Construction method for erecting prefabricated box girders through walking type bridge girder erection machine

A technology of box girder construction and bridge erecting machine, which is applied in the direction of erecting/assembling bridges, bridges, bridge construction, etc., can solve the problems of complex construction conditions, low construction efficiency, high risk factor, etc., achieve good social and economic benefits, reduce The effect of construction costs

Inactive Publication Date: 2016-11-23
JINAN URBAN CONSTR GRP
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AI-Extracted Technical Summary

Problems solved by technology

The current prefabricated box girder hoisting construction technology requires repeated support and removal by crane hoisting, the construction efficiency is low, the risk factor is high, and cert...
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Abstract

The invention relates to the field of bridge construction, in particular to a construction method for erecting prefabricated box girders through a walking type bridge girder erection machine. The method includes the steps that the prefabricated box girders transported through a girder transporting vehicle are lifted at the rear end of the bridge girder erection machine; components such as front and rear supporting legs and middle and rear carrying wheels of the bridge girder erection machine are adjusted; the bridge girder erection machine is pushed to move forwards when the weight of the bridge girder erection machine is kept balanced; the front supporting legs of the bridge girder erection machine are moved to a pier cover beam to be erected and stridden at the front position, the rear supporting legs support the top faces of the font ends of the erected box girders, and therefore a hole passing purpose is achieved; and then a girder transporting crane on the bridge girder erection machine is used for lifting the box girders. By the adoption of the construction method, the defects that a crane needs to be repeatedly erected and moved, the construction efficiency is low, and the risk coefficient is high are overcome. A construction period can be guaranteed, normal construction and vehicle passage of a road under a bridge are guaranteed as well, meanwhile, the construction cost is reduced, the safety coefficient is high, social benefits and economic benefits are good, the method is suitable for being applied to urban prefabricated box girder lifting projects and particularly suitable for lifting of the relatively high prefabricated box girders of the bridge over water.

Application Domain

Technology Topic

Safety coefficientBox girder +3

Examples

  • Experimental program(1)

Example Embodiment

[0022] Before using this kind of walking bridge erection frame to set up the prefabricated box girder construction method, make the construction preparation: all the beam pieces can be transported and installed after passing the inspection by the supervision engineer and the project quality inspection engineer, and the beam body is required to be checked before installation. The overall dimensions, concrete strength, pre-embedded steel bars (pieces) dimensions and positions, hoisting hole positions, scupper hole positions, tension and grouting quality, concrete appearance quality, end sealing quality, etc., can be installed only after meeting the requirements. Strictly check the size, appearance quality, concrete strength, tension and grouting quality of each part of the beam body, check the position and quantity of pre-embedded steel bars (pieces), and strictly check the construction joint treatment of the connection parts that require post-cast concrete. All granules and laitance should be removed to expose the fresh concrete surface.
[0023] The quality inspector is responsible for collecting the bridge erection machine and personnel entry data and reporting it to the supervisor for review, including the mechanical qualification certificate, the bridge machine manufacturer qualification and personnel identity information, and the special operator operation certificate. And do a good job in the bridge machine assembly, commissioning and inspection work.
[0024] After completing the assembly of the bridge erecting machine and passing the acceptance check, proceed to the following steps:
[0025] 1) The first span box girder erection:
[0026] First, the beam is fed by the beam transporting flat car, and the beam transporting flat car is started to transport the box girder to the middle supporting wheel, so that the front lifting point of the box girder is placed under the front crane, and the front end of the box beam is hoisted; at the same time, the front crane and the beam transporting flat car are driven. The rear wheels move forward synchronously, so that the rear lifting point of the box girder is located below the rear crane waiting at the middle supporting wheel; then the rear crane is lifted, and the two cranes move forward with the box girder until the box girder reaches the top of the two bridge piers; The beam falls 5 to 15 cm away from the cover beam; the bridge erection machine moves laterally, and the wheel boxes of the front outrigger and the middle support move along their respective lateral rails synchronously. When they reach the beam position, the beam falls and falls on the support to complete a Box girder installation.
[0027] 2) Vias:
[0028] a: Lift the rear supporting roller and front outrigger, use the hoisting crane to move the middle supporting roller and the middle supporting roller horizontally by 30 meters to the end of the box girder that has been hoisted, and move the rear supporting roller forward 10 meters;
[0029] b: The box girder is transported to the rear position of the middle supporting wheel with the beam transporting flat car, and the two hoisting cranes are retreated to the rear of the middle supporting wheel, and the front end of the box girder is hoisted by the rear crane, and the front crane is connected with the middle supporting wheel;
[0030] c: Put away the front outriggers and rear outriggers, start the middle supporting wheel group to push the main beam frame forward by 16 meters, and the box beam will not move; put down the rear outriggers, use the front crane to move the rear supporting rollers forward by 18 meters, and at the same time the box beam The beam and the rear car follow up to the rear position of the rear supporting wheel;
[0031] d: Raise the rear supporting roller, retract the rear outrigger, start the middle supporting roller group to push the main girder frame forward by 14 meters, and the box beam does not move; disconnect the front crane from the rear supporting roller, and lift the front outrigger track. Move to the previous cover beam, and after laying and leveling, set the front outriggers on the track;
[0032] e: Disconnect the rear crane from the box girder, move the truck to the back of the middle supporting wheel for two days, start the beam transport flat car to transport the box beam to the middle supporting wheel, and start the next span of box girder hoisting.
[0033] 3) The beam body traverses to the in-position position: the front outrigger traverse wheel set and the middle support lower traverse wheel set move at the same time, in the same direction and at the same speed, and drive the bridge erection machine to move laterally with the beam pieces.
[0034] 4) Drop beam: drop the box beam onto the support of the bridge pier. The strength of concrete shall not be lower than 75% of the design strength when demoulding. In order to ensure the same color, it should be dried in the shade for half a day after demoulding, and then covered with felt and sprinkled with water to maintain health. Carry out a comprehensive inspection of the box girder concrete, find out the problem and analyze the cause in time, and correct it in time.
[0035] 5) The return of the bridge erecting machine: firstly, the hoisting trolley is moved laterally: the spreader is removed, the steel wire rope is retracted, and the two hoisting trolleys are moved laterally to the middle of the crane beam; secondly, the bridge erecting machine is moved laterally: the bridge erecting machine is moved laterally to the beam feeding position ; Finally, the crane returns to the position of the rear outriggers, and is ready to hoist the next box girder.
[0036] After the hoisting is completed, check and accept: check whether the position of the box girder along the bridge is accurate according to the center line of the bearing, and use a total station to measure the direction of the longitudinal axis of the bridge, and the deviation should be controlled within 10mm. The unqualified ones should be reworked and re-hoisted and installed until they meet the specification requirements. Ensure that the bridge is in good shape.
[0037] Quality standard: According to the requirements of relevant specifications and drawings, the quality standards are as follows:
[0038] The horizontal running track of the front outrigger and the middle supporting wheel requires strict control of the spacing, the two tracks must be parallel, the gauge error of the bridge erection machine is not more than 2mm, and the height difference of the adjacent track joints is not more than 1mm.
[0039] Along the longitudinal axis of the bridge, the deviation should be controlled within 10mm.
[0040] Except for the technical features described in the description, other technical features are known technologies by those skilled in the art.
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Classification and recommendation of technical efficacy words

  • Reduce construction costs
  • Good economic and social benefits
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