Recyclable shield segment wall back deep hole grouting device

Abstract

The utility model discloses a recoverable shield segment wall back deep hole grouting device which comprises a grouting guide pipe, the end, facing soil, of the grouting guide pipe is of a conical structure, the end, facing a grouting head, of the grouting guide pipe is provided with threads of an external thread and reverse thread structure, and the inner wall of the grouting head is provided with threads of an internal thread and reverse thread structure which are connected with the grouting guide pipe in a threaded mode. According to the device, the problem of conventional secondary grouting measures in the existing shield construction process is solved, secondary grout can be diffused to the outer wall of a duct piece through a guide pipe, and a soil layer is disturbed by a hardened synchronous grout external cutterhead; the phenomenon that synchronous grouting filling is not full can be supplemented, and the soft soil layer on the outer wall of the filling segment can be reinforced.

Description

Technical Field

[0001] The utility model relates to the field of shield construction wall back grouting and deep hole soil layer reinforcement, in particular to a recyclable shield segment wall back deep hole grouting device. Background Art

[0002] In the current conventional shield wall back grouting process, the grouting head is connected to the pre-embedded sleeve of the segment for grouting, and the slurry mainly acts on the outer surface of the segment. The hydraulic applicability is strong at the hard rock end of the full section, but the grouting effect is poor in the soft soil layer and the soft soil layer of the segment just out of the shield tail. The grouting effect of the shield shell is relatively large. At present, the secondary grouting with conventional grouting heads cannot meet the reinforcement of the deep cutter head disturbed soil layer, and there is also a high safety risk in grouting near the shield tail; therefore, it is necessary to design a recyclable shield segment wall back deep hole grouting device to solve the above problems. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a deep hole grouting device behind the wall of a recyclable shield segment, which aims to solve the problems of conventional secondary grouting measures in the existing shield construction process, and can make the secondary slurry diffuse through the conduit to the hardened synchronous slurry external cutter head disturbed soil layer on the outer wall of the segment, which can not only supplement the incomplete filling phenomenon of the synchronous grouting, but also reinforce the soft soil layer on the outer wall of the filled segment.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a deep hole grouting device behind the wall of a recoverable shield segment, including a grouting conduit, the end of the grouting conduit facing the soil is a conical structure, the end of the grouting conduit facing the grouting head is provided with a thread of an outer thread reverse thread structure, and the inner wall of the grouting head is provided with a thread of an inner thread reverse thread structure connected to the thread of the grouting conduit.

[0005] Furthermore, the grouting conduit has a length of 800 mm and a diameter of 25 mm; it is suitable for the 400 mm segment behind the wall, and can ensure that the slurry directly enters the soil layer that has been disturbed by the shield machine cutter head but not filled by the synchronous grouting.

[0006] Preferably, the port of the conical structure is a circular opening, and a plurality of slope openings are symmetrically provided on the side surface of the conical structure.

[0007] Furthermore, the four openings on the side of the conical structure plus the circular opening welded on the front ensure that the slurry spreads in time.

[0008] Preferably, the outer surface of one end of the grouting head connected to the grouting conduit is provided with a thread with an external thread positive thread structure, which is threadedly connected to the embedded sleeve of the grouting hole, ensuring the convenience of reversing the grouting head and withdrawing from the conduit at the same time when the slurry initially sets.

[0009] Preferably, the outer surface of one end of the grouting head connected to the grouting ball valve is a hexagonal edge structure, and the inner wall is provided with a positive thread to cooperate with the grouting ball valve.

[0010] Furthermore, when deep hole grouting is carried out to reinforce the soil layer, the grouting conduit and the grouting head are connected into a reliable whole through the reverse thread, and inserted into the grouting hole to reinforce the stratum. After the reinforcement grouting is completed, the grouting head and the grouting conduit can be disassembled as a whole and then separated, so that the grouting head can be reused separately for conventional segment wall backfilling.

[0011] The utility model has the following technical effects:

[0012] The utility model provides a recyclable deep hole grouting device behind the shield segment wall, which can not only supplement the insufficient synchronous grouting slurry behind the soft soil layer segment wall, but also fill and reinforce the disturbed soil layer that cannot be reinforced by synchronous grouting outside the diameter of the reinforced cutter disc, and is suitable for the deep grouting of soft soil behind the segment wall near the shield tail, avoiding the flow of grouting slurry near the shield tail to the shield body and the soil bin. It is simple, practical, reusable, easy to construct and has good stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 It is a structural schematic diagram of the grouting head in the utility model;

[0016] Figure 3 It is a schematic diagram of the utility model during construction;

[0017] Explanation of the numbers in the figure: grouting pipe 1, conical structure 2, grouting head 3, soil on the outer wall of the segment 4, segment 5, synchronous slurry behind the segment wall 6. DETAILED DESCRIPTION

[0018] like Figure 1~2 As shown, a deep hole grouting device for recoverable shield segment wall comprises a grouting conduit 1, the end of the grouting conduit 1 facing the soil is a conical structure 2, the end of the grouting conduit 1 facing the grouting head 3 is provided with a thread of an outer thread reverse thread structure, and the inner wall of the grouting head 3 is provided with a thread of an inner thread reverse thread structure which is threadedly connected to the grouting conduit 1.

[0019] Furthermore, the grouting conduit 1 is 800 mm long and 25 mm in diameter; it is suitable for the 400 mm segment behind the wall, and can ensure that the slurry directly enters the soil layer that has been disturbed by the shield machine cutter head but not filled by the synchronous grouting.

[0020] Preferably, the port of the conical structure 2 is a circular opening, and a plurality of slope openings are symmetrically provided on the side surface of the conical structure 2 .

[0021] Furthermore, the four openings on the side of the conical structure plus the circular opening welded on the front ensure that the slurry spreads in time.

[0022] Preferably, the outer surface of one end of the grouting head 3 connected to the grouting conduit 1 is provided with a thread with an external thread positive thread structure, which is threadedly connected to the pre-buried sleeve of the grouting hole, ensuring the convenience of reversing the grouting head 3 and withdrawing from the conduit at the same time when the slurry initially sets.

[0023] Preferably, the outer surface of one end of the grouting head 3 connected to the grouting ball valve is a hexagonal edge structure, and the inner wall is provided with a positive thread to cooperate with the grouting ball valve.

[0024] Furthermore, when deep hole grouting is performed to reinforce the soil layer, the grouting conduit 1 and the grouting head 3 are connected into a reliable whole through the reverse thread, and inserted into the grouting hole to reinforce the stratum. After the reinforcement grouting is completed, the grouting head 3 and the grouting conduit 1 can be disassembled as a whole and then separated, so that the grouting head 3 can be reused separately for conventional segment wall back grouting.

[0025] The working principle of the utility model is:

[0026] like Figure 3 As shown, the thickness of the concrete layer of the segment grouting hole is 100mm and the thickness of the synchronous slurry filling layer behind the segment wall is 170mm. A water drill or an electric drill with a 28mm diameter drill bit is used to make a hole; the guide tube and the grouting head 3 are fastened by threads; the grouting device behind the segment wall is installed to the drilled segment grouting hole, and the outer threads at the front end of the grouting head 3 are fastened and connected with the embedded sleeve of the segment grouting hole; the grouting ball valve and the grouting pipe are connected to start the grouting reinforcement work behind the wall; after the grouting reinforcement behind the segment wall is completed, the grouting ball valve is opened every hour to check whether there is back slurry, and when the slurry is initially solidified, the grouting device behind the segment wall is disassembled into a sleeve with a pipe clamp tool, and the device is cleaned and stored for use.

[0027] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limitations of the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A deep hole grouting device for recoverable shield segment wall, characterized in that: The invention comprises a grouting conduit (1), wherein the end of the grouting conduit (1) facing the soil is a conical structure (2), the end of the grouting conduit (1) facing the grouting head (3) is provided with a thread with an outer thread reverse thread structure, and the inner wall of the grouting head (3) is provided with a thread with an inner thread reverse thread structure which is threadedly connected to the grouting conduit (1).

2. The deep hole grouting device behind the wall of a recoverable shield segment according to claim 1 is characterized in that: The port of the conical structure (2) is a circular opening, and a plurality of slope openings are symmetrically provided on the side surface of the conical structure (2).

3. The deep hole grouting device behind the wall of a recoverable shield segment according to claim 1 is characterized in that: The outer surface of one end of the grouting head (3) connected to the grouting conduit (1) is provided with a thread with an external thread positive thread structure, which is threadedly connected to the pre-buried casing of the grouting hole.

4. The deep hole grouting device behind the wall of a recoverable shield segment according to claim 1 is characterized in that: The outer surface of one end of the grouting head (3) connected to the grouting ball valve is a hexagonal edge structure, and the inner wall is provided with a positive thread to cooperate with the grouting ball valve.

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