Method for replacing hogging moment prestressed tendons of T-shaped beams by artfully using jack
A prestressed beam and jack technology is applied in the field of replacing the negative bending moment prestressed beam of a T beam with a jack, which can solve the problems of large damage to reinforced concrete, and achieve the effects of low manufacturing cost, simple and compact structure, and widespread promotion significance.
Inactive Publication Date: 2016-04-27
CHINA RAILWAY SHISIJU GROUP CORP
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Problems solved by technology
The traditional T-beam negative bending moment prestressed beam replacement construction is constructed by longitudinal slotting method, which causes great damage to the reinforced concrete of the beam body
Method used
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Embodiment Construction
[0008] Use the jack skillfully to replace the negative bending moment prestressed beam of the T-beam, such as figure 1 , figure 2 , image 3 and Figure 4 As shown in the figure, the construction workers used picks to remove the concrete on the surface of the continuous section of the pier top until the corrugated pipes were exposed, then cut the corrugated pipes with a blade, checked the damage of the prestressed steel strands, and marked them.
[0009] In order to further realize the purpose of the present invention, the following technical solutions can also be adopted: under the premise of safety protection, the construction workers step on the working platform and remove the clips and anchors at the end of the tooth block at the bottom of the beam that has been marked for replacement. Tool. After the clips and anchors are removed, the steel strands are cut off at the top of the continuous section of the pier top and tensioned, and safety protection measures are taken ...
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The invention provides a method for replacing hogging moment prestressed tendons of T-shaped beams by artfully using a jack. Constructors use pneumatic picks to chisel off concrete on the surfaces of continuous sections at the tops of piers until corrugated pipes are exposed, and then the constructors use blades to cut the corrugated pipes so as to check the damaged conditions of prestressed steel strands and make marks. By using the jack for replacing the hogging moment prestressed tendons of the T-shaped beams, the construction is convenient and fast, the manpower and material resources are saved, the construction period is shortened, and the damage to beam bodies is greatly reduced. Therefore, the method has wide popularization significance in the aspects of maintenance and removal of old bridges. The method provided by the invention also has the advantages of simple and compact structure, low manufacturing cost and simplicity and convenience in use.
Description
technical field [0001] The invention relates to a T beam negative bending moment prestressed bundle, in particular to a T beam negative bending moment prestressed bundle replaced by a jack skillfully. Background technique [0002] During the regular inspection of the bridge, it was detected that the negative bending moment prestress of the T-beam was severely damaged. The owner arranged for our unit to start maintenance work immediately, and required that the conditions for opening to traffic must be met before October 1. Due to the tight construction schedule and heavy tasks, the group company issued an order to dispatch experienced personnel from the project department of the company in Sichuan and Chongqing to temporarily form an assistance team to repair the old bridge. The traditional T-beam negative moment prestressed beam replacement construction is constructed by longitudinal slotting method, which causes great damage to the reinforced concrete of the beam body. It ...
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Inventor 徐刚
Owner CHINA RAILWAY SHISIJU GROUP CORP