WO2019228041A1

WO2019228041A1 - Grouting reinforcement method for ground drilling to coal seam broken roof, and grouting apparatus

Info

Publication number: WO2019228041A1
Application number: PCT/CN2019/080109
Authority: WO
Inventors: 袁安营; 袁安国; 张纯如; 王磊; 张晓玉
Original assignee: 安徽理工大学
Priority date: 2018-09-01
Filing date: 2019-03-28
Publication date: 2019-12-05
Also published as: CN108979590A; LU101599B1

Abstract

Provided are a grouting reinforcement method for ground drilling to a coal seam broken roof, and a grouting apparatus. The present invention is a method for grouting reinforcement when drilling from the ground to a broken roof. The operating space is large, specialised hole sealing is not required, the technical difficulty of drill hole grouting is reduced, and the defects of large drill hole angle limitations, small grouting ranges, high hole sealing difficulty, easy outflow of slurry and poor grouting effects in existing underground grouting are overcome. Drill hole density, depth and diameter are arranged according to coal seam broken roof and ground conditions, and sequential drilling is performed. A suitable grouting material is selected, and the grouting apparatus is used to perform grouting. The grouting apparatus uses a metering pump to draw in raw materials, the raw materials are accurately proportioned, a pressure gauge and a flow meter are set, and the grouting pressure and flow are stable and controllable. The slurry diffusion area is large, the grouting effect is good, and multi-hole grouting fully covers the broken roof, thereby significantly increasing the overall strength of extra thick and thick coal seam broken roofs.

Description

Grouting reinforcement method and grouting device for ground drilling to coal seam broken roof

Technical field

The invention belongs to the field of grouting and strengthening of broken roofs of coal seams, and relates to a method for preventing the impact of the fall of extra-thick broken roofs on the hydraulic support and coal wall of the working surface, in particular to a method of grouting from ground drilling to extra-thick broken roofs of coal seams. Method of reinforcement.

Background technique

There are thick direct roofs above some coal mines in China, and the roofs are easily broken. They are mainly characterized by large rock thickness, low rock strength, high fissure development, poor integrity, and low self-stabilizing ability, which lead to work during the mining process. Face roofs and roadway roofs appear to fall, coal triangles appear in the triangle area, roof leaks, roof fall, hydraulic support and other hidden dangers. The main factors that cause this phenomenon include the poor physical and mechanical properties of the roof rock layer, repeated disturbances in mining, and local structure.

The broken roof of the working face is allowed to be exposed for a short time and the exposed area is small. If it is not timely supported and controlled, a roof leakage accident will occur and the scope of roof leakage will become larger and larger. In order to prevent a broken roof accident, it is necessary to control in advance before a local roof leakage occurs.

In the past, methods such as strengthening geological exploration, strengthening construction management, advanced support, advanced support at the structure, and drilling grouting at the roadway were used to support and control the broken roof. However, the broken roof cannot be completely and effectively controlled. Especially when the working face has a thick frangible roof, the effect of drilling and grouting at the bottom of the well is average. First, the brittle roof has a large thickness and a large amount of work. Second, the borehole construction angle is limited and the hole is drilled. It is difficult to meet the design requirements, resulting in poor grouting effect. Finally, the drilling range of the underground roof is small, the sealing is difficult, the slurry is easy to flow out, and the grouting effect is poor.

Therefore, there is a need to provide an improved technical solution to the above-mentioned shortcomings of the prior art.

Summary of the Invention

The purpose of the present invention is to provide a method and a grouting device for grouting and reinforcement of ground drilling to broken roof of coal seam, so as to at least solve the current limitation of the drilling angle of the roof, the grouting range is small, the sealing is difficult, and the slurry is easy. Outflow, poor grouting, etc.

To achieve the above objective, the present invention provides the following technical solutions:

A method for grouting reinforcement from ground drilling to broken roof of coal seam, the method includes the following steps:

Step S1, sequentially drilling holes according to the roof of the working surface and the ground;

Step S2, selecting grouting materials, determining grouting parameters, and installing a grouting device;

In step S3, grouting is performed sequentially.

In the above-mentioned method for grouting reinforcement from ground drilling to broken roof of coal seam, preferably, step S1 specifically includes the following steps:

Step S11: Determine the density and arrangement of the drill holes and the diameter of the drill holes according to the broken condition of the roof of the working face;

Step S12: Determine the depth of each ground borehole according to the altitude and occurrence of the broken roof of the coal seam in the working face and the altitude of the ground borehole;

In step S13, drilling is performed in sequence according to the pushing direction of the working surface.

In the method for grouting and reinforcement of ground drilling to broken roof of coal seam as described above, preferably, step S2 specifically includes the following steps:

In step S21, the liquid polymer resin material of Ma Lisan is selected as the grouting material, wherein the A material and the B material are mixed in a volume ratio of 1: 1;

Step S22: Sampling and testing the slurry diffusion radius γ, the crack rate n and the effective filling coefficient β of the slurry in the cracks of the coal seam roof;

Step S23, determining the grouting pressure and the amount of grouting slurry;

The grouting pressure is partially different according to the lithology of the roof of different coal seams.

5MPa ～ 8MPa, the amount of grouting slurry is calculated according to the slurry diffusion radius γ and crack rate n.

Q = 2πγHnβ

In the formula: Q—the amount of slurry injected;

γ—slurry diffusion radius;

H—length of grouting section;

n—crack rate;

β-effective filling coefficient of the slurry in the fracture (the value of β ranges from 0.3 to 0.9);

Step S24: Install a grouting device to prepare grouting.

In the above-mentioned method for grouting and reinforcement of ground drilling to broken roof of coal seam, preferably, in the step S3, after the grouting of each hole is completed, the pipeline is immediately cleaned with lubricating oil to prevent mixed slurry Solidification in the pipeline.

As described above, a method for grouting and strengthening from ground drilling to a broken roof of a coal seam. Preferably, the grouting device in step S2 includes:

A storage tank for storing grouting slurry raw materials, the storage tank includes an A storage tank and a B storage tank;

Suction pipe, the suction pipe includes A suction pipe and B suction pipe, and the feeding ends of the A suction pipe and the B suction pipe are respectively connected with the discharge openings of the A storage tank and the B storage tank Communicating with each other, the discharge end of the A suction pipe and the B suction pipe are in communication with the feed end of the slurry mixing device;

Slurry mixing device, the slurry mixing device comprises a suction pump and a stirring device for sucking the slurry and stirring and mixing, the discharge end of the slurry mixing device is in communication with the feeding end of the mixing material conveying pipe ;

A mixing material conveying pipe whose output end is in communication with the input end of a high-pressure grouting pump;

A high-pressure grouting pump, wherein the output end of the high-pressure grouting pump is in communication with the feeding end of a high-pressure grouting pipe;

A high-pressure slurry conveying pipe, wherein a discharge end of the high-pressure slurry conveying pipe is in communication with a joint of a high-pressure slurry injection gun;

High-pressure slurry injection gun, the other end of the high-pressure slurry injection gun is conical closed, easy to put in deep holes, the barrel of the high-pressure slurry injection gun is cylindrical, and the wall of the high-pressure slurry injection gun is filled with injection Pulp holes.

In the above-mentioned grouting device for grouting and reinforcement of ground drilling to broken roof of coal seam, preferably, the slurry mixing device includes a suction pump which is divided into an A suction pump and a B suction pump. The A suction pump and the B suction pump are in communication with the discharge ends of the A suction pipe and the B suction pipe, respectively.

In the above-mentioned grouting device for grouting and strengthening from ground drilling to broken roof of coal seam, preferably, the A suction pump and the B suction pump are both metering pumps, which can accurately control the flow of the suction. It is convenient to control the volume ratio of the two kinds of slurry in the stirring device.

In the above-mentioned grouting device for grouting reinforced by ground drilling to broken roof of coal seam, preferably, the high-pressure grouting pipe is provided with a pressure gauge for observing grouting pressure and for observing grouting flow. Flowmeter. In the above-mentioned grouting device for grouting reinforcement by ground drilling to broken roof of coal seam, preferably, the high-pressure slurry injection gun includes a joint, a grouting cylinder, and a conical closed head, and the high-pressure slurry The size of the injection gun joint is unchanged, and there are multiple sets of specifications for the diameter, length, and density of the injection hole of the injection barrel.

In the above-mentioned grouting device for grouting and reinforcement of ground drilling to broken roof of coal seam, preferably, the outlets of the A suction pipe and the B suction pipe are respectively connected with A three-way valve and B three The inlet of the on-way valve is connected, and the outlets of the three-way valve and the three-way valve of B are connected to the input ends of the A and B suction pumps respectively; the three-way valve and the three The reversing ports of the through valve are respectively connected with the discharge ends of the A and B flush oil pipes; the feed ends of the A and B flush oil pipes are respectively connected with the discharge ports of the flush tank; the A The three-way valve and the three-way valve B are combined three-way valves.

Compared with the closest prior art, the technical solution provided by the present invention has the following excellent effects:

In the technical solution provided by the present invention, the mechanical properties of the weak surface of the rock layer of the broken roof are effectively improved after drilling through the ground to grout and strengthen the broken roof of the coal seam. Through sufficient grouting, the rock layer itself cracks and internal friction between layers The angle and cohesion are also significantly improved; compared with downhole drilling and grouting, ground drilling and grouting construction has a strong purpose, large operating space, convenient construction operation, and a large grouting diffusion area, which does not require special sealing. The technical difficulty of drilling and grouting is reduced, the grouting equipment is reasonably configured, the grouting slurry is evenly mixed, the pressure is stable and controllable, and the grouting effect is effectively improved, which greatly improves the overall strength of the broken roof of the coal seam and reduces a certain amount of Work load; it has a significant improvement effect on the reinforcement of the broken roof of extra-thick and thick coal seams.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which form a part of this application, are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and the descriptions thereof are used to explain the present invention, and do not constitute an improper limitation on the present invention. among them:

1 is a flowchart of a grouting method according to a specific embodiment of the present invention;

FIG. 2 is a specific flowchart of step S1 in FIG. 1;

FIG. 3 is a detailed diagram of step S2 in FIG. 1;

4 is a schematic structural diagram of a high-pressure grouting device according to a specific embodiment of the present invention;

5 is a schematic structural diagram of a high-pressure slurry injection gun according to a specific embodiment of the present invention;

6 is a schematic view of a coal seam top and bottom floor according to a specific embodiment of the present invention;

FIG. 7 is a schematic diagram of a ground drilling arrangement.

In the picture: 1. A storage tank; 2. B storage tank; 3. A suction tube; 4. B suction tube; 5. Slurry mixing device; 6. Mixing material conveying tube; 7. High pressure injection Slurry pump; 8, high-pressure slurry conveying pipe; 9, high-pressure slurry injection gun; 10, high-pressure slurry injection gun discharge hole; 11, ground drilling; 12, topsoil layer; 13, upper coal seam rock layer; 14, roof broken rock layer; 15, coal seam; 16, A flushing oil pipe; 17, B flushing oil pipe; 18, flushing tank.

Detailed ways

The present invention will be described in detail below with reference to the drawings and embodiments. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

In the description of the present invention, the terms "portrait", "landscape", "upper", "down", "front", "back", "left", "right", "vertical", "horizontal", " The azimuth or position relationship indicated by "top", "bottom", etc. is based on the azimuth or position relationship shown in the drawings, and is only for the convenience of describing the invention rather than requiring the invention to be constructed and operated in a specific orientation, so it cannot be understood as Restrictions on inventions. The terms “connected” and “connected” used in the present invention should be understood in a broad sense. For example, they may be fixed connections or detachable connections; they may be directly connected or indirectly connected through intermediate components. As for the skilled person, the specific meaning of the above terms can be understood according to the specific circumstances.

As shown in FIG. 1 to FIG. 7, a specific embodiment of the present invention provides a grouting method and a grouting device for ground drilling to coal seam broken roof grouting.

According to the embodiment of the present invention, as shown in FIG. 4, a grouting device for grouting and strengthening from ground drilling to a broken roof of a coal seam is provided. The grouting and strengthening device includes a storage tank, a suction pipe, a flushing oil pipe, and a flushing tank 18 5. Slurry mixing device 5. Mixing material conveying pipe 6. High-pressure grouting pump 7. High-pressure slurry conveying pipe 8. High-pressure slurry injection gun 9.

Storage tank, storage tank is used to store grouting slurry raw materials, storage tank includes A storage tank 1 and B storage tank 2; A storage tank 1 and B storage tank 2 are respectively used to hold this embodiment The grouting materials used are Ma Lisan A and Ma Lisan B.

Suction pipe, the suction pipe includes A suction pipe 3 and B suction pipe 4, the feeding ends of A suction pipe 3 and B suction pipe 4 are respectively connected with the output of A storage tank 1 and B storage tank 2 The feed ends are connected; the discharge ends of the A suction pipe 3 and the B suction pipe 4 are connected to the inlets of the A three-way valve and the B three-way valve, respectively; the reversing directions of the A three-way valve and the B three-way valve The ports are connected to the discharge ends of the A flushing oil pipe 16 and the B flushing oil pipe 17 respectively, and the feed ends of the A flushing oil pipe 16 and the B flushing oil pipe 17 are respectively connected to the discharge ports of the flushing tank 18; the A three-way valve and The outlet of the B three-way valve is connected with the inlet of the A suction pump and the B suction pump respectively; the two suction three-way valves can switch the suction material, so that the grouting and suction process and the flushing oil suction can be switched at any time.

Slurry mixing device 5, the slurry mixing device 5 includes a suction pump and a stirring device for sucking the slurry in proportion and fully stirring and mixing the slurry. The feeding end of the slurry mixing device 5 and the A suction pipe 3 and B The discharge end of the suction pipe 4 is connected, and the feed end of the slurry mixing device 5 is connected to the feed end of the mixture delivery pipe 6; the suction pump of the slurry mixing device 5 uses two identical models The metering pumps are A suction pump and B suction pump, respectively. The metering pump is not affected by the pressure in the mixing device, can accurately control the flow of the suction slurry, and facilitates the precise control of the volume ratio of the two types of slurry in the stirring device.

The mixing material conveying pipe 6 is connected to the output end of the mixing material conveying pipe 6 and the input end of the high-pressure grouting pump 7.

The high-pressure grouting pump 7 is connected to the output end of the high-pressure grouting pump 7 and the feed end of the high-pressure grouting pipe 8.

The high-pressure slurry conveying pipe 8 and the discharge end of the high-pressure slurry conveying pipe 8 are connected to the high-pressure slurry injection gun 9; in order to facilitate the observation of the grouting pressure and grout flow, a pressure gauge and a flow meter are provided on the high-pressure slurry conveying pipe.

High-pressure slurry injection gun 9, one end of high-pressure slurry injection gun 9 is in communication with the high-pressure slurry conveying pipe, and the other end of the high-pressure slurry injection gun 9 is conical closed, which is convenient for placing deep holes, and the barrel of the high-pressure slurry injection gun 9 is cylindrical Shape, high-pressure slurry injection gun 9 pipe wall is evenly distributed with grouting holes. The size of the joint of the high-pressure slurry injection gun 9 is unchanged, which is convenient for connecting the high-pressure slurry conveying pipe 8. In order to cope with different geological conditions and different drilling diameters, the diameter of the high-pressure slurry injection gun 9 is 120mm, 200mm, and 300mm. The length of the high-pressure slurry injection gun 9 is equal to the thickness of the broken top plate minus the slurry diffusion radius γ.

Wherein, the outer diameter of the barrel of the high-pressure injection gun is not smaller than the outer diameter of the high-pressure slurry conveying pipe 8.

According to the embodiment of the present invention, as shown in FIG. 1, FIG. 2 and FIG. 3, the present invention also provides a method for grouting and strengthening the broken roof of the ground borehole 11 to the coal seam 15. The grouting processing method includes the following steps:

S1, according to the roof of the working surface and the ground, drilling in sequence:

Sampling test the roof thickness of the 15 coal seam roof, the slurry diffusion radius γ, the crack rate n and the effective filling factor β of the slurry in the crack; determine the density and arrangement of the boreholes and the diameter of the boreholes according to the broken roof of the working face; drill The arrangement of the hole density is determined by the slurry diffusion radius γ, to ensure that the arranged drilling density can fully cover the broken roof of the coal seam 15 after the grouting, and the drilling diameters are available in three sizes of 120mm, 200mm, and 300mm. It is preferably 120mm; the relationship between the diameter of the high-pressure slurry injection gun 9 and the selection of the drilling diameter and the fracture rate n is shown in the following table 1:

Table 1.Relationship between the choice of high-pressure slurry injection gun diameter, bore diameter and crack rate n

The higher the crack rate n, the more the roof is broken. In this way, the holes are more likely to be damaged when drilling at the broken roof. Therefore, the larger the diameter of the hole is, the lower the crack rate n is, the lower the roof is. The better the stability of the surrounding rock, the more stable the drilling is. You can choose a common drilling size of 120mm.

The depth of each ground borehole 11 is determined according to the altitude and occurrence of the broken roof of the coal seam 15 at the working face and the height of the ground borehole 11; the bottom of the broken roof of the coal seam 15 at the working face and the ground borehole 11 are measured and calculated. The difference in altitude between the altitude and the difference minus the slurry diffusion radius γ at that location is the depth of the borehole at that location.

As shown in Figures 6 and 7, according to the advancing direction of the working surface, drilling is performed one by one in a row. The drill bit of the drilling equipment passes through the surface soil layer 12 and the upper coal layer 13 in order to reach the roof above the coal layer 15. The rock formation 14 is broken. When the drilling depth is reached, the drilling is stopped and the drilling tool is withdrawn, and a single drilling operation is completed.

Follow the same procedure to perform the next drilling in sequence.

S2, select grouting materials, determine grouting parameters, and install grouting devices

The liquid polymer resin material of Ma Lisan was selected as the grouting material, in which the A material and the B material were mixed in a volume ratio of 1: 1; in this embodiment, the A material is selected from the resin and the B material is selected from the catalyst. When the resin and the catalyst are mixed together, a reaction occurs to produce expansion, and a multi-element dense network elastic body is formed. When it is pushed by high pressure, it is injected into the gap of the broken roof (the closed crack of the coal rock layer can be opened under high pressure). Extend along the cracks in the broken top plate until all cracks (including cracks that are hard to detect with the naked eye and cracks that re-open under high pressure) are filled. In this embodiment, the selection of the A material and the B material is not sequential, and the A material may be a catalyst and the B material may be a resin.

Determine grouting pressure and grouting slurry volume Q;

The grouting pressure is partially different according to the lithology of the 15 roofs of different coal seams. The grouting pressure is selected from 5 to 8 MPa. The amount of grouting slurry Q is calculated based on the slurry diffusion radius γ and the fracture rate n.

Q = 2πγHnβ

In the formula: Q—the amount of slurry injected;

γ—slurry diffusion radius;

H—length of grouting section;

n—crack rate;

Prepare Ma Lisan material according to the amount of grouting and install a grouting device to prepare grouting.

S3, grouting in sequence:

First, select a high-pressure slurry injection gun 9 of appropriate size to connect with the high-pressure slurry conveying pipe 8 and put it into the hole to send it to the grouting position. Second, rotate the A three-way valve and B three-way valve to A suction. Pipe 3 and B suction pipe 4; again, adjust the A suction pump and the B suction pump so that their flows are the same, turn on the slurry mixing device 5 switch, suck the slurry and mix it to the high-pressure grouting pump 7; Turn on the high-pressure grouting pump 7 for grouting. During the grouting process, pay attention to the pressure of the pressure gauge on the high-pressure grouting pipe 8 and the flow rate of the flowmeter. When the flow rate is less than 5L / min, continue to grout for 10-20 minutes. When the pressure is stable at about 8MPa, stop the grouting and pull the injection gun out of the borehole. Finally, flush the grouting pipeline: After the grouting of this borehole is completed, immediately connect the A three-way valve and the B three-way valve. Connect to the A flushing oil pipe 16 and the B flushing oil pipe 17 so that the lubricating oil is sucked into the grouting pipeline through the flushing tank 18 and the pipeline is cleaned to prevent the mixed slurry from solidifying in the pipeline; Grouting of a hole.

In summary, the present invention also has the following beneficial technical effects:

In the technical solution provided by the present invention, after ground drilling to reinforce the broken roof of the coal seam by grouting, the mechanical characteristics of the weak surface of the broken roof rock layer are effectively improved, the overall strength is improved, and the rock layer itself has cracks and internal friction between layers. The angle and cohesion are also significantly improved; compared with downhole drilling and grouting, ground drilling and grouting construction has a strong purpose, large operating space, convenient construction operation, and a large grouting diffusion area, which does not require special sealing. The technical difficulty of drilling and grouting is reduced, the grouting equipment is reasonably configured, the grouting slurry ratio is accurate and uniform, the pressure is stable and controllable, and the grouting effect is effectively improved. Workload. It greatly improves the reinforcement effect of the broken roof of extra-thick and thick coal seams.

The above description 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 modifications and changes. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

A method for grouting reinforcement from ground drilling to broken roof of coal seam is characterized in that the grouting reinforcement method includes the following steps:

S1: Drill holes one by one according to the working roof and the ground;

S2, selecting grouting materials, determining grouting parameters, and installing a grouting device; the step S2 specifically includes the following steps:

S21, choose Ma Lisan liquid polymer resin material as the grouting material, in which material A and material B are mixed in a volume ratio of 1: 1;

S22. Sampling and testing the slurry diffusion radius γ, the fracture rate n, and the effective filling coefficient β of the slurry in the fracture of the coal seam roof;

S23. Determine the grouting pressure and the amount of grouting slurry;

The grouting pressure is partially different according to the lithology of the roof of different coal seams. The grouting pressure is selected in the range of 5 MPa to 8 MPa. The amount of grouting slurry Q is calculated based on the slurry diffusion radius γ and the fracture rate n. Q = 2πγHnβ

In the formula: Q—the amount of slurry injected;

γ—slurry diffusion radius;

H—length of grouting section;

n—crack rate;

β—the effective filling coefficient of the slurry in the fissure. The value of β ranges from 0.3 to 0.9;

S24. Install a grouting device to prepare grouting.

S3, grouting is performed sequentially.
The method for grouting reinforcement from ground drilling to broken roof of coal seam according to claim 1, wherein the step S1 comprises the following steps:

S11. Determine the density and arrangement of the drill holes and the diameter of the drill holes according to the broken roof of the working face;

S12. Determine the depth of each ground borehole according to the altitude and occurrence of the broken roof of the coal seam in the working face and the altitude of the ground borehole;

S13. According to the advancing direction of the working surface, drilling is performed in sequence according to the advancing direction of the working surface.
The method of grouting and strengthening from ground drilling to broken roof of coal seam according to claim 1, characterized in that in said step S3, after the grouting of each hole is finished, the pipeline is immediately cleaned with lubricating oil to avoid mixing. The slurry solidifies in the pipeline.
The grouting device used in the method for grouting and strengthening the ground drilled to the broken roof of a coal seam according to any one of claims 1 to 3, wherein the grouting device comprises:

A storage tank for storing grouting slurry raw materials, the storage tank includes an A storage tank and a B storage tank;

Suction pipe, the suction pipe includes A suction pipe and B suction pipe, the feeding ends of the A suction pipe and the B suction pipe are respectively the discharge ends of the A storage tank and the B storage tank Communication, the discharge ends of the A suction pipe and the B suction pipe are respectively communicated with the feed end of the slurry mixing device;

Slurry mixing device, the slurry mixing device comprises a suction pump and a stirring device for sucking the slurry and stirring and mixing, the discharge end of the slurry mixing device is in communication with the feeding end of the mixing material conveying pipe ;

A mixing material conveying pipe whose output end is in communication with the input end of a high-pressure grouting pump;

A high-pressure grouting pump, wherein the output end of the high-pressure grouting pump is in communication with the feeding end of a high-pressure grouting pipe;

A high-pressure slurry conveying pipe, the discharge end of the high-pressure slurry conveying pipe is in communication with the feed end of the high-pressure slurry injection gun;

High-pressure slurry injection gun, the injection end of the high-pressure slurry injection gun has a conical shape, which is convenient for placing deep holes, the barrel of the high-pressure slurry injection gun is cylindrical, and a liquid outlet hole is provided on the wall of the high-pressure slurry injection gun. .
The grouting device according to claim 4, wherein the suction pump comprises an A suction pump and a B suction pump, and the A suction pump and the B suction pump are respectively connected with the A suction pipe and the B suction pump. The discharge end of the suction pipe is connected.
The grouting device according to claim 5, wherein the A suction pump and the B suction pump are metering pumps, which can accurately control the flow rate of the suction material, and conveniently and accurately control the two types of slurry in the stirring device. The volume ratio of the material.
The grouting device according to claim 4, wherein the high-pressure slurry conveying pipe is further provided with a pressure gauge for observing grouting pressure and a flow meter for observing grouting flow.
The grouting device according to claim 4, wherein the high-pressure slurry injection gun comprises a joint, a grouting cylinder, and a conical closed head, and the diameter, length and grouting hole density of the grouting cylinder are provided with In multiple sets of specifications, the size of the high-pressure slurry injection gun joint remains unchanged, which is convenient for connection with the discharge end of the high-pressure slurry delivery pipe.
The grouting device according to claim 8, wherein the outer diameter of the barrel of the high-pressure slurry injection gun is not smaller than the outer diameter of the high-pressure slurry delivery pipe.
The grouting device according to claim 5, wherein the discharge ends of the A suction pipe and the B suction pipe are in communication with the feed ends of the A three-way valve and the B three-way valve, respectively, and The discharge ends of the three-way valve A and the three-way valve B are in communication with the input ends of the suction pump A and the suction valve B, respectively; the reversing ports of the three-way valve B and the three-way valve B are respectively connected to the flushing oil pipe A Connected to the discharge end of the B flush tubing; the feed ends of the A flush tubing and the B flush tubing are connected to the discharge port of the flush tank respectively; the three-way valve A and the three-way valve B are merged Three-way valve.