Escort measures shall be taken for the transportation of out of gauge parts.
8.
Site layout and requirements: before installation, the site shall be leveled and hardened, the places with relatively soft ground shall be treated with lime soil, and temporary construction access roads shall be set for the steel box girder to reach the designated hoisting position after being transported to the site.
According to relevant national and local regulations, over limit vehicles are prohibited on expressways.
Solutions to the problems encountered along the route: the Provincial Department of transportation and the Provincial Traffic Police Corps coordinate the highway administration and traffic police management departments of cities along the line to apply for out of gauge transportation passes.
2.
4.2 there are 7 groups of temporary supports for construction jacking, of which ZJ3 is the traction support, which is equipped with 200t continuous traction jack, and the other supports are equipped with slideway, limit device, jacking Jack and other equipment.
The crane slowly hooks up to make the crane bear the weight of the steel box girder.
3.
6.
4.
Construction of temporary facilities for jacking 4.1 according to the actual situation on site, Section C shall be assembled and welded from the east side of * * expressway, and then pushed to the design position.
Adjust in place and accurately adjust the plane and elevation position of steel box girder with Jack to meet the requirements of design and relevant specifications.
The crane will install the steel box girder in place by rotating, luffing and loosening the hook, and adjust the axis, mileage and elevation.
1、 Installation scheme design 1.
Expressway lanes are mostly one-way and two lane, that is, one lane, one overtaking lane and another emergency parking lane.
Because the transportation is beyond the limit, when passing through the national highway entrance and each road intersection, due to the large traffic flow and narrow road surface, the transportation team will cause short-term traffic congestion and affect the passage of vehicles.
Both ends of the steel beam are placed on the temporary support, and the middle is placed on the permanent pier.
When the vehicle is running, it only needs to consider the problem of overtaking in the same direction, which will not affect the vehicles running in the same direction.
After bolting, it will be welded.
After the height exceeds 1m of the pier column cap beam and temporary buttress, slowly adjust the rotating arm, and stop after reaching the installation position.
The steel box girder and guide beam are pushed to the design position by 200t continuous jack, and the guide beam is removed to complete the whole pushing process.
After the steel box girder hoisting support and jacking facilities are installed, the C section of the steel box girder and the pre assembly of the cutting section of section B and the guide beam shall be carried out on the temporary support.
The landing shall be carried out at multiple points at the same time, and each landing shall not exceed 2cm: the top surface of the slideway shall be coated with silicone grease for lubrication to reduce friction.
It is necessary to coordinate the expressway management department and traffic police management department, which is difficult to coordinate and the escort cost is high.
Firstly, the * * high-speed traffic flow is guided and changed, the * * direction traffic flow drives the * * direction lane, the * * direction traffic flow is diverted, and a new temporary lane is built on the west side of the * * high-speed.
Debug the jacking system and fixed deviation correction device, test the jacking for 4m, eliminate the possible hidden dangers in the jacking process, and continue the jacking after the equipment is checked to be correct; Formal jacking shall be carried out after trial jacking; It is estimated that it will take 13 hours to push to the design position: start the formal push.
Steel box girder transportation scheme * * steel box girder transportation scheme on the east side of the expressway: steel box girder production base – * * Expressway – construction site * * steel box girder transportation scheme on the west side of the expressway: steel box girder production base – * * Expressway – * * toll station – * * provincial road – * * road – construction access road – construction site transportation route advantages: there are few man-made obstacles in this operation route, Most toll stations are equipped with semi open super wide lanes, the minimum height of air obstacles is not less than 5m, and there are no hard obstacles when passing through, so as to meet the transportation requirements of bridges.
The vehicle runs smoothly on the expressway with few objective factors affecting the operation, which can fully realize the purpose of safe and fast transportation.
The treated site shall ensure the smooth passage and operation of 150t beam carrier and 250t truck crane.
8.
Problems in the route: vehicles running on the expressway have high speed and hidden dangers.
5.
Hoisting the steel box girder of the remaining beam section 8.1a-b1, with a total length of 22.989 m, a width of 3.830 m, a height of 1.35 m and a weight of 48.6 t.
In order to ensure the smooth transportation, our company specially sends technicians and vehicles to conduct route survey before transportation.
During the push, there will be a special person for unified command.
7.
250t truck crane and beam carrier are parked outside the box girder..
The cross high-speed section C is assembled by truck crane, dragged to the design position by continuous jack, and the steel box girder section C is accurately positioned by Jack, After completion, the remaining sections shall be hoisted successively by truck crane.
Both ends of the steel beam are placed on the temporary support, and the middle is placed on the permanent pier.
According to the provided equipment list and field measurement, this route can meet the transportation requirements.
After the steel box girder section and the guide beam are connected, the jacking jack for support shall be lowered to make the steel box girder and the guide beam fall on the slide, the deviation correction equipment shall be fixed, and the jacking jack shall be withdrawn.
After checking that the stress of the steel wire rope and snap ring and the lifting lug are normal, the crane lifts the steel box girder.
250t truck crane and beam carrier are parked outside the box girder.
If two lanes need to be occupied during the whole process of transportation, it is necessary to apply for traffic police and road administration escort.
The center of the steel beam lifting point is located within 10 # m of the crane operation radius.
The steel box girder of section 2a-b2 has a total length of 22.989 ， m, a width of 3.230 ， m, a height of 1.35 ， m and a weight of 43.9 ， t.
Steel box girder installation steps: the steel box girder sections of the project are processed and fabricated in the factory, pre assembled after fabrication, painted after pre assembly, and transported to the installation site after passing the acceptance.
A person will be arranged at each slide position to observe the operation of the slide, monitor the pushing force of the traction jack and the overall lateral movement of the steel box girder at any time, report the problems immediately and push again after they are solved.
