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Device and method for compensating or unloading prestressed load of anchor cable

A technology of prestressing and anchoring cables, which is used in earth-moving drilling, installation of anchor rods, sheet pile walls, etc., can solve the problems of low reliability, weak bolt locking force, and unsatisfactory effects, and achieve the effect of ensuring the effect.

Inactive Publication Date: 2011-12-28
中铁西北科学研究院有限公司深圳南方分院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The projects reinforced with prestressed anchor cables are generally projects with high safety requirements, such as dams, large-scale landslides, high and steep slopes, underground caverns, mine roadways, deep foundation pits, etc. If the destruction occurs, it will cause immeasurable huge damage to the property safety of the people.
[0004] At present, it is a relatively mature technology to regularly detect and evaluate the prestress of anchor cables in anchorage projects. However, there are still gaps in the market for devices and technologies for prestress load compensation or unloading of anchor cables Or method can realize the load compensation or unloading to anchor cable prestress, and its effect is not ideal enough, as: the title of invention that the applicant applied for on July 10, 2007 is: the device that is used for existing anchoring engineering quality detection and the detection device mentioned in the method can also be used for compensating the tension of the anchor cable prestress, but the anchor limiting plate in this device is fixed on the anchor pier with bolts, and the locking force of the bolts is very weak and reliable. Low resistance, easy to loose from the anchor pier, needs further improvement

Method used

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  • Device and method for compensating or unloading prestressed load of anchor cable
  • Device and method for compensating or unloading prestressed load of anchor cable
  • Device and method for compensating or unloading prestressed load of anchor cable

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] For the anchoring project where the prestress is not properly applied during construction, the length of the steel strand at the exposed section of the anchor cable can meet the length required for tension during the acceptance check. unloading device.

[0029] Such as figure 1 As shown, the anchor cable prestressed load compensation or unloading device in this embodiment includes: a limiting plate 2 , a small jack 3 and a supporting cylinder 5 .

[0030] The limiting plate 2 is installed on the working anchor 12 of the existing anchoring project, and it is provided with a limiting hole 21 that just passes through the steel strand 14 of the exposed section of the anchor cable. When the anchor cable is stretched, the steel strand 14 can be Pass through the limiting hole 21 and extend, and the clip 13 on the working anchor 12 stays in the anchor hole of the working anchor 12 because it is blocked by the limiting plate 2 .

[0031] The small jack 3 is installed on the to...

Embodiment 2

[0038] Since most of the anchoring projects are completed and accepted, most of the steel strands exposed outside the working anchor for inspection are cut off, and the subsequent load compensation or unloading process cannot be implemented, which requires the use of an anchor cable to extend The device is used to connect long steel strands to meet the required length of tension.

[0039] combined reference figure 2 , image 3 , the anchor cable extension device 4 includes: a first tool anchor 41 , a second tool anchor 42 and a connecting sleeve 43 .

[0040]The first tool anchor 41 is a cylindrical plate whose size and shape are basically the same as those of the working anchor 12 in the existing anchoring project, and is used to connect the exposed part of the steel strand 14 remaining outside the working anchor 12 in the existing anchoring project. The thickness of the first tool anchor 41 is slightly smaller than the length of the exposed part of the steel strand 14 rem...

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Abstract

A device and method for compensating or unloading the prestressed load of an anchor cable. For an anchoring project in which the length of the steel strand at the exposed section of the anchor cable meets the tension length, the device includes: a limiting plate, a small jack and a support tube. For the anchor cable For the anchoring project where the length of the steel strand at the exposed section does not meet the tension length, the anchor cable prestress load compensation or unloading device also includes an anchor cable extension device. Anchor cable prestress load compensation or unloading methods include: install anchor cable prestress load compensation or unloading device, install tension jack and tool anchor, insert tension tool anchor clip to tighten external steel strand; start tension The jack oil pump applies the load until the working anchor is pulled and the clip of the working anchor is loosened, continue to apply the load or unload to the specified load value, and then start the small jack to load and push back to the limit plate, the clip re-cables the steel strand, and then Unloading, to complete the anchor cable stress compensation or load reduction, so as to reliably ensure the load compensation or unloading effect of the anchor cable prestress.

Description

technical field [0001] The invention relates to a device and method for prestressed load compensation or unloading of anchor cables in anchoring engineering. Background technique [0002] Prestressed anchor cable (rod) reinforcement engineering has been widely used in geotechnical engineering (generally referred to as anchor engineering) such as dam reinforcement, landslide control, high and steep slope reinforcement, underground cavern reinforcement, and deep foundation pit reinforcement. Due to the use of prestressed anchor cable technology in these anchoring projects, a large prestress can be applied to the project to be reinforced in advance during the construction process of the structure to be reinforced and before delivery, so that the reinforced structure remains stable. Whether the anchor cable can provide long-term and stable prestress will directly determine the effect of anchoring rock and soil and the long-term stability and safety of the structure. [0003] Ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/74E21D20/00
Inventor 王建松
Owner 中铁西北科学研究院有限公司深圳南方分院
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