2、 Main research contents main research contents: (1) research and application of Prefabrication Yard Layout and beam moving technology (2) research and application of bridge deck construction technology details: research and application of Prefabrication Yard Layout and beam moving technology: 1.

The bridge mileage of the whole line accounts for 64% of the total mileage.

However, the layout of Prefabrication Yard and beam storage area is more flexible, which is not limited by the main line and geographical environment, and does not affect the construction of the main line.

Layout of Prefabrication Yard and transfer platform A.

For this pure bridge sign, there are three kinds of more frequently used and advanced construction technologies in China: (1) the Prefabrication Yard is located outside the red line, And close to the bridge side along the bridge direction.

Lift the beam with hydraulic jack and drive the main beam transport vehicle into the.

fair faced concrete formwork has many turnover times, low maintenance cost and high production efficiency, which can achieve good social benefits..

The jack slowly relieves the pressure.

The Prefabrication Yard is arranged perpendicular to the main line.

Then take 3#, 4# beams as the driving route and transport them to the bridge erecting machine for installation.

The construction period can be guaranteed.

3、 Technical innovation points (1).

Schematic diagram of refitting structure of transverse flat car: (II) research and application of bridge deck construction technology 1.

The beam carrier retreats, and at the same time, the auxiliary beam carrier is adjusted to be in the same straight line with the beam carrier.

When the transverse flat car carrying the beam moves, the U-shaped clamping groove above the auxiliary vehicle of beam transportation rotates with the movement.

D.

B.

Equipment input: one 120t gantry crane, one beam transport vehicle, one transverse flat car, two hydraulic jacks (80t), and the beam transfer track is shared with the Beam Yard track.

Finally, the erected three span beam body is used as the beam transfer site.

After the box girder is lifted onto the bridge, one end is placed on the auxiliary beam transport vehicle, and the other end is placed on the transverse flat car.

90% of the road sections cross fish ponds and XX, and the dry land area is very small, so the construction is very difficult.

1、 Project overview the project is XX to XX section of XX National Expressway, which is the first real XX Expressway in China.

omit the plastering process, reduce the maintenance cost, reduce the total project cost and shorten the construction period.

First, make full use of the gantry crane in the precast beam yard to erect a span of box girder (the 97th span in the figure), complete the assembly of the bridge erecting machine in this span, then go through the hole to the 96th span (or the 98th span), and use the bridge crane to erect the 96th span (or the 98th span) left 1#, 2#, 3#, 4#, right 3#, 4# beams.

The gantry crane in the Prefabrication Yard moves the beam to the lifting area, and then the gantry crane on the bridge lifts the beam to the bridge deck.

The traverse flat car and the auxiliary car of beam transportation are in place on the 1#, 2# beam.

Waved Anchor

The main line is located in the middle section of the super bridge, and fish ponds are dotted along the line: the main line crosses the Dongwan lake fishing ground, with a total length of about 800 meters.

Among them, there are 9 Chunqiao bid sections.

one-time molding, no chiseling and repair, no plastering, reducing construction waste and conducive to environmental protection.

Our bid, together with bid 12 and bid 14, undertook the construction of XX Super Major Bridge with a total length of 7422m and a mileage of 2700m.

Relation diagram between Prefabrication Yard, beam storage area and main line B.

avoid quality hidden dangers such as plaster cracking, hollowing and falling off, and reduce common quality problems such as slurry leakage and cracks.

The upper bridge gantry crane lifts the beam to the bridge deck.

Apply a layer of grease between the upper and lower steel plates to reduce the relative sliding resistance between the upper and lower steel plates when the transverse flat car moves.

The upper part of the bridge is a 25m and 30m span precast box girder, with a total of 740 pieces, and the maximum load weight of a single beam is 97 tons.

The single gantry crane directly moves the beam onto the bridge, and the beam is converted to the beam transport vehicle by refitting the transverse flat car and hydraulic lifting device, and then transported to the bridge erecting machine for installation.

The Prefabrication Yard and beam storage area are directly arranged on the 97th span of the main line and perpendicular to the main line.

The prefabrication gantry crane and beam transfer gantry crane share two parallel tracks, and the track directly runs through the 97th span of the main line.

There is more temporary land and large cost investment.

The device and method of the traverse flat car have been patented.

C.

The girder carrier transports the box girder into the guide beam of the bridge erecting machine, uses the front and rear vehicles of the bridge erecting machine to pull the box girder and move it horizontally to the erection position for installation.

In the process of transverse movement, the beam moves in a circle with the auxiliary vehicle of beam transportation as the center and the distance between the force points at both ends of the beam as the radius.

After the beam end completely falls on the main vehicle, drive the transverse flat car out, and the whole conversion process is completed in about 10 minutes.

After the beam is dropped stably, start the transverse flat car to move laterally between the 3#, 4# beams, and the auxiliary car of beam transportation remains stationary.

2.

(2) The Prefabrication Yard is set outside the red line and perpendicular to the main line.

Moreover, the Prefabrication Yard must be arranged close to the parallel main line beside the bridge, but it does not affect the main line construction, and the construction period can be guaranteed.

After the tensioning and grouting of box girder reaches a certain strength, it is lifted to the bridge deck by 120t gantry crane.

There are 10 super major bridges, 73 medium and large bridges and 5 small bridges.

layout of beam transfer yard.

This method requires two sets (four sets) of large beam moving gantry cranes and an additional beam carrier to complete the box girder bridge process, with more temporary land, greater cost investment, and additional transportation roads.

The feeding process of box girder is as follows: 5T and 10t Gantry Cranes are used for the daily production of box girder.

(2) The lower part of the transverse flat car is refitted into two remote-controlled wheel boxes, which pass through 2.5cm thick steel plate and φ 28 steel bars are welded together, sleepers are placed directly above the wheel boxes on both sides, and two hydraulic jacks are placed in the middle; The superstructure is flexible wood board + upper steel plate + lower steel plate (from top to bottom).

Application of fair faced concrete technology of guardrail – in order to ensure the overall beauty of the bridge and establish the corporate image, our guardrail construction adopts the current advanced fair faced concrete technology.

On the basis of the above method, a beam carrier shall be added to transport the beam from the beam yard to the lifting area.

This method requires two sets (4 sets) of large gantry cranes to be arranged in parallel and overlapped to complete the box girder on the bridge process.

layout of transverse track: when laying transverse track on bridge deck, it is necessary to consider a certain angle, adjust the elevation of track top surface and fix it, and set up up and down ramps on both sides of the track of beam transport vehicle, so that the beam transport vehicle can pass through the track smoothly.

The process has the following four advantages: A.