Bridge expansion device

The modular expansion device is a new type of bridge expansion device that replaces the plate type and combined type. It has the characteristics of large displacement, flexible expansion and contraction, waterproof and dustproof, reasonable and firm structure, and convenient installation. It is a stereotyped product that is widely promoted at home and abroad.

· Divided into two types

Single group telescopic device

Multi-group telescopic device

1. Single group expansion joint

The single-group expansion joint is composed of two side beams, anchors and sealing rubber strips. The expansion displacement is 0-180mm. The main types are GQF-C type, XF type, RG type, SD type, SSFB type, QFM type, SF comb type etc.

main material

Steel side beams: hot-rolled 16Mn steel.

Sealing rubber: Imported chloroprene rubber is used for one-time molding through microwave vulcanization, which has good flex resistance, aging resistance, waterproof and dustproof performance.

Anchors: High-quality Q235 steel is used, which can firmly weld the expansion joints and the pre-embedded bars at the beam ends.

Anchor structure type

Expansion joint anchors mainly include anchor bolts, anchor rings, and anchor plates. Design engineers can choose according to the design thickness of the bridge deck. For special structural types, our company can customize and process according to design requirements. The table below shows the type of anchor software recommended by our company according to the size of the notch.

The steel and sealing strips usually used in single group joints are as follows:

1. GQF-C type:

This type of expansion joint has 40, 60, and 80 expansion options to choose from. It has the characteristics of low installation height, corrosion resistance, small vibration, and flexible expansion. It is especially suitable for new bridges with thin pavement and shallow installation notches. Or the renovation project of the old bridge.

2. XF-80 type:

The expansion joint has the characteristics of large bearing capacity, impact resistance, and strong combination with the beam body. It is not only suitable for new bridges, but also especially suitable for bridges with heavy traffic and heavy vehicles.

3. RG type

This type of expansion joint is commonly known as "Little Maole". In addition to the characteristics of small installation height, corrosion resistance, low vibration, and long service life, it can be firmly combined with the beam body and resist impact. It is especially suitable for urban overpasses, viaducts and old bridges. remodel.

4. SD type:

This type of expansion joint has 80, 100, and 125 expansion options to choose from. It not only has the characteristics of large bearing capacity, impact resistance, and firm combination with the bridge, but also its unique double-layer rubber strips, which not only has double Waterproof and dustproof function, and can self-discharge debris, especially suitable for use on urban viaducts and overpasses with heavy loads and high requirements for waterproof and dustproof.

5. SSFB-80 type

Due to the wide hem of the section steel, this type of expansion joint is particularly firm and reliable in combination with the beam body, so it can withstand large load impacts, and is especially suitable for bridges with heavy traffic and heavy vehicles.

6. QFM-80 type

This series of expansion joints is simple in structure; flexible in expansion and contraction; comfortable, safe and reliable to drive; easy to install; long in service life;

Two, multi-group expansion joints

Multiple groups of joints are composed of side beams, center beams, supporting formwork beams, displacement control boxes, pressure bearings, compression bearings, anchor components and sealing rubber strips. The displacement of each group is 0-80mm, according to the actual displacement of the bridge Quantity requirements to determine the number of groups, the current upper limit of displacement can reach 1200mm.

The main forms are: XF type oblique support type expansion joint, SSFB type straight support type expansion joint.

1. XF type oblique support telescopic device

Table-XF type large displacement modulus telescopic device reserved groove and pre-embedded reinforcement size

2. SSFB type vertical support telescopic device

3. SF comb-shaped steel plate bridge telescopic device

(1.) The SF telescopic device is mainly composed of comb-shaped steel plates, stainless steel slide plates, rubber waterproof layers, and high-strength anchor bolts.

(2.) Main features: waterproof, dustproof, and shockproof; suitable for bridges of various structures, with large expansion and contraction, and wide application range.