Strong permeability stratum shield construction grouting device in flowing water environment

Abstract

A grouting device for shield construction of a strong-permeability stratum in a dynamic water environment comprises a pipe piece provided with a grouting hole, an assembled grouting pipe and a grouting bag, the grouting bag is connected with the grouting pipe, the grouting pipe is inserted into the grouting hole in the pipe piece, the outer face of the pipe piece is coated with a bonding layer, and the inner face of the grouting bag and the outer face of the pipe piece are tightly bonded. The technology that the grouting bag is arranged outside the pipe piece is provided, grout can be prevented from being washed away by water, and the strength of the grout after solidification is guaranteed; the grouting range can be restrained, and the uncertainty of grout diffusion is solved; compared with double-liquid pulp, the single-liquid pulp has the advantages of simple and convenient process and low cost.

Description

Technical Field

[0001] The utility model relates to the technical field of shield tunnel construction, in particular to a shield construction grouting device for strong permeability strata in a dynamic water environment. Background Art

[0002] During shield construction, the cutterhead and shield body are larger than the outer diameter of the segments, creating gaps after the segments exit the shield tail. Current technologies primarily use simultaneous grouting and secondary grouting to fill these gaps and control surface subsidence. However, under the combined effects of grouting pressure and dynamic water pressure, the slurry easily forms permeable channels along the dominant path, resulting in uncontrollable slurry morphology and affecting the reinforcement and water-stopping effects behind the shield segments. Furthermore, dynamic water environments can cause slurry to be flushed out of highly permeable formations, leading to suboptimal grouting results. Summary of the Invention

[0003] The utility model aims to solve the deficiencies of the existing technology and provides a grouting device for shield construction in highly permeable strata under a dynamic water environment. The method proposes a technology of external grouting bags for pipe segments, and timely grouting is carried out after the pipe segments are separated from the shield tail. The grouting range is controlled by the grouting bags, which solves the uncertainty problems of slurry being flushed by groundwater and slurry diffusion, expands the application range of single-liquid grouting materials, and has the advantages of simple process and low cost compared with double-liquid slurry.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0005] A grouting device for shield construction in highly permeable strata under a dynamic water environment comprises a pipe segment with grouting holes, an assembled grouting pipe and a grouting bag. The grouting bag is connected to the grouting pipe, which is inserted into the grouting hole on the pipe segment. An adhesive layer is applied to the outside of the pipe segment, and the inner surface of the grouting bag is tightly adhered to the outer surface of the pipe segment.

[0006] The grouting pipe includes an inner grouting pipe and an outer grouting pipe. The outer side of one end of the inner grouting pipe is an external thread structure, and the inner side of one end of the outer grouting pipe is an internal thread structure. The inner grouting pipe is threadedly connected to the outer grouting pipe. The inner side of the inner grouting pipe is an internal thread structure. The other end of the outer grouting pipe is connected to two outer gaskets. The end of the outer grouting pipe close to the outer gasket is sleeved with the outer water stop strip, and the outer water stop strip is pressed tightly by the outer gasket. The other end of the inner grouting pipe is connected to the inner gasket. The end of the inner grouting pipe close to the inner gasket is sleeved with the inner water stop strip, and the inner water stop strip is pressed tightly by the inner gasket.

[0007] The pipe segment is provided with an outer groove at the position corresponding to the outer gasket at the grouting hole, and the outer water stop strip is installed in the outer groove of the pipe segment. The pipe segment is provided with an inner groove at the position corresponding to the inner gasket at the grouting hole, and the outer water stop strip is installed in the outer groove of the pipe segment. The inner grouting pipe and the outer grouting pipe are inserted into the grouting hole.

[0008] The inner grouting pipe and the outer grouting pipe are metal steel pipes, and the outer gasket and the inner gasket are metal gaskets.

[0009] The grouting bag is connected to the outer gasket, and the opening of the grouting bag is pressed tightly between the two outer gaskets.

[0010] The plane size of the grouting bag is consistent with the size of a single pipe segment, and the material thickness is 9mm.

[0011] The radial dimension of the grouting bag in the segment, that is, the thickness of the grouting body after the slurry solidifies, is not less than 1 / 2 of the difference between the excavation surface size and the outer diameter of the segment.

[0012] The outer waterstop strip and the inner waterstop strip are made of water-expanding rubber waterstop strips.

[0013] The beneficial effects of the present invention are as follows: the present invention proposes a technology of external grouting bags for pipe segments, which can prevent the slurry from being washed out by water and ensure the strength of the slurry after solidification; it can constrain the grouting range and solve the uncertainty of slurry diffusion; it expands the application range of single-liquid slurry and has the advantages of simple process and low cost compared with double-liquid slurry. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the shield construction structure in this utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the pipe segment and slurry bag after grouting of the utility model;

[0016] Figure 3 This is a schematic diagram of the grout bag structure after grouting of the utility model;

[0017] Figure 4 This is a schematic cross-sectional view of the tube segment and slurry bag structure of the utility model;

[0018] Figure 5 This is a schematic cross-sectional view of a grouting hole of the present invention;

[0019] Figure 6 This is an exploded view of the grouting pipe structure of the utility model;

[0020] In the figure: 1- grouting bag; 2- pipe segment; 3- shield tail; 4- grouting hole; 5- grouting pipe; 6- external grouting pipe; 7- external gasket; 8- external water stop; 9- internal grouting pipe; 10- internal water stop; 11- internal gasket;

[0021] The following is a detailed description of the embodiments of the utility model with reference to the accompanying drawings. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0023] like Figures 1-6 As shown, a grouting device for shield construction in highly permeable strata under a dynamic water environment includes a pipe segment 2 with a grouting hole 4, an assembled grouting pipe 5 and a grouting bag 1. The grouting bag 1 is connected to the grouting pipe 5, and the grouting pipe 5 is inserted into the grouting hole 4 on the pipe segment 2. An adhesive layer is applied to the outside of the pipe segment 2, and the inner surface of the grouting bag 1 is tightly adhered to the outer surface of the pipe segment 2.

[0024] The grouting pipe 5 includes an inner grouting pipe 9 and an outer grouting pipe 6. The outer side of one end of the inner grouting pipe 9 is an external thread structure, and the inner side of one end of the outer grouting pipe 6 is an internal thread structure. The inner grouting pipe 9 is threadedly connected to the outer grouting pipe 6, and the inner side of the inner grouting pipe 9 is an internal thread structure. The other end of the outer grouting pipe 6 is connected to two outer gaskets 7. The end of the outer grouting pipe 6 close to the outer gasket 7 is sleeved with the outer water stop strip 8, and the outer water stop strip 8 is pressed tightly by the outer gasket 7. The other end of the inner grouting pipe 9 is connected to the inner gasket 11. The end of the inner grouting pipe 9 close to the inner gasket 11 is sleeved with the inner water stop strip 10, and the inner water stop strip 10 is pressed tightly by the inner gasket 11.

[0025] The pipe segment 2 has an outer groove reserved at the position of the outer gasket 7 at the grouting hole 4, and the outer water stop strip 8 is installed in the outer groove of the pipe segment 2. The pipe segment 2 has an inner groove reserved at the position of the inner gasket 11 at the grouting hole 4, and the outer water stop strip 8 is installed in the outer groove of the pipe segment 2. The inner grouting pipe 9 and the outer grouting pipe 6 are inserted into the grouting hole 4.

[0026] The inner grouting pipe 9 and the outer grouting pipe 6 are metal steel pipes, and the outer gasket 7 and the inner gasket 11 are metal gaskets.

[0027] The grouting bag 1 is connected to the outer gasket 7, and the opening of the grouting bag 1 is pressed tightly between the two outer gaskets 7.

[0028] The plane size of the grouting bag 1 is consistent with the size of the single pipe segment 2, and the material thickness is 0.9 mm.

[0029] The radial dimension of the grouting bag 1 in the segment 2, that is, the thickness of the grouting body after the slurry solidifies, is not less than 1 / 2 of the difference between the excavation surface dimension and the outer diameter dimension of the segment 2.

[0030] The outer water stop strip 8 and the inner water stop strip 10 are made of water-expanding rubber water stop strips.

[0031] The application steps are:

[0032] S1. Grouting holes are reserved during the prefabrication of the pipe segment: a grouting hole 4 is reserved in the middle position of the pipe segment 2, and the grouting hole 4 runs through the pipe segment 2. The diameter of the grouting hole 4 is the same as the outer diameter of the grouting pipe 5; the grouting pipe 5 includes an inner grouting pipe 9 and an outer grouting pipe 6. The outer side of one end of the inner grouting pipe 9 is an outer thread structure, and the inner side of one end of the outer grouting pipe 6 is an inner thread structure. The inner grouting pipe 9 is threadedly connected to the outer grouting pipe 6, and the inner side of the inner grouting pipe 9 is an inner thread structure, which is convenient for connecting the grouting pipeline in the later stage to carry out grouting. The other end of the outer grouting pipe 6 is connected to two outer gaskets 7. The outer grouting pipe 6 is close to the outer gasket 7. One end is sleeved with an outer water stop strip 8, which is compressed by an outer gasket 7. The other end of the inner grouting pipe 9 is connected to the inner gasket 11. The end of the inner grouting pipe 9 close to the inner gasket 11 is sleeved with an inner water stop strip 10, which is compressed by the inner gasket 11. The inner grouting pipe 9 and the outer grouting pipe 6 are metal steel pipes, the outer gasket 7 and the inner gasket 11 are metal gaskets, and the outer water stop strip 8 and the inner water stop strip 10 are water-expanding rubber water stop strips; the pipe segment 2 is reserved with an outer groove at the position of the outer gasket 7 at the grouting hole 4, and an inner groove is reserved at the position of the inner gasket 11 at the outer grouting hole 4 of the pipe segment 2;

[0033] S2. Make the grouting bag: The grouting bag 1 is a closed bag structure, sewn with canvas material to achieve the effect of preventing grouting and water from seeping. The grouting bag 1 has holes at the positions corresponding to the grouting holes 4. The planar dimensions of the grouting bag 1 are consistent with the dimensions of the single segment 2 to ensure subsequent fitting. The material thickness of the grouting bag 1 is 0.9 mm. The radial dimension of the grouting bag 1 on the segment 2, that is, the thickness of the grouting body after the slurry solidifies, is not less than 1 / 2 of the difference between the excavation surface size and the outer diameter of the segment 2, to ensure that the pores on the outer side of the segment 2 are fully filled after the subsequent grouting.

[0034] S3, assembling the grouting bag and the pipe segment: After the pipe segment 2 is transported to the pipe segment yard, the grouting bag 1 is installed simultaneously with the installation of the water stop strip on the side of the pipe segment 2. The installation steps are as follows: P1, connecting the grouting bag 1 with the outer gasket 7, pressing the hole pocket body of the grouting bag 1 with two outer gaskets 7, and connecting the outer gasket 7 with the outer grouting pipe 6;

[0035] P2. Install the outer water stop strip 8 in the outer groove of the pipe segment 2, insert the outer grouting pipe 6 into the grouting hole 4 of the pipe segment 2, and press the outer gasket 7 against the outer water stop strip 8;

[0036] P3. Install the inner water stop strip 10 in the inner groove of the pipe segment 2, fix the inner grouting pipe 9 and the inner gasket 11, insert the inner grouting pipe 9 into the grouting hole 4, tighten the inner grouting pipe 9 and the outer grouting pipe 6, and press the inner water stop strip 10 with the inner gasket 11;

[0037] Apply a bonding layer to the outside of the pipe segment 2, and stick the inner surface of the grouting bag 1 to the outer surface of the pipe segment 2 tightly;

[0038] S4, assembling the segments into a ring: The segments 2 are transported to the assembly position of the shield machine by the segment vehicle for assembly of the segments 2; after the segments 2 are assembled into a ring, the grouting bags 1 are independent bags on the outside of each segment 2;

[0039] S5. Post-grouting of the segments: After the entire ring of segments 2 is removed from the shield tail 3, the grouting pipeline and the grouting pipe 5 are connected at the grouting hole 4, and cement single-liquid slurry is injected; the grouting sequence is from top to bottom, and the grouting volume and grouting pressure are monitored during the grouting process. After the grouting is completed, the grouting hole 4 is sealed.

[0040] In the description of the utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the utility model and simplifying the description, 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 on the utility model.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of a utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0042] In the utility model, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be interpreted broadly. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components, unless otherwise expressly limited. Those skilled in the art will understand the specific meanings of the above terms in the utility model based on the specific circumstances.

[0043] The utility model is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the utility model is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the utility model, or they are directly applied to other occasions without improvement, they are all within the scope of protection of the utility model.

Claims

1. A grouting device for shield construction in highly permeable strata under a dynamic water environment, characterized in that: The invention comprises a pipe segment (2) with a grouting hole (4), an assembled grouting pipe (5) and a grouting bag (1), wherein the grouting bag (1) is connected to the grouting pipe (5), the grouting pipe (5) is inserted into the grouting hole (4) on the pipe segment (2), an adhesive layer is applied to the outside of the pipe segment (2), and the inner surface of the grouting bag (1) is adhered tightly to the outer surface of the pipe segment (2); The grouting pipe (5) comprises an inner grouting pipe (9) and an outer grouting pipe (6), the outer side of one end of the inner grouting pipe (9) is an outer thread structure, the inner side of one end of the outer grouting pipe (6) is an inner thread structure, the inner grouting pipe (9) is threadedly connected to the outer grouting pipe (6), the inner side of the inner grouting pipe (9) is an inner thread structure, the other end of the outer grouting pipe (6) is connected to two outer gaskets (7), one end of the outer grouting pipe (6) close to the outer gasket (7) is sleeved with an outer water stop strip (8), and the outer water stop strip (8) is pressed tightly by the outer gasket (7), the other end of the inner grouting pipe (9) is connected to the inner gasket (11), and one end of the inner grouting pipe (9) close to the inner gasket (11) is sleeved with an inner water stop strip (10), and the inner water stop strip (10) is pressed tightly by the inner gasket (11).

2. The grouting device for shield construction in highly permeable strata under a dynamic water environment according to claim 1, characterized in that: The pipe segment (2) is provided with an outer groove at a position corresponding to the outer gasket (7) at the grouting hole (4), the outer water stop strip (8) is installed in the outer groove of the pipe segment (2), the pipe segment (2) is provided with an inner groove at a position corresponding to the inner gasket (11) at the grouting hole (4), and the inner grouting pipe (9) and the outer grouting pipe (6) are inserted into the grouting hole (4).

3. The grouting device for shield construction in highly permeable strata under a dynamic water environment according to claim 2, characterized in that: The inner grouting pipe (9) and the outer grouting pipe (6) are metal steel pipes, and the outer gasket (7) and the inner gasket (11) are metal gaskets.

4. The grouting device for shield construction in highly permeable strata under a dynamic water environment according to claim 3, characterized in that: The grouting bag (1) is connected to the outer gasket (7), and the opening of the grouting bag (1) is pressed tightly between the two outer gaskets (7).

5. The grouting device for shield construction in highly permeable strata under dynamic water environment according to claim 4, characterized in that: The plane size of the grouting bag (1) is consistent with the size of a single pipe segment (2).

6. The grouting device for shield construction in highly permeable strata under dynamic water environment according to claim 5, characterized in that: The radial dimension of the grouting bag (1) on the pipe segment (2), i.e., the thickness of the grouting body after the slurry solidifies, is not less than 1 / 2 of the difference between the excavation surface dimension and the outer diameter dimension of the pipe segment (2).

7. The grouting device for shield construction in highly permeable strata under dynamic water environment according to claim 1, characterized in that: The outer water stop strip (8) and the inner water stop strip (10) are made of water-expanding rubber water stop strips.

Images