Vertical construction joint formwork structure of flat concrete structure and construction method

Abstract

The invention discloses a slab concrete structure vertical construction joint formwork structure and a construction method. The slab concrete structure vertical construction joint formwork structure comprises a steel bar grid and an air bag. The steel bar grids comprise a top steel bar grid and a bottom steel bar grid which are arranged at the position of the slab concrete structure to be constructed; after the air bags are inflated, the upper ends of the air bags are clamped by the steel bar grid at the top, and the lower ends of the air bags are clamped by the steel bar grid at the bottom; side pressure generated during concrete pouring is borne through the rigidity formed by extrusion of the inflatable air bags and the supporting effect of the steel bar grids on the inflatable air bags. The method is simple and flexible, only the air bags need to be placed in the steel bar grids at the construction joints and are filled with air, concrete is prevented from overflowing in the pouring process, the problem that the construction joint formworks are difficult to support and disassemble during flat plate concrete structure construction is well solved, the construction efficiency of the construction joint formworks is improved, the construction progress is optimized, and the construction cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear power construction, and in particular to a vertical construction joint template structure of a flat concrete structure and a construction method. Background Art

[0002] With the development of economy, the demand for energy is getting higher and higher, which makes nuclear power construction have a broad development space and scale. There are a lot of plate structures inside nuclear power, and the plate structures are large in size. In order to ensure the construction quality, they need to be poured in sections for many times, which will form a lot of construction joints.

[0003] Traditional construction joints generally use wire mesh templates, which are usually composed of double-layer galvanized wire mesh, plastic film, steel bars, steel pipes, wooden squares, etc., and are generally made on site. This type of construction joint template is difficult to set up and dismantle, and it takes a long time, which will affect the construction progress and increase the construction cost. Summary of the invention

[0004] The purpose of the present invention is to provide a vertical construction joint template structure and a construction method for a flat concrete structure, which utilizes the characteristics of airbag inflation and deflation to flexibly solve the on-site construction joint template problem.

[0005] To achieve the above purpose, the technical solution provided by the present invention is:

[0006] The first aspect of the present application provides a vertical construction joint template structure for a flat concrete structure, comprising a steel grid and an air bag; the steel grid comprises a top steel grid and a bottom steel grid arranged at the flat concrete structure to be constructed; the air bag is vertically placed in the steel grid, and after the air bag is inflated, the upper end is clamped by the top steel grid and the lower end is clamped by the bottom steel grid; the rigidity formed by the extrusion of the inflated air bag and the supporting effect of the steel grid on the inflated air bag are used to withstand the lateral pressure generated during concrete pouring.

[0007] To optimize the above technical solutions, the specific measures taken also include:

[0008] It also includes a reinforcement support system, which includes a support keel and an oblique support structure. The support keel is arranged on the side of the airbag away from concrete pouring, and the support keel is supported on the bottom mold through the oblique support structure.

[0009] The supporting keel comprises a supporting secondary keel and a supporting main keel, the supporting main keel is arranged vertically, and the supporting secondary keel is arranged between the airbag and the supporting main keel.

[0010] The diagonal bracing structure includes an adjustable top brace, a scaffolding steel pipe and an adjustable base. The adjustable top brace is installed on the scaffolding steel pipe, and the scaffolding steel pipe is installed on the adjustable base. The upper end of the adjustable top brace supports the supporting keel, and the adjustable base is arranged on the bottom mold.

[0011] Additional vertical reinforcing steel bars are arranged on the bottom mold at a side of the adjustable base away from the airbag to provide supporting force to support the adjustable base.

[0012] Furthermore, the airbag is a flexible cylindrical gas rod that can be inflated and deflated; preferably, the material of the airbag is an airtight PVC cloth mesh.

[0013] Furthermore, two airbags are placed in a single steel mesh. After being inflated, the two airbags squeeze each other and fill the steel mesh. When a single airbag is in an independent state filled with air, its diameter is not less than 1 / 2 of the maximum distance from the center of the steel mesh to the edge.

[0014] After the airbag is inflated, the top of the airbag is not less than 200mm above the top of the board.

[0015] A second aspect of the present application provides a construction method for a vertical construction joint formwork structure of a flat concrete structure, comprising the following steps:

[0016] Install bottom embedded parts, tie flat steel bars to form a steel bar grid including a top steel bar grid and a bottom steel bar grid, and install top embedded parts;

[0017] Place two uninflated air bags in parallel into the tied steel bar grid on the side where the concrete is to be poured;

[0018] Inflate the two air bags so that they press against each other and fill the steel mesh;

[0019] A reinforcement support system is provided on the side of the airbag away from the concrete pouring;

[0020] Slab concrete pouring;

[0021] After the concrete reaches initial setting, the air bag is removed by deflating.

[0022] Furthermore, after the initial setting of the concrete, the airbag can be removed by deflating, and the concrete surface at the construction joint can be roughened by punching or chiseling.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The airbag support system of the present invention is easy to install and disassemble. When the airbag is used, it only needs to be placed in the steel grid for inflation and deflation. Furthermore, a reinforced support system can be installed on the side of the airbag, and the support structure is simple and the effect is good.

[0025] After the airbag is removed, it can be cleaned with water and reused, with a high turnover utilization rate.

[0026] The damaged part of the airbag can be repaired with Velcro, which is a simple and quick repair method.

[0027] The invention has been tested on site, and the quality is reliable and guaranteed, and it is convenient and flexible.

[0028] In short, the method of the present invention can effectively ensure the quality of the construction joint, properly solve the problem of the difficulty in supporting and dismantling the construction joint formwork, optimize the construction progress, and solve the problem of the difficulty in supporting and dismantling the construction joint formwork and the inability to reuse it. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the structure of the airbag used in the present invention.

[0030] Figure 2 It is a schematic diagram of the construction of the vertical construction joint formwork of the flat concrete structure of the present invention.

[0031] Figure 3 This is a schematic diagram of the reinforcement of the vertical construction joint formwork of a flat plate structure with a thickness of no more than 500mm.

[0032] Figure 4 Schematic diagram of the vertical construction joint formwork reinforcement for flat plate structures with a thickness greater than 500mm.

[0033] In the figure: 1-airbag, 1-1 air valve, 1-2 airbag body; 2-structural steel bars; 3-reinforcement support system, 3-1 supporting secondary keel, 3-2 supporting main keel, 3-3 adjustable top support, 3-4 scaffolding steel pipe, 3-5 adjustable base; 4-additional vertical reinforcement steel bars; 5-mortar pads; 6-floor bottom formwork system, 6-1 bottom formwork template, 6-2 bottom formwork secondary keel, 6-3 bottom formwork main keel. DETAILED DESCRIPTION

[0034] The above contents of the present invention are further described in detail below in the form of embodiments, but this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the above contents of the present invention belong to the scope of the present invention.

[0035] The present application provides a vertical construction joint formwork structure for a flat concrete structure, such as Figure 2-4 As shown, it includes a steel bar grid and an airbag 1; the steel bar grid includes a top steel bar grid and a bottom steel bar grid 2 which are arranged at the flat concrete structure to be constructed; the airbag 1 is vertically placed in the steel bar grid 2, and after the airbag 1 is inflated, the upper end is clamped by the top steel bar grid 2, and the lower end is clamped by the bottom steel bar grid 2; the rigidity formed by the extrusion of the inflated airbag 1 and the supporting effect of the steel bar grid 2 on the inflated airbag 1 are used to withstand the lateral pressure generated during concrete pouring.

[0036] It also includes a reinforcement support system 3, which includes a support keel and an oblique support structure. The support keel is arranged on the side of the airbag 1 away from the concrete pouring, and the support keel is supported on the bottom mold through the oblique support structure.

[0037] like Figure 1 As shown, the airbag 1 includes an air valve 1-1 and an airbag body 1-2.

[0038] Preferably, the airbag 1 is a flexible cylindrical gas rod that can be inflated and deflated; the material of the airbag 1 is an airtight PVC cloth mesh, and the side of the airbag 1 is a plane.

[0039] The supporting keel includes a supporting secondary keel 3-1 and a supporting main keel 3-2. The supporting main keel 3-2 is vertically arranged and parallel to the side of the airbag 1. The supporting secondary keel 3-1 is arranged between the airbag 1 and the supporting main keel 3-2.

[0040] The diagonal bracing structure includes an adjustable top brace 3-3, a scaffolding steel pipe 3-4 and an adjustable base 3-5. The adjustable top brace 3-3 is installed on the scaffolding steel pipe 3-4, and the scaffolding steel pipe 3-4 is installed on the adjustable base 3-5; the upper end of the adjustable top brace 3-3 supports the supporting keel, and the adjustable base 3-5 is set on the bottom mold.

[0041] An additional vertical reinforcing steel bar 4 is arranged on the bottom mold at a side of the adjustable base 3-5 away from the airbag 1 to provide a supporting force to support the adjustable base 3-5.

[0042] Two airbags 1 are placed in a single steel mesh 2. After the two airbags 1 are inflated, they squeeze each other and fill the steel mesh 2. When a single airbag 1 is inflated and independent, its diameter is not less than 1 / 2 of the maximum distance from the center of the steel mesh 2 to the edge.

[0043] After the airbag 1 is inflated, the top of the airbag 1 is not less than 200mm above the top of the board.

[0044] The present application also provides a construction method for a vertical construction joint formwork structure of a flat concrete structure, comprising the following steps:

[0045] Install the embedded parts at the bottom of the floor slab, tie the flat steel bars to form a steel bar grid 2 including a top steel bar grid 2 and a bottom steel bar grid 2, and install the embedded parts at the top of the floor slab;

[0046] Place two uninflated air bags 1 in parallel into the tied steel bar grid 2;

[0047] Inflate the two air bags 1 so that the two air bags 1 squeeze each other and fill the steel mesh 2;

[0048] A reinforcement support system 3 is provided on the side of the airbag 1 away from the concrete pouring;

[0049] Slab concrete pouring;

[0050] After the concrete has initially set, the air bag 1 is removed by deflation.

[0051] After taking out the airbag 1, the concrete surface at the construction joint is roughened by punching or chiseling.

[0052] The present invention is further described in detail below in conjunction with specific embodiments:

[0053] The vertical construction joint formwork structure construction of a flat concrete structure of a nuclear power construction site, the construction steps are as follows:

[0054] Step 1: Select the appropriate specification of the airbag 1 according to the thickness of the plate and the size of the steel mesh 2;

[0055] Step 2: Lay out the positions of the flat plate reinforcement and the embedded parts at the bottom of the floor slab;

[0056] Step 3: Install the embedded parts at the bottom of the floor slab and tie the flat steel bars;

[0057] Step 4: Lay out the positions of the embedded items on the top of the floor slab;

[0058] Step 5: Install the embedded items in the floor slab according to the design drawings, such as embedded parts, embedded casings and other facilities such as reserved hole boxes, etc.;

[0059] Step 6: Lay out the position of the slab construction joint;

[0060] Step 7: Place the uninflated airbag 1 into the tied steel mesh 2 according to the laying-out position, and place two airbags 1 into a single mesh;

[0061] Step 8: Inflate the airbags 1 so that they squeeze each other and fill the steel mesh 2 to prevent the concrete from overflowing during pouring; and add a reinforcement support system 3 based on the slab thickness:

[0062] Step 9: After the initial setting of the concrete, the airbag 1 is deflated and shrunk, and then it is pulled out, and the concrete surface at the construction joint is roughened by punching or chiseling.

[0063] like Figure 1 As shown, in the specific embodiment, a mortar pad 5 is provided between the flat concrete structure and the floor bottom formwork system 6; the floor bottom formwork system 6 is composed of a bottom formwork template 6-1, a bottom formwork secondary keel 6-2 and a bottom formwork main keel 6-3.

[0064] like Figure 2 As shown, two air bags 1 are placed in a steel mesh 2, which are squeezed and filled with the steel mesh 2 after being inflated.

[0065] The airbag is inflated with a small air cylinder or a small air pump to fill the steel grid, and the mutual squeezing state makes it have a certain load-bearing capacity. After field experiments, the construction quality is reliably guaranteed, convenient and flexible.

[0066] like Figure 3As shown, when the thickness of the slab is not greater than 500 mm, the construction joint template only uses the rigidity formed by the extrusion of the airbag 1 after inflation and the support of the steel grid 2 to withstand the lateral pressure generated during concrete pouring, and no additional reinforcing diagonal braces are provided.

[0067] like Figure 4 As shown, when the thickness of the slab is greater than 500 mm, primary and secondary keels and steel pipe diagonal braces are added to the outside of the airbag 1, and the density of the reinforced support system 3 is determined by calculation in combination with the concrete side pressure during pouring. Figure 4 The steel pipe diagonal brace reinforcement shown in the figure can also be replaced by a high-strength tie rod and matching fasteners plus a pull ring for reinforcement.

[0068] After the airbag 1 is removed, it can be washed with water and reused again, and the turnover utilization rate is high. The damaged part of the airbag 1 can be pasted with Velcro, and the repair method is simple and fast.

[0069] The above are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Any technician familiar with the profession, without departing from the scope of the technical solution of the present invention and based on the technical essence of the present invention, may make any simple modifications, equivalent substitutions and improvements to the above embodiments, which are still within the protection scope of the technical solution of the present invention.

Claims

1. A vertical construction joint formwork structure for a flat concrete structure, characterized in that: It includes a steel bar grid and an air bag; the steel bar grid includes a top steel bar grid and a bottom steel bar grid arranged at the flat concrete structure to be constructed; the air bag is vertically placed in the steel bar grid, and after the air bag is inflated, the upper end is clamped by the top steel bar grid and the lower end is clamped by the bottom steel bar grid; the rigidity formed by the extrusion of the inflated air bag and the supporting effect of the steel bar grid on the inflated air bag are used to withstand the lateral pressure generated during concrete pouring.

2. The vertical construction joint formwork structure of a flat concrete structure according to claim 1, characterized in that: It also includes a reinforcement support system, which includes a support keel and an oblique support structure. The support keel is arranged on the side of the airbag away from concrete pouring, and the support keel is supported on the bottom mold through the oblique support structure.

3. The vertical construction joint formwork structure of a flat concrete structure according to claim 2, characterized in that: The supporting keel comprises a supporting secondary keel and a supporting main keel, the supporting main keel is arranged vertically, and the supporting secondary keel is arranged between the airbag and the supporting main keel.

4. The vertical construction joint formwork structure of a flat concrete structure according to claim 2, characterized in that: The diagonal bracing structure includes an adjustable top brace, a scaffolding steel pipe and an adjustable base. The adjustable top brace is installed on the scaffolding steel pipe, and the scaffolding steel pipe is installed on the adjustable base. The upper end of the adjustable top brace supports the supporting keel, and the adjustable base is arranged on the bottom mold.

5. The vertical construction joint formwork structure of a flat concrete structure according to claim 4, characterized in that: Additional vertical reinforcing steel bars are arranged on the bottom mold at a side of the adjustable base away from the airbag to provide supporting force to support the adjustable base.

6. The vertical construction joint formwork structure of a flat concrete structure according to claim 1, characterized in that: The airbag is a flexible cylindrical gas rod that can be inflated and deflated; the material of the airbag is an airtight PVC cloth-reinforced net.

7. The vertical construction joint formwork structure of a flat concrete structure according to claim 1, characterized in that: Two airbags are placed in a single steel mesh. After being inflated, the two airbags squeeze each other and fill the steel mesh. When a single airbag is inflated and independent, its diameter is not less than 1 / 2 of the maximum distance from the center of the steel mesh to the edge.

8. The vertical construction joint formwork structure of a flat concrete structure according to claim 1, characterized in that: After the airbag is inflated, the top of the airbag is not less than 200mm above the top of the board.

9. The construction method of the vertical construction joint template structure of the flat concrete structure according to any one of claims 1 to 8, characterized in that: The following steps are involved: Install bottom embedded parts, tie flat steel bars to form a steel bar grid including a top steel bar grid and a bottom steel bar grid, and install top embedded parts; Place two uninflated air bags in parallel into the tied steel bar grid on the side where the concrete is to be poured; Inflate the two air bags so that they press against each other and fill the steel mesh; A reinforcement support system is provided on the side of the airbag away from the concrete pouring; Slab concrete pouring; After the concrete reaches initial setting, the air bag is removed by deflating.

10. The construction method of the vertical construction joint template structure of the flat concrete structure according to claim 9, characterized in that: After removing the air bag, the concrete surface at the construction joint should be roughened by punching or chiseling.

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