Cast-in-situ bridge guardrail false seam cutting device

Abstract

The present application discloses a kind of cast-in-place bridge guardrail false seam cutting device, including profiling guide rail, fixed frame and walking mechanism, profiling guide rail profiling the appearance of guardrail, wherein a group of profiling guide rail inside is provided with rack along profiling guide rail;Fixed frame includes the clamp of fixed sleeve on grooving machine, also includes two groups of fixed plate arranged in the both sides of grooving machine;The end of both sides of fixed plate is fixedly connected with support arm;Walking mechanism includes two groups of vertical plate, and the lower portion of vertical plate is equipped with walking wheel;One side of one group of vertical plate is connected with motor base, and drive motor and speed reducer are installed on one side of motor base, and gear is fixedly connected on the output shaft of speed reducer.The present application utilizes profiling guide rail profiling the appearance of guardrail, and the walking wheel of walking mechanism is embedded in the inside limit of guide rail, so that grooving machine moves at uniform speed along the preset trajectory of profiling guide rail, reduces the labor intensity of operating personnel, guarantees the quality and consistency of false seam cutting, and improves the efficiency of false seam cutting.

Description

Technical Field

[0001] This invention belongs to the field of bridge railing dummy joint cutting technology, and specifically relates to a dummy joint cutting device for cast-in-place bridge railings. Background Technology

[0002] Cast-in-place concrete crash barriers are core safety components in bridge engineering, formed through continuous casting to ensure structural integrity and protective reliability. However, the continuous casting length of crash barriers can typically reach tens or even hundreds of meters. During the concrete setting and hardening process and later use stages, the barrier is subject to the combined effects of internal and external factors such as the release of heat from cement hydration, diurnal temperature variations, and the drying shrinkage of concrete moisture. This results in cumulative shrinkage stress within the barrier. If this shrinkage stress cannot be effectively released, it will lead to irregularly distributed stress- or non-stress-related cracks on the barrier surface. These cracks not only damage the barrier's appearance but may also gradually extend into the structure, reducing its impermeability, durability, and load-bearing capacity, seriously affecting the operational safety of the bridge.

[0003] To address the aforementioned issues, the engineering field commonly employs a technique of installing dummy joints in cast-in-place concrete crash barriers. By pre-setting a weak section, shrinkage stress is guided and released in a concentrated manner, creating a controllable crack at the dummy joint location, thus preventing irregular and harmful random cracks. According to industry construction specifications and engineering practice requirements, this dummy joint must meet strict dimensional accuracy: the cut width is controlled at 3mm, and the cut depth is precisely set at 30mm. This ensures that the concrete shrinkage stress is concentrated and dispersed at the dummy joint, effectively reducing the generation of drying shrinkage cracks, while also preventing excessively deep cuts from damaging the internal reinforcing steel bars of the barrier, thus guaranteeing the structural safety of the barrier.

[0004] Currently, the cutting of dummy joints in bridge engineering still mainly relies on manual operation, with construction workers using hand-held cutting tools to cut along pre-marked lines. However, this manual cutting method has many insurmountable drawbacks:

[0005] First, the lack of an effective positioning and guiding mechanism during the cutting process means that the stability of the construction workers' operation is greatly affected by factors such as experience and physical strength, resulting in poor straightness of the dummy seam, frequent problems such as tilting and offset of the cut, and failure to meet the requirements of the project quality for the linear accuracy of the dummy seam.

[0006] Secondly, depth control relies entirely on manual judgment, making it difficult to accurately control the cutting depth. This can easily result in cuttings that are too shallow or too deep. When the cutting is too shallow, it cannot effectively disperse shrinkage stress, while when the cutting is too deep, there is a risk of damaging the internal reinforcing steel bars, which seriously affects the effectiveness of the dummy joint and the safety of the guardrail structure.

[0007] In addition, manual cutting is inefficient and labor-intensive, especially in high-altitude bridge operations, where operational safety is poor and consistent cutting quality is difficult to guarantee, making it unsuitable for the construction schedule and quality requirements of large-scale bridge projects. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide a device for cutting dummy joints in cast-in-place bridge railings, so as to solve the problem that the existing manual cutting method for dummy joints cannot meet the quality, efficiency and safety requirements of cutting dummy joints in cast-in-place bridge railings.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0010] A device for cutting dummy joints in cast-in-place bridge railings, comprising:

[0011] The contour guide rail conforms to the shape of the guardrail. The contour guide rail is configured in two sets, and the two ends of the two sets of contour guide rails are connected by a connecting plate. One set of contour guide rails has a rack inside that runs along the contour guide rail.

[0012] A fixing frame for fixing a grooving machine includes a clamp that is fixedly sleeved on the grooving machine. The clamp has fixing shafts on both sides. It also includes two sets of fixing plates on both sides of the grooving machine. The ends of the fixing shafts pass through the fixing plates and are locked to the fixing plates with nuts. The lower part of the fixing plates is provided with fastening bolts that connect to the side of the grooving machine. Support arms are fixedly connected to the ends of the fixing plates on both sides.

[0013] The traveling mechanism is used to drive the grooving machine to travel along the contour guide rail. It includes two sets of upright plates, with traveling wheels at the bottom of the upright plates. The traveling wheels are located inside the contour guide rail, and the support arm is connected to the upright plates. One side of one set of upright plates is connected to a motor base, and a drive motor and a reducer are installed on one side of the motor base. A gear is fixedly connected to the output shaft of the reducer, and the gear meshes with the rack.

[0014] Furthermore, a rubber pad is provided on the contact surface between the contour guide rail and the guardrail.

[0015] Furthermore, the contour guide rail is provided with a counterweight platform at one end located on the front side of the guardrail, and a counterweight block is provided on the counterweight platform.

[0016] Furthermore, the contour guide rail includes a first guide rail disposed on the upper and front sides of the guardrail and a second guide rail disposed on the back of the guardrail, the first guide rail and the second guide rail being movably connected by a hinge.

[0017] Furthermore, a connecting shaft is rotatably connected to one side of the first guide rail, and a pressure arm is fixedly connected to the connecting shaft. The pressure arm has an L-shaped structure, and a pressure rod is provided at one end of the pressure arm. A fixing seat is fixedly installed on one side of the second guide rail, and a pressure groove is provided on the fixing seat to accommodate the pressure rod. After the pressure arm is lowered, the pressure rod is inserted into the pressure groove. A slide rail is provided on one side of the first guide rail, and a locking seat is slidably installed on the slide rail. A locking bolt is threaded onto the locking seat, and after the locking bolt is tightened, it abuts against the slide rail.

[0018] Furthermore, the contact surface between the locking seat and the pressure arm is an inclined surface.

[0019] Furthermore, one end of the pressure arm is provided with a caster, the caster including a wheel frame and a roller rotatably disposed on one side of the wheel frame, the wheel frame being fixedly connected to the connecting shaft, when the pressure arm is lowered, the caster is separated from the top surface of the guardrail, and when the pressure arm is raised, the caster is supported on the top surface of the guardrail.

[0020] Furthermore, the cutting blade of the grooving machine is provided with a dust cover, and the dust cover is provided with several nozzles. The nozzles are connected to water pipes for dust reduction during the slit cutting process and for cooling the cutting blade. The fixing plate is provided with several pipe clamps for fixing the water pipes.

[0021] Furthermore, the upright plate is provided with an adjustment groove, one end of the support arm passes through the adjustment groove and is fixedly connected to a threaded sleeve, and an adjustment screw is rotatably connected to the upper end of the upright plate. The adjustment screw is threadedly connected to the threaded sleeve and is used to adjust the height of the fixing frame.

[0022] Furthermore, the support arm has a two-section structure, with connecting flanges at the ends of both sections. An angle adjustment mechanism is provided between the two sections for adjusting the tilt angle of the fixing frame. The angle adjustment mechanism includes a housing, one side of which is connected to one of the connecting flanges. A rotating shaft is rotatably connected inside the housing, and a worm gear is fixedly connected to the rotating shaft. A flange is provided at one end of the rotating shaft, and the flange is connected to the other connecting flange. A worm is engaged on one side of the worm gear, and a handwheel is provided at one end of the worm.

[0023] The beneficial effects of this invention are:

[0024] (1) The present invention utilizes the shape of the contour guide rail and the contour guardrail, and the walking wheel of the walking mechanism is embedded in the guide rail for limiting, so that the grooving machine moves at a constant speed along the preset trajectory of the contour guide rail, which reduces the labor intensity of the operators, ensures the quality and consistency of the dummy seam cutting, and improves the efficiency of the dummy seam cutting.

[0025] (2) A counterweight platform is set at the bottom of the contour guide rail located in front of the guardrail. When cutting the dummy seam, a counterweight block is placed on the counterweight platform, or the operator steps on the counterweight platform to ensure the stability of the device when cutting the dummy seam.

[0026] (3) The first guide rail and the second guide rail are connected by hinges. They can be opened or disassembled flexibly according to the local shape of the guardrail. They do not need to be installed as a whole from the end of the guardrail. They can be assembled directly at the target cutting position, which improves the installation efficiency of the cutting device, avoids the guide rail from scratching the surface of the guardrail, and effectively protects the aesthetics and integrity of the concrete surface of the guardrail.

[0027] (4) After the pressure arm is lowered, the pressure rod is precisely inserted into the pressure groove of the fixed seat to form a preliminary positioning constraint. Then, the locking seat is slid to the upper part of the pressure arm through the slide rail. The locking bolt is tightened to fix the locking seat against the slide rail. The vertical pressing force of the locking seat on the pressure arm is used to tightly fit the second guide rail against the surface of the guardrail, eliminating the jumping of the second guide rail during the cutting operation, avoiding the fluctuation of the cutting depth, and ensuring the accuracy of the false cutting.

[0028] (5) Casters are installed at the end of the pressure arm, which not only reduces the frictional resistance between the device and the guardrail when the device is moved, but also allows the device to be moved to the next cutting position when the locking seat is loosened first, and then the pressure arm is lifted. During the lifting of the pressure arm, the casters first contact the top surface of the guardrail to form a support fulcrum. When the force is applied, the torque of the pressure arm is converted into a lateral pushing force on the first guide rail, pushing the first guide rail to the front side of the guardrail and separating it from the guardrail surface. Then the second guide rail is lifted. At this time, the contour guide rail does not contact the guardrail when the device is moved, avoiding the risk of friction and collision between the contour guide rail and the guardrail surface during the device transfer process.

[0029] (6) A dust cover is installed on the outside of the cutting blade of the grooving machine, and a nozzle is installed on the dust cover. The nozzle is connected to a water pipe to facilitate dust reduction and cooling of the cutting blade during the slit cutting process.

[0030] (7) An adjustment groove is provided on the upright plate and a threaded sleeve is provided at one end of the support arm. An adjustment screw is rotatably connected to the upper end of the upright plate to facilitate the adjustment of the height of the fixing frame and thus the adjustment of the cutting depth of the dummy seam.

[0031] (8) With the help of the two-section support arm and angle adjustment mechanism, the tilt angle of the fixed frame can be flexibly adjusted by turning the handwheel, so that the grooving machine deflects around the connection of the support arm, avoiding interference from the ground or surrounding obstacles, ensuring that the cutting blade can accurately reach the false seam cutting position at the bottom of the front side of the guardrail, and avoiding the cutting blind spot caused by the fixed angle. Attached Figure Description

[0032] Figure 1 This is a diagram showing the usage status of the dummy joint cutting device for cast-in-place bridge railings according to the present invention.

[0033] Figure 2 This is a schematic diagram of the structure of a dummy joint cutting device for cast-in-place bridge railings according to the present invention.

[0034] Figure 3 This is a diagram showing the pressure arm in the lowered position.

[0035] Figure 4 yes Figure 3 Enlarged view of point A in the middle.

[0036] Figure 5 This is a diagram showing the state of the pressure arm being raised.

[0037] Figure 6 This is a partial schematic diagram of the first guide rail.

[0038] Figure 7 This is a partial schematic diagram of the second guide rail.

[0039] Figure 8 This is an assembly diagram of the fixed frame, grooving machine, and traveling mechanism.

[0040] Figure 9 This is a schematic diagram of the assembly of the fixed frame and the angle adjustment mechanism.

[0041] Figure 10 This is a schematic diagram of the inside of the angle adjustment mechanism.

[0042] Figure 11 This is a schematic diagram of a grooving machine.

[0043] Figure 12 This is a schematic diagram of the walking mechanism.

[0044] In the diagram, 1. Guardrail; 2. Contour guide rail; 21. First guide rail; 22. Second guide rail; 23. Counterweight platform; 24. Connecting plate; 25. Hinge; 26. Slide rail; 27. Locking seat; 28. Locking bolt; 29. ​​Pressure arm; 210. Pressure rod; 211. Fixed seat; 212. Connecting shaft; 213. Caster; 214. Rack; 215. Rubber pad; 3. Fixed frame; 31. Fixed plate; 32. Support arm; 33. 34. Threaded sleeve; 35. Pipe clamp; 36. Clamp; 4. Fixed shaft; 4. Grooving machine; 41. Dust cover; 42. Nozzle; 5. Angle adjustment mechanism; 51. Housing; 52. Rotating shaft; 53. Worm gear; 54. Flange; 55. Worm; 6. Traveling mechanism; 61. Vertical plate; 62. Traveling wheel; 63. Adjusting screw; 64. Adjusting groove; 65. Motor base; 66. Drive motor; 67. Reducer; 68. Gear. Detailed Implementation

[0045] The following will be combined with the appendix Figures 1-12 The technical solutions in the embodiments of the present invention are clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0046] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0047] A device for cutting dummy joints in cast-in-place bridge railings includes a contour guide rail 2, a fixing frame 3, and a traveling mechanism 6, such as... Figure 1 As shown, the contour guide rail 2 conforms to the shape of the guardrail 1. The contour guide rail 2 is configured in two sets, with the two ends of the two sets connected by a connecting plate 24. Figure 6 As shown, one set of contour guide rails 2 has a rack 214 inside that is arranged along the contour guide rail 2.

[0048] The mounting bracket 3 is used to fix the grooving machine 4, such as Figure 8 , Figure 9 , Figure 11 As shown, the fixing frame 3 includes a clamp 35 fixedly sleeved on the grooving machine 4, and fixing shafts 36 on both sides of the clamp 35. It also includes two sets of fixing plates 31 set on both sides of the grooving machine 4. The ends of the fixing shafts 36 pass through the fixing plates 31 and are locked to the fixing plates 31 by nuts. The lower part of the fixing plates 31 is provided with fastening bolts that connect to the side of the grooving machine 4. Support arms 32 are fixedly connected to the ends of the fixing plates 31 on both sides.

[0049] The traveling mechanism 6 is used to drive the grooving machine 4 to move along the contour guide rail 2, thereby achieving the cutting of dummy seams, such as... Figure 8 , Figure 12 As shown, the walking mechanism 6 includes two sets of upright plates 61. The lower part of the upright plate 61 is provided with walking wheels 62, which are set inside the contour guide rail 2. The support arm 32 is connected to the upright plate 61. One side of one set of upright plates 61 is connected to a motor base 65. A drive motor 66 and a reducer 67 are installed on one side of the motor base 65. A gear 68 is fixedly connected to the output shaft of the reducer 67, and the gear 68 meshes with the rack 214.

[0050] The contour guide rail 2 conforms to the shape of the guardrail 1, and the traveling wheel 62 of the traveling mechanism 6 is embedded in the guide rail for limiting, so that the grooving machine 4 moves at a constant speed along the preset trajectory of the contour guide rail 2. This not only reduces the labor intensity of the operators, but also solves the problems of slit tilt, offset, and uneven vertical alignment that exist in manual cutting, ensuring the quality and consistency of slit cutting and improving the efficiency of slit cutting.

[0051] like Figure 3As shown, a rubber pad 215 is provided on the contact surface between the contour guide rail 2 and the guardrail 1 to prevent the contour guide rail 2 from scratching the guardrail.

[0052] like Figure 1 , Figure 2 As shown, the contour guide rail 2 is provided with a counterweight platform 23 at one end in front of the guardrail 1. The counterweight platform 23 is provided with a counterweight block, which further ensures the stability of the device when cutting the dummy seam.

[0053] like Figure 2 , Figure 3 As shown, the contour guide rail 2 includes a first guide rail 21 disposed on the upper and front sides of the guardrail 1 and a second guide rail 22 disposed on the back of the guardrail 1. The first guide rail 21 and the second guide rail 22 are movably connected by a hinge 25.

[0054] Because cast-in-place bridge railings are not regular rectangular structures, the integrated contour guide rail 2, limited by its shape, can only be fitted from the end of the railing and slid along its length to the target cutting position, which is cumbersome and has poor adaptability. In this solution, the first guide rail 21 and the second guide rail 22 are movably connected by a hinge 25, which can be flexibly opened or disassembled according to the local shape of the railing. It does not need to be fitted as a whole from the end of the railing, and can be assembled directly at the target cutting position, improving the efficiency of the cutting device installation.

[0055] Furthermore, the integrated contour guide rail 2 needs to be inserted from the end of the guardrail and slide a long distance to the cutting position. During the sliding process, the guide rail is in close contact with the guardrail surface, which can easily cause scratches and chipping of the concrete surface due to friction and impact. This damage is especially severe for guardrails with initially set concrete, affecting the appearance quality and structural density of the guardrail. In contrast, this solution uses a movable track design that can be directly opened and closed at the target cutting position without moving the guide rail along the length of the guardrail. This avoids scratching the guardrail surface and effectively protects the aesthetics and integrity of the guardrail's concrete surface.

[0056] like Figure 3 , Figure 5As shown, a connecting shaft 212 is rotatably connected to one side of the first guide rail 21, and a pressure arm 29 is fixedly connected to the connecting shaft 212. The pressure arm 29 has an L-shaped structure, and a pressure rod 210 is provided at one end of the pressure arm 29. A fixing seat 211 is fixedly installed on one side of the second guide rail 22. The fixing seat 211 has a pressure groove for accommodating the pressure rod 210. After the pressure arm 29 is lowered, the pressure rod 210 is inserted into the pressure groove. A slide rail 26 is provided on one side of the first guide rail 21, and a locking seat 27 is slidably installed on the slide rail 26. A locking device is threaded onto the locking seat 27. Bolt 28, after being tightened, abuts against slide rail 26; after pressure arm 29 is lowered, pressure rod 210 is precisely inserted into the pressure groove of fixed seat 211, forming a preliminary positioning constraint. Then, the locking seat 27 is slid to the upper part of pressure arm 29 through slide rail 26, and the locking bolt 28 is tightened to make the locking seat 27 abut against slide rail 26 and fixed. Using the vertical pressing force of locking seat 27 on pressure arm 29, the second guide rail 22 is tightly attached to the surface of guardrail 1, eliminating the jumping of the second guide rail 22 during cutting operation, avoiding fluctuations in the depth of the cut, and ensuring the accuracy of dummy cut.

[0057] like Figure 5 As shown, the contact surface between the locking seat 27 and the pressure arm 29 is an inclined surface, which facilitates the compensation for deformation and wear of the locking seat 27 after long-term use and ensures the locking effect of the locking seat 27.

[0058] like Figure 4 As shown, one end of the pressure arm 29 is provided with a caster 213. The caster 213 includes a wheel frame and a roller rotatably disposed on one side of the wheel frame. The wheel frame is fixedly connected to the connecting shaft 212. When the pressure arm 29 is lowered, the caster 213 is separated from the top surface of the guardrail 1. When the pressure arm 29 is raised, the caster 213 is supported on the top surface of the guardrail 1.

[0059] The caster 213 not only reduces the frictional resistance between the device and the guardrail during device transfer, but also, when the device needs to be transferred to the next cutting position, first loosen the locking seat 27, then lift the pressure arm 29. During the lifting of the pressure arm 29, the caster 213 first contacts the top surface of the guardrail 1 to form a support fulcrum. When force is applied, the torque of the pressure arm 29 is converted into a lateral pushing force on the first guide rail 21, pushing the first guide rail 21 towards the front of the guardrail 1 and separating it from the surface of the guardrail 1. Then the second guide rail 22 is lifted. At this time, the contour guide rail 2 does not contact the guardrail during device transfer, avoiding the risk of friction and collision between the contour guide rail 2 and the guardrail surface during device transfer.

[0060] like Figure 11 As shown, the cutting blade of the grooving machine 4 is equipped with a dust cover 41, and the dust cover 41 is provided with several nozzles 42. The nozzles 42 are connected to water pipes for dust reduction and cooling of the cutting blade during the slit cutting process; Figure 9As shown, the fixing plate 31 is provided with several pipe clamps 34 for fixing water pipes and preventing the water pipes from being accidentally cut by the grooving machine 4.

[0061] like Figure 12 As shown, the upright plate 61 is provided with an adjustment groove 64, such as Figure 8 As shown, one end of the support arm 32 passes through the adjustment groove 64 and is fixedly connected to a threaded sleeve 33. The upper end of the upright plate 61 is rotatably connected to an adjustment screw 63. The adjustment screw 63 is threadedly connected to the threaded sleeve 33, which facilitates the adjustment of the height of the fixing frame 3, thereby adjusting the cutting depth of the dummy seam.

[0062] like Figure 9 As shown, the support arm 32 has a two-section structure, with connecting flanges at the ends of both sections. An angle adjustment mechanism 5 is provided between the two sections to adjust the tilt angle of the fixing frame 3. Figure 10 As shown, the angle adjustment mechanism 5 includes a housing 51, one side of which is connected to one of the connecting flanges. A rotating shaft 52 is rotatably connected inside the housing 51. A worm gear 53 is fixedly connected to the rotating shaft 52. A flange 54 is provided at one end of the rotating shaft 52, and the flange 54 is connected to another connecting flange. A worm 55 is engaged on one side of the worm gear 53, and a handwheel is provided at one end of the worm 55. With the help of the two-section support arm 32 and the angle adjustment mechanism 5, the tilt angle of the fixed frame 3 can be flexibly adjusted by rotating the handwheel, so that the grooving machine 4 deflects around the connection of the support arm 32, avoiding interference from the ground or surrounding obstacles, ensuring that the cutting blade can accurately reach the false seam cutting position at the bottom of the front side of the guardrail, and avoiding the cutting blind zone caused by the fixed angle.

[0063] The process of using the dummy joint cutting device for cast-in-place bridge railings is as follows:

[0064] I. Construction Preparation Stage:

[0065] Before cutting, clean the surface of the guardrail 1 area to be cut of debris and laitance, and mark the dummy joint positions on the guardrail according to the design requirements. Confirm that the rubber pads 215 of the contour guide rail 2 are undamaged, the hinges 25 rotate flexibly, the traveling wheels 62 roll smoothly, the gears 68 and racks 214 mesh without jamming, the drive motor 66 and reducer 67 are operating normally, the cutting disc of the grooving machine 4 is intact, the dust cover 41 and nozzles 42 are not blocked, and the water pipes and pipe clamps 34 are complete.

[0066] II. Installation and Fixing of Contour Rail 2:

[0067] For the marked dummy joint positions, separate the first guide rail 21 (fitting the upper and front sides of the guardrail) and the second guide rail 22 (fitting the back of the guardrail): Utilizing the movable connection characteristics of the hinge 25 of the two, without the need to be fitted from the end of the guardrail, directly cut the two guide rails at the target cutting position to fit the shape of the guardrail, so that the rubber pad 215 of the guide rail fits tightly against the surface of the guardrail (to avoid scratching the concrete).

[0068] Align the cutting blade of the grooving machine 4 with the dummy seam marking line, and place a counterweight on the counterweight platform 23 located in front of the guardrail on the first guide rail 21 to enhance the overall stability of the device during cutting and prevent the guide rail from shifting due to vibration during high-altitude operations.

[0069] Lower the L-shaped pressure arm 29 so that the pressure rod 210 at one end of the pressure arm 29 is precisely engaged in the pressure groove of the fixing seat 211 of the second guide rail 22, forming a preliminary positioning; slide the locking seat 27 along the slide rail 26 of the first guide rail 21 to the upper part of the pressure arm 29, tighten the locking bolt 28 so that the locking seat 27 abuts against the slide rail 26 and is fixed. The wedge effect generated by the inclined contact surface between the locking seat 27 and the pressure arm 29 firmly presses the second guide rail 22 against the back of the guardrail, preventing the guide rail from jumping during cutting.

[0070] III. Assembly and Adjustment of the Slotting Machine 4:

[0071] Fix the clamp 35 to the outside of the grooving machine 4, and pass the fixing shafts 36 on both sides of the clamp 35 through the fixing plate 31 and lock them with nuts. Then tighten the fastening bolts at the bottom of the fixing plate 31 to press against the side of the grooving machine 4, thus achieving double fixation of the grooving machine 4 and ensuring no displacement during the cutting process. Connect the support arms 32 on both sides of the fixing frame 3 to the upright plate 61 of the traveling mechanism 6, so that the traveling wheel 62 is embedded in the inside of the contour guide rail 2 for limit, while ensuring that the gear 68 on the output shaft of the drive motor 66 meshes precisely with the rack 214 in the guide rail.

[0072] Based on the preset cutting depth of 30mm, rotate the adjusting screw 63 at the upper end of the vertical plate 61. Through the threaded transmission between the screw and the threaded sleeve 33, drive the support arm 32 to move up and down along the adjusting groove 64, and simultaneously adjust the height of the grooving machine 4 so that the cutting depth of the cutting blade is accurately met, avoiding damage to the steel bars due to excessive depth or failure to disperse stress due to insufficient depth.

[0073] When cutting the bottom front side of the guardrail, turn the handwheel of the angle adjustment mechanism 5 of the support arm 32, and drive the rotating shaft 52 to rotate through the worm gear 53 and worm 55. Adjust the tilt angle of the two support arms 32, so that the grooving machine 4 deflects around the connection of the support arms 32, avoids interference from the ground or surrounding obstacles, and ensures that the cutting blade accurately reaches the target cutting position.

[0074] Secure the water pipe along the pipe clamp 34 on the fixing plate 31 (to prevent the water pipe from getting tangled or being cut by the grooving machine 4), and align the nozzle 42 on the dust cover 41 with the contact area between the cutting blade and the guardrail to ensure that the water flow can cover the cutting surface.

[0075] IV. Pretend seam cutting operation:

[0076] Turn on the water source and ensure that the nozzle 42 sprays water normally to form a water mist that envelops the cutting area, preparing for dust suppression and cooling of the cutting disc. Start the drive motor 66. After being reduced in speed by the reducer 67, the motor drives the gear 68 to rotate. Through the meshing transmission between the gear 68 and the rack 214, the walking mechanism 6 is driven to move at a constant speed along the contour guide rail 2, thereby driving the cutting disc of the grooving machine 4 to rotate at high speed for cutting.

[0077] V. Equipment Transfer and Continuous Operation:

[0078] After the single dummy joint cutting is completed, turn off the drive motor 66 and water supply, loosen the locking bolt 28 of the locking seat 27, and slide the locking seat 27 away from the pressure arm 29. Lift the pressure arm 29. The caster 213 at one end of the pressure arm 29 first contacts the top surface of the guardrail 1 to form a support fulcrum. Continue to lift the pressure arm 29 to 90 degrees, and use the leverage torque to push the first guide rail 21 towards the front of the guardrail 1, so that the guide rail is completely separated from the guardrail 1. Then lift the second guide rail 22 to release the contact constraint between the guide rail and the guardrail. With the rolling support of the caster 213, the construction personnel can apply a small pushing force to drive the device to move smoothly along the top surface of the guardrail 1. During the transfer, the guide rail does not contact the guardrail to avoid scratching the concrete surface. Move the device to the next dummy joint mark position and repeat the above steps until all dummy joint cuttings are completed.

[0079] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the scope defined by the structure of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A device for cutting dummy joints in cast-in-place bridge railings, comprising: The contour guide (2) conforms to the shape of the guardrail (1). The contour guide (2) is set in two sets, and the two ends of the two sets of contour guides (2) are connected by a connecting plate (24). One set of contour guides (2) has a rack (214) inside that is set along the contour guide (2). The feature is that it also includes a fixing frame (3) for fixing the grooving machine (4), including a clamp (35) fixedly sleeved on the grooving machine (4), and fixing shafts (36) on both sides of the clamp (35). It also includes two sets of fixing plates (31) set on both sides of the grooving machine (4). The ends of the fixing shafts (36) pass through the fixing plates (31) and are locked to the fixing plates (31) by nuts. The lower part of the fixing plates (31) is provided with fastening bolts connected to the side of the grooving machine (4). Support arms (32) are fixedly connected to the ends of the fixing plates (31) on both sides. The traveling mechanism (6) is used to drive the grooving machine (4) to travel along the contour guide rail (2). It includes two sets of upright plates (61). The lower part of the upright plate (61) is provided with a traveling wheel (62). The traveling wheel (62) is set inside the contour guide rail (2). The support arm (32) is connected to the upright plate (61). One side of one set of upright plates (61) is connected to a motor base (65). The motor base (65) is equipped with a drive motor (66) and a reducer (67) on one side. A gear (68) is fixedly connected to the output shaft of the reducer (67). The gear (68) meshes with the rack (214). The contour guide rail (2) includes a first guide rail (21) disposed on the upper and front sides of the guardrail (1) and a second guide rail (22) disposed on the back of the guardrail (1). The first guide rail (21) and the second guide rail (22) are movably connected by a hinge (25). A connecting shaft (212) is rotatably connected to one side of the first guide rail (21), and a pressure arm (29) is fixedly connected to the connecting shaft (212). The pressure arm (29) has an L-shaped structure, and a pressure rod (210) is provided at one end of the pressure arm (29). The second guide rail (22) A fixed base (211) is fixedly installed on one side of the first guide rail (21). The fixed base (211) is provided with a pressure groove to accommodate the pressure rod (210). After the pressure arm (29) is lowered, the pressure rod (210) is inserted into the pressure groove. A slide rail (26) is provided on one side of the first guide rail (21). A locking seat (27) is slidably installed on the slide rail (26). A locking bolt (28) is threadedly connected to the locking seat (27). After the locking bolt (28) is locked, it abuts against the slide rail (26). The contact surface between the locking seat (27) and the pressure arm (29) is an inclined surface.

2. The device for cutting dummy joints in cast-in-place bridge railings according to claim 1, characterized in that, A rubber pad (215) is provided on the contact surface between the contour guide rail (2) and the guardrail (1).

3. The device for cutting dummy joints in cast-in-place bridge railings according to claim 1, characterized in that, The contour guide rail (2) is provided with a counterweight platform (23) at one end in front of the guardrail (1), and a counterweight block is provided on the counterweight platform (23).

4. The device for cutting dummy joints in cast-in-place bridge railings according to claim 1, characterized in that, One end of the pressure arm (29) is provided with a caster (213). The caster (213) includes a wheel frame and a roller rotatably disposed on one side of the wheel frame. The wheel frame is fixedly connected to the connecting shaft (212). When the pressure arm (29) is lowered, the caster (213) is separated from the top surface of the guardrail (1). When the pressure arm (29) is raised, the caster (213) is supported on the top surface of the guardrail (1).

5. The device for cutting dummy joints in cast-in-place bridge railings according to claim 1, characterized in that, The cutting blade of the grooving machine (4) is provided with a dust cover (41), and the dust cover (41) is provided with a number of nozzles (42). The nozzles (42) are connected to water pipes and are used to reduce dust and cool the cutting blade during the slit cutting process. The fixing plate (31) is provided with a number of pipe clamps (34) for fixing the water pipes.

6. The device for cutting dummy joints in cast-in-place bridge railings according to claim 1, characterized in that, The upright plate (61) is provided with an adjustment groove (64). One end of the support arm (32) passes through the adjustment groove (64) and is fixedly connected to a threaded sleeve (33). The upper end of the upright plate (61) is rotatably connected to an adjustment screw (63). The adjustment screw (63) is threadedly connected to the threaded sleeve (33) for adjusting the height of the fixing frame (3).

7. A dummy joint cutting device for cast-in-place bridge railings according to any one of claims 1-6, characterized in that, The support arm (32) is a two-section structure. Both ends of the support arm (32) are provided with connecting flanges. An angle adjustment mechanism (5) is provided between the two support arms (32) for adjusting the tilt angle of the fixed frame (3). The angle adjustment mechanism (5) includes a housing (51). One side of the housing (51) is connected to one of the connecting flanges. A rotating shaft (52) is rotatably connected inside the housing (51). A worm gear (53) is fixedly connected on the rotating shaft (52). A flange (54) is provided at one end of the rotating shaft (52). The flange (54) is connected to the other connecting flange. A worm (55) is meshed on one side of the worm gear (53). A handwheel is provided at one end of the worm gear (55).

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