Air bag cover for foundation pit excavation

Abstract

The invention belongs to the field of buildings, and discloses an air bag cover for foundation pit excavation, which comprises a safety net bag and an inflatable air bag, the safety net bag is mounted above a foundation pit, the periphery of the safety net bag is fixed around the foundation pit, one side of the foundation pit can be provided with a door frame for an earthwork vehicle to enter and exit, the safety net bag is fixed on the door frame, and the inflatable air bag is filled with helium. The inflatable air bags are located below the safety net bag, and the portion, below the safety net bag, of the inflatable air bags is filled with an air bag layer. The safety net bag is arranged to limit the inflatable air bag with the lifting force, the foundation pit cover with the dust falling and noise reduction effects can be rapidly built through the lifting force of the inflatable air bag and the safety net bag, compared with an existing foundation pit air film, prefabrication is not needed, the foundation pit cover can be rapidly built on site, and the situation that the foundation pit cover loses efficacy after the air bag is damaged does not need to be worried about.

Description

Technical Field

[0001] The invention belongs to the field of construction, and in particular relates to an air bag cover used for foundation pit excavation. Background Art

[0002] Most urban buildings require excavation of foundation pits for foundation construction. During the excavation process, earthmoving vehicles are required to pull away the excavated earth. However, during the excavation of the foundation pit, not only will a large amount of dust be generated, but also the construction machinery will generate a large amount of noise. In order to solve this problem, the prior art proposes the construction technology of "foundation pit air film". The foundation pit air film is to cover the foundation pit with a film, and then inflate the film, using the pressure difference between the inside and outside to support the film material, thereby forming a closed working space similar to a dome. Although this foundation pit air film can seal the foundation pit, there are the following problems: the earthmoving vehicle needs to continuously pull away the excavated earth, and the positive pressure state in the air film is not easy to maintain, requiring the blower to work continuously, and the blower will generate a large noise; secondly, each foundation pit needs to be customized with an air film that matches its size, and the air film can hardly be recycled, which makes the production cost high; and the foundation pit air film can only be used for foundation pits with smaller areas, and cannot be used normally for foundation pits with larger areas; if the air film is damaged, the airbag cover will fail instantly. In order to solve the above problems, a foundation pit protection solution is needed that is easy to use, easy to deploy and reusable. Summary of the invention

[0003] The purpose of the present invention is to solve the problems in the background technology and provide an airbag cover for foundation pit excavation. The airbag cover can adapt to foundation pits of various areas and is easy to deploy. During use, it can maintain its dome state without the need for equipment such as a blower.

[0004] The objective of the present invention is achieved through the following technical solutions:

[0005] An airbag cover for foundation pit excavation comprises a safety net bag and an inflatable airbag, wherein the safety net bag is installed above the foundation pit and is fixed around the foundation pit; a door frame for earthmoving vehicles to enter and exit can be processed on one side of the foundation pit, and the safety net bag is fixed on the door frame; the inflatable airbag is filled with helium and is located below the safety net bag; and a plurality of inflatable airbags are filled with an airbag layer below the safety net bag.

[0006] The inflatable airbag is in the shape of an elongated strip, and the cross section of the inflatable airbag is circular, prismatic, pentagonal or hexagonal. The length of the inflatable airbag is greater than twice the diameter.

[0007] An inflation port is arranged at the bottom of the inflatable airbag, and a counterweight block is arranged at the inflation port to keep the inflatable airbag in a vertical state.

[0008] The interior of the inflatable airbag has a multi-chamber regular prism structure. A plurality of vertical diaphragms are provided on the central axis of the inflatable airbag to divide the inflatable airbag into a plurality of chambers. A counterweight is provided at the bottom of the inflatable airbag to maintain the direction of the inflatable airbag.

[0009] The beneficial effects of the airbag cover for foundation pit excavation provided by the present invention are as follows:

[0010] (1) By setting up a safety net to limit the inflatable airbag with lift force, a foundation pit cover with dust reduction and noise reduction effects can be quickly built by using the lift force of the inflatable airbag and the safety net. Compared with the existing foundation pit air film, it does not need to be prefabricated, can be quickly built on site, and there is no need to worry about the failure of the foundation pit cover after the airbag is damaged;

[0011] (2) By setting up long strip-shaped airbags, the gap path between the airbags can be increased, which can improve the blocking effect on dust, and at the same time increase the transmission path of noise to improve the absorption effect on noise. Description of the Drawings

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0013] Figure 1 Structural schematic provided for the embodiment of the present invention Figure 1 。

[0014] Figure 2 Structural schematic provided for the embodiment of the present invention Figure 2 。

[0015] Figure 3 Filling structure schematic of the inflatable airbag provided for the embodiment of the present invention Figure 1 。

[0016] Figure 4 Filling structure schematic of the inflatable airbag provided for the embodiment of the present invention Figure 2 。

[0017] Figure 5 Internal structure schematic diagram of the inflatable airbag provided for the embodiment of the present invention.

[0018] Markings in the figure: 1, safety net; 2, inflatable airbag; 3, gantry; 4, foundation pit. Detailed Embodiments

[0019] As Figures 1 to 5As shown in the figure, the airbag cover provided in this embodiment for the excavation of the foundation pit 4 includes a safety net bag 1 and an inflatable airbag 2. The safety net bag 1 is installed above the foundation pit 4, and the four sides of the safety net bag 1 are fixed around the foundation pit 4. A gantry 3 for the earthwork truck to enter and exit can be processed on one side of the foundation pit 4. The gantry 3 can prevent the earthwork truck from rubbing against the safety net bag 1, which can improve the safety of the airbag cover. The safety net bag 1 is fixed on the gantry 3. The inflatable airbag 2 is filled with helium, and the inflatable airbag 2 is located below the safety net bag 1. Multiple inflatable airbags 2 fill out an airbag layer below the safety net bag 1. The airbag layer can be used as an isolation layer to isolate the foundation pit 4 from the outside world, improving the dust suppression and noise reduction effects on the foundation pit 4.

[0020] For the sake of laying efficiency, the inflatable airbag 2 is in a long strip shape. The cross-section of the inflatable airbag 2 is circular, rhombic, pentagonal or hexagonal. The length dimension of the inflatable airbag 2 is greater than twice the diameter dimension, and the diameter of the inflatable airbag 2 is 30 - 50 cm.

[0021] To improve the filling density of the airbag layer, an inflation port is provided at the bottom of the inflatable airbag 2, and a counterweight is provided at the inflation port to keep the inflatable airbag 2 in a vertical state. The vertical inflatable airbags 2 can be closely arranged, which can improve the consistency of the inflatable airbags 2 and increase the thickness of the airbag layer. While the thickness increases, the gap density between adjacent inflatable airbags 2 will decrease, as Figure 3 、 Figure 4 shown, thereby ensuring the dust suppression and noise reduction effects.

[0022] In addition, by using multiple inflatable airbags 2, after one of the airbags is broken, the remaining airbags will also move closer to each other, and the staff only needs to supplement new inflatable airbags 2 from the four sides to ensure the density of the airbag layer.

[0023] To improve the structural strength of the inflatable airbag 2, the interior of the inflatable airbag 2 is in a multi-chamber regular prism structure, as Figure 5 shown. A plurality of vertical diaphragms are provided on the central axis of the inflatable airbag 2 to divide the inflatable airbag 2 into multiple chambers. A counterweight is provided at the bottom of the inflatable airbag 2 to maintain the direction of the inflatable airbag 2. The multiple chambers can increase the service life of the inflatable airbag 2, and this kind of airbag can also be made of transparent material to improve the light transmission effect of the airbag cover.

[0024] The usage method of the present invention is:

[0025] During use, safety net bags 1 are laid around the foundation pit 4, and gantries 3 are built at the entrances where dump trucks and engineering vehicles need to enter and exit. Then, safety net bags 1 are installed on the gantries 3 and the outer foundation pit 4. The safety net bags 1 are fixed to the outside of the foundation pit 4 through anchor nails. Then, helium is filled into the inflatable airbag 2, and the inflatable airbag 2 can float. Finally, the inflated inflatable airbag 2 is placed under the safety net bag 1, and the safety net bag 1 is lifted by the inflatable airbag 2 to construct an airbag cover that wraps the foundation pit 4, so as to reduce the dust and noise during the construction of the foundation pit 4. If the inflatable airbag 2 is broken, a new inflatable airbag 2 can be replenished, which is convenient for maintenance and can be recycled.

[0026] The above are only the preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any modification and replacement based on the technical solutions and inventive concepts provided by the present invention should be covered within the protection scope of the present invention.

Claims

1. An airbag cover for foundation pit excavation, characterized in that: The invention comprises a safety net bag (1) and an inflatable airbag (2), wherein the safety net bag (1) is installed above a foundation pit (4), the safety net bag (1) is fixed around the foundation pit (4), a door frame (3) for earthmoving vehicles to enter and exit can be processed on one side of the foundation pit (4), the safety net bag (1) is fixed on the door frame (3), the inflatable airbag (2) is filled with helium, and the inflatable airbag (2) is located below the safety net bag (1), and a plurality of inflatable airbags (2) are filled with an airbag layer below the safety net bag (1).

2. The airbag cover for foundation pit excavation according to claim 1, characterized in that: The inflatable airbag (2) is in the shape of an elongated strip, and the cross section of the inflatable airbag (2) is circular, prismatic, pentagonal or hexagonal. The length of the inflatable airbag (2) is greater than twice the diameter.

3. The airbag cover for foundation pit excavation according to claim 1 or 2, characterized in that: The bottom of the inflatable airbag (2) is provided with an inflating port, and a counterweight is provided at the inflating port to keep the inflatable airbag (2) in a vertical state.

4. The airbag cover for foundation pit excavation according to claim 3, characterized in that: The interior of the inflatable airbag (2) is a multi-cavity regular prism structure, a plurality of vertical diaphragms are provided on the central axis of the inflatable airbag (2) to divide the inflatable airbag (2) into a plurality of cavities, and a counterweight is provided at the bottom of the inflatable airbag (2) to maintain the direction of the inflatable airbag (2).

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