KR200443038Y1 - Removable Earth Anchor - Google Patents

Abstract

The present invention relates to a removable earth anchor, in which an expanding agent is inserted into a support hole drilled in a cut surface of a pit work site and is fixed and supported by cement grouting, and a support cone at the end of a corrugated pipe having a steel wire inserted into the grouting is installed. And a plurality of split wedges are installed on the support cones, and support steel wires for earth anchors are supported by the respective split wedges, while an elastic spring is installed between the split wedges and the support cones. In the earth anchor, which is provided with a fixing rubber ring on the circumferential surface of the split wedge, an auxiliary pipe having a small diameter is installed in the corrugated pipe from the inlet to the back of the support cone, and the number of supporting steel wires is provided in the auxiliary pipe. A plurality of matching towing wires are built in, the leading end of the towing wire being the circumference of the split wedge It is fixed with a rubber ring and associated structure is installed on. The removable earth anchor of the present invention having such a structure dismantles the wedge supporting the earth anchor steel wire from the outside of the cut surface after the construction is completed, and then pulls the towing wire to support the inside of the earth anchor steel wire. By letting the split wedge out of the support cone, the fastening of the earth anchor steel wire can be dismantled and simply pulled by hand to remove it from the basement. Therefore, the earth anchor of the present invention pulls and disassembles the split wedges which fasten the earth anchor steel wires inside by using the towing iron wires, thereby releasing the bite state of the earth anchor steel wires accurately and simply. Can be obtained.

Earth anchor, remove, split wedge

Description

A removal type earth anchor

1 is a cross-sectional view showing an example installed on the excavation surface using the earth anchor according to the present invention,

2 is an enlarged cross-sectional view of the distal end of FIG. 1;

Figure 3 is an internal cross-sectional view showing the front end coupled state of the removable earth anchor according to the present invention,

Figure 4 is an exploded perspective view showing the distal end coupling structure of the removable earth anchor according to the present invention,

5 is a perspective view showing a state in which a wire for traction is connected to the split wedge used in the removable earth anchor according to the present invention,

Figure 6 is a plan view showing a state in which the traction iron wire is evenly arranged at intervals of 120 degrees to the split wedge used in the removable earth anchor according to the present invention.

* Description of symbols on the main parts of the drawings *

1-Earth Anchor 2-Cut Face

3-support hole 4-cement grouting

5-corrugated pipe 6-support cone

7-Split Wedge 8-Liner

9-Resilient Spring 10-Retaining Rubber Ring

11-Auxiliaries 12-Towing Wires

13-Partition 14-Passing Groove

15-Protective cap 16-Wedge

17-support wall plate 18-support iron plate

19-wedge 20-closing cap

The present invention relates to an earth anchor for use in earthquake construction, and more particularly, to an earth anchor that can be easily and reliably removed after construction.

In general, it is necessary to construct a block to prevent the soil from falling down when reinforcing natural and artificial slopes adjacent to trenches, blocks, railroads and roads, or civil works such as keeper structures and tunnels. Soil nailing and earth anchor are used a lot.

Although the earth anchor method and the soil nailing method have advantages and disadvantages, they are selected and used according to the characteristics of the project site.

Nailing method is to drill the installation hole in the state of reinforcement by spraying concrete on the cut surface, and insert the nail and cement grout made of reinforcing bars into the installation hole, the nail is fixed and supported by cement grouting, the outside of the cut surface The pressure plate and the fixing nut are installed at the tip of the exposed nail so that the cut surface does not collapse.

On the other hand, the earth anchor method inserts several strands of steel wire and cement grouting into the installation hole formed on the inclined cut surface, so that the steel wire is attached and supported by the cement grouting, while the pressure plate and the end of the exposed steel wire are exposed to the outside of the inclined cut surface. By connecting the support beams, the pressure plate and the support beams are supported by steel wires so that the soil on the inclined surface does not collapse.

However, the iron wire and the reinforcing nail inserted into the cut surface according to the earth anchor method and the soil nail method are respectively installed in the installation holes drilled in the inclined direction with respect to the vertical cut surface. It will be drilled into and installed.

This problem may be a violation of other people's private property because of the law that land ownership extends to the ground and underground if earth anchors or soil nails are installed under other people's land in urban areas or in places where many people live. Will be.

However, especially in the case of digging the ground in the vertical direction underground to build a building, the earthquake construction is essential for the protection of the surrounding buildings, the protection of the cut surface, and the safety of the construction site. Essentially used.

As a way to solve the essential problems of the construction site and infringement of private property at the same time, earth anchor or soil nail is installed under other people's land when construction is done, and the soil is secured after construction is completed. Eliminating nails or earth anchors solves the problem of infringing others' property.

In this way, various methods for removing the earth anchor have been proposed. For example, the design according to the “wire anchor removal device of the earth anchor” of Utility Model Registration No. 20-344971 has provided a welding member and a tensioner to the steel wire, When it is necessary to remove the steel wire by applying power to the welding member to electrically melt the steel wire, the steel wire is dismantled in the stretched state, and the tensioner pulls the removed steel wire to remove it.

However, such a device requires a welding member and a tensioner to install the earth anchor, requires a power source to operate the welding member, and takes a long time because the welding member must be melted by supply of current. There was a problem.

As another method, the invention according to the "spring built-in removal earth anchor" of Patent Registration No. 10-403280 is installed with the wedge supporting the steel wire at the tip of the installation hole compressed with the spring, and the other end of the spring. Is pulled out of the installation hole of the cut surface, and after completion of construction, the spring is pulled out of the exposed hole to the outside of the installation hole of the cut surface, and the spring is forced out of the locked state.

However, the conventional removal type earth anchor has a disadvantage in that, as the tensile force of the anchor steel wire increases, the pressure applied to the left and right sides of the spring increases, so that the circular spring shape is deformed in an elliptical shape, and the spring tip is not pulled out when removed.

Therefore, the conventional apparatus as described above has a problem that it is difficult to accurately remove the earth anchor steel wire after the construction is completed, and the spring wire is often broken, so that the steel wire buried underground can not be completely removed. .

Accordingly, the present invention solves the problem of the conventional earth anchor as described above, and can accurately and reliably remove the steel anchor wire buried underground, and provides a simple earth anchor removable structure. There is a purpose.

Earth anchor of the present invention for achieving the purpose of the bar is inserted into the support hole drilled in the cut surface of the pit work construction site is fixed and supported by cement grouting, at the end of the corrugated pipe with a steel wire inserted into the grouting A support cone is installed, and a plurality of split wedges are installed in the support cone, and a support steel wire for earth anchors is supported by each split wedge, while an elastic spring is installed between the split wedge and the support cone. In the earth anchor is formed on the circumferential surface of the split wedge is provided with a fixing rubber ring, an auxiliary pipe having a small diameter from the inlet to the back of the support cone is installed inside the corrugated pipe, the supporting steel wire of the auxiliary pipe A plurality of towing wires corresponding to the number are built-in, and the tip of the towing wire is divided into wedges. It has a structure associated with the fixed rubber ring provided on the peripheral surface.

And the front end of the auxiliary pipe may be provided with a splitting table for dividing the traction iron wire toward each split wedge, or a structure in which a through groove is formed in the leading edge of the split wedge so that the traction iron wire can easily pass. It may be.

The removable earth anchor of the present invention having such a structure dismantles the wedge supporting the earth anchor steel wire from the outside of the cut surface after construction, and then pulls the towing wire to support the earth anchor steel wire from the inside. By letting the split wedge out of the support cone, the earth anchor steel wire is dismantled so that it can be simply pulled out by hand and removed from the drilled hole.

Therefore, the earth anchor of the present invention is constructed by the effect of releasing the bite state of the earth anchor steel wire accurately by pulling and dismantling the split wedge that fastens the earth anchor steel wire inside using a towing iron wire. This can shorten the period and reduce the construction cost.

Hereinafter, with reference to the accompanying drawings, an apparatus according to the present invention will be described in detail.

1 is a cross-sectional view of an example showing a state installed on the excavation surface using the earth anchor according to the present invention, Figure 2 is an enlarged cross-sectional view of the front end of Figure 1, Figure 3 is a front end of the removable earth anchor according to the present invention 4 is an exploded perspective view showing the distal end coupling structure of the removable earth anchor according to the present invention.

As shown in these drawings, the earth anchor 1 according to the present invention is inserted into the support hole 3 drilled in the cut surface 2 of the pit work site, the structure is fixed and supported by the cement grouting (4) It is.

And a support cone 6 is connected to the tip of the corrugated pipe 5 inserted into the support hole 3, a plurality of split wedges 7 are provided in the support cone 6, each of the divided An earth anchor support steel wire 8 inserted through the support cone 6 is inserted into and supported by the wedge 7.

In addition, an elastic spring 9 is provided between the split wedge 7 and the support cone 6, and a fixing rubber ring 10 is provided on the circumferential surface of the split wedge 7.

3 and 4, an auxiliary pipe 11 having a small diameter is installed in the corrugated pipe 5 from the inlet to the back of the support cone 6, and the inside of the auxiliary pipe 11 is shown. A plurality of towing iron wires 12 corresponding to the number of supporting steel wires 8 are embedded therein, and a fixed rubber ring 10 having a tip end of the towing iron wires 12 installed on the circumferential surface of the split wedge 7. It is connected to the structure.

In addition, a split table 13 may be provided at the tip of the auxiliary pipe 11 to divide the traction iron wire 12 toward each split wedge.

In addition, it is also possible to form and use a passage groove 14 for the traction iron wire 12 to easily pass through to reach the rubber ring 10 at the leading edge of the split wedge (7).

And the protective cap 15 is installed at the tip of the support cone 6 to which the split wedge 7 is coupled, so that grouting penetrates into the split wedge 7 and the support cone 6 and the support tube 5. Do not go.

The cut surface (2) for installing the device of the present invention made of such a structure is a part which is formed as a vertical or inclined surface when digging down to the ground when building a building or when performing civil works such as a road, If it is left as it is, there is a risk of collapse, so the construction site must not be preserved, and in order to ensure the safety of the workers in the underground excavation work, the earthwork should be absolutely cut to the cut surface (2).

Therefore, when digging out the soil, using a dedicated drilling machine for every predetermined depth, drills the support hole 3 inclined at a predetermined angle, and installs the earth anchor 1 according to the present invention in this hole (3).

Earth anchor according to the present invention is basically a plurality of strands of steel wire (8) is built in the interior of the corrugated pipe (5), the split wedge in the state where the front end of the steel wire (8) is inserted through the support cone (6) The structure is fixed and supported by 7).

The support cone 6 is inserted into and fixedly connected to the tip of the corrugated pipe 5, and the split wedge 7 is inserted into the wedge groove 16 of the support cone 6 to be caught by the split wedge 7. One end of the steel wire 8 is fixedly supported.

The auxiliary pipe 11 disposed along the corrugated pipe 5 is made of a small diameter material made of a plastic material which is inexpensive and easy to handle, and is disposed between the plurality of steel wires 8 and supports the support cone ( It penetrates 6) and extends to the rear of the split wedge 7.

In addition, the split table 13 installed at the tip of the support cone 6 may be formed by spreading the tip of the auxiliary pipe 11 or may be used by installing a separate trumpet-shaped member. The towing wire 12 inserted through the auxiliary pipe (11) serves to help the spread evenly divided at intervals of 120 degrees as shown in Figure 6.

As described above, the traction iron wire 12 inserted through the auxiliary pipe 11 has a through groove formed in each of the divided surfaces of the split wedge 7 divided into three pieces, as shown in FIGS. 5 and 6. It is connected to the rubber ring 10 through 14, one pull wire 12 drawn out from the auxiliary pipe 11 is divided into three strands, one rubber ring as shown in Figure 6 ( 10) are connected at intervals of 120 degrees.

Therefore, as described later, when the traction iron wire 12 is pulled, the rubber ring 10 fitted to the outer circumferential surface of the split wedge 7 can be easily pulled out in one operation.

In this way, while fixing the anchor steel wire (8) through the split wedge (7) at the distal end of the corrugated pipe (5), connecting the traction iron wire (12) to the rubber ring (10) of the split wedge (7) The protective cap 15 is placed on the tip of the support cone 6, and then inserted into the support hole 3 as shown in FIG. 1, and then the inner wall of the corrugated pipe 5 and the support hole 3 are installed. Fill the routing with cement in between.

Then, when the cement grouting is completely solidified, the supporting wall plate 17 or the supporting iron plate 18 is installed outside the cut surface 2, and the anchor wire 8 is placed outside the supporting wall plate 17. After pulling using a tensioner, the wedge 19 and the closing cap 20 are installed at the tip of the steel wire 8 so that the steel wire 8 supports the cut surface 2 firmly.

At this time, the tip of the traction iron wire 12 inserted into the auxiliary pipe 11 is also drawn to the outside of the cut surface 2 to be tied together.

Thus, this construction is completed by installing the earth anchor according to the present invention, when you want to remove the installed earth anchor, first release the wedge (19) by tightening the tip of the steel wire (8) in the cut surface (2). .

As such, when the steel wire 8 is released from the outside, the split wedge 7 is buried backward by the restoring force of the spring 9 that elastically supports the split wedge 7 with respect to the support cone 6. However, due to the binding force of the rubber ring 10 provided on the circumferential surface of the split wedge 7, the split wedge 7 is completely pulled out, and the binding of the steel wire 8 is not completely released.

In this state, when pulling the pulling wire 12 drawn out of the cut surface (2), as described above, the rubber ring 10 of the split wedge 7 tightening the tip of the steel wire (8) ) And the rubber ring 10 is peeled off, so that the split wedge 7 completely exits the inclined wedge groove 16, and thus the force holding the steel wire 8 disappears.

 After the split wedge (7) is completely out of the wedge groove (16), simply pull out the steel wire (8) on the cutting surface (2), it will come out easily. In this way, the steel wire 8 for earth anchors can be easily removed.

As described above, the removable earth anchor according to the present invention is connected to the towing wire 12 to the rubber ring 10 of the split wedge (7) to hold the wire for the earth anchor, the towing wire ( 12) is installed inside the auxiliary pipe 11 and pulled out to the outside of the cut surface 2 so that the earth anchor steel wire 8 can be removed after the construction is completed, the outside of the steel wire 8 In addition to the removal of the wedge, pulling the pull wire 12 for tightening the internal cleavage of the wedge (7) is released so that the steel wire (8) can be easily pulled out.

Therefore, while the earth anchoring device according to the present invention is made of a simple structure, it is possible to reliably release the locked state of the steel wire (8) easily, so that the problem that the steel wire is partially buried underground and does not occur. There is a number.

Claims (3)

The support cone is inserted into the support hole 3 drilled in the cut surface 2 of the pit work site and fixedly supported by the cement grouting 4, and is supported by the end of the corrugated pipe 5 inserted into the support hole 3. (6) is connected, a plurality of split wedges (7) are provided on the support cone (6), each of the divided wedges (wire) for earth anchors inserted through the support cone (6) ( 8) is inserted and supported, while an elastic spring 9 is installed between the split wedge 7 and the support cone 6, and a fixing rubber ring 10 is provided on the circumferential surface of the split wedge 7. In the installed earth anchor, In the interior of the corrugated pipe (5) is provided with a small diameter auxiliary pipe 11 from the inlet to the back of the support cone (6), a plurality of the number of steel wires (8) matching the number of steel wires (8) Towing iron wire 12 is built-in, the removable earth anchor, characterized in that the front end of the towing iron wire 12 is connected to the fixed rubber ring 10 installed on the circumferential surface of the split saw wedge (7) 2. The removable earth anchor according to claim 1, wherein a splitter 13 is provided at the distal end of the auxiliary pipe 11 to divide the traction iron wire 12 toward each split wedge. The removal groove according to claim 1, characterized in that a passage groove (14) is formed at the leading edge of the split wedge (7) to allow the towing iron wire (12) to easily pass and reach the rubber ring (10). Expression Earth Anchor

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