Construction method of prestress recoverable type anti-seismic anchor rod for slope support

A prestressing and bolting technology, which is applied in excavation, infrastructure engineering, construction, etc., can solve the problems of bolt prestress loss, slope support system damage, bolt stress surge, etc., to avoid shear damage, The effect of protecting the anchor rod and excellent seismic performance

Active Publication Date: 2022-03-04
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Earthquakes are one of the main causes of landslides. Traditional anchors do not have any anti-seismic measures, which often leads to damage and failure of the slope support system under the action of earthquakes, resulting in landslides and serious consequences.
The main problems of the traditional bolt are as follows: 1. Under the earthquake, the stress of the bolt increases sharply, the bolt body is broken, the anchor body is pulled out, or the bolt shakes along the slope and shear damage occurs; 2. The bolt is pre-stressed. Improper stress tension causes uneven stress on different rods. Under earthquake action, the stress of a certain rod increases suddenly, breaking or debonding from the anchor, reducing the ultimate bearing capacity of the anchor; 3. Affected by anchor creep or earthquake Affected, the prestress of the anchor will be lost and cannot be restored, thereby reducing the safety factor of slope stability and increasing the risk of landslides

Method used

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  • Construction method of prestress recoverable type anti-seismic anchor rod for slope support
  • Construction method of prestress recoverable type anti-seismic anchor rod for slope support
  • Construction method of prestress recoverable type anti-seismic anchor rod for slope support

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Effect test

Embodiment 1

[0043] Such as Figure 1-6 , 8-10, a construction method for a prestressed recoverable seismic anchor for slope support, the prestressed recoverable seismic anchor includes an anchor section 1, a free section 2 and an anchor head 3 . The anchor head 3 includes a backing plate 4 , an anti-seismic device 5 located on the backing plate 4 , a prestressing device 6 , an anchor 7 and a protective shell 8 .

[0044]The anti-seismic device 5 comprises a self-aligning roller bearing a51, an arc-shaped claw 52 and a spherical base 53, several arc-shaped claws 52 are evenly distributed on the outer edge of the spherical roller bearing a51, and the inner side of the arc-shaped claw 52 is connected to the The self-aligning roller bearing a51 is fixedly connected, and the spherical base 53 is composed of several arc-shaped steel strips 531, and the top of each arc-shaped steel strip 531 is fixedly connected with the outside of an arc-shaped claw 52. The spherical roller bearing a51 is a h...

Embodiment 2

[0066] The construction method of the prestressed recoverable anti-seismic anchor is the same as in Example 1. Further, the number of the rod bodies 9 is 3, but in step 6, when the anchor is synchronously tensioned and locked, due to the influence of the construction process or construction quality , there is a small difference in the prestress tension value of each rod body 9 or the prestress loss when locking, resulting in an unbalanced prestressed force on each rod body 9, such as Figure 7 As shown, when the prestressed rod body 9 is unbalanced, the anchorage 7 flips slightly, and one end of the larger prestressed rod body 9 sinks to realize partial prestress release, while the end of the smaller prestressed rod body 9 rises, which is equivalent to applying Part of the prestress is achieved, and when the prestress of each rod body 9 is the same, the anchorage 7 will no longer turn over and reach a new mechanical equilibrium state. Because the inner edge of the anchorage 7 ...

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Abstract

The invention discloses a construction method of a prestress recoverable type anti-seismic anchor rod for slope supporting. The anchor rod structurally comprises an anchoring section, a free section and an anchor head. The anchor head comprises a base plate, an anti-seismic device, a prestress applying device and an anchorage device. The slope supporting method comprises the following six steps: 1, drilling holes; 2, loading an anchor; 3, grouting maintenance; 4, retaining wall construction; 5, mounting an anchor head; and 6, tensioning and locking. The prestress recovery comprises the following steps: 1, unsealing; 2, applying prestress; the problems that in slope supporting, under the earthquake action, the anchor rod is prone to being damaged, stress of the anchor rod body is uneven, and prestress loss cannot be recovered are effectively solved. According to the construction method of the anti-seismic anchor rod for slope supporting, the anti-seismic performance is excellent, the stress of the rod body can be automatically adjusted, the prestress of the anchor rod can be recovered in a lossless mode, and the construction method has wide application prospects and remarkable economic and social benefits.

Description

technical field [0001] The invention belongs to the technical field of slope reinforcement, and relates to a construction method of a prestressed recoverable anti-seismic bolt used for slope support, in particular to a slope support method and a prestress restoration method. Background technique [0002] The composite support system composed of anchor rod and slope retaining wall structure (lattice beam, concrete surface, etc.) is a common technology for slope reinforcement. Anchor rods can provide the required anchoring force for the support system, which can effectively improve the slope's anti-sliding resistance, increase the safety factor of slope stability, and ensure the safety and stability of the slope. [0003] Earthquakes are one of the main causes of landslides. Traditional bolts do not have any anti-seismic measures, which often leads to damage and failure of the slope support system under the action of earthquakes, resulting in landslides and serious consequence...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/20E02D5/74E02D27/34
CPCE02D17/20E02D5/74E02D27/34E02D2250/0046E02D2600/30
Inventor 高幸贾金青梅国雄包小华张丽华
Owner DALIAN UNIV OF TECH
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