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Crane bridge deformation causes and repair methods
2015-01-21 15:44
Crane bridge deformation causes and repair methods
Metal structural deformation is relatively common problem, but as a type of crane bridge carrying the main component of the main beam is the inevitable question, in order to avoid the occurrence of deformation of the bridge, the company's technical staff to solve this problem do the following research:
1, the bridge deformation forms: the main beam arch decreases, lateral bending, web wave deformation, deformation of the end beam, diagonal tolerance.
2, deformation reasons
2.1 main reasons for the reduction beam camber
(1) The structure of internal stress.
(2) Overload and unreasonable use.
(3) The impact of high temperature environment.
(4) The impact of design and manufacturing processes.
(5) An unreasonable lifting cranes, storage and installation.
(6) Unreasonable repair.
The reason lateral bending produced 2.2
(1) The use of curved levels generated.
Prefabricated lateral bending (2) manufacturing process requirements.
(3) Due to restructuring produce curved horizontal structural member.
(4) Since the horizontal inertia force, the main beam causing inward bending.
Causes girder web 2.3 wave transformation
When the web splicing, due to the uneven plate itself (before neither welding nor the leveling process), the role of welding stress, resulting in a web of wave deformation.
2.4 end of the beam deformation reasons
(1) In order to enhance the rigidity of the main beam is coupled with the end of the beam, and sometimes the use of units of welding a steel plate (or large angle) in the main beam of the head and the end beam, resulting in end beam bending outward.
(2) If the rail carts serious bite, under the action of lateral force, will result in the end beam deformation.
(3) Due to the use of the main beam under flexural deformation, can cause side beam deformation.
2.5 diagonal deformation tolerance reasons
Main end beam connecting horizontal deformation direction.
3. Fix the bridge deformation: strands tensioning method prestressing wire rope tensioning, flame straightening method.
Metal structural deformation is relatively common problem, but as a type of crane bridge carrying the main component of the main beam is the inevitable question, in order to avoid the occurrence of deformation of the bridge, the company's technical staff to solve this problem do the following research:
1, the bridge deformation forms: the main beam arch decreases, lateral bending, web wave deformation, deformation of the end beam, diagonal tolerance.
2, deformation reasons
2.1 main reasons for the reduction beam camber
(1) The structure of internal stress.
(2) Overload and unreasonable use.
(3) The impact of high temperature environment.
(4) The impact of design and manufacturing processes.
(5) An unreasonable lifting cranes, storage and installation.
(6) Unreasonable repair.
The reason lateral bending produced 2.2
(1) The use of curved levels generated.
Prefabricated lateral bending (2) manufacturing process requirements.
(3) Due to restructuring produce curved horizontal structural member.
(4) Since the horizontal inertia force, the main beam causing inward bending.
Causes girder web 2.3 wave transformation
When the web splicing, due to the uneven plate itself (before neither welding nor the leveling process), the role of welding stress, resulting in a web of wave deformation.
2.4 end of the beam deformation reasons
(1) In order to enhance the rigidity of the main beam is coupled with the end of the beam, and sometimes the use of units of welding a steel plate (or large angle) in the main beam of the head and the end beam, resulting in end beam bending outward.
(2) If the rail carts serious bite, under the action of lateral force, will result in the end beam deformation.
(3) Due to the use of the main beam under flexural deformation, can cause side beam deformation.
2.5 diagonal deformation tolerance reasons
Main end beam connecting horizontal deformation direction.
3. Fix the bridge deformation: strands tensioning method prestressing wire rope tensioning, flame straightening method.
