A method for ensuring the safety and stability of the formwork for the basement exterior wall of large-scale buildings in coastal tidal flat areas

Abstract

The present invention discloses a method for safely and stably fixing the formwork of the basement exterior wall of a large building in a coastal beach area, which relates to the technical field of formwork safety and stability. In the horizontal direction where the concrete of the basement exterior wall is most likely to bulge and deviate, a capping beam is set on the basement foundation pit support. By means of reserved pull rings, a method combining rigidity and flexibility is adopted to reinforce the formwork of the basement exterior wall and improve the stability of the formwork support inside the basement. The method for safely and stably fixing the formwork of the basement exterior wall of a large building in a coastal beach area adopts reserved pull rings on the capping beam of the retaining piles, installs steel pipes in the pull rings, and uses steel wires and steel pipes plus screw rod supports. The method combining rigidity and flexibility not only ensures the safety and stability of the formwork of the basement exterior wall of a large building in a coastal beach area, but also indirectly increases the stability of the formwork support inside the basement, thus ensuring the construction safety of the basement formwork project.

Description

Technical Field

[0001] The present invention relates to the technical field of formwork safety and stability, and particularly to a method for safely and stably fixing the formwork of the basement exterior wall of large-scale buildings in coastal beach areas. Background Art

[0002] When constructing new high-rise or large-scale buildings, most building engineers will preferentially design a multi-functional basement on the first floor for parking, civil air defense, etc.

[0003] For high-rise or large-scale buildings newly built in coastal beach areas, the reinforcement of the formwork of the basement exterior wall poses great difficulties for most operators. As is well known, the formwork of the basement exterior wall cannot be directly connected to the internal support, because once the formwork of the basement exterior wall bulges during the construction of building concrete, it will directly threaten the stability of the entire internal support frame, and even there is a possibility of causing the collapse of the frame. If the formwork of the basement exterior wall adopts an external reinforcement method, due to the soft soil layer formed in the coastal beach area, an effective reinforcement method cannot be implemented.

[0004] Before the construction of the basement formwork project, a special construction plan will be prepared, aiming to take necessary preventive measures to ensure the stability of the formwork of the basement exterior wall. However, due to the lack of understanding of the type of special soil in the special environment - the soft soil layer in the coastal beach area, the conventional measures cannot meet the requirements of the internal and external reinforcement of the formwork of the basement exterior wall. Even due to insufficient measures, it may cause the formwork of the basement exterior wall to bulge, deviate, tilt, and even threaten the stability of the internal support of the basement roof, resulting in the occurrence of collapse phenomena, directly affecting construction safety.

[0005] By innovating a technology for the safety and stability of the formwork of the basement exterior wall of large-scale buildings in coastal beach areas, making advance plans, on the horizontal direction where the formwork of the basement exterior wall is most likely to bulge and deviate during the concrete pouring of the basement exterior wall, a capping beam is set on the basement foundation pit support. By means of reserved pull rings, a method combining rigidity and flexibility is adopted to reinforce the formwork of the basement exterior wall, and the stability of the internal support frame of the basement formwork is improved, which can prevent the safety of the formwork of the basement exterior wall and even the entire internal support of the basement formwork, thus achieving the safety goal of the basement project of large-scale buildings in the entire coastal beach area. Summary of the Invention

[0006] (1) Technical Problems to be Solved

[0007] Aiming at the deficiencies of the prior art, the present invention provides a method for safely and stably fixing the formwork of the basement exterior wall of large-scale buildings in coastal beach areas, and solves the technical problems mentioned in the background art.

[0008] (2) Technical Solutions

[0009] The present invention aims at the technical solution for the safety and stability of the formwork of the basement exterior wall of large buildings in the existing conventional coastal tidal flat areas, which cannot guarantee the construction requirements for the stability of the formwork of the basement exterior wall in the case of soft soil layers in the special environment - coastal tidal flat areas. To make up for the defects and deficiencies, early planning is carried out. At the horizontal direction where the basement exterior wall concrete is most prone to formwork bulging and deviation, a capping beam is set on the basement foundation pit support. By means of reserved pull rings and a method combining rigidity and flexibility, the formwork of the basement exterior wall is strengthened, and the stability of the internal support frame of the basement formwork is improved, which can prevent the safety of the formwork of the basement exterior wall and even the entire internal support of the basement formwork, thereby achieving the safety goal of the basement project of large buildings in the entire coastal tidal flat area, minimizing the loss of safety costs to the greatest extent, and enhancing the reputation of construction enterprises.

[0010] The present invention includes the following construction contents and steps:

[0011] Step 1: Plan in advance, set the top of the basement foundation pit support piles at 1 / 3 to 1 / 2 of the basement height, set a capping beam on the basement foundation pit support piles, reserve φ20 steel bar pull rings on one side of the formwork of the basement exterior wall corresponding to the capping beam, with a spacing of 1.5 m. Install steel pipes inside the φ20 steel bar pull rings, and the slope of the soil excavation above the capping beam is 1:1 for the basement foundation pit slope;

[0012] Step 2: Set up an internal support frame for the formwork on the basement foundation raft;

[0013] Step 3: Install the inner formwork of the basement exterior wall, drill φ20 water-stop screw holes at a spacing of 1.0 m at the horizontal position corresponding to the capping beam, install φ20 water-stop screws. According to the φ20 water-stop screw holes on the inner formwork of the basement exterior wall, drill φ20 water-stop screw holes on the outer formwork of the basement exterior wall, install the outer formwork of the basement exterior wall, and then install the formwork backing of the basement exterior wall;

[0014] Step 4: At the exposed parts of the φ20 water-stop screws on the inner and outer formworks of the basement exterior wall, use double steel pipes and fix them with mountain-shaped clamps. When fixing, ensure that the inner size of the formwork of the basement exterior wall meets the requirements of the drawing design, and then carry out the conventional reinforcement of the formwork of the basement exterior wall;

[0015] Step 5: Use a tightener to tighten the steel wire rope, and use a combination of steel pipes and screw jacks to rigidly support the double steel pipes on the outer formwork of the basement exterior wall and the steel pipes inside the φ20 steel bar pull rings, and align the formwork of the basement exterior wall vertically in a form combining rigidity and flexibility. The spacing between the steel wire rope and the tightener, and the combination of steel pipes and screw jacks is 1.5 m;

[0016] Step 6: Connect the vertical poles of the internal support frame of the formwork with the double steel pipes on the inner side of the formwork of the basement exterior wall using connecting steel pipes. The spacing of the connecting steel pipes is adjusted according to the vertical poles of the internal support frame of the formwork and controlled at about 2.0 m.

[0017] (3) Beneficial effects

[0018] The present invention provides a method for ensuring the safety and stability of the formwork for the exterior wall of the basement of a large building in coastal beach areas. It has the following beneficial effects:

[0019] The method for ensuring the safety and stability of the formwork for the exterior wall of the basement of a large building in coastal beach areas adopts the method of reserving pull rings on the capping beam of the retaining piles and installing steel pipes in the pull rings, and using steel wire ropes, steel pipes and screw rod supports, combining rigidity and flexibility, which not only ensures the safety and stability of the formwork for the exterior wall of the basement of a large building in coastal beach areas, but also indirectly increases the stability of the internal support of the basement formwork, thus ensuring the safety of the construction of the basement formwork project and avoiding various economic losses caused by safety accidents, so as to achieve the safety goal and economic goal of the whole project. Brief description of the drawings

[0020] Figure 1 It is a front elevation view of the present invention;

[0021] Figure 2 It is a plan view of the present invention.

[0022] In the figure: 1. Basement foundation raft; 2. Formwork for the exterior wall of the basement; 3. Slope of the basement foundation pit; 4. Retaining piles of the basement foundation pit; 5. Capping beam; 6. Formwork backing strip; 7. Steel bar pull ring; 8. Steel pipe; 9. Double steel pipes; 10. Waterstop screw rod; 11. Steel wire rope; 12. Wire rope tightener; 13. U-shaped clamp; 14. Combination of steel pipe and screw rod support; 15. Connecting steel pipe; 16. Internal formwork support frame of the basement. Detailed implementation manners

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] Embodiment 1: A method for ensuring the safety and stability of the formwork for the exterior wall of the basement of a large building in coastal beach areas

[0025] Step 1: Plan in advance, set the top of the retaining piles 4 of the basement foundation pit at 1 / 3 to 1 / 2 of the basement height, set a capping beam 5 on the retaining piles 4 of the basement foundation pit, reserve φ20 steel bar pull rings 7 on one side of the formwork 2 for the exterior wall of the basement corresponding to the capping beam 5, with a spacing of 1.5 m, install steel pipes 8 in the φ20 steel bar pull rings 7, and the slope of the earth excavation above the capping beam 5 is 1:1 for the slope 3 of the basement foundation pit;

[0026] Step 2: Set up an internal formwork support frame 16 on the basement foundation raft 1;

[0027] Step 3: Install the inner basement exterior wall formwork 2. Drill φ20 water-stop screw holes 10 at the horizontal position of the capping beam 5 with a spacing of 1.0 m. Install the φ20 water-stop screws 10. According to the φ20 water-stop screw holes 10 on the inner basement exterior wall formwork 2, drill φ20 water-stop screw holes 10 on the outer basement exterior wall formwork 2, install the outer basement exterior wall formwork 2, and then install the formwork backing 6;

[0028] Step 4: At the exposed parts of the φ20 water-stop screws 10 on the inner and outer basement exterior wall formworks 2, use double steel pipes 9 and fix them with U-shaped clamps 13. When fixing, ensure that the inner dimensions of the basement exterior wall formwork 2 meet the requirements of the drawing design, and then conduct the conventional reinforcement of the basement exterior wall formwork 2;

[0029] Step 5: Use a tightener 12 to tighten the steel wire rope 11, and use a combination of a steel pipe and a screw jack 14 to rigidly support the steel pipe 8 inside the double steel pipes 9 and the φ20 steel bar pull rings 7 on the outer basement exterior wall formwork 2, and align the verticality of the basement exterior wall formwork 2 in a form of combining rigidity with flexibility. The spacing between the steel wire rope 11 and the tightener 12, and the combination of the steel pipe and the screw jack 14 is 1.5 m;

[0030] Step 6: Use a connecting steel pipe 15 to connect the vertical poles of the formwork inner support frame 16 with the double steel pipes 9 on the inner side of the basement exterior wall formwork 2. The spacing of the connecting steel pipes 15 is adjusted according to the vertical poles of the formwork inner support frame 16 and controlled at about 2.0 m.

[0031] It should be noted that in the description of the invention, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. is the description of the structure of the present invention based on the drawings shown, and is only for the convenience of describing the present invention simply, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0032] For the "first" and "second" in this technical solution, they are only used to distinguish the names of the corresponding structures with the same or similar structures or similar functions, rather than arranging the importance of these structures, nor having a sequence, or comparing sizes, or other meanings.

[0033] In addition, unless otherwise clearly specified and defined, the terms "installation" and "connection" should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two structures. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the general idea of the present invention and in connection with the specific circumstances of this solution.

Claims

1. A method for ensuring the safety and stability of the formwork of the basement exterior wall of large-scale buildings in coastal tidal flat areas, characterized in that: It includes the following steps: Step 1: Set the top of the basement foundation pit retaining pile (4) at 1 / 3 - 1 / 2 of the basement height. Set a capping beam (5) on the basement foundation pit retaining pile (4). Reserve a steel bar pull ring (7) on one side of the basement exterior wall formwork (2) corresponding to the capping beam (5). Install a steel pipe (8) inside the steel bar pull ring (7). The excavation slope of the soil above the capping beam (5) is 1:1 for the basement foundation pit slope (3); Step 2: Set up an inner formwork support frame (16) on the basement foundation raft (1); Step 3: Install the inner basement exterior wall formwork (2). Drill holes for the water-stop screw rod (10) at a certain distance of the eye spacing of the water-stop screw rod (10) at the horizontal position of the capping beam (5) and install the water-stop screw rod (10). Drill holes for the water-stop screw rod (10) on the outer basement exterior wall formwork (2) according to the holes of the water-stop screw rod (10) on the inner basement exterior wall formwork (2). Install the outer basement exterior wall formwork (2), and then install the formwork backing (6); Step 4: At the exposed part of the water-stop screw rod (10) of the inner and outer basement exterior wall formwork (2), use double steel pipes (9) and fix them with mountain-shaped clamps (13). When fixing, ensure that the inner dimension of the basement exterior wall formwork (2) meets the requirements of the drawing design, and then carry out the conventional reinforcement of the basement exterior wall formwork (2); Step 5: Use a tightener (12) to tighten the steel wire rope (11), and use a combination of a steel pipe and a screw rod support (14) to rigidly support the double steel pipes (9) on the outer basement exterior wall formwork (2) and the steel pipe (8) inside the steel bar pull ring (7). Correct the verticality of the basement exterior wall formwork (2) in a form of combining rigidity and flexibility, the steel wire rope (11) and the tightener (12); Step 6: Connect the vertical poles of the inner formwork support frame (16) and the double steel pipes (9) inside the basement exterior wall formwork (2) using a connecting steel pipe (15).

2. A method for ensuring the safety and stability of the formwork for the basement exterior wall of large buildings in coastal tidal flat areas, characterized in that: The spacing of the combination of the steel pipe and the screw rod support (14) is 1.5 m.

3. A method for ensuring the safety and stability of the formwork for the basement exterior wall of large buildings in coastal tidal flat areas, characterized in that: The spacing of the connecting steel pipe (15) is adjusted according to the vertical poles of the inner formwork support frame (16) and controlled within 2.0 m.

4. A method for ensuring the safety and stability of the formwork for the basement exterior wall of large buildings in coastal tidal flat areas, characterized in that: The eye spacing of the water-stop screw rod (10) is 1 m to install the water-stop screw rod (10).

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