Tunnel pressure grouting pipeline leak-proof device and operation method thereof

Abstract

The application discloses a tunnel pressure grouting pipeline leakage prevention device and an operating method thereof, and belongs to the technical field of tunnel engineering construction. The tunnel pressure grouting pipeline leakage prevention device comprises a one-way exhaust pipe and a series connection hose. One end of the one-way exhaust pipe is connected to an exhaust port at an eccentric position of a grouting hole. One end of the series connection hose is threadedly connected with the one-way exhaust pipe. The other end of the series connection hose is connected to a grouting inlet at a central position of an adjacent grouting hole. The application solves the problem that, in the prior art, grouting material is prone to overflowing and a front cavity phenomenon occurs and material is prone to being wasted due to the fact that, after grouting is completed, grouting material flows out of the exhaust hole and is blocked, and the blocking is not timely. In the application, the exhaust port of the grouting hole and the grouting inlet of the adjacent grouting hole are connected in series through the series connection hose and the one-way exhaust pipe. When grouting, the excess grouting material overflows from the exhaust port and enters the next grouting inlet, so that the two or more grouting holes are successively grouted, and the grouting effect is ensured.

Description

Technical Field

[0001] This invention relates to the field of tunnel engineering construction technology, specifically to a leak-proof device for tunnel grouting pipelines and its operation method. Background Technology

[0002] Grouting is an important component of tunnel and bridge engineering. Currently, grouting is used for pipe roofs and hollow anchors in tunnel engineering, as well as prestressing in bridge engineering. Grouting of ducts usually involves using cement slurry mixed with additives. Before grouting, the duct to be grouted is first flushed with pressurized water. Then, cement slurry is injected from one end of the duct, and the other end is sealed after the thick slurry is discharged to ensure the compactness of the duct. Traditionally, plastic pipes or steel pipes with manual valves are used as vents. During construction, after the grout is fully injected, the slurry flows out through the vent to block the duct. If the vent is not sealed in time, excess grout can easily overflow, resulting in voids at the front and wasting materials. Summary of the Invention

[0003] The purpose of this invention is to provide a leak-proof device for tunnel grouting pipes and its operation method. The vent of the grouting hole is connected in series with the inlet of the adjacent grouting hole through a series hose and a vent pipe. When grouting is injected into the inlet, excess grout overflows from the vent and enters the next inlet through the vent pipe and the series hose. This allows for the successive injection of grout into two or more grouting holes, ensuring the fullness and density of the grouting, and solving the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A leak-proof device for tunnel grouting pipes includes a one-way vent pipe and a series hose. One end of the one-way vent pipe is connected to the vent port at the eccentric position of the grouting hole, one end of the series hose is threadedly connected to the one-way vent pipe, and the other end of the series hose is connected to the grout inlet at the center position of the adjacent grouting hole.

[0006] Preferably, the one-way exhaust pipe includes an anti-detachment connector, a filter element, an exhaust pipe body, a one-way valve, and a spring. The anti-detachment connector is connected to one port of the exhaust pipe body. The filter element is installed in the inner cavity of the exhaust pipe body through the anti-detachment connector. The one-way valve is located in the inner cavity of the exhaust pipe body on the side away from the anti-detachment connector. The end of the exhaust pipe body near the one-way valve has an external thread. The spring is installed between the one-way valve and the external thread.

[0007] Preferably, the inner cavities at both ends of the series hose are provided with internal threads, and the internal threads and external threads are compatible.

[0008] Preferably, the exhaust port is provided with a connecting pipe, the outer peripheral surface of the connecting pipe is provided with a connector, the outer peripheral surface of the connector is provided with a thread, and the bottom surface of the connector is symmetrically provided with fixing buckles, the fixing buckles are in the shape of an "L" and are provided with a locking block.

[0009] Preferably, the filter element includes a pressure ring, connecting strips, and a filter screen. The pressure ring is connected to the filter screen through the connecting strips. Four connecting strips are symmetrically arranged. One end of the connecting strip is fixedly connected to the inner side wall of the pressure ring, and the other end of the connecting strip is fixedly connected to the bottom edge of the filter screen.

[0010] Preferably, the cross-section of the pressure ring is the same as the cross-section of the exhaust pipe body, the diameter of the filter screen is equal to the inner diameter of the exhaust pipe body, the pipe opening of the exhaust pipe body overlaps with the pressure ring, and the connecting strip and the filter screen are inserted into the inner cavity of the exhaust pipe body.

[0011] Preferably, the anti-detachment connector includes a leak-proof soft sleeve, a soft sleeve outer fixing sleeve, a compression spring, a thrust bearing, and a rotating sleeve. The exhaust pipe is inserted into the rotating sleeve and fixedly connected to the rotating sleeve. The inner wall of the rotating sleeve near the opening is provided with threads. The rotating sleeve is connected to the connector through the threads. The outer wall of the rotating sleeve is provided with a groove that matches the locking block.

[0012] Preferably, a thrust bearing is provided on the inner top surface of the rotating sleeve, a compression spring is fixed on the bottom surface of the thrust bearing, the bottom of the compression spring abuts against the top of the soft outer fixing sleeve, the outer peripheral surface of the soft outer fixing sleeve fits against the inner peripheral surface of the rotating sleeve, and the soft outer fixing sleeve is sleeved with the exhaust pipe body.

[0013] Preferably, a leak-proof soft sleeve is nested inside the outer fixing sleeve of the soft sleeve. The inner wall of the leak-proof soft sleeve fits against the outer wall of the exhaust pipe body and the connecting pipe. An inner ring is provided in the middle of the inner wall of the leak-proof soft sleeve, and a bottom ring is provided on the bottom surface of the leak-proof soft sleeve. The pipe opening of the exhaust pipe body abuts against the top surface of the inner ring through a pressure ring. The pipe opening of the connecting pipe passes through the leak-proof soft sleeve and abuts against the bottom surface of the inner ring. The top and bottom surfaces of the bottom ring abut against the outer fixing sleeve of the soft sleeve and the connecting piece, respectively.

[0014] An operation method for a tunnel grouting pipe leak prevention device, based on a tunnel grouting pipe leak prevention device, includes the following steps:

[0015] Step 1: Insert the connecting pipe into the leak-proof soft sleeve, and twist the rotating sleeve to make it engage with the threaded connection of the connector. After the end of the rotating sleeve contacts the locking block, the fixing buckle will deform outward until the connector is fully screwed into the rotating sleeve. Then, the locking block will be driven by the fixing buckle to lock into the slot. At this time, the exhaust pipe body and the connecting pipe are fully fitted and fixed with the leak-proof soft sleeve, realizing the connection of the exhaust pipe body and the connecting pipe.

[0016] Step 2: One end of the series hose is connected to the vent pipe body through the engagement of internal and external threads. The other end of the series hose is connected to the grout inlet of the adjacent grouting hole to realize the series connection between the grouting holes. When grouting is injected into the grout inlet, excess grout overflows from the vent and enters the next grout inlet through the vent pipe body and the series hose.

[0017] Step 3: After the grout has initially set, remove the exhaust pipe and the series hose.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. In this invention, the vent of the grouting hole is connected in series with the inlet of the adjacent grouting hole via a series hose and a vent pipe. When grouting into the inlet, excess grout overflows from the vent and enters the next inlet through the vent pipe and the series hose. This allows for the successive grouting of two or more grouting holes, ensuring the fullness and density of the grouting. This avoids grout leakage caused by failure to manually close the valve in time, and also avoids the waste of materials caused by repeatedly changing grouting equipment. This greatly improves construction efficiency and saves grouting materials.

[0020] 2. In this invention, the inner cavity of the exhaust pipe is equipped with a one-way valve to prevent backflow when grouting stops, and to prevent air from entering; an anti-detachment joint is set to make the connection between the exhaust pipe and the connecting pipe more secure; the anti-leakage soft sleeve is set to prevent grout from leaking out from the gaps between the pipes; and a detachable filter is set to filter the grout to ensure the grouting effect. Attached Figure Description

[0021] Figure 1 This is a diagram showing the overall structural connections of the present invention;

[0022] Figure 2 This is a plan view of the unidirectional exhaust pipe of the present invention;

[0023] Figure 3 This is a plan view of the series flexible tube of the present invention;

[0024] Figure 4 This is an exploded view of the anti-detachment connector of the present invention;

[0025] Figure 5 This is a cross-sectional view of the leak-proof soft sleeve of the present invention;

[0026] Figure 6 This is an isometric view of the nozzle and connector of the present invention;

[0027] Figure 7 This is an assembly cross-sectional view of the anti-detachment connector and connector of the present invention.

[0028] In the diagram: 1. One-way exhaust pipe; 11. Anti-detachment connector; 111. Leak-proof soft sleeve; 111a. Inner ring; 111b. Bottom ring; 112. Soft sleeve outer fixing sleeve; 113. Compression spring; 114. Thrust bearing; 115. Rotating sleeve; 116. Slot; 12. Filter element; 121. Pressure ring; 122. Connecting strip; 123. Filter screen; 13. Exhaust pipe body; 14. One-way valve; 15. Valve spring; 16. External thread; 2. Series hose; 21. Internal thread; 3. Grouting hole; 31. Exhaust port; 32. Grout inlet; 33. Connecting pipe; 34. Connecting piece; 35. Fixing buckle; 351. Locking block. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Existing technologies often result in excessive grout overflow and voids at the front end if sealing is not timely after grouting is complete, leading to material waste. To address these issues, please refer to [link to relevant documentation]. Figure 1-7 This embodiment provides the following technical solution:

[0031] A leak-proof device for tunnel grouting pipes includes a one-way vent pipe 1 and a series hose 2. One end of the one-way vent pipe 1 is connected to the vent 31 at the eccentric position of the grouting hole 3. One end of the series hose 2 is threadedly connected to the one-way vent pipe 1, and the other end of the series hose 2 is connected to the grout inlet 32 ​​at the center position of the adjacent grouting hole 3.

[0032] Specifically, the vent 31 of the grouting hole 3 is connected in series with the inlet 32 ​​of the adjacent grouting hole 3 through the series hose 2 and the vent pipe body 13. When grouting into the inlet 32, excess grout overflows from the vent 31 and enters the next inlet 32 ​​through the vent pipe body 13 and the series hose 2. In this way, two or more grouting holes 3 are grouted in succession to ensure the fullness and density of the grouting. This avoids the situation where grout leakage occurs due to the failure to close the valve in time, and also avoids the waste of materials caused by repeatedly changing the grouting equipment. This greatly improves the construction efficiency and saves grouting materials.

[0033] The one-way exhaust pipe 1 includes an anti-detachment connector 11, a filter element 12, an exhaust pipe body 13, a one-way valve 14, and a valve spring 15. The anti-detachment connector 11 is connected to one of the ports of the exhaust pipe body 13. The filter element 12 is installed in the inner cavity of the exhaust pipe body 13 through the anti-detachment connector 11. The one-way valve 14 is located in the inner cavity of the exhaust pipe body 13 on the side away from the anti-detachment connector 11. The exhaust pipe body 13 has an external thread 16 at the end near the one-way valve 14. The valve spring 15 is installed between the one-way valve 14 and the external thread 16. The inner cavities at both ends of the series hose 2 are provided with internal threads 21, and the internal threads 21 and the external threads 16 are compatible.

[0034] Specifically, a one-way valve 14 is installed to prevent backflow when grouting stops, and to prevent air from entering, thus ensuring the grouting effect; the exhaust pipe body 13 is connected to the series hose 2 through the cooperation of internal thread 21 and external thread 16; the exhaust pipe body 13 is made of PVC material.

[0035] The exhaust port 31 is provided with a pipe 33, and a connector 34 is provided on the outer peripheral surface of the pipe 33. The outer peripheral surface of the connector 34 is provided with threads, and the bottom surface of the connector 34 is provided with symmetrical fixing buckles 35. The fixing buckles 35 are in the shape of an "L" and are provided with a locking block 351.

[0036] Specifically, the connector 34 can be fixed to the pipe 33 by welding. The connector 34 is threadedly connected to the rotating sleeve 115. When the connector 34 is fully screwed into the rotating sleeve 115, the locking block 351 is pushed into the slot 116 by the elastic potential energy generated by the fixed buckle 35, so as to realize the engagement of the rotating sleeve 115 and the fixed buckle 35. The fixed buckle 35 and the locking block 351 can prevent the rotating sleeve 115 from rotating outside the connector 34 during grouting, which would affect the sealing effect of the leak-proof soft sleeve 111 on the exhaust pipe body 13 and the pipe 33.

[0037] The filter element 12 includes a pressure ring 121, a connecting strip 122, and a filter screen 123. The pressure ring 121 is connected to the filter screen 123 through the connecting strip 122. Four connecting strips 122 are symmetrically arranged. One end of the connecting strip 122 is fixedly connected to the inner side wall of the pressure ring 121, and the other end of the connecting strip 122 is fixedly connected to the bottom edge of the filter screen 123. The cross-section of the pressure ring 121 is the same as the cross-section of the exhaust pipe body 13. The diameter of the filter screen 123 is equal to the inner diameter of the exhaust pipe body 13. The opening of the exhaust pipe body 13 overlaps with the pressure ring 121. The connecting strip 122 and the filter screen 123 pass through the inner cavity of the exhaust pipe body 13.

[0038] Specifically, the filter screen 123 is attached to the opening of the exhaust pipe body 13 via the pressure ring 121 and extends into the inner cavity of the exhaust pipe body 13 via the connecting strip 122 to filter the flowing slurry. The filter screen 123 can be disassembled. After grouting and filtration are completed, the rotating sleeve 115 is removed. First, the leak-proof soft sleeve 111 inside the rotating sleeve 115 is removed, and then the pressure ring 121 is taken out. The pressure ring 121 carries the filter screen 123 out via the connecting strip 122, and the filter screen 123 carries out the accumulated filter residue.

[0039] The anti-detachment connector 11 includes a leak-proof soft sleeve 111, a soft sleeve outer fixing sleeve 112, a compression spring 113, a thrust bearing 114, and a rotating sleeve 115. The exhaust pipe body 13 passes through the rotating sleeve 115 and is fixedly connected to the rotating sleeve 115. The inner wall of the rotating sleeve 115 near the opening is provided with threads. The rotating sleeve 115 is connected to the connector 34 through the threads. The outer wall of the rotating sleeve 115 is provided with a slot 116 that matches the locking block 351.

[0040] A thrust bearing 114 is provided on the inner top surface of the rotating sleeve 115. A compression spring 113 is fixed on the bottom surface of the thrust bearing 114. The bottom of the compression spring 113 abuts against the top of the soft outer fixing sleeve 112. The outer circumferential surface of the soft outer fixing sleeve 112 fits against the inner circumferential surface of the rotating sleeve 115. The soft outer fixing sleeve 112 is sleeved with the exhaust pipe body 13.

[0041] The soft outer fixing sleeve 112 is nested inside the leak-proof soft sleeve 111. The inner wall of the leak-proof soft sleeve 111 fits against the outer wall of the exhaust pipe body 13 and the connecting pipe 33. The inner wall of the leak-proof soft sleeve 111 is provided with an inner ring 111a in the middle and a bottom ring 111b on the bottom surface of the leak-proof soft sleeve 111. The pipe opening of the exhaust pipe body 13 abuts against the top surface of the inner ring 111a through the pressure ring 121. The pipe opening of the connecting pipe 33 passes through the leak-proof soft sleeve 111 and abuts against the bottom surface of the inner ring 111a. The top and bottom surfaces of the bottom ring 111b abut against the soft outer fixing sleeve 112 and the connector 34, respectively.

[0042] Specifically, during the tightening process of the rotating sleeve 115 and the connector 34, the exhaust pipe body 13 and the pipe opening of the connecting pipe 33 abut against each other through the inner ring 111a, and the inner ring 111a seals the joint. The soft sleeve outer fixing sleeve 112 and the connector 34 abut against each other through the bottom ring 111b. At the same time, the thrust bearing 114 applies pressure to the soft sleeve outer fixing sleeve 112 through the compression spring 113, thereby applying pressure to the leak-proof soft sleeve 111, further making the leak-proof soft sleeve 111 fit tightly against the exhaust pipe body 13 and the connecting pipe 33, thereby achieving a seal at the pipe opening connection and preventing slurry leakage.

[0043] This embodiment proposes an operation method for a tunnel grouting pipeline leak prevention device, which is based on a tunnel grouting pipeline leak prevention device and includes the following steps:

[0044] Step 1: Insert the connector 33 into the leak-proof soft sleeve 111, and twist the rotating sleeve 115 to make it threadedly engage with the connector 34. After the port of the rotating sleeve 115 contacts the locking block 351, the fixing buckle 35 will deform outward until the connector 34 is fully screwed into the rotating sleeve 115. Then, the locking block 351 will be driven by the fixing buckle 35 to be locked into the slot 116. At this time, the exhaust pipe body 13 and the connector 33 are fully fitted and fixed with the leak-proof soft sleeve 111, realizing the connection of the exhaust pipe body 13 and the connector 33.

[0045] Step 2: One end of the series hose 2 is connected to the exhaust pipe body 13 through the cooperation of the internal thread 21 and the external thread 16. The other end of the series hose 2 is connected to the grout inlet 32 ​​of the adjacent grouting hole 3 to realize the series connection between the grouting holes 3. When grouting is injected into the grout inlet 32, the excess grout overflows from the exhaust port 31 and enters the next grout inlet 32 ​​through the exhaust pipe body 13 and the series hose 2.

[0046] Step 3: After the grout has initially set, remove the exhaust pipe 13 and the series hose 2.

[0047] Working principle: Insert the connecting pipe 33 into the leak-proof soft sleeve 111, and twist the rotating sleeve 115 to make it threadedly engage with the connecting piece 34. After the end of the rotating sleeve 115 contacts the locking block 351, the fixing buckle 35 deforms outward until the connecting piece 34 is fully screwed into the rotating sleeve 115. Then, the locking block 351 is driven by the fixing buckle 35 to lock into the slot 116. At this time, the exhaust pipe body 13 and the connecting pipe 33 are fully fitted and fixed with the leak-proof soft sleeve 111, realizing the connection between the exhaust pipe body 13 and the connecting pipe 33. The connection is as follows: one end of the series hose 2 is connected to the exhaust pipe body 13 through the engagement of the internal thread 21 and the external thread 16, and the other end of the series hose 2 is connected to the grout inlet 32 ​​of the adjacent grouting hole 3 to realize the series connection between the grouting holes 3. When grouting is injected into the grout inlet 32, the excess grout overflows from the exhaust port 31 and enters the next grout inlet 32 ​​through the exhaust pipe body 13 and the series hose 2. In this way, two or more grouting holes 3 are injected in succession to ensure the fullness and density of the grouting.

[0048] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0049] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A leak-proof device for tunnel grouting pipes, comprising a one-way vent pipe (1) and a series flexible hose (2), characterized in that, One end of the one-way exhaust pipe (1) is connected to the exhaust port (31) at the eccentric position of the grouting hole (3), one end of the series hose (2) is threadedly connected to the one-way exhaust pipe (1), and the other end of the series hose (2) is connected to the grout inlet (32) at the center position of the adjacent grouting hole (3). The one-way exhaust pipe (1) includes an anti-detachment connector (11), a filter element (12), an exhaust pipe body (13), a one-way valve (14), and a valve spring (15). The anti-detachment connector (11) is connected to one port of the exhaust pipe body (13). The filter element (12) is installed in the inner cavity of the exhaust pipe body (13) through the anti-detachment connector (11). The one-way valve (14) is located in the inner cavity of the exhaust pipe body (13) on the side away from the anti-detachment connector (11). The exhaust pipe body (13) has an external thread (16) at the end near the one-way valve (14). The valve spring (15) is installed between the one-way valve (14) and the external thread (16). The inner cavities at both ends of the series hose (2) are provided with internal threads (21), and the internal threads (21) and the external threads (16) are compatible. The exhaust port (31) is provided with a connecting pipe (33), and a connector (34) is provided on the outer peripheral surface of the connecting pipe (33). The outer peripheral surface of the connector (34) is provided with threads, and a fixing buckle (35) is symmetrically provided on the bottom surface of the connector (34). The fixing buckle (35) is in the shape of an "L" and a locking block (351) is provided on the fixing buckle (35). The filter element (12) includes a pressure ring (121), a connecting strip (122) and a filter screen (123). The pressure ring (121) is connected to the filter screen (123) through the connecting strip (122). There are four connecting strips (122) symmetrically provided. One end of the connecting strip (122) is fixedly connected to the inner side wall of the pressure ring (121), and the other end of the connecting strip (122) is fixedly connected to the bottom edge of the filter screen (123). The cross-section of the pressure ring (121) is the same as the cross-section of the exhaust pipe body (13). The diameter of the filter screen (123) is equal to the inner diameter of the exhaust pipe body (13). The pipe opening of the exhaust pipe body (13) overlaps with the pressure ring (121). The connecting strip (122) and the filter screen (123) are inserted into the inner cavity of the exhaust pipe body (13). The anti-detachment connector (11) includes a leak-proof soft sleeve (111), a soft sleeve outer fixing sleeve (112), a compression spring (113), a thrust bearing (114), and a rotating sleeve (115). The exhaust pipe body (13) is inserted into the rotating sleeve (115) and fixedly connected to the rotating sleeve (115). The inner wall of the rotating sleeve (115) near the opening is provided with threads. The rotating sleeve (115) is connected to the connector (34) through the threads. The outer wall of the rotating sleeve (115) is provided with a slot (116) that matches the locking block (351). A thrust bearing (114) is provided on the inner top surface of the rotating sleeve (115), and a compression spring (113) is fixed on the bottom surface of the thrust bearing (114). The bottom of the compression spring (113) abuts against the top of the soft outer fixing sleeve (112). The outer circumferential surface of the soft outer fixing sleeve (112) fits against the inner circumferential surface of the rotating sleeve (115). The soft outer fixing sleeve (112) is sleeved with the exhaust pipe body (13). A leak-proof soft sleeve (111) is nested inside the soft outer fixing sleeve (112). The inner wall of the leak-proof soft sleeve (111) fits against the exhaust pipe body. (13) and the outer wall of the connector (33) are fitted together. The inner wall of the leak-proof soft sleeve (111) is provided with an inner ring (111a) in the middle. The bottom surface of the leak-proof soft sleeve (111) is provided with a bottom ring (111b). The pipe opening of the exhaust pipe body (13) is abutted against the top surface of the inner ring (111a) through the pressure ring (121). The pipe opening of the connector (33) is inserted into the leak-proof soft sleeve (111) and abutted against the bottom surface of the inner ring (111a). The top surface of the bottom ring (111b) abuts against the outer fixing sleeve (112) of the soft sleeve. The bottom surface of the bottom ring (111b) abuts against the connector (34).

2. An operation method for a tunnel grouting pipeline leak-proof device, implemented based on the tunnel grouting pipeline leak-proof device according to claim 1, characterized in that, Includes the following steps: Step 1: Insert the connecting pipe (33) into the leak-proof soft sleeve (111), and turn the rotating sleeve (115) to make it threadedly engage with the connector (34). After the port of the rotating sleeve (115) contacts the locking block (351), the fixing buckle (35) will deform outward until the connector (34) is completely screwed into the rotating sleeve (115). Then the locking block (351) will be driven by the fixing buckle (35) and inserted into the slot (116). At this time, the exhaust pipe body (13) and the connecting pipe (33) are fully fitted and fixed with the leak-proof soft sleeve (111), realizing the connection of the exhaust pipe body (13) and the connecting pipe (33). Step 2: One end of the series hose (2) is connected to the exhaust pipe body (13) through the cooperation of the internal thread (21) and the external thread (16). The other end of the series hose (2) is connected to the grout inlet (32) of the adjacent grouting hole (3) to realize the series connection between the grouting holes (3). When grouting is performed into the grout inlet (32), the excess grout overflows from the exhaust port (31) and enters the next grout inlet (32) through the exhaust pipe body (13) and the series hose (2). Step 3: After the isobaric grout has initially set, remove the exhaust pipe (13) and the series hose (2).

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