Gate-type baffle trolley and rapid construction method for railway bridge cast-in-place baffle

Abstract

The invention relates to the technical field of railway bridge construction, and particularly discloses a door type baffle trolley and a rapid construction method for a railway bridge cast-in-place method baffle. The gate-type baffle trolley comprises a device body, the device body comprises a cross beam arranged in the width direction of a bridge, and a walking frame used for supporting the cross beam is arranged below the cross beam. A first driving device for driving the walking frame to move is arranged at the walking frame; lifting tables are arranged at the two ends of the cross beam and comprise cross rods arranged in the length direction of the bridge, a construction platform is arranged below the cross rods, and a second driving device used for driving the construction platform to ascend or descend is arranged between the cross rods and the construction platform. The construction method comprises the steps of S1, steel bar installation; s2, a formwork is installed; s3, pouring and vibrating are conducted; s4, removing the mold; through the combination of the trolley and the construction method, the construction time is saved, and the construction efficiency of constructors is improved.

Description

Technical Field

[0001] This invention relates to the field of railway bridge construction technology, specifically to a gantry-type retaining trolley and a rapid construction method for cast-in-place retaining trolleys in railway bridges. Background Technology

[0002] A gantry crane is a device used for auxiliary work on the beam surface of railway and municipal bridges. It is used to complete the construction of concrete structures and is widely used in auxiliary work on the beam surface of various railway and municipal bridges. Most gantry cranes currently use a single-sided crane, which includes a car body and a lifting platform connected to the car body on one side. Construction workers start the motor, which drives the car body to move along one side of the bridge. Once it reaches the construction site, the lifting platform is lowered from one side of the bridge, and the construction workers stand on the lifting platform to carry out construction on one side of the bridge. Since the single-sided trolley only supports the working load on one side, it is prone to insufficient overall stability due to the shift of the center of gravity, and may overturn in strong winds or vibration environments. At the same time, after completing the work on one side, the single-sided trolley needs to be returned to the starting point and then moved to the other side of the bridge for construction, which results in low construction efficiency. Summary of the Invention

[0003] This invention provides a portal baffle trolley and a rapid construction method for cast-in-place baffles on railway bridges, which can overcome some or all the defects of the prior art.

[0004] According to the present invention, a gantry baffle trolley includes: a device body, the device body including a crossbeam arranged along the width direction of the bridge, a traveling frame for supporting the crossbeam provided below the crossbeam; a first driving device for driving the traveling frame to move is provided at the traveling frame; lifting platforms are provided at both ends of the crossbeam, the lifting platforms including crossbars arranged along the length direction of the bridge, a construction platform provided below the crossbars, and a second driving device for driving the construction platform to rise or fall is provided between the crossbars and the construction platform.

[0005] With this invention, when construction workers are building the crash barriers on both sides of a bridge, they first start the first motor on the gantry crane. The first motor drives the rollers to rotate, thereby driving the gantry crane onto the bridge deck. Then, the construction workers enter the lifting platforms at both ends of the crossbeam. The lifting machine lowers the construction platform to the designated position by raising and lowering the ropes. Then, the construction workers on the bridge deck and the construction workers in the lifting platforms work together to fix the pouring templates of the crash barriers on both sides of the bridge. As the gantry crane moves, the construction workers install and fix the templates on both sides of the bridge in sequence until all templates are installed. Compared with the prior art, this gantry crane allows for simultaneous construction on both sides of the bridge. A single-sided crane needs to move to the other side to assist in the installation of templates after the templates on one side of the bridge are installed, which is time-consuming. However, a double-sided crane only needs to move once to complete the template installation, improving construction efficiency. The symmetrical support on both sides ensures even load distribution and reduces the risk of overturning.

[0006] Preferably, the traveling frame includes two support frames, each including a base arranged along the length of the bridge, and two inclined support feet between the base and the crossbeam, with each end of the support foot connected to the base and the crossbeam respectively; rollers are provided below the base, and the first driving device includes a first motor located at the base for driving the rollers to rotate.

[0007] With this invention, when installing the traveling frame, the installer first installs two support frames. During installation, a crane is used to lift the crossbeam and support legs. Then, the installer uses a ladder truck to connect the upper end of the support legs to the connecting plate on the crossbeam. The lower end of the support legs is connected to the base by the installer on the ground. Bolts are used to pass through pre-drilled holes in the base and connecting plate to secure the support legs. Next, the base of the first motor is fixed to the base, and the wiring is connected to the rollers. The controller starts the first motor, driving the rollers to rotate, thus facilitating the movement of the gantry trolley.

[0008] Preferably, the lifting platform includes a crossbar arranged along the length of the bridge, an inclined brace between the crossbar and the crossbeam, one end of the inclined brace being connected to the crossbeam and the other end being connected to the crossbar; fixed pulleys are provided at both ends of the crossbar, a support platform is provided below the crossbar, and a hoist is provided at both ends of the support platform; a rope passing through the fixed pulley and the hoist is provided between the hoist and the fixed pulley.

[0009] With this invention, after the support legs are installed, the installers place the crossbar on top of the crossbeam, and then connect the diagonal bracing rod on the crossbeam to the crossbeam by welding, thereby fixing the crossbar. Then, the construction platform is lifted by a crane, the installers pass the rope through the fixed pulley, and finally the construction platform is lowered to complete the assembly of the gantry trolley. The construction workers can freely raise and lower the rope through the hoist on the construction platform to adjust the height of the construction platform, which is convenient for the construction workers to install the template.

[0010] Preferably, the crossbeam includes a main beam, with a reinforcing beam connected to the main beam above it; and a sliding beam connected to the main beam and having a T-shaped cross-section is provided below it.

[0011] The present invention provides a reinforcing beam to enhance the overall structural strength of the main beam.

[0012] Preferably, a winch is provided below the sliding beam, and a sliding seat connected to the winch is provided between the winch and the sliding beam. The upper end of the sliding seat is recessed downward to form a groove for the sliding beam to extend into. A pulley extending towards the sliding beam is provided on the inner side wall of the groove. A second motor for driving the pulley to rotate is provided on the outer side wall of the sliding seat.

[0013] With this invention, after the template is installed, the construction workers will pour concrete into the template. After the concrete solidifies, the template needs to be dismantled. During dismantling, the construction workers can use the second motor to drive the sliding seat to move and use a winch to lift the template, thereby assisting the construction workers in dismantling the template. When installing the template, the winch can also be used to lift the template and transport it to both ends of the gantry trolley to assist the construction workers in installing the template.

[0014] Preferably, the base has limiting blocks with triangular cross-sections at both ends, and a chain is provided between the limiting blocks and the base to connect the limiting blocks and the base.

[0015] With this invention, during the template installation process, the gantry trolley needs to stop after moving a certain distance to assist construction workers in installing the template. When the gantry trolley stops, the construction workers need to remove the limiting block from the base and place the limiting block against the roller to prevent the roller from continuing to move, ensuring that the gantry trolley is stationary and avoiding affecting the construction workers' work.

[0016] The limiting block is welded together from a base plate, triangular side plates, and a top plate.

[0017] Preferably, the main beam is provided with connecting plates on both sides for connecting the main beam and the support legs.

[0018] According to the present invention, the connecting plate is used to connect the support foot, and the connecting plate creates a gap between the support foot and the sliding beam, thereby preventing the sliding seat from being blocked by the support foot when it moves, which would prevent the sliding seat from moving to both ends of the gantry baffle trolley.

[0019] This invention provides a rapid construction method for cast-in-place retaining walls of railway bridges, implemented using the aforementioned gantry retaining wall trolley. The steps are as follows. S1. Reinforcing bar installation: First, the reinforcing bars are transported to the bridge. Then, the construction workers install the reinforcing bar cage on both sides of the bridge. First, the vertical main bars are tied and welded to the reinforcing bars that were previously embedded in the bridge. Then, the horizontal distribution bars are passed through and the distribution bars are connected to the main bars with binding wire. S2. Install the template. After the steel reinforcement cage is installed, the construction workers use the first drive device to drive the gantry trolley into the bridge deck. Then, the construction workers enter the lifting platforms at both ends of the crossbeam. The second drive device lowers the lifting platforms to the outside of the steel reinforcement cage. Then, the construction workers on the bridge deck and the construction workers in the lifting platforms work together to fix the templates to both sides of the steel reinforcement cage. Then, the construction workers set up templates at intervals along the length of the bridge. The adjacent templates are bolted together. The first drive device drives the gantry trolley to move along the length of the bridge until all templates are installed. S3. Pouring and Vibrating: After the formwork is installed, concrete is poured into the formwork. At the same time as the concrete is poured, the first drive device drives the gantry trolley to move, and the construction workers stand on the lifting platform to vibrate the concrete inside the formwork. S4. Formwork removal: After the concrete has solidified, the construction workers start the first drive device to move the gantry trolley on the bridge deck. The formwork is then removed by the cooperation of the construction workers on the bridge deck and the construction workers in the lifting platform.

[0020] Before installing the steel reinforcement frame, the bridge surface needs to be roughened. Construction workers remove any protrusions or concrete residue from the bridge surface and then wash it with a high-pressure water gun.

[0021] Apply a release agent to the contact surface between the formwork and the concrete before installation.

[0022] With this invention, the first step in construction is to transport the reinforcing bars to the construction site. After the reinforcing bars arrive, they should be visually inspected and accepted. Before installation, the bridge beam surface should be cleaned, and the bottom surface of the structure should be roughened according to the pop-up template edge lines. The root of the reinforcing bar should be roughened to 1-2cm to the outside of the reinforcing bar, with a depth of 0.5-1.0cm, and then rinsed with water to remove floating dust and debris, prevent concrete inclusion, and improve overall density. Then, the position and elevation of the reinforcing bar installation should be located by pulling lines according to the layout data. After the position and elevation are determined, the construction personnel should first tie the vertical main bars and weld them to the reinforcing bars that were previously embedded in the bridge. Then, the distribution bars should be passed horizontally through the main bars, and the distribution bars should be connected to the main bars with binding wire. After the reinforcing steel bars are tied, the formwork will be delivered to the site. Each section of the formwork will be 2 meters long and will be fixed together with bolts. After the formwork arrives on site, a trial assembly will be conducted to check the overall effect of the formwork after installation, whether the joints are smooth, and whether there are any gaps or obvious misalignments. It can only be used normally after the inspection is completed and found to be correct. Before installing the formwork, the quality of the reinforcing steel binding should be checked; the formwork surface should be checked to see if it is flat, smooth, and free from any unevenness or deformation, and the ash residue on the formwork and debris in the pipe holes should be removed; check the weld joints of the formwork for cracks or damage, and if any are found, they should be repaired and welded in time to meet the required standards. After inspection, the formwork installation begins. Workers use the first drive device to propel the gantry trolley onto the bridge deck. Then, workers enter the lifting platforms at both ends of the crossbeams. The second drive device lowers the lifting platforms to the outside of the reinforcing steel frame. Workers on the bridge deck and those on the lifting platforms work together to secure the formwork to both sides of the reinforcing steel frame. Workers then install formwork at intervals along the bridge's length, bolting adjacent formwork together. The first drive device moves the gantry trolley along the bridge's length until all formwork is installed. During installation, a winch lifts the formwork, and a sliding seat moves the winch to the construction platform. Workers then secure the formwork with bolts. The outer formwork is installed first, followed by the inner formwork.

[0023] After all the formwork is installed, concrete is poured into the formwork using a concrete mixer truck. Then, a gantry crane is started and moves across the bridge deck. Construction workers stand on the lifting platform to vibrate the concrete inside the formwork. This eliminates the need for workers to stand on the formwork to vibrate the concrete, preventing damage to the formwork. It also reduces the physical exertion of workers by eliminating the need for them to walk around. After vibration, once the concrete has solidified, the gantry crane is started again. The sliding seat is driven by a second motor to move, which in turn moves a winch. The hook below the winch catches the formwork to be removed. Then, the workers loosen the bolts connecting the formwork, and the winch lifts it up and removes it, making it easier for workers to dismantle the formwork more quickly.

[0024] Before the formwork is installed, it needs to be lifted by a winch. The construction workers apply a release agent to the contact surface between the formwork and the concrete to make it easy to remove the formwork after the concrete has solidified, thus preventing the concrete from sticking to the formwork.

[0025] The template uses standardized steel molds, each 2 meters long. Reinforcement is achieved through inner tie rods and outer supports. End templates also use steel molds, secured with tie rods. Custom-made steel plates are used for the joints, resulting in 1cm wide true joints after demolding, ensuring the concrete of the crash barrier remains crack-free and maintains a good appearance. During installation, the inner and outer templates are tightly fitted to the concrete base and secured with bolts and tie rods. Two tie rods are installed at the bottom and top, spaced 100cm apart. After both inner and outer templates are installed, precise adjustments to the verticality and alignment of the templates are made until they meet specifications. After installation, the templates must be thoroughly inspected, primarily checking the installation dimensions, the firmness of all fixing points, and whether the top elevation and verticality are within the allowable range specified in the specifications. This ensures the template alignment meets requirements, and adjustments are made to any areas exceeding the standards. Reliable joint sealing measures must be used to prevent grout leakage. After installation, the templates must be thoroughly cleaned before being handed over to the next process.

[0026] By combining the gantry trolley with the rapid construction method of cast-in-place retaining walls for railway bridges, compared with the traditional retaining wall trolley which only has the ability to construct on one side, the gantry trolley can realize simultaneous construction on both sides; it saves construction time and improves the construction efficiency of construction personnel; in addition, the gantry trolley is equipped with mechanical devices such as winches and hoists to assist construction personnel in installing and dismantling formwork, which speeds up the construction process; and it eliminates the need to park other equipment on the bridge deck and occupy production space. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the main body of the device in Example 1.

[0028] Figure 2 This is a schematic diagram of the crossbeam in Example 1.

[0029] Figure 3 This is a schematic diagram of the fit between the support foot and the base in Example 1.

[0030] Figure 4 This is a schematic diagram of the lifting platform in Example 1.

[0031] Figure 5 This is a schematic diagram of the limiting block in Example 1.

[0032] Figure 6 This is a schematic diagram of the winch in Example 1. Detailed Implementation

[0033] To further understand the content of this invention, the invention will be described in detail with reference to the embodiments. It should be understood that the embodiments are merely illustrative and not limiting of the invention.

[0034] Example 1 like Figure 1-6As shown, this embodiment provides a gantry-type baffle trolley, including a device body 100. The device body 100 includes a crossbeam 200 arranged along the width direction of the bridge. A traveling frame 130 for supporting the crossbeam 200 is provided below the crossbeam 200. A first driving device for driving the traveling frame 130 to move is provided at the traveling frame 130. Lifting platforms 110 are provided at both ends of the crossbeam 200. The lifting platform 110 includes a crossbar 420 arranged along the length direction of the bridge. A construction platform 450 is provided below the crossbar 420. A second driving device for driving the construction platform 450 to rise or fall is provided between the crossbar 420 and the construction platform 450.

[0035] In this embodiment, when construction workers are building the crash barriers on both sides of the bridge, they first start the first motor 120 on the gantry crane. The first motor 120 drives the roller 150 to rotate, thereby driving the gantry crane onto the bridge deck. Then, the construction workers enter the lifting platforms 110 at both ends of the crossbeam 200. The hoist 440 raises and lowers the construction platform 450 to the designated position. Then, the construction workers on the bridge deck and the construction workers in the lifting platforms 110 work together to fix the casting templates of the crash barriers on both sides of the bridge. As the gantry crane moves, the construction workers install and fix the templates on both sides of the bridge in sequence until all templates are installed. Compared with the prior art, this gantry crane allows for simultaneous construction on both sides of the bridge. A single-sided crane needs to move to the other side to assist in the installation of templates after the templates on one side of the bridge are installed, which is time-consuming. However, a double-sided crane only needs to move once to complete the template installation, improving construction efficiency. The symmetrical support on both sides ensures even load distribution and reduces the risk of overturning.

[0036] In this embodiment, the walking frame 130 includes two support frames. Each support frame includes a base 320 arranged along the length of the bridge. Two inclined support feet 310 are provided between the base 320 and the crossbeam 200. The two ends of the support feet 310 are connected to the base 320 and the crossbeam 200, respectively. A roller 150 is provided below the base 320. The first driving device includes a first motor 120 disposed at the base 320 and used to drive the roller 150 to rotate.

[0037] In this embodiment, when installing the traveling frame 130, the installer first installs two support frames. During installation, the crossbeam 200 and support legs 310 are first lifted by a crane. Then, the installer uses a ladder truck to connect the upper end of the support leg 310 to the connecting plate 210 on the crossbeam 200. The lower end of the support leg 310 is connected to the base 320 by the installer on the ground. During connection, bolts are passed through pre-drilled holes in the base 320 and connecting plate 210, and the support leg 310 is secured with bolts. Next, the base of the first motor 120 is fixed to the base 320, and the wiring is connected to the rollers 150. The controller starts the first motor 120, driving the rollers 150 to rotate, thus facilitating the movement of the gantry trolley.

[0038] In this embodiment, the lifting platform 110 includes a crossbar 420 arranged along the length of the bridge. An inclined brace 410 is provided between the crossbar 420 and the crossbeam 200. One end of the inclined brace 410 is connected to the crossbeam 200, and the other end is connected to the crossbar 420. Fixed pulleys 430 are provided at both ends of the crossbar 420. A support platform 450 is provided below the crossbar 420. A hoist 440 is provided at both ends of the support platform 450. A rope passing through the fixed pulley 430 and the hoist 440 is provided between the hoist 440 and the fixed pulley 430.

[0039] In this embodiment, after the support leg 310 is installed, the installer places the crossbar 420 above the crossbeam 200, and then connects the diagonal brace 410 on the crossbeam 200 to the crossbeam 200 by welding, thereby fixing the crossbar 420. Then, the construction platform 450 is lifted by a crane, and the installer passes the rope through the fixed pulley 430. Finally, the construction platform 450 is lowered to complete the assembly of the gantry trolley. The construction workers can freely raise and lower the rope through the hoist 440 on the construction platform 450 to adjust the height of the construction platform 450, which is convenient for the construction workers to install the template.

[0040] In this embodiment, the crossbeam 200 includes a main beam 260, a reinforcing beam 270 connected to the main beam 260 is provided above the main beam 260, and a sliding beam 250 connected to the main beam 260 and having a T-shaped cross-section is provided below the main beam 260.

[0041] In this embodiment, the reinforcing beam 270 is used to improve the overall structural strength of the main beam 260.

[0042] In this embodiment, a winch 220 is provided below the sliding beam 250, and a sliding seat 230 connected to the winch 220 is provided between the winch 220 and the sliding beam 250. The upper end of the sliding seat 230 is recessed downward to form a groove 610 for the sliding beam 250 to extend into. A pulley 620 extending towards the sliding beam 250 is provided on the inner side wall of the groove 610. A second motor 240 for driving the pulley 620 to rotate is provided on the outer side wall of the sliding seat 230.

[0043] In this embodiment, after the template is installed, the construction workers will pour concrete into the template. After the concrete solidifies, the template needs to be dismantled. During dismantling, the construction workers can use the second motor 240 to drive the sliding seat 230 to move, and use the winch 220 to lift the template, thereby assisting the construction workers in dismantling the template. When installing the template, the winch 220 can also be used to lift the template and transport it to both ends of the gantry trolley to assist the construction workers in installing the template.

[0044] In this embodiment, the base 320 is provided with limiting blocks 140 with triangular cross-section at both ends, and a chain 330 is provided between the limiting blocks 140 and the base 320. The chain 330 is used to connect the limiting blocks 140 and the base 320.

[0045] In this embodiment, during the template installation process, the gantry trolley needs to stop after moving a certain distance to assist the construction workers in installing the template. When the gantry trolley stops, the construction workers need to remove the limiting block 140 from the base 320 and place the limiting block 140 against the roller 150 to prevent the roller 150 from continuing to move, ensuring that the gantry trolley is stationary and avoiding affecting the construction workers' work.

[0046] The limiting block 140 is welded together from the base plate 530, the triangular side plate 510 and the top plate.

[0047] In this embodiment, connecting plates 210 for connecting the main beam 260 and the support legs 310 are provided on both sides of the main beam 260.

[0048] In this embodiment, the connecting plate 210 is used to connect the support foot 310. The connecting plate 210 creates a gap between the support foot 310 and the sliding beam 250, thereby preventing the sliding seat 230 from being blocked by the support foot 310 when it moves, which would prevent the sliding seat 230 from moving to both ends of the gantry baffle trolley.

[0049] This embodiment provides a rapid construction method for cast-in-place retaining walls on railway bridges, implemented using the aforementioned gantry retaining wall trolley. The steps are as follows. S1. Reinforcing bar installation: First, the reinforcing bars are transported to the bridge. Then, the construction workers install the reinforcing bar cage on both sides of the bridge. First, the vertical main bars are tied and welded to the reinforcing bars that were previously embedded in the bridge. Then, the horizontal distribution bars are passed through and the distribution bars are connected to the main bars with binding wire. S2. Install the template. After the steel reinforcement cage is installed, the construction workers use the first drive device to drive the gantry trolley into the bridge deck. Then, the construction workers enter the lifting platforms 110 at both ends of the crossbeam 200. The second drive device lowers the lifting platforms 110 to the outside of the steel reinforcement cage. Then, the construction workers on the bridge deck and the construction workers in the lifting platforms 110 work together to fix the template to both sides of the steel reinforcement cage. Then, the construction workers set up templates at intervals along the length of the bridge. The adjacent templates are bolted together. The first drive device drives the gantry trolley to move along the length of the bridge until all templates are installed. S3. Pouring and Vibrating: After the formwork is installed, concrete is poured into the formwork. At the same time as the concrete is poured, the first drive device drives the gantry trolley to move, and the construction workers stand on the lifting platform 110 to vibrate the concrete in the formwork. S4. Formwork removal: After the concrete has solidified, the construction workers start the first drive device to move the gantry trolley on the bridge deck. The formwork is then removed by the cooperation of the construction workers on the bridge deck and the construction workers in the lifting platform 110.

[0050] Before installing the steel reinforcement frame, the bridge surface needs to be roughened. Construction workers remove any protrusions or concrete residue from the bridge surface and then wash it with a high-pressure water gun.

[0051] Apply a release agent to the contact surface between the formwork and the concrete before installation.

[0052] In this embodiment, the first step in construction is to transport the reinforcing bars to the construction site. After the reinforcing bars arrive, they should be visually inspected and accepted. Before installation, the bridge beam surface should be cleaned. The bottom surface of the structure should be roughened according to the pop-up template edge lines. The root of the reinforcing bar should be roughened to 1-2cm from the outside of the reinforcing bar, with a depth of 0.5-1.0cm. It should then be rinsed with water to remove loose dust and debris, prevent concrete inclusion, and improve overall density. Then, the position and elevation of the reinforcing bars should be located by pulling lines according to the layout data. After the position and elevation are determined, the construction personnel should first tie the vertical main bars and weld them to the reinforcing bars that were previously embedded in the bridge. Then, the distribution bars should be passed horizontally through the main bars and connected to the main bars with binding wire. After the reinforcing steel bars are tied, the formwork will be delivered to the site. Each section of the formwork will be 2 meters long and will be fixed together with bolts. After the formwork arrives on site, a trial assembly will be conducted to check the overall effect of the formwork after installation, whether the joints are smooth, and whether there are any gaps or obvious misalignments. It can only be used normally after the inspection is completed and found to be correct. Before installing the formwork, the quality of the reinforcing steel binding should be checked; the formwork surface should be checked to see if it is flat, smooth, and free from any unevenness or deformation, and the ash residue on the formwork and debris in the pipe holes should be removed; check the weld joints of the formwork for cracks or damage, and if any are found, they should be repaired and welded in time to meet the required standards. After inspection, the template installation begins. Workers use the first drive device to propel the gantry trolley onto the bridge deck. Then, workers enter the lifting platforms 110 at both ends of the crossbeam 200. The second drive device lowers the lifting platforms 110 to the outside of the reinforcing steel frame. Workers on the bridge deck and inside the lifting platforms 110 then work together to fix the templates to both sides of the reinforcing steel frame. Workers then install templates at intervals along the bridge length, connecting adjacent templates with bolts. The first drive device moves the gantry trolley along the bridge length until the gantry trolley and workers complete the installation of all templates. During template installation, a winch 220 lifts the template, and a sliding seat 230 moves the winch 220 to the construction platform 450. Workers then secure the templates with bolts. The outer templates are installed first, followed by the inner templates.

[0053] After all the formwork is installed, concrete is poured into the formwork using a concrete mixer truck. Then, the gantry crane is started and moves across the bridge deck. Construction workers stand on the lifting platform 110 to vibrate the concrete inside the formwork. This eliminates the need for workers to stand on the formwork to vibrate the concrete, preventing damage to the formwork. It also reduces the physical exertion of workers by eliminating the need for them to move around. After vibration, once the concrete has solidified, the gantry crane is started again. The second motor 240 drives the sliding seat 230 to move, which in turn moves the winch 220. The hook below the winch 220 hooks onto the formwork to be removed. Then, the workers loosen the bolts connecting the formwork, and the winch 220 lifts and removes it, making it easier for workers to dismantle the formwork more quickly.

[0054] Before the formwork is installed, it needs to be lifted by a winch 220. The construction workers apply a release agent to the contact surface between the formwork and the concrete to make it easy to remove the formwork after the concrete has solidified, thus avoiding adhesion between the concrete and the formwork.

[0055] The template uses standardized steel molds, each 2 meters long. Reinforcement is achieved through inner tie rods and outer supports. End templates also use steel molds, secured with tie rods. Custom-made steel plates are used for the joints, resulting in 1cm wide true joints after demolding, ensuring the concrete of the crash barrier remains crack-free and maintains a good appearance. During installation, the inner and outer templates are tightly fitted to the concrete base and secured with bolts and tie rods. Two tie rods are installed at the bottom and top, spaced 100cm apart. After both inner and outer templates are installed, precise adjustments to the verticality and alignment of the templates are made until they meet specifications. After installation, the templates must be thoroughly inspected, primarily checking the installation dimensions, the sturdiness of all fixing points (tips, supports, etc.), and ensuring the top elevation and verticality are within acceptable limits. This ensures the template alignment meets requirements, and adjustments are made to any deviations. Reliable joint sealing measures must be used to prevent grout leakage. After installation, the templates must be thoroughly cleaned before being handed over to the next process.

[0056] By combining the gantry trolley with the rapid construction method of cast-in-place slabs for railway bridges, compared with the traditional gantry trolley which only has the ability to construct on one side, the gantry trolley can realize simultaneous construction on both sides; it saves construction time and improves the construction efficiency of construction personnel; in addition, the gantry trolley is equipped with mechanical devices such as winches 220 and hoists 440 to assist construction personnel in installing and dismantling formwork, which speeds up the construction process; and it eliminates the need to park other equipment on the bridge deck and occupy production space.

[0057] It is readily understood that those skilled in the art can combine, split, or reorganize the embodiments provided in this application to obtain other embodiments, all of which do not exceed the protection scope of this application.

[0058] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the embodiments shown are only part of the embodiments of the present invention. The actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A gantry-type baffle trolley, characterized in that: The device includes a main body (100), which includes a crossbeam (200) arranged along the width of the bridge. A traveling frame (130) is provided below the crossbeam (200) to support the crossbeam (200). A first driving device is provided at the traveling frame (130) to drive the traveling frame (130) to move. Lifting platforms (110) are provided at both ends of the crossbeam (200). The lifting platform (110) includes a crossbar (420) arranged along the length of the bridge. A construction platform (450) is provided below the crossbar (420). A second driving device is provided between the crossbar (420) and the construction platform (450) to drive the construction platform (450) to rise or fall.

2. The gantry-type baffle trolley according to claim 1, characterized in that: The traveling frame (130) includes two support frames. Each support frame includes a base (320) arranged along the length of the bridge. Two inclined support feet (310) are provided between the base (320) and the crossbeam (200). The two ends of the support feet (310) are connected to the base (320) and the crossbeam (200) respectively. A roller (150) is provided below the base (320). The first driving device includes a first motor (120) located at the base (320) and used to drive the roller (150) to rotate.

3. A gantry baffle trolley according to claim 2, characterized in that: The lifting platform (110) includes a crossbar (420) arranged along the length of the bridge. An inclined brace (410) is provided between the crossbar (420) and the crossbeam (200). One end of the brace (410) is connected to the crossbeam (200), and the other end is connected to the crossbar (420). Fixed pulleys (430) are provided at both ends of the crossbar (420). A support platform (450) is provided below the crossbar (420). A hoist (440) is provided at both ends of the support platform (450). A rope is provided between the hoist (440) and the fixed pulley (430) and passes through the fixed pulley (430) and the hoist (440).

4. A gantry baffle trolley according to claim 3, characterized in that: The crossbeam (200) includes a main beam (260), a reinforcing beam (270) connected to the main beam (260) is provided above the main beam (260), and a sliding beam (250) connected to the main beam (260) and having a T-shaped cross section is provided below the main beam (260).

5. A gantry baffle trolley according to claim 4, characterized in that: A winch (220) is provided below the sliding beam (250). A sliding seat (230) connected to the winch (220) is provided between the winch (220) and the sliding beam (250). The upper end of the sliding seat (230) is recessed downward to form a slot (610) into which the sliding beam (250) extends. A pulley (620) extending towards the sliding beam (250) is provided on the inner side wall of the slot (610). A second motor (240) for driving the pulley (620) to rotate is provided on the outer side wall of the sliding seat (230).

6. A gantry baffle trolley according to claim 2, characterized in that: The base (320) has a limiting block (140) with a triangular cross-section at both ends. A chain (330) is provided between the limiting block (140) and the base (320). The chain (330) is used to connect the limiting block (140) and the base (320).

7. A gantry baffle trolley according to claim 2, characterized in that: The main beam (260) has connecting plates (210) on both sides for connecting the main beam (260) and the support foot (310).

8. A rapid construction method for cast-in-place retaining walls of railway bridges, implemented by a gantry retaining wall trolley as described in any one of claims 1-7, comprising the following steps: S1. Reinforcing bar installation: First, the reinforcing bars are transported to the bridge. Then, the construction workers install the reinforcing bar cage on both sides of the bridge. First, the vertical main bars are tied and welded to the reinforcing bars that were previously embedded in the bridge. Then, the horizontal distribution bars are passed through and the distribution bars are connected to the main bars with binding wire. S2. Install the template. After the steel reinforcement cage is installed, the construction workers drive the gantry trolley into the bridge deck through the first drive device. Then, the construction workers enter the lifting platform (110) at both ends of the crossbeam (200). The lifting platform (110) is lowered to the outside of the steel reinforcement cage through the second drive device. Then, the construction workers on the bridge deck and the construction workers in the lifting platform (110) work together to fix the template on both sides of the steel reinforcement cage. Then, the construction workers set up templates at intervals along the length of the bridge. The adjacent templates are bolted together. The first drive device drives the gantry trolley to move along the length of the bridge until all templates are installed. S3, pouring and vibrating: After the formwork is installed, pour concrete into the formwork. While pouring concrete, the first drive device drives the gantry trolley to move. Construction workers stand on the lifting platform (110) to vibrate the concrete in the formwork. S4. Demolding: After the concrete has solidified, the construction personnel start the first drive device to drive the gantry trolley to move on the bridge surface. The construction personnel on the bridge surface and the construction personnel in the lifting platform (110) work together to remove the formwork.

9. A rapid construction method for cast-in-place retaining walls of railway bridges according to claim 8, characterized in that: Before installing the steel reinforcement frame, the bridge surface needs to be roughened. Construction workers remove any protrusions or concrete residue from the bridge surface and then wash it with a high-pressure water gun.

10. A rapid construction method for cast-in-place retaining walls of railway bridges according to claim 8, characterized in that: Apply a release agent to the contact surface between the formwork and the concrete before installation.

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