the risk of leakage in the exterior wall and improve the appearance quality of the finished concrete product, the present invention adopts a one-time pouring construction process to avoid construction joints caused by secondary pouring; in order to ensure the appearance quality of the concrete, the support system and formwork material are replaced on site, and after replacement, aluminum alloy formwork and a quick-disassembly system are used, which not only speeds up the on-site construction progress, but also increases the overall rigidity of the formwork; the first construction of the one-time pouring requires the superposition of two vertical components, and the aluminum alloy formwork has good rigidity and can meet the requirements of fixation and support.

Description

Technical Field

[0001] The present invention relates to a concrete pouring construction, and in particular to a construction method for a connection between a vertical component of an assembled staircase and a cast-in-place structure, belonging to the technical field of building construction. Background Art

[0002] In the construction of prefabricated and assembled integral concrete, due to the assembly rate requirements of the project and design reasons, the vertical components at the stairwell landing are located at half the height of the floor, and are connected to them by cast-in-place components on both sides. The method of leaving construction joints is used for construction on site, which increases the risk of external wall leakage and the appearance quality of the later concrete construction is poor.

[0003] According to on-site construction, the initial installation elevation of the vertical components in the stairwell is half a floor lower than the structural working floor. When the vertical components were first installed, the stair landing platform at the installation location had not yet been cast. In addition, the formwork used before the first installation of the vertical components was bamboo plywood, which has relatively low rigidity. If the vertical components are installed directly, the safety risk will be greater. Therefore, the project decided to leave construction joints on site when the vertical components in this area were first installed and cast later. However, doing so would pose risks of leakage and visual quality. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: to overcome the shortcomings of the existing technology and provide a construction method for the connection between the vertical components of prefabricated stairs and the cast-in-place structure, so that after the vertical components are installed, the elevation is half a floor higher than the structural working floor, so as to achieve the purpose of leaving no construction joints, which not only ensures the quality of the concrete construction in one time, but also reduces the safety risk and the risk of external wall leakage.

[0005] The technical solution adopted by the present invention to solve the technical problem is:

[0006] A construction method for the connection between the vertical components of an assembled staircase and a cast-in-place structure comprises the following steps:

[0007] A. Construction preparation:

[0008] ①. Measure and lay out, and calibrate the vertical reinforcement;

[0009] ②. Lay pressure strips along the upper part of the vertical components, install the bottom elevation of the wall panels, and use gaskets for leveling control;

[0010] B. Hoisting and reinforcement of lower vertical components:

[0011] ① Before hoisting the lower vertical components, the poured concrete surface should be roughened and cleaned to ensure that the secondary poured concrete or grouting material is fully integrated with the original structure;

[0012] ②. Correct the lower vertical components and reserve vertical connections to ensure that the upper vertical structure can be hoisted smoothly;

[0013] ③ After the lower vertical components are hoisted into place, adjust their position and verticality and reinforce them in time;

[0014] C. Binding of vertical reinforcement and support of the wall formwork at the bottom of the rest platform:

[0015] ① After 24 hours of grouting of the lower vertical components, tie the steel bars at the cast-in-place parts on both sides of the vertical components. The tying height should be higher than the rest platform.

[0016] ② After the steel bars are tied, they will be inspected and accepted. After the inspection is qualified, the aluminum formwork and the aluminum alloy formwork of the rest platform will be constructed at that location;

[0017] D. Adjust the bolt top elevation:

[0018] After the aluminum alloy formwork of the stairwell rest platform is supported and reinforced, the bolts and nuts of the lower vertical components are adjusted to 20mm above the upper surface of the rest platform structure. If the bolts are higher than the upper surface, they should be cut off with tools and fixed with spot welding.

[0019] E. Hoisting and reinforcement of upper vertical components:

[0020] ①. Hoist the upper vertical components and slowly hoist them to the required position. The weight of the components is borne by the bolts.

[0021] ② Pour the inclined support fixing embedded parts into the cast-in-place floor slab in advance. When the concrete strength reaches the required level, use rigid inclined supports to connect and adjust the verticality of the upper vertical components.

[0022] F. Binding of steel bars and formwork reinforcement on the upper part of the rest platform

[0023] After the upper vertical components are reinforced and corrected, start tying the steel bars on both sides of the upper vertical components. After the tying is completed, the formwork is supported and reinforced. During this process, the upper vertical components are corrected for the second time to ensure the stability and verticality of the components.

[0024] G. Concrete pouring:

[0025] After the upper vertical components and the lower vertical components are hoisted, a K-plate is set on the outside of the connection between the upper vertical components and the lower vertical components, and through-wall bolts are passed through the K-plate, the vertical components, and the aluminum alloy formwork to fix them.

[0026] Use a lifting beam to lift the component vertically. When the component is lifted to the operating surface, use the bottom positioning device and manual assistance to lift the component to the installation position, and ensure its bottom is stable and horizontal so that the reserved steel bars can be inserted into the grouting sleeve.

[0027] The vertical component is composed of an upper component and a lower component, and each component is composed of a component body, vertical connecting steel bars, a first embedded bolt, a second embedded bolt, an oblique support sleeve, a horizontal steel bar, a grouting hole and an integrated insulation board. The side walls of the component body are evenly provided with vertical connecting steel bars, the top of the component body is provided with embedded bolts, the bottom of the upper end surface of the component body is provided with a grouting hole, and the upper middle part of the upper end surface of the component body is provided with an oblique support sleeve.

[0028] The vertical connecting steel bars are vertically distributed on the side surfaces of the component body.

[0029] The upper and lower end surfaces of the component body are respectively provided with integrated insulation plates.

[0030] A keyway is provided on the side surface of the component body.

[0031] The positive beneficial effects of the present invention are:

[0032] 1. The present invention realizes the integral pouring connection between prefabricated vertical components and cast-in-place structures by replacing the construction sequence of vertical components and concrete pouring, avoids leaving construction joints on the exterior walls, improves the quality of concrete construction, reduces the risk of exterior wall leakage, and also ensures the visual quality of concrete.

[0033] 2. The present invention achieves the purpose of connecting the vertical components of the stairwell with the floors by pouring them in one go by making the elevation of the vertical components half a floor higher than the structural working floor after installation; firstly, the vertical components are half a floor higher than the working floor, which plays the role of edge protection and saves the safety protection cost here; secondly, the connection between the vertical components and the concrete is poured in one go, reducing the visual quality risk of secondary concrete pouring; thirdly, no construction joints are added at the concrete connection, which effectively avoids the risk of leakage in the vertical joints of the exterior wall and can ensure that the construction is completed in one go.

[0034] 3. The present invention not only speeds up the on-site construction progress but also increases the overall rigidity of the formwork by replacing the support system and formwork material; the initial construction of a single pour requires the superposition of two vertical components, and the aluminum alloy formwork has better rigidity and can meet the requirements of fixation and support. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of the vertical component of the present invention;

[0036] Figure 2 for Figure 1 Cross-sectional view of AA;

[0037] Figure 3 for Figure 1 Cross-sectional view of the middle BB;

[0038] Figure 4It is a plan view of the hoisting of the vertical component of the present invention;

[0039] Figure 5 for Figure 4 Cross-section of the middle AA;

[0040] Among them: 1-vertical connecting steel bar, 2-first embedded bolt, 3-second embedded bolt, 4-inclined support sleeve, 5-horizontal steel bar, 6-grouting hole, 7-integrated insulation board, 8-keyway, 9-through-wall bolt, 10-K plate, 11-resting platform, 12-aluminum alloy formwork, 13-inclined support, 14-inclined support fixing embedded parts, 15-support rod, A-vertical component. DETAILED DESCRIPTION

[0041] The present invention will be further explained and illustrated below with reference to the accompanying drawings:

[0042] For example, see Figure 1-Figure 5 A construction method for the connection between the vertical components of an assembled staircase and a cast-in-place structure comprises the following steps:

[0043] A. Construction preparation:

[0044] ①. Measure and lay out, and calibrate the vertical reinforcement;

[0045] ②. Lay pressure strips along the upper part of the vertical components, install the bottom elevation of the wall panels, and use gaskets for leveling control;

[0046] B. Hoisting and reinforcement of lower vertical components:

[0047] ① Before hoisting the lower vertical components, the poured concrete surface should be roughened and cleaned to ensure that the secondary poured concrete or grouting material is fully integrated with the original structure;

[0048] ②. Correct the lower vertical components and reserve vertical connections to ensure that the upper vertical structure can be hoisted smoothly;

[0049] ③ After the lower vertical components are hoisted into place, adjust their position and verticality and reinforce them in time;

[0050] C. Binding of vertical reinforcement and support of the wall formwork at the bottom of the rest platform:

[0051] ① After 24 hours of grouting of the lower vertical components, tie the steel bars at the cast-in-place parts on both sides of the vertical components. The tying height should be higher than the rest platform.

[0052] ② After the steel bars are tied, they will be inspected and accepted. After the inspection is qualified, the aluminum formwork and the aluminum alloy formwork of the rest platform will be constructed at that location;

[0053] D. Adjust the bolt top elevation:

[0054] After the aluminum alloy formwork of the stairwell rest platform is supported and reinforced, the bolts and nuts of the lower vertical components are adjusted to 20mm above the upper surface of the rest platform structure. If the bolts are higher than the upper surface, they should be cut off with tools and fixed with spot welding.

[0055] E. Hoisting and reinforcement of upper vertical components:

[0056] ①. Hoist the upper vertical components and slowly hoist them to the required position. The weight of the components is borne by the bolts.

[0057] ② Pour the inclined support fixing embedded parts into the cast-in-place floor slab in advance. When the concrete strength reaches the required level, use rigid inclined supports to connect and adjust the verticality of the upper vertical components.

[0058] F. Binding of steel bars and formwork reinforcement on the upper part of the rest platform

[0059] After the upper vertical components are reinforced and corrected, start tying the steel bars on both sides of the upper vertical components. After the tying is completed, the formwork is supported and reinforced. During this process, the upper vertical components are corrected for the second time to ensure the stability and verticality of the components.

[0060] G. Concrete pouring:

[0061] Concrete pouring can only be carried out after all work is completed and accepted; during the concrete pouring process, pay attention to the quality of concrete pouring between the upper and lower vertical components and on both sides, and ensure that the concrete is vibrated and poured in place; the concrete elevation between the upper and lower vertical components is flush with the top of the rest platform.

[0062] In the above description, after the upper vertical components and the lower vertical components are hoisted, a K-plate is set on the outside of the connection between the upper vertical components and the lower vertical components, and through-wall bolts are passed through the K-plate, the vertical components, and the aluminum alloy formwork and fixed.

[0063] In the above description, a lifting beam is used to lift the component vertically. When the component is lifted to the operating surface, the bottom positioning device and manual assistance are used to lift the component to the installation position, and its bottom is ensured to be stable and horizontal so that the reserved steel bars can be inserted into the grouting sleeve.

[0064] In the above description, fast-hardening high-strength mortar is used to seal the bottom joints of the prefabricated wall panels (lower vertical components) around the perimeter to ensure that they are dense and reliable; the grouting method is used to grout from the lower port of the grouting partition, and when the slurry flows out from other holes, it is sealed in time. After the grouting of the entire wall section is completed, the outflowing slurry is cleaned.

[0065] The vertical components are composed of upper components and lower components, and each component is composed of a component body, vertical connecting steel bars, a first embedded bolt, a second embedded bolt, an inclined support sleeve, a horizontal steel bar, a grouting hole and an integrated insulation board. Vertical connecting steel bars are evenly arranged on the side walls of the component body, embedded bolts are arranged on the top of the component body, grouting holes are arranged at the bottom of the upper end face of the component body, and an inclined support sleeve is arranged in the middle and upper part of the upper end face of the component body.

[0066] The vertical connecting steel bars are distributed vertically on the sides of the component body.

[0067] Integrated thermal insulation panels are respectively provided on the upper and lower end surfaces of the component body.

[0068] A keyway is provided on the side surface of the component body.

[0069] In the above description, when adjusting the verticality of the vertical component, it is necessary to fix the embedded parts on the ground of the stairwell, connect the lower end of the inclined support to the fixed embedded parts, and connect the upper end of the inclined support to the inclined support sleeve on the outside of the component; in this process, there are at least two inclined supports, and the upper supporting components and the lower supporting components are adjusted respectively.

[0070] In the above description, there are at least two support rods, which are used to support the formwork outside the rest platform. After the stairs are all cast, the vertical rods need to be removed.

[0071] In order to reduce the risk of external wall leakage and improve the appearance quality of the finished concrete product, the present invention adopts a one-time pouring construction process to avoid construction joints caused by secondary pouring; to ensure the appearance quality of the concrete, the support system and formwork material are replaced on site. After the replacement, aluminum alloy formwork and quick-disassembly system are used, which not only speeds up the on-site construction progress, but also increases the overall rigidity of the formwork; the first construction of one-time pouring requires the superposition of two vertical components. The aluminum alloy formwork has good rigidity and can meet the requirements of fixation and support.

Claims

1. A construction method for the connection between the vertical components of an assembled staircase and a cast-in-place structure, characterized in that: The steps include: A. Construction preparation: ①. Measure and lay out, and calibrate the vertical reinforcement; ② Lay pressure strips along the upper part of the vertical components and use gaskets to level the bottom of the wall panels to ensure that the elevation of the bottom of the wall panels meets the design requirements; B. Hoisting and reinforcement of lower vertical components: ① Before hoisting the lower vertical components, the poured concrete surface should be roughened and cleaned to ensure that the secondary poured concrete or grouting material is fully integrated with the original structure; ②. Correct the lower vertical components and reserve vertical connections to ensure that the upper vertical structure can be hoisted smoothly; ③ After the lower vertical components are hoisted into place, adjust their position and verticality and reinforce them in time; C. Binding of vertical reinforcement and support of the wall formwork at the bottom of the rest platform: ① After 24 hours of grouting of the lower vertical components, tie the steel bars at the cast-in-place parts on both sides of the vertical components. The tying height should be higher than the rest platform. ② After the steel bars are tied, they will be inspected and accepted. After the inspection is qualified, the aluminum formwork and the aluminum alloy formwork of the rest platform will be constructed at that location; D. Adjust the bolt top elevation: After the aluminum alloy formwork of the stairwell rest platform is supported and reinforced, the bolts and nuts of the lower vertical components are adjusted to 20mm above the upper surface of the rest platform structure. If the bolts are higher than the upper surface, they should be cut off with tools and fixed with spot welding. E. Hoisting and reinforcement of upper vertical components: ①. Hoist the upper vertical components and slowly hoist them to the required position. The weight of the components is borne by the bolts. ② Pour the inclined support fixing embedded parts into the cast-in-place floor slab in advance. When the concrete strength reaches the required level, use rigid inclined supports to connect and adjust the verticality of the upper vertical components. F. Binding of steel bars and formwork reinforcement on the upper part of the rest platform After the upper vertical components are reinforced and corrected, start tying the steel bars on both sides of the upper vertical components. After the tying is completed, the formwork is supported and reinforced. During this process, the upper vertical components are corrected for the second time to ensure the stability and verticality of the components. G. Concrete pouring: Concrete pouring can only be carried out after all work is completed and accepted; during the concrete pouring process, pay attention to the quality of concrete pouring between the upper and lower vertical components and on both sides, and ensure that the concrete is vibrated and poured in place; the concrete elevation between the upper and lower vertical components is flush with the top of the rest platform.

2. The construction method for the connection between the vertical component of the assembled staircase and the cast-in-place structure according to claim 1 is characterized by: After the upper vertical components and the lower vertical components are hoisted, a K-plate is set outside the connection between the upper vertical components and the lower vertical components, and through-wall bolts are passed through the K-plate, the vertical components, and the aluminum alloy formwork to fix them.

3. The construction method for the connection between the vertical component of the assembled staircase and the cast-in-place structure according to claim 1 is characterized in that: It also includes the following steps: using a lifting beam to vertically lift the component; when the component is lifted to the operating surface, using a bottom positioning device and manual assistance to lift the component to the installation position, and ensuring its bottom is stable and horizontal, so that the reserved steel bars are inserted into the grouting sleeve.

4. The construction method for the connection between the vertical component of the assembled staircase and the cast-in-place structure according to claim 1 is characterized in that: It also includes the following steps: using fast-hardening high-strength mortar to seal the bottom joints of the vertical components around the perimeter to ensure that they are dense and reliable; using the grouting method to grout from the bottom of the grouting partition, and sealing it in time when the slurry flows out from other holes. After completing the grouting of the entire wall section, clean up the outflowing slurry.

5. The construction method for the connection between the vertical component of the assembled staircase and the cast-in-place structure according to claim 1 is characterized by: The vertical component is composed of an upper component and a lower component, and each component is composed of a component body, vertical connecting steel bars, a first embedded bolt, a second embedded bolt, an oblique support sleeve, a horizontal steel bar, a grouting hole and an integrated insulation board. The side walls of the component body are evenly provided with vertical connecting steel bars, the top of the component body is provided with embedded bolts, the bottom of the upper end surface of the component body is provided with a grouting hole, and the upper middle part of the upper end surface of the component body is provided with an oblique support sleeve.

6. The construction method for the connection between the vertical components of an assembled staircase and the cast-in-place structure according to claim 5 is characterized by: The vertical connecting steel bars are vertically distributed on the side surfaces of the component body.

7. The construction method for the connection between the vertical components of an assembled staircase and the cast-in-place structure according to claim 5 is characterized by: The upper and lower end surfaces of the component body are respectively provided with integrated insulation plates.

8. The construction method for the connection between the vertical components of an assembled staircase and the cast-in-place structure according to claim 5 is characterized by: A keyway is provided on the side surface of the component body.

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