Bridge profile steel expansion joint low-maintenance water-seepage-prevention construction technology

Abstract

The invention discloses a low-maintenance water-seepage-prevention construction process for a bridge section steel expansion joint. The low-maintenance water-seepage-prevention construction process comprises the following specific process steps that (1) construction preparation is conducted; 2) slotting the expansion joint; 3) mounting a profile steel expansion joint; 4) installing a guide and drainage system; (5) concrete is poured; (6) concrete curing; (7) an anti-blocking rubber strip is installed; (8) carrying out quality acceptance; an auxiliary welding device in the step 3 comprises expansion joints, embedded steel bars, a gantry module mechanism, a positioning mechanism, a supporting mechanism, a walking mechanism and transverse steel bars. The embedded steel bars are fixed to the road surface, the expansion joint is placed between the embedded steel bars, and the gantry module mechanism stretches across the expansion joint. Water accumulation at the joint of concrete and asphalt at the expansion joint can be prevented, impermeability of the steel fiber concrete reinforced body is enhanced, the compact structure is guaranteed through four-layer maintenance, the device is kept clean through anti-blocking rubber strips, all links are matched with one another, a full-period protection closed loop is formed, and the profile steel expansion joint can be prevented from inclining and deviating in the pouring process.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge steel expansion joints, and in particular relates to a low-maintenance and anti-water seepage construction process for bridge steel expansion joints. Background Art

[0002] As a critical part of bridge structures, expansion joints have a direct impact on the performance and lifespan of bridges. Over long-term use, traditional bridge expansion joints can experience water leakage, contaminating the abutments, freezing in winter, damaging the durability of the concrete, and cracking and damage to the concrete in the expansion joint anchorage area.

[0003] After searching, the prior art publication number CN119615790A is a bridge steel expansion joint repair construction method based on a new formwork system, which specifically relates to the technical field of bridge steel expansion joint repair construction, including the following steps: S1: pre-construction preparation, S2: on-site construction, S3: construction summary;

[0004] After searching, the prior art publication number CN112921799A found a method for constructing cross-vertical and cross-horizontal expansion joints on urban bridges. The method involves using a T-shaped or cross-shaped cross-vertical and cross-horizontal steel expansion joint at the 2m junction of the longitudinal TST expansion joint and the transverse expansion joint in the side width section. The specific construction method includes opening and cleaning the notch → setting up a waterproof bottom formwork → positioning the steel joint → correcting and anchoring the steel joint → installing the anchoring area formwork → pouring the anchoring concrete → curing the anchoring concrete → installing the waterstop formwork → casting the waterstop in place → installing the finished waterstop.

[0005] The treatment process of the above patent has the following disadvantages: water that seeps from the road asphalt to the bottom of the asphalt flows to the expansion joint and is blocked by the expansion joint and cannot flow away, further causing water accumulation at the intersection of concrete and asphalt at the expansion joint, and even freezing in winter, which damages the durability of the concrete. The concrete in the anchoring area of ​​the expansion joint is cracked and damaged, which affects driving safety. Moreover, during the installation of the expansion joint, it is inconvenient to position the expansion joint when welding it to the embedded steel bars; the expansion joint is prone to tilt and offset during pouring. Summary of the Invention

[0006] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a low-maintenance and anti-seepage construction process for bridge steel expansion joints. The drainage system can prevent water accumulation at the intersection of concrete and asphalt at the expansion joint. The steel fiber concrete reinforced body is anti-seepage, four-layer maintenance ensures the density of the structure, and the anti-blocking rubber strips keep the device clean. All links cooperate with each other to form a full-cycle protection closed loop, which is convenient for positioning and welding of transverse steel bars, steel bars and embedded steel bars; it can prevent the steel expansion joints from tilting and offsetting during the pouring process.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A low-maintenance anti-seepage construction process for bridge steel expansion joints, the specific process steps of which are as follows: 1) Construction preparation: Determine the design parameter requirements of the expansion joint according to the design drawings;

[0009] 2) Expansion joint slotting: a. Use a high-precision total station to measure the planar position of the expansion joint according to the design drawings and mark it. b. Use a concrete cutter to slot along the marked line. c. After slotting, use a jackhammer to break up the concrete in the slot. Then, use a water truck to flush out any debris in the slot.

[0010] 3) Install the steel expansion joint; a. Use a crane to smoothly lift the expansion joint to the slot; b. Then, use a level and total station to measure and adjust the position and elevation of the expansion joint. Center the expansion joint into the slot and use an aluminum alloy straightedge to check the expansion joint to ensure it is aligned with the pavement elevation on both sides; c. Use auxiliary devices to align the expansion joint with the embedded rebar, then weld the embedded rebar to the expansion joint to reinforce it; after welding, remove the auxiliary devices; e. Use an aluminum alloy straightedge to check the flatness again and apply tape to the edges of the groove; lay geotextile on both sides of the expansion joint to protect the pavement;

[0011] 4) Install the drainage system: Install a side drain outlet outside the anchor concrete of the expansion joint at the outermost edge of the roadway. a. First, chisel and clean the side concrete to ensure the drain outlet is in close contact with the side concrete. b. Apply structural adhesive to the edge of the drain outlet and install it in the chiseled and leveled position, with the top surface of the drain outlet flush with the concrete surface of the bridge deck pavement. c. Use one end of a steel bar to support the drain outlet and weld the other end to the embedded steel bar for fixation. Seal the area around the drain outlet with a watertight sealant to prevent water leakage. d. Use a PVC pipe to connect the side drain outlet and extend the pipe through the gap in the expansion joint to the bottom of the bridge. Use water-dispensing adhesive to bond key joints to ensure a tight connection and prevent water leakage.

[0012] 5) Concrete pouring; a. Mix steel fiber reinforced concrete at a concrete mixing station. During the mixing process, evenly disperse the steel fibers in the concrete, with a mixing time of ≤ 3 minutes. b. Transport the concrete to the construction site and pour it. Then, vibrate it with an insert vibrator, evenly arranging the vibration points. Vibrate until there are no more bubbles or slurry on the concrete surface, then stop vibrating. c. After the concrete is poured, smooth it to ensure a smooth surface. d. Before the concrete begins to set, evenly spread the steel fibers on the concrete surface again and use a trowel to press the steel fibers into the concrete surface to a depth of 1 / 3 to 1 / 2 the length of the steel fibers. This will ensure that the steel fibers are tightly bonded to the concrete, forming an effective reinforcement layer and improving the crack resistance and wear resistance of the concrete surface. e. Finally, remove the tape.

[0013] 6) Concrete curing: After the concrete pouring is completed, a "four-layer curing system" is built;

[0014] 7) Install anti-blocking strips. When the concrete strength reaches 80% of the design strength, install the anti-blocking strips. a. First, clean the surface of the expansion joint rubber strips. b. Evenly apply structural adhesive to the rubber strips, then install the anti-blocking strips on the expansion joints and press them firmly. c. After installation, inspect the strips to ensure they meet the installation quality requirements.

[0015] 8) Quality acceptance: Carry out a comprehensive inspection of the construction quality of the expansion joint, and proceed to the next process only after it meets the requirements.

[0016] Preferably, during the cutting and grooving process in step 2, the groove width must be strictly controlled in accordance with the design requirements, with an error range within ±5mm, and the groove depth should meet the installation and anchoring requirements of the expansion device, with a deviation of no more than ±10mm; colored strips of cloth are laid on the edge of the expansion joint to place broken concrete and debris.

[0017] Preferably, during the installation of the expansion joint, the deviation of the coincidence between the center line of the expansion joint and the center line of the bridge is ≤5mm, and the elevation deviation is controlled within the range of ±2mm.

[0018] Preferably, the anti-blocking strip adopts a pressure-resistant rubber hose, which is a three-rubber, two-wire pressure-resistant and wear-resistant hose. The hose diameter is 5mm smaller than the design width of the expansion joint. Black hose is preferred to keep the color consistent with the asphalt pavement.

[0019] Preferably, during the installation of the expansion joint, after welding is completed, polyurethane foam boards are filled in the gap at the top of the expansion joint and the reserved spacing of the box beam, and transparent tape is used to seal the top to prevent concrete from pouring into the reserved gap during concrete pouring.

[0020] Preferably, the concrete curing process: a. First, cover the concrete surface with plastic film, which should be close to the concrete surface, and use sandbags to compact the film around it to prevent moisture evaporation; b. Then, lay water heating pipes on the surface of the plastic film, with the spacing between adjacent water heating pipes ≤ 30cm. The water heating pipes are connected to the water heating pump, and hot water is circulated through the water heating pump to provide a suitable curing temperature for the concrete; c. Cover the water heating pipes with quilts, which should be covered tightly to keep the concrete warm; d. Finally, cover the outermost layer with black plastic sheeting, which can both block wind and absorb solar energy, further increasing the temperature of the curing environment; e. During the curing process, regularly monitor the temperature and humidity of the concrete surface through temperature and humidity monitoring equipment, and record data every 2 hours; based on the monitoring data, timely adjust the water temperature, circulation time and covering thickness of the quilt of the water heating pump to ensure that the concrete is cured under suitable temperature and humidity conditions, thereby improving the strength of the concrete; the curing time is ≥ 14 days.

[0021] The auxiliary device in step 3) includes an expansion joint, embedded steel bars, a gantry module mechanism, a positioning mechanism, a supporting mechanism, a traveling mechanism, and transverse steel bars; the embedded steel bars are fixed to the road surface, the expansion joint is placed between the embedded steel bars, the gantry module mechanism, and the traveling mechanism is provided at both ends of the gantry module mechanism, and the gantry module mechanism spans above the expansion joint; the positioning mechanism and the supporting mechanism are installed on the gantry module mechanism; and the transverse steel bars are welded to the embedded steel bars and the steel bars.

[0022] The gantry module mechanism includes a gantry bracket, a transverse module, and a vertical module I; the gantry bracket spans above the expansion joint, and a pair of transverse modules and vertical modules I are provided. The transverse module is fixedly mounted on the gantry bracket, and the vertical module I is mounted on the transverse module; the positioning mechanism is mounted on the vertical module I.

[0023] The positioning mechanism includes a lifting rod, a shell, a two-way threaded rod I, a movable plate, an outer shell, and a clamping plate; the lifting rod is installed on the gantry module mechanism by bolts, the shell is fixed to the end of the lifting rod away from the gantry module mechanism, and a reinforcing rib is fixed between the lifting rod and the shell, the two-way threaded rod I is rotatably connected to the inside of the shell through a bearing, and a handwheel is provided at one end of the two-way threaded rod I; a pair of movable plates are provided, and the movable plates are located inside the shell; the movable plates are symmetrically connected to the two-way threaded rod I through threads, and a pair of outer shells are provided, and the outer shells are fixed to the corresponding movable plates, the clamping plates are installed on the side walls of the shell, and the clamping plates are provided with several protrusions; a clamping block I is provided at the end of the shell close to the handwheel, and the clamping block I passes through the two-way threaded rod I, and a bolt is provided on the clamping block I, and a wrench is provided at one end of the bolt.

[0024] A supporting mechanism is provided inside the shell; the supporting mechanism includes a rotating shaft, gear I, an internal gear, a connecting rod, a supporting rod, a limiting tooth, and a limiting plate; the rotating shaft is rotatably connected to the shell, and a handle is provided at one end of the rotating shaft; gear I is located inside the shell, gear I is connected to the rotating shaft, the internal gear is engaged inside the shell, and the internal gear is meshed with gear I; a rotating groove is provided on the side wall of the shell, one end of the connecting rod is connected to the outer wall of the internal gear, and the other end passes through the side wall of the shell through the rotating shaft; a pair of mounting seats is provided at the end of the connecting rod away from the internal gear; a pair of supporting rods are provided; the supporting rods are rotatably connected to the corresponding mounting seats through a rotating shaft; the limiting tooth is installed on one side of gear I, a rotating wrench is provided at one end of the limiting tooth, a pair of limiting plates are provided, and the limiting plates are fixed to the outer wall of the shell.

[0025] A rotating mechanism is provided on the side wall of the connecting rod, and the rotating mechanism includes a control rod, a rack, a gear II, a limit column, and a protective cover; a limit hole is provided on the connecting rod, and the protective cover is fixed on the side wall of the connecting rod; a pair of gears II are provided, and gear II is connected to the rotating shaft of the mounting seat; the rack is located between the pair of gears II, and is respectively engaged with the corresponding gear II; the control rod is fixed on the top of the rack, and a limit column is provided on the end of the control rod away from the rack, and the limit column is inserted into the limit hole.

[0026] The fixing mechanism includes a support frame, a vertical module II, and an I-shaped steel; the vertical module II is fixed on the gantry bracket and is located between a pair of horizontal modules I; the support frame is connected to the vertical module II by bolts; and the I-shaped steel is connected to the bottom of the support frame.

[0027] The I-shaped steel is provided with a supporting mechanism, which includes a mounting plate, a two-way threaded rod II, a moving block, a connecting rod, a supporting plate, and a protective plate; the mounting plate is fixed to the I-shaped steel, and a mounting groove is provided on the mounting plate; the two-way threaded rod II is rotatably connected to the mounting groove of the mounting plate through a bearing, and a handwheel is provided at one end of the two-way threaded rod II; a pair of moving blocks are provided, the moving blocks are located inside the mounting groove, and the moving blocks are connected to the two-way threaded rod II through threads; a connecting seat is provided on the moving block, and the connecting rod is rotatably connected to the moving block through the connecting seat; the supporting plate is connected to the end of the connecting rod away from the moving block; the protective plate is fixed on both sides of the mounting groove of the mounting plate, and the moving block passes through the protective plate; a clamping block II is provided at the end of the mounting plate close to the handwheel, the clamping block II passes through the two-way threaded rod II, a bolt is provided on the clamping block II, and a wrench is provided at one end of the bolt.

[0028] The walking mechanism is provided with two groups, which are respectively installed at both ends of the gantry bracket; the walking mechanism includes a walking wheel, a connecting arm, a rotating rod, a turntable, and a protective box; the walking wheel is rotatably connected to the gantry bracket; a locking wheel is provided on the rotating shaft of the walking wheel, and the protective box is installed on the side wall of the gantry bracket outside the locking wheel; an arc-shaped locking tooth is provided at one end of the connecting arm, and the other end passes through the protective box; the locking tooth is meshed and connected with the locking wheel; the turntable is rotatably connected to the side wall of the gantry bracket through a rotating shaft, and the two ends of the rotating rod are respectively rotatably connected to the turntable and the connecting arm through a rotating shaft; a locking rod is provided on the turntable, and the locking rod is threadedly connected to the turntable, and one end is pressed against the side wall of the gantry bracket.

[0029] The drainage system in step 4) includes a drain outlet, which is fixed on the outside of the expansion joint anchor concrete at the outermost edge of the roadway. A drainage grate is provided on the drain outlet, and the other end of the drain outlet is connected to a drain pipe, which extends from under the expansion joint to under the bridge.

[0030] Compared with the prior art, the present invention has the following advantages:

[0031] 1) Side-drain outlets are installed outside the anchorage area to direct accumulated water out of the bridge through PVC pipes. This prevents water accumulation at the intersection of concrete and asphalt at the expansion joints and reduces water erosion of the expansion joints. Steel fibers are incorporated into the expansion joint anchor concrete to improve the concrete's crack resistance and impermeability. Before the concrete initially sets, steel fibers are spread on the surface and vibrated twice to form a crack-resistant surface layer, prevent surface spalling, and enhance the overall performance of the concrete. Throughout the entire process, the drainage system reduces water erosion, the steel fiber concrete enhances the concrete's impermeability, the four-layer curing ensures a dense structure, and anti-blocking strips keep the device clean. Each link works together to form a full-cycle protection closed loop.

[0032] 2) The construction workers use the handle to drive the rotating shaft, gear I, and internal gear to rotate. The internal gear drives the connecting rod to rotate along the rotating groove. The connecting rod drives the supporting rod to rotate, so that the connecting rod and the supporting rod rotate to the bottom of the transverse reinforcement, thereby supporting the transverse reinforcement; when the construction workers turn the handle in the opposite direction, the connecting rod and the supporting rod are driven to rotate in the opposite direction, which can support the transverse reinforcement on the other side, making it convenient to position and weld the transverse reinforcement with the reinforcement and the embedded reinforcement; when the connecting rod and the supporting rod move to the bottom of the transverse reinforcement, first make the limit column away from the limit hole, and then move to Push the control lever downward, the control lever drives the rack to move, the rack drives gear II to rotate, gear II drives the supporting rod to rotate, so that the supporting rod is expanded and then the limit column is pushed into the limit hole, thereby locking the supporting rod to ensure the stability of the supporting rod; the supporting rod supports the transverse steel bars, so that the transverse steel bars are in contact with and welded to the steel bars and embedded steel bars, preventing the expansion joint from deflecting during the subsequent pouring process; when welding is completed, pull the control lever upward to shrink the supporting rod to the same direction as the connecting rod, so that the connecting rod can drive the supporting rod to move out from between the transverse steel bars;

[0033] 3) Construction workers use vertical module II, which drives the support frame and I-shaped steel to move up and down, thereby driving the I-shaped steel to engage on both sides of the expansion joint to prevent the expansion joint from tilting to both sides. At the same time, the support mechanism on the I-shaped steel is inserted between the expansion joints; construction workers use the handwheel to rotate the two-way threaded rod II, which drives the moving block to move through the thread, and the moving block drives the connecting rod to rotate, so that the connecting rod is stretched outward, further driving the support plate to move, so that the support plate supports the expansion joint to prevent the expansion joint from tilting to the middle during welding and pouring. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Attachment Figure 1 This is a structural schematic diagram of a low-maintenance anti-water seepage construction process for a bridge steel expansion joint according to the present invention;

[0035] Attachment Figure 2 This is a structural schematic diagram of an auxiliary device in a low-maintenance anti-seepage construction process for a bridge steel expansion joint according to the present invention;

[0036] Attachment Figure 3 This is a structural schematic diagram of a positioning mechanism in a low-maintenance anti-water seepage construction process for a bridge steel expansion joint according to the present invention;

[0037] Attachment Figure 4 This is a structural schematic diagram of a bidirectional threaded rod I for a low-maintenance anti-seepage construction process for a bridge steel expansion joint according to the present invention;

[0038] Attachment Figure 5 This is a structural schematic diagram of a supporting mechanism in a low-maintenance anti-seepage construction process for a bridge steel expansion joint according to the present invention;

[0039] Attachment Figure 6 It is a structural schematic diagram of a rotating mechanism in a low-maintenance anti-water seepage construction process for a bridge steel expansion joint according to the present invention;

[0040] Attachment Figure 7 This is a structural schematic diagram of a fixing mechanism in a low-maintenance anti-water seepage construction process for a bridge steel expansion joint according to the present invention;

[0041] Attachment Figure 8 This is a structural schematic diagram of a support mechanism in a low-maintenance anti-seepage construction process for a bridge steel expansion joint according to the present invention;

[0042] Attachment Figure 9 It is a side structural diagram of a support mechanism in a low-maintenance anti-seepage construction process for a bridge steel expansion joint according to the present invention;

[0043] Attachment Figure 10 This is a structural schematic diagram of a walking mechanism in a low-maintenance anti-seepage construction process for a bridge steel expansion joint according to the present invention;

[0044] Attachment Figure 11 This is a schematic diagram of the internal structure of a protective cover for a low-maintenance, water-seepage-proof construction process for a bridge steel expansion joint according to the present invention;

[0045] Attachment Figure 12 This is a structural schematic diagram of a drain outlet for a low-maintenance, water-proof construction process for a bridge steel expansion joint according to the present invention;

[0046] Attachment Figure 13 This is a schematic diagram of a drainage grate structure for a low-maintenance anti-seepage construction process for a bridge steel expansion joint according to the present invention;

[0047] In the figure: 1. Expansion joint; 102. Steel bar; 2. Embedded steel bar; 3. Gantry module mechanism; 301. Gantry bracket; 302. Horizontal module; 303. Vertical module I; 4. Positioning mechanism; 401. Lifting rod; 4011. Reinforcement rib; 402. Shell; 4021. Clamping block I; 403. Bidirectional threaded rod I; 404. Moving plate; 405. Shell; 4051. Rotating groove; 406. Clamping plate; 407. Supporting mechanism; 4071. Rotating shaft; 4072. Gear I; 4073. Internal gear; 4074. Connecting rod; 40741. Limiting hole; 40742. Mounting seat; 4075. Supporting rod; 4076. Limiting tooth; 4077. Limiting plate; 408. Rotating mechanism; 4081. Control rod; 4082, rack; 4083, gear II; 4084, limit column; 4085, protective cover; 5. Fixing mechanism; 501, support frame; 5011, vertical module II; 502, I-shaped steel; 503, support mechanism; 5031, mounting plate; 5032, two-way threaded rod II; 5033, moving block; 5034, connecting rod; 5035, support plate; 5036, protective plate; 5037, clamping block II; 6. Traveling mechanism; 601, traveling wheel; 6011, locking wheel; 602, connecting arm; 6021, locking tooth; 603, rotating rod; 604, turntable; 6041, locking rod; 605, protective box; 7. Horizontal reinforcement; 8. Drain outlet; 801, drain grate; 802, drain pipe. DETAILED DESCRIPTION

[0048] To facilitate understanding by those skilled in the art, Figure 1-13 , the technical solution of the present invention is further described in detail.

[0049] A low-maintenance anti-water seepage construction process for bridge steel expansion joints, comprising the following steps:

[0050] 1) Construction preparation: Determine the design parameter requirements of the expansion joint according to the design drawings;

[0051] 2) Expansion joint slotting: a. Use a high-precision total station to measure the planar position of the expansion joint according to the design drawings and mark it. b. Use a concrete cutter to slot along the marked line. c. After slotting, use a jackhammer to break up the concrete in the slot. Then, use a water truck to flush out any debris in the slot.

[0052] 3) Install the steel expansion joint; a. Use a crane to smoothly lift the expansion joint to the slot; b. Then, use a level and total station to measure and adjust the position and elevation of the expansion joint. Center the expansion joint into the slot and use an aluminum alloy straightedge to check the expansion joint to ensure it is aligned with the pavement elevation on both sides; c. Use auxiliary devices to align the expansion joint with the embedded rebar, then weld the embedded rebar to the expansion joint to reinforce it; after welding, remove the auxiliary devices; e. Use an aluminum alloy straightedge to check the flatness again and apply tape to the edges of the groove; lay geotextile on both sides of the expansion joint to protect the pavement;

[0053] 4) Install the drainage system: Install a side drain outlet outside the anchor concrete of the expansion joint at the outermost edge of the roadway. a. First, chisel and clean the side concrete to ensure the drain outlet is in close contact with the side concrete. b. Apply structural adhesive to the edge of the drain outlet and install it in the chiseled and leveled position, with the top surface of the drain outlet flush with the concrete surface of the bridge deck pavement. c. Use one end of a steel bar to support the drain outlet and weld the other end to the embedded steel bar for fixation. Seal the area around the drain outlet with a watertight sealant to prevent water leakage. d. Use a PVC pipe to connect the side drain outlet and extend the pipe through the gap in the expansion joint to the bottom of the bridge. Use water-dispensing adhesive to bond key joints to ensure a tight connection and prevent water leakage.

[0054] 5) Concrete pouring; a. Mix steel fiber reinforced concrete at a concrete mixing station. During the mixing process, evenly disperse the steel fibers in the concrete, with a mixing time of ≤ 3 minutes. b. Transport the concrete to the construction site and pour it. Then, vibrate it with an insert vibrator, evenly arranging the vibration points. Vibrate until there are no more bubbles or slurry on the concrete surface, then stop vibrating. c. After the concrete is poured, smooth it to ensure a smooth surface. d. Before the concrete begins to set, evenly spread the steel fibers on the concrete surface again and use a trowel to press the steel fibers into the concrete surface to a depth of 1 / 3 to 1 / 2 the length of the steel fibers. This will ensure that the steel fibers are tightly bonded to the concrete, forming an effective reinforcement layer and improving the crack resistance and wear resistance of the concrete surface. e. Finally, remove the tape.

[0055] 6) Concrete curing: After the concrete is poured, a "four-layer curing system" is built; Concrete curing process: a. First, cover the concrete surface with plastic film. The film should be close to the concrete surface. Sandbags are used to compact the film around the film to prevent moisture evaporation; b. Then, water heating pipes are laid on the surface of the plastic film. The distance between adjacent water heating pipes is ≤30cm. The water heating pipes are connected to the water heating pump. Hot water circulates through the water heating pump to provide a suitable curing temperature for the concrete; c. Cover the water heating pipes with quilts. The quilts should be covered tightly to provide good warmth; d. Finally, cover the outermost layer with black plastic sheeting. The black plastic sheeting can both block wind and absorb solar energy, further increasing the temperature of the curing environment; e. During the curing process, the temperature and humidity of the concrete surface are regularly monitored by temperature and humidity monitoring equipment, and the data is recorded every 2 hours; Based on the monitoring data, the water temperature, circulation time and covering thickness of the quilt of the water heating pump are adjusted in time to ensure that the concrete is cured under suitable temperature and humidity conditions, thereby improving the concrete strength; Curing time ≥14 days;

[0056] 7) Install anti-blocking strips. When the concrete strength reaches 80% or more of the design strength, install the anti-blocking strips. a. First, clean the surface of the expansion joint rubber strips. b. Evenly apply structural adhesive to the rubber strips, then install the anti-blocking strips on the expansion joints and press them firmly. c. After installation, inspect the strips to ensure they meet installation quality requirements.

[0057] 8) Quality acceptance: Carry out a comprehensive inspection of the construction quality of the expansion joint, and proceed to the next process only after it meets the requirements.

[0058] Furthermore, during the cutting and grooving process in step 2), the groove width must be strictly controlled according to the design requirements, with an error range of ±5mm. The groove depth should meet the installation and anchoring requirements of the expansion device, with a deviation of no more than ±10mm. Colored strips of cloth should be laid on the edge of the expansion joint to place the broken concrete and debris.

[0059] The auxiliary device in step 3) includes an expansion joint 1, embedded steel bars 2, a gantry module mechanism 3, a positioning mechanism 4, a fixing mechanism 5, a walking mechanism 6, and a transverse steel bar 7; the embedded steel bars 2 are fixed on the road surface, and the expansion joint 1 is placed between the embedded steel bars 2. Walking mechanisms 6 are provided at both ends of the gantry module mechanism 3, and the gantry module mechanism 3 spans above the expansion joint 1; the positioning mechanism 4 and the fixing mechanism 5 are installed on the gantry module mechanism 3; the transverse steel bar 7 is welded to the embedded steel bars 2 and the steel bars; first, the expansion joint 1 is placed at the groove of the road surface so that the steel bars on the side wall of the expansion joint 1 correspond to the embedded steel bars 2, and then the positioning mechanism 4 is moved by the gantry module mechanism 3 so that the positioning mechanism 4 corresponds to the steel bars and the embedded steel bars 2, and the steel bars, embedded steel bars 2 and the transverse steel bars 7 are positioned by the positioning mechanism 4, thereby facilitating welding and fixing.

[0060] The positioning mechanism 4 includes a lifting rod 401, a shell 402, a two-way threaded rod I 403, a movable plate 404, a shell 405, and a clamping plate 406; the lifting rod 401 is installed on the gantry module mechanism 3 by bolts; the shell 402 is fixed to the end of the lifting rod 401 away from the gantry module mechanism 3, and a reinforcing rib 4011 is fixed between the lifting rod 401 and the shell 402, which can improve the stability of the shell 402; the two-way threaded rod I 403 is rotatably connected to the inside of the shell 402 through a bearing, and a handwheel is provided at one end of the two-way threaded rod I 403; a pair of movable plates 404 are provided, and the movable plates 404 are located inside the shell 402, and the movable plates 404 are connected to the two-way threaded rod I 403 by threads, a pair of shells 405 are provided, and the shells 405 are fixed to the corresponding movable plates 404, and a pair of clamping plates 406 are provided, Plate 406 is installed on the corresponding side wall of the shell 405, and a number of protrusions are provided on the clamping plate 406; a clamping block I 4021 is provided at one end of the shell 402 close to the handwheel, and the clamping block I 4021 passes through the bidirectional threaded rod I 403, and a bolt is provided on the clamping block I 4021, and a wrench is provided at one end of the bolt; the friction force of the clamping plate 406 can be increased; the construction personnel rotate the bidirectional threaded rod I 403 through the handwheel, and the bidirectional threaded rod I 403 drives the movable plate 404 to move along the shell 402 through the thread, and the movable plate 404 drives the shell 405 to move, and the shell 405 drives the clamping plate 406 to move toward the middle, and the clamping plate 406 clamps and positions the steel bars 102 and the embedded steel bars 2, thereby facilitating the welding and fixing of the steel bars 102 and the embedded steel bars 2, and preventing the expansion joint 1 from offsetting during the subsequent pouring process, which affects the installation of the expansion joint 1.

[0061] The housing 405 is provided with a supporting mechanism 407; the supporting mechanism 407 includes a rotating shaft 4071, a gear I 4072, an internal gear 4073, a connecting rod 4074, a supporting rod 4075, a limiting tooth 4076, and a limiting plate 4077; the rotating shaft 4071 is rotatably connected to the housing 405, and a handle is provided at one end of the rotating shaft 4071; the gear I 4072 is located inside the housing 405, and the gear I 4072 is connected to the rotating shaft 4071 , the internal gear 4073 is engaged with the inside of the housing 405, and the internal gear 4073 is meshed with the gear I 4072; a rotation groove 4051 is provided on the side wall of the housing 405, one end of the connecting rod 4074 is connected to the outer wall of the internal gear 4073, and the other end passes through the side wall of the housing 405 through the rotating shaft 4071; a pair of mounting seats 40742 are provided on the end of the connecting rod 4074 away from the internal gear 4073; the supporting rod 4075 is rotatably connected to the housing 405 through the rotating shaft. On the corresponding mounting seat 40742, a limiting tooth 4076 is installed on one side of the gear I 4072, and a rotating wrench is provided at one end of the limiting tooth 4076. A pair of limiting plates 4077 are provided, and the limiting plates 4077 are fixed to the outer wall of the outer shell 405; the construction personnel drive the rotating shaft 4071 to rotate through the handle, the rotating shaft 4071 drives the gear I 4072 to rotate, the gear I 4072 drives the internal gear 4073 to rotate, the internal gear 4073 drives the connecting rod 4074 to rotate along the rotating groove 4051, and the connecting rod 4074 drives the supporting rod 4075 to rotate, so that the connecting rod 4074 and the supporting rod 4075 rotate to the bottom of the transverse steel bar 7, thereby supporting the transverse steel bar 7; when the construction personnel rotate the handle in the opposite direction, the connecting rod 4074 and the supporting rod 4075 are driven to rotate in the opposite direction, which can support the transverse steel bar 7 on the other side; it is convenient to position and weld the transverse steel bar 7 with the steel bar 102 and the embedded steel bar 2.

[0062] The side wall of the connecting rod 4074 is provided with a rotating mechanism 408, which includes a control rod 4081, a rack 4082, a gear II 4083, a limiting column 4084, and a protective cover 4085; a limiting hole 40741 is provided on the connecting rod 4074, and the protective cover 4085 is fixed to the side wall of the connecting rod 4074; a pair of gears II 4083 are provided, and the gears II 4083 are connected to the rotating shaft of the mounting seat 40742; the rack 4082 is located between the pair of gears II 4083 and is respectively engaged with the corresponding gears II 4083; the control rod 4081 is fixed to the top of the rack 4082, and a limiting column 4084 is provided at the end of the control rod 4081 away from the rack 4082, and the limiting column 4084 is inserted into the limiting hole 40741; when the connecting rod 4074 and the supporting rod 4075 move to the bottom of the transverse reinforcement 7, first make The limiting column 4084 moves away from the limiting hole 40741, and then pushes the control rod 4081 downward, the control rod 4081 drives the rack 4082 to move, the rack 4082 drives the gear II 4083 to rotate, and the gear II 4083 drives the supporting rod 4075 to rotate, so that the supporting rod 4075 is stretched and then the limiting column 4084 is pushed into the limiting hole 40741, thereby locking the supporting rod 4075 to ensure the stability of the supporting rod 4075; the supporting rod 4075 supports the transverse steel bar 7, so that the transverse steel bar 7 contacts and welds with the steel bar 102 and the embedded steel bar 2 to prevent the expansion joint 1 from offsetting during the subsequent pouring process; when the welding is completed, the control rod 4081 is pulled upward to make the supporting rod 4075 shrink to the same direction as the connecting rod 4074, so that the connecting rod 4074 can drive the supporting rod 4075 to move out from between the transverse steel bars 7.

[0063] The gantry module mechanism 3 includes a gantry bracket 301, a transverse module 302, and a vertical module I 303; the gantry bracket 301 spans above the expansion joint 1, and a pair of transverse modules 302 and vertical modules I 303 are provided, the transverse module 302 is fixedly mounted on the gantry bracket 301, and the vertical module I 303 is mounted on the transverse module 302; the positioning mechanism 4 is mounted on the vertical module I 303; the transverse module 302 and the vertical module I 303 can drive the positioning mechanism 4 to move on the gantry bracket 301, thereby adjusting the position of the positioning mechanism 4; further facilitating the positioning mechanism 4 to position the steel bars 102 and the embedded steel bars 2, and facilitating welding and fixation.

[0064] The fixing mechanism 5 includes a support frame 501, a vertical module II 5011, and an I-shaped steel 502; the vertical module II 5011 is fixed on the gantry bracket 301 and is located between a pair of horizontal modules 302; the support frame 501 is connected to the vertical module II 5011 by bolts; the I-shaped steel 502 is connected to the bottom of the support frame 501; the construction personnel drive the support frame and the I-shaped steel up and down through the vertical module II, thereby driving the I-shaped steel 502 to engage on both sides of the expansion joint 1 to prevent the expansion joint 1 from tilting to both sides.

[0065] The I-shaped steel 502 is provided with a support mechanism 503, which includes a mounting plate 5031, a two-way threaded rod II 5032, a moving block 5033, a connecting rod 5034, a support plate 5035, and a protective plate 5036; the mounting plate 5031 is fixed to the I-shaped steel 502, and a mounting groove is provided on the mounting plate 5031; the two-way threaded rod II 5032 is rotatably connected to the mounting groove of the mounting plate 5031 through a bearing, and a handwheel is provided at one end of the two-way threaded rod II 5032; a pair of moving blocks 5033 are provided, the moving blocks 5033 are located inside the mounting groove, and the moving blocks 5033 are connected to the two-way threaded rod II 5032 through threads; a connecting seat is provided on the moving block 5033, and the connecting rod 5034 is rotatably connected to the moving block 5033 through the connecting seat; the support plate 5035 is connected to The connecting rod 5034 is away from one end of the moving block 5033; the protective plate 5036 is fixed on both sides of the mounting groove of the mounting plate 5031, and the moving block passes through the protective plate 5036; the mounting plate 5031 is provided with a clamping block II 5037 at the end close to the handwheel, and the clamping block II 5037 passes through the bidirectional threaded rod II 5032, and a bolt is provided on the clamping block II 5037, and a wrench is provided at one end of the bolt; the construction personnel rotate the bidirectional threaded rod II 5032 through the handwheel, and the bidirectional threaded rod II 5032 drives the moving block 5033 to move through the thread, and the moving block 5033 drives the connecting rod 5034 to rotate, so that the connecting rod 5034 is stretched outward, and further drives the support plate 5035 to move, so that the support plate 5035 supports the expansion joint 1 to prevent the expansion joint 1 from tilting toward the middle during welding and pouring.

[0066] The walking mechanism 6 is provided with two groups, respectively installed at both ends of the gantry bracket 301; the walking mechanism 6 includes a walking wheel 601, a connecting arm 602, a rotating rod 603, a turntable 604, and a protective box 605; the walking wheel 601 is rotatably connected to the gantry bracket 301; a locking wheel 6011 is provided on the rotating shaft of the walking wheel 601, and the protective box 605 is installed on the side wall of the gantry bracket 301 outside the locking wheel 6011; one end of the connecting arm 602 is provided with an arc-shaped locking tooth 6021, and the other end passes through the protective box 605; the locking tooth 6021 is meshed with the locking wheel 6011; the turntable 604 is rotatably connected to the side of the gantry bracket 301 through the rotating shaft The locking rod 6041 is connected to the turntable 604 through a threaded connection, and one end of the locking rod 6041 is pressed against the side wall of the gantry bracket 301 to prevent the connecting arm 602 from falling. The locking rod 6041 is rotated to move the locking rod 6041 away from the gantry bracket 301, and the turntable 604 is rotated by the locking rod 6041. The turntable 604 drives the connecting arm 602 to move up and down through the rotating rod 603, so that the locking teeth 6021 on the connecting arm 602 are engaged with the locking wheel 6011, thereby locking the walking wheel 601.

[0067] The drainage system in step 4) includes a drain outlet 8, which is fixed to the outside of the expansion joint anchor concrete at the outermost edge of the roadway. A drainage grate 801 is provided on the drain outlet 8, and the other end of the drain outlet 8 is connected to a drainage pipe 802, which extends from under the expansion joint to under the bridge.

[0068] In the description of the present invention, unless otherwise specified, "several" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended only to facilitate and simplify the description of the present invention. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed or operate in a specific direction, and therefore should not be construed as limiting the present invention.

[0069] The above content is merely an example and explanation of the structure of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. A low-maintenance anti-seepage construction process for bridge steel expansion joints, characterized in that The specific process steps are as follows: 1) Construction preparation: Determine the design parameter requirements of the expansion joint according to the design drawings; 2) Expansion joint slotting: a. Use a total station to measure the plane position of the expansion joint according to the design drawings and mark it; b. Use a concrete cutter to cut grooves along the marked lines. c. After cutting the grooves, use a jackhammer to break up the concrete in the grooves. Then use a water truck to flush out any debris in the grooves. 3) Installing the steel expansion joint: a. Use a crane to smoothly lift the expansion joint to the notch. b. Use a level and total station to measure and adjust the position and elevation of the expansion joint. Center the expansion joint into the notch and use an aluminum alloy straightedge to check the expansion joint to ensure it aligns with the pavement elevation on both sides. c. Use an auxiliary device to align the expansion joint with the embedded steel bars. Then weld the embedded steel bars to the expansion joint to reinforce them. After welding, remove the auxiliary device. e. Use an aluminum alloy straightedge to check the flatness again and apply tape to the edges of the groove. Lay geotextile on both sides of the expansion joint to protect the pavement. 4) Install the drainage system: Install a side drain outlet outside the anchor concrete of the expansion joint at the outermost edge of the roadway. a. First, chisel the side concrete flat and clean it. b. Apply structural adhesive to the edge of the drain outlet and install it in the chiseled-flat position, with the top surface of the drain outlet flush with the concrete surface of the bridge deck pavement. c. Use one end of a steel bar to support the drain outlet and weld the other end to the embedded steel bar for fixation. Seal the area around the drain outlet with watertight sealant to prevent water leakage. d. Connect the side drain outlet with PVC pipe, extending the pipe through the gap in the expansion joint to the bottom of the bridge. Use water-dispensing adhesive to bond the joints to ensure a tight connection and no water leakage. 5) Concrete pouring: a. Mix steel fiber reinforced concrete at a concrete mixing station. During the mixing process, evenly disperse the steel fibers in the concrete for a mixing time of ≥ 3 minutes. b. Transport the concrete to the construction site and pour it. Then, vibrate it with an insert vibrator, evenly arranging the vibration points. Vibrate until there are no more bubbles or slurry on the concrete surface. Then stop vibrating. c. After the concrete is poured, smooth it to ensure a smooth surface. d. Before the concrete begins to set, evenly spread the steel fibers on the concrete surface again and use a trowel to press the steel fibers into the concrete surface to a depth of 1 / 3 to 1 / 2 the length of the steel fibers. This will ensure that the steel fibers are tightly bonded to the concrete, forming an effective reinforcement layer and improving the crack resistance and wear resistance of the concrete surface. e. Finally, remove the tape. 6) Concrete curing: After the concrete is poured, a "four-layer curing system" is built; 7) Install anti-blocking strips: When the concrete strength reaches 80% of the design strength, install the anti-blocking strips. a. Clean the surface of the expansion joint rubber strips. b. Apply structural adhesive evenly to the rubber strips, then install the anti-blocking strips on the rubber strips and press them firmly to ensure they are securely installed. c. After installation, inspect the strips to ensure they meet installation quality requirements. 8) Quality acceptance: Carry out a comprehensive inspection of the construction quality of the expansion joint, and proceed to the next process only after it meets the requirements.

2. A low-maintenance anti-water seepage construction process for bridge steel expansion joints according to claim 1, characterized in that During the cutting and grooving process in step 2, the groove width must be strictly controlled according to the design requirements, with an error range of ±5mm, and the groove depth should meet the installation and anchoring requirements of the expansion device, with a deviation range of ±10mm; colored strips of cloth are laid on the edge of the expansion joint to place broken concrete and debris.

3. A low-maintenance anti-water seepage construction process for bridge steel expansion joints according to claim 1, characterized in that During the installation of the expansion joint, the deviation of the overlap between the center line of the expansion joint and the center line of the bridge is ≤5mm, and the elevation deviation is controlled within the range of ±2mm.

4. The low-maintenance anti-water seepage construction process for bridge steel expansion joints according to claim 1 is characterized in that The anti-blocking strip adopts a pressure-resistant rubber hose. The pressure-resistant rubber hose is a three-rubber, two-wire pressure-resistant and wear-resistant hose. The diameter of the hose is 5mm smaller than the design width of the expansion joint. Black hose is preferred to keep the color consistent with the asphalt pavement.

5. The low-maintenance anti-water seepage construction process for bridge steel expansion joints according to claim 1 is characterized in that Concrete curing process: a. First, cover the concrete surface with plastic film. The film should be close to the concrete surface. Use sandbags to compact the film around to prevent moisture evaporation; b. Then lay water heating pipes on the surface of the plastic film. The distance between adjacent water heating pipes is ≤30cm. The water heating pipes are connected to the water heating pump. Hot water circulates through the water heating pump to provide a suitable curing temperature for the concrete; c. Cover the water heating pipes with a quilt. The quilt must be covered tightly; d. Finally, cover the outermost layer with black plastic sheeting; e. During the curing process, regularly monitor the temperature and humidity of the concrete surface through temperature and humidity monitoring equipment, and record data every 2 hours; according to the monitoring data, timely adjust the water temperature, circulation time and covering thickness of the quilt of the water heating pump to ensure that the concrete is cured under suitable temperature and humidity conditions, thereby improving the strength of the concrete; the curing time is ≥ 14 days.

6. The low-maintenance anti-water seepage construction process for bridge steel expansion joints according to claim 1 is characterized in that The auxiliary device in step 3) includes an expansion joint, embedded steel bars, a gantry module mechanism, a positioning mechanism, a support mechanism, a traveling mechanism, and transverse steel bars; the embedded steel bars are fixed to the road surface, the expansion joint is placed between the embedded steel bars, and the gantry module mechanism has traveling mechanisms at both ends, and the gantry module mechanism spans over the expansion joint; The gantry module mechanism includes a gantry support, a transverse module, and a vertical module I. The gantry support spans above the expansion joint. A pair of transverse modules and vertical module I are provided. The transverse module is fixedly mounted on the gantry support, while the vertical module I is mounted on the transverse module. The positioning mechanism is mounted on the vertical module I. The positioning mechanism includes a lifting rod, a shell, a two-way threaded rod I, a movable plate, an outer shell, and a clamping plate; the lifting rod is mounted on the gantry module mechanism by bolts, the shell is fixed to the end of the lifting rod away from the gantry module mechanism, and a reinforcing rib is fixed between the lifting rod and the shell; the two-way threaded rod I is rotatably connected to the inside of the shell through a bearing, and a handwheel is provided at one end of the two-way threaded rod I; a pair of movable plates are provided, and the movable plates are located inside the shell; the movable plates are symmetrically connected to the two-way threaded rod I by threads, and a pair of outer shells are provided, and the outer shells are fixed to the corresponding movable plates, and the clamping plates are mounted on the side walls of the shell, and the clamping plates are provided with a number of protrusions; a clamping block I is provided at the end of the shell close to the handwheel, and the clamping block I passes through the two-way threaded rod I, and a bolt is provided on the clamping block I, and a wrench is provided at one end of the bolt; The fixing mechanism includes a support frame, vertical module II, and I-shaped steel; the vertical module II is fixed on the gantry support and is located between a pair of horizontal modules I; the support frame is connected to the vertical module II by bolts; the I-shaped steel is connected to the bottom of the support frame; The drainage system in step 4) includes a drain outlet, which is fixed to the outside of the expansion joint anchor concrete at the outermost edge of the roadway. The drain outlet is provided with a drainage grate, and the other end of the drain outlet is connected to a drainage pipe, which extends from under the expansion joint to under the bridge.

7. A low-maintenance anti-water seepage construction process for bridge steel expansion joints according to claim 6, characterized in that A supporting mechanism is provided inside the shell; the supporting mechanism includes a rotating shaft, gear I, an internal gear, a connecting rod, a supporting rod, a limiting tooth, and a limiting plate; the rotating shaft is rotatably connected to the shell, and a handle is provided at one end of the rotating shaft; gear I is located inside the shell, gear I is connected to the rotating shaft, the internal gear is engaged inside the shell, and the internal gear is meshed with gear I; a rotating groove is provided on the side wall of the shell, one end of the connecting rod is connected to the outer wall of the internal gear, and the other end passes through the side wall of the shell through the rotating shaft; a pair of mounting seats is provided at the end of the connecting rod away from the internal gear; a pair of supporting rods are provided; the supporting rods are rotatably connected to the corresponding mounting seats through a rotating shaft; the limiting tooth is installed on one side of gear I, a rotating wrench is provided at one end of the limiting tooth, a pair of limiting plates are provided, and the limiting plates are fixed to the outer wall of the shell.

8. The low-maintenance anti-water seepage construction process for bridge steel expansion joints according to claim 6 is characterized in that A rotating mechanism is provided on the side wall of the connecting rod, and the rotating mechanism includes a control rod, a rack, a gear II, a limit column, and a protective cover; a limit hole is provided on the connecting rod, and the protective cover is fixed on the side wall of the connecting rod; a pair of gear II is provided, and gear II is connected to the rotating shaft of the mounting seat; the rack is located between the pair of gears II, and is respectively engaged with the corresponding gear II; the control rod is fixed on the top of the rack, and a limit column is provided at the end of the control rod away from the rack, and the limit column is inserted into the limit hole.

9. The low-maintenance anti-water seepage construction process for bridge steel expansion joints according to claim 6 is characterized in that A supporting mechanism is provided on the I-shaped steel, which includes a mounting plate, a two-way threaded rod II, a moving block, a connecting rod, a supporting plate, and a protective plate; the mounting plate is fixed on the I-shaped steel, and a mounting groove is provided on the mounting plate; the two-way threaded rod II is rotatably connected to the mounting groove of the mounting plate through a bearing, and a handwheel is provided at one end of the two-way threaded rod II; a pair of moving blocks are provided, the moving blocks are located inside the mounting groove, and the moving blocks are connected to the two-way threaded rod II through threads; a connecting seat is provided on the moving block, and the connecting rod is rotatably connected to the moving block through the connecting seat; the supporting plate is connected to the end of the connecting rod away from the moving block; the protective plate is fixed on both sides of the mounting groove of the mounting plate, and the moving block passes through the protective plate; a clamping block II is provided at the end of the mounting plate close to the handwheel, the clamping block II passes through the two-way threaded rod II, a bolt is provided on the clamping block II, and a wrench is provided at one end of the bolt.

10. A low-maintenance anti-water seepage construction process for bridge steel expansion joints according to claim 6, characterized in that There are two groups of walking mechanisms, which are respectively installed at both ends of the gantry bracket; the walking mechanism includes walking wheels, connecting arms, rotating rods, turntables, and protective boxes; the walking wheels are rotatably connected to the gantry bracket; a locking wheel is provided on the rotating shaft of the walking wheel, and the protective box is installed on the side wall of the gantry bracket outside the locking wheel; an arc-shaped locking tooth is provided at one end of the connecting arm, and the other end passes through the protective box; the locking tooth is meshed and connected with the locking wheel; the turntable is rotatably connected to the side wall of the gantry bracket through a rotating shaft, and the two ends of the rotating rod are respectively rotatably connected to the turntable and the connecting arm through a rotating shaft; a locking rod is provided on the turntable, which is threaded to the turntable, and one end is pressed against the side wall of the gantry bracket.

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