CN111287182A

CN111287182A - Bagged hot-melting gourd body full-recovery anchor rod and construction method thereof

Info

Publication number: CN111287182A
Application number: CN202010249397.3A
Authority: CN
Inventors: 张继红
Original assignee: 张继红
Priority date: 2020-03-24
Filing date: 2020-03-24
Publication date: 2020-06-16
Also published as: CN112726599A; CN215857671U

Abstract

The invention relates to a bagged hot-melt gourd body full-recovery anchor rod and a construction method thereof in the field of geotechnical engineering, the anchor rod consists of a high-strength bag (2), a hot-melt anchoring body (1) and an electric heating wire (3), wherein the outer surface of the high-strength bag (2) can be designed into a rugged gourd shape, so that the side resistance of the anchor rod is improved, and the high-strength bag (2) generated from an outer anchoring end and a rock-soil body or a rock-soil reinforcing body outside the high-strength bag are stripped in a gradual destruction mode by pulling the high-strength bag (1) after the hot-melt anchoring body (1) is melted during anchor rod recovery, so that the anchor rod is easy to realize full recovery and reuse, can be fully recovered, is easy to realize recovery in a narrow space, and has high bearing capacity, low manufacturing cost and high construction speed.

Description

Bagged hot-melting gourd body full-recovery anchor rod and construction method thereof

Technical Field

The invention relates to a bagged hot-melting gourd body full-recovery anchor rod in the field of foundation pit support engineering.

Background

In the foundation pit enclosure engineering, the anchor rod support is low in cost and high in construction speed, and the biggest problem of using the anchor rod in the foundation pit support is that after the foundation pit is backfilled, the anchor rod is retained in a soil body to become a high-strength solid residue, so that the development and the use of a subsequent underground space are influenced. The recoverable anchor rod provides a solution for solving the problem of high-strength solid residue, when the recoverable anchor rod is recovered, a common underground structure is built, only a narrow operation space commonly called a fertilizer tank is left, even if a flexible material with small rigidity such as a steel strand is used, the operation is very difficult during recovery, and the recovery rate of the currently used recoverable anchor rod is low. How to ensure that the recoverable anchor rod can be recovered by 100 percent and how to smoothly carry out recovery operation in a narrow operation space is a technical problem in the field of recoverable anchor rod engineering.

Disclosure of Invention

The invention aims to provide a bagged hot-melting gourd body full-recovery anchor rod which is easy to install, can be recovered by 100 percent, has high recovery speed and is suitable for realizing anchor rod recovery construction in various narrow operation spaces.

The bagged hot-melting gourd body full-recovery anchor rod comprises a high-strength bag, a hot-melting anchoring body and an electric heating wire, wherein the hot-melting anchoring body is solid under the normal temperature condition and liquid after being heated, the hot-melting anchoring body is positioned in the high-strength bag, the high-strength bag is a bag-shaped body made of flexible materials and capable of providing tensile bearing capacity of the anchor rod, the outer surface of the high-strength bag is in a rugged shape, and the electric heating wire is in close contact with the hot-melting anchoring body.

In the bagged hot-melting gourd body full-recovery anchor rod, the high-strength bag is a member wound on a rod piece with a rough outer surface.

The second purpose of the invention is to provide a construction method of the bagged hot-melting gourd body full-recycling anchor rod, which can smoothly realize full recycling of the anchor rod, and has reliable construction process, good environmental protection benefit and low manufacturing cost.

The construction method of the bagged hot-melt gourd body full-recovery anchor rod comprises the following steps:

a) filling the hot-melt anchoring body into a high-strength bag, and melting the hot-melt anchoring body by heating to manufacture a bagged hot-melt gourd body full-recovery anchor rod with a rugged outer surface;

b) placing the bagged hot-melt gourd body fully-recycled anchor rod manufactured in the step a) into a rock-soil body or a rock-soil reinforcement body on the periphery of an excavation surface of a foundation pit, so that the anchor rod has tensile bearing capacity;

c) applying prestress to the exposed section of the high-strength bag for tensioning and fixing;

d) excavating a foundation pit to finish the construction of an underground structure;

e) removing the fixed connection of the exposed section of the high-strength bag;

f) electrifying the electric heating wire in the bagged hot-melting gourd body full-recovery anchor rod to melt the hot-melting anchor body;

g) the high-strength bag is pulled outwards, so that the uneven outer surface of the high-strength bag is gradually stripped from the rock-soil body or the rock-soil reinforced body on the outer side of the high-strength bag section by section in a gradual destruction mode;

h) and (4) taking out the high-strength bag from the rock-soil body to realize anchor rod recovery.

According to the bagged hot-melting gourd body full-recovery anchor rod and the construction method thereof, the high-strength bag is used as the tensile member and is easy to recover in a narrow space, and the outer surface of the anchor rod is made into a gourd shape, so that the frictional resistance of the anchor rod can be improved, and on the other hand, the high-strength bag can be gradually damaged from the outer anchor end during recovery, so that the high-strength bag and a rock-soil body or a rock-soil reinforcement body on the periphery of the bag are easy to peel off after the hot-melting anchoring body is melted.

Drawings

Fig. 1 is a schematic structural view of a bagged hot-melt gourd body total recovery anchor rod used in one embodiment of the invention.

Detailed Description

The invention discloses a bagged hot-melting gourd body fully-recycled anchor rod and a construction method thereof, which are taken as an embodiment of the invention and are described in the following by combining with figure 1. Firstly, the structure and the working principle of the bagged hot-melting gourd body full-recycling anchor rod of the invention are described with reference to fig. 1. As shown in figure 1, the bagged hot-melting gourd body full-recovery anchor rod comprises a hot-melting anchoring body (1), a high-strength bag (2) and an electric heating wire (3), wherein the high-strength bag (2) is also used as a tension member, and in a use state, the hot-melting anchoring body (1) is solid, and due to the fact that the outer surface of the high-strength bag (2) is in the shape of a gourd with an uneven surface, frictional resistance is generated between the outer surface of the high-strength bag and a peripheral soil body reinforcing body or a soil body. In the embodiment, the high-strength bag (2) can be wound on the rod with the rough outer surface to form a commonly stressed rod body. When the anchor rod is recycled, the hot-melt anchor body (1) is heated and melted through the electric heating wire (3), and then the high-strength bag (2) is pulled out, so that full recycling is realized. When the hot-melt anchoring body (1) is in a liquid state, the high-strength bag (2) is wrinkled, so that the high-strength bag can be easily peeled from the rock-soil body or the rock-soil reinforced body at the periphery of the high-strength bag (2) in a gradual destruction mode under the action of tensile force, and the recovery is easy. The high-strength bag (2) is flexible, so that the bag is suitable for recycling operation in a narrow space. The following part of the present embodiment describes a construction method of a bagged hot-melt gourd body fully-recycled anchor rod according to the present invention with reference to fig. 1. The construction method of the bagged hot-melt gourd body full-recovery anchor rod comprises the following eight steps. Firstly, hot melt materials are put into a high-strength bag (2), the hot melt materials are melted by heating to manufacture a hot melt anchoring body (1) with an uneven outer surface, and a bagged hot melt gourd body full recovery anchor rod is manufactured, wherein the shape of the anchor rod can be shown in figure 1. In the step, the outer surface of the high-strength bag (2) can be coated with a hot-melt anchoring body (1) or grease lubricant to reduce the condensation force between the high-strength bag (2) and a rock-soil body or a rock-soil reinforcing body, and the bearing capacity provided by the anchor rod cannot be influenced due to the uneven outer surface of the high-strength bag (2). And finishing the first step and entering the second step. In the step, the bagged hot-melt gourd body fully-recycled anchor rod manufactured in the first step is placed into a rock-soil body or a rock-soil body reinforcing body on the periphery of the excavation surface of the foundation pit, so that the anchor rod has tensile bearing capacity. In the step, holes can be pre-drilled, the bagged hot-melt gourd body full-recovery anchor rod is placed into the drilled holes, and then grouting is performed into the drilled holes to fill the gaps between the anchor rod and the rock-soil body to form the anchor rod. The bagged hot-melting calabash body fully-recycled anchor rod can be hung on a drill bit of a high-pressure jet grouting pile, an oblique jet grouting pile is constructed in a soil body, and the bagged hot-melting calabash body fully-recycled anchor rod is placed in a rock-soil body. And finishing the second step and entering the third step. In the step, the exposed section of the high-strength bag (2) is applied with prestress to stretch and fix. Because the high-strength bag (2) is flexible, the high-strength bag (2) is tensioned through prestress tensioning, and has bearing capacity under the condition of expected displacement, and the step is a step for overcoming the requirement that the high-strength bag (2) is made of flexible materials as a stress component. And finishing the third step and entering the fourth step. In this step, a foundation pit is excavated to complete the construction of the underground structure. And finishing the fourth step and entering the fifth step. After the anchor rod is used, the fixed connection of the exposed section of the high-strength bag (2) is released, and preparation is made for recovering the anchor rod. And finishing the fifth step and entering the sixth step. In the step, the electric heating wire (3) in the bagged hot-melt gourd body full-recovery anchor rod is electrified to generate heat to melt the hot-melt anchor body (1), in the step, the hot-melt anchor body (1) can be melted into a fluid state after being heated, if a material with a lower melting point is selected, the melting is easy, if the material has a higher melting point, the electric heating wire (3) with higher power needs to be selected for heating, and the hot-melt material which can be reused is preferably selected for use, so that the material can be taken out and reused after being melted into the fluid, the repeated use is realized, and the cost is reduced. And finishing the sixth step and entering the seventh step. In the step, the uneven outer surface of the high-strength bag (2) is gradually stripped from the rock-soil mass or the rock-soil reinforcement body on the outer side of the high-strength bag (2) section by pulling the high-strength bag (2) outwards until the far end of the anchor rod. And finishing the seventh step and entering the eighth step. In the step, after the high-strength bag (2) is completely peeled from the rock-soil body or the rock-soil reinforcement body on the periphery of the high-strength bag, the high-strength bag (2) can be taken out, so that the anchor rod is recycled, and the hot-melt material can be completely taken out for recycling. Thereby completing the construction method of the bagged hot-melting calabash body full-recovery anchor rod.

This patent includes, but is not limited to, other construction methods that may be substituted by those skilled in the art.

Claims

1. The bagged hot-melting gourd body full-recovery anchor rod is characterized by comprising a high-strength bag (2), a hot-melting anchoring body (1) and an electric heating wire (3), wherein the hot-melting anchoring body (1) is solid at normal temperature and liquid after being heated, the hot-melting anchoring body (1) is positioned in the high-strength bag (2), the high-strength bag (2) is a bag-shaped body made of flexible materials and capable of providing tensile bearing capacity of the anchor rod, the outer surface of the high-strength bag (2) is in a rugged shape, and the electric heating wire (3) is in close contact with the hot-melting anchoring body (1).

2. The bagged hot-melt gourd body fully-recycled anchor rod as claimed in claim 1, wherein said high-strength bag (2) is a member wound around a rod member having a rough outer surface.

3. The construction method of the bagged hot-melt gourd body full-recycling anchor rod as claimed in claim 1, comprises the following steps:

a) putting the hot-melt anchoring body (1) into a high-strength bag (2), melting the hot-melt anchoring body (1) by heating to manufacture a bagged hot-melt gourd body fully-recycled anchor rod with a rugged outer surface;

c) applying prestress to the exposed section of the high-strength bag (2) for tensioning and fixing;

e) the fixed connection of the exposed section of the high-strength bag (2) is released;

f) electrifying the electric heating wire (3) in the bagged hot-melt gourd body full-recovery anchor rod to melt the hot-melt anchor body (1);

g) the high-strength bag (2) is pulled outwards, so that the uneven outer surface of the high-strength bag (2) is gradually stripped from the rock-soil body or the rock-soil reinforced body on the outer side of the high-strength bag (2) section by section in a progressive destruction mode;

h) and (3) taking out the high-strength bag (2) from the rock-soil body to realize anchor rod recovery.