Finished product prestress steel strand

Abstract

The invention relates to a finished product prestress steel strand which comprises at least two prestress rib penetrating devices, prestress ribs in the number the same as the prestress rib penetrating devices and at least two marking plates. Each marking plate is provided with perforation holes matched with the prestress rib penetrating devices in quantity and diameter, one end of each prestress rib penetrates through one perforation hole of one marking plate and is fixed into the corresponding prestress rib penetrating device, and the other end of the corresponding prestress rib penetrates through the perforation hole, at the same position as the preceding perforation hole, of the other marking plate. The finished product prestress steel strand is simple in structure, convenient to operate, low in cost and high in strength, can clamp and fix the prestress ribs, achieves efficient penetrating with the help of the marking plates at the two ends of the steel strand, guarantees that the whole bundle of prestress ribs can be arranged in order one by one in the penetrating process and cannot distort or intertwine, hidden risks of a tension function are reduced, the series size of the penetrating devices meet construction requirements for different quantities of prestress ribs and diverse structures.

Description

technical field [0001] The invention relates to a civil engineering bridge construction equipment, in particular to a finished prestressed steel strand bundle with a traction device. Background technique [0002] The so-called prestressed concrete structure is to artificially apply pressure to the structural members before they are subjected to external loads, and the resulting prestressed state is used to reduce or offset the tensile stress caused by external loads, that is, by means of concrete The higher compressive strength can make up for the lack of tensile strength, so as to delay the cracking of concrete in the tension area. The structure made of prestressed concrete usually adopts the method of tensioning steel bars to achieve the purpose of precompression stress, so it is also called prestressed reinforced concrete structure. In the construction process of railway and highway bridges, various continuous beams, continuous rigid frames and continuous beam arches and...

AI Technical Summary

Problems solved by technology

[0003] Specifically, the manufacturing process of prestressed concrete structures usually includes the following steps. First, bundle the steel strands; secondly, pull the bundled steel strands into the bellows for use; then, carry out Concrete pouring; finally, the tensioning operation of the prestressed tendons is carried out. After tensioning, the anchors can be locked; according to the actual construction needs, the prestressed tendons may be woven into a bundle of 4-24, and the length of each bundle is about About 80-120 meters, the total weight can reach 5-7 tons; due to the large number and weight of prestressed tendons, it is usually completed with the help of external equipment such as winch and beam threading machine in the process of threading. Low efficiency and time-consuming and labor-intensive; the connection between the end of the prestressed tendon and the above-mentioned external equipment must be very firm, so that sufficient traction can be transmitted to the prestressed tendon during the beam passing process, so that it can pass through the bellows smoothly; in addition, Because the existing beam threading method usually puts each of the whole bundle of prestressed tendons into the bellows one by one, each prestressed tendon is easily twisted and entangled with each other during the process of penetrating into the bellows. Hidden dangers remain in subsequent tensioning operations, seriously affecting the quality of prestressed reinforced concrete structures

Images