Demolding jacking system for pre-tensioning method prestressed concrete track board production line and application thereof

Abstract

The invention belongs to a demolding device, and in particular relates to a demolding jacking system for a pre-tensioning method prestressed concrete track board production line and an application thereof. The demolding jacking system comprises a control device, a locking mechanism, jacking mechanisms and a precise positioning mechanism, wherein the control device receiving collected signals in mold moving and mechanism working processes controls actions of the mechanisms; the jacking mechanisms are arranged on the inner side of the locking mechanism and are symmetrically distributed along thecenter line of a mold to form a rectangular supporting face concentric to the center of a track board for the track board in the mold; each of the jacking mechanisms comprises a jacking jack which isfixed to a base and corresponds to the lower end of a demolding jacking column in the mold, and a displacement sensor and a hydraulic sensor are separately arranged on the jacking jack and a hydraulic loop thereof. The demolding jacking system provided by the invention solves the technical problems that the technical demands of existing standards are unlikely to meet in the prior art, the productquality is hard to guarantee and the like effectively, and has the advantages of meeting the existing standard demands better, being compact in structural layout, high in demolding success rate, easyto implement automatic control and the like.

Description

technical field [0001] The invention belongs to a demoulding device, in particular to a demoulding jacking system for a pretensioned prestressed concrete track slab production line and an application thereof. Background technique [0002] With the rapid development of China's high-speed railway construction, the manufacturing and production of track slabs has gone through various forms such as CRTS-Ⅰ, Ⅱ, and Ⅲ. At present, the slab ballastless track CRTSⅢ pretensioned track slab is used in the industry. The production of track slabs of any specification needs to go through many processes, including the demoulding process of track slabs. The production of the track slab is based on the mold, and the track slab is formed by pouring concrete in the mold cavity of the preset steel cage and prestressed tendon after shaping and curing, and the track slab after curing is removed from the track slab mold through the demoulding process Complete the production process of track slabs....

AI Technical Summary

Problems solved by technology

[0003] 1. The existing demoulding process is to use manual shaking jacks in time when the concrete is finally set and reaches the strength of demoulding, and is placed on the corresponding brackets at four points on both sides of the mold side form, and is balanced by manpower, such as pressing, shaking, prying, etc. Demoulding is not only labor-intensive and time-consuming, but also easily damages the mold; at the same time, due to the asynchronous human operation, the shape of the track plate is prone to pitting, peeling, corner loss, and even cracks, which seriously affects the molding quality of the track plate

[0004] 2. The existing demoulding process usually requires the opening and closing of the end and side molds of the mold or the overall disassembly and lifting of the same plate, resulting in the need to readjust and close the mold every time the plate is made

Due to the high requirements on the shape, size, surface parameters, internal reinforcement layout and other conditions of the track slab in the production process of the track slab, it is difficult to ensure the consistency of the mold installation accuracy every time the mold is disassembled and closed

At the same time, dismantling and closing the mold will cause a great waste of manpower, material resources and time for construction. Due to the high requirements for installation accuracy, the quality of construction personnel, construction site space and facilities are high.

[0005] 3. Most of the existing complete sets of demoulding equipment are large in size and troublesome to use. Many equipment need to be transported repeatedly with the help of external lifting equipment; some so-called small automatic demoulding equipment has a low degree of automation and requires multiple people to repeatedly Disassembly, alignment and other issues, it is difficult to get a good use in practice

[0015] Since the technical scheme completes the jacking operation through the three grouting hole cavities preset in the track plate mold, since the grouting holes are distributed in a straight line on the mold, the jacking force point is linear, and the track plate size and self-weight are relatively large. One is that it is difficult to meet the technical requirements of the current standard that the track plate should be evenly stressed during the demoulding process. The track plate is prone to unstable demoulding process due to uneven force, and in severe cases, it will cause jamming with the mold or failure to demould The second is that the grouting hole cavity is fixed with the track plate mold by screws during board making. The grouting hole cavity needs to be loosened every time the jacking and demoulding operation is completed. After the demoulding is completed, the grouting hole cavity must be reinstalled Fixing and mold cavity, the operation process is complicated and the degree of automation is low

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