Construction method of embedded channel for catenary of tunnel

Abstract

The application discloses a construction method for a pre-buried channel of a catenary in a tunnel, which comprises a secondary lining trolley slidingly arranged in the tunnel and a positioning tool detachably connected with the secondary lining trolley, a gap for secondary lining construction is left between the tunnel and the secondary lining trolley, and the secondary lining is constructed in sections; the construction method comprises the following steps: channel fixing hole opening; steel bar production and installation of the secondary lining; secondary lining trolley walking; positioning tool installation; pre-buried channel installation; secondary lining construction. The pre-buried channel is pushed and pulled by the positioning tool, so that the pre-buried channel is gradually moved to the designed position, based on which, not only is the operation simple and easy to master, but also the problem of narrow space is effectively overcome, and the speed of pre-buried channel installation is improved. With the channel fixing hole, the pre-buried channel can be fixed, and the efficiency and accuracy of pre-buried channel positioning can be improved.

Description

Technical Field

[0001] This invention belongs to the field of pre-embedded channel construction technology, specifically relating to a construction method for pre-embedded channels for contact wires in tunnels. Background Technology

[0002] During operation, high-speed railway tunnels are powered by pre-embedded channels installed with suspension columns and contact wires during the underground construction. The construction of these pre-embedded channels is simple and easily overlooked.

[0003] During the construction of embedded channels, the key is to install and securely fix the channels in the designed position before pouring concrete. Current techniques use manual labor, which can easily lead to inconsistencies in installation position due to operational errors. Adjusting the position of the embedded channels requires workers to enter the formwork, but the gap between the formwork and the tunnel is only 30-40 centimeters, making construction difficult. Current techniques allow workers to adjust within a relatively spacious area at the end of the formwork, but the adjustment range is limited, making it difficult to achieve the designed position for the embedded channels. Summary of the Invention

[0004] The purpose of this invention is to provide a construction method for pre-embedded contact wire channels in tunnels, in order to solve the above-mentioned problems existing in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A construction method for pre-embedded channels of contact wire in tunnels includes a secondary lining trolley that is slidably set in the tunnel and a positioning fixture that can be detachably connected to the secondary lining trolley. A gap is left between the tunnel and the secondary lining trolley for secondary lining construction, and the secondary lining is constructed in sections. The construction method includes the following steps: Channel fixing holes are opened; The fabrication and installation of reinforcing steel bars for the secondary lining; The secondary lining trolley moves; Positioning tooling installation; Installation of pre-embedded channels; Secondary lining construction; Among them, the channel positioning hole is located on the template of the secondary lining trolley, and the channel is installed in the pre-embedded channel installation step.

[0006] In one possible design, the secondary lining trolley is provided with two positioning fixtures at intervals, the positioning fixtures including a fixed module and a sliding module; The fixing module includes a fixing seat and a support plate. The fixing seat has two opposite ends, one end of which is fixedly connected to the end of the secondary lining trolley, and the other end is connected to the support plate. The top surface of the support plate extends above the top surface of the secondary lining trolley. The sliding module includes a sliding sleeve and a moving beam. The outer periphery of the sliding sleeve is fixed to the top surface of the support plate. The inner periphery of the sliding sleeve is provided with a sliding hole adapted to the moving beam. The moving beam passes through the sliding hole and can slide back and forth along the sliding hole. One end of the moving beam is the working end located above the secondary lining trolley. The working end of the moving beam is provided with a push-pull rod for abutting the pre-embedded channel.

[0007] In one possible design, the sliding hole is provided with several sliding groups arranged at intervals along the axial direction of the sliding hole. Each sliding group includes several sliding wheels evenly distributed around the circumference of the sliding hole. Accordingly, the sliding hole is connected to the moving beam through the sliding wheels.

[0008] In one possible design, the support plate is provided with a rotating shaft, a handle and a transmission gear. The rotating shaft is rotatably mounted on the support plate, wherein the end of the rotating shaft extends outside the support plate and is connected to the handle, and the middle part of the rotating shaft is located inside the support plate and is connected to the transmission gear. Correspondingly, the moving beam is provided with a transmission chain meshing with the transmission gear, and the support plate and the sliding sleeve are provided with transmission grooves for connecting the sliding hole.

[0009] In one possible design, the secondary lining trolley is equipped with a movable cover plate located below the channel fixing hole; The movable cover plate includes a first base, a second base, a cover plate body, and a fixing rod. The first base and the second base are arranged opposite each other and located on both sides of the channel fixing hole. One of the first base and the second base is rotatably connected to the cover plate body, and the other is rotatably connected to the fixing rod. The end of the cover plate body facing the fixing rod is provided with a locking groove adapted to the fixing rod. A sealing block is provided on the outer surface of the cover plate body facing the channel fixing hole. The sealing block is used to seal the channel fixing hole. The fixing rod is constructed as a screw rod, and a matching locking nut is provided on the screw rod.

[0010] In one possible design, during the fabrication and installation of the reinforcing steel in step two, the position of the reinforcing steel mesh is adjusted to form an installation groove for the pre-embedded channel anchor rods to pass through.

[0011] In one possible design, the pre-embedded channel installation includes the following steps: The pre-embedded channel is placed on the top surface of the secondary lining trolley; The positioning fixture abuts against the anchor rod of the pre-embedded channel via a push-pull rod; Push and pull the moving beam to move the embedded channel along the top surface of the secondary lining trolley until the embedded channel moves to the channel fixing hole; Adjust and fix the pre-embedded channel.

[0012] In one possible design, step two of the lining construction includes the following steps: Positioning and sealing the ends of the secondary lining trolley; Pour concrete; Demolding and curing.

[0013] Beneficial effects: By using positioning fixtures to push and pull the embedded channels, the channels are gradually moved to their designed positions. This method is not only simple and easy to master, but also effectively overcomes the problem of limited space, increasing the installation speed of the embedded channels. The addition of channel fixing holes not only secures the embedded channels but also improves the efficiency and accuracy of their positioning.

[0014] The positioning fixture has a fixed position, and the installation position of the pre-embedded channel is uniform, which helps to improve the installation accuracy of the pre-embedded channel. The positioning fixture is simple to use, has low requirements for operators, is easy to promote, and can achieve high-precision installation of pre-embedded channels. Compared with existing construction methods, it does not require operators to enter the gap to work, which greatly reduces the safety hazards during construction. Attached Figure Description

[0015] Figure 1 This is a flowchart of a construction method for pre-embedded channels for overhead contact lines in tunnels.

[0016] Figure 2 This is a structural diagram of the liner trolley used for positioning tooling.

[0017] Figure 3 for Figure 2 A three-dimensional schematic diagram.

[0018] Figure 4 This is a structural diagram of the positioning fixture.

[0019] Figure 5 This is a structural diagram of the movable cover plate.

[0020] In the picture: 100. Secondary lining trolley; 200. Positioning fixture; 210. Fixing module; 211. Fixing seat; 212. Support plate; 220. Sliding module; 221. Sliding sleeve; 222. Moving beam; 201. Push-pull rod; 202. Sliding wheel; 203. Rotating shaft; 204. Handle; 205. Transmission gear; 300. Embedded channel; 401. First base; 402. Second base; 403. Cover plate body; 404. Fixing rod; 405. Locking groove; 406. Sealing block; 407. Locking nut. Detailed Implementation

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the accompanying drawings is only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be noted that the description of these embodiments is for the purpose of helping to understand the present invention, but does not constitute a limitation of the present invention.

[0022] Example: like Figures 1-5 As shown, a construction method for pre-embedded channels of contact wire in tunnels includes a secondary lining trolley 100 slidably installed in the tunnel and a positioning fixture 200 detachably connected to the secondary lining trolley 100. A gap is left between the tunnel and the secondary lining trolley 100 for secondary lining construction, and the secondary lining is constructed in sections. The construction method includes the following steps: Channel fixing holes are opened; The fabrication and installation of reinforcing steel bars for the secondary lining; The secondary lining trolley travels at 100 km / h. 200 positioning fixtures are installed; 300mm pre-embedded channel installation; Secondary lining construction; Among them, the channel positioning hole is located on the template of the secondary lining trolley 100, and the pre-embedded channel 300 is installed in the step.

[0023] In the construction method for the pre-embedded channel of the contact wire in the tunnel, the secondary lining is constructed in sections using the secondary lining trolley 100. During the construction of each sub-section of the secondary lining, the pre-embedded channel 300 is installed to the design position before the secondary lining concrete is poured, thereby fixing the pre-embedded channel 300 in the design position. This effectively improves the installation accuracy of the pre-embedded channel 300, shortens the installation time, and improves the construction efficiency.

[0024] Specifically, the pre-embedded channel 300 is moved gradually to its designed position by pushing and pulling the positioning fixture 200. This method is not only simple and easy to master, but also effectively overcomes the problem of limited space and improves the installation speed of the pre-embedded channel 300. The addition of channel fixing holes not only secures the pre-embedded channel 300, but also improves the efficiency and accuracy of its positioning.

[0025] To further explain based on actual construction, the secondary lining trolley 100 is located inside the tunnel, and a gap is formed between the top surface of the trolley 100 and the inner circumference of the tunnel. The secondary lining is constructed within this gap. The height of this gap is generally 30-40 centimeters, while the length of the secondary lining trolley 100 is generally over 10 meters. This leaves the workers with a narrow, arc-shaped working space, making it difficult to move the pre-embedded channel 300 within this gap. Furthermore, it is easy to understand that the gap is adapted to the tunnel, meaning it is also annular. The pre-embedded channel 300 is also segmented and arranged on the same circumference. Therefore, during installation, the pre-embedded channel 300 needs to consider not only the positional deviation along the tunnel's axial direction but also the positional deviation along the tunnel's circumferential direction.

[0026] The construction method will be explained in conjunction with the following steps: The secondary lining is constructed in sections, with the length of each section being less than the length of the secondary lining trolley 100, to ensure that the secondary lining trolley 100 can completely cover each construction section.

[0027] The purpose of opening the channel fixing holes is to fix the pre-embedded channel 300, ensuring that the pre-embedded channel 300 will not shift during concrete pouring; it also serves a positioning function, so that a single segment of the pre-embedded channel 300 is in the designed position in the same circumferential direction. Furthermore, by setting multiple channel fixing holes in the circumferential direction of the secondary lining trolley 100, multiple segments of the pre-embedded channel 300 can be moved to the designed position, thereby forming the required annular pre-embedded channel 300.

[0028] Note that an inspection should be conducted before drilling, and the positions of the channel fixing holes should be calculated according to the design requirements to ensure that the number of holes is minimized while meeting the fixing needs. Simultaneously, the secondary lining trolley 100 should be inspected to ensure that the distance between the embedded channels 300 in the same group and the edge of the template is consistent, and that the construction error perpendicular to the tunnel centerline meets the accuracy requirements. It should also be ensured that the tilting construction error of the embedded channels 300 meets the design requirements. The top of the secondary lining trolley 100 is equipped with several templates, which form the pouring surface for the secondary lining construction.

[0029] Once the hole location is selected, drill the hole at the designed position. Drill the hole in one go to avoid rework.

[0030] It is easy to understand that during the construction of the same tunnel, each secondary lining section can share the same set of channel fixing holes, that is, the channel fixing holes are universal and can be processed before the secondary lining construction.

[0031] It is easy to understand that before the fixing holes of the step channel are opened, construction preparation should be carried out. Construction preparation includes, but is not limited to, personnel preparation, material preparation, construction plan preparation, and emergency plan preparation. Those skilled in the art can refer to the existing construction preparation to carry out specific design, which will not be elaborated here.

[0032] Step two involves the fabrication and installation of the reinforcing steel for the tunnel lining. To avoid disrupting the normal construction process of the secondary lining, the reinforcing steel for the lining (one ring of lining length) is tied first, followed by the installation and positioning of the pre-embedded channel 300. Since the coordinates of the pre-embedded channel 300 are known, its installation position can be determined. During the tying of the reinforcing steel, the spacing of the steel bars can be adjusted appropriately at this location to facilitate the subsequent installation of the pre-embedded channel 300. Furthermore, if the anchor bolts of the pre-embedded channel 300 conflict with the reinforcing mesh, the anchor bolts must not be cut; instead, the reinforcing steel can be adjusted.

[0033] In step two, during the movement of the lining trolley 100, which includes a lifting cylinder, the template is raised and lowered. A gap is formed between the template of the lining trolley 100 and the reinforcing steel of the secondary lining. This gap is too low to accurately install the pre-embedded channel 300. The existing solution is to extend the travel track of the lining trolley 100 after the reinforcing steel of the secondary lining is tied, so that the track exceeds the length of one lining trolley 100 of the tied steel section. The lining trolley 100 travels to an appropriate position in the next ring of the tied steel section (without tied steel), where there is a space of about 700-800mm, which facilitates the installation and positioning of the pre-embedded channel 300 on the template of the lining trolley 100.

[0034] In the construction method for the pre-embedded channel of the contact wire used in the tunnel, the positioning fixture 200 is used to complete the installation and positioning of the pre-embedded channel 300 without moving the secondary lining trolley 100. This ensures the installation accuracy of the pre-embedded channel 300 while improving the installation speed.

[0035] The positioning fixture 200 is installed in step 2, that is, the positioning station is installed on the secondary lining trolley 100 to facilitate the movement of the pre-embedded channel 300.

[0036] The installation of the pre-embedded channel 300 involves the operator using the positioning tool 200 to move the pre-embedded channel 300 to the designed position.

[0037] Step 2: Lining construction. Through the above construction procedures, the pre-embedded channel 300 is installed in the designed position. The secondary lining construction is completed except for the reinforcement fabrication. The construction of the secondary lining and the pre-embedded channel 300 is then completed.

[0038] In this embodiment, two positioning fixtures 200 are provided at intervals on the secondary lining trolley 100. Based on the above design scheme, the pre-embedded channel 300 is a standard part. Considering the length of the pre-embedded channel 300 and the operating space reserved for the operator, it is preferable to set two positioning fixtures 200.

[0039] In one possible implementation, the positioning fixture 200 includes a fixed module 210 and a sliding module 220; The fixing module 210 includes a fixing seat 211 and a support plate 212. The fixing seat 211 has two opposite ends, one end of which is fixedly connected to the end of the lining trolley 100, and the other end is connected to the support plate 212. The top surface of the support plate 212 extends above the top surface of the lining trolley 100. The sliding module 220 includes a sliding sleeve 221 and a moving beam 222. The outer periphery of the sliding sleeve 221 is fixed to the top surface of the support plate 212. The inner periphery of the sliding sleeve 221 is provided with a sliding hole adapted to the moving beam 222. The moving beam 222 passes through the sliding hole and can slide back and forth along the sliding hole. One end of the moving beam 222 is the working end located above the secondary lining trolley 100. The working end of the moving beam 222 is provided with a push-pull rod 201 for abutting against the pre-embedded channel 300.

[0040] Based on the above design, the fixing module 210 is set on the end face of the secondary lining trolley 100, which will not affect the use of the secondary lining trolley 100 or the construction of the secondary lining. Therefore, the fixing module 210 is preferably fixed on the secondary lining trolley 100 in advance. The sliding module 220 is detachably connected to the fixing module 210. When the step positioning fixture 200 is installed, the sliding module 220 is connected to the fixing module 210. At other times, the sliding module 220 is removed.

[0041] For the fixed module 210, both the fixed base 211 and the support plate 212 can be constructed into any suitable shape. For the sliding module 220, the support plate 212 is connected by a sliding sleeve 221, and the moving beam 222 is inserted into the sliding sleeve 221. The moving beam 222 abuts against the anchor rod of the pre-embedded channel 300 through the push-pull rod 201, so that the pre-embedded channel 300 moves along the top surface of the secondary lining trolley 100.

[0042] Based on this, the operator can move the pre-embedded channel 300 by operating at the end of the secondary lining trolley 100, without the need for the operator to enter the narrow gap to carry out the work, thus reducing safety hazards.

[0043] In one possible implementation, the sliding hole is provided with several sliding groups spaced apart along the axial direction of the sliding hole. Each sliding group includes several sliding wheels 202 evenly distributed around the circumference of the sliding hole. Correspondingly, the sliding hole is connected to the moving beam 222 through the sliding wheels 202. Based on the above design, the friction type between the sliding sleeve 221 and the moving beam 222 is changed to rolling friction by the sliding wheels 202, which effectively reduces frictional resistance. This not only improves the convenience of operation but also reduces the wear of the sliding sleeve 221 and the moving beam 222.

[0044] In one possible implementation, the support plate 212 is provided with a rotating shaft 203, a handle 204 and a transmission gear 205. The rotating shaft 203 is rotatably mounted on the support plate 212, wherein the end of the rotating shaft 203 extends out of the support plate 212 and is connected to the handle 204, and the middle part of the rotating shaft 203 is located inside the support plate 212 and is connected to the transmission gear 205. Correspondingly, the moving beam 222 is provided with a transmission chain meshing with the transmission gear 205, and the support plate 212 and the sliding sleeve 221 are provided with transmission grooves for connecting the sliding hole.

[0045] Based on the above design, the operator rotates handle 204, which drives the rotating shaft 203 to rotate. The rotation of the rotating shaft 203 is transmitted to the transmission chain through the transmission gear 205, thereby realizing the reciprocating movement of the moving beam 222 along the sliding sleeve 221. Furthermore, by adjusting the rotation direction of handle 204 and the abutment position of push-pull rod 201, the reciprocating movement of the embedded channel 300 can be realized. This not only enables the rapid installation of the embedded channel 300 but also allows for adjustment of its position, improving installation accuracy.

[0046] Preferably, a drive is used instead of the handle 204. Based on this, the drive provides driving force, thereby driving the rotating shaft 203 to rotate. That is, the drive replaces manual labor, further reducing the workload of the operator, and any suitable commercially available device can be used as the drive.

[0047] In this embodiment, the secondary lining trolley 100 is provided with a movable cover plate located below the channel fixing hole; The movable cover plate includes a first base 401, a second base 402, a cover plate body 403, and a fixing rod 404. The first base 401 and the second base 402 are arranged opposite each other and are located on both sides of the channel fixing hole. One of the first base 401 and the second base 402 is rotatably connected to the cover plate body 403, and the other is rotatably connected to the fixing rod 404. The end of the cover plate body 403 facing the fixing rod 404 is provided with a locking groove 405 adapted to the fixing rod 404. A sealing block 406 is provided on the outer surface of the cover plate body 403 facing the channel fixing hole. The sealing block 406 is used to seal the channel fixing hole. The fixing rod 404 is constructed as a screw rod, and a matching locking nut 407 is provided on the screw rod.

[0048] Based on the above design, the placement of the channel positioning holes creates openings in the secondary lining trolley 100. During secondary lining construction, concrete will be poured, and this concrete may leak out through the channel positioning holes. Therefore, to prevent leakage, a movable cover plate is used for sealing. Specifically: When opening the channel fixing hole, rotate the locking nut 407 away from the cover plate body 403, then rotate the fixing rod 404 and disengage it from the locking groove 405. At this point, the fixing rod 404 is released from its limiting position on the cover plate body 403. Rotate the cover plate body 403 until the sealing block 406 disengages from the channel fixing hole. At this point, the bolt passes through the channel fixing hole and fixes the pre-embedded channel 300. It is easy to understand that the bolt head shape is adapted to the shape of the channel fixing hole, thus achieving sealing through the bolt.

[0049] When sealing the channel fixing hole, rotate the cover plate body 403 until both ends of the cover plate body 403 press against the first base 401 and the second base 402 respectively. At this time, the sealing block 406 is inserted into the channel fixing hole and achieves sealing. Rotate the fixing rod 404 until the fixing rod 404 is inserted into the locking groove 405, and tighten the locking nut 407 to press the cover plate body 403. Based on this, the channel fixing hole is sealed by the movable cover plate.

[0050] Preferably, since bolts do not have sealing properties, when bolts are inserted into the channel fixing holes, a sealing layer is filled into the channel fixing holes to prevent local grout leakage. Optionally, the sealing layer is composed of a foaming agent.

[0051] In this embodiment, during the fabrication and installation of the reinforcing steel in step two, the position of the reinforcing steel mesh is adjusted to form an installation groove for the anchor rods of the pre-embedded channel 300 to pass through. Based on the above design scheme, the installation groove is formed by adjusting the position of the reinforcing steel mesh, thereby improving the ease of installation of the pre-embedded channel 300.

[0052] In this embodiment, the installation of the pre-embedded channel 300 includes the following steps: The pre-embedded channel 300 is placed on the top surface of the secondary lining trolley 100; The positioning fixture 200 abuts against the anchor rod of the pre-embedded channel 300 via the push-pull rod 201; Push and pull the movable beam 222 to move the embedded channel 300 along the top surface of the secondary lining trolley 100 until the embedded channel 300 moves to the channel fixing hole; Adjust and fix the pre-embedded channel 300.

[0053] Based on the above design scheme, the pre-embedded channel 300 is moved to the design position by the positioning fixture 200. The working principle of the positioning fixture 200 has been explained in conjunction with its structure, and will not be repeated here.

[0054] In this embodiment, step two, lining construction, includes the following steps: The positioning and sealing of the secondary lining trolley 100 are carried out. The traveling rails of the secondary lining trolley 100 are laid according to the survey and layout data to ensure that the centerline of the trolley 100 coincides with the centerline of the tunnel. After traveling to the construction section, further adjustments are made based on the control points on both sides and the arch apex to improve the positioning accuracy of the secondary lining trolley 100. Surveyors inspect the end section of the secondary lining trolley 100 to ensure that the cross-sectional dimensions and position meet the design requirements before reinforcing the secondary lining trolley 100 and the trolley end formwork, thus completing the preparation for concrete pouring.

[0055] Concrete pouring; before pouring, the quality inspector will conduct a final inspection to ensure that all formwork on the secondary lining trolley 100 is properly aligned; during pouring, the concrete will be poured in layers, window by window, from bottom to top, symmetrically layered, with a free fall height not exceeding 2 meters. During concrete pouring, the condition of the formwork and channels will be observed; if deformation or displacement is found, reinforcement measures should be taken immediately. If insufficient slump is found during pouring, water must not be added arbitrarily; instead, a water-reducing agent should be added under the guidance of testing personnel to resolve the issue.

[0056] Furthermore, concrete pouring must be continuous. If there is a break for any reason, the break time should be less than the initial setting time of the previous layer of concrete. When pouring new concrete on top of the newly poured lower layer, a vibrator should be used to vibrate the two layers of concrete together to prevent cold joints from forming.

[0057] Concrete should be poured in symmetrical layers, with vibration occurring simultaneously. The height difference between the front and rear of the concrete trolley should not exceed 0.6 meters, and the height difference between the left and right sides should not exceed 0.5 meters.

[0058] First, all windows are leveled in layers using an immersion vibrator. Then, the concrete is vibrated using an immersion vibrator, kept vertical, inserted quickly and withdrawn slowly, with vibration points evenly distributed, until no more air bubbles appear, no more settling occurs, and no more slurry appears on the surface. Once the concrete is poured to a height of 1 meter above the plate vibrator, the entire row of high-frequency plate vibrators at that height is activated. Each activation lasts 5 seconds, with each row activated 3 times, with an interval of 15 seconds between activations.

[0059] Demolding and curing: When the concrete reaches the demolding strength, remove the bolts used to fix the pre-embedded channel 300 through the channel fixing holes, then demold according to the trolley demolding procedure, retrieve the formwork for demolding, and do the subsequent curing work.

[0060] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A construction method for pre-embedded channels for overhead contact lines in tunnels, characterized in that, Includes a secondary lining trolley (100) that slides inside the tunnel and a positioning fixture (200) that can be detachably connected to the secondary lining trolley (100). A gap is left between the tunnel and the secondary lining trolley (100) for secondary lining construction, and the secondary lining is constructed in sections. The construction method includes the following steps: Channel fixing holes are made on the template of the secondary lining trolley (100); The steel reinforcement of the secondary lining is fabricated and installed, and the position of the steel mesh is adjusted to form an installation groove for the pre-embedded channel (300) anchor rod to pass through; The secondary lining trolley (100) moves, and the secondary lining trolley (100) raises and lowers the template through the lifting cylinder, forming a gap between the template of the secondary lining trolley (100) and the lining steel reinforcement of the secondary lining. The positioning fixtures (200) are installed. Two positioning fixtures (200) are spaced apart on the lining trolley (100). The positioning fixtures (200) include a fixed module (210) and a sliding module (220). The fixed module (210) includes a fixed seat (211) and a support plate (212). The fixed seat (211) has two opposite ends, one end of which is fixedly connected to the end of the lining trolley (100), and the other end is connected to the support plate (212). The top surface of the support plate (212) extends above the top surface of the lining trolley (100). The sliding module... The block (220) includes a sliding sleeve (221) and a moving beam (222). The outer periphery of the sliding sleeve (221) is fixed to the top surface of the support plate (212). The inner periphery of the sliding sleeve (221) is provided with a sliding hole adapted to the moving beam (222). The moving beam (222) passes through the sliding hole and can slide back and forth along the sliding hole. One end of the moving beam (222) is the working end located above the secondary lining trolley (100). The working end of the moving beam (222) is provided with a push-pull rod (201) for abutting the pre-embedded channel (300). The installation of the pre-embedded channel (300) includes the following steps: There is no need to move the secondary lining trolley (100), and the pre-embedded channel (300) is placed on the top surface of the secondary lining trolley (100); The positioning fixture (200) abuts against the anchor rod of the pre-embedded channel (300) via the push-pull rod (201); Push and pull the moving beam (222) to move the embedded channel (300) along the top surface of the secondary lining trolley (100) until the embedded channel (300) moves to the channel fixing hole; Adjust and fix the pre-embedded channel (300); Secondary lining construction.

2. The construction method for pre-embedded contact wire channels in tunnels according to claim 1, characterized in that, The sliding hole is provided with several sliding groups arranged at intervals along the axial direction of the sliding hole. Each sliding group includes several sliding wheels (202) evenly distributed around the circumference of the sliding hole. Correspondingly, the sliding hole is connected to the moving beam (222) through the sliding wheels (202).

3. The construction method for pre-embedded contact wire channels in tunnels according to claim 1, characterized in that, The support plate (212) is provided with a rotating shaft (203), a handle (204) and a transmission gear (205). The rotating shaft (203) is rotatably mounted on the support plate (212). The end of the rotating shaft (203) passes through the outside of the support plate (212) and is connected to the handle (204). The middle part of the rotating shaft (203) is located inside the support plate (212) and is connected to the transmission gear (205). Accordingly, the movable beam (222) is provided with a transmission chain meshing with the transmission gear (205), and the support plate (212) and the sliding sleeve (221) are provided with transmission grooves for connecting the sliding hole.

4. The construction method for pre-embedded contact wire channels in tunnels according to claim 1, characterized in that, The secondary lining trolley (100) is equipped with a movable cover plate located below the channel fixing hole; The movable cover plate includes a first base (401), a second base (402), a cover plate body (403), and a fixing rod (404). The first base (401) and the second base (402) are arranged opposite to each other and are located on both sides of the channel fixing hole. One of the first base (401) and the second base (402) is rotatably connected to the cover plate body (403), and the other is rotatably connected to the fixing rod (404). The end of the cover plate body (403) facing the fixing rod (404) is provided with a locking groove (405) adapted to the fixing rod (404). The outer surface of the cover plate body (403) facing the channel fixing hole is provided with a sealing block (406), which is used to seal the channel fixing hole. The fixing rod (404) is constructed as a screw rod, and a matching locking nut (407) is provided on the screw rod.

5. The construction method for pre-embedded contact wire channels in tunnels according to claim 1, characterized in that, In the second step of the reinforcement fabrication and installation, the position of the reinforcement mesh is adjusted to form an installation groove for the pre-embedded channel (300) anchor rod to pass through.

6. The construction method for pre-embedded contact wire channels in tunnels according to claim 1, characterized in that, Step two lining construction includes the following steps: Positioning and sealing the ends of the secondary lining trolley (100); Pour concrete; Demolding and curing.

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