A sleeve valve pipe for a shield tunnel passing through a railway throat area and its tracking grouting method

Abstract

The present invention discloses a sleeve valve pipe in a throat area of ​​a shield tunnel passing under a railway and a tracking grouting method thereof, comprising the steps of Step 1. First, before construction, according to the design drawings and on-site conditions, the sleeve valve pipe grouting points are accurately laid out on both sides of a pedestrian passage above the construction tunnel passing under the railway, and are marked; Step 2. After determining the coordinates of the grouting points in the pedestrian passage, sleeve valve pipe grouting holes are drilled at the points, and the sleeve valve pipe is installed after the drilling of the sleeve valve pipe grouting holes is completed; Step 3. After the sleeve valve pipe is installed, a grouting machine is installed to carry out grouting; this method uses the existing pedestrian passage to lay sleeve valve pipes, and simultaneously performs tracking grouting during shield construction to supplement stratum loss, thereby effectively tracking the grouting process, and simultaneously preventing throat area track settlement by supplementing stratum loss, and has the characteristics of good grouting tracking effect and timely stratum pressure replenishment.

Description

Technical Field

[0001] The invention relates to the technical field of grouting and solidification construction, and in particular to a sleeve valve pipe in a shield tunnel passing under a railway throat area and a tracking grouting method thereof. Background Art

[0002] With the rapid development of the economy and society, the number of tunnel construction projects in my country has continued to increase. In the section where shield tunnels pass under railways, there are operating railways and existing underground pedestrian passages above the tunnels. To ensure the stability of the shield tunnel itself and the upper operating railway during shield construction and to ensure smooth shield tunneling, it is necessary to take certain reinforcement measures on the shield tunnel surrounding and nearby structures before or during shield construction. In the process of reinforcing the above structures, sleeve valve pipes are usually used for construction. However, when using sleeve valve pipes for construction, the following problems still exist:

[0003] (1) Since the slurry diffusion during the grouting process cannot be accurately controlled, the overall grouting process is difficult to control;

[0004] (2) At the same time, the grouting pressure required for construction will generate excess pore water pressure on the foundation, resulting in a significant soil squeezing effect, which may undermine the stability of the foundation and the safety of adjacent structures, thereby creating the risk of track settlement due to shield tunneling under the railway throat area;

[0005] (3) The deformation of the grouting position cannot be monitored effectively and timely during the grouting process, and effective tracking cannot be achieved, resulting in insufficient grouting or oversaturated grouting, which in turn makes the grouting effect unguaranteed;

[0006] (4) The existing sleeve valve tube is difficult to position during use. It is difficult to accurately position the grouting position in the sleeve valve tube grouting hole, which affects its grouting effect. It is also impossible to achieve grouting at different grouting positions with different spacings. The use process is monotonous and old-fashioned.

[0007] Therefore, in order to solve the defects of the above-mentioned prior art, the present invention proposes a sleeve valve pipe for a shield tunnel passing through a railway throat area and a tracking grouting method thereof. Summary of the Invention

[0008] In response to the above-mentioned problems, the present invention aims to provide a sleeve valve pipe and a tracking grouting method for a shield tunnel passing through a railway throat area. This method utilizes the existing pedestrian passage to set up a sleeve valve pipe, and simultaneously performs tracking grouting during shield construction to supplement stratum loss. It can effectively track the grouting process, and at the same time, by supplementing stratum loss, it can effectively prevent the throat area track from sinking. It has the characteristics of good grouting tracking effect and timely stratum pressure replenishment.

[0009] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0010] A sleeve valve pipe tracking grouting method for a shield tunnel passing through a railway throat area comprises the following steps:

[0011] Step 1. Before construction, based on the design drawings and site conditions, accurately lay out and mark the sleeve valve pipe grouting points on both sides of the pedestrian walkway above the underpass under the railway construction tunnel;

[0012] Step 2. After determining the coordinates of the grouting points within the pedestrian walkway, drill holes for the sleeve valve pipe grouting at those points. After drilling the holes, install the sleeve valve pipe.

[0013] Step 3. After the sleeve valve pipe is installed, install the grouting machine for grouting.

[0014] Preferably, the sleeve valve pipe grouting connection hole drilling process described in Step 2 includes:

[0015] Step 201. Before drilling, use a Φ120 water-grinding drill to open the hole. The hole depth should be equal to the thickness of the pedestrian walkway frame.

[0016] The drilling process uses an HLZ-70 fully hydraulic crawler drilling machine with a maximum drilling diameter of 230 mm, a maximum drilling depth of 100 m, a mast stroke of 500 mm, and a power head stroke of 1100 mm. It can achieve inclined hole construction and the hole diameter is Φ108 mm.

[0017] Step 202. After the opening on the walkway frame is completed, extend the opening and drill the sleeve valve pipe hole;

[0018] Step 203. After the sleeve valve tube is drilled, install the sleeve valve tube into the sleeve valve tube hole.

[0019] Preferably, the grouting machine described in step 3 is a HJB-6 grouting machine, and its main technical parameters are: external dimensions 1250×430×850 mm, slurry discharge volume 6m 3 / h, the maximum rated pressure is 1.5-3 MPa, the inner diameter of the slurry inlet pipe is 51mm, and the inner diameter of the slurry outlet pipe is 38mm; the maximum conveying distance is 80m vertically and 300m horizontally.

[0020] Preferably, the slurry applied in step 3 is cement slurry, the water-cement ratio of the cement slurry is 1:1, and the grouting pressure during the grouting process is 0.5~0.8Mpa;

[0021] The grouting end standard is: the grouting pressure is gradually increased, and when it reaches the set final pressure and continues grouting for more than 10 minutes, there is a certain grouting volume, and the grouting volume at the end of grouting reaches more than 80% of the design volume.

[0022] A sleeve valve pipe is provided for a shield tunnel passing under a railway throat area. The sleeve valve pipe tracking grouting method for the shield tunnel passing under a railway throat area is performed based on the sleeve valve pipe. The sleeve valve pipe includes an outer sleeve and a grouting sleeve. The outer sleeve is arranged in a grouting connection hole of the sleeve valve pipe. The grouting sleeve is arranged in the outer sleeve, and a grouting mechanism is provided in the grouting sleeve. The grouting mechanism is connected to a grouting machine through a grouting pipe.

[0023] Preferably, the outer casing includes a first section casing, a multi-section standard section casing and a last section casing, and the first section casing, the standard section casing and the last section casing are connected by a waterproof threaded kit, and the first section casing is arranged at the bottom of the sleeve valve tube grouting connection hole, and the last section casing is arranged at the port part of the sleeve valve tube grouting connection hole; and positioning holes, grouting holes, external limiting threads and connecting thread columns are provided on the first section casing, the multi-section standard section casing and the last section casing, and the connecting thread columns are used in conjunction with the waterproof threaded kit, and a waterproof ring is also embedded in the middle of the waterproof threaded kit; the front end of the first section casing is also integrally provided with a conical head for use in conjunction with the sleeve valve tube grouting connection hole.

[0024] Preferably, the grouting mechanism includes a positioning rod, which is threadedly connected to the grouting pipe, and a positioning rod positioning assembly, a grouting assembly and an outer sleeve positioning assembly are provided on the positioning rod; wherein, the positioning rod positioning assembly is symmetrically arranged at both ends of the outer sleeve positioning assembly, and the outer sleeve positioning assembly is symmetrically arranged at both ends of the grouting assembly, and the grouting assembly is used in conjunction with the positioning rod positioning assembly and the outer sleeve positioning assembly; and a grouting groove is also provided in the positioning rod, and the grouting groove is used in conjunction with the grouting pipe, and a plurality of slurry outlet holes are provided on the positioning rod, and the slurry outlet holes are connected to the grouting groove.

[0025] Preferably, the grouting assembly is arranged in the middle of the positioning rod, including a one-way closing valve plate and a grouting branch pipe. The one-way closing valve plate is movably installed on the outside of the grouting sleeve, and the guide grouting blades at both ends are used in conjunction with the grouting holes. The grouting branch pipe is symmetrically arranged on both sides of the one-way closing valve plate and is used in conjunction with the outer sleeve positioning assembly. Sealing plates are also provided at both ends of the one-way closing valve plate, and the sealing plates are used in conjunction with the side holes of the grouting sleeve. A gourd section is provided in the middle of the positioning rod, and the slurry outlet is provided on the gourd section.

[0026] Preferably, the positioning rod positioning assembly includes several first positioning kits and second positioning kits, the first positioning kit and the second positioning kit are both conical sleeves movably mounted on the positioning rod, wherein the second positioning kit is movably mounted on the positioning rod on one side close to the grouting assembly, the first positioning kit is movably mounted on the small head end of the second positioning kit, and the small head end of the first positioning kit is used in conjunction with the positioning plate provided on the positioning rod; and a trapezoidal clearance notch is provided on the first positioning kit; the first positioning kit is also used in conjunction with the deformation groove provided on the grouting sleeve, and rubber anti-slip rings are also provided on the first positioning kit and the second positioning kit.

[0027] Preferably, the outer sleeve positioning component is a positioning arc block, which is used in conjunction with the positioning holes provided on the outer sleeve and the grouting sleeve, and a clearance groove is provided in the positioning arc block, which is used in conjunction with the grouting branch pipe.

[0028] The beneficial effects of the present invention are as follows: the present invention discloses a sleeve valve pipe for a shield tunnel passing through a railway throat area and a tracking grouting method thereof. Compared with the prior art, the present invention has the following improvements:

[0029] (1) The present invention designs a sleeve valve pipe tracking grouting method for a shield tunnel under a railway throat area. This method utilizes an existing pedestrian passage to set up a sleeve valve pipe, and simultaneously performs tracking grouting during shield construction to supplement stratum loss. This method can effectively track the grouting process and effectively prevent the throat area track settlement by supplementing stratum loss. It has the advantages of good grouting tracking effect and timely replenishment of stratum pressure.

[0030] (2) The present invention designs a sleeve valve tube, which includes an outer sleeve, a grouting sleeve and a grouting mechanism. During the grouting process, the position of the outer sleeve in the grouting hole of the sleeve valve tube, the relative position of the outer sleeve and the grouting sleeve, and the position of the grouting mechanism in the grouting sleeve can be effectively fixed by the grouting sleeve and the grouting mechanism. At the same time, during the grouting process, the grouting points around the grouting hole of the sleeve valve tube can be effectively grouted point by point in one direction, and grouting and grouting at grouting positions with different spacings can be realized. The use is flexible and convenient. In addition, the sleeve valve tube adopts an assembled structure, which is simple and convenient to assemble, can effectively improve construction efficiency, and has the advantages of high construction efficiency and flexible and convenient use. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a cross-sectional view of the shield tunnel of the present invention passing through the railway throat area.

[0032] Figure 2 This is a schematic structural diagram of the first section of the casing of the present invention.

[0033] Figure 3 It is a structural schematic diagram of the standard section casing of the present invention.

[0034] Figure 4 It is a structural schematic diagram of the last section of the casing of the present invention.

[0035] Figure 5 It is a cross-sectional view of the waterproof threaded kit of the present invention.

[0036] Figure 6 It is a structural schematic diagram of the grouting sleeve of the present invention.

[0037] Figure 7 It is a cross-sectional view of the outer sleeve of the present invention.

[0038] Figure 8 It is a cross-sectional view of the sleeve valve tube of the present invention.

[0039] Figure 9 This is a cross-sectional view of the sleeve valve tube of the present invention in use.

[0040] Figure 10 It is a structural schematic diagram of the grouting mechanism of the present invention.

[0041] Figure 11 It is a cross-sectional view of the positioning rod of the present invention.

[0042] Among them: 1. Pedestrian passage, 2. Underpass railway construction tunnel, 3. Sleeve valve pipe, 31. Outer sleeve, 311. Positioning hole, 312. Grouting hole, 313. External limit thread, 314. Conical head, 315. Connecting slot, 316. Connecting thread column, 32. Grouting sleeve, 321. Deformation groove, 322. Positioning clearance hole, 323. One-way closed valve plate, 3231. Sealing plate, 3232. Guide grouting blade, 324. Telescopic chamber, 33. Grouting pipe, 34. Grouting mechanism, 341. Positioning rod, 3411. Grouting groove, 342. Positioning plate, 343. First positioning kit, 3431. Clearance notch, 3432. Rubber anti-slip ring, 344. Gourd section, 3441. Slurry outlet hole, 345. Grouting branch pipe, 346. Positioning arc block, 3461. Clearance groove, 347. Second positioning kit, 35. Waterproof thread kit, 351. Waterproof ring. DETAILED DESCRIPTION

[0043] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0044] Example 1: Refer to the attached Figure 1 The tracking grouting method for a sleeve valve pipe in a shield tunnel passing under a railway throat area includes the following steps:

[0045] Step 1. Before construction, based on the design drawings and site conditions, accurately locate the sleeve valve pipe grouting points on both sides of the pedestrian walkway 1 above the underpass railway construction tunnel 2 and mark them with red paint.

[0046] The number and location of the sleeve valve pipe grouting points are determined by factors such as the relative distance between the underpass railway construction tunnel 2 and the pedestrian passage 1, the groundwater level, and the geological conditions.

[0047] Step 2. After determining the coordinates of the grouting points within the pedestrian passage 1, drill sleeve valve tube grouting holes at the points, and install the sleeve valve tube 3 after the sleeve valve tube grouting holes are drilled.

[0048] Step 3. After the sleeve valve pipe is installed, install the grouting machine for grouting;

[0049] Among them, in the above-mentioned grouting process, the slurry used is cement slurry, the water-cement ratio of cement slurry is 1:1, and the grouting pressure is controlled at 0.5~0.8MPa during the grouting process. The grouting end standard is as follows: the grouting pressure is gradually increased. When it reaches the set final pressure and continues to grout for more than 10 minutes, there is a certain grouting amount. The grouting amount at the end of grouting should generally reach more than 80% of the design amount.

[0050] Preferably, the sleeve valve pipe grouting connection hole drilling process described in Step 2 includes:

[0051] Step 201. Since the underpass frame of pedestrian walkway 1 is a reinforced concrete structure, to minimize disturbance and damage to the existing frame during the sleeve valve pipe drilling process, a Φ120 hydraulic drill is used to drill a hole in the underpass frame of pedestrian walkway 1. The drilling depth is equal to the thickness of the pedestrian walkway 1 frame.

[0052] The drilling process uses an HLZ-70 fully hydraulic crawler drilling machine with a maximum drilling diameter of 230 mm, a maximum drilling depth of 100 m, a mast stroke of 500 mm, and a power head stroke of 1100 mm. It can achieve inclined hole construction and the hole diameter is Φ108 mm.

[0053] Step 202. After the opening on the frame of pedestrian passage 1 is completed, the hole is extended and a sleeve valve pipe hole is drilled;

[0054] Step 203. After the sleeve valve tube hole is drilled, insert the sleeve valve tube 3 into the sleeve valve tube hole.

[0055] Preferably, the grouting machine described in step Step 3 is an HJB-6 grouting machine, and its main technical parameters are: overall dimensions 1250×430×850 mm, slurry discharge volume 6 m3 / h, maximum rated pressure 1.5-3 MPa, slurry inlet pipe inner diameter 51 mm, slurry outlet pipe inner diameter 38 mm; maximum conveying distance is 80 m vertically and 300 m horizontally.

[0056] Preferably, in this embodiment, pressure sensors are arranged at various monitoring positions in the sleeve valve tube borehole to track and monitor the grouting pressure and deformation at various detection positions in the sleeve valve tube borehole during the grouting process.

[0057] Example 2: Figure 2-11 As shown, the difference from Example 1 is that in order to effectively carry out tracking grouting on the side of the pedestrian passage 1 to supplement the stratum loss when grouting the sleeve valve tube grouting through-hole, the sleeve valve tube 3 includes an outer sleeve 31 and a grouting sleeve 32, and the grouting sleeve 32 is arranged in the outer sleeve 31, and a grouting mechanism 34 is arranged in the grouting sleeve 32, and the grouting mechanism 34 is connected to the grouting machine through the grouting pipe 33.

[0058] Preferably, the outer sleeve 31 is the outermost protective mechanism of the sleeve valve tube 3, which is used to be inserted into the sleeve valve tube grouting connection hole to prevent the sleeve valve tube grouting connection hole from collapsing and deforming. It includes a first section sleeve, multiple standard section sleeves and a last section sleeve. The first section sleeve and the standard section sleeve, the standard section sleeve and the standard section sleeve, and the standard section sleeve and the last section sleeve are all connected through a waterproof threaded kit 35, and the first section sleeve is arranged at the bottom of the sleeve valve tube grouting connection hole, and the last section sleeve is arranged at the port position of the sleeve valve tube grouting connection hole.

[0059] Preferably, in order to facilitate grouting of the strata inside and outside the grouting through-holes during use, the first section casing, the multi-section standard section casing and the last section casing are all provided with positioning holes 311, grouting holes 312, external limiting threads 313 and connecting threaded columns 316;

[0060] The positioning holes 311 and the grouting holes 312 are symmetrically arranged and used in conjunction with the grouting sleeve 32 and the grouting mechanism 34 to achieve positioning of the outer sleeve 31 in the grouting through-hole and grouting of the strata in and outside the grouting through-hole;

[0061] The outer limiting thread 313 is provided on the outside of the first section casing, the standard section casing and the last section casing, and is used to generate friction resistance with the grouting through-hole, so as to position the outer sleeve 31 in the grouting through-hole. When in use, the outer sleeve 31 can be rotated to utilize the friction between the outer limiting thread 313 and the grouting through-hole to facilitate the installation of the outer sleeve 31 into the grouting through-hole.

[0062] The connecting thread column 316 is arranged at the end of the first section casing, the two ends of the standard section casing and the front end of the last section casing, and is used in conjunction with the waterproof threaded kit 35 to achieve the connection between the first section casing, the standard section casing and the last section casing. At the same time, in order to play a waterproof role, a waterproof ring 351 is also embedded in the middle of the waterproof threaded kit 35.

[0063] Preferably, in order to prevent the separated structural soil in the grouting penetration hole from forming resistance to the first section of the casing during the process of the outer casing 31 penetrating into the grouting penetration hole, thereby affecting the penetration of the outer casing 31, a conical head 314 is integrally provided at the front end of the first section of the casing, and the front end of the first section of the casing is sealed by the conical head 314 to prevent groundwater and grouting water from flowing back into the first section of the casing.

[0064] Preferably, in order to facilitate the interconnection of the sleeve valve tubes 3 at all sleeve valve tube grouting points to form an integral support structure after the grouting is completed, a connecting slot 315 is also provided at the end of the said last section casing. The said connecting slot 315 is used in conjunction with the steel strand to connect the sleeve valve tubes 3 at the sleeve valve tube grouting points to form an integral support structure to enhance the stability of the pedestrian passage 1 frame.

[0065] Preferably, the grouting sleeve 32 is movably installed in the outer sleeve 31 and is fixedly connected to the grouting mechanism 34. When in use, it is used in conjunction with the grouting mechanism 34. The grouting mechanism 34 includes a positioning rod 341, which is screwed to the grouting pipe 33, and is provided with a positioning rod positioning assembly, a grouting assembly and an outer sleeve positioning assembly on the positioning rod 341. The positioning rod positioning assemblies are symmetrically arranged at both ends of the outer sleeve positioning assembly for positioning the positioning rod 341 in the grouting sleeve 32.

[0066] The outer sleeve positioning components are symmetrically arranged at both ends of the grouting component, and are used to position the grouting sleeve 32 in the outer sleeve 31 and the outer sleeve 31 in the sleeve valve pipe grouting through-hole.

[0067] The grouting assembly is used in conjunction with the positioning rod positioning assembly and the outer sleeve positioning assembly.

[0068] Preferably, in order to facilitate grouting during use, a grouting groove 3411 is further provided in the positioning rod 341, and the grouting groove 3411 is used in conjunction with the grouting pipe 33, and a plurality of slurry outlet holes 3441 are provided on the positioning rod 341, and the slurry outlet holes 3441 are connected to the grouting groove 3411, and the grouting assembly is arranged in the middle of the positioning rod 341, including a one-way closing valve plate 323 and a grouting branch pipe 345; the one-way closing valve plate 323 is movably mounted on the outside of the grouting sleeve 32, and the guide grouting blades 3232 at both ends are used in conjunction with the grouting hole 312, that is, the grouting hole 312 is sealed and blocked in the non-grouting state, and the grouting pressure is used to push the one-way closing valve plate 323 forward during grouting, thereby opening the grouting hole 312 and grouting the outer structure of the grouting hole 312; the grouting branch pipe 345 is symmetrically arranged on both sides of the one-way closing valve plate 323, and is used in conjunction with the outer sleeve positioning assembly.

[0069] Preferably, sealing plates 3231 are also provided at both ends of the one-way closing valve disc 323, and the sealing plates 3231 are in close contact with the side holes of the grouting sleeve 32 to prevent the slurry from entering the telescopic cavity 324 on the rear side of the one-way closing valve disc 323 during grouting, ensuring that when the outside of the one-way closing valve disc 323 is subjected to pressure during the grouting process, the one-way closing valve disc 323 can be re-stuck in the grouting hole 312 to prevent the slurry from flowing back during the grouting process.

[0070] Preferably, in order to assist in positioning the positioning rod 341 in the grouting sleeve 32 after the grouting process using the slurry outlet hole 3441, a gourd section 344 is provided in the middle of the positioning rod 341 to increase its contact area with the external concrete slurry and prevent it from moving.

[0071] Preferably, in order to facilitate the positioning of the positioning rod 341 in the grouting sleeve 32, the positioning rod positioning assembly includes a plurality of first positioning kits 343 and second positioning kits 347, the first positioning kits 343 and the second positioning kits 347 are both movably sleeved on the positioning rod 341, wherein the second positioning kit 347 is arranged on the positioning rod 341 near the side of the grouting assembly, the first positioning kits 343 are movably sleeved on the small end of the second positioning kit 347, and the small end of the first positioning kit 343 is used in conjunction with the positioning disk 342 arranged on the positioning rod 341, and in the first positioning kit The parts 343 are all provided with trapezoidal clearance notches 3431, and the very end, that is, when the large end of the second positioning kit 347 is subjected to grouting pressure, pushes the second positioning kit 347 as a whole to move to the side away from the grouting assembly, thereby continuously pressing the first positioning kit 343 behind it. Under the action of the positioning plate 342, the clearance notches 3431 of the first positioning kit 343 are continuously expanded, thereby making the overall diameter of the first positioning kit 343 continuously larger, and then closely contacting the inner wall of the grouting sleeve 32, positioning the position of the positioning rod 341 in the grouting sleeve 32, so as to facilitate the grouting using the grouting assembly in the later stage.

[0072] Preferably, in order to facilitate installation and assembly, the positioning plate 342 is screwed onto the positioning rod 341; at the same time, in order to facilitate the relative fixation of the position of the grouting sleeve 32 and the outer sleeve 31 when the positioning rod positioning assembly is working, a deformation groove 321 is also provided on the grouting sleeve 32 at the corresponding position of the above-mentioned several first positioning kits 343. When in use, the deformation groove 321 becomes larger under the interaction of the first positioning kit 343 and the second positioning kit 347, resulting in the position of the grouting sleeve 32 in the outer sleeve 31 being further fixed.

[0073] Preferably, in order to increase friction, a rubber anti-slip ring 3432 is further provided on the first positioning kit 343 and the second positioning kit 347 , and the rubber anti-slip ring 3432 is used in conjunction with the inner wall of the grouting sleeve 32 .

[0074] Preferably, the outer sleeve positioning component is a positioning arc block 346, and the positioning arc block 346 is used in conjunction with the positioning hole 311 provided on the outer sleeve 31 and the grouting sleeve 32, and a clearance groove 3461 is provided in the positioning arc block 346, and the clearance groove 3461 is used in conjunction with the grouting branch pipe 345. During grouting, the grouting pressure of the grouting branch pipe 345 is used to move the positioning arc block 346 forward and press it into the side wall of the grouting through-hole to position the sleeve valve tube 3 in the grouting through-hole; at the same time, in order to increase the friction force and contact area, a positioning thread is also provided on the outside of the positioning arc block 346.

[0075] Preferably, during the installation process, in order to prevent the soil in the sleeve valve tube grouting hole from contaminating the outer sleeve 31 and the grouting sleeve 32, the positioning hole 311, the grouting hole 312 and the slurry outlet hole 3441 are blocked with plaster before installation.

[0076] Preferably, the grouting sleeve 32 is further provided with a positioning hole 322 , and the positioning hole 322 is used in conjunction with the positioning arc block 346 .

[0077] Preferably, the outer sleeve 31 is made of a PVC tube, and the standard lengths of the sleeves are the same.

[0078] The installation and grouting process of the sleeve valve tube 3 in this embodiment includes:

[0079] (1) Splicing and installing the outer casing: first, before the installation, according to the drilling depth of the sleeve valve tube hole at the corresponding position, select a first section of casing, a last section of casing and several standard sections of casing, so that their lengths match the drilling depth of the sleeve valve tube hole, and connect the first section of casing, the last section of casing and the standard section of casing using a waterproof threaded kit 35 to form an integral outer casing 31, and then use the installation equipment to install the outer casing 31 in the sleeve valve tube hole (or splice while installing);

[0080] Note that in this process, the outer sleeve 31 can be rotated to utilize the friction between the outer limiting thread 313 and the grouting through-hole to facilitate installation of the outer sleeve 31 into the grouting through-hole;

[0081] (2) Installation of the grouting sleeve 32 and the grouting mechanism 34: First, install the positioning arc block 346 on the grouting branch pipe 345. After the positioning arc block 346 is installed, the first positioning kit 343 and the second positioning kit 347 are installed on both ends of the positioning rod 341. After the installation is completed, install the positioning plate 342. After the positioning plate 342 is screwed on, the grouting sleeve 32 is installed on the outside of the grouting mechanism 34. After the grouting sleeve 32 is installed, the one-way closing valve plate 323 is installed. This completes the installation of the grouting sleeve 32 and the grouting mechanism 34.

[0082] (3) Positioning and grouting: After the installation is completed, the positioning rod 341 is connected to the grouting pipe 33, and the grouting sleeve 32 is extended into the appropriate grouting position in the outer sleeve 31 by extending the grouting pipe 33, and the extension of the grouting pipe 33 is stopped after it is found; at this time, the grouting machine is turned on, and the slurry from the grouting groove 3411 first enters the grouting branch pipe 345, pressing out the positioning arc block 346, so that the positioning arc block 346 is pressed into the side wall of the grouting through-hole, and the position of the sleeve valve pipe 3 in the grouting through-hole is positioned; after the positioning is completed, the grouting pressure continues to increase, breaking the gypsum at the slurry outlet hole 3441, so that the slurry outlet hole 3441 is opened. After the slurry outlet hole 3441 is opened, the slurry enters the area between the two positioning rod positioning components, and the second positioning kit 347 is positioned. The second positioning kit 347 is squeezed to push the first positioning kit 343 to move to both ends. In this process, the notch 3431 of the first positioning kit 343 is continuously expanded under the force of the positioning plate 342, thereby making the overall diameter of the first positioning kit 343 continuously larger, and closely contacting the inner wall of the grouting sleeve 32, so as to position the positioning rod 341 in the grouting sleeve 32; after the positioning is completed, the grouting pressure continues to form pressure on the one-way closed valve disc 323, so that the one-way closed valve disc 323 moves backward, opens the grouting hole 312, and grouts the sleeve valve pipe grouting through hole and its surrounding structure. After the single-section grouting is completed, the grouting pipe 33 is disassembled from the positioning rod 341, and steps (2) and (3) are repeated until the grouting is completed;

[0083] (4) After the grouting is completed, the connecting slots 315 of each sleeve valve tube 3 are connected by steel strands to form an integral support structure to enhance the stability of the pedestrian passage 1 frame.

[0084] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A sleeve valve pipe for a shield tunnel passing under a railway throat area, characterized by: The shield tunnel passes through the sleeve valve pipe in the throat area of ​​the railway based on the sleeve valve pipe. The sleeve valve pipe includes an outer sleeve and a grouting sleeve. The outer sleeve is arranged in the grouting hole of the sleeve valve pipe. The grouting sleeve is arranged in the outer sleeve, and a grouting mechanism is arranged in the grouting sleeve. The grouting mechanism is connected to the grouting machine through the grouting pipe. The grouting mechanism includes a positioning rod, which is screwed to the grouting pipe, and is provided with a positioning rod positioning assembly, a grouting assembly and an outer sleeve positioning assembly on the positioning rod; wherein the positioning rod positioning assembly is symmetrically arranged at both ends of the outer sleeve positioning assembly, and the outer sleeve positioning assembly is symmetrically arranged at both ends of the grouting assembly, and the grouting assembly is used in conjunction with the positioning rod positioning assembly and the outer sleeve positioning assembly; and a grouting groove is further provided in the positioning rod, and the grouting groove is used in conjunction with the grouting pipe, and a plurality of slurry outlet holes are provided on the positioning rod, and the slurry outlet holes are connected to the grouting groove; Step 1. Before construction, based on the design drawings and site conditions, accurately lay out and mark the sleeve valve pipe grouting points on both sides of the pedestrian walkway above the underpass under the railway construction tunnel; Step 2. After determining the coordinates of the grouting points within the pedestrian walkway, drill holes for the sleeve valve pipe grouting at those points. After drilling the holes, install the sleeve valve pipe. Step 3. After the sleeve valve pipe is installed, install the grouting machine for grouting.

2. The sleeve valve pipe for a shield tunnel passing under a railway throat area according to claim 1, characterized in that: The outer sleeve includes a first section sleeve, a multi-section standard section sleeve and a last section sleeve. The first section sleeve, the standard section sleeve and the last section sleeve are connected by a waterproof threaded kit, and the first section sleeve is arranged at the bottom of the sleeve valve tube grouting hole, and the last section sleeve is arranged at the port part of the sleeve valve tube grouting hole; and positioning holes, grouting holes, external limit threads and connecting thread columns are provided on the first section sleeve, the multi-section standard section sleeve and the last section sleeve. The connecting thread columns are used in conjunction with the waterproof threaded kit, and a waterproof ring is also embedded in the middle of the waterproof threaded kit; the front end of the first section sleeve is also integrally provided with a conical head for use in conjunction with the sleeve valve tube grouting hole.

3. The sleeve valve pipe for a shield tunnel passing under a railway throat area according to claim 1, characterized in that: The grouting assembly is arranged in the middle of the positioning rod, and includes a one-way closed valve disc and a grouting branch pipe. The one-way closed valve disc is movably installed on the outside of the grouting sleeve, and the guide grouting blades at both ends are used in conjunction with the grouting holes. The grouting branch pipe is symmetrically arranged on both sides of the one-way closed valve disc and is used in conjunction with the outer sleeve positioning assembly. Sealing plates are also provided at both ends of the one-way closed valve disc, and the sealing plates are used in conjunction with the side holes of the grouting sleeve. A gourd section is provided in the middle of the positioning rod, and the slurry outlet is provided on the gourd section.

4. The sleeve valve pipe for a shield tunnel passing under a railway throat area according to claim 1, characterized in that: The positioning rod positioning assembly includes several first positioning kits and second positioning kits, and the first positioning kit and the second positioning kit are both conical sleeves that are movably mounted on the positioning rod, wherein the second positioning kit is movably mounted on the positioning rod on one side close to the grouting assembly, and the first positioning kit is movably mounted on the small head end of the second positioning kit, and the small head end of the first positioning kit is used in conjunction with the positioning plate set on the positioning rod; and a trapezoidal clearance notch is opened on the first positioning kit; the first positioning kit is also used in conjunction with the deformation groove set on the grouting sleeve, and rubber anti-slip rings are also provided on the first positioning kit and the second positioning kit.

5. The sleeve valve pipe for a shield tunnel passing through a railway throat area according to claim 1, characterized in that: The outer sleeve positioning component is a positioning arc block, which is used in conjunction with the positioning holes provided on the outer sleeve and the grouting sleeve, and a clearance groove is provided in the positioning arc block, which is used in conjunction with the grouting branch pipe.

Images