Hydraulic expansion anchoring type recoverable anchor rod device

Abstract

The utility model discloses a hydraulic expansion anchoring type recoverable anchor rod device which comprises an anchor rod body with a center hole and is characterized in that the anchor rod body is sleeved with a plurality of sections of rubber expansion sleeves, through holes communicated with the center hole are machined in the positions, inside the rubber expansion sleeves, of the anchor rod body, and a slotted steel expansion pipe is arranged outside the rubber expansion sleeves; a one-way liquid injection valve is arranged at one end of the anchor rod body, and when emulsified oil is injected into the rubber expansion sleeve through a liquid injection gun, the slotted steel expansion pipe is opened and attached to the hole wall to achieve the anchoring effect. After engineering is completed, emulsified oil is discharged, the steel expansion pipe recovers to the original shape under the action of elasticity of the steel expansion pipe, the steel expansion pipe can be smoothly taken out of a drill hole and reused, and the engineering cost is reduced.

Description

Technical Field

[0001] The utility model patent relates to an anchor rod device, in particular to a hydraulic expansion anchoring type recyclable anchor rod device. Background Art

[0002] At present, in the construction of mines and building foundation pit slopes, the anchoring method of anchor support is generally used for temporary support. There are mainly the following types of anchoring forms of anchor support: one is to insert the anchor rod into the drill hole, use an anchoring agent to anchor the end at the bottom of the hole, tighten the outside of the hole with a tray and a nut to apply a preload; the second is to insert the anchor rod into the drill hole, and grout the hole for full anchoring; the third is to use the elasticity of the pipe seam anchor rod to expand on the hole wall, and rely on friction to form a full anchor. These anchoring forms of anchor rods have the following shortcomings: it is not easy to withdraw the anchor after the project is completed, and it will remain in the drill hole. It cannot be easily withdrawn for recycling and reuse, resulting in high project costs. The current cable anchor support is similar to the above-mentioned anchor rod support. Summary of the invention

[0003] In order to overcome the deficiencies of the prior art, the present invention provides a hydraulic expansion anchoring type retrievable anchor rod device which is easy to withdraw.

[0004] The technical solution is a hydraulic expansion anchoring type recoverable anchor device, including an anchor body, which is a metal rod body with a center hole, characterized in that several sections of rubber expansion sleeves are sleeved on the anchor body, and the two ends of the rubber expansion sleeves are tightly sealed with the anchor body by clamps, and a through hole communicating with the center hole is processed on the anchor body inside the rubber expansion sleeve, and a slit steel expansion tube is provided on the entire anchor length and outside the rubber expansion sleeve; the outer diameter of the slit steel expansion tube is 2 to 5 mm smaller than the drill hole diameter; a one-way injection valve is provided at one open end of the anchor body, and the other end is closed and provided with a cone head; the outer diameter of the cone head is equivalent to the diameter of the slit steel expansion tube, and its purpose is to make the cone head block the slit steel expansion tube to ensure that the slit steel expansion tube cannot be misaligned with the anchor body during tensioning.

[0005] In order to apply tension force, threads are processed on the hole mouth of the anchor body and a tray nut is provided.

[0006] The above-mentioned hydraulic expansion anchoring type retrievable anchor device is a single-section type, which is used in tunnels with a designed anchoring depth less than the tunnel width, and is used in places such as slopes and foundation pits where there is no length restriction.

[0007] When used in a tunnel with a designed anchoring depth greater than the tunnel width, a single-section type is not easy to install, and it can be designed as a multi-section type, that is, the device is designed into multiple sections according to the length required on site, and the sections are threadedly connected by threaded coupling bodies. Except for the anchor rod body at the hole, each of the other anchor rod bodies is covered with at least one rubber expansion sleeve and one slotted steel expansion pipe. The diameter of the threaded coupling body is greater than the diameter of the slotted steel expansion pipe, and its purpose is to make the slotted steel expansion pipe block the threaded coupling body after it is expanded, so that it cannot slide and dislocate with the anchor rod body.

[0008] When using, first insert the first section into the drilled hole, and then connect the second section with a threaded connector outside the hole, and so on, until the section of the anchor rod that leaks out of the hole is connected, and then install the one-way injection valve. If it is a tensioning type, it is also necessary to install a tray nut.

[0009] The working principle and positive effect are that the anchor device is installed in the borehole, and then the emulsified oil is injected into the inner cavity of each rubber expansion sleeve of the anchor device through the one-way injection valve with an injection gun. The rubber expansion sleeve expands outward, stretches the slit steel expansion tube, and sticks to the hole wall, thereby tightening it in the borehole to play an anchoring role. When the project is completed and the support system needs to be unanchored, the one-way injection valve is opened to release the emulsified oil, and the steel expansion tube returns to its original shape under its own elasticity, so it can be smoothly taken out of the borehole and reused, reducing the project cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the structure of embodiment 1; Figure 2 It is a schematic diagram of the structure of Example 2; Figure 3 This is a schematic diagram of the structure of Example 3; Figure 4 This is the cross-sectional structure diagram of the seam steel expansion pipe; Figure 5 It is a front view cross-sectional view of the ferrule of Example 3; Figure 6 for Figure 5 Right view of .

[0011] Legend: 1. One-way injection valve; 2. Nut; 3. Tray; 4. Anchor rod; 5. Clamp; 6. Through hole;

[0012] 7. Rubber expansion sleeve; 8. Slit steel expansion pipe; 9. Cone head; 10. Threaded connection body; 11. Expansion seam; 12. Bolt. DETAILED DESCRIPTION

[0013] Example 1

[0014] like Figure 1As shown, a hydraulic expansion anchoring type recyclable anchor device is a single-section type, including an anchor body 4, the anchor body 4 is a metal rod with a center hole, two sections of rubber expansion sleeves 7 are sleeved on the anchor body 4, the two ends of the rubber expansion sleeve 7 are clamped with a clamp 5 to achieve sealing with the anchor body 4, and a through hole 6 corresponding to the rubber expansion sleeve 7 is processed on the anchor body 4, so that the rubber expansion sleeve 7 is connected with the center hole; a slit steel expansion tube 8 is provided on the entire anchor length and outside the rubber expansion sleeve 7; the outer diameter of the slit steel expansion tube 8 is 2 to 5 mm smaller than the borehole diameter; a one-way injection valve 1 is provided at one end of the anchor body 4 outside the borehole, and a cone head 9 is threadedly connected at one end in the borehole, and the outer diameter of the cone head 9 is equivalent to the diameter of the slit steel expansion tube 8, the purpose of which is to make the cone head 9 block the slit steel expansion tube to ensure that it cannot be misaligned with the anchor body during tensioning. The clamp 5 can also be replaced by a self-locking cable tie.

[0015] In order to apply the tension force, a thread is processed at the hole opening of the anchor body 4, and a tray 3 and a nut 2 are provided.

[0016] The structure of the above-mentioned slit steel expansion pipe 8 is as follows Figure 4 As shown, an inclined expansion joint 11 is provided in the length direction of the steel pipe.

[0017] Example 2

[0018] like Figure 2 The hydraulic expansion anchoring type recyclable anchor device shown is based on Example 1. The structure of this device is different from that of Example 1 in that it is designed into multiple sections according to the length required on site (only two sections are shown in the figure, and each section is provided with a rubber expansion sleeve 8), and the sections are threadedly connected by a threaded coupling body 10. Except for the anchor rod body at the hole mouth, each of the other anchor rod bodies is covered with at least one rubber expansion sleeve 7 and one slit steel expansion tube 8; the diameter of the threaded coupling body 10 is larger than the diameter of the slit steel expansion tube 8, so that the slit steel expansion tube 8 is blocked on the threaded coupling body 10 after expansion and cannot slide and dislocate with the anchor rod body 4. A cone head 9 is threadedly connected to one end at the bottom of the drill hole, and the outer diameter of the cone head 9 is slightly larger than the diameter of the slit steel expansion tube 8, so that the slit steel expansion tube 8 is blocked on the cone head 9 after expansion, so as to ensure that it cannot be dislocated with the anchor rod body 4 during tensioning. When each section is very long, multiple rubber expansion sleeves 8 can be provided.

[0019] The structure of the above-mentioned seamed steel expansion tube 8 is as described in Example 1.

[0020] When in use, first insert the first section (the section at the bottom of the hole) into the drilled hole, connect the tail exposed outside the hole to the second section, the third section, and so on, until the section leaking out of the hole is connected, and install the one-way injection valve 1.

[0021] Example 3

[0022] like Figure 3 The hydraulic expansion anchoring type recyclable anchor rod device shown in the figure is based on the embodiment 2. The difference between the structure of the device and the embodiment 2 is that the clamp 5 is replaced by a clamp sleeve. Figure 5 Figure 6 As shown in the figure, it is composed of two halves, a circle of slots is provided in the sleeve, light holes are provided on both sides of the upper half of the sleeve, and screw holes are provided on both sides of the lower half of the sleeve, which are tightened by bolts 12. At the same time, bosses are provided at both ends of the rubber expansion sleeve 8, and the bosses are stuck in the slots of the sleeve.

Claims

1. A hydraulic expansion anchoring type retrievable anchor device, comprising an anchor body with a central hole, characterized in that: Several sections of rubber expansion sleeves are sleeved on the anchor rod body, and both ends of the rubber expansion sleeves are sealed with the anchor rod body. A through hole connected to the central hole is processed on the anchor rod body at the position of each section of the rubber expansion sleeve, and a slit steel expansion tube is sleeved on the outside of all the rubber expansion sleeves; the outer diameter of the slit steel expansion tube is 2 to 5 mm smaller than the diameter of the drilled hole; a one-way injection valve is provided at the open end of the anchor rod body, and the other end is closed and provided with a cone head that can block the slit steel expansion tube.

2. The hydraulic expansion anchoring type retrievable anchor device according to claim 1, characterized in that: The anchor rod body is composed of multiple connected sections; the sections are connected by threaded coupling bodies, and each section of the anchor rod body is sleeved with at least one section of rubber expansion sleeve and one section of slotted steel expansion pipe.

3. The hydraulic expansion anchoring type retrievable anchor device according to claim 1 or 2, characterized in that: The clamps at both ends of the rubber expansion sleeve are replaced by self-locking cable ties or clamping sleeves, and one of them is selected.

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