Slurry delivery device for improving the effect of surrounding rock grouting and working method thereof

Abstract

The application discloses a slurry delivery device for improving the grouting effect of surrounding rock and a working method thereof. The slurry delivery device is installed on the grouting end of a pipe shed steel pipe. The slurry delivery device comprises a plugging device and a conveying device. The plugging device comprises a pipe cap which is threadedly connected with the grouting end of the pipe shed steel pipe and a grouting guide pipe which is in communication with the pipe cap. The grouting guide pipe is threadedly connected with a slurry pumping pipe of a grouting device at an end extending out of the pipe cap. A switch valve is installed in the grouting guide pipe. The conveying device is installed in the grouting end of the pipe shed steel pipe. The conveying device comprises a slurry distribution valve and a plurality of guide pipes which are vertically connected with the slurry distribution valve and have different lengths. The slurry distribution valve comprises a slurry distribution plate which is connected with the guide pipes, an end portion gasket which is arranged in parallel with the slurry distribution plate, and support rods which are respectively connected with the slurry distribution plate and the end portion gasket at two ends. The end portion gasket is tightly attached to the end face of the grouting end of the pipe shed steel pipe. The slurry distribution plate is provided with slurry distribution holes in the plane. The guide pipes are fixed in the slurry distribution holes through screwing connection devices.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipe roof steel pipe grouting, and in particular to a slurry delivery device for improving grouting effect of surrounding rock and a working method thereof. BACKGROUND

[0002] For tunnel excavation construction of relatively weak surrounding rock, adopting pipe roof advanced support is one of effective measures to ensure safe tunnel excavation construction. In combination with grouting technology, grouting slurry is pressed into surrounding rock fissures through steel pipe wall holes, so that loose rock mass is cemented, thereby improving mechanical properties of weak (broken) surrounding rock and enhancing bearing capacity of surrounding rock, which can effectively inhibit surrounding rock loosening and collapse and achieve the purpose of reinforcing surrounding rock around pipe roof. When pressurized grouting is performed at the end of the pipe roof steel pipe exposed outside the surrounding rock, there is a difference in slurry pressure at the pipe wall holes at different positions on the steel pipe from the grouting end, which causes different diffusion pressures of surrounding slurry at different positions along the length direction of the steel pipe, and the reinforcement effect on the surrounding rock will also be different. In addition, after grouting of the pipe roof steel pipe is completed, the grouting end of the pipe roof steel pipe needs to be effectively plugged to prevent slurry backflow. Therefore, a slurry delivery device for improving grouting effect of surrounding rock and a working method thereof are needed. SUMMARY

[0003] The present application aims to provide a slurry delivery device for improving grouting effect of surrounding rock and a working method thereof according to the deficiencies of the prior art, by providing a plugging device and a conveying device on the grouting end of the pipe roof steel pipe, which can effectively improve the difference in grouting effect at different positions along the length of the pipe roof steel pipe axis and achieve effective plugging of the grouting end of the pipe roof steel pipe.

[0004] The present application is achieved by the following technical solutions:

[0005] A slurry delivery device for improving grouting effect of surrounding rock is characterized in that: the slurry delivery device is installed on the grouting end of a pipe roof steel pipe, and the slurry delivery device comprises a plugging device and a conveying device. The plugging device comprises a pipe cap threadedly connected with the grouting end of the pipe roof steel pipe and a grouting guide pipe in communication with the pipe cap. The grouting guide pipe is threadedly connected with a slurry pump delivery pipe of a grouting device at an end extending out of the pipe cap. A switch valve is installed in the grouting guide pipe.

[0006] The conveying device is installed in the grouting end of the pipe-roof steel pipe, and comprises a slurry distribution valve and several pipes with different lengths and vertically connected to the slurry distribution valve.

[0007] The switch valve is disc-shaped when in the closed state and has the same diameter as the inner diameter of the grouting pipe. The switch valve comprises several fixed edge surfaces arranged along the circumference thereof and connected to the inner wall of the grouting pipe and movable fan surfaces rotationally connected to the fixed edge surfaces through rotating shafts. Limiting rods are arranged between adjacent fixed edge surfaces, with one end of each limiting rod connected to the inner wall of the grouting pipe and the other end extending to the center of the switch valve. Both sides of each movable fan surface are provided with grooves facing the fluid input end of the grouting pipe. When the switch valve is in the closed state, adjacent movable fan surfaces are in close contact, and a limiting rod placement groove can be formed between the grooves of adjacent movable fan surfaces. The limiting rod is placed in the limiting rod placement groove. The shape, size and depth of the limiting rod placement groove meet the placement requirements of the limiting rod.

[0008] The limiting rod is a semi-cylindrical body, with the circular arc side of the limiting rod facing the fluid input end of the grouting pipe and the diameter surface being in contact with the limiting rod placement groove.

[0009] The side of the switch valve facing away from the fluid input end of the grouting pipe is provided with an elastic limiting device. The elastic limiting device comprises rigid constraint rings installed on the side of each movable fan surface facing away from the fluid input end of the grouting pipe and elastic limiting rings inserted into each rigid constraint ring. The rigid constraint rings are arranged in a ring shape.

[0010] The switch valve is disc-shaped when in the closed state and has the same diameter as the inner diameter of the grouting pipe. The switch valve comprises several fixed edge surfaces arranged along the circumference thereof and connected to the inner wall of the grouting pipe and movable fan surfaces rotationally connected to the fixed edge surfaces through rotating shafts. Limiting rods are arranged between adjacent fixed edge surfaces, with one end of each limiting rod connected to the inner wall of the grouting pipe and the other end extending to the center of the switch valve. Both sides of each movable fan surface are provided with grooves facing the fluid input end of the grouting pipe. When the switch valve is in the closed state, adjacent movable fan surfaces are in close contact, and a limiting rod placement groove can be formed between the grooves of adjacent movable fan surfaces. The limiting rod is placed in the limiting rod placement groove. The shape, size and depth of the limiting rod placement groove meet the placement requirements of the limiting rod.

[0011] The screwing connecting device comprises a support and a screwing device, the support comprises a control nut provided with an internal thread and a plurality of first supporting columns arranged circumferentially along the bottom of the control nut, the first supporting columns are fixedly connected around the slurry distribution hole of the slurry distribution plate, the screwing device comprises a control screw provided with an external thread, a pressing disc arranged in parallel with the control screw and a second supporting column connected with the control screw and the pressing disc at two ends respectively, the external thread of the control screw is matched with the internal thread of the control nut; when the screwing device is screwed in the support, the pressing disc moves towards the slurry distribution plate, the skirt of the pipe nozzle is tightly pressed between the pressing disc and the slurry distribution plate, so that the pipe is fixed.

[0012] The pipe shed steel pipes are lengthened through threaded connection, and a plurality of slurry injection holes are arranged circumferentially along the length direction of the pipe shed steel pipes.

[0013] The working method of the slurry distribution device for improving the effect of surrounding rock grouting comprises the following steps: connecting a pipe into a slurry distribution hole of a slurry distribution plate through a screwing connecting device to form a conveying device; inserting the conveying device into a grouting end of a pipe shed steel pipe and locating an end gasket of the conveying device on a grouting end surface of the pipe shed steel pipe; connecting a pipe cap of a plugging device with the grouting end of the pipe shed steel pipe and connecting a grouting pipe of the plugging device with a slurry pumping pipe of a grouting equipment to perform pressure grouting; after grouting is completed, sequentially removing the plugging device and the conveying device and cleaning, wherein the pipe on the conveying device is taken out of the pipe shed steel pipe or left in the pipe shed steel pipe.

[0014] The present application has the advantages of simple structure, convenient operation, effective improvement of the difference in grouting effect at different positions along the axial length of the pipe shed steel pipe, realization of uniform and controllable grouting effect, effective plugging of the grouting end of the pipe shed steel pipe through the switch valve arranged in the plugging device, reusability, facilitation of construction and saving of construction cost. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a schematic diagram of the pipe shed steel pipe of the present application;

[0016] Figure 2 It is a perspective view of the plugging device of the present application;

[0017] Figure 3 It is a schematic diagram of the closed state of the switch valve of the present application (I);

[0018] Figure 4 It is a schematic diagram of the open state of the switch valve of the present application (I);

[0019] Figure 5This is a schematic diagram (II) of the closed state of the switching valve of the present invention;

[0020] Figure 6 This is a schematic diagram (II) of the switch valve in the open state of the present invention;

[0021] Figure 7 This is a front view of the switch valve of the present invention in the closed state;

[0022] Figure 8 This is a reverse view of the valve in the closed state of the present invention;

[0023] Figure 9 This is a front view of the switch valve of the present invention in the open state;

[0024] Figure 10 This is a reverse view of the switch valve in the open state of the present invention;

[0025] Figure 11 This is a schematic diagram of the conveying device of the present invention;

[0026] Figure 12 This is a schematic diagram of the tightening connection device of the present invention;

[0027] Figure 13 This is a schematic diagram of the tightening device of the present invention;

[0028] Figure 14 This is a schematic diagram of the bracket of the present invention. Detailed Implementation

[0029] The features and other related features of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments, so as to facilitate understanding by those skilled in the art:

[0030] like Figures 1-14 As shown in the figure, markings 1-28 represent: 1. Movable fan surface; 2. Fixed side surface; 3. Limiting rod; 4. Guide cone; 5. Rotating shaft; 6. Rigid constraint ring; 7. Elastic limiting ring; 8. Pipe roof steel pipe; 9. Grout injection hole; 10. External thread of pipe roof steel pipe; 11. Pipe cap; 12. Grouting guide pipe; 13. External thread of grouting guide pipe; 14. Internal thread of pipe roof steel pipe; 15. Internal thread of pipe cap; 16. End washer; 17. Support rod; 18. Grout distribution plate; 19. Grout distribution hole; 20. Guide pipe; 21. Tightening connection device; 22. Control screw; 23. External thread of control screw; 24. Second support column; 25. Pressing disc; 26. Control nut; 27. First support column; 28. Internal thread of control nut.

[0031] Example: Figures 1-14As shown, the present embodiment relates to a slurry delivery device for improving the effect of surrounding rock grouting, which is installed on the grouting end of the pipe shed steel pipe 8. The slurry delivery device comprises a blocking device and a conveying device. The pipe shed steel pipe 8 is a commonly used steel pipe for tunnel advance support. The pipe shed steel pipe 8 is lengthened by threaded connection between pipes. Specifically, the pipe shed steel pipe 8 is provided with a pipe shed steel pipe outer thread 10 and a pipe shed steel pipe inner thread 14 at both ends, respectively. The pipe shed steel pipe outer thread 10 of one pipe shed steel pipe 8 cooperates with the pipe shed steel pipe inner thread 14 of another pipe shed steel pipe 8 to connect the two pipe shed steel pipes 8 together. The pipe shed steel pipe 8 is provided with a plurality of slurry injection holes 9 (arranged in a quincunx pattern) along the circumferential direction of the length of the pipe shed steel pipe 8. The grouting slurry can be injected into the surrounding rock fissures through the slurry injection holes 9, and a stable surrounding rock reinforcement ring can be formed around the pipe shed steel pipe 8 after the slurry is solidified.

[0032] As shown, Figures 2-6 The blocking device comprises a pipe cap 11 threaded connected with the grouting end of the pipe shed steel pipe 8 and a grouting guide pipe 12 in communication with the pipe cap 11. The pipe cap 4 is closed at one end and open at the other end, and is provided with a pipe cap inner thread 15 inside. The grouting guide pipe 12 is threaded connected with the slurry pumping pipe of the grouting equipment at the end extending out of the pipe cap 11, and is provided with an on-off valve inside. Specifically, the pipe cap inner thread 15 of the pipe cap 11 is adapted to the pipe shed steel pipe outer thread 10 of the pipe shed steel pipe 8, and the grouting guide pipe outer thread 13 of the grouting guide pipe 12 is adapted to the inner thread of the slurry pumping pipe of the grouting equipment.

[0033] As shown, Figures 7-10 The on-off valve is disc-shaped when in the closed state and has the same diameter as the inner diameter of the grouting guide pipe 12. The on-off valve comprises a plurality of fixed edge surfaces 2 arranged along the circumferential direction and connected with the inner wall of the grouting guide pipe 12, and a movable sector surface 1 rotatably connected with the fixed edge surfaces 2 through a rotating shaft 5. Limiting rods 3 are arranged between adjacent fixed edge surfaces 2, and one end of the limiting rod 3 is connected with the inner wall of the grouting guide pipe 12 and the other end extends to the center of the on-off valve. The two side edges of the movable sector surface 1 are provided with grooves, and the groove openings are directed to the fluid input end of the grouting guide pipe 12. When the on-off valve is in the closed state, the adjacent movable sector surfaces 1 are in close contact and the grooves between the adjacent movable sector surfaces 1 can form a limiting rod placing groove, and the limiting rod 3 is placed in the limiting rod placing groove. The limiting rod 3 can limit the movement of the movable sector surface 1 and prevent it from rotating towards the fluid input end of the grouting guide pipe 12. The shape, size and depth of the limiting rod placing groove meet the placement requirements of the limiting rod 3. In the present embodiment, the limiting rod 3 is a semi-cylindrical body, the circular arc side (semi-circular surface) of the limiting rod 3 is directed to the fluid input end of the grouting guide pipe 12, and the diameter surface (plane) is in contact with the limiting rod placing groove, i.e. the width of the groove of the side edge of the movable sector surface 1 is equal to the radius of the limiting rod 3. In addition, the contact surface between the limiting rod 3 and the groove of the movable sector surface 1 can be treated to prevent fluid from leaking out.

[0034] As shown in Figures 7-10 the reverse side (i.e. the output side, the side facing away from the fluid input end of the grouting conduit 12) of each movable sector 1 is provided with an elastic limiting device. The elastic limiting device comprises a rigid constraint ring 6 installed at the center of the reverse side (i.e. the output side, the side facing away from the fluid input end of the grouting conduit 12) of each movable sector 1 and an elastic limiting ring 7 inserted into each rigid constraint ring 6, and the plurality of rigid constraint rings 6 are arranged in a ring shape. When the front side (i.e. the input side, the side facing the fluid input end of the grouting conduit 12) of the movable sector 1 does not bear fluid pressure, i.e. the fluid input end of the grouting conduit 12 does not have pressure fluid input, the movable sector 1 is in a closed state due to the contraction of the elastic limiting ring 7, i.e. the switch valve is closed and seals the grouting conduit 12; when the fluid input end of the grouting conduit 12 is subjected to fluid pressurization, when the fluid pressure reaches a certain degree, the fluid pressure borne by the movable sector 1 exceeds the contraction tension of the elastic limiting ring 7, the movable sector 1 will rotate around the rotating shaft 5 under the action of the fluid pressure on the front side of the movable sector 1, the movable sectors 1 are no longer closed, and the fluid flows forward along the channel formed between the movable sectors 1.

[0035] In addition, when the fluid input end of the grouting conduit 12 inputs fluid with reduced pressure or stops fluid input, the fluid pressure borne by the movable sector 1 decreases or disappears, and the movable sector 1 will rotate around the rotating shaft 5 under the combined action of the contraction tension of the elastic limiting ring 7 on the reverse side of the movable sector 1 and the fluid pressure borne on the reverse side, and close; at the same time, due to the constraint of the limiting rod 3 on the rotation arc of the movable sector 1, even when the fluid input end of the grouting conduit 12 stops fluid input and the movable sector 1 bears a larger fluid pressure on the reverse side, the movable sector 1 will not rotate towards the fluid input end of the grouting conduit 12, i.e. the switch valve will not open in the reverse direction, and the fluid will not flow in the reverse direction.

[0036] As shown in Figures 7-10 the center of the switch valve is provided with a flow guide cone 4, and the flow guide cone 4 is connected to the end of the limiting rod 3 extending to the center of the switch valve, and the tip of the flow guide cone 4 points to the fluid input end of the grouting conduit 12, and functions as a flow guide.

[0037] As shown in Figure 11As shown, the conveying device comprises a slurry distribution valve and a plurality of conduits 20 of different lengths and vertically connected to the slurry distribution valve. The slurry distribution valve comprises a slurry distribution plate 18 connected to the conduits 20, an end gasket 16 arranged parallel to the slurry distribution plate 18, and support rods 17 connected to the slurry distribution plate 18 and the end gasket 16 at two ends respectively. The support rods 17 are arranged along the circumference of the slurry distribution plate 18 and the end gasket 16. The diameter of the slurry distribution plate 18 is adapted to the inner diameter of the pipe shed steel pipe 8. The outer diameter of the end gasket 16 is the same as the outer diameter of the end face of the grouting end of the pipe shed steel pipe 8, and the end gasket 16 is tightly attached to the end face of the grouting end of the pipe shed steel pipe 8. The end gasket 16 and the support rods 17 together ensure that the slurry distribution plate 18 does not tilt and can control that the slurry distribution plate 18 does not move. The slurry distribution plate 18 has slurry distribution holes 19 of different sizes, numbers and positions corresponding to the sizes, numbers and positions of the conduits 20 respectively. The conduits 20 are fixed in the slurry distribution holes 19 by screwing connection devices 21. The number of slurry distribution holes 19 is determined according to the actual demand for slurry distribution, i.e. according to the requirement for uniformity of surrounding rock grouting. Each slurry distribution hole 19 is connected to a conduit 20. The lengths of different conduits 20 are different, and the distances of slurry conveying are different. The use of conduits 20 of different lengths can directly convey slurry to different depths of the pipe shed steel pipe 18, which can reduce the pressure loss of slurry in the conveying process, so that the slurry pressure at the slurry outlet end of each conduit 20 is similar, the diffusion ability of the slurry around the slurry outlet end is similar, and the grouting effect at different cross sections along the axial length direction of the pipe shed steel pipe 8 is uniformly distributed.

[0038] As shown in Figures 12-14 The screwing connection device 21 comprises a support and a screwing device. The support comprises a control nut 26 provided with a control nut inner thread 28 and a plurality of first support columns 27 arranged along the circumference of the bottom of the control nut 26. The first support columns 27 are fixedly connected around the slurry distribution holes 19 of the slurry distribution plate 18. The screwing device comprises a control screw 22 provided with a control screw outer thread 23, a pressing disc 25 arranged parallel to the control screw 22, and a second support column 24 connected to the control screw 22 and the pressing disc 25 at two ends respectively. The control screw outer thread 23 of the control screw 22 is adapted to the control nut inner thread 28 of the control nut 26. Specifically, the control screw 22 is hollow inside. The nut at one end of the control screw 22 is a regular polygon, which provides a screwing force. The rest is a barrel shape, and the outer side is provided with the control screw outer thread 23. When the screwing device is screwed in the support, the pressing disc 25 moves towards the slurry distribution plate 18, tightly extruding the skirt of the conduit 20 between the pressing disc 25 and the slurry distribution plate 18, thereby fixing the conduit 20. When it is needed to loosen the constraint of the conduit 20, the screwing device is rotated in the opposite direction, so that the pressing disc 25 moves away from the slurry distribution plate 18, and no longer extrudes the skirt of the conduit 20.

[0039] Generally, during the conveying process of the grouting slurry from the one end (grouting end) of the pipe-roof steel pipe 8 exposed outside the surrounding rock to the other end (rock-entering end) deep into the surrounding rock, the grouting slurry is continuously injected into the surrounding rock fissures at a certain pressure from the grouting injection holes 9; as the grouting slurry pressure at the grouting end is continuously dissipated by the grouting injection holes 9 near the grouting end, the grouting slurry pressure at the grouting injection holes 9 far from the grouting end gradually decreases, resulting in a decrease in the diffusion of the grouting slurry in the surrounding rock fissures at the grouting injection holes 9 and a poor surrounding rock reinforcement effect. In the embodiment, the conveying device is installed in the pipe-roof steel pipe 8, and the grouting end of the pipe-roof steel pipe 8 is subjected to pressure grouting, so as to directly convey the grouting slurry to different positions (diffusion end) of the pipe-roof steel pipe 8 from the grouting end, and then the grouting slurry flows through the inner cavity of the pipe-roof steel pipe 8 and is injected into the surrounding rock fissures through the grouting injection holes 9 in the flow range thereof. Since the grouting slurry is not subjected to the pressure division of the grouting injection holes 9 during the conveying process from the grouting end to the diffusion end, it can be considered that the grouting slurry pressures at the diffusion ends are approximately the same, i.e., the grouting slurry pressures at the grouting injection holes 9 in the control range of each diffusion end are similar, so as to achieve a similar surrounding rock grouting diffusion effect in the control range of each diffusion end (under the condition that the surrounding rock lithology is consistent).

[0040] As shown in Figures 1-14 , the embodiment also has the following working method:

[0041] 1. The guide pipe 20 is connected to the grouting hole 19 of the grouting plate 18 by screwing the connecting device, so as to form the conveying device; the conveying device is inserted into the grouting end of the pipe-roof steel pipe 8, and the end gasket 16 of the conveying device is located on the grouting end surface of the pipe-roof steel pipe 8; the pipe cap 11 of the plugging device is connected to the grouting end of the pipe-roof steel pipe 8 (at this time, the inner plane of the pipe cap 11 is in close contact with the end gasket 16), and the grouting guide pipe 12 of the plugging device is connected to the slurry pumping pipe of the grouting equipment, so as to perform pressure grouting.

[0042] 2. After grouting is completed, the plugging device and the conveying device are sequentially removed and cleaned, wherein, according to the actual construction requirements, the guide pipe 20 on the conveying device can be taken out of the pipe-roof steel pipe 8 or left in the pipe-roof steel pipe 8.

[0043] The embodiment has the beneficial technical effects of simple structure and convenient operation; can effectively improve the difference in grouting effect at different positions along the axial length range of the pipe-roof steel pipe, so as to achieve a uniform and controllable grouting effect; by setting the on-off valve in the plugging device, the grouting end of the pipe-roof steel pipe is effectively plugged; and the device can be repeatedly used, which can not only facilitate construction, but also save construction cost.

[0044] Although the above embodiments have been described with reference to the accompanying drawings, it is to be understood that the present application is not limited to the embodiments disclosed herein, but that various modifications and changes can be made thereto without departing from the scope of the application as set forth in the claims.

Claims

1. A slurry delivery device for improving the effect of grouting of surrounding rock, characterized in that: The slurry delivery device is installed on the grouting end of the pipe roof steel pipe, and comprises a blocking device and a conveying device. The conveying device is installed in the grouting end of the pipe roof steel pipe, and comprises a slurry distribution valve and a plurality of pipes of different lengths and vertically connected to the slurry distribution valve. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe.

2. The slurry delivery device for improving the effect of surrounding rock grouting according to claim 1, characterized in that: The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe.

3. The slurry delivery device for improving the effect of surrounding rock grouting according to claim 1, characterized in that: The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is disc-shaped when in the closed state, and its diameter is the same as the inner diameter of the grouting pipe. The on-off valve is 4. The slurry delivery device for improving the effect of surrounding rock grouting according to claim 1, characterized in that: The screwing connecting device comprises a support and a screwing device, the support comprises a control nut provided with an internal thread and a plurality of first support columns arranged circumferentially along the bottom of the control nut, the first support columns are fixedly connected around the slurry distribution holes of the slurry distribution plate, the screwing device comprises a control screw provided with an external thread, a pressing disc arranged in parallel with the control screw, and a second support column connected with the control screw and the pressing disc at two ends respectively, the external thread of the control screw is matched with the internal thread of the control nut; when the screwing device is screwed in the support, the pressing disc moves towards the slurry distribution plate, tightly extruding the skirt of the pipe nozzle between the pressing disc and the slurry distribution plate, so as to fix the pipe.

5. The slurry delivery device for improving the effect of surrounding rock grouting according to claim 1, characterized in that: The pipe shed steel pipes are lengthened by threaded connection, and a plurality of slurry injection holes are arranged circumferentially along the length direction of the pipe shed steel pipes.

6. The method of claim 1-5, wherein the slurry delivery device is used to improve the effect of grouting surrounding rock. The working method comprises the following steps: connecting the pipe into the slurry distribution holes of the slurry distribution plate by the screwing connecting device to form a conveying device; inserting the conveying device into the grouting end of the pipe shed steel pipe and arranging the end gasket of the conveying device on the grouting end surface of the pipe shed steel pipe; connecting the pipe cap of the plugging device with the grouting end of the pipe shed steel pipe and connecting the grouting pipe of the plugging device with the slurry pumping pipe of the grouting equipment to carry out pressure grouting; after grouting is completed, the plugging device and the conveying device are sequentially taken down and cleaned, wherein the pipe on the conveying device is taken out of the pipe shed steel pipe or left in the pipe shed steel pipe.

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