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Device and method for pulling out pre-buried steel pipe in post-tensioning prestressed concrete construction

A concrete and prestressed technology, which is applied in the processing of building materials, construction, building construction, etc., can solve the problems of easy hole collapse and labor-intensive problems

Active Publication Date: 2017-10-20
HENAN QIANKUN ROAD & BRIDGE ENG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is labor-intensive and prone to hole collapse

Method used

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  • Device and method for pulling out pre-buried steel pipe in post-tensioning prestressed concrete construction

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Embodiment Construction

[0006] The specific embodiment of the present invention is described below in conjunction with accompanying drawing

[0007] see figure 1 Firstly, according to the conventional method of post-tensioning prestressed concrete construction, prestressed core-pulling steel pipes are buried in the formwork, and the concrete is poured. Connect the two ends of the steel pipe 1, then turn on the power supply of the electric heating device 2, quickly heat the steel pipe 1 with low voltage and high current, cut off the power supply after the steel pipe 1 is heated to a certain degree, remove the positive and negative wires, and quickly pass the steel pipe 1 through Cool the steel pipe 1 with cold water, the cooled steel pipe 1 will be disengaged from the concrete hole, and the steel pipe can be pulled out.

[0008] Note: Before the steel pipe 1 is pre-embedded in the formwork, it is still necessary to apply a release agent according to the conventional method to prevent the steel pipe 1...

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Abstract

The invention provides an embedded steel pipe pull-out device and method during post-tensioning method prestressed concrete construction. The embedded steel pipe pull-out device and method are mainly used for pulling out embedded steel pipes during post-tensioning method prestressed concrete construction in the architectural engineering field. The embedded steel pipe pull-out device is mainly composed of electrical heating equipment (2), a positive wire (3) and a negative wire (4). The positive wire and the negative wire are connected with a positive electrode and a negative electrode of the electrical heating equipment (2) correspondingly, and the other end of the positive wire and the other end of the negative wire are connected with the two ends of a steel pipe (1) correspondingly. The construction method comprises the steps that pipe pulling operation is started after concrete is subjected to final setting and reaches a certain strength; a switch of the electrical heating equipment (2) is turned on during pipe pulling; the steel pipe (1) is rapidly heated through a large-current low-voltage electric current; then the switch of the electrical heating equipment (2) is turned off, the steel pipe (1) is rapidly cooled through cold water in the steel pipe (1), and the steel pipe (1) is disengaged from a concrete hole in the concrete under the condition of heat expansion and cold contraction; and the steel pipe (1) is pulled out finally, and pipe pulling is completed.

Description

technical field [0001] The invention is mainly used for pulling out pre-embedded steel pipes in post-tensioned prestressed concrete construction in the field of construction engineering. Background technique [0002] At present, the method of pulling out the pre-embedded steel pipe in the construction of post-tensioned prestressed concrete in my country is to continuously rotate the steel pipe during the time between the initial setting of the concrete and the final setting. Pull out the steel pipe. This method is labor-intensive and prone to hole collapse. Contents of the invention [0003] The present invention overcomes the above-mentioned phenomenon, and it is mainly composed of an electric heating device (2), a positive lead wire (3), and a negative lead wire (4); one end of the positive lead wire (3) is connected with the positive pole of the electric heating device (2), and the other end is connected with One end of the steel pipe (1) is connected, one end of the n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04G21/12
CPCE04G21/12
Inventor 彭宝安
Owner HENAN QIANKUN ROAD & BRIDGE ENG CO LTD
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