Grouting pipeline and method for broken area of surrounding rock

Abstract

The invention belongs to the technical field of mine grouting, and particularly relates to a surrounding rock crushing area grouting pipeline and method.The surrounding rock crushing area grouting pipeline comprises a grout outlet pressure storage pipe and a pressure-bearing grout outlet pipe, and the grout outlet pressure storage pipe is arranged in the pressure-bearing grout outlet pipe in a sleeved mode. The embedded design of the grout outlet pressure storage pipe and the pressure-bearing grout outlet pipe is innovatively adopted, in the pressure storage stage, the whole grout outlet pressure storage pipe is filled with grout, it is ensured that pressure is evenly distributed, and when the grout outlet pressure storage pipe is rotated to enable grout outlet holes in a common pressure storage pipe and an end head pressure storage pipe to coincide with grout outlet holes in the corresponding positions of the pressure-bearing grout outlet pipe, the grout outlet pressure storage pipe and the pressure-bearing grout outlet pipe coincide. Slurry can be evenly injected within the length range of the whole grouting hole, the problem that the diffusion range of deep slurry is limited is effectively solved, the grouting effect is remarkably improved, and the safety and reliability of production of a surrounding rock broken area are enhanced.

Description

Technical Field

[0001] The present invention belongs to the technical field of mine grouting, and particularly relates to a grouting pipeline and method for a surrounding rock broken area. Background Art

[0002] Coal mining in China has a long history. During the several-year mining process of underground coal mines, a large number of surrounding rock broken areas have been formed. Since the underground coal mining in mines generally adopts the mining sequence of from easy to difficult, from near to far, and from shallow to deep, it is necessary to pass through the already mined surrounding rock broken areas or conduct tunneling in the surrounding rock broken areas when mining difficult-to-mine resources in the later stage. On the other hand, with the increasing degree of mechanization, automation, and intelligence in coal mining, due to the fact that the roadway layout during later mining cannot be fully considered during the previous mining process, it is inevitable to newly excavate roadways in the surrounding rock broken areas during later technical transformation projects. When tunneling in the surrounding rock broken areas, problems such as broken surrounding rock and low strength in the surrounding rock broken areas are often faced. Therefore, at present, when tunneling in the surrounding rock broken area roadways, grouting is a common method for pre-treating the surrounding rock in the surrounding rock broken areas. Due to the broken surrounding rock in the surrounding rock broken areas, the drilled grouting holes cannot remain stable for a long time. Therefore, grouting in the surrounding rock broken areas generally needs to be carried out after inserting a hard grouting pipe into the grouting hole after the grouting hole is drilled. The grouting pipe is generally formed by connecting a solid pipe and a slotted pipe. When grouting in the surrounding rock broken areas, due to the broken surrounding rock, the pressure in the grouting hole is small, and the slurry diffusion range is not a traditional cylinder. Usually, only a large slurry diffusion range can be achieved in the shallow part of the grouting hole, while in the deep part of the grouting hole, due to the small grouting pressure, the grouting range of the slurry is small, forming a conical-like grouting range. The actual amount of slurry injected into the deep part of the grouting hole is far lower than the designed injection amount, resulting in huge safety hazards. Therefore, there is an urgent need for a grouting method and grouting pipeline for the surrounding rock broken area to meet the needs of coal mine grouting safety. Summary of the Invention

[0003] The present invention provides a grouting pipeline and method for a surrounding rock broken area in view of the above problems.

[0004] To achieve the above object, the present invention adopts the following technical solutions: A grouting pipeline for a surrounding rock broken area includes a slurry outlet pressure accumulation pipe and a pressure-bearing slurry outlet pipe, and the slurry outlet pressure accumulation pipe is sleeved inside the pressure-bearing slurry outlet pipe; The slurry discharging pressure accumulating pipe is composed of one expansion pressure accumulating pipe, multiple ordinary pressure accumulating pipes and one end pressure accumulating pipe which are threadedly connected to each other. The expansion pressure accumulating pipe is threadedly connected to the end of the last ordinary pressure accumulating pipe. The expansion pressure accumulating pipe is used to increase the friction force with the pressure-bearing slurry discharging pipe to prevent the slurry discharging pressure accumulating pipe from slipping out of the pressure-bearing slurry discharging pipe during grouting. The end pressure accumulating pipe is threadedly connected to the front end of the first ordinary pressure accumulating pipe. Multiple rows of slurry discharging holes are provided on the expansion pressure accumulating pipe, the ordinary pressure accumulating pipes and the end pressure accumulating pipe, and each row of slurry discharging holes has multiple holes which are arranged evenly in a circle. No slurry discharging holes are provided at the expansion part of the expansion pressure accumulating pipe, and no slurry discharging holes are provided at the front part of the end pressure accumulating pipe.

[0005] Further, the pressure-bearing slurry discharging pipe is composed of one bottom supporting pressure-bearing pipe, multiple ordinary pressure-bearing pipes and one end pressure-bearing pipe which are threadedly connected to each other. The bottom supporting pressure-bearing pipe is threadedly connected to the end of the last ordinary pressure-bearing pipe. The end pressure-bearing pipe is threadedly connected to the front end of the first ordinary pressure-bearing pipe. The end of the bottom supporting pressure-bearing pipe is closed. Multiple rows of slurry discharging holes are provided on the bottom supporting pressure-bearing pipe, the ordinary pressure-bearing pipes and the end pressure-bearing pipe, and each row of slurry discharging holes has multiple holes which are arranged evenly in a circle. No slurry discharging holes are provided at the front part of the end pressure-bearing pipe.

[0006] Still further, the distance between two adjacent rows of slurry discharging holes on the slurry discharging pressure accumulating pipe and the pressure-bearing slurry discharging pipe is the same, and the number of holes in each row of slurry discharging holes is the same.

[0007] Even further, the expansion pressure accumulating pipe includes two connecting pipes. The slurry discharging holes on the expansion pressure accumulating pipe are provided on the connecting pipes. One of the connecting pipes is threadedly connected to the ordinary pressure accumulating pipe, and the end of the other connecting pipe is closed. A rubber pipe is arranged between the two connecting pipes, and multiple steel bars are evenly welded between the two connecting pipes. The rubber pipe is located inside the steel bars, and the rubber pipe and the steel bars form the expansion part of the expansion pressure accumulating pipe.

[0008] Even further, a reference scale is provided at the front end of the end pressure-bearing pipe, and a pressure accumulating scale, a slurry discharging scale and a slurry replenishing scale are provided at the front end of the end pressure accumulating pipe. When the pressure accumulating scale is aligned with the reference scale, all the slurry discharging holes on the slurry discharging pressure accumulating pipe and the pressure-bearing slurry discharging pipe are arranged in a staggered manner. When the reference scale is aligned with the slurry discharging scale, the slurry discharging holes on the ordinary pressure accumulating pipe and the end pressure accumulating pipe coincide with the corresponding slurry discharging holes on the pressure-bearing slurry discharging pipe, and the slurry discharging holes on the expansion pressure accumulating pipe are staggered with the corresponding slurry discharging holes on the pressure-bearing slurry discharging pipe. When the reference scale is aligned with the slurry replenishing scale, the slurry discharging holes on the ordinary pressure accumulating pipe and the end pressure accumulating pipe are staggered with the corresponding slurry discharging holes on the pressure-bearing slurry discharging pipe, and the slurry discharging holes on the expansion pressure accumulating pipe coincide with the corresponding slurry discharging holes on the pressure-bearing slurry discharging pipe.

[0009] Furthermore, a sealing ring is provided at the front part of the inner cavity of the end pressure-bearing pipe to achieve the sealing between the inner wall of the end pressure-bearing pipe and the outer wall of the end pressure-accumulating pipe, preventing the slurry from leaking through the gap between the end pressure-bearing pipe and the end pressure-accumulating pipe during grouting.

[0010] Furthermore, the bottom pressure-bearing pipe, the ordinary pressure-bearing pipe, the end pressure-bearing pipe, the connecting pipe, the ordinary pressure-accumulating pipe, and the end pressure-accumulating pipe are all steel pipes.

[0011] A grouting method for a surrounding rock fractured zone includes the following steps: S1. According to the length of the on-site grouting hole, thread-connect one section of the bottom pressure-bearing pipe, multiple sections of the ordinary pressure-bearing pipes, and one section of the end pressure-bearing pipe together, ensuring that the slurry outlet holes on the bottom pressure-bearing pipe, the ordinary pressure-bearing pipes, and the end pressure-bearing pipe are aligned in each column, and placing the connected pressure-bearing slurry outlet pipe into the grouting hole to protect the grouting hole from collapsing; S2. According to the length of the on-site grouting hole, thread-connect one section of the expansion pressure-accumulating pipe, multiple sections of the ordinary pressure-accumulating pipes, and one section of the end pressure-accumulating pipe together, ensuring that the slurry outlet holes on the ordinary pressure-accumulating pipes and the end pressure-accumulating pipe are aligned in each column, and the slurry outlet holes on the expansion pressure-accumulating pipe and the ordinary pressure-accumulating pipes are staggered in each column, and sleeving the connected slurry outlet pressure-accumulating pipe inside the pressure-bearing slurry outlet pipe; S3. Rotate the slurry outlet pressure-accumulating pipe to align the pressure-accumulating scale on the end pressure-accumulating pipe with the corresponding scale on the end pressure-bearing pipe, so that all the slurry outlet holes on the slurry outlet pressure-accumulating pipe and the pressure-bearing slurry outlet pipe are arranged in a staggered manner; S4. Connect the front end of the end pressure-accumulating pipe to the grouting pump through a pipeline, open the grouting pump to inject the slurry into the slurry outlet pressure-accumulating pipe for pressure accumulation. At this time, all the slurry outlet holes on the slurry outlet pressure-accumulating pipe and the pressure-bearing slurry outlet pipe are staggered, forming a closed space as a whole, and the slurry fills the entire slurry outlet pressure-accumulating pipe, ensuring uniform distribution of the pressure inside the slurry outlet pressure-accumulating pipe; S5. When the pressure in the slurry outlet pressure-accumulating pipe reaches the set value, rotate the slurry outlet pressure-accumulating pipe to align the slurry outlet scale on the end pressure-accumulating pipe with the corresponding scale on the end pressure-bearing pipe. At this time, the slurry outlet holes on the ordinary pressure-accumulating pipes and the end pressure-accumulating pipe coincide with the corresponding slurry outlet holes on the pressure-bearing slurry outlet pipe, and the slurry outlet holes on the expansion pressure-accumulating pipe are staggered from the corresponding slurry outlet holes on the pressure-bearing slurry outlet pipe, and start the preliminary grouting work; S6. After the preliminary grouting work is completed, rotate the slurry outlet pressure-accumulating pipe to align the supplementary grouting scale on the end pressure-accumulating pipe with the corresponding scale on the end pressure-bearing pipe. At this time, the slurry outlet holes on the ordinary pressure-accumulating pipes and the end pressure-accumulating pipe are staggered from the corresponding slurry outlet holes on the pressure-bearing slurry outlet pipe, and the slurry outlet holes on the expansion pressure-accumulating pipe coincide with the corresponding slurry outlet holes on the pressure-bearing slurry outlet pipe, and start the supplementary grouting work; S7. After the grouting holes at the position where the expansion accumulator pipe is located have completed the supplementary grouting work, remove the outermost ordinary accumulator pipe and reconnect the remaining parts, and perform the supplementary grouting work on the next position. S8. Repeat S7 to perform sectional supplementary grouting on the entire grouting hole until the supplementary grouting work on the entire grouting hole is completed. S9. After the supplementary grouting work is completed, take out the slurry outlet accumulator pipe for disassembly, and gradually disassemble and withdraw the pressure-bearing slurry outlet pipe to complete the grouting work.

[0012] Compared with the prior art, the present invention has the following advantages: 1. Significantly improve the grouting uniformity: When the traditional grouting method operates in the surrounding rock broken area, due to the broken surrounding rock and uneven pressure in the grouting holes, the slurry diffusion range shows an irregular shape. Especially in the deep part of the grouting hole, the amount of slurry injected is often insufficient. The present invention innovatively adopts the nested design of the slurry outlet accumulator pipe and the pressure-bearing slurry outlet pipe. During the pressure accumulation stage, the slurry fills the entire slurry outlet accumulator pipe to ensure uniform pressure distribution. When the slurry outlet accumulator pipe is rotated to make the slurry outlet holes on the ordinary accumulator pipe and the end accumulator pipe coincide with the corresponding slurry outlet holes on the pressure-bearing slurry outlet pipe, the slurry can be evenly injected within the entire length range of the grouting hole, effectively solving the problem of limited slurry diffusion range in the deep part, significantly improving the grouting effect, and enhancing the safety and reliability of production in the surrounding rock broken area. 2. Enhance the pertinence and flexibility of supplementary injection: After the initial grouting work of the present invention is completed, by rotating the slurry outlet accumulator pipe again to make the slurry outlet holes on the expansion accumulator pipe coincide with the corresponding slurry outlet holes on the pressure-bearing slurry outlet pipe, while gradually withdrawing and disassembling the ordinary accumulator pipe, sectional supplementary injection is carried out in the grouting hole. This process can focus on supplementary injection for the weak areas within the grouting range, thereby further improving the grouting effect of the roadway. Moreover, the supplementary injection operation can be completed by simply rotating the slurry outlet accumulator pipe at a fixed angle, which is simple and easy to operate, effectively improving the flexibility and supplementary injection efficiency of the grouting operation. 3. Ensure the safety of the grouting process: The design of the expansion accumulator pipe is a major highlight of the present invention. During the grouting process, when the expansion accumulator pipe is under internal pressure, the rubber tube between the steel bars bulges out, increasing the pressure between it and the pressure-bearing slurry outlet pipe, thereby preventing the slurry outlet accumulator pipe from slipping out under high pressure and avoiding harm to the personnel and equipment in the roadway, greatly improving the production safety.

[0013] 4. Improve the pipe adaptability and recycling rate: Both the slurry outlet accumulator pipe and the pressure-bearing slurry outlet pipe adopt threaded connection methods, which can be flexibly combined according to the different lengths of the grouting holes to meet diverse construction requirements, facilitating transportation and installation. At the same time, the steel pipe has high strength and can withstand the pressure of the crushed stones in the surrounding rock broken area, ensuring the integrity of the pipeline after grouting and enabling it to be recycled, reducing the construction cost and achieving the efficient utilization of resources. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of the present invention; Figure 2 It is a schematic structural diagram of the slurry discharging and pressure accumulating pipe of the present invention; Figure 3 It is a schematic structural diagram of the pressure-bearing slurry discharging pipe of the present invention; Figure 4 It is a schematic structural diagram of the expansion pressure accumulating pipe of the present invention; Figure 5 It is a schematic structural diagram of the ordinary pressure accumulating pipe of the present invention; Figure 6 It is a schematic structural diagram of the end pressure accumulating pipe of the present invention; Figure 7 It is a schematic structural diagram of the bottom supporting pressure-bearing pipe of the present invention; Figure 8 It is a schematic structural diagram of the ordinary pressure-bearing pipe of the present invention; Figure 9 It is a schematic structural diagram of the end pressure-bearing pipe of the present invention; Figure 10 It is a schematic diagram of the cooperation between the pressure-bearing slurry discharging pipe and the ordinary pressure accumulating pipe when the comparison scale is aligned with the pressure accumulating scale of the present invention; Figure 11 It is a schematic diagram of the cooperation between the pressure-bearing slurry discharging pipe and the expansion pressure accumulating pipe when the comparison scale is aligned with the pressure accumulating scale of the present invention; Figure 12 It is a schematic diagram of the cooperation between the pressure-bearing slurry discharging pipe and the ordinary pressure accumulating pipe when the slurry discharging scale is aligned with the pressure accumulating scale of the present invention; Figure 13 It is a schematic diagram of the cooperation between the pressure-bearing slurry discharging pipe and the expansion pressure accumulating pipe when the slurry replenishing scale is aligned with the pressure accumulating scale of the present invention; In the figure, the slurry discharging and pressure accumulating pipe 1, the pressure-bearing slurry discharging pipe 2, the slurry discharging hole 3, the expansion pressure accumulating pipe 101, the ordinary pressure accumulating pipe 102, the end pressure accumulating pipe 103, the pressure accumulating scale 104, the slurry discharging scale 105, the slurry replenishing scale 106, the bottom supporting pressure-bearing pipe 201, the ordinary pressure-bearing pipe 202, the end pressure-bearing pipe 203, the comparison scale 204, the sealing ring 205, the connecting pipe 1011, the rubber pipe 1012, and the steel bar 1013. Specific embodiments

[0015] In order to further elaborate the technical solution of the present invention, the present invention will be further described below through embodiments.

[0016] As Figures 1 to 13 shown, a grouting pipeline in a surrounding rock broken area includes a slurry discharging and pressure accumulating pipe 1 and a pressure-bearing slurry discharging pipe 2, and the slurry discharging and pressure accumulating pipe 1 is sleeved inside the pressure-bearing slurry discharging pipe 2.

[0017] The slurry discharging pressure accumulating pipe 1 is composed of one section of expansion pressure accumulating pipe 101, multiple sections of ordinary pressure accumulating pipes 102 and one section of end pressure accumulating pipe 103 which are threadedly connected to each other. The expansion pressure accumulating pipe 101 is threadedly connected to the end of the last section of ordinary pressure accumulating pipe 102. The expansion pressure accumulating pipe 101 is used to increase the friction force with the pressure-bearing slurry discharging pipe 2 to prevent the slurry discharging pressure accumulating pipe 1 from slipping out of the pressure-bearing slurry discharging pipe 2 during grouting. The end pressure accumulating pipe 103 is threadedly connected to the front end of the first section of ordinary pressure accumulating pipe 102. Multiple rows of slurry discharging holes 3 are provided on the expansion pressure accumulating pipe 101, the ordinary pressure accumulating pipes 102 and the end pressure accumulating pipe 103, and each row of slurry discharging holes 3 has multiple holes which are arranged in a circumferentially uniform manner. No slurry discharging hole 3 is provided at the expansion part of the expansion pressure accumulating pipe 101, and no slurry discharging hole 3 is provided at the front part of the end pressure accumulating pipe 103. The expansion pressure accumulating pipe 101 includes two connecting pipes 1011. The slurry discharging holes 3 on the expansion pressure accumulating pipe 101 are provided on the connecting pipes 1011. One of the connecting pipes 1011 is threadedly connected to the ordinary pressure accumulating pipe 102, and the end of the other connecting pipe 1011 is closed. A rubber pipe 1012 is arranged between the two connecting pipes 1011, and multiple steel bars 1013 are evenly welded between the two connecting pipes 1011. The rubber pipe 1012 is located inside the steel bars 1013. The rubber pipe 1012 and the steel bars 1013 form the expansion part of the expansion pressure accumulating pipe 101.

[0018] The pressure-bearing slurry outlet pipe 2 is composed of a bottom-bearing pressure pipe 201, multiple ordinary pressure pipes 202, and a head-end pressure pipe 203 that are threadedly connected to each other. The bottom-bearing pressure pipe 201 is threadedly connected to the end of the last ordinary pressure pipe 202, and the head-end pressure pipe 203 is threadedly connected to the front end of the first ordinary pressure pipe 202. The end of the bottom-bearing pressure pipe 201 is closed. Multiple rows of slurry outlet holes 3 are provided on the bottom-bearing pressure pipe 201, ordinary pressure pipes 202, and head-end pressure pipe 203, and each row of slurry outlet holes 3 has multiple holes, which are arranged in a circumferential and uniform manner. No slurry outlet hole 3 is provided in the front part of the head-end pressure pipe 203. The spacing between adjacent rows of slurry outlet holes 3 on the slurry outlet pressure-accumulating pipe 1 and the pressure-bearing slurry outlet pipe 2 is the same, and the number of each row of slurry outlet holes 3 is the same. A sealing ring 205 is provided in the front part of the inner cavity of the head-end pressure pipe 203 to achieve the seal between the inner wall of the head-end pressure pipe 203 and the outer wall of the head-end pressure-accumulating pipe 103, preventing slurry leakage from the gap between the head-end pressure pipe 203 and the head-end pressure-accumulating pipe 103 during grouting. A reference scale 204 is provided at the front end of the head-end pressure pipe 203, and a pressure-accumulating scale 104, a slurry outlet scale 105, and a slurry replenishing scale 106 are provided at the front end of the head-end pressure-accumulating pipe 103. When the pressure-accumulating scale 104 and the reference scale 204 are aligned, all the slurry outlet holes 3 on the slurry outlet pressure-accumulating pipe 1 and the pressure-bearing slurry outlet pipe 2 are arranged in a staggered manner. When the reference scale 204 is aligned with the slurry outlet scale 105, the slurry outlet holes 3 on the ordinary pressure-accumulating pipe 102 and the head-end pressure-accumulating pipe 103 coincide with the slurry outlet holes 3 at the corresponding positions on the pressure-bearing slurry outlet pipe 2, and the slurry outlet holes 3 on the expansion pressure-accumulating pipe 101 are arranged in a staggered manner with the slurry outlet holes 3 at the corresponding positions on the pressure-bearing slurry outlet pipe 2. When the reference scale 204 is aligned with the slurry replenishing scale 106, the slurry outlet holes 3 on the ordinary pressure-accumulating pipe 102 and the head-end pressure-accumulating pipe 103 are arranged in a staggered manner with the slurry outlet holes 3 at the corresponding positions on the pressure-bearing slurry outlet pipe 2, and the slurry outlet holes 3 on the expansion pressure-accumulating pipe 101 coincide with the slurry outlet holes 3 at the corresponding positions on the pressure-bearing slurry outlet pipe 2.

[0019] The bottom-bearing pressure pipe 201, ordinary pressure pipes 202, head-end pressure pipe 203, connecting pipe 1011, ordinary pressure-accumulating pipe 102, and head-end pressure-accumulating pipe 103 are all steel pipes.

[0020] A grouting method for a surrounding rock broken area includes the following steps: S1. According to the length of the on-site grouting hole, threadedly connect a bottom-bearing pressure pipe 201, multiple ordinary pressure pipes 202, and a head-end pressure pipe 203 to ensure that the slurry outlet holes 3 on the bottom-bearing pressure pipe 201, ordinary pressure pipes 202, and head-end pressure pipe 203 are aligned in each column, and place the connected pressure-bearing slurry outlet pipe 2 into the grouting hole to prevent the grouting hole from collapsing; S2. According to the length of the on-site grouting holes, screw-connect one expansion pressure storage pipe 101, multiple ordinary pressure storage pipes 102 and one end pressure storage pipe 103 to each other, ensuring that the slurry outlet holes 3 on the ordinary pressure storage pipes 102 and the end pressure storage pipe 103 are aligned in each column, and the slurry outlet holes 3 on the expansion pressure storage pipe 101 and the ordinary pressure storage pipes 102 are staggered in each column. Then, sleeved the connected slurry outlet pressure storage pipe 1 into the internal of the pressure-bearing slurry outlet pipe 2; S3. Rotate the slurry outlet pressure storage pipe 1 to align the pressure storage scale 104 on the end pressure storage pipe 103 with the control scale 204 on the end pressure-bearing pipe 203, so that all the slurry outlet holes 3 on the slurry outlet pressure storage pipe 1 and the slurry outlet holes 3 on the pressure-bearing slurry outlet pipe 2 are arranged in a staggered manner; S4. Connect the front end of the end pressure storage pipe 103 to the grouting pump through a pipeline, and open the grouting pump to inject the slurry into the slurry outlet pressure storage pipe 1 for pressure storage. At this time, all the slurry outlet holes 3 on the slurry outlet pressure storage pipe 1 and the slurry outlet holes 3 on the pressure-bearing slurry outlet pipe 2 are staggered, forming a closed space as a whole. The slurry fills the entire slurry outlet pressure storage pipe 1 to ensure uniform distribution of the pressure inside the slurry outlet pressure storage pipe 1; S5. When the pressure in the slurry outlet pressure storage pipe 1 reaches the set value, rotate the slurry outlet pressure storage pipe 1 to align the slurry outlet scale 105 on the end pressure storage pipe 103 with the control scale 204 on the end pressure-bearing pipe 203. At this time, the slurry outlet holes 3 on the ordinary pressure storage pipes 102 and the end pressure storage pipe 103 coincide with the slurry outlet holes 3 at the corresponding positions on the pressure-bearing slurry outlet pipe 2, and the slurry outlet holes 3 on the expansion pressure storage pipe 101 are staggered with the slurry outlet holes 3 at the corresponding positions on the pressure-bearing slurry outlet pipe 2, and start the preliminary grouting work; S6. After the preliminary grouting work is completed, rotate the slurry outlet pressure storage pipe 1 to align the supplementary grouting scale 106 on the end pressure storage pipe 103 with the control scale 204 on the end pressure-bearing pipe 203. At this time, the slurry outlet holes 3 on the ordinary pressure storage pipes 102 and the end pressure storage pipe 103 are staggered with the slurry outlet holes 3 at the corresponding positions on the pressure-bearing slurry outlet pipe 2, and the slurry outlet holes 3 on the expansion pressure storage pipe 101 coincide with the slurry outlet holes 3 at the corresponding positions on the pressure-bearing slurry outlet pipe 2, and start the supplementary grouting work; S7. After the grouting hole where the expansion pressure storage pipe 101 is located is completed with the supplementary grouting work, remove the outermost ordinary pressure storage pipe 102 at the front end, reconnect the remaining parts, and carry out the supplementary grouting work for the next position; S8. Repeat S7 to carry out supplementary grouting for each section of the entire grouting hole until the supplementary grouting work for the entire grouting hole is completed; S9. After the supplementary grouting work is completed, take out the slurry outlet pressure storage pipe 1 for disassembly, and gradually disassemble and withdraw the pressure-bearing slurry outlet pipe 2 to complete the grouting work.

[0021] The main features and advantages of the present invention have been shown and described above. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to embrace all changes that fall within the meaning and scope of the equivalent elements of the claims within the present invention.

[0022] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A grouting pipeline for surrounding rock crushing area, characterized by: It comprises a slurry discharge pressure storage pipe (1) and a pressure-bearing slurry discharge pipe (2), wherein the slurry discharge pressure storage pipe (1) is sleeved inside the pressure-bearing slurry discharge pipe (2); The slurry discharge pressure storage pipe (1) is composed of an expansion pressure storage pipe (101), a plurality of common pressure storage pipes (102), and an end pressure storage pipe (103) which are threadedly connected to each other. The expansion pressure storage pipe (101) is threadedly connected to the end of the last common pressure storage pipe (102). The expansion pressure storage pipe (101) is used to increase the friction with the pressure-bearing slurry discharge pipe (2) to prevent the slurry discharge pressure storage pipe (1) from slipping out of the pressure-bearing slurry discharge pipe (2) during grouting. The pressure storage tube (103) is threadedly connected to the front end of the first section of the common pressure storage tube (102); a plurality of slurry discharge holes (3) are provided on the expansion pressure storage tube (101), the common pressure storage tube (102) and the end pressure storage tube (103); and each slurry discharge hole (3) has a plurality of slurry discharge holes (3) which are evenly arranged in a circle; no slurry discharge hole (3) is provided at the expansion portion of the expansion pressure storage tube (101); and no slurry discharge hole (3) is provided at the front portion of the end pressure storage tube (103).

2. A grouting pipeline for surrounding rock crushing area according to claim 1, characterized in that: The pressure-bearing slurry discharge pipe (2) is composed of a bottom-supporting pressure pipe (201), a plurality of common pressure pipes (202) and an end pressure pipe (203) which are threadedly connected to each other. The bottom-supporting pressure pipe (201) is threadedly connected to the end of the last common pressure pipe (202), and the end pressure pipe (203) is threadedly connected to the front end of the first common pressure pipe (202). The end of the bottom-supporting pressure pipe (201) is closed. A plurality of slurry discharge holes (3) are provided on the bottom-supporting pressure pipe (201), the common pressure pipe (202) and the end pressure pipe (203). Each slurry discharge hole (3) has a plurality of holes which are evenly arranged in a circle. No slurry discharge hole (3) is provided in the front part of the end pressure pipe (203).

3. A grouting pipeline for surrounding rock crushing area according to claim 2, characterized in that: The spacing between two adjacent pulp discharge holes (3) on the pulp discharge pressure storage pipe (1) and the pressure-bearing pulp discharge pipe (2) is the same, and the number of each pulp discharge hole (3) is the same.

4. A grouting pipeline for surrounding rock crushing area according to claim 3, characterized in that: The expansion pressure storage tube (101) comprises two connecting tubes (1011); the slurry outlet holes (3) on the expansion pressure storage tube (101) are provided on the connecting tubes (1011); one of the connecting tubes (1011) is threadedly connected to a common pressure storage tube (102); the end of the other connecting tube (1011) is closed; a rubber tube (1012) is provided between the two connecting tubes (1011); a plurality of steel bars (1013) are evenly welded between the two connecting tubes (1011); the rubber tube (1012) is located on the inner side of the steel bars (1013); and the rubber tube (1012) and the steel bars (1013) constitute an expansion portion of the expansion pressure storage tube (101).

5. A grouting pipeline for surrounding rock crushing area according to claim 4, characterized in that: A reference scale (204) is provided at the front end of the end pressure-bearing pipe (203); a pressure storage scale (104), a slurry discharge scale (105) and a slurry replenishment scale (106) are provided at the front end of the end pressure storage pipe (103); when the pressure storage scale (104) and the reference scale (204) are aligned, the slurry discharge hole (3) of the slurry discharge pressure storage pipe (1) and the slurry discharge hole (3) on the pressure-bearing slurry discharge pipe (2) are all arranged in an offset manner; when the reference scale (204) and the slurry discharge scale (105) are aligned, the slurry discharge holes on the common pressure storage pipe (102) and the end pressure storage pipe (103) are aligned. The slurry outlet hole (3) of the expansion pressure accumulator pipe (101) is aligned with the slurry outlet hole (3) at the corresponding position on the pressure-bearing slurry outlet pipe (2); the slurry outlet hole (3) of the expansion pressure accumulator pipe (101) is offset from the slurry outlet hole (3) at the corresponding position on the pressure-bearing slurry outlet pipe (2); when the reference scale (204) is aligned with the slurry replenishment scale (106), the slurry outlet hole (3) of the common pressure accumulator pipe (102) and the end pressure accumulator pipe (103) is offset from the slurry outlet hole (3) at the corresponding position on the pressure-bearing slurry outlet pipe (2); the slurry outlet hole (3) of the expansion pressure accumulator pipe (101) is aligned with the slurry outlet hole (3) at the corresponding position on the pressure-bearing slurry outlet pipe (2).

6. A grouting pipeline for surrounding rock crushing area according to claim 5, characterized in that: A sealing ring (205) is provided at the front of the inner cavity of the end pressure-bearing tube (203) to achieve sealing between the inner wall of the end pressure-bearing tube (203) and the outer wall of the end pressure-accumulating tube (103), thereby preventing grout from escaping from the gap between the end pressure-bearing tube (203) and the end pressure-accumulating tube (103) during grouting.

7. A grouting pipeline for surrounding rock crushing area according to claim 6, characterized in that: The bottom pressure-bearing pipe (201), the common pressure-bearing pipe (202), the end pressure-bearing pipe (203), the connecting pipe (1011), the common pressure-accumulating pipe (102) and the end pressure-accumulating pipe (103) are all steel pipes.

8. A method for grouting a surrounding rock crushing area, using a surrounding rock crushing area grouting pipeline as claimed in claim 6, characterized in that: The following steps are involved: S1, according to the length of the on-site grouting hole, a section of the bottom supporting pressure-bearing pipe (201), a plurality of sections of the common pressure-bearing pipe (202) and a section of the end pressure-bearing pipe (203) are mutually threadedly connected, ensuring that the grouting holes (3) on the bottom supporting pressure-bearing pipe (201), the common pressure-bearing pipe (202) and the end pressure-bearing pipe (203) are aligned in each row, and the connected pressure-bearing grouting pipe (2) is placed into the grouting hole to protect the grouting hole from collapse; S2, according to the length of the on-site grouting hole, a section of expansion pressure storage pipe (101), a plurality of sections of common pressure storage pipes (102) and a section of end pressure storage pipe (103) are mutually threadedly connected, ensuring that the slurry outlet holes (3) on the common pressure storage pipe (102) and the end pressure storage pipe (103) are aligned in each row, and the slurry outlet holes (3) on the expansion pressure storage pipe (101) and the slurry outlet holes (3) on the common pressure storage pipe (102) are staggered in each row, and the connected slurry outlet pressure storage pipe (1) is sleeved into the interior of the pressure-bearing slurry outlet pipe (2); S3, rotating the slurry discharge pressure storage pipe (1) so that the pressure storage scale (104) on the end pressure storage pipe (103) is aligned with the control scale (204) on the end pressure bearing pipe (203), so that the slurry discharge hole (3) on the slurry discharge pressure storage pipe (1) and the slurry discharge hole (3) on the pressure bearing slurry discharge pipe (2) are all arranged in an offset manner; S4, connecting the front end of the end pressure accumulation pipe (103) to the grouting pump through a pipeline, turning on the grouting pump to inject slurry into the slurry discharge pressure accumulation pipe (1) for pressure accumulation, at which time the slurry discharge hole (3) on the slurry discharge pressure accumulation pipe (1) and the slurry discharge hole (3) on the pressure-bearing slurry discharge pipe (2) are all misaligned to form a closed space as a whole, and the slurry fills the entire slurry discharge pressure accumulation pipe (1), ensuring that the pressure inside the slurry discharge pressure accumulation pipe (1) is evenly distributed; S5, when the pressure in the slurry discharge pressure accumulator pipe (1) reaches a set value, the slurry discharge pressure accumulator pipe (1) is rotated so that the slurry discharge scale (105) on the end pressure accumulator pipe (103) is aligned with the reference scale (204) on the end pressure-bearing pipe (203), at which time the slurry discharge holes (3) on the common pressure accumulator pipe (102) and the end pressure accumulator pipe (103) coincide with the slurry discharge holes (3) at corresponding positions on the pressure-bearing slurry discharge pipe (2), and the slurry discharge holes (3) on the expansion pressure accumulator pipe (101) are offset from the slurry discharge holes (3) at corresponding positions on the pressure-bearing slurry discharge pipe (2), and the initial grouting work is started; S6, after the initial grouting work is completed, the grout discharge pressure storage pipe (1) is rotated so that the grouting scale (106) on the end pressure storage pipe (103) is aligned with the control scale (204) on the end pressure bearing pipe (203). At this time, the grout discharge holes (3) on the common pressure storage pipe (102) and the end pressure storage pipe (103) are misaligned with the grout discharge holes (3) at corresponding positions on the pressure bearing grout discharge pipe (2), and the grout discharge holes (3) on the expansion pressure storage pipe (101) are overlapped with the grout discharge holes (3) at corresponding positions on the pressure bearing grout discharge pipe (2), and the grouting work is started; S7, after the grouting work of the grouting hole at the location where the expansion pressure accumulator tube (101) is located is completed, the frontmost common pressure accumulator tube (102) is removed, and the remaining parts are reconnected to perform grouting work at the next location; S8, repeating S7, grouting the entire grouting hole section by section until the grouting work of the entire grouting hole is completed; S9, after the grouting work is completed, the grouting pressure storage pipe (1) is taken out and disassembled, and the pressure grouting pipe (2) is disassembled and withdrawn section by section to complete the grouting work.

Images