recyclable bolt

A bolt and hollow technology, which is applied in the field of recyclable bolts, can solve the technical defects of recyclable bolts, affect the secondary use, and the bolt cannot be recycled, etc., and achieve the convenience of anchoring construction and retraction construction, and the ultimate resistance Large pulling capacity and long service life

Active Publication Date: 2019-11-01
宁波中铭岩土工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] But still there is technical defect in above-mentioned a kind of recoverable bolt
In order to achieve the purpose of recovering the anchor rod, when the anchor rod of the above structure is supported in the foundation pit, the stress points of the anchor rod body are concentrated on the stretched upper and lower rods. During construction, the general pull-out bearing capacity of the anchor needs to reach hundreds of kilonewtons (KN), and some even require the pull-out bearing capacity to reach thousands of kN. ) under the pressure exerted by the soil wall, and the inner side does not apply a reverse force, it is easy to produce irreversible permanent deformation, which affects the secondary use, and even in the current use process, when the temporary support of the anchor After the protection function fails, the anchor cannot be recovered because the upper and lower rods of the anchor cannot be retracted.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Such as Figure 1-6 As shown, a kind of recoverable bolt provided in this embodiment comprises:

[0055] A hollow anchor rod 1, the hollow anchor rod 1 includes:

[0056] At least two first anchor sections 2, the first anchor sections 2 are arranged in a straight line, and the axes coincide, and one

[0057] The end of the first anchor section 2 on one side is provided with a reaming section 3, such as figure 2 and Figure 5 As shown, the outer wall of the reaming section 3 is provided with a first extension 4 that extends outwards and has a flange structure, and its inner wall is provided with a second extension 5 that extends inwards and forms a bayonet. The outer wall of the first anchor section 2 on one side is provided with a third extension part 6 extending outward and having a flange structure;

[0058] and, as image 3 and Figure 6 As shown, the hinged piece group located between every two adjacent first anchor rod segments 2, each hinged piece set inclu...

Embodiment 2

[0072] The general structure of the recoverable bolt provided in this embodiment is consistent with that of Embodiment 1, but, as Figure 10-13 As shown, in this embodiment, a raised portion 23 is provided on the inner wall of the second hinged piece 8 of each hinged piece group, and the raised portion 23 extends into the corresponding groove 24 on the center anchor rod 10, The protrusion 23 is provided with an opening rim 25 matching the groove 24 , and the protrusion 23 is driven away from the inclined guide surface 26 of the groove 24 under the thrust of the opening rim 25 .

[0073] When the hollow anchor 1 of the above-mentioned recoverable anchor begins to compress, synchronously, the opening edge 25 of each groove 24 on the central anchor 10 will apply a pushing force at the first time. The protrusion 23 of the second hinged piece 8 corresponding thereto makes it easier for the first hinged piece 7 and the second hinged piece 8 in each hinged piece group to overcome the...

Embodiment 3

[0075] The general structure of the recoverable bolt provided in this embodiment is consistent with that of Embodiment 2, but, as Figure 14 As shown, the central anchor rod 10 in this embodiment adopts a multi-stage detachable structure, which includes a plurality of second anchor rod segments 27 whose head and tail are fixed by threaded connection; the second anchor rod segments 27 are arranged in a straight line, and the axes coincide.

[0076] The above-mentioned central anchor 10 has a multi-stage detachable structure, and the second anchor section 27 extending from the reaming section 3 of the hollow anchor 1 can be easily disassembled to reduce the space occupied by the above-mentioned recoverable anchor during use. area.

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PUM

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Abstract

The invention discloses an anchor rod for foundation pit support engineering, in particular to a recyclable anchor rod. The recyclable anchor rod comprises a hollow anchor rod and a central anchor rod, and a water injection gap is formed between the hollow anchor rod and the central anchor rod; the hollow anchor rod is provided with multiple arched hinged sheet groups arranged along the axis of the hollow anchor rod; the end part of one side of the central anchor rod extends out of the hollow anchor rod, and a drill head is formed and fixed with the hollow anchor rod; the end part of the otherside of the central anchor penetrates through a locking screw cap, and under the driving of the locking screw cap, the central anchor rod drives the hollow anchor rod to compress; first hinge sheetsand second hinge sheets in the multiple hinge sheet groups are mutually arched; each hinge sheet group is wrapped with a waterproof cloth sleeve; and high-pressure water bodies can be injected into the water injection gap between the hollow anchor rod and the central anchor rod and the waterproof cloth sleeves, and pressure maintaining is carried out. According to the recyclable anchor rod, the ultimate tensile bearing capacity is larger, and the rod can be completely recycled.

Description

technical field [0001] The invention relates to an anchor rod used in foundation pit support engineering, in particular to a recoverable anchor rod. Background technique [0002] In the construction of foundation pit support in civil engineering, bolt support is a construction technology commonly used for soil wall support during excavation of foundation pits. Its advantages are: it can provide a large working surface, and there is less interference with other processes. The technology is mature, the construction is simple, the cost is low, and the application range is wide; especially suitable for the foundation pit with a large excavation surface. When the excavation area of ​​the foundation pit is large, it will cause great difficulties if the internal support is used, and the support arrangement is complicated, which seriously affects other Process construction. Therefore, various types of soil anchor technology are widely used in slopes, foundation pits, tunnels, under...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D17/04E02D5/74
CPCE02D5/74E02D17/04
Inventor 吴应寿
Owner 宁波中铭岩土工程有限公司
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