How to calculate the expansion joint of the bridge, how to calculate the expansion joint

The length of the expansion joint, the height of the façade, is the height of the expansion joint to be set in the building, such as the expansion joint on the wall, and the length of the plane is the length of the expansion joint to be set in the building, such as the expansion joint on the roof.

Expansion joints are usually provided between the two beam ends, between the beam ends and the abutment, or at the hinged position of the bridge. It is required that the expansion joints can be freely expanded and contracted in two directions parallel to and perpendicular to the axis of the bridge, firm and reliable, and the vehicle should be smooth and free of sudden jump and noise when the vehicle is outdated. In order to prevent rainwater and garbage from seeping into the blockage, installation, inspection, maintenance, and removal of dirt should be simple and convenient.

At the place where the expansion joint is set, the railing and the bridge deck pavement should be disconnected.

Precautions for expansion joint construction.

Waterstop for roof expansion joints: treatment of the position, angle and sag of the waterstop. Apply the base glue on both sides of the base surface and the waterstop, and wait until it is dry to non-sticky after bonding, flattening and compacting, the two waterstops are connected by lap glue butt, and the joint length is about 8cm.

Brush the base glue on the joint part of the waterstop, and when it dries to the point that it does not stick to your hands, it is attached, flattened, and compacted. The waterstop of the roof expansion joint must be installed with drainage.

Install the slide rod and cover plate: preliminarily fix the slide rod to the part to be installed, screw the slide rod screw, align both sides of the cover plate joint, glue and paste the stainless steel seal at the cover plate joint, and smooth both sides with glue.

The engineering quantity of expansion joints is calculated by extending meters (m), such as internal and external double-sided caulking, and the engineering quantity is calculated on both sides. Expansion joints are suitable for roof, wall and floor sections.

The expansion joint is generally calculated according to the length, because the quota has been set according to the width of the expansion joint in the quota, so only the length needs to be calculated when calculating, and then the quota of the corresponding width expansion joint is applied.

PS: Expansion joint refers to a structural joint set up at an appropriate part along the direction of the construction joint of the building or structure in order to prevent cracks or damage to the structure due to climate and temperature changes (thermal expansion and cold contraction). Expansion joints are to divide the building components above the foundation, such as walls, floors, roofs (except wooden roofs), into two independent parts, so that the building or structure can be expanded horizontally along the long direction.

1. Combined with the daily maintenance work of highway bridges, often clean up the sediment, stone chips and other debris accumulated in the sealed rubber belt. Prevent the free expansion and contraction of the expansion device when it is stressed, and the sealing rubber belt will be punctured by large stones and other objects, resulting in water leakage and sand leakage, etc., once it is found that there is damage, the tape should be replaced in time.

2. Frequently check whether there is damage, cracks and leakage at the connection between the side beam and the bridge deck pavement, and repair it in time once found, so as not to affect the anchorage strength between the expansion device and the beam and the plate.

3. Always check whether the top surface of the telescopic device is flat, if there is abnormal unevenness, it should be further checked whether the sliding pressure bearing or sliding compression bearing is damaged, and if it is damaged, it should be replaced in time. For the MCL type telescopic device, the convenience of parts replacement has been fully considered in the design, and it has been proved to be completely feasible through experiments.

4. In the daily maintenance, when it is found that there is too much uneven displacement between the joints of the expansion device, the displacement control system components can be checked in time to see whether they are damaged, and if they are found to be damaged, they should also be replaced in time. The unit uses standard components and is easy to replace.

5. The modular telescopic device belongs to the steel structure, although it has undergone good protection treatment before leaving the factory, but due to the harsh environment of use, after a certain period of use, it is normal to produce general corrosion, and then the maintenance department should regularly re-carry out anti-rust treatment to ensure the normal use of the telescopic device and good durability.

Product features of D60, D80, F60, F80 bridge expansion joints:

1. The standard displacement of expansion joints for highway bridges: 0-80 (mm) horizontally, 15mm vertically, and flexible telescopic.

2. Shallow pre-anchoring system is adopted, and the thickness of the beam end (including the pavement layer) only needs to exceed 240mm. (The thickness of the D-80 FD-80 model is 200mm).

3. The size of the F-shaped steel cavity is stable, and the tape is closely attached to the cavity, which has reliable sealing performance.

4. Long service life, under normal maintenance, it can achieve the effect of equal life with bridges.

5. The cost of the expansion joint product is low and the installation is convenient.

For the fragile parts of the bridge, special attention should be paid to the installation quality.

1) The reserved groove of the expansion joint should be straight, and its width and the embedded reinforcement should meet the design requirements. Special attention should be paid to the pre-embedding of the expansion joint reinforcement of the back wall of the abutment, which is often leaked during construction.

2) Temporary landfill should be carried out before paving asphalt concrete to ensure that the heavy truck is not loose and can adapt to a certain expansion and contraction.

3) The installation should be carried out by the professional team of the manufacturer. After slotting, check whether the width of the reserved groove meets the requirements, and if the section steel has the possibility of emptying, it should be replaced with a wider model. After the section steel is in place, it is necessary to carry out inspection and acceptance, including the positioning of the section steel, the welding of the steel bar, etc., and the concrete can be poured only after it is qualified.

Attention should be paid to the strength of concrete, the amount of steel fibers, etc., after the completion of the first comprehensive inspection before the formal construction.

The design code of the bridge expansion joint requires that the operation be carried out according to the instruction manual of the thing, and if it is unclear, you can find relevant personnel to explore and study it to solve it from the root.

Bridge expansion joint: In order to meet the requirements of bridge deck deformation, expansion joints are usually set between two beam ends, between beam ends and abutments, or at the hinged position of the bridge.

Bridge expansion joints are one of the important considerations in the design of bridge structures. The function of the expansion joint is to maintain the strength and stability of the bridge, while allowing the bridge to expand and contract slightly with the change of temperature, so as to prevent damage to the bridge structure caused by temperature change. Therefore, it is very important to determine the number of expansion joints in the bridge.

When designing a bridge expansion joint, it is first necessary to determine factors such as the length of the bridge, the temperature range, and the conditions of use. In general, for shorter bridges, it is usually only necessary to set up an expansion joint. For longer bridges, multiple expansion joints are required to ensure the stability and strength of the bridge.

In the actual construction process, it is also necessary to consider the reasonable collocation of factors such as the plate thickness and plate strength of the bridge expansion joint. The reasonable design of these factors can ensure that the structure of the bridge is tighter and stronger, and improve the service life and safety of the bridge.

In conclusion, the calculation of the number of expansion joints in a bridge needs to consider several factors. Reasonable design can ensure the safety and service life of the bridge, and prevent structural damage and danger. Therefore, the determination of the number of expansion joints is a very critical step when carrying out bridge design.

The number of expansion joints in a bridge is determined according to the size and design of the bridge. Expansion joint refers to the device used in the bridge to deal with the expansion and deformation problems caused by thermal expansion and cold contraction, ** and wind and other factors. They are usually some gaps that connect different parts of the bridge so that the bridge can move horizontally or vertically in some cases without causing damage.

Therefore, expansion joints play a vital role in maintaining the integrity of the bridge.

The number of expansion joints in a bridge is influenced and considered by factors such as bridge length, temperature changes, climatic conditions, horizontal and vertical movement, etc. Smaller bridges typically require only a few expansion joints, while larger bridges may require hundreds. In addition, some bridge leaks may require more than one type of expansion joint.

Therefore, the size and design of the bridge are important factors to ensure that the number of expansion joints required is correctly estimated.

In addition, with advances in technology and engineering, the design and construction of bridges have become more sophisticated and complex. The use of new materials, new technologies, and new design methods can reduce or increase the number of expansion joints without sacrificing the safety and integrity of the bridge. As a result, the number of expansion joints in bridges can change as new technologies and materials continue to be introduced.

In conclusion, the number of expansion joints in bridges is a combination of factors and plays a vital role in bridge design and construction. Accurately estimating the number of expansion joints can ensure the integrity and safety of the bridge, and ensure that the bridge can operate smoothly in various climatic conditions, providing important help for people's lives and economic development. <>

The construction technology of bridge expansion joints is very important, and the technical performance of the process is very good to solve some practical problems and achieve the best construction effect. Zhongda Consulting will talk to you about the construction process of bridge expansion joints.

1) Clean the reserved groove 1, first clean the surface layer, after the surface layer is cleared, use manual cleaning of the seam area.

2. After cleaning up, the concrete surface in the trough area is chiseled and teased, and the role of this process increases the bonding of new and old concrete.

2) Determine the width of the installation gap 1, and plant and supplement the parts without embedded reinforcement according to the actual situation of the site.

3) Positioning and installation.

1. Due to long-distance transportation, the expansion joint may be deformed to a certain extent, and must be straightened during installation;

2. Before the expansion joint is installed in place, adjust the original reserved steel bar;

3. After the section steel is in place, spot welding is used for positioning, and then the cloth is welded one by one;

4. steel bar binding;

The 6cm foam board stuffs the middle of the steel joint and the original reserved joint to prevent the leakage of slurry when pouring concrete, which affects the expansion and contraction of the bridge.

4) Concrete pouring mixed with C50 steel fiber concrete steel fiber.

1. Concrete pouring is vibrated with a plug-in vibrating pump;

2. Test block production;

3. Rainproof measures should be taken in advance when the weather changes when the concrete is poured;

4. The maintenance is covered with plastic film.