A construction method for preventing leakage in expansion joints of coal conveyor bridge floors.

Abstract

This invention discloses a construction method for preventing leakage at expansion joints in the floor slabs of coal conveyor trestle bridges. The steps are as follows: S100 Base cleaning; S200 Root roughening and wetting: The floor slab in the area of ​​the inverted curb is roughened using a roughening device, and the base is moistened with water after roughening; S300 Inverted curb positioning and layout: Using the center line of the belt conveyor and the edge line of the expansion joint as a reference, the center position, pipe opening elevation, and direction of the pre-embedded steel pipe are accurately marked; S400 Reinforcement binding: The reinforcing steel bars of the inverted curb are bound according to the design requirements; S500 Positioning and reinforcement of pre-embedded steel pipes; S600 Formwork erection and acceptance: Standardized formwork is erected along the outline of the inverted curb; S700 Concrete pouring and vibration: Plain concrete with C30 and 3% waterproofing powder is poured in layers and fully vibrated using an immersion vibrator; S800 Formwork removal; S900 Concrete curing. This method effectively improves the leakage prevention strength of the expansion joints in the trestle bridge and extends their service life.

Description

Technical Field

[0001] This invention relates to the field of expansion joint technology for trestle bridges, specifically a construction method for preventing leakage in expansion joints of coal conveying trestle bridge floors. Background Technology

[0002] Coal conveyor bridges are specialized overhead corridors used in mines, power plants, and other locations for transporting coal. They typically employ large-span, enclosed structures combining steel trusses and supports, serving as core supporting facilities for coal transfer. Due to temperature changes, structural settlement, and load effects, the bridge as a whole will expand and contract, shifting. Therefore, expansion joints are necessary on the bridge deck and at the junctions between the bridge and the transfer station to release structural stress and prevent component cracking and damage. However, coal conveyor bridges are generally equipped with automatic water flushing systems to remove coal dust. Combined with the moisture content of raw coal, a large amount of water easily accumulates at the expansion joints, causing water retention and impurity buildup. This can damage the original waterproofing layer, leading to leakage problems. Therefore, the expansion joints in the floor slabs of coal conveyor bridges require leak-proofing treatment.

[0003] In the prior art, the invention patent with application number CN202411827612.8 discloses an expansion joint of a coal conveyor belt trestle and its construction method. The expansion joint of the trestle includes, from bottom to top: a bottom layer, which is a U-shaped pocket made of virgin polyester fiber reinforced cloth impregnated with two layers of LEAC acrylic polymer cement waterproof coating; an insulation layer, which includes a rubber surface filled in the expansion joint and a waterproof coating emulsion injected into the gap between the rubber surface and the expansion joint; a waterproof layer, which includes a two-layer LEAC acrylic polymer cement waterproof coating layer and a LEAC waterproof emulsion layer; and a protective layer, which is made of aluminum foil fiberglass cloth or steel plate with the same width as the expansion joint.

[0004] In the prior art, the invention patent with application number CN202110127853.1 discloses a trestle expansion joint structure and its construction method, including a first trestle structure main body and a second trestle structure main body, an expansion joint is formed between the first trestle structure main body and the second trestle structure main body, and a profiled steel plate bottom mold is provided at the bottom of both the first trestle structure main body and the second trestle structure main body and the profiled steel plate bottom mold respectively. Two V-shaped stainless steel plates are respectively provided between the first trestle structure main body and the profiled steel plate bottom mold and the second trestle structure main body and the profiled steel plate bottom mold. The ends of the two V-shaped stainless steel plates are located inside the expansion joint and are integrally connected.

[0005] In the aforementioned patented solutions, one construction method involves using two layers of LEAC acrylic polymer cement waterproof coating and a LEAC waterproof emulsion layer to ensure the waterproof layer has sufficient adhesion and flexibility, allowing it to withstand deformation of the floor and expansion joints, and providing sufficient tensile and torsional strength without damage during large deformations. Another construction method involves placing two V-shaped stainless steel plates between the main body of the first trestle structure and the profiled steel sheet bottom mold, and between the main body of the second trestle structure and the profiled steel sheet bottom mold, to improve corrosion resistance and thus enhance the anti-leakage effect of the trestle deformation structure.

[0006] However, both of the above-mentioned methods for preventing leakage at the expansion joints of trestle bridges aim to improve the leakage resistance of the expansion joints and extend their service life. When the trestle bridge is in use, the flushing water will still accumulate at the expansion joints, causing water retention and debris buildup. Ultimately, the leakage resistance of the trestle bridge is limited. Even with excellent waterproof and anti-corrosion structural performance, it is difficult to completely resist the long-term erosion of accumulated water and debris. In the long run, there will still be a risk of leakage and component corrosion, which needs further improvement. Summary of the Invention

[0007] The purpose of this invention is to provide a construction method for preventing leakage at the expansion joints of coal conveyor trestle floors. The aim is to improve existing construction methods for preventing leakage at expansion joints of trestle floors, which all aim to increase the leakage resistance of the expansion joints and extend their service life. However, the leakage resistance of trestle floors is ultimately limited. Even with excellent waterproof and anti-corrosion structural performance, it is difficult to completely resist the long-term erosion of accumulated water and debris. Over time, leakage and component corrosion risks will still occur.

[0008] This invention is implemented as follows: a construction method for preventing leakage at expansion joints in the floor slabs of coal conveyor bridges, the specific steps of which are as follows: S100. A construction method for preventing leakage at expansion joints in the floor slab of a coal conveyor bridge, characterized by the following specific steps: S100. Base cleaning: Clean the surface of the base layer of the floor slab at the front end of the expansion joint, removing floating dust, coal dust, debris, and loose concrete to ensure that the base layer is clean and free of oil stains. S200, Root roughening and wetting: The floor slab in the inverted curb area is roughened using a roughening device to a depth of 5mm-10mm. After roughening, water is sprinkled to moisten the base layer to prevent the concrete from losing water and cracking. S300, Reverse Slope Positioning and Laying Out: Using the center line of the belt conveyor and the edge line of the expansion joint as the benchmark, use measuring instruments to pop out the inner and outer edge lines, start and end lines, and top surface elevation lines of the reverse slope. At the same time, accurately mark the center position, pipe opening elevation and direction of the pre-embedded steel pipe. After the laying out is completed, check and accept it. S400, Reinforcement Binding: Bind the reinforcing bars for the inverted curb structure according to the design requirements, and strictly control the thickness of the concrete cover for the reinforcing bars in accordance with the specifications; S500, Pre-embedded steel pipe positioning and reinforcement: Place the drainage steel pipe according to the marked points, adjust the slope, elevation and angle of the steel pipe, and use steel reinforcement supports for temporary reinforcement to prevent the steel pipe from shifting when pouring concrete; after completion, double-check the position of the steel pipe; S600, Formwork Erection and Acceptance: Erect the standard formwork along the contour of the inverted embankment. The formwork should be tightly spliced ​​and firmly supported. Seal the gaps to prevent grout leakage. Check the verticality, cross-sectional dimensions, elevation, and position of the steel pipes of the formwork. Only after the formwork passes the acceptance inspection can the next process be carried out. S700 Concrete Pouring and Vibration: C30 plain concrete with 3% waterproof powder is poured in layers and vibrated thoroughly with an immersion vibrator to ensure the concrete is dense. Special attention is paid to vibrating the base of the steel pipe and the base of the inverted curb to prevent honeycomb, pitting, and voids. After pouring, the top surface of the inverted curb is finished. S800 Formwork Removal: Remove the formwork when the concrete strength reaches more than 50% of the design strength. Avoid collisions or prying of the inverted wall body during the removal process. S900 Concrete curing: After demolding, cover the surface of the inverted retaining wall with geotextile and spray water for curing. The curing period shall not be less than 7 days to ensure the waterproof performance and structural strength of the concrete.

[0009] The chiseling device in step S200 includes a movable support, a chiseling equipment housing, and a telescopic device. Multiple connecting rods are rotatably mounted on both sides of the chiseling equipment housing, and these connecting rods are all rotatably mounted on the movable support. One end of the telescopic device is rotatably mounted on the movable support, and the other end is rotatably mounted on the upper surface of the chiseling equipment housing. The chiseling equipment housing is driven by the telescopic device and performs arc-shaped lifting and lowering movements with the connecting rods as the radius. Multiple chiseling structures are installed side-by-side at the lower end of the chiseling equipment housing. Multiple chiseling rods are sequentially arranged along the length of each chiseling structure, with the rods pointing downwards and extending out of the chiseling equipment housing.

[0010] The movable support includes support legs, and support legs are provided at the four corners of the lower end face of the movable support. The lower ends of the multiple support legs are provided with movable wheels.

[0011] The movable support is equipped with mounting rods corresponding to each of the connecting rods, and each mounting rod is equipped with a first rotating mounting head. The side of the roughening equipment housing is equipped with a second rotating mounting head corresponding to each of the connecting rods. One end of each connecting rod is rotatably mounted on the first rotating mounting head, and the other end is rotatably mounted on the second rotating mounting head.

[0012] The upper end face of the shell of the chiseling equipment is provided with a first rotating connecting seat, and the telescopic end of the telescopic device is rotatably mounted on the first rotating connecting seat.

[0013] Additionally, an adjustment plate is included. Inside the shell of the chiseling equipment, there are horizontally arranged rotating mounting rods corresponding to each chiseling structure. The chiseling structures are rotatably mounted on the rotating mounting rods. The adjustment plate is slidably mounted inside the shell of the chiseling equipment along a direction perpendicular to the rotating mounting rods and is located above the multiple chiseling structures. Vertically and elastically slidingly arranged on the adjustment plate are rotating compensation rods corresponding to each chiseling structure. The lower end of the rotating compensation rod is rotatably mounted on the corresponding chiseling structure.

[0014] The chiseling structure includes an installation tube, which is fitted onto a rotating installation rod, and the chisel rod is fixedly mounted on the installation tube; the upper end of the rotating compensation rod is provided with an abutment round head, and the lower end is provided with a rotating connector head; a second rotating connector seat is provided on the installation tube, and the rotating connector head is rotatably mounted on the second rotating connector seat.

[0015] The upper inner surface of the shell of the chiseling device is provided with a mounting groove corresponding to the abutting round head. A pushing inclined surface is provided in the mounting groove, and the abutting round head abuts against the pushing inclined surface. A spring is fitted on the rotating compensating rod, and a mounting hole is provided on the adjusting plate. The rotating compensating rod is inserted into the mounting hole through the spring, and the spring abuts against the upper surface of the adjusting plate.

[0016] The adjusting plate includes a sliding sleeve, and a guide slide rod is provided inside the shell of the chiseling equipment. The sliding sleeve is slidably fitted onto the guide slide rod.

[0017] It also includes an adjusting screw, a rotating chuck at the end of the adjusting plate, a threaded sleeve on the shell of the chiseling equipment, the adjusting screw being threadedly mounted on the threaded sleeve, with one end rotatably mounted in the rotating chuck, and the other end located outside the shell of the chiseling equipment and provided with a rotating handle.

[0018] Positive and beneficial effects: 1. This invention adds a waterproof concrete curb in the expansion joint area and pre-embeds a drainage steel pipe. This not only blocks the flushing water from the trestle water flushing system and the moisture in the raw coal outside the expansion joint, but also allows the water to be quickly discharged through the drainage steel pipe. This avoids the long-term accumulation and retention of water and coal slag impurities at the expansion joint, thereby avoiding the problem of long-term soaking, scouring, and corrosion of the waterproof layer.

[0019] 2. This invention uses a parallel four-bar linkage structure to drive the shell of the chiseling equipment to perform an arc-shaped lifting and lowering motion, achieving oblique chiseling of the concrete substrate and effectively improving the impact effect of the chisel rod on the floor slab base. Simultaneously, the device can flexibly adjust the tilt angle of the chiseling structure by adjusting the screw, adjusting plate, and rotating compensation rod. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the construction process of the present invention; Figure 2 This is a schematic diagram of the overall structure of the chiseling device of the present invention; Figure 3 This is a schematic diagram of the structure of the movable support of the present invention; Figure 4 This is a schematic diagram of the structure of the adjusting plate and the chiseling structure of the present invention installed on the shell of the chiseling equipment; Figure 5 This is a schematic diagram of the internal three-dimensional structure of the shell of the chiseling device of the present invention; Figure 6 This is a cross-sectional structural diagram of the shell of the chiseling device of the present invention; Figure 7 This is a three-dimensional structural diagram of the outer side of the shell of the chiseling device of the present invention; Figure 8 This is a three-dimensional structural diagram of the rotation compensation rod of the present invention mounted on the adjustment plate; Figure 9 This is a three-dimensional structural schematic diagram of the adjustment plate of the present invention; Figure 10 This is a schematic diagram of the rotating compensating rod of the present invention; Figure 11 This is a schematic diagram of the chiseling structure of the present invention; Figure 12 This is a schematic diagram of the anti-sill positioning of the present invention.

[0021] The diagram shows: 1. Movable support; 101. Support leg; 102. Mounting rod; 103. First rotating mounting head; 104. Moving wheel; 2. Telescopic device; 3. Scraped equipment housing; 301. Second rotating mounting head; 302. First rotating connecting seat; 303. Guide slide rod; 304. Mounting groove; 305. Rotating mounting rod; 306. Pushing inclined plane; 307. Threaded sleeve; 4. Connecting rod; 5. Counterweight; 6. Adjustment... Section plate; 601, sliding sleeve; 602, rotating clamp; 603, mounting hole; 7, roughening structure; 701, mounting pipe; 702, second rotating connecting seat; 703, chisel rod; 8, rotating compensating rod; 801, abutting round head; 802, rotating connecting head; 803, spring; 9, adjusting screw; 10, step area; 11, drainage direction; 12, center line; 13, reverse curb; 14, drainage steel pipe; 15, expansion joint. Detailed Implementation

[0022] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] The following description, in conjunction with the accompanying drawings and specific embodiments, provides further details: Example 1

[0024] like Figures 2-5 As shown, a chiseling device includes a movable support 1, a chiseling equipment housing 3, and a telescopic device 2. The movable support 1 includes support legs 101, with support legs 101 located at the four corners of the lower end face of the movable support 1. Multiple support legs 101 have wheels 104 at their lower ends. The telescopic device 2 is preferably an electric push rod, a hydraulic push rod, or a pneumatic push rod, serving as the power source for lifting the entire machine. Multiple connecting rods 4 are rotatably mounted on both sides of the chiseling equipment housing 3, and each connecting rod 4 is rotatably mounted on the movable support 1. The movable support 1 has mounting rods 102 corresponding to each connecting rod 4, and each mounting rod 102 has a first rotating mounting head 103. The side of the chiseling equipment housing 3 has a second rotating mounting head 301 corresponding to each connecting rod 4, with one end of each connecting rod 4 rotatably mounted on the first rotating mounting head 103 and the other end rotatably mounted on the second rotating mounting head 301. One end of the telescopic device 2 is rotatably mounted on the movable support 1, and the other end is rotatably mounted on the upper surface of the chiseling equipment housing 3. The chiseling equipment housing 3 is driven by the telescopic device 2 and moves in an arc with the connecting rod 4 as the radius. A first rotating connecting seat 302 is provided on the upper surface of the chiseling equipment housing 3, and the telescopic end of the telescopic device 2 is rotatably mounted on the first rotating connecting seat 302. Multiple chiseling structures 7 are installed side by side at the lower end of the chiseling equipment housing 3. Multiple chisel rods 703 are arranged sequentially along their length on each of the multiple chiseling structures 7. The multiple chisel rods 703 are arranged downward and extend out of the chiseling equipment housing 3. Both ends of the linkage 4 are hinged. One end is hinged to the first rotating mounting head 103, and the other end is hinged to the second rotating mounting head 301 on the side of the chiseling equipment housing. All linkages 4 are of the same length and arranged in parallel. Together with the movable support 1 and the chiseling equipment housing 3, they form a parallel four-bar linkage mechanism. The chiseling equipment housing 3 can move downward with the linkage 4 as the radius and move along the arc structure. This allows for oblique chiseling of the ground, improving the impact effect of the chiseling structure 7 on the area to be chiseled and ensuring that the chiseling depth of the concrete base meets the standard.

[0025] like Figures 4-6 and Figures 8-11 As shown, the device also includes an adjusting plate 6. A rotating mounting rod 305, corresponding to each of the chiseling structures 7, is horizontally arranged inside the chiseling equipment housing 3. The chiseling structures 7 are rotatably mounted on the rotating mounting rod 305. The adjusting plate 6 is slidably mounted inside the chiseling equipment housing 3 in a direction perpendicular to the rotating mounting rod 305 and is located above the multiple chiseling structures 7. A rotating compensating rod 8, corresponding to each of the chiseling structures 7, is vertically and elastically slidably arranged on the adjusting plate 6. The lower end of the rotating compensating rod 8 is rotatably mounted on the corresponding chiseling structure 7. The chiseling structure 7 includes a mounting tube 701, which is fitted onto the rotating mounting rod 305. A chisel rod 703 is fixedly mounted on the mounting tube 701. The upper end of the rotating compensating rod 8 has an abutting round head 801, and the lower end has a rotating connector 802. A second rotating connector 702 is provided on the mounting tube 701, and the rotating connector 802 is rotatably mounted on the second rotating connector 702. The upper surface inside the shell 3 of the chiseling equipment is provided with a mounting groove 304 corresponding to the abutting round head 801. A pushing inclined surface 306 is provided in the mounting groove 304, and the abutting round head 801 abuts against the pushing inclined surface 306. A spring 803 is fitted on the rotating compensating rod 8, and a mounting hole 603 is provided on the adjusting plate 6. The rotating compensating rod 8 is inserted into the mounting hole 603 through the spring 803, and the spring 803 abuts against the upper surface of the adjusting plate 6. When the adjusting plate 6 moves, it will drive the chiseling structure 7, including the mounting tube 701, to rotate via the rotating compensating rod 8, thereby adjusting the tilt angle of the chiseling structure 7. At the same time, the abutting round head 801 at the upper end of the rotating compensating rod 8 abuts against the pushing inclined surface 306. As the adjusting plate 6 moves, the abutting round head 801 will have a downward pushing force, preventing the rotating compensating rod 8 and the adjusting plate 6 from jamming and causing adjustment failure. When the adjusting plate 6 is reset, the rotating compensating rod 8 will automatically rise via the spring 803, which will also drive the chiseling structure 7 to reset its angle.

[0026] like Figures 7-9 As shown, the adjusting plate 6 includes a sliding sleeve 601, and a guide slide rod 303 is provided inside the chiseling equipment housing 3. The sliding sleeve 601 is slidably fitted onto the guide slide rod 303. It also includes an adjusting screw 9. A rotating chuck 602 is provided at the end of the adjusting plate 6, and a threaded sleeve 307 is provided on the chiseling equipment housing 3. The adjusting screw 9 is threadedly installed on the threaded sleeve 307, with one end rotatably installed in the rotating chuck 602, and the other end located outside the chiseling equipment housing 3 with a rotating handle. The end of the adjusting screw 9 connected to the rotating chuck 602 is rotatably set in the rotating chuck 602, allowing the adjusting screw 9 to move threadedly within the threaded sleeve 307. This, in turn, pulls the adjusting plate 6 to move via the rotating chuck 602, without affecting the normal rotation of the adjusting screw 9. Example 2

[0027] like Figures 2-5As shown, a chiseling device includes a movable support 1, a chiseling equipment housing 3, and a telescopic device 2. The movable support 1 includes support legs 101, with support legs 101 located at each of the four corners of the lower end face of the movable support 1. Each support leg 101 has a moving wheel 104 at its lower end. Multiple connecting rods 4 are rotatably mounted on both sides of the chiseling equipment housing 3, and each connecting rod 4 is rotatably mounted on the movable support 1. The movable support 1 has mounting rods 102 corresponding to each connecting rod 4, and each mounting rod 102 has a first rotating mounting head 103. The side of the chiseling equipment housing 3 has a second rotating mounting head 301 corresponding to each connecting rod 4, with one end of each connecting rod 4 rotatably mounted on the first rotating mounting head 103 and the other end rotatably mounted on the second rotating mounting head 301. One end of the telescopic device 2 is rotatably mounted on the movable support 1, and the other end is rotatably mounted on the upper surface of the chiseling equipment housing 3. The chiseling equipment housing 3 is driven by the telescopic device 2 and moves in an arc with the connecting rod 4 as the radius. A first rotating connecting seat 302 is provided on the upper surface of the chiseling equipment housing 3, and the telescopic end of the telescopic device 2 is rotatably mounted on the first rotating connecting seat 302. Multiple chiseling structures 7 are installed side by side at the lower end of the chiseling equipment housing 3. Multiple chisel rods 703 are arranged sequentially along their length on each of the multiple chiseling structures 7. The multiple chisel rods 703 are arranged downward and extend out of the chiseling equipment housing 3.

[0028] like Figures 4-6 and Figures 8-11 As shown, the device also includes an adjusting plate 6. A rotating mounting rod 305, corresponding to each of the chiseling structures 7, is horizontally arranged inside the chiseling equipment housing 3. The chiseling structures 7 are rotatably mounted on the rotating mounting rod 305. The adjusting plate 6 is slidably mounted inside the chiseling equipment housing 3 in a direction perpendicular to the rotating mounting rod 305 and is located above the multiple chiseling structures 7. A rotating compensating rod 8, corresponding to each of the chiseling structures 7, is vertically and elastically slidably arranged on the adjusting plate 6. The lower end of the rotating compensating rod 8 is rotatably mounted on the corresponding chiseling structure 7. The chiseling structure 7 includes a mounting tube 701, which is fitted onto the rotating mounting rod 305. A chisel rod 703 is fixedly mounted on the mounting tube 701. The upper end of the rotating compensating rod 8 has an abutting round head 801, and the lower end has a rotating connector 802. A second rotating connector 702 is provided on the mounting tube 701, and the rotating connector 802 is rotatably mounted on the second rotating connector 702. The upper surface inside the shell 3 of the chiseling equipment is provided with a mounting groove 304 corresponding to the abutting round head 801. A pushing inclined surface 306 is provided in the mounting groove 304, and the abutting round head 801 abuts against the pushing inclined surface 306. A spring 803 is fitted on the rotating compensating rod 8, and a mounting hole 603 is provided on the adjusting plate 6. The rotating compensating rod 8 is inserted into the mounting hole 603 through the spring 803, and the spring 803 abuts against the upper surface of the adjusting plate 6.

[0029] like Figures 7-9As shown, the adjusting plate 6 includes a sliding sleeve 601, and a guide slide rod 303 is provided inside the chipping equipment housing 3. The sliding sleeve 601 is slidably fitted onto the guide slide rod 303. It also includes an adjusting screw 9. A rotating chuck 602 is provided at the end of the adjusting plate 6. A threaded sleeve 307 is provided on the chipping equipment housing 3. The adjusting screw 9 is threadedly installed on the threaded sleeve 307, and one end is rotatably installed in the rotating chuck 602. The other end is located outside the chipping equipment housing 3 and is provided with a rotating handle.

[0030] The working principle of this invention is as follows: During use, the movable support 1 with movable wheels 104 enables flexible movement. During operation, the telescopic device 2 provides driving force, which, together with the parallel linkage rods 4 arranged on both sides of equal length, forms a parallel four-bar linkage structure. This drives the chiseling equipment housing 3 to rise and fall along an arc trajectory, causing the chisel rod of the bottom chiseling structure 7 to make an oblique impact on the concrete base surface. Additionally, during use, the external adjusting screw 9 can be rotated to drive the adjusting plate 6 to slide laterally along the guide slide rod 303. The adjusting plate 6 drives multiple sets of rotating compensation rods 8 with springs 803 in linkage, pulling the chiseling structure 7 to rotate around the internal rotating mounting rod 305, precisely adjusting the chiseling tilt angle. Simultaneously, the top of the rotating compensation rod 8 abuts against the pushing inclined surface 306 of the equipment housing, and the elastic extension and contraction of the springs 803 achieves adaptive compensation for angle adjustment, preventing the mechanism from jamming and ensuring that multiple chiseling structures 7 operate synchronously and smoothly. Example 3

[0031] like Figure 1 and Figure 2 As shown, a construction method for preventing leakage at expansion joints in the floor slab of a coal conveyor bridge is described, and the specific steps are as follows: A construction method for preventing leakage at expansion joints in the floor slab of a coal conveyor trestle, characterized by the following specific steps: S100. Base cleaning: Clean the surface of the base layer of the floor slab at the front end of the expansion joint, removing floating dust, coal dust, debris, and loose concrete to ensure that the base layer is clean and free of oil stains.

[0032] S200, Root Roughening and Wetting: The floor slab in the inverted curb area is roughened using a roughening device to a depth of 5mm-10mm. After roughening, the base layer is moistened with water to prevent concrete from drying out and cracking. After roughening, the roughened surface is thoroughly rinsed with clean water to remove concrete debris and dust. Subsequently, the base layer is pre-wetted with water in multiple applications, keeping the base surface continuously moist for at least 24 hours to allow the existing concrete base layer to fully absorb water. Before construction, the base surface is inspected; it should be moist but without standing water to effectively prevent the newly poured concrete from drying shrinkage cracks due to rapid water loss, ensuring the bond strength between the old and new concrete.

[0033] S300, Reverse Sill Positioning and Laying Out: Using the center line of the belt conveyor and the edge line of the expansion joint as benchmarks, measuring instruments are used to mark the inner and outer edges, start and end lines, and top elevation line of the reverse sill. Simultaneously, the center position, pipe opening elevation, and direction of the pre-embedded steel pipe are accurately marked. After laying out, verification and acceptance are performed. Using the already marked center line of the belt conveyor and the two side edges of the floor slab expansion joint as core measurement benchmarks, professional measuring tools such as levels, theodolites, steel tape measures, and chalk lines are used for laying out. The inner and outer contour lines and the start and end lines of both ends of the reverse sill are marked out according to the design dimensions. The designed width of the reverse sill is 300mm. Simultaneously, the top elevation control line of the reverse sill is marked out on the surrounding walls and columns. The height of the reverse sill is controlled between 208mm and 258mm, with the upper limit value uniformly used in low-lying areas. Reverse sill positioning and laying out location installation. Figure 12 The distribution positions of the step area 10, drainage direction 11, center line 12, reverse curb 13, drainage steel pipe 14, and expansion joint 15 are arranged. The reverse curb 13 is a V-shaped structure with the V-shaped opening facing away from the expansion joint 15. The angle of the V-shaped opening is 100°-150°.

[0034] S400, Reinforcement Binding: Bind the reinforcing bars for the inverted retaining wall according to the design requirements, and strictly control the thickness of the concrete cover according to the specifications.

[0035] S500, Pre-embedded steel pipe positioning and reinforcement: Place the drainage steel pipes according to the marked points, adjust the slope, elevation, and angle of the steel pipes, and temporarily reinforce them with steel reinforcement supports to prevent the steel pipes from shifting during concrete pouring; after completion, double-check the position of the steel pipes. The drainage steel pipes used are Φ110×6.0 seamless steel pipes, and the pipe bend length is uniformly 300mm. Place the steel pipes according to the marked points, adjust the overall slope of the pipes, the elevation and orientation of the pipe openings to ensure that the drainage pipes are straight, the drainage slope is reasonable, and the pipe openings are accurately aligned with the direction of the transfer station's sump.

[0036] S600, Formwork Erection and Acceptance: Erect the formwork along the contour of the embankment, ensuring tight joints and firm support, and seal any gaps to prevent grout leakage; check the verticality, cross-sectional dimensions, elevation, and position of the steel pipes of the formwork, and proceed to the next step only after the formwork has passed inspection.

[0037] S700 Concrete Pouring and Vibration: C30 plain concrete with 3% waterproofing powder is poured in layers and vibrated thoroughly with an immersion vibrator to ensure the concrete is dense. Special attention is paid to vibrating the base of the steel pipe and the base of the curb to prevent honeycomb, pitting, and holes. After pouring, the top surface of the curb is finished.

[0038] S800 Formwork Removal: Remove the formwork when the concrete strength reaches more than 50% of the design strength. Avoid collisions or prying of the inverted wall body during the removal process.

[0039] S900 Concrete curing: After demolding, cover the surface of the inverted retaining wall with geotextile and spray water for curing. The curing period shall not be less than 7 days to ensure the waterproof performance and structural strength of the concrete.

[0040] In summary, this invention, by adding a waterproof concrete curb and pre-embedding a drainage steel pipe in the expansion joint area, not only blocks the flushing water from the trestle bridge water flushing system and the moisture contained in the raw coal outside the expansion joint, but also allows for rapid discharge through the drainage steel pipe. This prevents water and coal slag impurities from accumulating and stagnating at the expansion joint for extended periods, thus avoiding the problems of long-term soaking, erosion, and corrosion of the waterproof layer. Furthermore, the parallel four-bar linkage structure drives the chiseling equipment housing to perform an arc-shaped lifting and lowering motion, enabling oblique chiseling of the concrete base surface and effectively enhancing the impact effect of the chisel rod on the floor slab. Simultaneously, the device allows for flexible adjustment of the chiseling structure's tilt angle through the adjustment screw, adjustment plate, and rotating compensation rod.

[0041] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. 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 preventing leakage at expansion joints in the floor slab of a coal conveyor trestle, characterized in that, The specific steps are as follows: S100. Base cleaning: Clean the surface of the base layer of the floor slab at the front end of the expansion joint, removing floating dust, coal dust, debris, and loose concrete to ensure that the base layer is clean and free of oil stains. S200, Root roughening and wetting: The floor slab in the inverted curb area is roughened using a roughening device to a depth of 5mm-10mm. After roughening, water is sprinkled to moisten the base layer to prevent the concrete from losing water and cracking. S300, Reverse Slope Positioning and Laying Out: Using the center line of the belt conveyor and the edge line of the expansion joint as the benchmark, use measuring instruments to pop out the inner and outer edge lines, start and end lines, and top surface elevation lines of the reverse slope. At the same time, accurately mark the center position, pipe opening elevation and direction of the pre-embedded steel pipe. After the laying out is completed, check and accept it. S400, Reinforcement Binding: Bind the reinforcing bars for the inverted curb structure according to the design requirements, and strictly control the thickness of the concrete cover for the reinforcing bars in accordance with the specifications; S500, Pre-embedded steel pipe positioning and reinforcement: Place the drainage steel pipe according to the marked points, adjust the slope, elevation and angle of the steel pipe, and use steel reinforcement supports for temporary reinforcement to prevent the steel pipe from shifting when pouring concrete; after completion, double-check the position of the steel pipe; S600, Formwork Erection and Acceptance: Erect the standard formwork along the contour of the inverted embankment. The formwork should be tightly spliced ​​and firmly supported. Seal the gaps to prevent grout leakage. Check the verticality, cross-sectional dimensions, elevation, and position of the steel pipes of the formwork. Only after the formwork passes the acceptance inspection can the next process be carried out. S700 Concrete Pouring and Vibration: C30 plain concrete with 3% waterproof powder is poured in layers and vibrated thoroughly with an immersion vibrator to ensure the concrete is dense. Special attention is paid to vibrating the base of the steel pipe and the base of the inverted curb to prevent honeycomb, pitting, and voids. After pouring, the top surface of the inverted curb is finished. S800 Formwork Removal: Remove the formwork when the concrete strength reaches more than 50% of the design strength. Avoid collisions or prying of the inverted wall body during the removal process. S900 Concrete curing: After demolding, cover the surface of the inverted retaining wall with geotextile and sprinkle water for curing. The curing period shall not be less than 7 days to ensure the waterproof performance and structural strength of the concrete.

2. The construction method for preventing leakage at expansion joints in the floor slab of a coal conveyor trestle according to claim 1, characterized in that, The chiseling device in step S200 includes a movable support (1), a chiseling equipment housing (3), and a telescopic device (2). Multiple connecting rods (4) are rotatably installed on both sides of the chiseling equipment housing (3), and the multiple connecting rods (4) are rotatably installed on the movable support (1). One end of the telescopic device (2) is rotatably installed on the movable support (1), and the other end is rotatably installed on the upper surface of the chiseling equipment housing (3). The chiseling equipment housing (3) is driven by the telescopic device (2) and performs arc lifting and lowering movements with the connecting rods (4) as the radius. Multiple chiseling structures (7) are installed side by side at the lower end of the chiseling equipment housing (3). Multiple chisel rods (703) are arranged sequentially along the length direction on the multiple chiseling structures (7). The multiple chisel rods (703) are arranged downward and extend out of the chiseling equipment housing (3).

3. A construction method for preventing leakage at expansion joints in the floor slab of a coal conveyor trestle, as described in claim 2, is characterized in that... The movable support (1) includes support legs (101), and support legs (101) are provided at the four corners of the lower end face of the movable support (1). The lower ends of the multiple support legs (101) are provided with movable wheels (104).

4. A construction method for preventing leakage at expansion joints in the floor slab of a coal conveyor trestle, as described in claim 2, is characterized in that... The movable bracket (1) is provided with mounting rods (102) corresponding to each of the connecting rods (4), and the mounting rods (102) are provided with first rotating mounting heads (103); the side of the chiseling equipment housing (3) is provided with second rotating mounting heads (301) corresponding to each of the connecting rods (4), one end of the connecting rod (4) is rotatably mounted on the first rotating mounting head (103); the other end is rotatably mounted on the second rotating mounting head (301).

5. A construction method for preventing leakage at expansion joints in the floor slab of a coal conveyor trestle, as described in claim 2, is characterized in that... The upper end face of the shell (3) of the chiseling equipment is provided with a first rotating connecting seat (302), and the telescopic end of the telescopic device (2) is rotatably installed on the first rotating connecting seat (302).

6. A construction method for preventing leakage at expansion joints in the floor slab of a coal conveyor trestle, as described in claim 2, is characterized in that... In addition, there is an adjustment plate (6). The inside of the chiseling equipment housing (3) is horizontally provided with rotating mounting rods (305) corresponding to each chiseling structure (7). The chiseling structure (7) is rotatably mounted on the rotating mounting rods (305). The adjustment plate (6) is slidably mounted inside the chiseling equipment housing (3) in a direction perpendicular to the rotating mounting rods (305) and is located above the multiple chiseling structures (7). The adjustment plate (6) is vertically elastically slidably provided with rotating compensation rods (8) corresponding to each chiseling structure (7). The lower end of the rotating compensation rods (8) is rotatably mounted on the corresponding chiseling structure (7).

7. A construction method for preventing leakage at expansion joints in the floor slab of a coal conveyor trestle, as described in claim 6, is characterized in that... The chiseling structure (7) includes an installation tube (701), which is fitted onto a rotating installation rod (305). The chisel rod (703) is fixedly mounted on the installation tube (701). The rotating compensation rod (8) has an abutting round head (801) at its upper end and a rotating connector (802) at its lower end. The installation tube (701) has a second rotating connector (702), and the rotating connector (802) is rotatably mounted on the second rotating connector (702).

8. A construction method for preventing leakage at expansion joints in the floor slab of a coal conveyor trestle, as described in claim 7, is characterized in that... The upper inner surface of the shell (3) of the chiseling equipment is provided with a mounting groove (304) corresponding to the abutting round head (801). A pushing inclined surface (306) is provided in the mounting groove (304), and the abutting round head (801) abuts against the pushing inclined surface (306). A spring (803) is fitted on the rotating compensating rod (8), and a mounting hole (603) is provided on the adjusting plate (6). The rotating compensating rod (8) is inserted into the mounting hole (603) through the spring (803), and the spring (803) abuts against the upper surface of the adjusting plate (6).

9. A construction method for preventing leakage at expansion joints in the floor slab of a coal conveyor trestle, as described in claim 6, is characterized in that... The adjusting plate (6) includes a sliding sleeve (601), and a guide slide rod (303) is provided inside the shell (3) of the burring equipment. The sliding sleeve (601) is slidably fitted on the guide slide rod (303).

10. A construction method for preventing leakage at expansion joints in the floor slab of a coal conveyor trestle, as described in claim 9, is characterized in that... In addition, it also includes an adjusting screw (9), the end of the adjusting plate (6) is provided with a rotating chuck (602), the shell of the chiseling equipment (3) is provided with a threaded sleeve (307), the adjusting screw (9) is threadedly installed on the threaded sleeve (307), and one end is rotatably installed in the rotating chuck (602), and the other end is located outside the shell of the chiseling equipment (3) and is provided with a rotating handle.

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