Formwork-expansion-preventing prefabricated hollow wall

Abstract

The utility model belongs to the technical field of assembly type constructional engineering, and particularly relates to an anti-formwork-expansion prefabricated hollow wall. Comprising an A-side wall plate, a B-side wall plate and a tie piece, the A-side wall plate and the B-side wall plate are arranged in parallel, the tie piece is used for connecting the A-side wall plate and the B-side wall plate, the tie piece comprises an anti-expansion opposite-pull piece and a tie bar, the two ends of the tie bar are connected with an A-side wall stress reinforcing mesh in the A-side wall plate and a B-side wall stress reinforcing mesh in the B-side wall plate respectively, the anti-expansion opposite-pull piece is bound on the tie bar, and the tie bar is connected with the A-side wall stress reinforcing mesh in the A-side wall plate and the B-side wall stress reinforcing mesh in the B-side wall plate. The two ends of the anti-swelling opposite-pulling piece are embedded in the A-face wall plate and the B-face wall plate correspondingly, and the end faces of the two ends of the anti-swelling opposite-pulling piece are flush with the outer surfaces of the A-face wall plate and the B-face wall plate correspondingly. The device is high in forming precision, simple and easy to implement, accurate in alignment and low in manufacturing cost, and the phenomenon of mold expansion is avoided during secondary pouring.

Description

Technical Field

[0001] The utility model belongs to the technical field of prefabricated building engineering, and particularly relates to a precast hollow wall for preventing formwork swelling. Background Art

[0002] The hollow wall is a commonly used precast reinforced concrete member, which is prefabricated in a factory and then secondarily cast on the construction site to form a load-bearing wall. The hollow wall consists of a precast A-side wall panel, a precast B-side wall panel and a cavity, and the A and B wall panels are connected by tie members. At present, the forming of the hollow wall adopts the overturning and reverse inserting forming process: after the wall steel mesh is tied and in place, the B-side wall panel is first poured to the designed thickness, cured and formed, then overturned 180°, and then the A-side wall panel is poured to the designed thickness. Since there are tie members connecting and supporting between the A and B wall panels, the middle cavity is formed, and then the precast double-sided composite shear wall is formed. During construction, the hollow wall is transported to the construction site, and the side needs to be connected with other components by steel bars. Then, concrete is poured into the cavity. After curing and forming, a load-bearing wall is formed. The technical defects of the existing hollow wall structure and construction process are as follows: 1) It is difficult to control the thickness of the steel bar protection layer on the A-side wall panel. That is, when the steel mesh is inserted into the A-side concrete, due to the vibration effect, the protection layer is extremely easy to shift and fall off, resulting in deviation of the protection layer thickness and causing product quality problems. 2) During the overall reverse inserting forming, the insertion depth of the A-side steel mesh is affected by the concrete aggregate, and the insertion depth is often insufficient. Since the steel mesh is horizontally arranged in a continuous cross shape with many intersection points and a large density, the stones in the concrete prevent the entire mesh of steel bars from fully falling into the designed position. Insufficient insertion depth causes problems in the forming accuracy of the component and is also extremely easy to cause formwork swelling during the secondary casting at the construction site. 3) The connecting piece between the A and B wall panels is used to fix the steel mesh during the forming of the hollow wall. During the on-site concrete pouring, it is the only formwork swelling prevention connecting piece. If the mesh cannot be inserted into the concrete deep enough, the pulling-off formwork swelling phenomenon will inevitably occur. Therefore, the existing hollow wall structure has poor forming accuracy and is prone to formwork swelling during the secondary casting. Summary of the Utility Model

[0003] Aiming at the above problems, the purpose of the utility model is to provide a precast hollow wall for preventing formwork swelling to solve the problems of poor forming accuracy of the existing hollow wall structure and easy formwork swelling during the secondary casting.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The utility model provides a prefabricated hollow wall with an anti-expansion mold, comprising an A-side wall panel and a B-side wall panel arranged in parallel and an anti-expansion mold anchoring piece for connecting the A-side wall panel and the B-side wall panel, wherein the anti-expansion mold anchoring piece comprises an anti-expansion tie piece and an anchoring bar, wherein the two ends of the anchoring bar are respectively connected to the A-side wall stress-bearing steel mesh in the A-side wall panel and the B-side wall stress-bearing steel mesh in the B-side wall panel, the anti-expansion tie piece is tied to the anchoring bar, and the two ends are respectively embedded in the A-side wall panel and the B-side wall panel, and the end faces of the two ends of the anti-expansion tie piece are respectively flush with the outer surfaces of the A-side wall panel and the B-side wall panel.

[0006] The anti-expansion tension member includes a rod body, an A-side wall anchoring section and a B-side wall anchoring section, wherein the rod body is tied and fixed to the tie bar, the A-side wall anchoring section and the B-side wall anchoring section are respectively connected to the two ends of the rod body, the A-side wall anchoring section is pre-embedded in the A-side wall panel, and the B-side wall anchoring section is pre-embedded in the B-side wall panel.

[0007] The A-side wall anchoring section and the B-side wall anchoring section are both straight rods, and are vertically connected to the rod body to form an "I"-shaped structure.

[0008] Both ends of the A-side wall anchoring section and the B-side wall anchoring section are sleeved with anchor end sleeves.

[0009] The length of the anti-expansion tension member is equal to the thickness of the prefabricated hollow wall of the anti-expansion mold.

[0010] The two ends of the tie bar are hook-shaped, and the two ends of the tie bar are respectively hooked on the A-side wall stress steel mesh and the B-side wall stress steel mesh and then tied and fixed; the A-side wall stress steel mesh and the B-side wall stress steel mesh are connected by multiple tie bars to form a steel cage.

[0011] The B-side wall panel is provided with a B-side steel bar protective layer pad located outside the B-side wall stress-bearing steel bar mesh, and the bottom surface of the B-side steel bar protective layer pad is flush with the outer surface of the B-side wall panel.

[0012] The anti-expansion tension members and tie bars are both made of steel bars.

[0013] The advantages and beneficial effects of the utility model are as follows: the utility model provides an anti-expansion mold prefabricated hollow wall, which has high molding accuracy, is simple and easy to operate, accurately positions, and has low cost, and can avoid the expansion of the mold during secondary pouring. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural schematic diagram of a prefabricated hollow wall with an anti-expansion mold according to the utility model;

[0015] Figure 2 It is a structural schematic diagram of the anti-expansion tension member in the utility model.

[0016] In the figure: 1 is the anti-bulging tension member, 101 is the rod body, 102 is the anchoring section of the A-side wall, 103 is the anchoring section of the B-side wall, 2 is the A-side wall panel, 3 is the B-side wall panel, 4 is the steel bar mesh for the A-side wall under stress, 5 is the steel bar mesh for the B-side wall under stress, 6 is the tie bar, and 7 is the concrete cover block for the B-side steel bars. Specific implementation manner

[0017] In order to make the objectives, technical solutions, and advantages of the present utility model clearer, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] See Figure 1 As shown, the present utility model provides a precast hollow wall with anti-bulging formwork, which includes an A-side wall panel 2 and a B-side wall panel 3 arranged in parallel, and an anti-bulging formwork tie member for connecting the A-side wall panel 2 and the B-side wall panel 3. The anti-bulging formwork tie member includes an anti-bulging tension member 1 and a tie bar 6. The two ends of the tie bar 6 are respectively connected to the steel bar mesh 4 for the A-side wall in the A-side wall panel 2 and the steel bar mesh 5 for the B-side wall in the B-side wall panel 3. The anti-bulging tension member 1 is tied to the tie bar 6, and the two ends are respectively embedded in the A-side wall panel 2 and the B-side wall panel 3. The end faces of the two ends of the anti-bulging tension member 1 are flush with the outer surfaces of the A-side wall panel 2 and the B-side wall panel 3.

[0019] In the embodiment of the present utility model, the two ends of the tie bar 6 are hook-shaped. After the two ends of the tie bar 6 respectively hook the steel bar mesh 4 for the A-side wall and the steel bar mesh 5 for the B-side wall, they are tied and fixed. After the steel bar mesh 4 for the A-side wall and the steel bar mesh 5 for the B-side wall are connected by a plurality of tie bars 6, a steel bar cage is formed, and the steel bar mesh 4 for the A-side wall and the steel bar mesh 5 for the B-side wall are respectively cast in the A-side wall panel 2 and the B-side wall panel 3.

[0020] Furthermore, in the B-side wall panel 3, there is a concrete cover block 7 for the B-side steel bars located outside the steel bar mesh 5 for the B-side wall under stress. The bottom surface of the concrete cover block 7 for the B-side steel bars is flush with the outer surface of the B-side wall panel 3.

[0021] See Figure 1 、 Figure 2 As shown, in the embodiment of the present utility model, the anti-bulging tension member 1 includes a rod body 101, an anchoring section 102 of the A-side wall, and an anchoring section 103 of the B-side wall. The anchoring section 102 of the A-side wall and the anchoring section 103 of the B-side wall are respectively connected to the two ends of the rod body 101. The rod body 101 is tied and fixed to the tie bar 6. The anchoring section 102 of the A-side wall is embedded in the A-side wall panel 2, and the anchoring section 103 of the B-side wall is embedded in the B-side wall panel 3.

[0022] Preferably, both the A-side wall anchoring section 102 and the B-side wall anchoring section 103 are straight rods, and are perpendicularly connected to the rod body 101 to form a "work" shaped structure. The length of the anti-expansion tension member 1 is equal to the thickness H of the anti-expansion formwork precast hollow wall. Specifically, the specifications of the anti-expansion tension member 1 are determined by mechanical calculations according to the wall thickness, height, etc., and it is generally appropriate to have a diameter of about 10 mm.

[0023] Furthermore, both ends of the A-side wall anchoring section 102 and the B-side wall anchoring section 103 are sleeved with tension member end sheaths. Preferably, the tension member end sheaths are made of materials such as plastic to prevent rust spots from forming on the steel bar ends on the wall surface. The wall thickness of the tension member end sheaths is determined by the design, its diameter matches the steel bar diameter, and the insertion depth of the tension member end sheaths is determined by the design; the steel bar protection layer of the AB-side wall panels is calculated starting from the outer skin of the sheath. The rod body 101 controls the anti-pulling force of the casting formwork expansion according to the steel bar grade and diameter, and its height is determined by the designed thickness of the wall. During prefabrication and forming, the A-side wall anchoring section 102 penetrates into the concrete of the A-side wall panel 2, and the B-side wall anchoring section 103 penetrates into the concrete of the B-side wall panel 3 to increase the overall anchoring force, and its anchoring length is determined by the mechanical calculation of the anti-expansion formwork.

[0024] The specific implementation process of an anti-expansion formwork precast hollow wall provided by the present utility model is as follows:

[0025] Design: Conventional process, including determining the hollow wall panel thickness, anti-expansion formwork tension member layout, wall reinforcement, embedded parts, etc.; see Figure 1 As shown, the designed thickness D1 of the A-side wall panel, the thickness D of the cast-in-place cavity of the hollow wall, the designed thickness D2 of the B-side wall panel, the designed thickness H1 of the steel bar protection layer of the A-side wall panel, the designed thickness H2 of the steel bar protection layer of the B-side wall panel, and the total thickness H of the precast hollow wall.

[0026] Preparation of the anti-expansion tension member 1: Cut and weld it according to the designed specifications and dimensions.

[0027] Prepare the hollow wall steel reinforcement cage, that is, combine the steel bar meshes of the A and B side wall panels. After the A-side wall stress steel bar mesh 4 and the B-side wall stress steel bar mesh 5 are connected by a plurality of tie bars 6, a steel reinforcement cage is formed.

[0028] Prepare the B-side wall panel: Support the side formwork on the formwork table and place the steel reinforcement cage; place B-side steel bar protection layer pads 7 under the steel reinforcement cage to control the position of the B-side wall stress steel bar mesh 5; tie the anti-expansion tension member 1 and the tie bar 6 at the specified position, and the bottom surface of the anti-expansion tension member 1 abuts against the formwork table tightly; install embedded parts (such as wire pipes, wire boxes, etc.), pour concrete, and then perform rough surface treatment, generally by manual roughening; cure and form.

[0029] Manufacturing the A-side wall panel: Support the side form on the mold table, install embedded parts (such as wire pipes, junction boxes, etc.), pour concrete into the side form, flip the prefabricated B-side wall panel together with the steel reinforcement cage and the anti-expansion tie 1 by 180°, and integrally insert it upside down into the side form; after the B-side wall panel is formed, the anti-expansion tie 1 has been cast together with the B-side wall concrete, so when flipping and inserting it into the A-side wall panel concrete, it is directly inserted into the bottom layer for positioning, playing the role of replacing the protective layer cushion block; rough surface treatment, generally manual roughening; after curing and forming, demold together, and the product is completed to obtain an anti-expansion mold precast hollow wall, and the total thickness H of the precast hollow wall = D1 + D + D2.

[0030] In the embodiment of the present utility model, the anti-expansion tie 1 plays a positioning role during the forming of the hollow wall, improving the overall forming accuracy, and fully ensuring the thickness of the steel bar protective layer of the A and B side wall panels; the two ends of the anti-expansion tie 1 are inserted into the concrete of the precast wall panel to the maximum extent, greatly enhancing the anchoring force and significantly enhancing the anti-expansion mold ability of the hollow wall. The anti-expansion mold tie is arranged in a point pattern, without special equipment, with low cost, reducing the production cost.

[0031] The above is only the implementation mode of the present utility model, and is not used to limit the protection scope of the present utility model. Any modification, equivalent replacement, improvement, expansion, etc. made within the spirit and principle of the present utility model are included in the protection scope of the present utility model.

Claims

1. An anti-expansion mold prefabricated hollow wall, comprising an A-side wall panel (2), a B-side wall panel (3) arranged in parallel, and an anti-expansion mold tie piece for connecting the A-side wall panel (2) and the B-side wall panel (3), characterized in that: The anti-expansion mold anchor comprises an anti-expansion tie member (1) and an anchor bar (6), wherein the two ends of the anchor bar (6) are respectively connected to the A-side wall stress steel mesh (4) in the A-side wall panel (2) and the B-side wall stress steel mesh (5) in the B-side wall panel (3); the anti-expansion tie member (1) is tied to the anchor bar (6), and the two ends are respectively embedded in the A-side wall panel (2) and the B-side wall panel (3); the end faces of the two ends of the anti-expansion tie member (1) are respectively flush with the outer surfaces of the A-side wall panel (2) and the B-side wall panel (3).

2. The anti-expansion formwork prefabricated hollow wall according to claim 1, characterized in that: The anti-expansion tension member (1) comprises a rod body (101), an A-side wall anchoring section (102) and a B-side wall anchoring section (103), wherein the rod body (101) is tied and fixed to the tie bar (6), the A-side wall anchoring section (102) and the B-side wall anchoring section (103) are respectively connected to the two ends of the rod body (101), the A-side wall anchoring section (102) is pre-buried in the A-side wall panel (2), and the B-side wall anchoring section (103) is pre-buried in the B-side wall panel (3).

3. The anti-expansion formwork prefabricated hollow wall according to claim 2, characterized in that: The A-side wall anchoring section (102) and the B-side wall anchoring section (103) are both straight rods, and are vertically connected to the rod body (101) to form an "I"-shaped structure.

4. The anti-expansion formwork prefabricated hollow wall according to claim 3, characterized in that: Both ends of the A-side wall anchoring section (102) and the B-side wall anchoring section (103) are sleeved with anchor end sleeves.

5. The anti-expansion formwork prefabricated hollow wall according to claim 2, characterized in that: The length of the anti-expansion tension member (1) is equal to the thickness of the prefabricated hollow wall of the anti-expansion mold.

6. The expansion-proof prefabricated hollow wall according to claim 1, characterized in that: The two ends of the tie bars (6) are hook-shaped, and the two ends of the tie bars (6) are respectively hooked onto the A-side wall stress steel mesh (4) and the B-side wall stress steel mesh (5) and then tied and fixed; the A-side wall stress steel mesh (4) and the B-side wall stress steel mesh (5) are connected by a plurality of tie bars (6) to form a steel cage.

7. The expansion-proof prefabricated hollow wall according to claim 1, characterized in that: The B-side wall panel (3) is provided with a B-side steel bar protective layer pad (7) located outside the B-side wall stress-bearing steel bar mesh (5), and the bottom surface of the B-side steel bar protective layer pad (7) is flush with the outer surface of the B-side wall panel (3).

8. The expansion-proof prefabricated hollow wall according to claim 1, characterized in that: The anti-expansion tension member (1) and the tie bar (6) are both made of steel bars.

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