A segmented grouting reinforcement process for operating subway tunnels

Abstract

The present application relates to the field of tunnel reinforcement engineering, and specifically discloses a segmented grouting reinforcement process for operating subway tunnels, which is characterized by comprising the following steps: 1) determining the area to be reinforced and marking it; 2) reinforcing the reinforced area by segmented drilling and grouting reinforcement; the segmented drilling and grouting reinforcement is reinforced from the outside to the inside in sequence, and when reinforcing the latter reinforcement section, the drill rod needs to pass through all the previous reinforcement sections, and after the last reinforcement section is reinforced, the drill holes formed by the drill rod in all the previous reinforcement sections are supplemented. The reinforcement process designed in the present application can be applied to the tunnel reinforcement of operating subways.

Description

Technical Field

[0001] The present application relates to the field of tunnel reinforcement, and in particular to a segmented grouting reinforcement process for operating subway tunnels. Background Art

[0002] Subway construction projects all face the basic problem of deep and soft soil layers, which can easily cause tunnel segments to sink, crack, seep, and deform, thus causing safety hazards in subway operations. These problems pose severe challenges to the development of modern urban rail transit.

[0003] There are two main methods for tunnel processing. One is to reinforce the tunnel inner wall with a reinforcement frame and fill the reinforcement frame with concrete for reinforcement. The other is to reinforce with jet grouting piles. The first method has low reinforcement efficiency, so the mainstream method is to reinforce with jet grouting piles.

[0004] However, due to the limited construction time in the operating subway, the window period is 4 hours. Excluding the time for construction preparation and completion, the actual time for pile formation is generally only 2 hours, which is not enough to complete the grouting of a jet grouting pile. Therefore, there is no mature reinforcement technology that can be applied to operating subway tunnels. The existing method is to reinforce the tunnel by stopping operation. Summary of the invention

[0005] In order to improve the above problems, the present application provides a segmented grouting reinforcement process for operating subway tunnels.

[0006] The present application provides a segmented grouting reinforcement process for a running subway tunnel using the following technical solutions:

[0007] A segmented grouting reinforcement process for a running subway tunnel, characterized in that it comprises the following steps:

[0008] 1) Identify the areas that need reinforcement and mark them;

[0009] 2) The reinforcement area is reinforced by means of segmented drilling and grouting reinforcement;

[0010] The segmented drilling and grouting reinforcement is carried out from the outside to the inside. When reinforcing the last reinforcement section, the drill rod needs to pass through all the previous reinforcement sections. After the reinforcement of the last reinforcement section is completed, the drill holes formed by the drill rod in all the previous reinforcement sections are supplemented.

[0011] Optionally, grouting reinforcement is carried out by rotary jet grouting.

[0012] Optionally, drilling and grouting are performed in existing lifting holes of the tunnel segments or in newly drilled holes.

[0013] Optionally, after each grouting is completed, the holes on the pipe segment need to be sealed by a sealing device.

[0014] Optionally, the sealing devices all have guide columns inserted into the reinforcement section, the outer wall of the guide columns is coated with a release agent, the guide columns are positioned in the forward direction of the drill rod, and except for the sealing device used for the last reinforcement, the lengths of the guide columns of the remaining sealing devices are at least equal to the sum of the lengths of the current reinforcement sections.

[0015] Optionally, one end of the guide column has a guide structure to facilitate the guide column to be inserted into the reinforcement section.

[0016] Optionally, the blocking device includes a guide column, a first through hole is provided on the guide column along its radial direction and passes through the outer wall of the guide column, and a limit column that can move relative to the first through hole is arranged in the first through hole; a second through hole is provided on the guide column along its axial direction and has one end passing through the end wall of the guide column, the second through hole is connected to the first through hole, and a pushing block that can move relative to the second through hole is arranged in the second through hole, the pushing block has a pushing part, the limit column and the pushing part are transmitted by an inclined plane and can drive the limit column to move radially out of the first through hole when the pushing part moves axially; an abutment ring is also threadedly connected to the guide column, and a side surface of the abutment plate has a rubber ring.

[0017] The pushing block is threadedly connected to the second through hole, and a handle is fixed on the pushing block.

[0018] Optionally, an operating groove is provided on the surface of the limiting column, and a supporting protrusion is fixed on the inner wall of the second through hole.

[0019] In summary, the present application includes at least one of the following beneficial technical effects: the present application solves the problem in the prior art that tunnels in running subways cannot be reinforced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a construction process progress diagram of an embodiment of the present application;

[0021] Figure 2 It is a schematic diagram of the structure of the plugging device.

[0022] Figure numerals: 1. drill rod; 2. reinforcement section; 3. guide column; 4. first through hole; 5. limit column; 6. second through hole; 7. push block; 8. push part; 9. abutment ring; 10. rubber ring; 11. operating groove; 12. support protrusion; 13. tunnel segment; 14. handle. DETAILED DESCRIPTION

[0023] The following is combined with Figure 1-2 This application is described in further detail.

[0024] The embodiment of the present application discloses a segmented grouting reinforcement process for a running subway tunnel (an optimization of a traditional TJS method), comprising the following steps:

[0025] 1) Identify the areas that need reinforcement and mark them;

[0026] 2) The reinforcement area is reinforced by means of segmented drilling and grouting reinforcement;

[0027] The segmented drilling and grouting reinforcement is carried out from the outside to the inside. When reinforcing the latter reinforcement section 2, the drill rod 1 needs to pass through all the previous reinforcement sections 2. After the reinforcement of the last reinforcement section 2 is completed, the drill holes formed by the drill rod 1 in all the previous reinforcement sections 2 are supplemented.

[0028] For 1), laser alignment can be used, or coloring can be used in the reinforcement area. For drilling and grouting, select the existing hoisting holes or newly opened holes in the tunnel segment 13. Selecting existing hoisting holes can speed up the construction period, so it is preferred to select existing hoisting holes or other existing holes in the tunnel segment 13. If there is no corresponding hoisting hole in the reinforcement area, a new hole can be used.

[0029] For 2), the drill rod 1 is a hollow borehole, so grouting can be performed when the borehole is completed, and the grouting reinforcement adopts the method of rotary jet grouting. And the existing hoisting holes or newly opened holes of the tunnel segment 13 are selected for drilling grouting to prevent the slurry from flowing out.

[0030] The plugging devices all have a guide column 3 inserted into the reinforcement section 2, and one end of the guide column 3 has a guide structure so that the guide column 3 can be inserted into the reinforcement section 2. A release agent is applied to the outer wall of the guide column 3 to facilitate the separation of the guide column 3 from the solidified reinforcement section 2. The guide column 3 is located in the forward direction of the drill pipe 1. A first through hole 4 is opened on the guide column 3 along its radial direction and penetrates the outer wall of the guide column 3. A limiting column 5 that can move relative to the first through hole 4 is arranged in the first through hole 4; the limiting column 5 is a column with a rectangular cross-section, and two limiting columns 5 are symmetrically arranged. A second through hole 6 is provided on the guide column 3 along its axial direction, and one end of the second through hole 6 passes through the end wall of the guide column 3. The second through hole 6 is connected to the first through hole 4. A push block 7 that can move relative to the second through hole 6 is arranged in the second through hole 6. The push block 7 has a push portion 8. The limit column 5 and the push portion 8 are driven by an inclined surface and can drive the limit column 5 to move radially out of the first through hole 4 when the push portion 8 moves axially. The guide column 3 is also threadedly connected with an abutment ring 9, and a side surface of the abutment plate has a rubber ring 10. The push block 7 is threadedly connected with the second through hole 6, and the push portion 8 is in abutment with the push block 7. A handle 14 is fixed on the push block 7.

[0031] Since the blocking device needs to be removed, an operating groove 11 is provided on the surface of the limiting column 5. After the push block 7 is screwed out, a tool such as an opener is inserted into the operating groove 11. A supporting protrusion 12 is fixed on the inner wall of the second through hole 6, and the middle part of the opener can abut against the supporting protrusion 12, so that the limiting column 5 can be easily disengaged by using the lever principle.

[0032] The implementation principle of the segmented grouting reinforcement process for a subway tunnel in the present application embodiment is as follows: This embodiment takes a single reinforcement area as an example requiring three grouting reinforcements, which means that three reinforcement sections 2 are to be formed. Figure 1 , the arrow direction is the process of three reinforcement sections being formed in sequence. If the depth of the reinforcement area is 3a, and the depth of each reinforcement is a, then the depth of the first reinforcement drilling is a, and then the first rotary jet grouting is performed to fill the area with slurry. Block the entry hole on the tunnel segment 13 to prevent the slurry from flowing out. Use a blocking device for blocking, and the length of the guide column 3 of the blocking device is a. In fact, due to the thickness of the segment h, the length of the guide column 3 of this blocking device is at least a+h. In this way, when drilling is required for the second time, after the blocking device is taken out, the drilling can directly pass through the hole formed by the guide column 3 to reach the soil layer where drilling is required for the second time. Since the guide column 3 is inserted, the slurry will flow out of the entry hole. After part of the slurry flows out, the abutment ring 9 is rotated to make the rubber ring 10 abut against the tunnel segment 13 for sealing. During the reinforcement on the second day, the blocking device is removed. The theoretical drilling depth today is 2a, but due to the existence of the guide column 3, the actual drilling depth is a, and the drilling does not need to be drilled through the solidified reinforcement area. After drilling, the same method is used to seal the hole. At this time, the length of the guide column 3 is at least 2a+h. The theoretical drilling depth during the reinforcement on the third day is 3a, and the actual drilling depth is a. On the third day, in addition to filling the holes opened today, the holes left by the guide column 3 need to be filled. At this time, the guide column 3 of the sealing device can be shorter, for example, 0.5a, as long as the limit column 5 and other structures can be set.

[0033] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, and a specific direction structure and operation, and therefore, cannot be understood as a limitation on the present invention. In addition, "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it 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 a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A segmented grouting reinforcement process for a running subway tunnel, characterized in that: The steps include: 1) Identify the areas that need reinforcement and mark them; 2) The reinforcement area is reinforced by means of segmented drilling and grouting reinforcement; The segmented drilling and grouting reinforcement is carried out from the outside to the inside. When reinforcing the last reinforcement section, the drill rod needs to pass through all the previous reinforcement sections. After the reinforcement of the last reinforcement section is completed, the drill holes formed by the drill rod in all the previous reinforcement sections are supplemented.

2. The segmented grouting reinforcement process for a subway tunnel according to claim 1 is characterized in that: Grouting reinforcement adopts the method of rotary jet grouting.

3. The segmented grouting reinforcement process for a subway tunnel according to claim 1 is characterized in that: For drilling and grouting, select the existing lifting holes of the tunnel segments or newly opened holes.

4. The segmented grouting reinforcement process for a subway tunnel according to claim 1 is characterized in that: After each grouting is completed, the holes on the pipe segments need to be sealed using a sealing device.

5. The segmented grouting reinforcement process for a subway tunnel according to claim 4 is characterized in that: All the plugging devices have guide columns inserted into the reinforcement section, with release agent applied on the outer wall of the guide columns. The guide columns are located in the forward direction of the drill pipe. Except for the plugging device used for the last reinforcement, the length of the guide columns of the remaining plugging devices is at least equal to the sum of the lengths of the current reinforcement sections.

6. The segmented grouting reinforcement process for a subway tunnel according to claim 5, characterized in that: One end of the guide column is provided with a guide structure so that the guide column can be inserted into the reinforcement section.

7. The segmented grouting reinforcement process for a subway tunnel according to claim 5, characterized in that: The blocking device includes a guide column, a first through hole penetrating the outer wall of the guide column is provided on the guide column along its radial direction, a limit column that can move relative to the first through hole is arranged in the first through hole; a second through hole is provided on the guide column along its axial direction with one end penetrating the end wall of the guide column, the second through hole is connected to the first through hole, a pushing block that can move relative to the second through hole is arranged in the second through hole, the pushing block has a pushing part, the limit column and the pushing part are driven by an inclined plane and can drive the limit column to move radially out of the first through hole when the pushing part moves axially; an abutment ring is also threadedly connected to the guide column, and a side surface of the abutment plate has a rubber ring.

8. The segmented grouting reinforcement process for a subway tunnel according to claim 1, characterized in that: The pushing block is threadedly connected to the second through hole, and a handle is fixed on the pushing block.

9. The segmented grouting reinforcement process for a subway tunnel according to claim 1, characterized in that: An operating groove is provided on the surface of the limiting column, and a supporting protrusion is fixed on the inner wall of the second through hole.

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