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Rubber pulling rod device of prestressed pore channel of forming band bealock

A rubber rod and prestressing technology, applied in the processing of building materials, structural elements, building components, etc., can solve the discharge of unfavorable bleeding, cannot ensure that the prestressed tendon grouting material is completely dense, and affects the durability of the prestressed system, etc. problem, to achieve the effect of good bonding performance

Inactive Publication Date: 2012-07-11
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, through a large number of tests and on-site broken beams, it was found that the grouting materials around the prestressed tendons cannot be guaranteed to be completely dense by using these methods, resulting in the inconsistency of the grouting inside the tunnel, which seriously affects the durability of the prestressed system.
[0003] The shape of the traditional prestressed holes formed by rubber rods is mostly round holes or flat holes. These shaped holes are not conducive to the discharge of bleeding water, resulting in insufficient grouting inside the holes, which seriously affects the durability of the prestressed system. sex

Method used

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  • Rubber pulling rod device of prestressed pore channel of forming band bealock
  • Rubber pulling rod device of prestressed pore channel of forming band bealock
  • Rubber pulling rod device of prestressed pore channel of forming band bealock

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of rubber drawing rod device with pre-stressed channel with a pass, see figure 1 , 2 The rubber extraction rod device includes: a rubber rod 1 at the upper part of the pass and a rubber rod 2 at the lower part of the pass. The protrusions of the trapezoidal section at the bottom of the upper rubber rod 1 of the pass are inserted into the concave grooves of the lower rubber rod 2 of the pass.

[0022] The cross-sectional shape of the rubber rod 1 at the upper part of the pass is an irregular ellipse with a protrusion at the bottom, see

[0023] Figure 4 The cross-sectional shape of the rubber rod 2 at the lower part of the pass is elliptical, and there is a groove at its short axis. The upper opening L of the concave groove of the rubber rod 2 at the lower part of the pass is 5mm, and the bottom end surface L1 of the concave groove is 4mm, see image 3 .

[0024] The distance H between the convex end surface of the trapezoidal section of the bottom rubber rod 1 of the u...

Embodiment 2

[0029] The difference from the first embodiment is:

[0030] The number of prestressed tendons is 9 and the area of ​​the prestressed tendons is 1485mm 2 , According to the principle that the area of ​​the prestressed tendons occupies 1 / 3 to 2 / 3 of the area of ​​the prestressed tunnel in the lower part of the pass, the cross-sectional area of ​​the rubber rod 2 at the lower part of the pass is determined. Take the length of the short axis of the rubber rod 2 at the lower part of the pass is 60mm, the length of the long axis is 80mm, and its area is 3769.91mm 2 . The area of ​​the rubber rod 1 on the upper part of the pass is 188.50mm 2 The ratio of the cavity surface area of ​​the upper channel of the pass to the cavity surface area of ​​the lower channel of the pass is 5%.

Embodiment 3

[0032] The difference from the first embodiment is:

[0033] The number of prestressed tendons is 9 and the area of ​​the prestressed tendons is 1485mm 2 , According to the principle that the area of ​​the prestressed tendons occupies 1 / 3 to 2 / 3 of the area of ​​the prestressed tunnel in the lower part of the pass, the cross-sectional area of ​​the rubber rod 2 at the lower part of the pass is determined. Take the length of the short axis of the rubber rod 2 at the lower part of the pass is 60mm, the length of the long axis is 80mm, and its area is 3769.91mm 2 . The area of ​​the rubber rod 1 on the upper part of the pass is 753.98mm 2 The ratio of the cavity surface area of ​​the upper channel of the pass to the cavity surface area of ​​the lower channel of the pass is 20%.

[0034] when using it:

[0035] 1. Bind the rubber extraction rod device with the pre-stressed tunnel with a passway to the position required by the steel frame of the concrete member according to the design re...

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Abstract

The invention relates to a rubber pulling rod device of a prestressed pore channel of a forming band bealock, in particular to a forming device of a prestressed pore channel. The rubber pulling rod device comprises an upper rubber rod (1) of a bealock and a lower rubber rod (2) of the bealock, wherein a bulge of the bottom trapezoid cross section of the upper rubber rod (1) of the bealock is embedded into a groove of the lower rubber rod (2) of the bealock, the cross section of the upper rubber rod (1) of the bealock is in an irregular oblong shape, the bottom of the cross section is providedwith a bulge, the cross section of the lower rubber rod (2) of the bealock is in an oblong shape, a short shaft of the cross section of the lower rubber rod (2) is provided with a groove, and the proportion of the area of the upper rubber rod (1) of the bealock to the area of the lower rubber rod (1) of the bealock is 5-20 percent. The rubber pulling rod device solves the problems that the traditional circular or flat prestressed pore channel which is formed by a rubber pulling rod is not beneficial to discharging bleeding to cause the leakiness of the internal grout injection of the pore channel.

Description

Technical field [0001] The invention relates to a prestressed tunnel forming equipment, in particular to a composite section with a pass which is different from the traditional single round section rubber extraction rod in the grouting construction of the post-tensioned prestressed concrete tunnel. The rubber extraction rod device is used to form the pre-stressed tunnel with a pass. Background technique [0002] In the construction of post-tensioned prestressed concrete in the civil engineering industry, cement-based grouting materials are generally used for grouting the prestressed tendons after tension. Its function is to protect the durability of the prestressed tendons and increase the bonding force with the concrete. After the pre-stressed tendon is stretched, the pre-stressed tendon is located at the top of the pre-stressed tunnel due to the tensile force. After the prestressed duct is grouted, the cement slurry with a larger specific gravity will be located at the bottom...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04G21/12E04C5/10
Inventor 朱尔玉李学民周勇政张敏千朱力程曦赵越杨金诚王燕珍
Owner BEIJING JIAOTONG UNIV