A device for long and large pipe shed sectional grouting process and a construction method thereof

Abstract

The present application belongs to the technical field of tunnel and underground space pipe shed construction, and particularly relates to a device for long and large pipe shed sectional grouting process and a construction method thereof, which solves the problem that grouting slurry cannot reinforce the whole section of surrounding rock at one time when the existing grouting device and construction method are used for grouting long and large pipe sheds, resulting in that the grouting effect of some parts is not ideal, there are engineering safety hazards, and even serious safety accidents such as tunnel collapse are caused. The special feature of the device is that it comprises a pipe shed; the pipe shed is tubular with a closed front end and an open rear end, and the closed front end is a sharp cone; a front slurry outlet area is arranged on the pipe wall of the pipe shed at a position 1m-3m away from the front end of the pipe shed; one or more middle sectional slurry outlet areas containing multiple second slurry outlet holes are arranged on the pipe wall of the pipe shed rearward of the front slurry outlet area, and temporary sealing iron sheets are arranged on the second slurry outlet holes; the pipe shed is used in combination with a water bag type grouting plug to complete the sectional grouting process.

Description

Technical Field

[0001] This invention belongs to the field of tunnel and underground space pipe roof construction technology, and specifically relates to a device and construction method for segmented grouting process of long pipe roofs. Background Technology

[0002] In the field of tunnel and underground space engineering, such as railway and highway tunnel entrances and exits, soft soil reinforcement, and ultra-large underground spaces, it is often necessary to carry out preliminary support before tunneling. Long pipe roofs are one of the most important support methods, which can effectively ensure the stability of the surrounding rock, reduce the shrinkage of the surrounding rock, and ensure the safety of the project.

[0003] However, for long pipe sheds exceeding 30 meters in length, the existing grouting devices and construction methods cannot reinforce the entire surrounding rock area at once, resulting in unsatisfactory grouting effects in some areas, failing to meet design requirements, posing engineering safety hazards, and even causing serious safety accidents such as tunnel collapses. Summary of the Invention

[0004] The purpose of this invention is to provide an apparatus and its construction method for segmented grouting process of long pipe sheds, in order to solve the technical problem that when using existing grouting devices and construction methods to grout long pipe sheds, the grouting slurry cannot reinforce the entire surrounding rock range at one time, resulting in unsatisfactory grouting effects in some parts, failing to meet design requirements, posing engineering safety hazards, or even causing serious safety accidents such as tunnel collapse.

[0005] The technical solution adopted in this invention is a device for segmented grouting process of long pipe sheds, which is special in that:

[0006] Including pipe sheds;

[0007] The tube shed is a tube that is closed at the front end and open at the rear end, and the closed end at the front end is conical.

[0008] On the pipe wall of the pipe shed, at a position 1m to 3m from the front end of the pipe shed, a front slurry outlet area containing multiple first slurry outlet holes is provided;

[0009] On the pipe wall of the pipe shed behind the front slurry outlet area, one or more intermediate slurry outlet areas containing multiple second slurry outlet holes are provided at intervals, and temporary sealing iron plates are provided on the second slurry outlet holes. The function of the temporary sealing iron plate is to act as a check valve when slurry is discharged from the first slurry outlet hole of the front slurry outlet area, or when slurry is discharged from the second slurry outlet hole of another intermediate slurry outlet area adjacent to the intermediate slurry outlet area where the temporary sealing iron plate is located, to prevent slurry from flowing into the pipe shed from the second slurry outlet hole in the intermediate slurry outlet area where the temporary sealing iron plate is located. When grouting is performed on the intermediate slurry outlet area where the temporary sealing iron plate is located, the temporary sealing iron plate can be opened under the action of grouting pressure, and the slurry can flow out from the second slurry outlet hole in the intermediate slurry outlet area where the temporary sealing iron plate is located.

[0010] The pipe roof is used in conjunction with the water-filled grout stopper to complete the segmented grouting process of the pipe roof; the inner diameter of the pipe roof is adapted to the outer diameter of the water-filled grout stopper; the axial length of the grout outlet area in the middle section of the pipe roof is smaller than the length of the water-filled grout stopper; the water-filled grout stopper is set in the middle section grout outlet area inside the pipe roof cavity, and is used to stop the grouting of the middle section grout outlet area adjacent to the grouting area when grouting the front grout outlet area or the middle section grout outlet area located in front.

[0011] Furthermore, the second slurry outlet is a stepped hole, and the larger end of the stepped hole is located on one side of the outer surface of the pipe roof wall;

[0012] The radial dimension of the temporary sealing iron sheet is adapted to the inner diameter of the large end of the stepped hole. The temporary sealing iron sheet is disposed inside the inner diameter of the large end of the stepped hole, and the thickness of the temporary sealing iron sheet is less than or equal to the depth of the inner diameter of the large end of the stepped hole.

[0013] This design ensures that the temporary sealing sheet will not fall off due to scratches during pipe roof installation, thus providing a temporary seal.

[0014] Furthermore, in each of the aforementioned mid-section slurry outlet areas, multiple rows of second slurry outlet holes are evenly distributed along the circumference of the pipe wall. Each row is arranged in a linear array along the axial direction of the pipe roof, and the second slurry outlet holes in adjacent rows are staggered, so that the multiple second slurry outlet holes are arranged in a quincunx pattern.

[0015] The spacing between adjacent second slurry outlet holes is 10cm to 20cm. The inner diameter of the larger end of the second slurry outlet hole is 7.5mm to 8.5mm, and the inner diameter of the smaller end is 4.5mm to 5.5mm. The depth of the inner hole at the larger end is less than or equal to one-third of the wall thickness of the pipe roof.

[0016] This setup ensures the correct number of holes. Too many holes will not weaken the pipe roof's strength excessively, resulting in insufficient pipe roof strength; nor will too few holes lead to some holes becoming clogged with grout, causing poor grout discharge.

[0017] Furthermore, in order to facilitate control over the reliability of the temporary sealing iron sheet being fixed to the inner hole of the large end of the stepped hole, so that the temporary sealing iron sheet can not only play the role of temporary sealing, but also be reliably opened under the action of grouting pressure, the temporary sealing iron sheet is spot-welded or pasted into the inner hole of the large end of the stepped hole.

[0018] Furthermore, for ease of procurement and to keep costs low, the length of the water-filled grout stopper is 1m to 1.5m; the water-filled grout stopper uses the principle of rubber expansion under water pressure to achieve a sealing and grout-stopping effect.

[0019] Furthermore, the grouting pressure is 0.1 MPa to 3 MPa.

[0020] Furthermore, in order to ensure an appropriate number of holes, multiple rows of first slurry outlet holes are evenly distributed along the circumference of the pipe wall in the front end slurry outlet area. Each row is arranged in a linear array along the axial direction of the pipe roof, and the first slurry outlet holes in adjacent rows are staggered, so that the multiple first slurry outlet holes are arranged in a quincunx pattern.

[0021] The spacing between adjacent first discharge holes is 20cm to 30cm. The first discharge hole is a circular through hole with a diameter of 5mm to 10mm.

[0022] Meanwhile, the present invention also provides a construction method for segmented grouting technology of long pipe sheds, which is characterized in that: the method is based on the above-mentioned device for segmented grouting technology of long pipe sheds, and the method includes the following steps:

[0023] Step 1: Drill holes for the pipe roof;

[0024] Step 2: Install the pipe roof in the device for segmented grouting process of long pipe roof as described in any one of claims 1 to 7 into the pipe roof hole drilled in step 1.

[0025] Step 3: Place a matching water-filled slurry stop plug at the mid-section slurry outlet area adjacent to the front slurry outlet area, and press water to make it expand to achieve the function of segmented slurry stop.

[0026] Step 4: Start grouting. The grout flows from the front grouting area to the gap between the pipe roof and the pipe roof hole and into the surrounding rock strata until the design pressure and grouting volume are reached, then stop grouting.

[0027] Step 5: Remove the water pressure from the water-filled grout stopper mentioned in Step 3; then retract the water-filled grout stopper to the adjacent intermediate grout outlet area. When there is no intermediate grout outlet area behind it, retract the water-filled grout stopper to the pipe roof opening; then re-press water into the water-filled grout stopper to make it expand and achieve the grout stopper function.

[0028] Step Six: Grouting again. Under the grouting pressure, the grout washes away the temporary sealing iron plate on the second grout outlet in the middle section grout outlet area adjacent to the water-filled grout stop plug. Grout then flows out from the second grout outlet and into the gap between the pipe roof and the pipe roof hole and into the surrounding rock stratum. Grouting stops when the design pressure and grouting volume are reached. At this time, if the water-filled grout stop plug is located at the pipe roof opening, the construction of the entire long pipe roof sectional grouting process is completed. Otherwise, repeat steps five and six until the water-filled grout stop plug is located at the pipe roof opening and the re-grouting is completed. The construction of the entire long pipe roof sectional grouting process is then completed.

[0029] Furthermore, in step four, the slurry flows from the front slurry outlet area to the gap between the pipe roof and the pipe roof hole and into the surrounding rock strata, reinforcing the front and middle sections of the pipe roof hole outside the pipe roof or the middle and rear sections of the pipe roof hole.

[0030] Furthermore, in step six, when the slurry flows out from the second slurry outlet in the middle section slurry outlet area, the reinforcement is applied to the middle and rear section of the pipe roof hole outside the pipe roof, or after the middle and rear section of the pipe roof hole has been reinforced and compacted, the reinforcement is applied to the front end section of the pipe roof hole.

[0031] The beneficial effects of this invention are:

[0032] (1) In the device for segmented grouting process of long pipe sheds of the present invention, a front grouting area containing multiple first grouting holes is provided on the pipe wall of the pipe shed at a position 1m to 3m away from the front end of the pipe shed; on the pipe wall of the pipe shed behind the front grouting area, one or more middle segmented grouting areas containing multiple second grouting holes are provided at intervals, and temporary sealing iron plates are provided on the second grouting holes; when grouting is performed on the front grouting area or the middle segmented grouting area adjacent to the middle segmented grouting area where the temporary sealing iron plate is located, the temporary sealing iron plate acts as a check valve, and when grouting is performed on the middle segmented grouting area where the temporary sealing iron plate is located, the temporary sealing iron plate can be flushed out under the action of grouting pressure. The grout flows from the second grout outlet in the middle section grout outlet area where the temporary sealing iron plate is located into the gap between the pipe roof and the pipe roof hole and into the surrounding rock stratum. The pipe roof in this invention is used in conjunction with the water-filled grout stop plug, which can perform segmented grouting on long pipe roofs. This avoids the problem that when using existing grouting devices and construction methods, the grout cannot reinforce the entire section of surrounding rock at once, resulting in unsatisfactory grouting effects in some parts. Therefore, this invention solves the technical problem that when using existing grouting devices and construction methods to grout long pipe roofs, the grout cannot reinforce the entire section of surrounding rock at once, resulting in unsatisfactory grouting effects in some parts, failing to meet design requirements, posing engineering safety hazards, and even causing serious tunnel collapses and other safety accidents.

[0033] (2) The present invention divides the long pipe shed into one or several sections for grouting, and grouts in sequence to make the grouting more uniform and the stratum reinforcement more compact.

[0034] (3) In this invention, the second grout outlet is preferably a stepped hole, and the temporary sealing iron sheet is set in the inner hole of the large end of the stepped hole. The thickness of the temporary sealing iron sheet is less than or equal to the depth of the inner hole of the large end of the stepped hole. In this way, the temporary sealing iron sheet will not be scraped off during the pipe roof installation process, and it will play a role in stopping the grouting when grouting at the front end. The grout will not flow into the pipe roof in the un-grouted area, thus achieving the effect of segmented grouting process.

[0035] (4) The flange grouting measure is eliminated in this invention. The water-filled grouting plug can quickly stop grouting and water, which improves construction efficiency. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of an embodiment of the device for segmented grouting process of long pipe sheds according to the present invention;

[0037] Figure 2 This is a schematic diagram of the structure of the second grout outlet in an embodiment of the device for segmented grouting process of long pipe sheds according to the present invention.

[0038] The labels in the diagram are explained as follows:

[0039] 1-Pipe roof, 2-Front end slurry outlet area, 3-Middle section slurry outlet area, 4-Temporary sealing iron sheet, 5-Water-filled slurry stop plug, 6-First slurry outlet hole, 7-Second slurry outlet hole. Detailed Implementation

[0040] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0041] See Figure 1 and Figure 2 The present invention provides an apparatus for segmented grouting process of long pipe sheds, comprising a pipe shed 1.

[0042] The aforementioned pipe shed 1 is a tube-shaped structure with a closed front end and an open rear end, and the closed front end is conical. On the pipe wall of the aforementioned pipe shed 1, at a position 1m to 3m from the front end, a front slurry outlet area 2 containing multiple first slurry outlet holes 6 is provided. On the pipe wall of the pipe shed 1 behind the aforementioned front slurry outlet area 2, one or more intermediate segmented slurry outlet areas 3 containing multiple second slurry outlet holes 7 are provided at intervals, and temporary sealing iron plates 4 are provided on the second slurry outlet holes 7. The function of the temporary sealing iron plate 4 is to act as a check valve when slurry exits from the first slurry outlet hole 6 of the front slurry outlet area 2, or when slurry exits from the second slurry outlet hole 7 of another intermediate segmented slurry outlet area adjacent to the intermediate segmented slurry outlet area where the temporary sealing iron plate 4 is located, preventing slurry from exiting from the intermediate segmented slurry outlet area where the temporary sealing iron plate 4 is located. The second grout outlet 7 inside the pipe roof 1 flows into the pipe roof 1, and when grouting is applied to the middle section grout outlet area where the temporary sealing iron plate 4 is located, the temporary sealing iron plate 4 can be opened under the grouting pressure, and the grout flows out from the second grout outlet 7 in the middle section grout outlet area where the temporary sealing iron plate 4 is located; the pipe roof 1 is used in conjunction with the water-filled grout stop plug 5 to complete the segmented grouting process of the pipe roof 1; the inner diameter of the pipe roof 1 is adapted to the outer diameter of the water-filled grout stop plug 5; the axial length of the middle section grout outlet area 3 on the pipe roof 1 is smaller than the length of the water-filled grout stop plug 5; the water-filled grout stop plug 5 is set in the middle section grout outlet area 3 inside the pipe roof 1, and is used to stop the grouting of the rear middle section grout outlet area adjacent to the grouting area when grouting the front grout outlet area 2 or the middle section grout outlet area located in front.

[0043] See Figure 1 Within the aforementioned front-end slurry outlet area 2, multiple rows of first slurry outlet holes 6 are evenly distributed along the circumference of the pipe wall 1. Each row is arranged linearly along the axial direction of the pipe wall 1, with the first slurry outlet holes 6 in adjacent rows staggered to form a quincunx arrangement. The spacing between adjacent first slurry outlet holes 6 is 20cm to 30cm. Each first slurry outlet hole 6 is a circular through hole with a diameter of 5mm to 10mm. This arrangement results in a suitable number of first slurry outlet holes.

[0044] See Figure 1 In this embodiment, preferably, within each of the aforementioned mid-section slurry outlet areas 3, multiple rows of second slurry outlet holes 7 are evenly distributed along the circumference of the pipe roof 1. Each row is arranged linearly along the axial direction of the pipe roof 1, with adjacent rows of second slurry outlet holes 7 staggered to form a quincunx arrangement. The spacing between adjacent second slurry outlet holes 7 is 10cm to 20cm. The inner diameter of the larger end of the second slurry outlet hole 7 is 7.5mm to 8.5mm, and the inner diameter of the smaller end is 4.5mm to 5.5mm. The depth of the inner hole at the larger end is less than or equal to one-third of the wall thickness of the pipe roof 1. This arrangement ensures a suitable number of holes. Too many holes will not weaken the strength of the pipe roof excessively, resulting in insufficient pipe roof strength; nor will too few holes lead to poor slurry outlet performance due to blockage of individual holes by slurry.

[0045] See Figure 2 In this embodiment, the second grout outlet 7 is preferably a stepped hole, with the larger end of the stepped hole located on the outer surface of the pipe wall of the pipe roof 1. The radial dimension of the temporary sealing iron sheet 4 is adapted to the inner diameter of the larger end of the stepped hole. The temporary sealing iron sheet 4 is disposed inside the inner diameter of the larger end of the stepped hole, and the thickness of the temporary sealing iron sheet 4 is less than or equal to the depth of the inner diameter of the larger end of the stepped hole. This configuration prevents the temporary sealing iron sheet from being scraped off during pipe roof installation and acts as a grout stopper during front-end grouting, preventing grout from flowing into the un-grouted area of ​​the pipe roof, thus achieving the effect of segmented grouting. To facilitate control over the firmness of the temporary sealing iron sheet's fixation to the inner diameter of the larger end of the stepped hole, ensuring that the temporary sealing iron sheet can both provide a temporary seal and be reliably opened under grouting pressure, the temporary sealing iron sheet 4 is preferably spot-welded or pasted into the inner diameter of the larger end of the stepped hole. In this embodiment, the temporary sealing iron sheet 4 is pasted into the inner diameter of the larger end of the stepped hole with adhesive. In this embodiment, the grouting pressure is 0.1 MPa to 3 MPa.

[0046] See Figure 1 To facilitate procurement and reduce costs, the length of the water-filled slurry stopper 5 is 1m to 1.5m. The water-filled slurry stopper 5 uses the principle of rubber pressure water expansion to achieve the sealing and slurry stopping effect.

[0047] Meanwhile, the present invention also provides a construction method for segmented grouting process of long pipe sheds. This method is based on the above-mentioned device for segmented grouting process of long pipe sheds and includes the following steps:

[0048] Step 1: Drill holes for the pipe roof;

[0049] Step 2: Install the pipe roof 1 in the above-mentioned device for segmented grouting process of long pipe roof into the pipe roof hole drilled in Step 1.

[0050] Step 3: Place the matching water-filled slurry stop plug 5 in the middle section slurry outlet area adjacent to the front slurry outlet area 2, and press water to make it expand to achieve the function of slurry stop in sections.

[0051] Step 4: Start grouting. The grout flows from the front grouting area 2 to the gap between the pipe roof 1 and the pipe roof hole and into the surrounding rock stratum until the design pressure and grouting volume are reached and then grouting is stopped.

[0052] Step 5: Remove the water pressure from the water-filled grout stop plug 5 mentioned in Step 3; then retract the water-filled grout stop plug 5 to the adjacent intermediate grout outlet area. When there is no intermediate grout outlet area behind it, retract the water-filled grout stop plug 5 to the pipe opening of the pipe roof 1; then re-press water into the water-filled grout stop plug 5 to make it expand and achieve the grout stop function in sections.

[0053] Step Six: Grouting again. Under the grouting pressure, the grout washes away the temporary sealing iron plate 4 on the second grout outlet 7 located in the middle section grout outlet area adjacent to the water-filled grout stop plug 5. The grout flows out from the second grout outlet 7 and flows into the gap between the pipe roof 1 and the pipe roof hole and into the surrounding rock stratum. Grouting stops after the design pressure and grouting volume are reached. At this time, if the water-filled grout stop plug 5 is located at the pipe opening of the pipe roof 1, the construction of the entire long pipe roof segmented grouting process is completed. Otherwise, repeat steps five and six until the water-filled grout stop plug 5 is located at the pipe opening of the pipe roof 1 and the above-mentioned grouting is completed. The construction of the entire long pipe roof segmented grouting process is completed.

[0054] In step four above, the grout flows from the front grout outlet area 2 to the gap between the pipe roof 1 and the pipe roof hole and into the surrounding rock strata, reinforcing the front-middle section of the pipe roof hole outside the pipe roof 1 or the middle-rear section of the pipe roof hole. In step six above, when the grout flows out from the second grout outlet 7 on the middle section grout outlet area, it reinforces the middle-rear section of the pipe roof hole outside the pipe roof 1, or after the middle-rear section of the pipe roof hole has been reinforced and compacted, it reinforces the front end area of ​​the pipe roof hole.

[0055] This invention divides the long pipe shed into one or several sections for segmented grouting, and grouts in sequence to make the grouting more uniform and the ground reinforcement more compact. In addition, this invention eliminates the flange grouting stop measure and uses a water-filled grouting stop plug to quickly stop grouting and water, thereby improving construction efficiency.

Claims

1. An apparatus for segmented grouting process in long pipe sheds, characterized in that: Including pipe shed (1); The tube shed (1) is a tube with a closed front end and an open rear end, and the closed front end is a pointed cone shape; On the pipe wall of the pipe shed (1), at a position 1m to 3m away from the front end of the pipe shed (1), a front slurry outlet area (2) containing multiple first slurry outlet holes (6) is provided. On the pipe wall of the pipe shed (1) behind the front slurry outlet area (2), one or more intermediate segmented slurry outlet areas (3) containing multiple second slurry outlet holes (7) are provided at intervals, and temporary sealing iron plates (4) are provided on the second slurry outlet holes (7); the function of the temporary sealing iron plate (4) is to provide temporary sealing iron plates (4) when slurry is discharged from the first slurry outlet hole (6) of the front slurry outlet area (2), or when slurry is discharged from another outlet adjacent to the intermediate segmented slurry outlet area where the temporary sealing iron plate (4) is located. When slurry is discharged from the second slurry outlet (7) in the segmented slurry outlet area, it acts as a check valve to prevent slurry from flowing into the pipe roof (1) from the second slurry outlet (7) in the segmented slurry outlet area where the temporary sealing iron plate (4) is located. When grouting is applied to the segmented slurry outlet area where the temporary sealing iron plate (4) is located, the temporary sealing iron plate (4) can be opened under the grouting pressure, and the slurry flows out from the second slurry outlet (7) in the segmented slurry outlet area where the temporary sealing iron plate (4) is located. The pipe roof (1) is used in conjunction with the water-filled grout stopper (5) to complete the segmented grouting process of the pipe roof (1); the inner diameter of the pipe roof (1) is compatible with the outer diameter of the water-filled grout stopper (5); the axial length of the middle segmented grout outlet area (3) of the pipe roof (1) is smaller than the length of the water-filled grout stopper (5); the water-filled grout stopper (5) is set in the middle segmented grout outlet area (3) inside the pipe roof (1) and is used to stop the grouting of the middle segmented grout outlet area adjacent to the grouting area when grouting the front grout outlet area (2) or the middle segmented grout outlet area located in front; The second slurry outlet (7) is a stepped hole, and the larger end of the stepped hole is located on one side of the outer surface of the pipe wall of the pipe roof (1); The radial dimension of the temporary sealing iron sheet (4) is adapted to the inner diameter of the large end of the stepped hole. The temporary sealing iron sheet (4) is disposed in the inner diameter of the large end of the stepped hole, and the thickness of the temporary sealing iron sheet (4) is less than or equal to the depth of the inner diameter of the large end of the stepped hole.

2. The apparatus for segmented grouting process of long pipe sheds according to claim 1, characterized in that: In each of the mid-section slurry outlet areas (3), multiple rows of second slurry outlet holes (7) are evenly distributed along the circumference of the pipe wall of the pipe roof (1). Each row is arranged in a linear array along the axial direction of the pipe roof (1), and the second slurry outlet holes (7) between adjacent rows are staggered, so that the multiple second slurry outlet holes (7) are arranged in a plum blossom pattern. The spacing between adjacent second slurry outlet holes (7) is 10cm~20cm. The inner diameter of the large end of the second slurry outlet hole (7) is 7.5mm~8.5mm, the inner diameter of the small end is 4.5mm~5.5mm, and the depth of the inner hole at the large end is less than or equal to one-third of the wall thickness of the pipe roof (1).

3. The apparatus for segmented grouting process of long pipe sheds according to claim 2, characterized in that: The temporary sealing iron sheet (4) is spot-welded or pasted into the inner hole of the large end of the stepped hole.

4. The apparatus for segmented grouting process of long pipe sheds according to claim 1, characterized in that: The length of the water-filled grout stopper (5) is 1m to 1.5m; the water-filled grout stopper (5) uses the principle of rubber pressure water expansion to achieve the sealing and grout-stopping effect.

5. The apparatus for segmented grouting process of long pipe sheds according to claim 1, characterized in that: The grouting pressure is 0.1 MPa to 3 MPa.

6. The apparatus for segmented grouting process of long pipe sheds according to claim 1, characterized in that: In the front end slurry outlet area (2), multiple rows of first slurry outlet holes (6) are evenly distributed along the circumference of the pipe wall of the pipe roof (1). Each row is arranged in a linear array along the axial direction of the pipe roof (1), and the first slurry outlet holes (6) between adjacent rows are staggered, so that the multiple first slurry outlet holes (6) are arranged in a plum blossom pattern. The spacing between adjacent first discharge holes (6) is 20cm~30cm. The first discharge hole (6) is a circular through hole with a diameter of 5mm~10mm.

7. A construction method for segmented grouting technology in long pipe sheds, characterized in that: This method is based on the apparatus for segmented grouting process of long pipe sheds as described in any one of claims 1 to 6, and the method includes the following steps: Step 1: Drill holes for the pipe roof; Step 2: Install the pipe roof (1) in the device for segmented grouting process of long pipe roof as described in any one of claims 1 to 6 into the pipe roof hole drilled in step 1; Step 3: Place a matching water-filled slurry stop plug (5) in the middle section slurry outlet area adjacent to the front slurry outlet area (2), and press water to make it expand to achieve the function of slurry stop in sections; Step 4: Start grouting. The grout flows from the front grouting area (2) to the gap between the pipe roof (1) and the pipe roof hole and into the surrounding rock stratum until the design pressure and grouting volume are reached and then grouting is stopped. Step 5: Remove the water pressure of the water-filled grout stop plug (5) mentioned in Step 3; then move the water-filled grout stop plug (5) back to the adjacent middle section grout outlet area. When there is no middle section grout outlet area behind, move the water-filled grout stop plug (5) back to the pipe opening of the pipe roof (1); then press water into the water-filled grout stop plug (5) again to make it expand and achieve the grout stop function. Step Six: Grouting again. Under the action of grouting pressure, the grout will wash away the temporary sealing iron plate (4) set on the second grout outlet (7) in the middle section grout outlet area adjacent to the water-bag type grout stop plug (5), and the grout will flow out from the second grout outlet (7). The grout will flow into the gap between the pipe roof (1) and the pipe roof hole and into the surrounding rock stratum. Grouting will stop after the design pressure and grouting volume are reached. At this time, if the water-bag type grout stop plug (5) is located at the pipe opening of the pipe roof (1), the construction of the entire long pipe roof segmented grouting process is completed. Otherwise, repeat steps five and six until the water-bag type grout stop plug (5) is located at the pipe opening of the pipe roof (1) and the grouting again is completed. The construction of the entire long pipe roof segmented grouting process is completed.

8. The construction method for segmented grouting process of long pipe sheds according to claim 7, characterized in that: In step four, the slurry flows from the front slurry outlet area (2) to the gap between the pipe roof (1) and the pipe roof hole and the surrounding rock stratum. The reinforcement is the front and middle section of the pipe roof hole outside the pipe roof (1) or the middle and rear section of the pipe roof hole.

9. The construction method for segmented grouting process of long pipe sheds according to claim 8, characterized in that: In step six, when the slurry flows out from the second slurry outlet (7) in the middle section slurry outlet area, the middle and rear section area of ​​the pipe roof (1) is reinforced, or after the middle and rear section area of ​​the pipe roof has been reinforced and compacted, the front end area of ​​the pipe roof is reinforced.

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