Tunnel locking anchor pipe quick grouting joint, grouting assembly and quick grouting construction method

Abstract

The present invention provides a tunnel locking foot anchor pipe quick grouting joint, a grouting assembly and a quick grouting construction method. The grouting joint comprises a joint shell, an annular connecting channel, a slurry flow channel and a locking piece. The joint shell comprises an outer plate of the shell and a connecting part. The slurry flow channel is arranged in the outer plate of the shell, and the annular connecting channel is formed between the slurry flow channel and the outer plate of the shell. A first opening is provided on the annular connecting channel, and a second opening is provided on the slurry flow channel. The first opening and the second opening are arranged on the same side of the joint shell. A slurry inlet channel is provided in the connecting part, and the slurry inlet channel is connected with the slurry flow channel. The locking piece drives the outer plate of the shell to bend and deform inwardly. In the grouting assembly, a grouting connecting pipe with multiple connecting ends is connected to a grouting machine and grouting joints and grouting gate valves on two locking foot anchor pipes. By adopting the above structure, the step of welding a connecting rod at the tail end of the locking foot anchor pipe is eliminated. One grouting machine grouts two locking foot anchor pipes at the same time, effectively improving work efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel construction, and in particular to a tunnel locking anchor pipe quick grouting joint, a grouting component and a quick grouting construction method. Background Art

[0002] In tunnel construction, the term "locking foot" is a common technical measure in the industry, and is widely used in the construction of earth and broken rock tunnels. Locking foot mainly refers to the process of fixing the foot of the steel arch frame after the upper step excavation is completed and the steel arch frame is erected before the lower step excavation when the tunnel is excavated by the step method. Figure 1 The main process of locking the foot is to drive the locking foot anchor pipe 01 vertically into the surrounding rock wall 02, grouting the anchor pipe 01, and limiting the displacement of the steel arch frame 03 as much as possible, so that it can bear the pressure caused by the deformation of the surrounding rock 01 as soon as possible, and ensure the stability of the initial support of the tunnel.

[0003] After the installation of the steel arch frame 03 of the initial support is completed, if the locking foot construction is not carried out, the deformation of the surrounding rock 02 may cause the displacement convergence of the steel arch frame 03, which is not conducive to the exertion of the internal force of the support structure. After the installation of the locking foot anchor pipe 01, the self-stabilization time of the steel arch frame 03 can be increased, and the sinking caused by the initial support hanging in the air due to the lower step or invert excavation can be reduced.

[0004] At present, the construction units in the industry can ensure that the construction of the lock-foot anchor pipe is carried out in a timely manner according to the requirements, but there is a lag in the grouting of the lock-foot anchor pipe. This is mainly due to the fact that before the grouting of the lock-foot anchor pipe, Figure 2 , a section of connecting joint 04 needs to be welded in advance at the tail of the locking foot anchor pipe 03. The connecting joint 04 is provided with threads. The threads on the connecting joint 04 are used to connect the internal threaded joint of the grouting gate valve 05 to complete the connection between the locking foot anchor pipe 01 and the grouting gate valve 05, so as to carry out the grouting of the locking foot anchor pipe 01. However, the separate welding of the connecting joint 04 leads to a long construction time for the overall locking foot anchor pipe process. At the same time, the process is to weld and grout the locking foot anchor pipes 01 one by one, which directly leads to a longer time for the overall initial support formula process, and the grouting lag will inevitably have a greater impact on the overall force of the initial support. Summary of the invention

[0005] The first object of the present invention is to provide a tunnel locking anchor pipe quick grouting joint for quickly performing locking anchor pipe grouting.

[0006] The second object of the present invention is to provide a tunnel locking anchor pipe grouting assembly for quickly performing locking anchor pipe grouting.

[0007] The third object of the present invention is to provide a method for rapid grouting of a tunnel locking anchor pipe for rapidly performing grouting of the locking anchor pipe.

[0008] In order to achieve the above-mentioned first purpose, the tunnel locking foot anchor pipe quick grouting joint provided by the present invention includes a joint shell, an annular connecting channel, a slurry flow channel and a locking piece. The joint shell includes an outer plate of the shell and a connecting part. The outer plate of the shell is annular. The slurry flow channel is arranged in the outer plate of the shell. The slurry flow channel extends axially along the outer plate of the shell. The annular connecting channel is formed between the slurry flow channel and the outer plate of the shell. The annular connecting channel is sleeved outside the slurry flow channel along the circumferential direction of the slurry flow channel; a first opening is arranged on the annular connecting channel, and the first opening extends axially along the annular connecting channel; a second opening is arranged on the slurry flow channel, and the second opening extends axially along the slurry flow channel. The first opening and the second opening are arranged on a first side of the joint shell, and the connecting part is arranged on the second side of the joint shell, and the first side and the second side are different sides of the joint shell. A slurry inlet channel is arranged in the connecting part, and the slurry inlet channel is connected to the slurry flow channel; the locking piece is arranged on the outer wall of the joint shell, and the locking piece drives the outer plate of the shell to bend and deform toward the annular connecting channel.

[0009] It can be seen from the above scheme that the grouting joint is used to be installed at the tail end of the locking foot anchor pipe. When the grouting joint is installed at the tail end of the locking foot anchor pipe, the tail end of the locking foot anchor pipe is located in the annular connecting channel, and the outer plate of the shell is driven to bend and deform toward the annular connecting channel through the locking piece, so as to clamp the locking foot anchor pipe in the annular connecting channel. Since the slurry flow channel is arranged in the annular connecting channel, the slurry flow channel is connected with the locking foot anchor pipe, and the connecting part of the grouting joint is connected to the grouting machine. The grouting concrete enters the slurry flow channel from the slurry entry channel and then flows into the locking foot anchor pipe. After the grouting of the locking foot anchor pipe is completed, the grouting joint is removed from the tail end of the locking foot anchor pipe by removing the locking piece; the grouting of the locking foot anchor pipe is carried out through the grouting joint, and the step of welding the connecting rod at the tail end of the locking foot anchor pipe is eliminated. The installation and disassembly steps of the grouting joint are simple and quick, which effectively improves the work efficiency, and the grouting joint can be recycled and reused, which effectively saves costs.

[0010] A further solution is that the locking piece includes a hoop clamp and a bolt, the hoop clamp includes a hoop and two protruding blocks, a notch is provided between the first end and the second end of the hoop along the circumferential direction of the hoop, the two protruding blocks are protruded based on the outer side wall of the hoop, the notch is provided between the two protruding blocks, screw holes are respectively provided in the two protruding blocks, and the screw holes of the two protruding blocks are connected to the bolts.

[0011] It can be seen that the hoop is sleeved on the outside of the outer plate of the shell, and the bolts penetrate the screw holes in the two raised blocks at the same time. As the bolts are tightened, the outer plate of the shell gradually begins to deform, thereby fixing the locking foot anchor pipe in the annular connecting channel, completing the connection between the grouting joint and the locking foot anchor pipe; after the grouting is completed, the hoop is detached from the outer plate of the shell by loosening the bolts, so that the grouting joint on the tail end of the locking foot anchor pipe can be easily pulled out, and the grouting joint can be quickly installed and disassembled through the hoop and bolt connection structure.

[0012] A further solution is that at least one deformation channel is provided in the outer plate of the shell, the deformation channel extends along the axial direction of the outer plate of the shell, and the width of the deformation channel is smaller than the thickness of the outer plate of the shell.

[0013] It can be seen that the setting of the deformation channel allows the outer plate of the shell to have a larger deformation range, making it easier to lock the locking foot anchor pipe in the annular connecting channel, thereby making the connection between the locking foot anchor pipe and the grouting joint more stable.

[0014] A further solution is that the grouting joint includes a piston sleeve, which is arranged in the slurry flow channel, and the radial width of the piston sleeve is smaller than the radial width of the slurry flow channel; the piston sleeve is provided with a first active chamber, a slurry inlet and a plurality of slurry outlets, and the plurality of slurry outlets are arranged along the circumference of the piston sleeve, the first active chamber is connected with the plurality of slurry outlets, the slurry inlet is connected with the first active chamber, the slurry inlet is connected with the plurality of slurry outlets, and the slurry inlet is arranged in the slurry inlet channel; a first piston is provided in the first active chamber, and the first piston reciprocates axially in the first active chamber along the slurry flow channel, and the first piston can cover the plurality of slurry outlets.

[0015] It can be seen that in order to cooperate with the intermittent grouting mode of the grouting machine itself, a piston sleeve is arranged in the slurry flow channel, and the first piston in the piston sleeve performs reciprocating motion. During this period, the first piston intermittently covers multiple slurry outlets at the same time, so that it can discharge slurry intermittently, realize the intermittent pumping mode of the grouting joint, realize the constant pressure during the grouting process, and make the grouting process more stable.

[0016] A further solution is that a second active chamber is arranged in the piston sleeve, a connecting channel is arranged between the first active chamber and the second active chamber, and the first active chamber, the connecting channel and the second active chamber are arranged in sequence along the axial direction of the piston sleeve. The first active chamber is arranged close to the slurry entry channel, and the radial width of the connecting channel is smaller than the width of the first active chamber and the width of the second active chamber, respectively. A second piston is arranged in the second active chamber, and a piston rod is connected between the first piston and the second piston, the piston rod is arranged in the connecting channel, and the second piston moves in the second active chamber.

[0017] It can be seen that a second piston is arranged in the piston sleeve, and the first piston and the second piston are respectively connected to the piston rod, and the movable range of the first piston is limited by the setting structure of the second active chamber and the second piston, so that the first piston can accurately cover the slurry outlet while ensuring that the slurry outlet can discharge slurry smoothly after the first piston moves away from the slurry outlet.

[0018] A further solution is that a sealing ring is provided in the piston sleeve, the sealing ring is provided between the slurry inlet and the slurry outlet, a through hole is provided on the sealing ring, a sealing block is provided on the side wall of the first piston facing the slurry inlet, the sealing block passes through the through hole, and the sealing block and the through hole gap are matched.

[0019] It can be seen that a sealing ring is added in the piston sleeve, and the sealing block on the first piston cooperates with the through hole gap on the sealing ring to ensure the sealing of the concrete slurry flow in the piston sleeve and better ensure the constant pressure during the grouting process.

[0020] To achieve the above-mentioned second purpose, the tunnel locking anchor pipe rapid grouting assembly provided by the present invention includes a grouting connecting pipe, a grouting joint and at least two grouting gate valves. The grouting joint is the above-mentioned grouting joint, and one grouting joint is correspondingly connected to one grouting gate valve. The grouting connecting pipe is provided with a first connecting end, a second connecting end and a third connecting end. The first connecting end and the second connecting end are respectively connected to a grouting gate valve, and the third connecting end is used to connect a grouting machine.

[0021] It can be seen that the two locking foot anchor pipes are respectively connected to a grouting joint, and one grouting joint is correspondingly connected to a grouting gate valve. The two grouting gate valves are respectively connected to different connecting ends on a grouting connecting pipe, and the grouting connecting pipe is connected to a grouting machine, so that one grouting machine can grout the two locking foot anchor pipes at the same time, further improving work efficiency.

[0022] A further solution is that a binding section is provided on the grouting connecting pipe, a plurality of avoidance grooves are provided on the binding section, and the plurality of avoidance grooves are arranged along the length direction of the binding section.

[0023] It can be seen that when other grouting hoses are connected to the grouting connecting pipe, the setting of multiple avoidance grooves makes the surface of the grouting connecting pipe uneven. When the grouting connecting pipe and the grouting hose are connected by iron wire or other strips, the iron wire or other strips are tied in the avoidance groove, making the grouting connecting pipe and the grouting hose more stable.

[0024] To achieve the third objective, the present invention provides a tunnel anchor pipe rapid grouting construction method comprising the following steps:

[0025] Installation steps of locking foot anchor pipe:

[0026] Drill the locking foot anchor pipe into the leg of the steel arch frame of the initial support, and weld the locking foot anchor pipe to the steel arch frame;

[0027] Grouting steps:

[0028] The tail end of the locking foot anchor pipe is connected to a grouting joint through a locking piece. The grouting joint is the above-mentioned grouting joint. The grouting inlet channel of the grouting joint is connected to a grouting gate valve. The grouting gate valve is connected to a grouting machine to start grouting.

[0029] It can be seen that by grouting the locking foot anchor pipe through the grouting joint, the step of welding the connecting rod at the tail end of the locking foot anchor pipe is eliminated. The installation and disassembly steps of the grouting joint are simple and quick, which effectively improves the work efficiency of the overall anchor pipe construction, and the grouting joint can be recycled and reused, effectively saving costs.

[0030] To achieve the third objective, the present invention provides a tunnel anchor pipe rapid grouting construction method comprising the following steps:

[0031] Installation steps of locking foot anchor pipe:

[0032] Drill the locking foot anchor pipe into the leg of the steel arch frame of the initial support, and weld the locking foot anchor pipe to the steel arch frame;

[0033] Grouting assembly installation steps:

[0034] The grouting component is the above-mentioned grouting component;

[0035] A grouting joint is connected to the tail end of each of the two locking foot anchor pipes, a grouting gate valve is connected to each of the grouting joints, the grouting gate valves on the two locking foot anchor pipes are connected to a first connection end and a second connection end on a grouting connection pipe, respectively, and the third connection end on the grouting connection pipe is connected to a grouting machine;

[0036] Grouting steps:

[0037] Turn on the grouting machine and start grouting.

[0038] It can be seen that by connecting the grouting assembly between the two locking foot anchor pipes and the grouting machine, one grouting machine can grout the two locking foot anchor pipes at the same time, further improving the work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the installation of a locking foot anchor pipe in the background technology.

[0040] Figure 2 It is a schematic diagram of the connection between the locking foot anchor pipe and the grouting gate valve during grouting in the background technology.

[0041] Figure 3 It is a cross-sectional view of an embodiment of a tunnel locking anchor pipe quick grouting joint of the present invention.

[0042] Figure 4 It is a schematic diagram of the connection between the joint housing and the locking member in an embodiment of the tunnel locking anchor pipe quick grouting joint of the present invention.

[0043] Figure 5 is along Figure 4 Section view taken along line AA.

[0044] Figure 6It is a cross-sectional view of a piston sleeve in an embodiment of a tunnel locking anchor pipe quick grouting joint of the present invention.

[0045] Figure 7 is along Figure 6 Cross-sectional view taken along line BB.

[0046] Figure 8 It is a structural diagram of an embodiment of a tunnel locking anchor pipe rapid grouting assembly of the present invention.

[0047] Fig. 9 It is a schematic diagram of the connection between an embodiment of a tunnel locking foot anchor pipe quick grouting joint of the present invention and a locking foot anchor pipe.

[0048] The present invention is further described below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0049] The tunnel locking foot anchor pipe quick grouting joint of the present invention is used in the tunnel locking foot anchor pipe quick grouting process. After the locking foot anchor pipe is welded to the steel arch frame of the initial support, the grouting joint is connected to the tail end of the locking foot anchor pipe. There is no need to weld a connecting rod at the tail end of the locking foot anchor pipe, which effectively improves work efficiency. The grouting joint corresponds to a grouting gate valve, and the grouting gate valve is connected to a grouting machine through a grouting connecting pipe with three connecting ends, so that two locking foot anchor pipes correspond to two grouting joints, two grouting gate valves and one grouting machine, so that one grouting machine can grout two locking foot anchor pipes at the same time, further improving work efficiency.

[0050] See also Figure 3 The tunnel locking foot anchor pipe quick grouting joint 1 includes a joint shell 2, an annular connecting channel 3, a slurry flow channel 4, a piston sleeve 5 and a locking piece 6. The joint shell 2 is used to connect the grouting gate valve. When the tail end of the locking foot anchor pipe is connected to the grouting joint 1, the tail end of the locking foot anchor pipe is located in the annular connecting channel 3. The locking foot anchor pipe is connected to the slurry flow channel 4, and the grouting concrete flows from the slurry flow channel 4 to the locking foot anchor pipe to realize the grouting of the locking foot anchor pipe. The piston sleeve 5 is arranged in the slurry flow channel 4 to adapt to the intermittent pumping mode of the grouting machine itself. The locking piece 6 is used to lock and connect the tail end of the locking foot anchor pipe in the grouting joint 1 with the grouting joint 1.

[0051] See also Figure 4 The joint housing 2 includes a housing outer plate 21 and a connecting portion 22, and the connecting portion 22 is arranged on the side wall of the housing outer plate 21. In this embodiment, the connecting portion 22 is a connecting block protruding from the outer wall of the housing outer plate 21, and a thread 221 is arranged on the connecting portion 22, and the grouting gate valve is connected through the thread 221. A grouting channel 222 is arranged in the connecting portion 22, and the grouting concrete enters the grouting joint 1 from the grouting channel 222.

[0052] The outer plate 21 of the shell is annular, and the slurry channel 4 is arranged in the outer plate 21 of the shell. The slurry channel 4 extends along the axial direction of the outer plate 21 of the shell. The slurry channel 4 is connected with the locking foot anchor pipe, and the slurry inlet channel 222 is connected with the slurry channel 4. The central axis of the slurry channel 4 is parallel to or overlaps with the central axis of the outer plate 21 of the shell and the central axis of the slurry inlet channel 222, respectively. In this embodiment, the central axis of the slurry channel 4 overlaps with the central axis of the outer plate 21 of the shell and the central axis of the slurry inlet channel 222, respectively, and the central axis of the outer plate 21 of the shell overlaps with the central axis of the slurry inlet channel 222. Along the radial direction of the outer plate 21 of the shell, the width of the slurry channel 4 is greater than the width of the slurry inlet channel 222. When the piston sleeve 5 is installed in the slurry channel 4, there is still enough space in the slurry channel 4 to allow the concrete slurry to flow.

[0053] The annular connecting channel 3 is formed between the slurry flow channel 4 and the outer plate 21 of the shell, and the annular connecting channel 3 is sleeved outside the slurry flow channel 4 along the circumferential direction of the slurry flow channel 4. The annular connecting channel 3 is provided with a first opening 31, and the first opening 31 extends along the axial direction of the annular connecting channel 3. The slurry flow channel 4 is provided with a second opening 41, and the second opening 41 extends along the axial direction of the slurry flow channel 4. The first opening 31 and the second opening 41 are provided on the first side of the joint shell 2, and the connecting portion 22 is provided on the second side of the joint shell 2. The first side of the joint shell 2 and the second side of the joint shell 2 are different sides of the joint shell 2. In this embodiment, the first side of the joint shell 2 and the second side of the joint shell 2 are arranged back to back. When the grouting joint 1 is connected to the tail end of the locking foot anchor pipe, the locking foot anchor pipe passes through the first opening 31 and enters the annular connecting channel 3. At this time, the second opening 41 is located in the locking foot anchor pipe; and the connecting portion 22 is connected to the grouting gate valve. Since the first side of the joint shell 2 and the second side of the joint shell 2 are arranged back to back, concrete can flow along the axial direction of the slurry flow channel 4 and enter the locking foot anchor pipe through the second opening 41 to complete the grouting process of the locking foot anchor pipe.

[0054] A sealing ring 32 is provided on the inner wall of the annular connecting channel 3. The sealing ring 32 is arranged opposite to the first opening 31. The sealing ring 32 is in interference contact with the inner wall of the annular connecting channel 3 extending axially along the annular connecting channel 3. The setting of the sealing ring 32 ensures the sealing inside the annular connecting channel 3 during grouting.

[0055] The locking member 6 is arranged on the outer side wall of the joint housing 2, and the locking member 6 drives the housing outer plate 21 to bend and deform toward the annular connecting passage 3. There are various structures of the locking member 6, such as using a spring clamp to clamp the housing outer plate 21, or clamping the housing outer plate 21 by snapping two hinged clamping blocks, forcing the housing outer plate 21 to deform and clamp the tail end of the locking foot anchor pipe in the annular connecting passage 3.

[0056] In this embodiment, see Figure 5The locking member 6 includes a hoop clamp 61, a bolt 62 and a nut 63. The hoop clamp 61 includes a hoop 611 and two protruding blocks 612. A notch 613 is provided between the first end and the second end of the hoop 61 along the circumferential direction of the hoop 61. The two protruding blocks 612 are protruded based on the outer wall of the hoop 611. The notch 613 is provided between the two protruding blocks 612. Screw holes 614 are respectively provided in the two protruding blocks 612. The screw holes 614 of the two protruding blocks 612 are both connected to the bolt 62. The hoop 61 is sleeved on the outer side plate 21 of the shell, and the bolt 62 passes through the screw holes 614 in the two protruding blocks 612 at the same time and is connected to the nut 63. As the bolt 62 is tightened, the outer side plate 21 of the shell gradually begins to deform, thereby fixing the locking foot anchor pipe in the annular connection channel 3, completing the connection between the grouting joint 1 and the locking foot anchor pipe; after the grouting is completed, the hoop clamp 61 is detached from the outer side plate 21 of the shell by loosening the bolt, so that the grouting joint 1 on the tail end of the locking foot anchor pipe can be easily pulled out, and the grouting joint 1 can be quickly installed and removed through the connection structure of the hoop 611 and the bolt 62. The locking member 6 of this structure is used to connect the locking foot anchor pipe and the grouting joint 1. The locking member 6 is easy to obtain, and the tightness of the connection can be better controlled. It is easy to install and remove, and the work efficiency is effectively improved.

[0057] At least one deformation channel 211 is provided in the outer plate 21 of the shell. In the present embodiment, there are two deformation channels 211, which are arranged in a radial direction of the outer plate 21 of the shell and are arranged in a collinear manner. The deformation channel 211 extends in the axial direction of the outer plate 21 of the shell, and the width of the deformation channel 211 is less than the thickness of the outer plate 21 of the shell. The arrangement of the deformation channel 11 enables the outer plate 21 of the shell to have a larger deformation range, and it is easier to lock the locking foot anchor pipe in the annular connecting channel 3, so that the connection between the locking foot anchor pipe and the grouting joint 1 is more stable.

[0058] The piston sleeve 5 is arranged in the pulp flow channel 4, and the radial width of the piston sleeve 5 is smaller than the radial width of the pulp flow channel 4. In this embodiment, a thread 223 is arranged in the pulp inlet channel 222, and a thread 51 is arranged on the outer wall of the piston sleeve 5. When the piston sleeve 5 is installed in the pulp flow channel 4, one end of the piston sleeve 5 is inserted into the pulp inlet channel 222, and the thread 223 in the pulp inlet channel 222 is matched with the thread 51 of the piston sleeve 5 for connection. Figure 6 and Figure 7The piston sleeve 5 is provided with a slurry inlet 52, a first movable chamber 53, a plurality of slurry outlets 54, a second movable chamber 55, a first piston 56, a piston rod 57 and a second piston 58. Along the axial direction of the piston sleeve 5, the slurry inlet 52, the first movable chamber 53 and the second movable chamber 55 are arranged in sequence, and the slurry inlet 52 is arranged close to the connecting portion 22. A connecting passage 59 is provided between the first movable chamber 53 and the second movable chamber 55, and the connecting passage 59 extends along the axial direction of the piston sleeve 5. Along the radial direction of the piston sleeve 5, the width of the first movable chamber 53 is the same as that of the second movable chamber 55, and the width of the first movable chamber 53 is greater than the width of the connecting passage 59.

[0059] The slurry inlet 52 is connected to the first active chamber 53. Multiple slurry outlets 54 are arranged along the circumference of the piston sleeve 5, the first active chamber 53 is connected to the multiple slurry outlets 54, and the slurry inlet 52 is connected to the multiple slurry outlets 54; the slurry outlets 54 are correspondingly arranged outside the first active chamber 53. In this embodiment, four slurry outlets 54 are arranged at equal distances along the circumference of the piston sleeve 5. A sealing ring 531 is arranged in the first active chamber 53, and the sealing ring 531 is arranged between the slurry inlet 52 and the slurry outlet 54, and a through hole 5311 is arranged on the sealing ring 531.

[0060] In order to cooperate with the intermittent grouting mode of the grouting machine itself, the first piston 56 reciprocates along the axial direction of the piston sleeve 5 in the first movable chamber 53. During this period, the first piston 56 intermittently covers multiple slurry outlets 54 at the same time, so that it can intermittently discharge slurry, realize the intermittent pumping mode of the grouting joint 1, realize the constant pressure during the grouting process, and make the grouting process more stable. In this embodiment, a piston stop position 532 is provided in the first movable chamber 53, and the piston stop position 532 is arranged between the connecting channel 59 and the slurry outlet 54, and the slurry outlet 54 is arranged between the piston stop position 532 and the slurry inlet 52; during the normal slurry discharge process of the slurry flow channel 4, the first piston 56 stays in the piston stop position 532, so that the first piston 56 cannot cover the river outlet; when the slurry flow channel 4 stops discharging slurry, the first piston 56 moves toward the slurry outlet 54 and covers the slurry outlet 54, so that it cannot discharge slurry.

[0061] The first piston 56 and the second piston 58 are connected to the piston rod 57 respectively. In this embodiment, the second piston 58 is integrally connected with the axial second end of the piston rod 57, and the first piston 56 is threadedly connected with the piston rod 57. A connecting groove 561 is concave on the side wall of the first piston 56 facing the connecting passage 59, and a thread is arranged on the side wall of the connecting groove 561. A thread is arranged on the axial second end of the piston rod 57, and the axial second end of the piston rod 57 is connected to the first piston 56 through a threaded connection in the connecting groove 561. After the piston rod 57 passes through the connecting passage 59, the second piston 58 is located in the second active chamber 55, and then the piston rod 57 is connected to the first piston 56; the piston rod 57 can be matched with the side wall clearance of the connecting passage 59.

[0062] A sealing block 562 is provided on the side wall of the first piston 56 facing the slurry inlet 52. The sealing block 562 penetrates the through hole 5311 of the sealing ring 531, and the sealing block 562 and the through hole 5311 are in clearance. The sealing ring 531 is added in the piston sleeve 5, and the sealing block 562 on the first piston 56 is in clearance with the through hole 5311 on the sealing ring 531, so as to ensure the sealing of the concrete slurry flow in the piston sleeve 5, and better ensure the constant pressure during the grouting process.

[0063] See also Figure 8 The tunnel locking foot anchor pipe quick grouting assembly 7 includes a first grouting connection pipe 71, a second grouting connection pipe 72, a grouting hose 73, two grouting joints 1 and two grouting gate valves 05. The first grouting connection pipe 71 is provided with a first connection end 711, a second connection end 712 and a third connection end 713. The first connection end 711 and the second connection end 712 are respectively connected to a grouting gate valve 05, and the third connection end 713 is used to connect a grouting machine. In this embodiment, the second connection end 712 of the first grouting connection pipe 71 is connected to the second grouting connection pipe 72 through the grouting hose 73, and the second grouting connection pipe 72 is connected to the grouting gate valve 05. One grouting joint 1 is correspondingly connected to one grouting gate valve 05, and one grouting joint 1 is correspondingly connected to the tail end of one locking foot anchor pipe. The first grouting connection pipe 71 is provided with a plurality of connection ends, and different locking foot anchor pipes are correspondingly connected to the plurality of connection ends, so that one grouting machine can grout two locking foot anchor pipes at the same time, further improving work efficiency.

[0064] In this embodiment, a binding section 714 is provided on the first grouting connection pipe 71. In this embodiment, the third connection end 713 of the first grouting connection pipe 71 is located on the binding section 714. A plurality of avoidance grooves 715 are provided on the binding section 714, and the plurality of avoidance grooves 715 are arranged along the length direction of the binding section 714. When other grouting hoses are connected to the first grouting connection pipe 711, the setting of the plurality of avoidance grooves 715 makes the surface of the first grouting connection pipe 711 uneven. When the first grouting connection pipe 711 is connected to the grouting hose 73 by iron wire or other strips, the iron wire or other strips are bound in the avoidance grooves 715, so that the first grouting connection pipe 711 and the grouting hose 73 are more stable.

[0065] The tunnel locking anchor pipe rapid grouting construction method includes the following steps:

[0066] Installation steps of locking foot anchor pipe:

[0067] The initial support steel arch frame is installed and fixed according to the construction technical requirements. The locking foot anchor pipe is drilled at the foot of the steel arch frame using drilling equipment such as a manual pneumatic drill, a rock drilling rig or an anchor drilling rig. At this time, the drilling equipment is connected to the anchor pipe. The anchor pipe is installed in place while the drilling equipment is drilling. The anchor pipe is not installed after drilling. After the anchor pipe is installed in place, the locking foot anchor pipe is welded and fixed to the steel arch frame using L-shaped steel bars.

[0068] Grouting assembly installation steps:

[0069] A grouting joint 1 is connected to the tail end of each of the two locking foot anchor pipes, and the locking foot anchor pipe is located in the annular connecting channel 3 of the grouting joint 1. Then, the locking member 6 is used to clamp the locking foot anchor pipe and the grouting joint 1. A grouting gate valve 05 is connected to a grouting joint 1. The grouting gate valves 05 on the two locking foot anchor pipes are respectively connected to a first connecting end 711 and a second connecting end 712 on a first grouting connecting pipe 71, wherein one of the grouting gate valves 05 is connected to the second grouting connecting pipe 72, and the second grouting connecting pipe 72 is connected to the second connecting end 712 of the first grouting connecting pipe 71 through a grouting hose 73. The third connecting end 713 on the first grouting connecting pipe 71 is connected to a grouting machine, wherein another grouting hose is connected to the tying section 714 on the first grouting connecting pipe 71 by wire tying, and this grouting hose is connected to the grouting machine.

[0070] Grouting steps:

[0071] Turn on the grouting machine and start grouting. After the grouting is completed, close the grouting gate valve 05 and start disassembling the locking piece 6 about 2 to 3 minutes later, and remove the grouting joint 1 from the tail end of the locking foot anchor pipe to carry out grouting construction of the locking foot anchor pipe on the other side of the tunnel.

[0072] In this construction method, one grouting machine grouts two locking foot anchor pipes at the same time. If during the construction process, the construction personnel want to grout the locking foot anchor pipes one by one, the grouting joint 1 can be connected to the grouting gate valve 05, and the grouting gate valve 05 can be connected to the grouting machine through the grouting hose 73, so that one grouting machine can grout one locking foot anchor pipe.

[0073] The grouting joint 1 is used to install at the tail end of the locking foot anchor pipe, see Fig. 9 When the grouting joint 1 is installed at the tail end of the locking foot anchor pipe 01, the tail end of the locking foot anchor pipe 01 is located in the annular connecting channel 3, and the outer side plate 21 of the shell is driven to bend and deform toward the annular connecting channel 3 through the locking piece 6, so that the locking foot anchor pipe 01 in the annular connecting channel 3 is clamped. Since the slurry channel 4 is arranged in the annular connecting channel 3, the slurry channel 4 is connected to the locking foot anchor pipe 01, and the connecting part 22 of the grouting joint 1 is connected to the grouting machine. The grouting concrete enters the slurry channel 4 from the slurry inlet channel 222 and then flows into the locking foot anchor pipe 01. After the grouting of the locking foot anchor pipe 01 is completed, the grouting joint 1 is removed from the tail end of the locking foot anchor pipe 01 by removing the locking piece 6; the grouting of the locking foot anchor pipe 01 is performed through the grouting joint 1, and the step of welding the connecting rod at the tail end of the locking foot anchor pipe 01 is removed. The installation and disassembly steps of the grouting joint 1 are simple and quick, which effectively improves the work efficiency, and the grouting joint 1 can be recycled and reused, which effectively saves costs. The piston sleeve 5 is installed in the slurry flow channel 4, and the constant pressure and stability function during the grouting process is realized by the first piston 56 in the piston sleeve 5. The setting of multiple connection ends on the first grouting connecting pipe 71 in the grouting assembly effectively improves the construction efficiency, and at the same time ensures the grouting operation and quality control of the two locking foot anchor pipes 01. The grouting assembly is simple, fast, convenient and effective to operate during the construction process, and the sealing effect pin during the construction of the overall locking foot anchor pipe 01 completely solves the problems of cumbersome operation and poor sealing of traditional grouting, improves the grouting fullness, and solves the overall initial support force problem caused by low grouting efficiency.

[0074] Finally, it should be emphasized that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. Tunnel lock anchor pipe quick grouting joint, It is characterized in that include: A joint shell, an annular connecting channel, a slurry flow channel and a locking piece, wherein the joint shell comprises an outer shell plate and a connecting portion, the outer shell plate is annular, the slurry flow channel is arranged inside the outer shell plate, the slurry flow channel extends along the axial direction of the outer shell plate, the annular connecting channel is formed between the slurry flow channel and the outer shell plate, and the annular connecting channel is sleeved outside the slurry flow channel along the circumferential direction of the slurry flow channel; The annular connecting channel is provided with a first opening, the first opening extending along the axial direction of the annular connecting channel, the slurry flow channel is provided with a second opening, the second opening extending along the axial direction of the slurry flow channel, the first opening and the second opening are respectively provided on the first side of the joint shell, the connecting portion is provided on the second side of the joint shell, the first side and the second side are different sides of the joint shell, a slurry inlet channel is provided in the connecting portion, and the slurry inlet channel is communicated with the slurry flow channel; The locking member is arranged on the outer side wall of the joint housing, and the locking member drives the outer side plate of the housing to bend and deform toward the annular connecting channel; The grouting joint comprises a piston sleeve, the piston sleeve is arranged in the slurry flow channel, and the radial width of the piston sleeve is smaller than the radial width of the slurry flow channel; The piston sleeve is provided with a first movable chamber, a pulp inlet and a plurality of pulp outlets, the plurality of pulp outlets are arranged along the circumference of the piston sleeve, the first movable chamber is communicated with the plurality of pulp outlets, the pulp inlet is communicated with the first movable chamber, the pulp inlet is communicated with the plurality of pulp outlets, and the pulp inlet is arranged in the pulp inlet channel; A first piston is disposed in the first movable chamber. The first piston reciprocates along the axial direction of the slurry flow channel in the first movable chamber. The first piston can cover a plurality of slurry outlets.

2. The tunnel locking anchor pipe quick grouting joint according to claim 1, Features: The locking member includes a hoop clamp and a bolt, the hoop clamp includes a hoop and two protruding blocks, a notch is provided between the first end and the second end of the hoop along the circumferential direction of the hoop, the two protruding blocks are protruded based on the outer side wall of the hoop, the notch is provided between the two protruding blocks, screw holes are respectively provided in the two protruding blocks, and the screw holes of the two protruding blocks are connected to the bolts.

3. The tunnel locking anchor pipe quick grouting joint according to claim 1, Features: At least one deformation channel is arranged in the outer plate of the shell. The deformation channel extends along the axial direction of the outer plate of the shell. The width of the deformation channel is smaller than the thickness of the outer plate of the shell.

4. The tunnel locking anchor pipe quick grouting joint according to any one of claims 1 to 3, Features: A second active chamber is provided in the piston sleeve, a communication channel is provided between the first active chamber and the second active chamber, and along the axial direction of the piston sleeve, the first active chamber, the communication channel and the second active chamber are arranged in sequence, the first active chamber is arranged close to the slurry inlet channel, and the radial width of the communication channel is smaller than the width of the first active chamber and the width of the second active chamber respectively; A second piston is disposed in the second movable chamber, a piston rod is connected between the first piston and the second piston, the piston rod is disposed in the communicating passage, and the second piston moves in the second movable chamber.

5. The tunnel locking anchor pipe quick grouting joint according to any one of claims 1 to 3, Features: A sealing ring is arranged in the piston sleeve, and the sealing ring is arranged between the slurry inlet and the slurry outlet. A through hole is arranged on the sealing ring. A sealing block is arranged on the side wall of the first piston facing the slurry inlet, and the sealing block passes through the through hole. The sealing block and the through hole are gap-matched.

6. Tunnel lock anchor pipe rapid grouting assembly, It is characterized in that include: A grouting connecting pipe, a grouting joint and at least two grouting gate valves, wherein the grouting joint is the grouting joint according to any one of claims 1 to 5, one of the grouting joints is correspondingly connected to one of the grouting gate valves, and the grouting connecting pipe is provided with a first connecting end, a second connecting end and a third connecting end, the first connecting end and the second connecting end are respectively connected to one of the grouting gate valves, and the third connecting end is used to connect a grouting machine.

7. The tunnel locking anchor pipe rapid grouting assembly according to claim 6, Features: The grouting connecting pipe is provided with a binding section, and the binding section is provided with a plurality of avoidance grooves, and the plurality of avoidance grooves are arranged along the length direction of the binding section.

8. Tunnel lock anchor pipe rapid grouting construction method, It is characterized in that The following steps are involved: Installation steps of locking foot anchor pipe: Drilling a locking foot anchor pipe into the leg of the steel arch frame of the initial support, and welding and fixing the locking foot anchor pipe to the steel arch frame; Grouting steps: A grouting joint is connected to the tail end of the locking foot anchor pipe through a locking piece. The grouting joint is the grouting joint according to any one of claims 1 to 5. The grouting inlet channel of the grouting joint is connected to a grouting gate valve, and the grouting gate valve is connected to a grouting machine to start grouting.

9. Tunnel lock anchor pipe rapid grouting construction method, It is characterized in that The following steps are involved: Installation steps of locking foot anchor pipe: Drilling a locking foot anchor pipe into the leg of the steel arch frame of the initial support, and welding and fixing the locking foot anchor pipe to the steel arch frame; Grouting assembly installation steps: The grouting assembly is the grouting assembly according to claim 6 or 7; A grouting joint is connected to the tail end of each of the two locking foot anchor pipes, a grouting gate valve is connected to one of the grouting joints, the grouting gate valves on the two locking foot anchor pipes are connected to the first connection end and the second connection end of each of the grouting connecting pipes, and the third connection end of the grouting connecting pipe is connected to a grouting machine; Grouting steps: The grouting machine is turned on and grouting begins.

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