Construction method for bottom-holding channel-sealing-free sliding dismantling of high-speed steel-crossing box girder

Abstract

The invention relates to a crossing high-speed steel box girder bottom-holding channel-sealing-free sliding dismantling construction method which comprises the following steps that a BIM model of a to-be-constructed part is established, and physical characteristics of the BIM model are analyzed; determining sliding vehicle design parameters according to the BIM model, and manufacturing a sliding vehicle according to the design parameters; the sliding trolley is connected with guardrails on the two sides of the steel box girder above the bag bottom and connected with the bag bottom through connecting ropes; the connection between the pocket bottom and the steel box girder is relieved, and the sliding trolley is dragged through traction equipment, so that the pocket bottom slides to one side of the existing passing highway; hoisting equipment is connected with the pocket bottom through a lifting appliance, connection between the sliding trolley and the pocket bottom is removed, and the pocket bottom is hoisted to a designated position through the hoisting equipment. According to the method, the sliding process of the sliding vehicle under different working conditions is simulated through the BIM model, the feasibility, stability and safety of the sliding vehicle walking on the guardrail are accurately evaluated, potential problems are recognized and solved in advance, the construction efficiency and the overall engineering quality are remarkably improved, and it is ensured that dismantling operation is safely and orderly carried out.

Description

Technical Field

[0001] The present application relates to the technical field of bridge construction, and in particular to a sliding demolition construction method for a bottom-covering and road-sealing-free spanning high-speed steel box girder. Background Art

[0002] When the steel box girder of a new expressway is constructed across an existing expressway, bottom protection measures need to be added to the bottom of the steel box girder located above the existing traffic height to ensure the safety of traffic on the expressway below.

[0003] When removing the bottom-line protection measures, the traditional removal method is carried out without closing the road, which has the following defects: 1. Construction workers work at high altitudes in a complex traffic environment, lacking reliable and stable supporting equipment, which poses safety hazards such as bottom falls and personnel falling from high altitudes. At the same time, the impact of demolition work on the bottom of the steel box girder is difficult to control. Once the operation is improper, it may cause the bottom of the steel box girder to fall, causing major safety accidents and traffic construction.

[0004] 2. Traditional demolition equipment is rather cumbersome in disassembly and assembly, requiring a large amount of manpower and material resources, and the construction process is easily disturbed by external factors such as traffic conditions, resulting in slow construction progress and low efficiency. The long construction time further increases the probability of safety accidents. Summary of the invention

[0005] Based on this, it is necessary to provide a sliding demolition construction method for the bottom cover of a high-speed steel box girder without closing the road, so as to overcome the defects of low efficiency and great safety hazards in the existing bottom cover demolition of a high-speed steel box girder.

[0006] The sliding demolition construction method of the bottom-covering and road-sealing-free steel box girder across the high-speed road includes the following steps: Step 1: Establish a BIM model of the area to be constructed and analyze its physical characteristics; Step 2: Determine the design parameters of the sliding car according to the BIM model, and manufacture the sliding car according to the design parameters; Step 3: Connect the sliding car to the guardrails on both sides of the steel box girder above the bottom of the bag, and connect it to the bottom of the bag through a connecting rope; Step 4: Release the connection between the bottom support and the steel box girder, and use the traction equipment to pull the sliding vehicle to slide the bottom support to the side of the existing highway; Step 5: Connect the lifting equipment to the bottom of the basket through the lifting device, release the connection between the sliding car and the bottom of the basket, and lift the bottom of the basket to the designated location through the lifting equipment.

[0007] As a preferred embodiment of the sliding demolition construction method for the bottom-covering and road-sealing-free high-speed steel box girder in the present invention, the step 1 specifically comprises: The geometric and physical parameters of the steel box girder, guardrail and surrounding environment are collected to build a high-precision BIM model. The strength distribution of the steel box girder structure, the bearing capacity and deformation characteristics of the guardrail, and the possible stress concentration points during the demolition process are analyzed.

[0008] As a preferred embodiment of the sliding demolition construction method for the bottom-covering and road-sealing-free high-speed steel box girder in the present invention, the step three specifically includes: Multiple groups of sliding vehicles are arranged at intervals on the guardrail above the bottom of the bag, each group includes two, and are symmetrically installed on the guardrails on both sides, and the sliding vehicles in the same group are connected to each other by steel wire ropes; The middle part of the connecting rope is connected to the middle part of the sliding vehicle of the same group, and the two ends of the connecting rope extend downward to be connected to the two ends of the bottom of the bag.

[0009] As a preferred embodiment of the sliding demolition construction method for the bottom-covering and road-sealing-free cross-high-speed steel box girder in the present invention, the step 4 specifically includes: Starting from one side of the bottom cover, the connection between the bottom cover and the steel box girder is released one by one until the connection between the bottom cover and the steel box girder is completely disconnected. The traction equipment is connected to the sliding car through the traction rope, and moves forward slowly and evenly to pull the bottom cover to the side of the existing highway.

[0010] As a preferred embodiment of the sliding demolition construction method for the bottom-covering and road-sealing-free cross-high-speed steel box girder in the present invention, the step 4 further includes: During each process of releasing a connection point, tighten the corresponding connecting rope. After tightening, ensure that there is no downward force when the original connection point is released, and then fix the connecting rope. During the dismantling process, if there is any abnormality, stop the operation immediately and take reinforcement measures.

[0011] As a preferred embodiment of the sliding removal construction method for the bottom cover of the high-speed steel box girder without road closure described in the present invention, after the connection between the bottom cover and the steel box girder is released, a grinding tool is used to grind the scratches, wear and rust spots on the surface of the steel box girder after the bottom cover is removed, and the edges of the grinding area are kept smooth to avoid the formation of stress concentration points, followed by spray painting repairs.

[0012] As a preferred embodiment of the sliding demolition construction method for the bottom-covering and road-sealing-free construction of a high-speed steel box girder in the present invention, the angle between the traction rope and the guardrail is not greater than 60 degrees.

[0013] As a preferred embodiment of the sliding demolition construction method for the bottom-covering and road-sealing-free cross-high-speed steel box girder in the present invention, the step five specifically includes: The lifting equipment is deployed on one side of the existing highway. After the basket bottom slides to that side, the lifting equipment is connected to the basket bottom through the lifting device. There are no less than four connections between the lifting device and the basket bottom, which are evenly distributed around the center of gravity of the basket bottom. Then the connection between the sliding vehicle and the basket bottom is released, and the basket bottom is lifted to the designated location by the lifting equipment.

[0014] As a preferred embodiment of the sliding demolition construction method for the bottom-covered and road-free high-speed steel box girder described in the present invention, the sliding vehicle includes a load-bearing rod and an auxiliary rod. The top of the load-bearing rod is provided with a limiting groove along its entire length. The auxiliary rod is provided at the end of the load-bearing rod and extends to the same side of the load-bearing rod. Roller assemblies are provided on the inner sides of the load-bearing rod and the auxiliary rod.

[0015] As a preferred embodiment of the sliding dismantling construction method for the cross-high-speed steel box girder without road closure described in the present invention, the roller assembly includes a fixed wheel group and an adjusting wheel group, the fixed wheel group is fixedly connected to the load-bearing rod and one of the auxiliary rods, and the adjusting wheel group is detachably connected to the other auxiliary rod. The present invention simulates the sliding process of the sliding vehicle under different working conditions through the BIM model, accurately evaluates the feasibility, stability and safety of the sliding vehicle when walking on the guardrail, and identifies and solves potential problems in advance. This provides scientific and reliable solution guidance for actual construction, significantly improves construction efficiency and overall project quality, and ensures that demolition operations are carried out safely and orderly.

[0016] The present invention uses guardrails, sliding vehicles, traction equipment and lifting equipment to work together to complete the demolition work when the highway is open to traffic, greatly reducing the interference with the traffic flow on the highway, effectively reducing the risk of traffic congestion caused by construction, and effectively ensuring the smoothness of road transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is a schematic diagram of the construction method in the embodiment of the present application; Figure 2 This is a schematic diagram of the structure when the sliding vehicle is connected to the bottom of the bag in the embodiment of the present application; Figure 3 This is a schematic diagram of the structure of the sliding vehicle in the embodiment of the present application; Description of reference numerals: 1. Load-bearing rod; 2. Auxiliary rod; 3. Fixed wheel set; 31. Connecting piece; 32. Pressure bearing; 33. Connecting pipe; 4. Adjusting wheel set; 41. Screw rod; 42. Rubber wheel; 43. Nut; 5. Limiting groove. DETAILED DESCRIPTION

[0019] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0020] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0022] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0023] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0024] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0025] Example This embodiment provides a sliding demolition construction method for a high-speed steel box girder without road closure to overcome the defects of low efficiency and potential safety hazards in traditional bottom demolition methods. Figure 1 As shown, the following steps are included: Construction preparation: collect on-site construction materials, form a construction team, and prepare construction equipment.

[0026] BIM modeling: Collect on-site information of the construction site to be demolished, establish a high-precision BIM model based on the collected information, and analyze the strength distribution of the steel box girder structure, the bearing capacity and deformation characteristics of the guardrail, and the stress concentration points that may exist during the demolition process.

[0027] The on-site information includes geometric and physical parameters of the steel box girder, the bottom support and the surrounding environment.

[0028] Sliding car manufacturing: According to the established BIM model, the mechanical response of different trolley design schemes under various working conditions is simulated, and the optimal sliding car design parameters are determined according to the simulation results. The design parameters include the overall structure and the materials used in each part of the overall structure. The sliding car is manufactured according to the optimal sliding car design parameters.

[0029] Sliding car installation: two sliding cars are divided into one group, and the two sliding cars in the same group are symmetrically installed on the guardrails on both sides of the steel box beam above the bottom, and multiple groups of sliding cars are arranged at intervals along the axial direction of the guardrail. Figure 2As shown, the middle part of the connecting rope is connected to the middle part of the sliding vehicle of the same group to ensure that the sliding vehicle can drive the connecting rope to move. The two ends of the connecting rope extend downward and connect to the two ends of the bottom of the bag, and then the connecting rope is tightened to ensure safety.

[0030] In this embodiment, in order to prevent the sliding vehicles from tipping over, the sliding vehicles in the same group are connected and pulled against each other by steel wire ropes.

[0031] Release the bottom connection: On the aerial work platform, construction workers use professional tools to remove the lifting points of the bottom and the steel box girder from one side of the bottom in sequence. When the lifting point is not released, the connecting rope is tightened with a hand winch. After tightening, ensure that there is no downward force on the bottom when the lifting point is released, and then clamp the wire rope. During the removal process, pay close attention to the force changes in the connection parts. If there is any abnormality, stop the operation immediately and take reinforcement measures. When the lifting point is a bolted structure, loosen it first but do not remove it completely. After all the bolts are loosened, remove them one by one to prevent structural deformation or component falling off due to sudden changes in local force.

[0032] After the lifting point connection is released, use grinding tools to finely grind the scratches, wear and rust spots on the surface of the steel box girder after the bottom cover is removed. The grinding depth is controlled at 0.2mm~0.5mm to ensure that the damaged coating and rust are removed without damaging the steel box girder structure. The edges of the grinding area should have a smooth transition to prevent the formation of stress concentration points.

[0033] Use high-performance anti-corrosion paint that matches the original paint surface of the steel box girder for spray repair. Before spraying, mix the paint strictly according to the paint product manual to ensure the quality of the paint repair is reliable and effectively protect the steel box girder structure.

[0034] After the bottom scoop and the steel box girder lifting points are completely disconnected, connect the two ends of the traction rope to the same group of sliding vehicles, connect the traction equipment to the middle part of the traction rope, and move the traction equipment forward slowly and evenly to pull the bottom scoop to the side of the existing highway.

[0035] In this embodiment, the angle between the traction rope and the guardrail is no greater than 60 degrees to ensure traction safety.

[0036] Removing the bottom shed: According to the weight and size of the bottom shed, select lifting equipment with appropriate lifting capacity, and deploy the lifting equipment on the side of the existing highway to ensure that the crane's operating radius covers the bottom shed removal position and the outriggers are stable and reliable.

[0037] After the sliding car slides the bottom of the basket into the operating range of the lifting equipment, the lifting equipment is connected to the bottom of the basket through the lifting equipment. There are no less than four connections between the lifting equipment and the bottom of the basket, and they are evenly distributed around the center of gravity of the bottom of the basket to ensure that the bottom of the basket is stable during the lifting process. Then the connection between the sliding car and the bottom of the basket is released, and the bottom of the basket is lifted to the designated position by the lifting equipment.

[0038] like Figure 3As shown, it includes a frame and a roller assembly arranged therein, wherein the frame is used to be connected to the upper part of the guardrail and the wire rope, and the roller assembly is used to enable the frame to slide along the entire length of the guardrail.

[0039] The frame includes a load-bearing rod 1 and auxiliary rods 2 arranged at both ends thereof. The top of the load-bearing rod 1 is provided with a limiting groove 5 for limiting the position of the wire rope to prevent the wire rope from falling off during sliding. One end of a pair of auxiliary rods 2 is respectively fixed to one end of the load-bearing rod 1, and the other ends are both facing the side where the load-bearing rod 1 is connected to the guardrail.

[0040] In this embodiment, the end of the limiting groove 5 is arc-shaped to reduce the wear between the connecting rope and the limiting groove 5 and extend the service life of the connecting rope.

[0041] The roller assembly is arranged on the inner side of the load-bearing rod 1 and the auxiliary rod 2, and includes a fixed wheel group 3 and an adjusting wheel group 4. The fixed wheel group 3 is fixedly connected to the load-bearing rod 1 and one of the auxiliary rods 2, and the adjusting wheel group 4 is detachably connected to the other auxiliary rod 2. When the sliding trolley is installed, the sliding trolley is firmly connected to the guardrail by adjusting the adjusting wheel group 4.

[0042] The fixed wheel assembly 3 includes a connecting member 31, the cross section of which is U-shaped, which is arranged perpendicular to the full length direction of the load-bearing rod 1 or the auxiliary rod 2 and has an open side fixedly connected to the load-bearing rod 1 or the auxiliary rod 2. A plurality of pressure bearings 32 are arranged at intervals at the bottom of the connecting member 31 along its full length direction, and the pressure bearings 32 are rotatably connected to the load-bearing rod 1 and the auxiliary rod 2 through a connecting pipe 33.

[0043] In this embodiment, a connecting hole is provided at the end of the connecting member 31 to facilitate construction workers to move the sliding trolley through traction equipment.

[0044] The adjusting wheel assembly 4 includes a screw rod 41 , wherein a through hole is provided at the end of another auxiliary rod 2 , one end of the screw rod 41 passes through the through hole and is rotatably connected to the rubber wheel 42 , and the other end thereof is detachably connected to the auxiliary rod 2 via a nut 43 .

[0045] During installation, firstly, the sliding car is sleeved on the upper part of the guardrail, so that the fixed wheel set 3 abuts against the top and outer side of the guardrail, and the adjusting wheel set 4 is located inside the guardrail. Then, the adjusting wheel set 4 is adjusted by the nut 43, so that the rubber wheel 42 abuts against the inner side of the guardrail. The spacing and verticality of the pressure bearing 32 are accurately adjusted by the level meter to ensure that the pressure bearing 32 is in the same plane, so that the sliding car can slide smoothly on the steel box girder guardrail, and the installation is completed. When dismantling, the sliding car can be removed by loosening the nut 43.

[0046] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A sliding demolition construction method for a high-speed steel box girder without road closure, characterized in that: The steps include: Step 1: Establish a BIM model of the area to be constructed and analyze its physical characteristics; Step 2: Determine the design parameters of the sliding car according to the BIM model, and manufacture the sliding car according to the design parameters; Step 3: Connect the sliding car to the guardrails on both sides of the steel box girder above the bottom of the bag, and connect it to the bottom of the bag through a connecting rope; Step 4: Release the connection between the bottom support and the steel box girder, and use the traction equipment to pull the sliding vehicle to slide the bottom support to the side of the existing highway; Step 5: Connect the lifting equipment to the bottom of the basket through the lifting device, release the connection between the sliding car and the bottom of the basket, and lift the bottom of the basket to the designated location through the lifting equipment.

2. The sliding demolition construction method for the bottom-covering and road-sealing-free high-speed steel box girder according to claim 1 is characterized in that: The step 1 specifically includes: The geometric and physical parameters of the steel box girder, guardrail and surrounding environment are collected to build a high-precision BIM model. The strength distribution of the steel box girder structure, the bearing capacity and deformation characteristics of the guardrail, and the possible stress concentration points during the demolition process are analyzed.

3. The sliding demolition construction method for the bottom-covering and road-sealing-free high-speed steel box girder according to claim 1 is characterized in that: The step three specifically includes: Multiple groups of sliding vehicles are arranged at intervals on the guardrail above the bottom of the bag, each group includes two, and are symmetrically installed on the guardrails on both sides, and the sliding vehicles in the same group are connected to each other by steel wire ropes; The middle part of the connecting rope is connected to the middle part of the sliding vehicle of the same group, and the two ends of the connecting rope extend downward to be connected to the two ends of the bottom of the bag.

4. The sliding demolition construction method for the bottom-covering and road-sealing-free high-speed steel box girder according to claim 1 is characterized in that: The step 4 specifically includes: Starting from one side of the bottom cover, the connection between the bottom cover and the steel box girder is released one by one until the connection between the bottom cover and the steel box girder is completely disconnected. The traction equipment is connected to the sliding car through the traction rope, and moves forward slowly and evenly to pull the bottom cover to the side of the existing highway.

5. The sliding demolition construction method for the bottom-covering and road-sealing-free high-speed steel box girder according to claim 4 is characterized in that: The step 4 also includes: During each process of releasing a connection point, tighten the corresponding connecting rope. After tightening, ensure that there is no downward force when the original connection point is released, and then fix the connecting rope. During the dismantling process, if there is any abnormality, stop the operation immediately and take reinforcement measures.

6. The sliding demolition construction method for the bottom-covering and road-sealing-free crossing of a high-speed steel box girder according to claim 4 is characterized in that: After releasing the connection between the bottom cover and the steel box girder, use grinding tools to grind the scratches, wear and rust spots on the surface of the steel box girder after the bottom cover is removed. Keep a smooth transition at the edge of the grinding area to avoid the formation of stress concentration points, and then spray paint for repair.

7. The sliding demolition construction method for the bottom-covering and road-sealing-free high-speed steel box girder according to claim 4 is characterized in that: The angle between the traction rope and the guardrail is no greater than 60 degrees.

8. The sliding demolition construction method for the bottom-covering and road-sealing-free high-speed steel box girder according to claim 1 is characterized in that: The step five specifically includes: The lifting equipment is deployed on one side of the existing highway. After the basket bottom slides to that side, the lifting equipment is connected to the basket bottom through the lifting device. There are no less than four connections between the lifting device and the basket bottom, which are evenly distributed around the center of gravity of the basket bottom. Then the connection between the sliding vehicle and the basket bottom is released, and the basket bottom is lifted to the designated location by the lifting equipment.

9. The sliding demolition construction method for the bottom-covering and road-sealing-free high-speed steel box girder according to claim 1 is characterized in that: The sliding vehicle includes a load-bearing rod and an auxiliary rod. A limiting groove is provided at the top of the load-bearing rod along its entire length. The auxiliary rod is arranged at the end of the load-bearing rod and extends to the same side of the load-bearing rod. Roller assemblies are provided on the inner sides of the load-bearing rod and the auxiliary rod.

10. The sliding demolition construction method for the bottom-covering and road-sealing-free high-speed steel box girder according to claim 9 is characterized in that: The roller assembly comprises a fixed wheel set and an adjusting wheel set, wherein the fixed wheel set is fixedly connected to the load-bearing rod and one of the auxiliary rods, and the adjusting wheel set is detachably connected to the other of the auxiliary rods.

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