Construction methods for steel wire strands used in bridges?

First, install the prestressing duct. Use anchor plates, prestressed plastic corrugated pipes, etc., for the installation of the corrugated pipes, and determine the accurate position of the corrugated pipes during construction. The top surface of the box or the support platform serves as the steel wire cutting point. The second method is the single-end stretching method, using a four-wheel saw to cut the steel wire by root. The prestressing tendon anchor is fixed with a P-anchor to ensure the construction quality of the P-anchor. When the raw materials arrive on site, use a vernier caliper to perform dimensional matching tests, including checking the compression spring, compression head, and the complete steel strand after compression.

According to the P-anchor design drawings, fix the nominal position of the anchor anchor plate, completed by the root of the P-chain anchor and the pull anchor plate. The anchor end is fixed and the anchor end is formed.

Install the anchor ring. After the concrete pouring and maintenance are completed, start installing the anchor ring. The bridge steel wire strand manufacturer considers the completion standard. After the concrete reaches the design strength, install the jack and start the stretching construction. Then, carry out the prestressing tensioning construction. Afterwards, the last step is anchoring. The bridge steel wire strand manufacturer believes that after the prestressing construction is completed, the end cap transverse steel bar bundle should be sealed. This completes the prestressing steel wire strand of the entire bridge.

The bellows is a circular and flat bellows made by winding thin steel spirals. At present, prestressed concrete structures are increasingly used in construction, so the prestressed corrugated pipes for bridge steel wire strands are necessary for post-tensioned prestressed concrete structures.

The flat corrugated pipe is actually manufactured based on a circular corrugated pipe using a pressure pipe, and is usually used with 2, 3, 4, 5-hole flat working anchor plates.

The bridge steel wire strand manufacturer recommends that prestressed metal corrugated pipes be wound with steel strips. During the winding process, the mouth is tightened at the same time, the convex corrugated is pressed, etc. The products of this company have the characteristics of good universality, good interchangeability, reasonable formula, and convenient use.

a. Characteristics of prestressed metal corrugated pipes: lightweight, rigid, tight, and high adhesion resistance.

b. Applicable scope of prestressed metal corrugated pipes: prestressed metal corrugated pipes for post-tensioned prestressed reinforced concrete bridge beams; prestressed metal corrugated pipes for reinforced concrete hollow slabs; metal corrugated pipes for anchor bolt reserved holes; buildings, wall construction, basic pipe embedded pipes.

c. Product performance of prestressed metal corrugated pipes 1. Rigidity test: radial deformation 0.1 when the concentrated load is 0.75KN or the uniformly distributed load is 1.5KN

d. Water resistance test: water or cement slurry with a water-cement ratio of 0.5, no leakage for 30 minutes. Tensile test: axial tension 5KN pipe wall intact. 4. Tensile test: the tensile force buried in the concrete is more than 2.3 times the design tensile force of the anchor bolt.

Bending test: no leakage at a radius of curvature of 30d.

Generally speaking, a 2-hole flat working anchor plate corresponds to a 50*19 flat corrugated pipe, a 3-hole corresponds to a 60*19 flat corrugated pipe, a 4-hole corresponds to a 70*19 flat corrugated pipe, and a 5-hole corresponds to a 90*19 flat corrugated pipe. The prestressed hole system composed of plastic corrugated pipes and accessories must meet the needs of post-tensioned grouting. The bridge steel wire strand manufacturer believes that in addition to hot-welded connections, special sealed connection installations can also be provided between pipes and pipes. All hole-forming systems are equipped with exhaust, drainage, and discharge officers to meet the needs of pressure grouting or vacuum-assisted grouting.