Steel box girder whole segment through low support sliding into place construction method

Abstract

This invention discloses a construction method for the sliding placement of entire steel box girder segments using low-profile supports. The method involves a steel box girder and a support system whose overall installation principle is "first the trestle, then the sliding track." An 80t crawler crane, in conjunction with a 90mm vibratory hammer, drives steel pipe piles to the designed depth. After checking the verticality of the steel pipe piles, the installation proceeds from bottom to top, sequentially completing the installation of the pile head transverse distribution beam, longitudinal Bailey beam, transverse I-beams, and trestle deck panels. The steel box girder segments are transported to the site and can be assembled and aligned within the assembly area. This method facilitates alignment control of the steel box girder and improves work efficiency, conforming to the characteristics of prefabricated and modular bridge structure construction. It reduces the erection height of the support system, helps control construction costs, and significantly reduces construction safety risks.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering technology, specifically a construction method for sliding a steel box girder segment into place using a short support. Background Technology

[0002] Prefabricated construction is a key direction for highway construction development. It can help save resources and energy, reduce construction pollution, improve labor productivity and quality and safety levels, promote the deep integration of the construction industry and information industrialization, cultivate new industries and new driving forces, and help resolve excess capacity.

[0003] Steel box girders are increasingly favored and attracting attention due to their advantages such as good torsional resistance, fast construction speed, and reduced impact on traffic. Furthermore, steel structure bridges meet the development requirements of prefabricated construction. With the increase in China's steel production and the development of steel structure processing and manufacturing technology, the number of steel bridges built in recent years has been increasing and accelerating year by year. With the continuous accumulation of experience in design, manufacturing, and erection, more and more steel box girder bridges are being used in cross-river cable-stayed bridges. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution: a construction method for sliding a steel box girder segment into place using a short support, comprising a steel box girder,

[0005] S1. Based on the work area and overall construction plan provided on site, allocate sufficient personnel. All personnel must receive safety and technical briefings. Special operation personnel must be certified to work. Sufficient production materials must be prepared before construction. Main materials such as steel pipe piles, I-beams, and channel steel must meet relevant technical standards. Tests must be conducted before use, and unqualified products must not be used.

[0006] S2. All machinery and equipment must meet the requirements of relevant laws and regulations. They must be installed, debugged and tested before entering the site and can only be used after passing the test. Safety production briefings must be given to on-site workers to clarify the on-site construction hazards and precautions to ensure construction safety. The support system and bridge deck lifting equipment must be designed and calculated by a qualified unit and approved by experts. The on-site implementation must be strictly in accordance with the calculated and reviewed plan.

[0007] S3. The overall installation principle of the support system is "first the trestle, then the sliding track". One 80t crawler crane and a 90 vibratory hammer are used to drive the steel pipe piles into the design depth. After checking the verticality of the steel pipe piles, the installation of the pile head transverse distribution beam, longitudinal Bailey beam, transverse I-beam and trestle panel is completed from bottom to top. After the trestle construction is completed, the crawler crane drives into the trestle and then the construction of the sliding track on both sides is carried out.

[0008] S4. After the steel box girder segments are assembled in the assembly site, the girder transport trolley is slid under the beam via the track. Four 250t jacks are used to lift the steel box girder. Double 50 I-beams are used to support the bottom of the beam. After the support is supported, the oil is returned to the jacks. After the trolley is powered on, it is controlled by the remote control to move synchronously and transport the steel box girder into place.

[0009] S5. Except for the different weight of the internal steel anchor boxes, the other components of the standard section steel box girder are the same. The heaviest section weighs 205.5t. Considering the safety factor of lifting the steel box girder, it is planned to set up one lifting device for each section, and a total of two 200t hydraulic continuous jacks for lifting operations.

[0010] S6. Considering the high accuracy requirements for installation and positioning, a small crossbeam is installed at the top of the front beam of the lifting equipment, i.e., at the continuous jack. Longitudinal and transverse adjustment devices are installed on it to adjust the positioning of the steel box girder.

[0011] Preferably, after the steel box girder is lifted into place by the bridge deck lifting equipment, it is positioned according to the monitoring coordinates and elevation by the longitudinal and transverse adjustment devices on the equipment. Then, the girder segments are promptly circumferentially welded, and the alignment is adjusted according to the monitoring data. After the requirements are met, the cable stay construction is carried out.

[0012] Preferably, the steel pipes are connected by scissor bracing and horizontal bracing, plus transverse double-span 40a I-beams, longitudinal Bailey beams, and transverse double-span 25a I-beams for track distribution beams, with a longitudinal spacing of 12m between the steel pipe piles of the steel trestle bridge.

[0013] Preferably, the steel pipe piles of the sliding track are 4.65m away from the steel pipe piles of the trestle bridge, with a longitudinal spacing of 6m. From bottom to top, they are set as 630×10mm steel pipe piles + transverse double-section 50a I-beams + longitudinal double-section HN600*200 steel sections + P43 heavy-duty track + beam transport trolley.

[0014] Preferably, the equipment box-shaped longitudinal beams are connected and extended by high-strength bolts, and the steel box beams are anchored with precision-rolled threaded steel using lifting lugs. Traveling wheels are installed at the equipment support points, and two 20t through-hole jacks are used for movement. The steel box beams are lifted using two 200t hydraulic continuous jacks.

[0015] Preferably, during the lifting of the beam segment, the two continuous jacks must be "synchronized". Synchronization can be controlled by a control system. Sensors provide real-time feedback on the actual stroke of each cylinder, and the control system adjusts the corresponding proportional valves of the pump station in real time to control the working status of the cylinders and achieve synchronous operation of each cylinder.

[0016] Preferably, the welding equipment is inspected regularly, and the actual current and voltage during welding are checked to ensure that they are consistent with the indications on the equipment, so as to ensure that the welding equipment is in good condition and to repair or replace equipment that does not meet the welding requirements in a timely manner.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] The present invention allows steel box girders to be transported in sections to the site for assembly and alignment matching, which is beneficial for the alignment control of steel box girders and the improvement of work efficiency, and conforms to the characteristics of prefabricated and modular bridge structure construction.

[0019] It can reduce the erection height of the support system, which is conducive to controlling the investment cost of engineering construction and greatly reducing construction safety risks;

[0020] Using a sliding trolley to transport and position the entire steel box girder segment facilitates assembly line operations and improves work efficiency. Attached Figure Description

[0021] Figure 1 This is a process flow diagram of the present invention;

[0022] Figure 2 This is a cross-sectional view of the short support system of the present invention;

[0023] Figure 3 This is a schematic cross-sectional view of the bridge deck lifting device of the present invention;

[0024] Figure 4 This is a schematic diagram of the bridge deck lifting device of the present invention before lifting. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Please see Figure 1-4 This invention provides a technical solution: a construction method for sliding a steel box girder segment into place using a low-profile support, comprising a steel box girder.

[0027] S1. Based on the work area and overall construction plan provided on site, allocate sufficient personnel. All personnel must receive safety and technical briefings. Special operation personnel must be certified to work. Sufficient production materials must be prepared before construction. Main materials such as steel pipe piles, I-beams, and channel steel must meet relevant technical standards. Tests must be conducted before use, and unqualified products must not be used.

[0028] S2. All machinery and equipment must meet the requirements of relevant laws and regulations. They must be installed, debugged and tested before entering the site and can only be used after passing the test. Safety production briefings must be given to on-site workers to clarify the on-site construction hazards and precautions to ensure construction safety. The support system and bridge deck lifting equipment must be designed and calculated by a qualified unit and approved by experts. The on-site implementation must be strictly in accordance with the calculated and reviewed plan.

[0029] S3. The overall installation principle of the support system is "first the trestle, then the sliding track". One 80t crawler crane and a 90 vibratory hammer are used to drive the steel pipe piles into the design depth. After checking the verticality of the steel pipe piles, the installation of the pile head transverse distribution beam, longitudinal Bailey beam, transverse I-beam and trestle panel is completed from bottom to top. After the trestle construction is completed, the crawler crane drives into the trestle and then the construction of the sliding track on both sides is carried out.

[0030] S4. After the steel box girder segments are assembled in the assembly site, the girder transport trolley is slid under the beam via the track. Four 250t jacks are used to lift the steel box girder. Double 50 I-beams are used to support the bottom of the beam. After the support is supported, the oil is returned to the jacks. After the trolley is powered on, it is controlled by the remote control to move synchronously and transport the steel box girder into place.

[0031] S5. Except for the different weight of the internal steel anchor boxes, the other components of the standard section steel box girder are the same. The heaviest section weighs 205.5t. Considering the safety factor of lifting the steel box girder, it is planned to set up one lifting device for each section, and a total of two 200t hydraulic continuous jacks for lifting operations.

[0032] S6. Considering the high accuracy requirements for installation and positioning, a small crossbeam is installed at the top of the front beam of the lifting equipment, i.e., at the continuous jack. Longitudinal and transverse adjustment devices are installed on it to adjust the positioning of the steel box girder.

[0033] After the steel box girder is lifted into place by the bridge deck lifting equipment, it is positioned according to the monitoring coordinates and elevation by the longitudinal and transverse adjustment devices on the equipment. Then, the girder segments are promptly circumferentially welded, and the alignment is adjusted according to the monitoring data. After meeting the requirements, the cable stay construction is carried out. The steel pipes are connected by scissor bracing and flat bracing + transverse double 40a I-beams + longitudinal Bailey beams + transverse double 25a I-beams for the track distribution beam. The longitudinal spacing of the steel pipe piles of the steel trestle is 12m. The distance between the steel pipe piles of the sliding track and the steel pipe piles of the trestle is 4.65m and the longitudinal spacing is 6m. From bottom to top, it is set as 630×10mm steel pipe piles + transverse double 50a I-beams + longitudinal double HN600*200 steel + P43 heavy rails + girder transport trolley.

[0034] The equipment's box-type longitudinal beams are extended by high-strength bolts and anchored using precision-rolled threaded steel with lifting lugs designed into the steel box beams. Traveling wheels are installed at the equipment's support points, and two 20t through-hole jacks are used for movement. The steel box beams are lifted using two 200t hydraulic continuous jacks. During beam lifting, the two continuous jacks must operate synchronously. This synchronization is controlled by a control system that uses sensors to provide real-time feedback on the actual stroke of each cylinder. The control system adjusts the corresponding proportional valves in the pump station in real-time to control the cylinder's working state, ensuring synchronous operation of each cylinder. Regular inspections of the welding equipment are conducted, and random checks are performed to verify that the actual current and voltage during welding match the equipment's indications, ensuring the welding equipment is in good working order. Equipment that fails to meet welding requirements is promptly repaired or replaced.

[0035] Working principle: During use, the low support structure consists of a steel trestle bridge and sliding supports on both sides. The steel trestle bridge, from bottom to top, is configured as follows: φ630×10mm steel pipe piles + transverse double-span 40a I-beams + longitudinal Bailey beams + transverse 25a I-beam track distribution beams + integral bridge deck (12 I-beams + 8mm thick steel plates). The sliding track supports on both sides, from bottom to top, are configured as follows: φ630×10mm steel pipe piles + transverse double-span 50a I-beams + longitudinal double-span 60H-beams + P43 steel rails. The girder transport trolley uses two bridge deck lifting equipment platform cranes with a rated lifting capacity of not less than 135t to install the steel box girder. The lifting equipment consists of a lifting mechanism, a lifting device, and a traveling mechanism. The lifting mechanism is modified from a hanging basket box-type main truss girder, which can make full use of idle resources and reduce construction costs. The lifting mechanism adopts continuous hydraulic synchronous lifting technology with steel strands as lifting locks, which has a series of unique advantages such as safety, reliability, light weight of the load-bearing components, convenient transportation and installation, and no need for intermediate splicing.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A construction method for sliding a steel box girder segment into place using a low-profile support, comprising a steel box girder, characterized in that: S1. Based on the work area and overall construction plan provided on site, allocate sufficient personnel. All personnel must receive safety and technical briefings. Special operation personnel must hold certificates to work. Sufficient production materials must be prepared before construction. The main materials of steel pipe piles, I-beams, and channel steel must meet the relevant technical standards. Tests must be conducted before use. Unqualified products are not allowed to be used. S2. All machinery and equipment must meet the requirements of relevant laws and regulations. They must be installed, debugged and tested before entering the site and can only be used after passing the test. Safety production briefings must be given to on-site workers to clarify the on-site construction hazards and precautions to ensure construction safety. The support system and bridge deck lifting equipment must be designed and calculated by a qualified unit and approved by experts. The on-site implementation must be strictly in accordance with the calculated and reviewed plan. S3. The overall installation principle of the support system is "first the trestle, then the sliding track". One 80t crawler crane and a 90 vibratory hammer are used to drive the steel pipe piles into the design depth. After checking the verticality of the steel pipe piles, the installation of the pile head transverse distribution beam, longitudinal Bailey beam, transverse I-beam and trestle panel is completed from bottom to top. After the trestle construction is completed, the crawler crane drives into the trestle and then the construction of the sliding track on both sides is carried out. S4. After the steel box girder segments are assembled in the assembly site, the girder transport trolley is slid under the beam via the track. Four 250t jacks are used to lift the steel box girder. Double 50 I-beams are used to support the bottom of the beam. After the support is supported, the oil is returned to the jacks. After the trolley is powered on, it is controlled by the remote control to move synchronously and transport the steel box girder into place. S5. Except for the different weight of the internal steel anchor boxes, the other components of the standard section steel box girder are the same. The heaviest section weighs 205.5t. Considering the safety factor of lifting the steel box girder, it is planned to set up one lifting device for each section, and a total of two 200t hydraulic continuous jacks for lifting operations. S6. Considering the high accuracy requirements for installation and positioning, a small crossbeam is installed at the top of the front beam of the lifting equipment, i.e., at the continuous jacks. Longitudinal and transverse adjustment devices are installed on this crossbeam to adjust the positioning of the steel box girder. After the steel box girder is lifted into position by the bridge deck lifting equipment, it is positioned according to the monitoring coordinates and elevation using the longitudinal and transverse adjustment devices on the lifting equipment. Ring welding of the girder segments is then carried out promptly, and alignment adjustments are made based on monitoring data. Once the requirements are met, the cable-stayed bridge construction proceeds. The steel pipes are connected using scissor bracing and horizontal bracing, plus transverse double-span 40a I-beams, longitudinal Bailey beams, and transverse double-span 25a I-beams for the track distribution beams. The longitudinal spacing of the steel pipe piles on the steel trestle is 12m. The steel pipe piles of the sliding track are 4.65m away from the steel pipe piles of the trestle, with a longitudinal spacing of 6m, and are installed from bottom to top. The system consists of 630×10mm steel pipe piles, transverse double-section 50a I-beams, longitudinal double-section HN600*200 steel sections, P43 heavy-duty rails, and a beam transport trolley. The box-shaped longitudinal beams of the lifting equipment are extended by high-strength bolts and anchored with precision-rolled threaded steel using lifting lugs designed into the steel box beams. Walking wheels are installed at the support points of the lifting equipment, and two 20t through-hole jacks are used for movement. The steel box beam is lifted using two 200t hydraulic continuous jacks. During the beam segment lifting process, the two continuous jacks must be synchronized. Synchronization is controlled by a control system. Sensors provide real-time feedback on the actual stroke of each cylinder, and the control system adjusts the corresponding proportional valves of the pump station in real-time to control the working state of the cylinders, achieving synchronized operation of each cylinder. Regularly inspect welding equipment and randomly check whether the actual current and voltage during welding are consistent with the indications on the welding equipment to ensure that the welding equipment is in good condition. Repair or replace welding equipment that does not meet the welding requirements in a timely manner.

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