A method for installing a railway tunnel external channel structure

Abstract

The present application relates to railway tunnel construction technical field, and disclose a kind of installation method of railway tunnel external channel structure, comprising: step S1, fixed aerial work platform;Step S2, reinforcement detection and mark the steel plate and channel overall position;Step S3, preliminary fixation the steel plate and channel overall;Step S4, drilling is carried out at the through hole on the steel plate;Step S5, hole cleaning and hole checking;Step S6, glue is injected into hole;Step S7, install the rear anchor bolt.The present application improves the installation quality of channel, ensures railway safe operation.

Description

Technical Field

[0001] This invention relates to the field of railway tunnel construction technology, specifically to a method for installing an external channel structure in a railway tunnel. Background Technology

[0002] Railways, as a high-speed, high-capacity, and relatively low-cost infrastructure, are under large-scale construction in my country. Tunnels are a key project in railway construction, and the installation of the overhead contact system in tunnels is an important task to ensure the safe operation of railways. Generally, the built-in contact system channels are installed simultaneously during the construction of the main tunnel structure. However, due to design omissions, installation quality problems, and other reasons, the original built-in channels have become unusable.

[0003] Therefore, an installation method and installation procedure for an external channel structure in a railway tunnel are provided. Summary of the Invention

[0004] The purpose of this invention is to overcome the existing defects and provide an installation method for an external duct structure in railway tunnels, which improves the installation quality of the duct and ensures the safe operation of the railway.

[0005] The technical solution to achieve the above objectives is:

[0006] An installation method for an external channel structure in a railway tunnel, the external channel structure of the railway tunnel includes multiple post-anchor bolts and two channels, multiple steel plates are welded between the two channels, and four through holes are symmetrically opened on each steel plate. The post-anchor bolts pass through the through holes and are fixed in the tunnel lining concrete. A washer, a hexagonal nut and a hexagonal lock nut are connected in sequence on the post-anchor bolt outside the through holes.

[0007] Installation methods include:

[0008] Step S1: Secure the aerial work platform;

[0009] Step S2: The steel reinforcement is detected and the overall position of the steel plate and channel is marked;

[0010] Step S3: Initially fix the steel plate and the channel as a whole;

[0011] Step S4: Drill holes at the through holes on the steel plate;

[0012] Step S5: Clean and inspect the hole;

[0013] Step S6: Inject adhesive into the hole;

[0014] Step S7: Install the rear anchor bolt;

[0015] Step S8: Perform a pull-out test on the post-installed anchor bolt;

[0016] Step S9: Fill in the construction concealed works record;

[0017] Step S10: Install and secure the steel plate and channel as a whole.

[0018] Preferred,

[0019] In step S1, the construction workers install the aerial work platform in the designated position, fix it with supports, and arrange dedicated personnel to monitor the stability of the aerial work platform.

[0020] Step S2 includes:

[0021] Step S21, Reinforcing bar detection, detecting the location of the tunnel lining concrete corresponding to the through hole in the steel plate;

[0022] Step S22: Mark the positions of the steel plate and the channel. The technicians measure the tunnel lining concrete according to the technical data provided, and make fine adjustments to the positions of the steel plate and the channel according to the position of the rebar detection. Mark 4 points on the center line of the channel group outside the channel with red paint.

[0023] In step S3, the steel plate and channel are placed in the designated position, and the on-site personnel use a plumb bob and steel ruler to check whether the position is correct. Using the four marked points, the steel plate and channel are initially fixed on the tunnel lining concrete.

[0024] In step S4, an electric hammer is used as the drilling tool. The hammer is aligned with the through hole, and after drilling to the designed depth, the drill bit is withdrawn, the hammer is turned off, and the next hole is moved in. The results are recorded.

[0025] Preferred,

[0026] Step S5 includes:

[0027] Step S51: Clean the hole. Use a brush to remove loose concrete debris from the inner wall of the hole. Clean the hole by blowing 3 times, brushing 3 times, and blowing 3 times again. Use cotton yarn to absorb the moisture in the hole.

[0028] Step S52: Inspect the hole. The drilling depth shall not be less than 130mm, the effective anchoring depth shall not be less than 125mm, the depth error shall be controlled within ±2mm, the verticality deviation shall be 1°, remove debris, water and oil stains from the hole, clean it thoroughly, clearly see the anchoring length mark of the post-installed anchor, insert the post-installed anchor into the hole, and check the unobstructedness and drilling depth of the hole.

[0029] In step S6, glue is injected into the hole using a glue gun. The first glue should be applied 10cm ahead, and the glue that comes out afterward should be a uniformly mixed color. Then, the glue is injected from the bottom of the hole.

[0030] In step S7, the post-installed anchor bolt is manually rotated and pressed into the hole according to the required anchoring depth until a small amount of adhesive overflows. The installation is then complete. If no adhesive overflows, the post-installed anchor bolt is immediately pulled out within the initial setting time of the anchoring adhesive, and the adhesive is inserted again. The post-installed anchor bolt is then rotated and reinserted until a small amount of adhesive overflows. Each screw has an installation mark line. If the hole is too deep, the effective embedment depth of the post-installed anchor bolt is ensured while also ensuring the exposed length of the post-installed anchor bolt. The exposed length of the post-installed anchor bolt after installation is not greater than the height of the steel plate and the channel. After tightening, the exposed thread is not less than three thread pitches.

[0031] Preferred,

[0032] In step S8, after the anchoring adhesive has solidified, a pull-out test is performed on the post-installed anchor bolt. On the basis of checking that the appearance quality of the anchor bolts in the batch is qualified, a 100% non-destructive pull-out test is performed on the anchor bolt. The sampling for on-site destructive testing should be selected from locations that are easy to repair and replant, and locations where equipment is installed should not be selected.

[0033] In step S9, after the pull-out test is completed, the exposed part of the external anchor bolt is cleaned with a brush; the inclination and exposure of the exposed length of the external anchor bolt relative to the hole wall are measured and recorded, and a concealed works record is made. Tests and reports are collected as required.

[0034] In step S10, each of the through holes on the steel plate is aligned with the post-anchor bolt, and the washer, hexagonal nut and hexagonal lock nut are tightened to the post-anchor bolt in sequence using a torque wrench. Anti-loosening adhesive is then applied. After completion, the tools and equipment at the construction site and the injected chemical agent package are cleaned up, and the operating platform is transferred to the next suspension point.

[0035] Preferably, the number of steel plates is 8, the steel plate size is 620×100×16mm, the steel plate material is Q345B, and the through hole size is φ19×40mm.

[0036] Preferably, the channel is made of Q345B material, has a length of 2500mm, and is compatible with the contact wire.

[0037] Preferably, the steel plate and the channel are joined by fillet welds with a weld height of not less than 6 mm and a welding quality level of Grade 1; after welding, the channel and the steel plate are hot-dip galvanized with Grade 3 galvanizing and a zinc coating thickness of not less than 80 μm.

[0038] Preferably, the post-installed anchor bolt is an inverted conical anchor rod with Grade 1 galvanization, and the material performance grade is 40Cr, 8.8, and Grade 1 hot-dip galvanized.

[0039] Preferably, the hexagonal nut and the hexagonal locking nut are coated with anti-loosening adhesive on their outer sides; both the hexagonal nut and the hexagonal locking nut are made of 45# steel, with grade 1 hot-dip galvanization and a material performance grade of 8; the washer is made of Q235B material, with grade 3 hot-dip galvanization.

[0040] The beneficial effects of this invention are as follows: After the tunnel lining is completed, holes are drilled at the corresponding positions, and post-installed anchor bolts are fixed in the tunnel lining concrete by injection of adhesive. The steel plate and channel are bent into an arc shape according to the tunnel cross section, and the steel plate and channel are fixed to the tunnel lining concrete by post-installed anchor bolts, washers, hexagonal nuts and hexagonal lock nuts. This structure improves the installation quality of the channel, facilitates construction, and ensures the safe operation of the railway. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of an external channel structure for a railway tunnel according to the present invention;

[0042] Figure 2 This is a bottom view of an external channel structure for a railway tunnel according to the present invention;

[0043] Figure 3 This is a flowchart of an installation method based on an external channel structure for railway tunnels according to the present invention;

[0044] Figure 4 This is a flowchart of the process for detecting and marking the overall position of the steel plate and channel in this invention;

[0045] Figure 5 This is a flowchart of the hole cleaning and inspection process in this invention.

[0046] In the diagram: 1. Post-installed anchor bolt; 2. Washer; 3. Hexagonal nut; 4. Hexagonal lock nut; 5. Steel plate; 6. Channel; 7. Tunnel lining concrete. Detailed Implementation

[0047] The technical solution of the present invention will now be clearly and completely described in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0048] The invention will now be further described with reference to the accompanying drawings.

[0049] like Figure 1 ,2 The external channel structure of the railway tunnel includes multiple post-anchor bolts 1 and two channels 6. Multiple steel plates 5 are welded between the two channels 6. Each steel plate 5 has four symmetrical through holes. The post-anchor bolts 1 pass through these through holes and are fixed within the tunnel lining concrete 7. Washers 2, hexagonal nuts 3, and hexagonal lock nuts 4 are sequentially connected to the post-anchor bolts 1 outside the through holes. The post-anchor bolts 1 are fixed within the tunnel lining concrete 7 by drilling and applying adhesive. The steel plates 5 and channels 6 are bent into an arc shape according to the tunnel cross-section. The steel plates 5 and channels 6 are tightly fixed to the tunnel lining concrete 7 by the post-anchor bolts 1, washers 2, hexagonal nuts 3, and hexagonal lock nuts 4. The long side of the channel 6 is perpendicular to the tunnel centerline.

[0050] In this embodiment, there are 8 steel plates 5, each with a size of 620×100×16mm and made of Q345B material. The spacing between each steel plate 5 is 340mm. The through holes have a size of φ19×40mm and are located at 40mm, 180mm, 440mm, and 580mm from one end of the steel plate 5.

[0051] In this embodiment, the channel 6 is made of Q345B material and has a length of 2500mm. The channel 6 is adapted to the contact wire, and the distance between two channels 6 is 400mm.

[0052] In this embodiment, a fillet weld is used between the steel plate 5 and the channel 6, with a weld height of not less than 6mm and a welding quality level of Grade 1; after the channel 6 and the steel plate 5 are welded, they are hot-dip galvanized at Grade 3 with a galvanizing thickness of not less than 80μm.

[0053] In the embodiment, the post-installed anchor bolt 1 is an inverted cone-shaped anchor rod with Grade 1 galvanization, and the material performance grade is 40Cr, 8.8 grade, and Grade 1 hot-dip galvanized.

[0054] In this embodiment, the hexagonal nut 3 and the hexagonal locking nut 4 are fixed to the rear anchor bolt 1 and coated with anti-loosening adhesive. Both the hexagonal nut 3 and the hexagonal locking nut 4 are made of 45# steel, with grade 1 hot-dip galvanization and a material performance grade of 8. The gasket 2 is made of Q235B material and has grade 3 hot-dip galvanization.

[0055] In this embodiment, the external anchor bolt 1 is fixed to the tunnel lining concrete 7 by anchoring adhesive, and then the steel plate 5 and the channel 6 are installed. After the external anchor bolt 1 is fitted with a washer 2, the hexagonal nut 3 and the hexagonal lock nut 4 are finally tightened. The anchoring adhesive is an organic modified vinyl ester type anchoring adhesive. After the post-anchor bolt 1 is fixed, the exposed thread length is not less than three pitches. The post-anchor bolt 1 is tightened with a torque wrench to ensure that the torque meets the design requirements.

[0056] like Figure 1-5 The installation method of the external channel structure for railway tunnels includes:

[0057] Step S1: Secure the aerial work platform.

[0058] Construction workers will install the aerial work platform in the designated location and secure it with supports to ensure that the bottom of the aerial work platform is firmly connected to the foundation support surface and that there is no relative movement. During the construction process, in order to ensure the safety and stability of the aerial work platform, dedicated personnel will be assigned to monitor its stability.

[0059] Step S2: The steel reinforcement is detected and the overall position of the steel plate 5 and the channel 6 is marked.

[0060] Step S21, Reinforcing bar detection: Detection is performed at the location of the tunnel lining concrete 7 corresponding to the through hole in the steel plate 5.

[0061] Step S22: Mark the positions of steel plate 5 and channel 6. The technicians measure the tunnel lining concrete 7 according to the data provided by the technicians, and make fine adjustments to the positions of steel plate 5 and channel 6 according to the position of the reinforcing bar detection. Mark 4 points on the center line of the corresponding channel 6 group outside the channel 6 with red paint.

[0062] Step S3: Initially fix the steel plate 5 and the channel 6 as a whole.

[0063] Place the steel plate 5 and the channel 6 in the designated position. On-site personnel use a plumb bob and steel ruler to check whether the position is correct. Using the four marked points, the steel plate 5 and the channel 6 are initially fixed to the tunnel lining concrete 7.

[0064] Step S4: Drill holes at the through holes on the steel plate 5.

[0065] The drilling tool used is an electric hammer. Align it with the through hole and drill to the designed depth. Then, withdraw the drill bit, turn off the electric hammer, move to the next hole, and make a record. Use an 18mm diameter drill bit to drill the post-installed anchor bolt 1 to a depth of not less than 130mm, with an effective anchoring depth of not less than 125mm.

[0066] Step S5: Clean and inspect the hole.

[0067] Step S51: Clean the hole. Use a brush to remove loose concrete debris from the inner wall of the hole. Clean the hole in the order of blowing 3 times, brushing 3 times, and blowing 3 times again. Use cotton yarn to absorb the moisture in the hole. Only after the hole is dry can the adhesive be injected and the post-installed anchor bolt 1 be installed. When cleaning the hole: start from the bottom of the hole and brush up and down 3 times. If the hole is deep, an extended handle must be used to ensure that the brush reaches the bottom of the hole. During the brushing process, ensure that the brush makes good contact with the hole and there is friction. Otherwise, the brush should be replaced. The hole wall can be damp, but it must be ensured that there is no standing water in the hole. If the installation of the reinforcing bar cannot be carried out immediately after cleaning the hole, the hole should be sealed with a protective cover. Cleaning should be carried out again before the next construction.

[0068] Step S52: Inspect the hole. The drilling depth should be no less than 130mm, the effective anchoring depth should be no less than 125mm, the depth error should be controlled within ±2mm, and the verticality deviation should be 1°. Remove debris, water, and oil stains from the hole. After cleaning the hole, carefully observe the anchoring length mark of the post-installed anchor 1, insert the post-installed anchor 1 into the hole, and check the unobstructed flow and drilling depth of the hole.

[0069] Step S6: Inject adhesive into the hole.

[0070] Use a caulking gun to inject adhesive into the hole. The first 10cm of adhesive should be injected, followed by a uniformly mixed color. Inject adhesive from the bottom of the hole. When using the caulking gun, be careful not to pull the trigger too frequently, as the gun will automatically pressurize. Excessive pressure will prevent the gun from releasing properly and could damage it. Pull the trigger once every 3 seconds. Frequent trigger pulling will damage the gun and increase the workload for the operator. Inject to 2 / 3 of the hole depth, ensuring it is fully filled. After inserting the rear anchor bolt 1 into the bottom of the hole, a small amount of anchoring adhesive should overflow from the hole onto the concrete surface.

[0071] Step S7, install the rear anchor bolt 1.

[0072] Post-installed anchor bolt 1 is manually rotated and pressed into the hole to the required anchoring depth until a small amount of adhesive overflows. Installation is complete. If no adhesive overflows, immediately pull out post-installed anchor bolt 1 within the initial setting time of the anchoring adhesive, continue to insert adhesive, and then rotate and reinsert post-installed anchor bolt 1 until a small amount of adhesive overflows. Each screw has an installation mark line. If the hole is too deep, ensure the effective embedment depth of post-installed anchor bolt 1 while ensuring the exposed length of post-installed anchor bolt 1. The exposed length of post-installed anchor bolt 1 after installation should not exceed the height of steel plate 5 and channel 6. After tightening, the exposed thread should be no less than three thread pitches.

[0073] Step S8: Perform a pull-out test on the post-installed anchor bolt 1.

[0074] After the anchoring adhesive has solidified, a pull-out test is performed on the post-installed anchor 1. On the basis of ensuring that the appearance quality of the anchors in this batch is qualified, a 100% non-destructive pull-out test is performed on the post-installed anchor 1. For on-site destructive testing, the sampling should be selected from locations that are easy to repair and replant, and locations where equipment is installed should not be selected.

[0075] Step S9: Fill in the construction concealed works record.

[0076] After the pull-out test is completed, clean the exposed part of the external anchor bolt 1 with a brush; measure and record the inclination and exposure of the exposed length of the external anchor bolt 1 relative to the hole wall, and make a record of the concealed works; and collect the test and report as required.

[0077] Step S10: Install and secure the steel plate 5 and the channel 6 as a whole.

[0078] Align each through hole on the steel plate 5 with the rear anchor bolt 1, and use a torque wrench to tighten the washer 2, hex nut 3 and hex lock nut 4 to the rear anchor bolt 1 in sequence. Apply anti-loosening adhesive to the outside of the hex nut 3 and hex lock nut 4. After completion, clean up the construction site tools, chemical agent bags and other waste to avoid contaminating the track bed. Finally, move the operating platform to the next suspension point.

[0079] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An installation method for an external channel structure in a railway tunnel, the external channel structure comprising multiple post-anchor bolts (1) and two channels (6), wherein multiple steel plates (5) are welded between the two channels (6), and each steel plate (5) has four through holes symmetrically opened thereon, the post-anchor bolts (1) passing through the through holes and fixed inside the tunnel lining concrete (7), and a washer (2), a hexagonal nut (3) and a hexagonal lock nut (4) are sequentially connected to the post-anchor bolts (1) outside the through holes; characterized in that, Installation methods include: Step S1: Secure the aerial work platform; Step S2: The steel reinforcement is probed and the overall position of the steel plate (5) and the channel (6) is marked; Step S3: Initially fix the steel plate (5) and the channel (6) as a whole; Step S4: Drill holes at the through holes on the steel plate (5); Step S5: Clean and inspect the hole; Step S6: Inject adhesive into the hole; Step S7, install the rear anchor bolt (1); Step S8: Perform a pull-out test on the post-installed anchor bolt (1); Step S9: Fill in the construction concealed works record; Step S10: Install and fix the steel plate (5) and the channel (6) as a whole; Step S2 includes: Step S21, Reinforcing bar detection, detection is performed at the location of the tunnel lining concrete (7) corresponding to the through hole in the steel plate (5); Step S22: Mark the positions of the steel plate (5) and the channel (6). The technicians measure the tunnel lining concrete (7) according to the technical information provided, and make fine adjustments to the positions of the steel plate (5) and the channel (6) according to the position of the reinforcing bar detection. Mark 4 points on the center line of the channel (6) outside the channel (6) with red paint. In step S3, the steel plate (5) and the channel (6) are placed in the designated position. On-site personnel use a plumb bob and a steel ruler to check whether the position is correct. Using the four marked points, the steel plate (5) and the channel (6) are initially fixed on the tunnel lining concrete (7). Step S5 includes: Step S51: Clean the hole. Use a brush to remove loose concrete debris from the inner wall of the hole. Clean the hole by blowing 3 times, brushing 3 times, and blowing 3 times again. Use cotton yarn to absorb the moisture in the hole. Step S52, inspect the hole. The drilling depth shall not be less than 130mm, the effective anchoring depth shall not be less than 125mm, the depth error shall be controlled within ±2mm, the verticality deviation shall be 1°, remove debris, water and oil stains from the hole, clean the hole, and clearly see the anchoring length mark of the post-installed anchor (1). Insert the post-installed anchor (1) into the hole and check the unobstructedness and drilling depth of the hole. In step S6, glue is injected into the hole using a glue gun. The first glue should be applied 10cm ahead, and the glue that comes out afterward should be a uniformly mixed color. Then, the glue is injected from the bottom of the hole. In step S7, the post-anchor (1) is manually rotated and pressed into the hole according to the required anchoring depth until a small amount of adhesive overflows. The installation is then complete. If no adhesive overflows, the post-anchor (1) is immediately pulled out within the initial setting time of the anchoring adhesive. The adhesive is then inserted again and rotated until a small amount of adhesive overflows. Each screw has an installation mark line. If the hole is too deep, the effective burial depth of the post-anchor (1) is ensured while ensuring the exposed length of the post-anchor (1). The exposed length of the post-anchor (1) after installation is not greater than the height of the steel plate (5) and the channel (6). After locking, the exposed thread is not less than three pitches. In step S8, after the anchoring adhesive has solidified, a pull-out test is performed on the post-installed anchor (1). On the basis of checking that the appearance quality of the post-installed anchor (1) is qualified, a 100% non-destructive pull-out test is performed on the anchor. The sampling for on-site destructive testing should be selected from locations that are easy to repair and replant, and locations where equipment is installed should not be selected. In step S9, after the pull-out test is completed, the exposed part of the post-installed anchor bolt (1) is cleaned with a brush; the inclination and exposure of the exposed length of the post-installed anchor bolt (1) relative to the hole wall are measured, recorded and the concealed works record is made, and the test and report are collected as required. In step S10, each of the through holes on the steel plate (5) is aligned with the rear anchor bolt (1), and the washer (2), hexagonal nut (3) and hexagonal lock nut (4) are tightened to the rear anchor bolt (1) in sequence using a torque wrench. Anti-loosening adhesive is applied. After completion, the construction site tools and equipment and the injected chemical agent package are cleaned up, and the operating platform is transferred to the next suspension point.

2. The installation method of the external channel structure for railway tunnels according to claim 1, characterized in that, In step S1, the construction workers install the aerial work platform in the designated location, fix it with supports, and arrange dedicated personnel to monitor the stability of the aerial work platform.

3. The installation method of the external channel structure for railway tunnels according to claim 1, characterized in that, In step S4, an electric hammer is used as the drilling tool. The hammer is aligned with the through hole, and after drilling to the designed depth, the drill bit is withdrawn, the hammer is turned off, and the next hole is moved in. The results are recorded.

4. The installation method of the external channel structure for railway tunnels according to claim 1, characterized in that, The number of steel plates (5) is 8, the size of the steel plates (5) is 620×100×16mm, the material is Q345B, and the size of the through hole is φ19×40mm.

5. The installation method of the external channel structure for railway tunnels according to claim 1, characterized in that, The channel (6) is made of Q345B material and has a length of 2500mm. The channel (6) is adapted to the contact wire.

6. The installation method of the external channel structure for railway tunnels according to claim 1, characterized in that, The steel plate (5) and the channel (6) are joined by fillet welds with a weld height of not less than 6 mm and a welding quality grade of 1. After welding, the channel (6) and the steel plate (5) are hot-dip galvanized with a grade 3 galvanizing and a galvanizing thickness of not less than 80 μm.

7. The installation method of the external channel structure for railway tunnels according to claim 1, characterized in that, The rear anchor bolt (1) is an inverted cone-shaped anchor rod with Grade 1 galvanization, and the material performance grade is 40Cr, 8.8 grade, and Grade 1 hot-dip galvanized.

8. The installation method of the external channel structure for railway tunnels according to claim 1, characterized in that, The hexagonal nut (3) and the hexagonal locking nut (4) are coated with anti-loosening adhesive on the outside; the hexagonal nut (3) and the hexagonal locking nut (4) are both made of 45# steel, grade 1 hot-dip galvanized, and the material performance grade is grade 8; the washer (2) is made of Q235B material, grade 3 hot-dip galvanized.

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