A grouting pipeline and method for a surrounding rock broken zone

Abstract

The present invention belongs to the technical field of mine grouting, and specifically relates to a grouting pipeline and method for a surrounding rock broken area. The grouting pipeline for the 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 present invention innovatively adopts the nested design of the slurry outlet pressure accumulation pipe and the pressure-bearing slurry outlet pipe. During the pressure accumulation stage, the slurry fills the entire slurry outlet pressure accumulation pipe to ensure uniform pressure distribution. When the slurry outlet pressure accumulation pipe is rotated so that the slurry outlet holes on the ordinary pressure accumulation pipe and the end pressure accumulation pipe coincide with the slurry outlet holes at the corresponding positions on the pressure-bearing slurry outlet pipe, the slurry can be uniformly injected within the entire length range of the grouting hole, effectively solving the problem of limited diffusion range of deep slurry, significantly improving the grouting effect, and enhancing the safety and reliability of production in the surrounding rock broken area.

Description

Technical Field

[0001] The 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 several years of underground coal mining, a large number of surrounding rock broken areas have been formed. Since underground coal mining 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 improvement of the mechanization, automation, and intelligence levels of coal mining, due to the fact that the roadway layout in the later stage cannot be fully considered during the early mining process, it is inevitable to newly excavate roadways in the surrounding rock broken areas during the 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 roadways of the surrounding rock broken areas, 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 in the shallow part of the grouting hole can a large slurry diffusion range be achieved, 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 potential 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 invention provides a grouting pipeline and method for a surrounding rock broken area aiming at the above problems.

[0004] To achieve the above object, the invention adopts the following technical solutions:

[0005] A grouting pipeline for a surrounding rock broken area includes a slurry outlet pressure storage pipe and a pressure-bearing slurry outlet pipe, and the slurry outlet pressure storage pipe is sleeved inside the pressure-bearing slurry outlet pipe;

[0006] The slurry outlet pressure storage pipe is composed of one expansion pressure storage pipe, multiple ordinary pressure storage pipes and one end pressure storage pipe which are threadedly connected to each other. The expansion pressure storage pipe is threadedly connected to the end of the last ordinary pressure storage pipe. The expansion pressure storage pipe is used to increase the friction with the pressure-bearing slurry outlet pipe to prevent the slurry outlet pressure storage pipe from slipping out of the pressure-bearing slurry outlet pipe during grouting. The end pressure storage pipe is threadedly connected to the front end of the first ordinary pressure storage pipe. Multiple rows of slurry outlet holes are provided on the expansion pressure storage pipe, the ordinary pressure storage pipes and the end pressure storage pipe, and each row of slurry outlet holes has multiple holes which are arranged evenly in a circle. No slurry outlet holes are provided at the expansion part of the expansion pressure storage pipe, and no slurry outlet holes are provided at the front part of the end pressure storage pipe.

[0007] Furthermore, the pressure-bearing slurry outlet 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 outlet 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 outlet holes has multiple holes which are arranged evenly in a circle. No slurry outlet holes are provided at the front part of the end pressure-bearing pipe.

[0008] Still further, the distance between two adjacent rows of slurry outlet holes on the slurry outlet pressure storage pipe and the pressure-bearing slurry outlet pipe is the same, and the number of each row of slurry outlet holes is the same.

[0009] Even further, the expansion pressure storage pipe includes two connecting pipes. The slurry outlet holes on the expansion pressure storage pipe are provided on the connecting pipes. One of the connecting pipes is threadedly connected to the ordinary pressure storage 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 storage pipe.

[0010] Even further, a reference scale is provided at the front end of the end pressure-bearing pipe, and a pressure storage scale, a slurry outlet scale and a slurry replenishment scale are provided at the front end of the end pressure storage pipe. When the pressure storage scale is aligned with the reference scale, all the slurry outlet holes on the slurry outlet pressure storage pipe and the slurry outlet holes on the pressure-bearing slurry outlet pipe are arranged in a staggered manner. When the reference scale is aligned with the slurry outlet scale, the slurry outlet holes on the ordinary pressure storage pipe and the end pressure storage pipe coincide with the slurry outlet holes at the corresponding positions on the pressure-bearing slurry outlet pipe, and the slurry outlet holes on the expansion pressure storage pipe are staggered from the slurry outlet holes at the corresponding positions on the pressure-bearing slurry outlet pipe. When the reference scale is aligned with the slurry replenishment scale, the slurry outlet holes on the ordinary pressure storage pipe and the end pressure storage pipe are staggered from the slurry outlet holes at the corresponding positions on the pressure-bearing slurry outlet pipe, and the slurry outlet holes on the expansion pressure storage pipe coincide with the slurry outlet holes at the corresponding positions on the pressure-bearing slurry outlet pipe.

[0011] 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.

[0012] 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.

[0013] A grouting method for a surrounding rock broken area includes the following steps:

[0014] S1. According to the length of the on-site grouting hole, screw-connect one bottom pressure-bearing pipe, multiple ordinary pressure-bearing pipes and one end pressure-bearing pipe to ensure that the slurry outlet holes on the bottom pressure-bearing pipe, the ordinary pressure-bearing pipe and the end pressure-bearing pipe are aligned in each column, and place the connected pressure-bearing slurry outlet pipe into the grouting hole to protect the grouting hole from collapsing.

[0015] S2. According to the length of the on-site grouting hole, screw-connect one expansion pressure-accumulating pipe, multiple ordinary pressure-accumulating pipes and one end pressure-accumulating pipe to ensure that the slurry outlet holes on the ordinary pressure-accumulating pipe 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 pipe are staggered in each column, and sleevethe connected slurry outlet and pressure-accumulating pipe inside the pressure-bearing slurry outlet pipe.

[0016] S3. Rotate the slurry outlet and pressure-accumulating pipe to align the pressure-accumulating scale on the end pressure-accumulating pipe with the control scale on the end pressure-bearing pipe, so that all the slurry outlet holes on the slurry outlet and pressure-accumulating pipe and the pressure-bearing slurry outlet pipe are arranged in a staggered manner.

[0017] 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 and pressure-accumulating pipe for pressure accumulation. At this time, all the slurry outlet holes on the slurry outlet and 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 and pressure-accumulating pipe to ensure uniform distribution of the pressure inside the slurry outlet and pressure-accumulating pipe.

[0018] S5. When the pressure in the slurry outlet and pressure-accumulating pipe reaches the set value, rotate the slurry outlet and pressure-accumulating pipe to align the slurry outlet scale on the end pressure-accumulating pipe with the control scale on the end pressure-bearing pipe. At this time, the slurry outlet holes on the ordinary pressure-accumulating pipe 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 with the corresponding slurry outlet holes on the pressure-bearing slurry outlet pipe, and start the preliminary grouting work.

[0019] S6. After the preliminary grouting work is completed, rotate the grout outlet pressure accumulation pipe to align the grout replenishment scale on the end pressure accumulation pipe with the corresponding scale on the end pressure-bearing pipe. At this time, the grout outlet holes on the ordinary pressure accumulation pipe and the end pressure accumulation pipe are misaligned with the grout outlet holes at the corresponding positions on the pressure-bearing grout outlet pipe, and the grout outlet holes on the expansion pressure accumulation pipe coincide with the grout outlet holes at the corresponding positions on the pressure-bearing grout outlet pipe, and start the grout replenishment work;

[0020] S7. After the grout replenishment work for the grouting holes where the expansion pressure accumulation pipes are located is completed, remove the outermost ordinary pressure accumulation pipe and reconnect the remaining parts to carry out the grout replenishment work for the next position;

[0021] S8. Repeat S7 to carry out section-by-section grout replenishment for the entire grouting hole until the grout replenishment work for the entire grouting hole is completed;

[0022] S9. After the grout replenishment work is completed, take out the grout outlet pressure accumulation pipe for disassembly, and gradually disassemble and withdraw the pressure-bearing grout outlet pipe to complete the grouting work.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] 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 diffusion range of the grout shows an irregular shape. Especially in the deep part of the grouting hole, the amount of grout injection is often insufficient. The present invention innovatively adopts the nested design of the grout outlet pressure accumulation pipe and the pressure-bearing grout outlet pipe. During the pressure accumulation stage, the grout fills the entire grout outlet pressure accumulation pipe to ensure uniform pressure distribution. When the grout outlet pressure accumulation pipe is rotated to make the grout outlet holes on the ordinary pressure accumulation pipe and the end pressure accumulation pipe coincide with the grout outlet holes at the corresponding positions on the pressure-bearing grout outlet pipe, the grout can be evenly injected within the entire length range of the grouting hole, effectively solving the problem of limited diffusion range of the deep grout, significantly improving the grouting effect, and enhancing the safety and reliability of production in the surrounding rock broken area;

[0025] 2. Enhance the pertinence and flexibility of supplementary injection: After the preliminary grouting work of the present invention is completed, by rotating the grout outlet pressure accumulation pipe again, the grout outlet holes on the expansion pressure accumulation pipe are made to coincide with the grout outlet holes at the corresponding positions on the pressure-bearing grout outlet pipe. While gradually withdrawing and disassembling the ordinary pressure accumulation pipe, section-by-section 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 grout outlet pressure accumulation pipe by a fixed angle, which is simple and easy to operate, effectively improving the flexibility and supplementary injection efficiency of the grouting operation;

[0026] 3. Ensure the safety of the grouting process: The design of the expansion pressure storage pipe is a major highlight of the present invention. During the grouting process, when the expansion pressure storage pipe is under internal pressure, the rubber pipe between the steel bars bulges out, increasing the pressure between it and the pressure-bearing slurry outlet pipe, thereby preventing the slurry outlet pressure storage pipe from slipping out under high pressure and avoiding harm to the personnel and equipment in the roadway, greatly improving the production safety.

[0027] 4. Improve the pipeline adaptability and recycling rate: Both the slurry outlet pressure storage pipe and the pressure-bearing slurry outlet pipe adopt threaded connection methods, which can be flexibly combined according to the lengths of different 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 fracture zone, 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic structural diagram of the present invention;

[0029] Figure 2 is a schematic structural diagram of the slurry outlet pressure storage pipe of the present invention;

[0030] Figure 3 is a schematic structural diagram of the pressure-bearing slurry outlet pipe of the present invention;

[0031] Figure 4 is a schematic structural diagram of the expansion pressure storage pipe of the present invention;

[0032] Figure 5 is a schematic structural diagram of the ordinary pressure storage pipe of the present invention;

[0033] Figure 6 is a schematic structural diagram of the end pressure storage pipe of the present invention;

[0034] Figure 7 is a schematic structural diagram of the bottom pressure-bearing pipe of the present invention;

[0035] Figure 8 is a schematic structural diagram of the ordinary pressure-bearing pipe of the present invention;

[0036] Figure 9 is a schematic structural diagram of the end pressure-bearing pipe of the present invention;

[0037] Figure 10 is a schematic diagram of the cooperation between the pressure-bearing slurry outlet pipe and the ordinary pressure storage pipe when the comparison scale is aligned with the pressure storage scale of the present invention;

[0038] Figure 11 is a schematic diagram of the cooperation between the pressure-bearing slurry outlet pipe and the expansion pressure storage pipe when the comparison scale is aligned with the pressure storage scale of the present invention;

[0039] Figure 12Schematic diagram of the cooperation between the pressure-bearing slurry outlet pipe and the ordinary pressure accumulation pipe when the slurry outlet scale and the pressure accumulation scale of the present invention are aligned;

[0040] Figure 13 Schematic diagram of the cooperation between the pressure-bearing slurry outlet pipe and the expansion pressure accumulation pipe when the slurry replenishment scale and the pressure accumulation scale of the present invention are aligned;

[0041] In the figure, there are slurry outlet and pressure accumulation pipe 1, pressure-bearing slurry outlet pipe 2, slurry outlet hole 3, expansion pressure accumulation pipe 101, ordinary pressure accumulation pipe 102, end pressure accumulation pipe 103, pressure accumulation scale 104, slurry outlet scale 105, slurry replenishment scale 106, bottom support pressure-bearing pipe 201, ordinary pressure-bearing pipe 202, end pressure-bearing pipe 203, comparison scale 204, sealing ring 205, connecting pipe 1011, rubber pipe 1012, and steel bar 1013. Detailed implementation mode

[0042] In order to further elaborate the technical solution of the present invention, the present invention will be further described below through embodiments.

[0043] As Figures 1 to 13 shown, a grouting pipeline in a surrounding rock broken area includes a slurry outlet and pressure accumulation pipe 1 and a pressure-bearing slurry outlet pipe 2, and the slurry outlet and pressure accumulation pipe 1 is sleeved inside the pressure-bearing slurry outlet pipe 2.

[0044] The slurry outlet and pressure accumulation pipe 1 is composed of one section of expansion pressure accumulation pipe 101, multiple sections of ordinary pressure accumulation pipes 102 and one section of end pressure accumulation pipe 103 that are threadedly connected to each other. The expansion pressure accumulation pipe 101 is threadedly connected to the end of the last section of ordinary pressure accumulation pipe 102. The expansion pressure accumulation pipe 101 is used to increase the friction force with the pressure-bearing slurry outlet pipe 2 to prevent the slurry outlet and pressure accumulation pipe 1 from slipping out of the pressure-bearing slurry outlet pipe 2 during grouting. The end pressure accumulation pipe 103 is threadedly connected to the front end of the first section of ordinary pressure accumulation pipe 102. A plurality of rows of slurry outlet holes 3 are provided on the expansion pressure accumulation pipe 101, ordinary pressure accumulation pipe 102 and end pressure accumulation pipe 103, and each row of slurry outlet holes 3 has multiple holes, which are arranged in a circumferential and uniform manner. No slurry outlet holes 3 are provided in the expansion part of the expansion pressure accumulation pipe 101, and no slurry outlet holes 3 are provided in the front part of the end pressure accumulation pipe 103. The expansion pressure accumulation pipe 101 includes two connecting pipes 1011. The slurry outlet holes 3 on the expansion pressure accumulation pipe 101 are provided on the connecting pipes 1011. One of the connecting pipes 1011 is threadedly connected to the ordinary pressure accumulation pipe 102, and the end of the other connecting pipe 1011 is closed. A rubber pipe 1012 is provided between the two connecting pipes 1011, and a plurality of steel bars 1013 are evenly welded between the two connecting pipes 1011. The rubber pipe 1012 is located inside the steel bars 1013, and the rubber pipe 1012 and the steel bars 1013 form the expansion part of the expansion pressure accumulation pipe 101.

[0045] The pressure-bearing slurry outlet pipe 2 is composed of a bottom-bearing pressure pipe 201, multiple ordinary pressure pipes 202, and a head-bearing 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-bearing 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-bearing 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-bearing pressure pipe 203. The distance 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-bearing pressure pipe 203 to achieve the seal between the inner wall of the head-bearing pressure pipe 203 and the outer wall of the head pressure-accumulating pipe 103, preventing slurry leakage from the gap between the head-bearing pressure pipe 203 and the head pressure-accumulating pipe 103 during grouting. A reference scale 204 is provided at the front end of the head-bearing pressure pipe 203, and a pressure-accumulating scale 104, a slurry outlet scale 105, and a supplementary slurry scale 106 are provided at the front end of the head 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 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 staggered from 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 supplementary slurry scale 106, the slurry outlet holes 3 on the ordinary pressure-accumulating pipe 102 and the head pressure-accumulating pipe 103 are staggered from 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.

[0046] The bottom-bearing pressure pipe 201, ordinary pressure pipes 202, head-bearing pressure pipe 203, connecting pipe 1011, ordinary pressure-accumulating pipe 102, and head pressure-accumulating pipe 103 are all steel pipes.

[0047] A grouting method for a surrounding rock broken area includes the following steps:

[0048] 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-bearing pressure pipe 203 to ensure that the slurry outlet holes 3 on the bottom-bearing pressure pipe 201, ordinary pressure pipes 202, and head-bearing 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;

[0049] S2. According to the length of the on-site grouting holes, thread-connect one expansion pressure storage pipe 101, multiple ordinary pressure storage pipes 102 and one end pressure storage pipe 103 with 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, sleevethe connected slurry outlet pressure storage pipe 1 into the pressure-bearing slurry outlet pipe 2;

[0050] 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;

[0051] 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 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 an enclosed space as a whole. The slurry fills the entire slurry outlet pressure storage pipe 1, ensuring uniform distribution of the pressure inside the slurry outlet pressure storage pipe 1;

[0052] S5. When the pressure inside 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;

[0053] S6. After the preliminary grouting work is completed, rotate the slurry outlet pressure storage pipe 1 to align the supplementary slurry 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;

[0054] S7. After the grouting hole where the expansion pressure storage pipe 101 is located has completed the supplementary grouting work, remove the frontmost ordinary pressure storage pipe 102, reconnect the remaining parts, and perform the supplementary grouting work on the next position;

[0055] S8. Repeat S7 to perform supplementary grouting on each section of the entire grouting hole until the supplementary grouting work for the entire grouting hole is completed;

[0056] S9. After the supplementary grouting work is completed, take out the slurry outlet pressure storage pipe 1 for disassembly, and disassemble and withdraw the pressure-bearing slurry outlet pipe 2 section by section to complete the grouting work.

[0057] The foregoing has shown and described the main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described 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 falling within the meaning and scope of the equivalent elements of the claims in the present invention.

[0058] 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 a surrounding rock broken zone, characterized in that: It includes a slurry outlet pressure storage pipe (1) and a pressure-bearing slurry outlet pipe (2), and the slurry outlet pressure storage pipe (1) is sleeved inside the pressure-bearing slurry outlet pipe (2); The slurry outlet pressure storage pipe (1) is composed of one section of expansion pressure storage pipe (101), multiple sections of ordinary pressure storage pipes (102) and one section of 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 section of ordinary pressure storage pipe (102). The expansion pressure storage pipe (101) is used to increase the friction force with the pressure-bearing slurry outlet pipe (2) to prevent the slurry outlet pressure storage pipe (1) from slipping out of the pressure-bearing slurry outlet pipe (2) during grouting. The end pressure storage pipe (103) is threadedly connected to the front end of the first section of ordinary pressure storage pipe (102). A plurality of rows of slurry outlet holes (3) are provided on the expansion pressure storage pipe (101), the ordinary pressure storage pipe (102) and the end pressure storage pipe (103), and each row of slurry outlet holes (3) has a plurality of holes which are arranged in a circumferential and uniform manner. No slurry outlet hole (3) is provided at the expansion part of the expansion pressure storage pipe (101), and no slurry outlet hole (3) is provided at the front part of the end pressure storage pipe (103). The distance between two adjacent rows of slurry outlet holes (3) on the slurry outlet pressure storage 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; The pressure-bearing slurry outlet pipe (2) is composed of one section of bottom-supporting pressure-bearing pipe (201), multiple sections of ordinary pressure-bearing pipes (202) and one section of end pressure-bearing pipe (203) which are threadedly connected to each other. The bottom-supporting pressure-bearing pipe (201) is threadedly connected to the end of the last section of ordinary pressure-bearing pipe (202). The end pressure-bearing pipe (203) is threadedly connected to the front end of the first section of ordinary pressure-bearing pipe (202). The end of the bottom-supporting pressure-bearing pipe (201) is closed. A plurality of rows of slurry outlet holes (3) are provided on the bottom-supporting pressure-bearing pipe (201), the ordinary pressure-bearing pipe (202) and the end pressure-bearing pipe (203), and each row of slurry outlet holes (3) has a plurality of holes which are arranged in a circumferential and uniform manner. No slurry outlet hole (3) is provided at the front part of the end pressure-bearing pipe (203); The expansion pressure storage pipe (101) includes two connecting pipes (1011). The slurry outlet holes (3) on the expansion pressure storage pipe (101) are provided on the connecting pipes (1011). One of the connecting pipes (1011) is threadedly connected to the ordinary pressure storage 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 a plurality of steel bars (1013) are evenly welded between the two connecting pipes (1011). The rubber pipe (1012) is located inside the steel bars (1013), and the rubber pipe (1012) and the steel bars (1013) form the expansion part of the expansion pressure storage pipe (101); A reference scale (204) is provided at the front end of the end pressure-bearing pipe (203). A pressure accumulation scale (104), a grout discharge scale (105), and a grout replenishment scale (106) are provided at the front end of the end pressure accumulation pipe (103). When the pressure accumulation scale (104) is aligned with the reference scale (204), all the grout discharge holes (3) on the grout discharge pressure accumulation pipe (1) and the grout discharge holes (3) on the pressure-bearing grout discharge pipe (2) are arranged in a staggered manner. When the reference scale (204) is aligned with the grout discharge scale (105), the grout discharge holes (3) on the ordinary pressure accumulation pipe (102) and the end pressure accumulation pipe (103) coincide with the grout discharge holes (3) at the corresponding positions on the pressure-bearing grout discharge pipe (2), and the grout discharge holes (3) on the expansion pressure accumulation pipe (101) are staggered from the grout discharge holes (3) at the corresponding positions on the pressure-bearing grout discharge pipe (2). When the reference scale (204) is aligned with the grout replenishment scale (106), the grout discharge holes (3) on the ordinary pressure accumulation pipe (102) and the end pressure accumulation pipe (103) are staggered from the grout discharge holes (3) at the corresponding positions on the pressure-bearing grout discharge pipe (2), and the grout discharge holes (3) on the expansion pressure accumulation pipe (101) coincide with the grout discharge holes (3) at the corresponding positions on the pressure-bearing grout discharge pipe (2).

2. The grouting pipeline in the surrounding rock broken area according to claim 1, characterized in that: A sealing ring (205) is provided at the front part of the inner cavity of the end pressure-bearing pipe (203) to achieve the seal between the inner wall of the end pressure-bearing pipe (203) and the outer wall of the end pressure accumulation pipe (103), and prevent grout leakage from the gap between the end pressure-bearing pipe (203) and the end pressure accumulation pipe (103) during grouting.

3. A grouting pipeline for a surrounding rock broken zone according to claim 2, characterized in that: The bottom support pressure-bearing pipe (201), the ordinary pressure-bearing pipe (202), the end pressure-bearing pipe (203), the connecting pipe (1011), the ordinary pressure accumulation pipe (102), and the end pressure accumulation pipe (103) are all steel pipes.

4. A grouting method for a surrounding rock broken zone, adopting a grouting pipeline for a surrounding rock broken zone as described in claim 3, characterized in that: It includes the following steps: S1. According to the length of the on-site grouting hole, thread-connect one bottom support pressure-bearing pipe (201), multiple ordinary pressure-bearing pipes (202), and one end pressure-bearing pipe (203) to ensure that the grout discharge holes (3) on the bottom support pressure-bearing pipe (201), the ordinary pressure-bearing pipes (202), and the end pressure-bearing pipe (203) are aligned in each column, and place the connected pressure-bearing grout discharge pipe (2) 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 expansion pressure accumulation pipe (101), multiple ordinary pressure accumulation pipes (102), and one end pressure accumulation pipe (103) to ensure that the grout discharge holes (3) on the ordinary pressure accumulation pipes (102) and the end pressure accumulation pipe (103) are aligned in each column, and the grout discharge holes (3) on the expansion pressure accumulation pipe (101) are staggered from the grout discharge holes (3) on the ordinary pressure accumulation pipes (102) in each column, and sleeve the connected grout discharge pressure accumulation pipe (1) inside the pressure-bearing grout discharge pipe (2). S3. Rotate the grout discharge pressure accumulation pipe (1) to align the pressure accumulation scale (104) on the end pressure accumulation pipe (103) with the reference scale (204) on the end pressure-bearing pipe (203), so that all the grout discharge holes (3) on the grout discharge pressure accumulation pipe (1) and the grout discharge holes (3) on the pressure-bearing grout discharge pipe (2) are arranged in a staggered manner. S4. Connect the front end of the end pressure accumulation pipe (103) to the grouting pump through a pipeline, open the grouting pump, and inject the slurry into the slurry outlet pressure accumulation pipe (1) for pressure accumulation. At this time, all the slurry outlet holes (3) on the slurry outlet pressure accumulation pipe (1) are misaligned with the slurry outlet holes (3) on the pressure-bearing slurry outlet pipe (2), forming a closed space as a whole. The slurry fills the entire slurry outlet pressure accumulation pipe (1) to ensure uniform distribution of the pressure inside the slurry outlet pressure accumulation pipe (1). S5. When the pressure in the slurry outlet pressure accumulation pipe (1) reaches the set value, rotate the slurry outlet pressure accumulation pipe (1) to align the slurry outlet scale (105) on the end pressure accumulation pipe (103) with the reference scale (204) on the end pressure-bearing pipe (203). At this time, the slurry outlet holes (3) on the ordinary pressure accumulation pipe (102) and the end pressure accumulation 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 accumulation pipe (101) are misaligned with the slurry outlet holes (3) at the corresponding positions on the pressure-bearing slurry outlet pipe (2), and the initial grouting work starts. S6. After the initial grouting work is completed, rotate the slurry outlet pressure accumulation pipe (1) to align the supplementary grouting scale (106) on the end pressure accumulation pipe (103) with the reference scale (204) on the end pressure-bearing pipe (203). At this time, the slurry outlet holes (3) on the ordinary pressure accumulation pipe (102) and the end pressure accumulation pipe (103) are misaligned 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 accumulation pipe (101) coincide with the slurry outlet holes (3) at the corresponding positions on the pressure-bearing slurry outlet pipe (2), and the supplementary grouting work starts. S7. After the grouting hole at the position where the expansion pressure accumulation pipe (101) is located has completed the supplementary grouting work, remove the outermost ordinary pressure accumulation pipe (102), reconnect the remaining parts, and perform the supplementary grouting work on the next position. S8. Repeat S7 to perform supplementary grouting on 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 accumulation pipe (1) for disassembly, and gradually disassemble and withdraw the pressure-bearing slurry outlet pipe (2) to complete the grouting work.

Images