Segmented dismantling construction method and device for cast-in-place prestressed box girder

Abstract

The invention provides a segmented dismantling construction method and device for a cast-in-place prestressed box girder. The device comprises a movable supporting mechanism, a lifting assembly and a temporary consolidation assembly. The movable supporting mechanism comprises a module vehicle, a supporting base, two lifting supporting assemblies and a bearing table fixed to the tops of the two lifting supporting assemblies. The supporting seat is fixed on the module vehicle; the two lifting supporting assemblies are distributed on the supporting base side by side and can drive the bearing table to move up and down relative to a to-be-cut beam section. The bearing table abuts against the bottom of the to-be-cut beam section, and a water collecting assembly used for collecting cutting muddy water is detachably arranged on the outer side wall of the bearing table. The overall stability of the box girder in the construction process can be guaranteed, construction safety is guaranteed, cutting mud water can be prevented from polluting a construction site and peripheral equipment, and the construction site is neater and more orderly.

Description

Technical Field

[0001] The invention relates to the technical field of bridge demolition, and in particular to a segmented demolition construction method and device for cast-in-place prestressed box girders. Background Art

[0002] With the continuous development of urban construction and the adjustment of traffic planning, some of the early cast-in-place prestressed box girders need to be demolished and rebuilt for various reasons. The traditional methods of dismantling cast-in-place prestressed box girders mainly include mechanical crushing and demolition, blasting demolition, cutting, decomposition and hoisting demolition. Mechanical crushing and demolition, such as pneumatic crushing and large-scale mechanical crushing, require less technical investment, but there are problems such as high construction noise and serious dust pollution. In addition, it is difficult to accurately control the demolition scope and intensity during the demolition process, which may cause unnecessary damage to adjacent structures. Although blasting demolition is more efficient, it has greater safety risks and is easy to affect the surrounding environment and buildings. In some densely populated areas or places with high requirements for the surrounding environment, blasting demolition is subject to many restrictions. Compared with mechanical crushing and blasting demolition methods, cutting, decomposition and hoisting demolition will not produce dangerous factors such as explosion shock waves and flying rocks, and the threat to the safety of surrounding buildings and personnel is extremely small. In addition, the demolition noise is small, the air pollution is small, and there is no damage to the retained structure. However, the existing cutting, decomposition and hoisting demolition methods still have the following defects:

[0003] In terms of construction safety, due to the lack of effective support and stable structure, the demolition work only relied on simple temporary support, which could not ensure the overall stability of the box girder during the demolition process. When cutting the beam section, due to the lack of a reliable support system, the beam section was prone to displacement, collapse and other dangerous situations, which led to safety accidents. Summary of the invention

[0004] The purpose of the present invention is to provide a construction method and device for the segmented dismantling of cast-in-place prestressed box girders, which not only effectively solves the technical problem that the existing disassembly and lifting dismantling methods are prone to cause safety accidents due to the lack of effective support and stable structure, but also solves the technical problem that the cutting mud and water generated during the dismantling process are prone to pollute the construction environment.

[0005] To solve the above technical problems, in the first aspect, the present invention provides a construction device for segmented dismantling of cast-in-place prestressed box girders, comprising a movable support mechanism abutting the bottom of the beam section to be cut, a lifting assembly for lifting the beam section to be cut and a temporary consolidation assembly for enhancing the stability of the connection between the box girder and the pier; the movable support mechanism comprises a module vehicle, a support seat, two groups of lifting support assemblies and a receiving platform fixed to the top of the two groups of lifting support assemblies; the support seat is fixed on the module vehicle; the two groups of lifting support assemblies are distributed in parallel on the support seat, and the two groups of lifting support assemblies can drive the receiving platform to move up and down relative to the beam section to be cut; the receiving platform abuts the bottom of the beam section to be cut, and a water collecting assembly for collecting cutting mud and water is detachably provided on the outer wall of the receiving platform.

[0006] Preferably, the receiving platform includes a platform body, a threaded rod, a first drive motor and two clamping plates; a slide groove is provided on the top of the platform body, and the slide groove is arranged along the length direction of the platform body; the threaded rod is rotatably connected in the slide groove; the first drive motor is fixed on the side wall of the platform body, and the output end of the first drive motor is connected to the threaded rod; the two clamping plates are respectively located at both ends of the slide groove, and the two clamping plates can move closer to or away from each other relative to the slide groove; one end of the clamping plate is located in the slide groove and is threadedly connected to the threaded rod, and the other end extends upward to the outside of the slide groove.

[0007] Preferably, the water collection assembly includes a water collection tank and a water tank frame for fixing the water collection tank; a drain pipe is connected to the bottom of the water collection tank; a plurality of connecting grooves are arranged on the side wall of the water tank frame, and a connecting block corresponding to the connecting grooves is arranged on the receiving platform; the water tank frame is connected to the connecting block through the connecting grooves.

[0008] Preferably, a control console is provided on the module vehicle, a pressure sensor is provided on the upper end of the platform body, and the pressure sensor and the first drive motor are respectively connected to the control console for communication.

[0009] Preferably, the lifting support assembly includes a lifting rod and a second drive motor for driving the lifting rod to extend and retract, and the second drive motor is communicatively connected to the control console.

[0010] Preferably, at least one connecting rod is connected between the shells of any two lifting rods.

[0011] Preferably, an oblique support rod is connected between the shell of the lifting rod and the support seat.

[0012] Preferably, it is characterized in that the temporary consolidation assembly includes four cross bars, a plurality of longitudinal tie rods and locking pieces corresponding to the number of the longitudinal tie rods; the four cross bars are enclosed on the outer peripheral side walls of the pier abutment; the plurality of longitudinal tie rods are divided into two groups, the two groups of longitudinal tie rods are respectively fixedly connected to the cross bars located on the left and right sides of the pier, and each longitudinal tie rod extends upward from one end away from the cross bar, and passes through the box girder bridge deck to be connected with the locking piece.

[0013] Preferably, the lifting assembly is a bridge crane, and the lifting assembly includes a base, a main support frame, a cross beam, a hoist, a front support frame and a rear diagonal frame; the base is installed on the bridge deck of the box girder; the lower end of the main support frame is connected to one end of the base, and the upper end of the main support frame is connected to one end of the cross beam; the end of the cross beam away from the main support frame extends to one side in the direction of the extension line of the base; the hoist is installed at the end of the cross beam away from the main support frame; one end of the front support frame is connected to the end of the cross beam away from the main support frame, and the other end extends obliquely downward toward one side of the main support frame until it is connected to the base; one end of the rear diagonal frame is connected to the end of the base away from the main support frame, and the other end extends obliquely upward toward one side of the main support frame until it is connected to the cross beam.

[0014] In a second aspect, the present invention provides a segmented dismantling construction method for a cast-in-place prestressed box girder, which is applied to the segmented dismantling construction device for a cast-in-place prestressed box girder as described in the first aspect, and comprises the following steps:

[0015] Temporary reinforcement of box girders and piers using temporary consolidation components;

[0016] Taking the pier column section of the box girder as the center, divide the box girder from the pier column section to the closing section into N sections to be cut, and cut and remove the box girder body in sequence from the closing section to the pier column sections on both sides;

[0017] Use the module vehicle to move the lifting support assembly to the bottom of the box beam, install the water collection assembly on the receiving platform, raise the height of the lifting support assembly, drive the receiving platform and the water collection assembly to move upward until the receiving platform abuts against the bottom of the beam section to be cut, and align the water collection groove of the water collection assembly with the cutting position of the beam section to be cut;

[0018] Connect the lifting device of the lifting assembly to the beam section to be cut, and after the cutting equipment cuts off the beam section to be cut, lift the cut beam section by the lifting assembly, and after lowering the height of the lifting support assembly, lower the cut beam section to the receiving platform, and fix the cut beam section by the clamping plate of the receiving platform;

[0019] Use a modular vehicle to transport the cut beam segments on the receiving platform to the designated location for crushing and removal.

[0020] Compared with the prior art, the technical solution provided by the present invention has the following advantages:

[0021] (1) The segmented dismantling construction device for cast-in-place prestressed box girders provided by the present invention is provided with a movable support mechanism, a lifting assembly and a temporary consolidation assembly, and the movable support mechanism is provided with a module vehicle, a support seat, two sets of lifting support assemblies and a receiving platform, and a water collecting assembly is provided on the outer wall of the receiving platform. Through the coordinated use of the above-mentioned components, not only can the overall stability of the box girder be ensured during the construction process and the construction safety be guaranteed, but also the cutting mud and water can be avoided from polluting the construction site and surrounding equipment, making the construction site more tidy and orderly.

[0022] (2) The segmented dismantling construction device for cast-in-place prestressed box girders provided by the present invention has a receiving platform provided with a platform body, a threaded rod, a first drive motor and two clamping plates. Through the coordinated use of the above components, the cut beam segments can be clamped, effectively preventing the cut beam segments from shifting or shaking on the receiving platform, ensuring that the module vehicle can smoothly transfer the cut beam segments to the designated location, and further ensuring construction safety.

[0023] (3) The segmented dismantling construction device for cast-in-place prestressed box girders provided by the present invention has a water collection trough and a trough frame, and the bottom of the water collection trough is connected to a drain pipe, the trough frame is provided with a connecting groove, and the receiving platform is provided with a connecting block. Through the coordinated use of the above components, not only can the water collection trough be conveniently installed on one side of the receiving platform to collect cutting mud and water, but also the cutting mud and water collected by the water collection trough can be discharged into the mud and water collection pool on the ground through the drain pipe, so as to uniformly treat the cutting mud and water. At the same time, since the water collection component is buckled and connected to the connecting block through the connecting groove, it can facilitate the disassembly, assembly, cleaning and maintenance of the water collection trough.

[0024] (4) The segmented dismantling construction device for cast-in-place prestressed box girders provided by the present invention is provided with a connecting rod for connecting two sets of lifting support assemblies into a whole, thereby improving the overall stability of the movable support mechanism, so that the movable support mechanism is more stable when supporting the beam section to be cut.

[0025] (5) The segmented dismantling construction device for cast-in-place prestressed box girders provided by the present invention is provided with four cross bars, a plurality of longitudinal tie rods and locking members corresponding to the number of the longitudinal tie rods. Through the coordinated use of the above-mentioned components, during the segmented dismantling construction of cast-in-place prestressed box girders, the box girders can be effectively prevented from being displaced or deformed due to local dismantling operations, thereby ensuring the stability of the overall structure during the construction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the prior art and the embodiments of the present application, the drawings required for use in the description of the prior art and the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 The present invention is a schematic diagram of the structure of the use state of the segmented dismantling construction device for cast-in-place prestressed box girders.

[0028] Figure 2 The present invention is a schematic structural diagram of a clamping plate clamping a cut beam segment in a segmented dismantling construction device for cast-in-place prestressed box beams.

[0029] Figure 3 The present invention is a schematic structural diagram of a movable support mechanism in a segmented dismantling construction device for cast-in-place prestressed box girders.

[0030] Figure 4 for Figure 3 A schematic diagram of the enlarged structure at point A in the middle.

[0031] Figure 5 The present invention is a schematic structural diagram of the use status of the temporary consolidation component in the segmented dismantling construction device for cast-in-place prestressed box girders.

[0032] Figure 6 The present invention is a schematic structural diagram of a lifting assembly in a construction device for segmented dismantling of a cast-in-place prestressed box girder.

[0033] Figure 7 The present invention is a schematic structural diagram of a water collection assembly in a segmented dismantling construction device for cast-in-place prestressed box girders.

[0034] Figure 8 The present invention is a schematic structural diagram of a lifting support assembly in a construction device for segmented dismantling of a cast-in-place prestressed box girder.

[0035] Description of the accompanying drawings: movable support mechanism 100, module vehicle 110, control console 111, support seat 120, lifting support assembly 130, lifting rod 131, second drive motor 132, connecting rod 133, inclined support rod 134, receiving platform 140, platform body 141, slide groove 141A, threaded rod 142, first drive motor 143, clamping plate 144, connecting block 145, pressure sensor 146, lifting assembly 200, base 210, main support frame 220, cross beam 230, hanger 240, front support frame 250, rear diagonal support frame 260, temporary consolidation assembly 300, cross bar 310, longitudinal pull rod 320, locking piece 330, water collection assembly 400, water collection trough 410, trough frame 420, connecting trough 421, drain pipe 430, beam section to be cut 500, cut beam section 600, pier 700, mud and water collection pool 800. DETAILED DESCRIPTION

[0036] In order to better understand the purpose, structure and function of the present invention, the segmented dismantling construction method and device for cast-in-place prestressed box girders provided by the present invention are further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.

[0037] First, see Figures 1 to 8 As shown, the present invention provides a segmented dismantling construction device for cast-in-place prestressed box girders, comprising a movable support mechanism 100 abutting against the bottom of a beam section 500 to be cut, a lifting assembly 200 for lifting the beam section 500 to be cut, and a temporary consolidation assembly 300 for enhancing the connection stability between the box girder and the pier 700; the movable support mechanism 100 comprises a module vehicle 110, a support seat 120, two sets of lifting support assemblies 130, and a receiving platform 140 fixed to the top of the two sets of lifting support assemblies 130; the support seat 120 is fixed on the module vehicle 110; the two sets of lifting support assemblies 130 are distributed in parallel on the support seat 120, and the two sets of lifting support assemblies 130 can drive the receiving platform 140 to move up and down relative to the beam section 500 to be cut; the receiving platform 140 abuts against the bottom of the beam section 500 to be cut, and a water collecting assembly 400 for collecting cutting mud and water is detachably provided on the outer wall of the receiving platform 140. The lifting support assembly 130 includes a lifting rod 131 and a second driving motor 132 for driving the lifting rod 131 to extend and retract.

[0038] Since a movable support mechanism 100, a lifting assembly 200 and a temporary consolidation assembly 300 are provided, and the movable support mechanism 100 is provided with a module vehicle 110, a support seat 120, two sets of lifting support assemblies 130 and a receiving platform 140, and a water collecting assembly 400 is provided on the outer wall of the receiving platform 140, through the coordinated use of the above-mentioned components, not only the overall stability of the box girder during the construction process can be ensured and the construction safety can be guaranteed, but also the cutting mud and water can be avoided from polluting the construction site and surrounding equipment, making the construction site more tidy and orderly.

[0039] Specifically, by setting up a movable support mechanism 100, it is not only used to provide a stable bottom support for the beam section 500 to be cut, but also can effectively disperse the weight of the beam section, enhance the local stability of the beam section 500 to be cut during demolition, and prevent the beam section from collapsing due to the loss of original support during the box beam demolition process, thereby ensuring construction safety. It is also used to quickly transport the cut beam section 600 to a designated location for crushing and transportation, which can effectively improve construction efficiency and reduce construction costs. Furthermore, by setting up a modular vehicle 110 for flexibly and quickly moving the lifting support assembly 130 to the bottom of the box beam, the deployment efficiency of the construction device is greatly improved, saving the pre-construction preparation time, allowing construction personnel to quickly carry out subsequent demolition work, and can quickly transport the cut beam section to a designated location after cutting the beam section, thereby improving transportation efficiency. By setting the lifting support assembly 130, it can not only be adjusted according to the actual height of the beam section 500 to be cut, ensuring that the receiving platform 140 is closely abutted against the bottom of the beam section 500 to be cut, so as to provide a stable bottom support for the beam section 500 to be cut, so that the movable support mechanism 100 can adapt to the removal construction of cast-in-place prestressed box beams of different heights and different working conditions, and has a wide range of applicability, reducing the construction difficulty and risk caused by differences in construction conditions, but also can cooperate with the lifting assembly 200 to ensure that the removed beam section can be smoothly lowered, while improving construction efficiency and ensuring construction safety. By setting the temporary consolidation assembly 300, it is used to enhance the connection stability between the box beam and the pier 700, so as to prevent the overall structure of the box beam from being excessively displaced or deformed due to partial removal when removing the beam section 500 to maintain the stability of the overall structure, and further ensure construction safety. At the same time, since a large amount of muddy water will be generated during the removal and cutting process of the cast-in-place prestressed box beam, if it is not collected in time, the muddy water will flow everywhere, which will not only pollute the construction site, but also may cause damage to the surrounding environment and construction equipment. By arranging a water collecting assembly 400 corresponding to the cutting seam on the outer wall of the receiving platform 140, muddy water generated during the cutting process can be collected, making the construction site more tidy and orderly.

[0040] In a preferred embodiment, the receiving platform 140 includes a platform body 141, a threaded rod 142, a first drive motor 143 and two clamping plates 144; a slide groove 141A is provided on the top of the platform body 141, and the slide groove 141A is arranged along the length direction of the platform body 141; the threaded rod 142 is rotatably connected in the slide groove 141A; the first drive motor 143 is fixed on the side wall of the platform body 141, and the output end of the first drive motor 143 is connected to the threaded rod 142; the two clamping plates 144 are respectively located at both ends of the slide groove 141A, and the two clamping plates 144 can move closer to or away from each other relative to the slide groove 141A; one end of the clamping plate 144 is located in the slide groove 141A and is threadedly connected to the threaded rod 142, and the other end extends upward to the outside of the slide groove 141A.

[0041] Since the receiving platform 140 is provided with a platform body 141, a threaded rod 142, a first drive motor 143 and two clamping plates 144, the above components can be used in coordination to clamp the cut beam section 600, effectively preventing the cut beam section 600 from shifting or shaking on the receiving platform 140, ensuring that the module vehicle 110 can smoothly transport the cut beam section 600 to the designated location, and further ensuring construction safety. Specifically, after the cut beam section 600 is lowered onto the receiving platform 140, the threaded rod 142 is driven to rotate by the first drive motor 143, so that the two clamping plates 144 are respectively moved toward the center of the slide groove 141A, even if the two clamping plates 144 move closer to each other in the slide groove 141A, thereby clamping from both sides of the cut beam section 600, thereby ensuring that the cut beam section 600 will not shift or shake on the receiving platform 140.

[0042] In a preferred embodiment, the water collection assembly 400 includes a water collection tank 410 and a water tank frame 420 for fixing the water collection tank 410; a drain pipe 430 is connected to the bottom of the water collection tank 410; a plurality of connecting grooves 421 are provided on the side wall of the water tank frame 420, and the receiving platform 140 is provided with a connecting block 145 corresponding to the connecting groove 421; the water tank frame 420 is connected to the connecting block 145 through the connecting groove 421.

[0043] Since the water collection component 400 is provided with a water collection tank 410 and a water tank frame 420, and a drain pipe 430 is connected to the bottom of the water collection tank 410, the water tank frame 420 is provided with a connecting groove 421, and the receiving platform 140 is provided with a connecting block 145, through the coordinated use of the above components, not only can the water collection tank 410 be conveniently installed on one side of the receiving platform 140 to collect cutting muddy water, but also the cutting muddy water collected by the water collection tank 410 can be discharged into the muddy water collection pool 800 on the ground through the drain pipe 430, so as to uniformly treat the cutting muddy water. At the same time, since the water collection component 400 is buckled and connected to the connecting block 145 through the connecting groove 421, it is convenient to disassemble, clean and maintain the water collection tank 410. Specifically, since muddy water will be generated during the cutting construction process, in order to avoid the pollution of the construction site by the cutting muddy water during the cutting process, a water collecting trough 410 is installed on the outer wall of the receiving platform 140 at the cutting line position relative to the bottom of the box beam, and the cutting muddy water is guided to the muddy water collection pool 800 on the ground through the drainage pipe 430 connected to the bottom of the water collecting trough 410, and discharged after sedimentation. Among them, the water collecting trough 410 is made of soft material (such as canvas), which can not only be folded up when not in use, so that the space occupied by the water collecting trough 410 is greatly reduced, which is convenient for storage and storage at the construction site, but also the water collecting trough 410 has low manufacturing process requirements, relatively simple processing, and low cost. It can reduce the material cost of the construction device under the premise of ensuring the water collecting function, especially in the case of large-scale construction or frequent replacement of the water collecting trough 410, the lower material cost can significantly save construction costs.

[0044] In a preferred embodiment, a control console 111 is provided on the module vehicle 110 , a pressure sensor 146 is provided on the upper end of the table body 141 , and the pressure sensor 146 , the first drive motor 143 , and the second drive motor 132 are respectively connected to the control console 111 for communication.

[0045] By setting the control console 111 and the pressure sensor 146, the pressure sensor 146 is used to monitor the pressure of the beam section 500 to be cut on the receiving platform 140 in real time. During the demolition construction process, the weight distribution of the beam section 500 to be cut may change due to factors such as cutting operations. The pressure data is transmitted to the control console 111 in real time through the pressure sensor 146, and the extension and contraction of the lifting support assembly 130 is controlled by the control console 111 to keep the beam section 500 to be cut balanced. At the same time, the construction personnel can timely understand the status of the beam section 500 to be cut. If the pressure changes abnormally, such as a sudden increase or decrease in pressure, it may indicate that the position of the beam section 500 to be cut has shifted or there is a problem with the movable support mechanism 100. At this time, the control console 111 can issue an alarm to remind the construction personnel to take measures to effectively avoid the occurrence of safety accidents.

[0046] In a preferred embodiment, at least one connecting rod 133 is connected between the shells of any two lifting rods 131. The connecting rod 133 is provided to connect the two lifting support assemblies 130 into a whole, thereby improving the overall stability of the movable support mechanism 100, so that the movable support mechanism 100 is more stable when supporting the beam segment 500 to be cut. In the embodiment of the present application, two connecting rods 133 are connected between the shells of any two lifting rods 131.

[0047] In a preferred embodiment, an oblique support rod 134 is further connected between the housing of the lifting rod 131 and the support seat 120. Due to the provision of the oblique support rod 134, the connection stability between the lifting rod 131 and the support seat 120 can be improved, and the overall stability of the movable support mechanism 100 can be further improved.

[0048] In a preferred embodiment, the temporary consolidation assembly 300 includes four cross bars 310, a plurality of longitudinal tie rods 320 and locking members 330 corresponding to the number of the longitudinal tie rods 320; the four cross bars 310 are enclosed on the outer peripheral side wall of the pier abutment of the pier 700; the plurality of longitudinal tie rods 320 are divided into two groups, and the two groups of longitudinal tie rods 320 are respectively fixedly connected to the cross bars 310 located on the left and right sides of the pier 700, and each longitudinal tie rod 320 extends upward from one end away from the cross bar 310, and passes through the box girder bridge deck and is connected to the locking member 330.

[0049] Since four cross bars 310, a plurality of longitudinal tie rods 320 and locking members 330 matching the number of longitudinal tie rods 320 are provided, the above-mentioned components can be used in coordination with each other, so that in the construction of the segmented removal of the cast-in-place prestressed box girder, the displacement and deformation of the box girder due to the local removal operation can be effectively prevented, and the stability of the overall structure during the construction process can be guaranteed. Specifically, by setting four cross bars 310 to enclose the outer peripheral side wall of the pier 700, a stable frame structure is formed to constrain the pier 700 from all sides. By dividing a plurality of longitudinal tie rods 320 into two groups, the two groups of longitudinal tie rods 320 are respectively fixedly connected to the cross bars 310 located on the left and right sides of the pier 700, and the end of the longitudinal tie rod 320 away from the cross bar 310 upwardly penetrates the box girder bridge deck and is connected by the locking member 330 (such as a nut), so that the box girder and the pier 700 are tightly pulled together, which greatly enhances the connection stability between the box girder and the pier 700. In the embodiment of the present application, three longitudinal tie rods 320 are respectively arranged on the left and right sides of the pier 700, and pads are arranged at the through holes of the bridge deck. The crossbars are provided with connecting pieces and are threadedly connected to the longitudinal tie rods 320 through the connecting pieces.

[0050] In a preferred embodiment, the lifting assembly 200 is a bridge crane or a car crane. In the embodiment of the present application, the lifting assembly 200 is a bridge crane, and the lifting assembly 200 includes a base 210, a main support frame 220, a beam 230, a sling 240, a front support frame 250 and a rear inclined frame 260; the base 210 is installed on the bridge deck of the box beam; the lower end of the main support frame 220 is connected to one end of the base 210, and the upper end of the main support frame 220 is connected to one end of the beam 230; the beam 230 is away from the main support frame One end of the frame 220 extends to one side in the direction of the extension line of the base 210; the hanger 240 is installed on the end of the crossbeam 230 away from the main support frame 220; one end of the front support frame 250 is connected to the end of the crossbeam 230 away from the main support frame 220, and the other end extends obliquely downward to the side of the main support frame 220 to connect with the base 210; one end of the rear diagonal support frame 260 is connected to the end of the base 210 away from the main support frame 220, and the other end extends obliquely upward to the side of the main support frame 220 to connect with the crossbeam 230. Among them, the main support frame 220, the front support frame 250 and the rear diagonal support frame 260 are all isosceles triangle structures, which can not only ensure the overall stability of the lifting assembly, but also have a simple structure, easy to disassemble and assemble, and can effectively improve the construction efficiency.

[0051] In a second aspect, an embodiment of the present application provides a segmented dismantling construction method for a cast-in-place prestressed box girder, which is applied to the segmented dismantling construction device for a cast-in-place prestressed box girder described in the first aspect, comprising the following steps:

[0052] Step S1: temporarily reinforce the box girder and the pier 700 using the temporary consolidation assembly 300.

[0053] Specifically, four cross bars 310 are enclosed on the outer peripheral side wall of the pier 700 to form a stable frame structure, and the same number of longitudinal tie rods 320 are set on the left and right sides of the pier 700 and connected to the cross bars 310 to achieve temporary reinforcement of the box girder and the pier 700, so as to enhance the connection stability between the box girder and the pier 700, ensure the stability of the overall structure during the construction process, and prevent the box girder from being displaced and deformed due to partial demolition operations. Further, the longitudinal tie rods 320 are passed through the pre-opened through holes on the bridge deck of the box girder to the bottom of the box girder and connected and fixed with the connecting pieces on the cross bars 310, a pad is put on the through hole on the bridge deck, and the end of the longitudinal tie rods 320 on the bridge deck is locked and fixed with fasteners (such as nuts).

[0054] Step S2, taking the pier 700 section of the box girder as the center, dividing the box girder from the pier 700 section to the closing section into N sections of beams to be cut 500, and cutting and removing the box girder body in sequence from the closing section to the pier 700 sections on both sides.

[0055] The purpose of this step is to make full use of the stable supporting function of the pier 700 to ensure the stability of the overall structure of the box girder during the demolition process. An orderly demolition sequence is convenient for construction personnel to operate, reduce uncertainty during the construction process, and improve construction efficiency. At the same time, it helps to evenly disperse the stress generated during the demolition process, avoid damage or collapse of the box girder structure due to local stress concentration, and ensure construction safety.

[0056] Step S3, use the module vehicle 110 to move the lifting support assembly 130 to the bottom of the box beam, install the water collection assembly 400 on the receiving platform 140, increase the height of the lifting support assembly 130, drive the receiving platform 140 and the water collection assembly 400 to move upward until the receiving platform 140 abuts against the bottom of the beam section 500 to be cut, and align the notch of the water collection trough 410 of the water collection assembly 400 with the cutting position of the beam section 500 to be cut.

[0057] Specifically, the module vehicle 110 is used to move the lifting support assembly 130 to the bottom of the box beam, and the second drive motor 132 of the control console 111 is used to increase the height of the lifting rod 131, so that the receiving platform 140 and the water collection assembly 400 are moved upward until the platform body 141 abuts against the bottom of the beam section 500 to be cut, and the notch of the water collection trough 410 is aligned with the cutting position of the beam section 500 to be cut. At the same time, the control console 111 controls the second drive motor 132 to adjust the extension and retraction of the lifting rod 131 according to the pressure information transmitted in real time by the pressure sensor 146 to keep the balance of the beam section 500 to be cut.

[0058] Step S4, connect the sling 240 of the lifting assembly to the beam section 500 to be cut, and after the cutting equipment cuts off the beam section 500 to be cut, lift the cut beam section 600 through the lifting assembly, and after lowering the height of the lifting support assembly 130, lower the cut beam section 600 to the receiving platform 140, and use the clamping plate 144 of the receiving platform 140 to fix the cut beam section 600.

[0059] Specifically, a lifting component, such as a bridge crane, is installed on the bridge deck of the N-1th section of the beam segment 500 to be cut, and the lifting device 240 of the lifting component is accurately docked with the pre-set connection points on the beam segment 500 to be cut and firmly connected. During the connection process, strictly follow the operating procedures, repeatedly check the stability of the connection, and avoid dangerous situations such as loosening and falling off during the subsequent lifting process. After the cutting equipment is in place, start the cutting equipment, and cut the beam segment 500 to be cut steadily and slowly according to the predetermined cutting route. When the cutting equipment completely cuts off the beam segment 500 to be cut, slowly lift the lifting device 240 so that the lifting device 240 is gradually stressed and the cut beam segment 600 is lifted steadily. During the lifting process, always pay attention to the operating status of the lifting component and the lifting posture of the cut beam segment 600 to ensure a safe and stable lifting process. After the cut beam segment 600 is lifted to a certain height, the height of the lifting rod 131 is lowered, and after the receiving platform 140 is lowered to the lowest height of the lifting rod 131, the sling 240 of the lifting assembly 200 is controlled to slowly lower the cut beam segment 600 to the receiving platform 140. During the lowering process, the cut beam segment 600 is kept horizontal to prevent the cut beam segment 600 from tilting or shaking. At the same time, pay close attention to the safe distance between the cut beam segment 600 and the surrounding structure to avoid collision. After the cut beam segment 600 is lowered to the receiving platform 140, start the first drive motor 143 to rotate the threaded rod 142, driving the two clamping plates 144 to approach each other. When the clamping plate 144 approaches the cut beam segment 600, observe the position of the beam segment in real time to ensure that the cut beam segment 600 is located at the center of the two clamping plates 144. When the clamping plate 144 is in close contact with the beam section, the clamping plate 144 applies a suitable clamping force to the beam section to firmly fix the cut beam section 600 on the receiving platform 140 to prevent the cut beam section 600 from being displaced during the subsequent transportation of the module vehicle 110.

[0060] Step S5: Use the module vehicle 110 to transport the cut beam segments 600 on the receiving platform 140 to a designated location for crushing and removal.

[0061] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A construction device for dismantling cast-in-place prestressed box girders in sections, characterized in that: The invention relates to a box beam structure (500) for cutting a box beam, and a box beam structure (500) for cutting a box beam. The box beam structure (500) comprises a movable support mechanism (100) abutting against the bottom of a beam segment (500) to be cut, a lifting assembly (200) for lifting the beam segment (500) to be cut, and a temporary consolidation assembly (300) for enhancing the connection stability between the box beam and the pier (700); the movable support mechanism (100) comprises a module vehicle (110), a support seat (120), two sets of lifting support assemblies (130), and a receiving platform (140) fixed to the top of the two sets of lifting support assemblies (130); the support assembly (100) comprises a module vehicle (110), a support seat (120), two sets of lifting support assemblies (130), and a receiving platform (140) fixed to the top of the two sets of lifting support assemblies (130); the lifting assembly (200) is used to lift the box beam segment (500) and the temporary consolidation assembly (300) is used to enhance the connection stability between the box beam and the pier (700). The support seat (120) is fixed on the module vehicle (110); two groups of the lifting support components (130) are distributed in parallel on the support seat (120), and the two groups of the lifting support components (130) can drive the receiving platform (140) to move up and down relative to the beam section (500) to be cut; the receiving platform (140) is in contact with the bottom of the beam section (500) to be cut, and a water collection component (400) for collecting cutting mud and water is detachably provided on the outer wall of the receiving platform (140).

2. The segmented dismantling construction device for cast-in-place prestressed box beams according to claim 1 is characterized in that: The receiving platform (140) comprises a platform body (141), a threaded rod (142), a first driving motor (143) and two clamping plates (144); a slide groove (141A) is provided on the top of the platform body (141), and the slide groove (141A) is arranged along the length direction of the platform body (141); the threaded rod (142) is rotatably connected in the slide groove (141A); the first driving motor (143) is fixed on the side wall of the platform body (141) , and the output end of the first driving motor (143) is connected to the threaded rod (142); the two clamping plates (144) are respectively located at the two ends of the slide groove (141A), and the two clamping plates (144) can move closer to or away from each other relative to the slide groove (141A); one end of the clamping plate (144) is located in the slide groove (141A) and is threadedly connected to the threaded rod (142), and the other end extends upward to the outside of the slide groove (141A).

3. The segmented dismantling construction device for cast-in-place prestressed box beams according to claim 1 is characterized in that: The water collection assembly (400) comprises a water collection tank (410) and a water tank frame (420) for fixing the water collection tank (410); the bottom of the water collection tank (410) is connected to a drain pipe (430); a plurality of connecting grooves (421) are provided on the side wall of the water tank frame (420); the receiving platform (140) is provided with connecting blocks (145) corresponding to the connecting grooves (421); and the water tank frame (420) is connected to the connecting block (145) via the connecting grooves (421).

4. The segmented dismantling construction device for cast-in-place prestressed box beams according to claim 2 is characterized in that: The module vehicle (110) is provided with a control console (111), and the upper end of the platform body (141) is provided with a pressure sensor (146), and the pressure sensor (146) and the first drive motor (143) are respectively connected to the control console (111) for communication.

5. The segmented dismantling construction device for cast-in-place prestressed box beams according to claim 4 is characterized in that: The lifting support assembly (130) comprises a lifting rod (131) and a second driving motor (132) for driving the lifting rod (131) to extend and retract, and the second driving motor (132) is communicatively connected to the control console (111).

6. The segmented dismantling construction device for cast-in-place prestressed box beams according to claim 5, characterized in that: At least one connecting rod (133) is connected between the shells of any two lifting rods (131).

7. The segmented dismantling construction device for cast-in-place prestressed box beams according to claim 6 is characterized in that: An oblique support rod (134) is also connected between the shell of the lifting rod (131) and the support seat (120).

8. The segmented dismantling construction device for cast-in-place prestressed box girders according to any one of claims 1 to 7, characterized in that: The temporary consolidation assembly (300) includes four cross bars (310), a plurality of longitudinal tie rods (320) and locking members (330) corresponding to the number of the longitudinal tie rods (320); the four cross bars (310) are enclosed on the outer peripheral side wall of the pier (700); the plurality of longitudinal tie rods (320) are divided into two groups, and the two groups of longitudinal tie rods (320) are respectively fixedly connected to the cross bars (310) located on the left and right sides of the pier (700), and each of the longitudinal tie rods (320) extends upward from one end of the cross bar (310) and passes through the box girder bridge deck to be connected with the locking member (330).

9. The segmented dismantling construction device for cast-in-place prestressed box beams according to claim 8, characterized in that: The lifting assembly (200) is a bridge crane, and the lifting assembly (200) comprises a base (210), a main support frame (220), a cross beam (230), a sling (240), a front support frame (250) and a rear diagonal frame (260); the base (210) is installed on the bridge deck of the box beam; the lower end of the main support frame (220) is connected to one end of the base (210), and the upper end of the main support frame (220) is connected to one end of the cross beam (230); the end of the cross beam (230) away from the main support frame (220) is extended toward the extension line of the base (210). The sling (240) is installed on one end of the crossbeam (230) away from the main support frame (220); one end of the front support frame (250) is connected to one end of the crossbeam (230) away from the main support frame (220), and the other end extends obliquely downward toward the side of the main support frame (220) to be connected to the base (210); one end of the rear diagonal frame (260) is connected to one end of the base (210) away from the main support frame (220), and the other end extends obliquely upward toward the side of the main support frame (220) to be connected to the crossbeam (230).

10. A construction method for segmented dismantling of a cast-in-place prestressed box girder, applied to a construction device for segmented dismantling of a cast-in-place prestressed box girder as claimed in any one of claims 1 to 9, characterized in that: The steps include: Temporarily reinforcing the box beam and the pier column (700) using a temporary consolidation assembly (300); Taking the pier (700) section of the box beam as the center, the box beam is divided into N sections of beams to be cut (500) from the pier (700) section to the closing section, and the box beam body is cut and removed in sequence from the closing section to the pier (700) sections on both sides; Using a module vehicle (110), the lifting support assembly (130) is moved to the bottom of the box beam, the water collection assembly (400) is installed on the receiving platform (140), the height of the lifting support assembly (130) is raised, and the receiving platform (140) and the water collection assembly (400) are driven to move upward until the receiving platform (140) abuts against the bottom of the beam section (500) to be cut, and the notch of the water collection tank (410) of the water collection assembly (400) is aligned with the cutting position of the beam section (500) to be cut; The lifting device (240) of the lifting assembly is connected to the beam section (500) to be cut, and after the cutting device cuts the beam section (500) to be cut, the cut beam section (600) is lifted by the lifting assembly, and after the height of the lifting support assembly (130) is lowered, the cut beam section (600) is lowered onto the receiving platform (140), and the cut beam section (600) is fixed by the clamping plate (144) of the receiving platform (140); The cut beam segments (600) on the receiving platform (140) are transported to a designated location by using a modular vehicle (110) for crushing and removal.

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