A multifunctional grouting structure and construction method

Abstract

The invention relates to a multifunctional grouting structure, comprising an inner steel pipe and an outer steel pipe which are coaxially arranged, wherein the inner steel pipe can rotate inside the outer steel pipe; the inner and outer steel pipes are divided into a bag section and a non-bag section, and a bag is tied outside the bag section of the outer steel pipe; the positions of the openings of the bag section of the outer steel pipe and the openings of the non-bag section of the outer steel pipe are staggered by a set angle, and the positions of the openings of the bag section of the inner steel pipe and the openings of the non-bag section of the inner steel pipe are staggered by a set angle; the openings of the bag section of the outer steel pipe have the same height as the openings of the bag section of the inner steel pipe and correspond one to one; the openings of the non-bag section of the outer steel pipe have the same height as the openings of the non-bag section of the inner steel pipe and correspond one to one.

Description

Technical Field

[0001] The invention relates to the field of foundation pit engineering, and in particular to a multifunctional grouting structure and a construction method. Background Art

[0002] Foundation pit excavation will cause settlement and displacement of the surrounding strata, thus affecting the safety of nearby pipelines, subway tunnels, and buildings (hereinafter referred to as protected objects).

[0003] At present, grouting and other measures are often used to reinforce the soil layer and control deformation. For example:

[0004] The Chinese patent "Tracking Compensation Grouting Method for Controlling Ground Displacement" with a publication date of July 31, 2002 and publication number of CN00135198.2 uses a grouting pipe to supplement the grouting of the ground, and the grout spreads to the surrounding soil;

[0005] The Chinese patent document "A method and device for controlling deformation of soil around a foundation pit" with a publication date of November 6, 2018 and publication number CN108755699A proposed using bag grouting to control the deformation of the soil.

[0006] Both of the above methods have certain limitations. For diffusion grouting, the slurry is easy to scatter, and the grouting reinforcement effect is not good for soil layers with poor permeability such as silt and clay. For bag grouting, the bag restricts the diffusion of the slurry, and deformation control is only achieved by squeezing the soil through the bag. It is difficult to effectively reinforce the surrounding soil, and the effect is not good for fill and sand with high permeability.

[0007] At present, there is still a lack of a multifunctional grouting structure and construction method that is suitable for various soil layers and integrates bag grouting and diffusion grouting. Summary of the invention

[0008] The purpose of the present invention is to provide a multifunctional grouting structure and construction method, which can flexibly switch between bag grouting and diffusion grouting according to the characteristics of soil layers at different depths, so as to reinforce the soil and control soil deformation by squeezing soil with bags.

[0009] The present invention adopts the following technical solutions:

[0010] A multifunctional grouting structure comprises an inner steel pipe 6 and an outer steel pipe 1 which are coaxially arranged, wherein the inner steel pipe 6 can rotate inside the outer steel pipe 1; the inner and outer steel pipes are divided into a bag section and a non-bag section, and a bag 2 is tied outside the bag section of the outer steel pipe; the positions of an opening 12 of the bag section of the outer steel pipe and an opening 3 of the non-bag section of the outer steel pipe are staggered by a set angle, and the positions of an opening 7 of the bag section of the inner steel pipe and an opening 13 of the non-bag section of the inner steel pipe are staggered by a set angle; the opening 12 of the bag section of the outer steel pipe and the opening 7 of the bag section of the inner steel pipe are at the same height and correspond one to one; the opening 3 of the non-bag section of the outer steel pipe and the opening 13 of the non-bag section of the inner steel pipe are at the same height and correspond one to one.

[0011] Preferably, the inner steel tube 6 and the outer steel tube 1 fit as closely as possible.

[0012] Preferably, the bag 2 is connected to the outer steel pipe 1 via a buckle 4 to ensure that the slurry does not leak.

[0013] Preferably, the bag section and non-bag section of each of the inner and outer steel pipes are connected in sections by threads 8 or welding.

[0014] Furthermore, the gap between the inner steel tube 6 and the outer steel tube 1 is 0.5-2 mm.

[0015] Preferably, the set angle is 90°.

[0016] A construction method for the above-mentioned multifunctional grouting structure includes the following steps: when diffusion grouting is required, the inner steel pipe 6 is rotated so that the opening 3 of the non-bag section of the outer steel pipe is aligned with the opening 13 of the non-bag section of the inner steel pipe, and diffusion grouting can be performed; when bag grouting is required, the inner steel pipe 6 is rotated so that the opening 12 of the bag section of the outer steel pipe is aligned with the opening 7 of the bag section of the inner steel pipe, and bag grouting can be performed.

[0017] Preferably, the power for rotating the inner steel tube 6 comes from a machine or a wrench.

[0018] The beneficial effects of the present invention are:

[0019] 1) It combines bag grouting and diffusion grouting to achieve multifunctional application of a single device, which can not only reinforce the soil, but also control soil deformation by squeezing soil through bags;

[0020] 2) It is applicable to different strata and can be set according to different strata. For soil layers with high permeability (fill soil, sandy soil), diffusion grouting can be used, and for soil layers with low permeability (sandy soil), bag grouting can be used;

[0021] 3) The same device can be used for different soil layer areas and can be set to use different grouting materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a multifunctional grouting structure elevation;

[0023] Figure 2 is a cross-sectional view of a multifunctional grouting structure; where (a) is Figure 1 The AA section view in (b) is Figure 1 The BB section view in (c) is Figure 1 CC section view in.

[0024] Figure 3 It is a schematic diagram of the construction process of the multifunctional grouting structure, including (a) a hole-making step, (b) a step of placing the multifunctional grouting structure, (c) a step of backfilling sand and sealing materials, and (d) a step of rotating the inner steel pipe and continuing the grouting step. DETAILED DESCRIPTION

[0025] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0026] See also Figure 1-Figure 3 A multifunctional grouting structure comprises an inner steel pipe 6 and an outer steel pipe 1 which are coaxially arranged, and the inner steel pipe 6 can rotate inside the outer steel pipe 1; the inner and outer steel pipes are divided into a bag section and a non-bag section, and a bag 2 is tied outside the bag section of the outer steel pipe; the positions of the opening 12 of the bag section of the outer steel pipe and the opening 3 of the non-bag section of the outer steel pipe are staggered by a set angle, and the positions of the opening 7 of the bag section of the inner steel pipe and the opening 13 of the non-bag section of the inner steel pipe are staggered by a set angle; the opening 12 of the bag section of the outer steel pipe and the opening 7 of the bag section of the inner steel pipe are at the same height and correspond one to one; the opening 3 of the non-bag section of the outer steel pipe and the opening 13 of the non-bag section of the inner steel pipe are at the same height and correspond one to one.

[0027] In this embodiment, see Figure 3 (d) The inner steel tube 6 and the outer steel tube 1 fit as closely as possible.

[0028] In this embodiment, see Figure 1 The bag 2 is connected to the outer steel pipe 1 through a buckle 4 to ensure that the slurry does not leak.

[0029] In this embodiment, see Figure 1 The bag section and non-bag section of the inner and outer steel pipes are connected in sections by threads 8 or welding.

[0030] In this embodiment, the gap between the inner steel tube 6 and the outer steel tube 1 is 0.5-2 mm.

[0031] In this embodiment, see Figure 1 , the set angle is 90°.

[0032] See also Figure 3,The soil layers are divided into fill, silt, sand, soft clay, and sand from top to bottom; The construction of the multifunctional grouting structure includes the following steps:

[0033] (a) Drilling: Drill holes in the area between the retaining structure and the pipeline;

[0034] (b) placing the multifunctional grouting structure: placing the multifunctional grouting structure in the formed hole;

[0035] (c) Backfill with sand and sealing materials;

[0036] (d) Rotate the inner steel pipe and continue grouting, wherein:

[0037] When diffusion grouting is required, rotate the inner steel pipe 6 so that the opening 3 of the non-bag section of the outer steel pipe is aligned with the opening 13 of the non-bag section of the inner steel pipe, and diffusion grouting can be performed; when bag grouting is required, rotate the inner steel pipe 6 so that the opening 12 of the bag section of the outer steel pipe is aligned with the opening 7 of the bag section of the inner steel pipe, and bag grouting can be performed.

[0038] The power for rotating the inner steel pipe 6 comes from a machine or a wrench.

[0039] The above are preferred embodiments of the present invention. A person skilled in the art may make various changes or improvements on this basis. Without departing from the general concept of the present invention, these changes or improvements should fall within the scope of protection required by the present invention.

Claims

1. A multifunctional grouting structure, characterized in that: It comprises an inner steel pipe (6) and an outer steel pipe (1) which are coaxially arranged, and the inner steel pipe (6) can rotate inside the outer steel pipe (1); The inner and outer steel pipes are divided into corresponding bag sections and non-bag sections, and a bag (2) is tied outside the bag section of the outer steel pipe; The positions of the opening (12) of the outer steel tube bag section and the opening (3) of the outer steel tube non-bag section are staggered by a set angle. The positions of the opening (7) of the inner steel tube bladder section and the opening (13) of the inner steel tube non-bladder section are staggered by a set angle; The openings (12) of the outer steel tube bag section and the openings (7) of the inner steel tube bag section are at the same height and correspond one to one; The openings (3) of the non-bladder section of the outer steel tube and the openings (13) of the non-bladder section of the inner steel tube are at the same height and correspond one to one; When diffusion grouting is required, the inner steel pipe (6) is rotated so that the opening (3) of the non-bag section of the outer steel pipe is aligned with the opening (13) of the non-bag section of the inner steel pipe, and diffusion grouting can be performed; when bag grouting is required, the inner steel pipe (6) is rotated so that the opening (12) of the bag section of the outer steel pipe is aligned with the opening (7) of the bag section of the inner steel pipe, and bag grouting can be performed.

2. The multifunctional grouting structure according to claim 1, characterized in that: The inner steel pipe (6) and the outer steel pipe (1) fit as closely as possible.

3. The multifunctional grouting structure according to claim 1, characterized in that: The bladder bag (2) is connected to the outer steel pipe (1) via a buckle (4) to ensure that no slurry leaks.

4. The multifunctional grouting structure according to claim 1, characterized in that: The bag section and non-bag section of the inner and outer steel pipes are connected in sections by threads (8) or welding.

5. The multifunctional grouting structure according to claim 2, characterized in that: The gap between the inner steel tube (6) and the outer steel tube (1) is 0.5-2 mm.

6. The multifunctional grouting structure according to claim 1, characterized in that: The setting angle is 90°.

7. The multifunctional grouting structure according to claim 1, characterized in that: The power for rotating the inner steel pipe (6) comes from a machine or a wrench.

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