A retaining wall device for a site with easily caving holes

Abstract

The present invention relates to a retaining wall device for a site with easily caving holes, which comprises an airbag, an inner support sheet and an outer support sheet. The airbag is an unclosed annular airbag with a notch. The inner support sheet and the outer support sheet are respectively pasted on the inner side and the outer side of the airbag. A plurality of the inner support sheets are evenly distributed at intervals along the circumferential direction of the airbag, and a plurality of the outer support sheets corresponding thereto are evenly distributed at intervals along the circumferential direction of the airbag. The notch of the airbag corresponds to the interval positions between the inner support sheets and between the outer support sheets. Elastic thin steel sheets I are arranged at the positions corresponding to the interval positions between the inner support sheets and between the outer support sheets on both the inner and outer sides of the airbag, and elastic thin steel sheets II are wrapped at both ends of the airbag. A plurality of limit card slots are arranged on the upper and lower sides of the inner support sheet, the airbag and the outer support sheet. The present invention saves time and effort and can improve the working efficiency of hole forming.

Description

Technical Field

[0001] The present invention belongs to the technical field of engineering geological exploration and bored pile hole forming construction, and particularly relates to a retaining wall device for easily caving sites. Background Art

[0002] During the process of engineering geological exploration or bored pile hole forming construction, the type of site soil has a great influence on the drilling of exploration rigs and the progress and quality of bored pile hole forming construction. For example, during the drilling construction process in fine-grained soils such as some clay, silt, silty sand, and fine sand, due to the self-viscosity of the soil or measures such as mud retaining wall, the rig can drill well without caving. However, when drilling in coarse-grained soils such as gravel, block stone, and coarse-grained slag, since its soil property does not have cohesion and has large pores, the effect of mud retaining wall is very small, and it is difficult and time-consuming to install and disassemble the traditional steel pipe retaining wall; sometimes when the drill is lifted, the hole caves immediately, and the traditional steel pipe retaining wall is also helpless. Summary of the Invention

[0003] Aiming at the deficiencies of the existing technology, the present invention provides a retaining wall device for easily caving sites, which saves time and effort and can improve the working efficiency of hole forming.

[0004] A retaining wall device for easily caving sites includes an airbag, inner support pieces, and outer support pieces. The airbag is an unclosed annular airbag with a notch. The inner support pieces and outer support pieces are respectively pasted on the inner and outer sides of the airbag. The inner support pieces are evenly distributed at intervals along the circumferential direction of the airbag, and the outer support pieces are evenly distributed at intervals along the circumferential direction of the airbag correspondingly; the notch of the airbag corresponds to the interval positions between the inner support pieces and between the outer support pieces; elastic thin steel sheets I are arranged at the positions corresponding to the interval positions between the inner support pieces and between the outer support pieces on both the inner and outer sides of the airbag.

[0005] Both the inner support pieces and the outer support pieces are arc-shaped steel support pieces.

[0006] The outer arc surface side of the inner support piece is pasted on the inner side of the airbag, and the inner arc surface side of the outer support piece is pasted on the outer side of the airbag.

[0007] The inner diameter of the outer support piece is greater than the outer diameter of the inner support piece.

[0008] The difference between the inner diameter of the outer support piece and the outer diameter of the inner support piece is 1 cm.

[0009] Both the inner support pieces and the outer support pieces are evenly distributed three along the radial direction of the airbag.

[0010] The elastic thin steel sheets I are pasted on the airbag, and the two ends extend between the inner and outer support pieces and the airbag to ensure that the inner and outer sides of the airbag are not exposed.

[0011] At both ends of the notch of the airbag, there are elastic thin steel sheets II. The elastic thin steel sheets II wrap around the two ends of the airbag, are pasted on the airbag, and extend into the spaces between the outer support sheet and the airbag and between the inner support sheet and the airbag respectively, ensuring that the ends of the airbag are not exposed.

[0012] On the upper and lower sides of the inner support sheet, the airbag and the outer support sheet, there are several limiting card slots.

[0013] The limiting card slots are arc-shaped and have a U-shaped cross-section. They are buckled on the upper and lower sides of the inner support sheet, the airbag and the outer support sheet, and are welded and fixed to the outside of the outer support sheet.

[0014] The beneficial effects of the present invention are as follows: The present invention provides a retaining wall device for easily caving hole sites. Before work, it can be folded to a certain extent relying on the elastic thin steel sheets, making the diameter appropriately smaller, so that it can be easily placed into the drill hole, compensating for the shortcomings of the traditional steel pipe retaining wall being installed by hammering; after use, the gas in the airbag can be released first to reduce the airbag pressure, and it can be folded to a certain extent relying on the elastic thin steel sheets, and the retaining wall device can be easily taken out. While solving the problem of difficult extraction of the traditional steel pipe retaining wall, since the airbag is non-closed, it can achieve hole wall support without lifting the drill, and support the hole wall while drilling to prevent the occurrence of cave-ins when lifting the drill. The present invention saves time and effort and can improve the working efficiency of hole forming. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the front view of the retaining wall device for easily caving hole sites provided by the embodiment of the present invention;

[0016] Figure 2 is Figure 1 the bottom view of;

[0017] Figure 3 It is the schematic diagram of the inner support ring and the outer support ring in the retaining wall device for easily caving hole sites provided by the embodiment of the present invention;

[0018] Figure 4 It is the schematic diagram of the airbag in the present invention;

[0019] Figure 5 It is the schematic diagram of the limiting card slot in the present invention;

[0020] Wherein,

[0021] 1 - airbag, 2 - inner support sheet, 3 - outer support sheet, 4 - limiting card slot, 5 - elastic thin steel sheet I, 6 - elastic thin steel sheet II, 7 - inflation hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] In order to better explain the present invention for easy understanding, below in conjunction with the drawings, through specific embodiments, the technical solutions and effects of the present invention are described in detail.

[0023] As Figure 1-2 shown, a retaining wall device for a site with easily collapsible boreholes includes an airbag 1, an inner support sheet 2, and an outer support sheet 3. As Figure 4 shown, the airbag 1 is an unclosed annular airbag with a notch. Both the inner support sheet 2 and the outer support sheet 3 are arc-shaped steel support sheets. The inner support sheet 2 and the outer support sheet 3 are respectively pasted on the inner and outer sides of the airbag 1. The outer arc surface side of the inner support sheet 2 is pasted on the inner side of the airbag 1, and the inner arc surface side of the outer support sheet 3 is pasted on the outer side of the airbag 1. The inner diameter of the outer support sheet 3 is larger than the outer diameter of the inner support sheet 2. In this embodiment, the difference between the inner diameter of the outer support sheet 3 and the outer diameter of the inner support sheet 2 is 1 cm. A plurality of the inner support sheets 2 are evenly distributed at intervals along the circumferential direction of the airbag 1, and a plurality of the outer support sheets 3 are evenly distributed at intervals along the circumferential direction of the airbag 1 correspondingly. In this embodiment, both the inner support sheet 2 and the outer support sheet 3 are evenly distributed three along the circumferential direction of the airbag 1, as Figure 3 shown. The notch of the airbag 1 corresponds to the interval positions between the inner support sheet 2 and the outer support sheet 3. Elastic thin steel sheets I 5 are arranged at the interval positions between the inner support sheet 2 and the outer support sheet 3 on both the inner and outer sides of the airbag 1. The elastic thin steel sheets I 5 are pasted on the airbag 1 to make up for the intervals between the inner support sheet 2 and the outer support sheet 3, cover the airbag 1 exposed outside, and protect the airbag 1 from being damaged by sharp stones on the borehole wall. At the same time, due to the elasticity of the elastic thin steel sheets I 5, the inner support sheet 2 and the outer support sheet 3 can be folded to a certain extent.

[0024] Both ends of the elastic thin steel sheet I 5 extend between the inner and outer support sheets 3 and the airbag 1 to ensure that the inner and outer sides of the airbag 1 are not exposed to avoid being damaged.

[0025] Elastic thin steel sheets II 6 are arranged at both ends of the notch of the airbag 1. The elastic thin steel sheets II 6 wrap the two ends of the airbag 1 to cover the exposed ends of the airbag 1 outside and protect the airbag 1 from being damaged by sharp stones on the borehole wall. The elastic thin steel sheets II 6 are pasted on the airbag 1, and both ends of the elastic thin steel sheets II 6 respectively extend into the space between the outer support sheet 3 and the airbag 1 and the space between the inner support sheet 2 and the airbag 1 to ensure that the ends of the airbag 1 are not exposed to avoid being damaged.

[0026] An inflation hole 7 is arranged on the airbag 1, and the airbag 1 is inflated through an external air pump. In this embodiment, the inflation hole 7 is opposite to the notch of the airbag 1, which can make the gas distribution and air pressure distribution in the airbag 1 on both sides of the inflation hole 7 uniform when inflating.

[0027] A number of limiting card slots 4 are arranged on the upper and lower sides of the inner support sheet 2, the airbag 1, and the outer support sheet 3, as Figure 5As shown, the limit slot 4 is arc-shaped and has a U-shaped cross-section. It is buckled on the upper and lower sides of the inner support piece 2, the airbag 1 and the outer support piece 3, and is fixedly welded to the outside of the outer support piece 3, that is, the long arc side of the limit slot 4 is welded to the outside of the outer support piece 3. The limit slot 4 restricts the inner support piece 2 within the limit slot 4, preventing the inner support piece 2 from axially displacing relative to the outer support piece 3. At the same time, the limit slot 4 can limit the excessive radial displacement of the inner support piece 2 caused by the increase in the inflation pressure of the airbag 1, thus affecting the drilling operation. The limit slot 4 is located at the corresponding positions on the upper and lower sides of the inner support piece 2, the airbag 1 and the outer support piece 3.

[0028] The working principle of the above-mentioned shaft protection device for easily caving sites is as follows:

[0029] When the airbag 1 is not inflated, the inner support piece 2 and the outer support piece 3 rely on the elastic thin steel sheet I 5 to fold to a certain extent, adjusting the radial size, and easily placing it into the drilling hole under operation. Subsequently, the airbag 1 is inflated through the inflation hole 7. During the process of the increasing air pressure in the airbag 1, the inner support piece 2 and the outer support piece 3 gradually open. The outer support piece 3 closely adheres to the inner wall of the drilling hole, playing a role in protecting the drilling hole wall. Since the airbag 1 is a non-closed ring, during the drilling operation, support is carried out without lifting the drill, achieving support while drilling and preventing the occurrence of cave-ins when lifting the drill.

Claims

1. A retaining wall device for a site with easily caving holes, characterized in that: It includes an airbag, an inner support piece and an outer support piece. The airbag is an unclosed annular airbag with a notch. An inflation hole is provided on the airbag, and the inflation hole is opposite to the notch of the airbag; the inner support piece and the outer support piece are respectively pasted on the inner side and the outer side of the airbag. A plurality of the inner support pieces are evenly distributed at intervals along the circumference of the airbag, and a plurality of the outer support pieces are evenly distributed at intervals along the circumference of the airbag correspondingly; the intervals between the notch of the airbag and the inner support piece and between the outer support pieces correspond to each other; elastic thin steel sheets I are provided at the intervals between the inner support pieces and between the outer support pieces on both the inner and outer sides of the airbag. Both the inner support piece and the outer support piece are arc-shaped steel support pieces. The elastic thin steel sheet I is pasted on the airbag, and both ends extend between the inner and outer support pieces and the airbag to ensure that the inner and outer sides of the airbag are not exposed. Elastic thin steel sheets II are provided at both ends of the notch of the airbag. The elastic thin steel sheets II wrap the two ends of the airbag, are pasted on the airbag, and both ends respectively extend between the outer support piece and the airbag and between the inner support piece and the airbag to ensure that the ends of the airbag are not exposed. A number of limit card slots are provided on the upper and lower sides of the inner support piece, the airbag and the outer support piece.

2. The retaining wall device for easily caving sites according to claim 1, characterized in that: The outer arc surface side of the inner support piece is pasted on the inner side of the airbag, and the inner arc surface side of the outer support piece is pasted on the outer side of the airbag.

3. The retaining wall device for a hole-prone collapse site according to claim 2, wherein: The inner diameter of the outer support piece is larger than the outer diameter of the inner support piece.

4. A retaining wall device for easily caving hole sites according to claim 3, characterized in that: The difference between the inner diameter of the outer support piece and the outer diameter of the inner support piece is 1 cm.

5. The retaining wall device for easily caving borehole sites according to claim 1, characterized in that: Both the inner support piece and the outer support piece are evenly distributed three along the radial direction of the airbag.

6. The retaining wall device for easily caving hole sites according to claim 1, wherein: The limit card slot is arc-shaped and has a U-shaped cross-section. It is buckled on the upper and lower sides of the inner support piece, the airbag and the outer support piece and is welded and fixed to the outer side of the outer support piece.

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