CN107327050B - Disassembly-free basement exterior wall flanging unilateral formwork supporting device and construction method - Google Patents

Abstract

The invention discloses a dismantling-free basement exterior wall flanging single-side formwork support device and a construction method. The device comprises a prefabricated concrete slab, a prefabricated concrete U-shaped slab, a straight-shaped connecting steel plate, an L-shaped connecting steel plate, an iron wire, Sheep eye bolts and nuts, the construction method is as follows: release the precast concrete sheet positioning line on the raft steel bar, adjust the raft steel bar closest to the outside of the precast concrete sheet and place it on the precast concrete sheet positioning line position; The thin plate is placed on the steel bar of the raft and is close to the steel bar of the basement exterior wall, and the in-line connecting steel plate, the L-shaped connecting steel plate and the precast concrete thin plate are fixed and connected into one piece by sheep eye bolts and nuts. Eye bolts and raft steel bars are connected; before the initial setting of the raft concrete, pour the basement exterior wall flanging concrete. By adopting the device and method of the invention, the verticality and flatness of the basement exterior wall flanging can be ensured, and the cost of erection and dismantling can be saved.

Description

One-side formwork support device and construction method for free basement exterior wall flanging

technical field

The invention belongs to the technical field of construction engineering, and in particular relates to a dismantling-free basement outdoor wall flanging single-side formwork device and a construction method.

Background technique

During the construction of the basement structure, due to site constraints, the distance between the supporting structure and the outer wall of the basement is relatively close. If there is no room for operation if double-sided formwork is used, then single-side formwork is required. During the design process of the basement exterior wall, considering the construction process, a horizontal construction joint (that is, flanging, the standard requires a height of 300 mm or more on the concrete surface of the foundation floor) will be reserved on the basement exterior wall. The traditional construction method is flanging Wooden formwork + wooden square + steel pipe reversed top formwork method is adopted. Since the single-side formwork increases the width of the pouring section (the thickness of the original basement exterior wall + the distance from the basement exterior wall to the support pile), the traditional construction method is overturned. The edge height is often determined according to the modulus of a wooden formwork (height is 900mm). In order to avoid cutting the formwork and causing waste, but because the height is too high, it is not easy to operate, easy to expand the mold, and the surface is raised after the flanging is formed. It affects the construction quality of the large-area wall unilateral formwork above the horizontal construction joint in the next process, resulting in uneven joints at the construction joint after the concrete pouring of the basement exterior wall is formed, and the verticality of the wall does not meet the requirements.

Contents of the invention

The object of the present invention is to provide a non-dismantling basement outdoor wall flanging single-side formwork device, the device is prefabricated by concrete, the surface is flat, and has sufficient rigidity, the surface will not be deformed, and the device is equivalent to the basement The outer wall reinforcement protection layer can effectively control the verticality of the basement outer wall flanging and ensure the quality of the next process.

Another object of the present invention is to provide a non-demolition-free basement exterior wall flanging single-side formwork construction method. The construction method is simple and quick, and can effectively ensure the verticality and flatness of the precast concrete slabs after assembly. During the process, the assembled prefabricated concrete thin slabs are affected by the concrete lateral pressure, and the joints will not be deformed.

In order to achieve the above object, the present invention adopts the following technical solutions:

A dismantling-free basement exterior wall flanging single-side formwork support device, including precast concrete slabs, precast concrete U-shaped slabs, in-line connecting steel plates, L-shaped connecting steel plates, iron wires, eye bolts, nuts, and precast concrete slabs. The space is connected by a straight connecting steel plate, the precast concrete slab and the precast concrete U-shaped plate are connected by an L-shaped connecting steel plate, and the straight connecting steel plate, L-shaped connecting steel plate and precast concrete slab, The concrete U-shaped slab is fixed and connected into one piece, one end of the iron wire is fixedly connected with the eyebolt, and the other end is connected with the steel bar of the raft, and the precast concrete slab and the precast concrete U-shaped slab are vertically fixed.

A non-demolition-free basement exterior wall flanging single-side formwork construction method, the steps of which are:

1) Lay out the positioning line of the precast concrete sheet on the raft steel bar, adjust the binding of a raft steel bar closest to the outside of the precast concrete sheet and place it on the position of the positioning line of the precast concrete sheet, and use it as the positioning steel bar of the precast concrete sheet to prevent the precast concrete sheet from happening. displacement;

2) Precast concrete thin slabs are divided into precast concrete slabs and precast concrete U-shaped slabs. Place the precast concrete U-shaped slabs on the raft steel bars and close to the frame columns, and then place the precast concrete slabs on the raft steel bars and close to the basement For external wall reinforcement, support reinforcement is provided directly under the precast concrete thin slab. The precast concrete U-shaped slab and the precast concrete slab are connected by an L-shaped connecting steel plate, and the precast concrete slabs are connected by an in-line connecting steel plate. Fix and connect the in-line connecting steel plate, L-shaped connecting steel plate and prefabricated concrete sheet with nuts;

3) After the connection of the precast concrete sheet is completed, one end of the iron wire is fixedly connected with the eyebolt, and the other end is connected with the steel bar of the raft, and the precast concrete sheet and the steel bar of the raft are fixed by the iron wire, and the precast concrete sheet is adjusted to be vertical;

4) The raft concrete is poured first, and before the initial setting of the raft concrete, the flanging concrete of the basement exterior wall is poured.

In the non-demolition-free basement external wall flanging single-side formwork construction method, preferably, the height of the prefabricated concrete thin slab is equal to the height of the horizontal construction joint + the thickness of the raft reinforcement protective layer.

In the non-demolition-free basement exterior wall flanging single-side formwork construction method, preferably, the thickness of the prefabricated concrete thin slab is equal to the thickness of the steel bar protection layer of the basement exterior wall.

Compared with prior art, advantage and beneficial effect of the present invention are:

1. The thickness of the prefabricated concrete slab is 30-50mm, which is equal to the thickness of the protective layer of the steel bar of the basement exterior wall. After the pouring is completed, it is integrated with the structure, and no additional demolition is required, which saves the cost of formwork, wood and steel pipe materials in the traditional support system. erection and dismantling costs.

2. The surface of the prefabricated concrete slab is smooth, and the concrete will not bulge after the installation is firm, ensuring the construction quality of the large-area single-side formwork above the horizontal construction joints of the basement exterior wall in the next process, and the smooth transition at the junction of the construction joints. it is good.

3. The height of the prefabricated concrete slabs only needs to meet the height of the construction joints of the basement exterior wall in the code requirements, and is not limited by the modulus of traditional wood formwork.

4. The device is simple in structure, easy to manufacture, and low in cost, and the connecting parts and nuts can be disassembled and reused after the concrete pouring is completed.

Description of drawings

Figure 1 is a schematic diagram of the installation of prefabricated concrete slabs with flanging of basement exterior walls.

Figure 2 is a schematic diagram of the completed concrete pouring of the basement exterior wall flanging.

Figure 3 is a schematic diagram of the prefabricated concrete slab structure.

Fig. 4 is a schematic diagram showing the expansion of the precast concrete U-shaped plate structure.

Figure 5 is a schematic diagram of the connection of precast concrete slabs.

Fig. 6 is a schematic diagram of the connection between the precast concrete slab and the precast concrete U-shaped slab.

Fig. 7 is a schematic diagram of connection of in-line connection steel plates.

Fig. 8 is a schematic diagram of connection of L-shaped connection steel plates.

Figure 9 is a schematic diagram of the completion of the connection of precast concrete thin slabs.

Among them, 1-prefabricated concrete slab, 2-eye bolts, 3-nuts, 4-basement exterior wall reinforcement, 5-supporting piles, 6-waterproof steel plate, 7-waterproof steel plate fixing rib, 8-iron wire, 9 -Prefabricated concrete sheet positioning reinforcement, 10-raft reinforcement, 11-supporting reinforcement, 12-positioning reinforcement, 13-reinforcement mesh, 14-reserved holes, 15-inline connecting steel plate, 16-L-shaped connecting steel plate, 17-Prefabricated concrete U-shaped slab, 18-Raft concrete, 19-Flanged concrete for basement exterior wall.

Detailed ways

The present invention will be described in detail below with reference to FIG. 1 to FIG. 9 .

A dismantling-free basement exterior wall flanging unilateral formwork support device, comprising precast concrete thin slabs, connecting steel plates, iron wires 8, eyebolts 2, and nuts 3. As shown in Figure 6, the precast concrete sheet is divided into a precast concrete slab 1 and a precast concrete U-shaped slab 17. As shown in Figures 3 and 4, the precast concrete slab 1 and the precast concrete U-shaped slab 17 are provided with steel mesh sheets 13, The reinforcement mesh sheet 13 is composed of light round steel bars distributed vertically and horizontally, and the precast concrete slab 1 and U-shaped slab 17 are provided with reserved holes 14; the connecting steel plates are divided into a straight connecting steel plate 15 and an L-shaped connecting steel plate 16, as shown in the figure 5 and 7, the precast concrete slabs 1 are connected by an in-line connecting steel plate 15, and as shown in FIG. Connection, the eye bolt 2 passes through the reserved hole 14 on the precast concrete sheet, and the in-line connecting steel plate 15 and the L-shaped connecting steel plate 16 are fixed to the precast concrete sheet through the nut 3, thereby connecting the precast concrete sheet into one piece; As shown in Fig. 1, one end of the iron wire 8 is fixedly connected with the eyebolt 2, and the other end is connected with the raft reinforcement 10, so as to tension the precast concrete sheet and adjust its verticality.

Figure 1 is a schematic diagram of the installation of prefabricated concrete slabs with flanging of the outer wall of the basement. The steel bar 4 of the outer wall of the basement is welded and fixed by the positioning steel bar 12 and the steel bar 10 of the raft to ensure that the steel bar of the outer wall of the basement is firm, does not shake, and the verticality meets the requirements; the supporting steel bar 11 is equivalent to In the horse stool bar, it supports the raft steel bar 10; the support pile 5 is located on the outermost side of the basement, and mainly acts as a soil retainer; the horizontal position of the water-stop steel plate fixing bar 7 is the same as the top surface of the prefabricated concrete slab 1, and the water-stop steel plate fixing bar 7 one end is welded with the middle part of the waterproof steel plate 6, and the other end is welded with the basement exterior wall steel bar 4.

A method for supporting formwork on one side without dismantling the flanging of the outer wall of the basement. In this embodiment, the horizontal construction joint height of the outer wall of the basement is 500mm high as an example for illustration, including the following steps:

1. As shown in Figure 1, release the precast concrete sheet positioning line on the raft steel bar 10, adjust the binding of a raft steel bar closest to the outside of the precast concrete sheet and place it on the position of the precast concrete sheet positioning line, as the precast concrete sheet positioning Reinforcement bar 9 prevents the displacement of the precast concrete slab;

2. The height of the precast concrete thin slab is 550mm (the height of the horizontal construction joint is 500mm + the thickness of the protective layer of the raft steel bar is 50mm), and the thickness is 30-50mm, which is the same as the thickness of the steel bar protective layer of the outdoor wall of the basement. Plate 17 can be divided into precast concrete slabs 1 according to the length of each section of the basement exterior wall on the construction drawings, and precast concrete U-shaped slabs 17 can be produced according to the size of the frame columns, as shown in Figure 9, place the precast concrete U-shaped slabs 17 Place the precast concrete slab 1 on the raft steel bar 10 and close to the frame column, and then place the precast concrete slab 1 on the raft steel bar 10 and close to the basement external wall steel bar 4. A supporting steel bar 11 is provided directly under the precast concrete thin slab to ensure that the precast concrete The bottom of the thin plate is flat and does not bend down. The precast concrete U-shaped plate 17 and the precast concrete slab 1 are connected by an L-shaped connecting steel plate 16, and the precast concrete slabs 1 are connected by an in-line connecting steel plate 15. The sheep eye bolts 2 pass through the precast The reserved hole 14 on the concrete sheet is used to fix the in-line connecting steel plate 15 and the L-shaped connecting steel plate 16 to the precast concrete sheet through the nut 3, thereby connecting the precast concrete sheet into one piece;

3. After the precast concrete sheet is connected, one end of the iron wire 8 is fixedly connected with the eye bolt 2, and the other end is connected with the raft steel bar 10, and the precast concrete sheet and the raft steel bar 10 are fixed by the iron wire 8, and the precast concrete sheet can be fixed. adjusted vertically;

4. The raft concrete 18 is poured first, and before the initial setting of the raft concrete 18, the basement exterior wall flanging concrete 19 is poured. Fig. 2 is a schematic diagram of the completion of the basement exterior wall flanging concrete pouring.

Claims (3)

1. A construction method for a dismantling-free basement exterior wall flanging and one-side support formwork, the steps of which are: 1) Lay out the positioning line of the precast concrete sheet on the raft reinforcement (10), adjust the binding of a raft reinforcement closest to the outside of the precast concrete sheet and place it on the position of the positioning line of the precast concrete sheet, as the precast concrete sheet positioning reinforcement (9) , to prevent the displacement of precast concrete slabs; 2) Precast concrete thin slabs are divided into precast concrete slabs (1) and precast concrete U-shaped slabs (17). The concrete slab (1) is placed on the raft reinforcement (10) and is close to the basement external wall reinforcement (4), and the support reinforcement (11) is provided directly under the precast concrete thin slab, the precast concrete U-shaped plate (17) and the precast concrete The slabs (1) are connected by L-shaped connecting steel plates (16), and the precast concrete slabs (1) are connected by in-line connecting steel plates (15). Type connecting steel plate (15), L-shaped connecting steel plate (16) and prefabricated concrete sheet are fixed and connected into one piece; 3) After the precast concrete sheet is connected, one end of the iron wire (8) is fixedly connected with the eye bolt (2), and the other end is connected with the raft reinforcement (10), and the precast concrete sheet and the raft reinforcement are connected through the iron wire (8). (10) Fix and adjust the precast concrete sheet vertically; 4) The raft concrete (18) is poured first, and before the initial setting of the raft concrete (18), the flanged concrete (19) for the basement exterior wall is poured. 2. The construction method according to claim 1, characterized in that the height of the prefabricated concrete sheet is equal to the height of the horizontal construction joint + the thickness of the raft reinforcement protective layer. 3. The non-demolition-free basement exterior wall flanging single-side formwork construction method according to claim 1, characterized in that the thickness of the prefabricated concrete sheet is equal to the thickness of the basement exterior wall reinforcement protective layer.

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