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The development of a new generation of bridge erection machines is imminent

In order to adapt to the new era of railway construction

China Railway Construction Fifth Engineering Group Co., Ltd. R&D Team

Take on the important task of developing a new generation of bridge erecting machines

Engineers work day and night to overcome difficulties

Finally took outDesign scheme of lower guide beam bridge erecting machine

But the weight of the whole equipment is nearly 1450 tons.

Although the functionality meets the requirements

However, there are still some deficiencies in terms of economy and adaptability to special working conditions.

After rejecting the design of the lower guide beam bridge erection machine

Engineers selectedUpper guide beam bridge erection machine solution

This designIntegrates beam transportation and beam erection in one

However, the main beam strength of the bridge erection machine is difficult to meet the requirements

This "steel behemoth" does not have a strong enough "backbone"

When lifting the box girder at high altitude, it may be crushed.

Engineers designed the main beam height of the bridge erector to be 5 meters

In order to make the beam have enoughLongitudinal and lateral stability

Innovative adoptionDouble π-type structureandTrapezoidal connection system

New structural design combined with high-strength steel manufacturing

Let the new generation of bridge erection machine haveA strong and resilient backbone

With the problem of the "backbone" of the bridge erection machine successfully solved

Design work of my country's new generation of aerial bridge-laying machine

Entering the fierce battle stage

What kind of "legs" support the "backbone" of the bridge erector?

New challenges are facing engineers

When the bridge erection machine of the upper guide beam scheme crosses the bridge pier and erects the bridge

Need to be like Transformers

Unfold the triangular legs folded under the body

Supported on the first pier

Part of the weight of the bridge erector and box girder

Will gradually transfer to smallTriangular legssuperior

As the bridge-building machine continues to move forward

The load on the outriggers is also increasing.

The forward thrust also acts on the triangular legs.

If we can't resolve this push

The triangular legs will be pushed down

The giant steel object fell from a height of tens of meters.

To solve this problem

Engineers figured it out

Strength of bridge erecting machine main beam and triangular legs

The relationship between size and deformation and the logical relationship between movement

And formed a set of algorithms

Above the triangular legs

Design a set of parts in contact with the main beamRoller

As the bridge-erecting machine moves forward

This set of rollers will rotate forward

This can offset the thrust generated by the bridge crane moving forward.

Engineers also designed the originally smooth roller toarc

Increased contact area between roller and main beam guide rail

SolvedRoller running smoothnessquestion

In the subsequent R&D test process

Engineers cooperate with domestic bearing manufacturers

Create a strong and flexibleSpherical bearings

AsMetal jointsConnecting the rear carriage of the bridge erector to the main beam

Ensures the precise positioning of the 100-meter-long fuselage on the curved bridge

Outrigger movementThe problem is also in the follow-upOn-site application solution

“The vast Kunlun Mountains suddenly appeared, and all the spring scenery in the world was seen.

In a shortMore than 200 daysinside

commonErection of 298 40-meter high-speed railway box girders

Successfully completed the construction of the Meizhou Bay Cross-sea Bridge

And save a lot of time and cost for construction projects

As a national heavy weapon in the new era

The Kunlun model is also permanently collected by the National Museum of China.

The Shuohuang Railway was completed in 1999.

It is a heavy-duty railway connecting Shuozhou City and Huanghua Port in Cangzhou City.

The total length of its main line is nearly 598 kilometers.

It is the main transportation artery for transporting coal from north to south in my country.

However, many bridges on this railway are

Serious aging problems

Maintenance work puts new demands on beam replacement equipment

Engineers have started to develop the "Taihang" beam replacement machine

To "perform surgery" on the bridge

To ensure that every train arrives at its destination on time

Beam replacement must be carried out within a 4-hour window

To complete a complex process in such a short time

You are also not allowed to touch the electrified facilities on both sides of the railway or above it.

After extensive research, engineers

Selected“Two cars and one plane”Solution

The height of the beam changing machine chassis plus the height of the bridge beam

Must be controlled within this range

Engineers willThe height of the car is controlled1.2 mWithin

Ensure the smooth operation of the entire beam changing machine

Normally folded and laid flat

It is necessary not to touch the electrical equipment along the line

In the caseArrival at the work site

At onceUnfold like a butterfly

In order to make this set of movements go smoothly

And it can withstand hundreds of tons of pressure after unfolding

Engineers analyze the force model of each action one by one

Through mechanical structures such as bearings and cylinders

Reasonable layout to achieve morphological transformation

After the construction of Taihang was completed

Many experiments were carried out on the Shuohuang Railway Experimental Line

Hope to achieve the expected effect of the design

In order to ensure smooth expansion and contraction when the column is under stress

When the "Taihang" enters the construction site to carry out operations

needA team of hundreds of workers cooperated in the construction

If a process fails

Will affect the beam replacement operation

Engineers break down the entire beam replacement operation

useVisual chartShowing every process

Through a smallProcess Card

The workers have a clear view of the entire beam replacement process