Bridge expansion joint, expansion device, bridge expansion device, modular expansion joint

  Highway expansion joint is a kind of deformation joint that produces creep deformation under the influence of natural temperature change, concrete shrinkage deformation, external live load and highway bridge's own span
In the construction of modern highway bridges, expansion joints are an important part during the construction period
During the construction, expansion joints of different forms are usually set between the two beam ends of the bridge, between the beam ends and the abutment or at the hinged position in the middle of the bridge, so as to meet the requirements of surface deformation of highway bridges
The expansion joints of highway bridges shall be set up in 1
The expansion joints must be moral or perpendicular to the two directions of the bridge axis, and can expand freely, firm and reliable, so as to avoid the & ldquo; Jump & rdquo; Phenomenon; 2
During construction, effective measures shall be taken to prevent rainwater or soil and other garbage from penetrating into the expansion joint to cause obstruction S3
During construction, future installation, inspection, maintenance and cleaning shall be considered to make the later work convenient and feasible; 4 where expansion joints are set, the bridge railing and the pavement facilities of the bridge deck must be disconnected Highway bridge expansion joint construction 1 the main problem of highway bridge expansion joint construction is the quality of the expansion joint itself
The inaccurate material selection and design defects lead to the frequent occurrence of deformation, damage and falling off of the expansion joint after being used for a period of time
The second is the installation of the expansion joint
On the premise that there is no quality problem in the expansion joint itself, the difference between its elevation and the road height on both sides during the installation of the expansion joint leads to the jumping at the interface of the expansion joint
Third, the material of the mud concrete itself
In the process of installing the expansion joint, the mud concrete needs to be used to fix the expansion joint
The quality problems or different degrees of damage of the concrete fixing the expansion joint will affect the quality of the expansion joint
2 construction requirements 2
1 before the construction of the expansion joint, submit a detailed construction organization design scheme, which requires careful organization, overall arrangement and strict control in accordance with the construction specifications
2
2 establish a professional construction operation group, including joint cutting group, slotting group, installation group and concrete pouring group, clarify the tasks and clarify the responsibilities
2
3 the resident supervisor shall carefully inspect the construction of each process such as joint cutting, grooving, profile steel installation and concrete pouring, and enter the next process after passing the acceptance
At the same time, the important processes such as profile steel installation and concrete pouring shall be on-site in the whole process
2
4 make preparations before construction, including getting familiar with drawings, installation operation procedures J and training in construction operation procedures; Check the position number of the expansion joint
J check and accept the straightness, flatness, twist direction and spacing of the expansion joint
The mechanical equipment shall be complete
All small machines and tools, especially the engine, must be in place
At the same time, ensure that there is one for standby to ensure the smooth progress of construction
Reasonably select the mixing station and the transportation of mud and concrete, and the mud and concrete shall be used
Steel fiber reinforced high-strength concrete is prone to segregation during long-distance transportation
Try to ensure the location of the mixing station to minimize the transportation distance
I equip various colored strips, geotextiles, steel plates or canvas to prevent pavement pollution
Make construction warning signs, strengthen traffic control and ensure construction quality
3 construction process the construction process is basically the same
The seemingly simple six steps of cutting joints, slotting, installation, pouring, curing and installing rubber strips
But every step is very important
Only by controlling each step, the quality of the expansion joint can be more perfect