KR200329145Y1 - an anchoring apparatus for ground anchor - Google Patents

Abstract

The present invention relates to a ground anchor fixing device, the purpose of which is to reduce the adhesion area of the load bearing body to the minimum to increase the adhesion resistance of the cement grout and the tension member, reduce the anchoring length of the ground anchor, the tension member on the outside of the load body Compared with the conventional anchoring method of arranging and grout hoses, the grout hole can be drilled relatively small due to the reduction of the outer diameter of the entire unit, thereby reducing the anchor construction cost.

The present invention is a ground anchor anchoring device in which a plurality of tension members 20 including a load-bearing body 30 is inserted into the grout hole 10 to be cured together with the cement grout 12, the ends of each tension member 20 The lower body 30 and the inner fixing agent 40 are mounted on the lower body 30 of the tension member 20, respectively, and are installed at different positions, and the grout hose 11 and the tension member 20 are bound to the outside. Characterized in that it is arranged to be positioned. In the ground anchor fixing device, in which a plurality of tension members 20 inserted into the grout hole 10 of the ground and internal fixing bodies 40 are provided at one end of the tension members 20, the tension members 20 are provided. At the end of the) is characterized in that the one inner body 30 is provided with an uneven surface formed on the outer surface so as to transmit the anchor force to the ground.

Description

An anchoring apparatus for ground anchor

The present invention relates to a ground anchor fixing device, and more specifically, by providing one internal fixing agent and a load bearing body at each end of the tension member, it is possible to increase the adhesion resistance of the cement grout and the tension member and to reduce the anchoring length of the ground anchor. The present invention relates to a ground anchor fixing device.

In general, the anchor method is to prevent the ground from collapsing during civil engineering, if the ground is weak during civil engineering and construction work, drill a grout hole in the ground where there is a risk of collapse using a boring machine and grout hose ( grout hose), a plurality of tension members and a load bearing body are prepared and inserted into the unit. Then, grout is injected through the grout hose, and when the injected grout is cured together with the load lower body, an anchor is attached to the other end of the tension member. After tightening the tension member by pulling the tensioner with a tensioner to reinforce the soft ground by tensioning the ground.

In the anchoring method, the components are divided into anchorages that exhibit the required stress, freefields that transmit the stress exerted in the anchorages, and anchorages that allow the required stresses to act on the structure. It is determined by the cement grout, the adhesion resistance of the cement grout and the tension member. The tension member used in the anchoring method mainly uses a wire rope twisted with seven strands of steel wire, and since the wire rope has a small surface area, the anchoring length of the ground anchor becomes long. In such ground anchors, a load bearing body is mounted at the end of the tension member to increase the attachment area of the tension member and reduce the anchoring length of the ground anchor, thereby reducing the installation cost of the ground anchor method.

In the conventional ground anchor fixing device using the load bearing body as described above, at least 4 to 12 tension members 20 are dispersed and arranged on the outer surface of one load bearing body 30a as shown in FIG. 5A, and one grout hose 11 is used. ) Is inserted into the grout hole in a state in which the unit is bundled into one unit, so that the outer diameter of the lower body 30a, the tension member 20, and the grout hose 11 in one unit becomes larger, and thus the grout hole is also greatly drilled. There should be a problem that the cost of anchor construction will be increased.

In addition, as the number of the tension members 20 increases, the outer surface of the lower body 30a is occupied, so that the adhesion area of the lower body 30a is remarkably reduced, resulting in the adhesion between the surface area of the lower body 30a and the cement grout. There was a problem that this can only be reduced.

In particular, as shown in FIG. 5B, the concentrated load acts on the tension member 20 of the portion where the load bearing body 30a is installed, adversely affects the ground, and when one tension member 20 is broken, an unbalance of load occurs. Due to this, there is a problem that adversely affects other tension members 20.

The purpose of the present invention is to research and develop to solve the conventional problems as described above, to provide an inner fixing agent and a load-bearing body at the end of the tension member, respectively, and to the outside of the tension member and the grout hose bundled in one unit By arranging the load-bearing body, the attachment area of the load-bearing body is reduced to a minimum, thereby providing a ground anchor fixing device capable of increasing the adhesion resistance of cement grout and tension member and reducing the anchoring length of the ground anchor.

In addition, the present invention by arranging the inner body on the outer side of the tension member and the grout hose tied together, the outer diameter of the overall unit is reduced compared to the conventional anchoring method of arranging the tension member and the grout hose on the outer side of the inner body, thereby grout hole It can be drilled relatively small to reduce the construction cost of anchors.

In addition, the present invention can be distributed evenly throughout the anchorage of the anchor because the load body is installed at different positions in each tension member, such as stress distribution type, thereby maximizing the support efficiency of the ground and uniform load on the tension member The distribution eliminates the risk of fracture of the tension member.

1 is a schematic view showing a ground anchor fixing device according to the present invention,

2 is a cross-sectional view showing the main portion of the present invention,

3 is an exploded perspective view of FIG. 2;

4a and 4b is a view showing the arrangement of the tension member, the grout hose and the load chamber of the present invention,

Figure 4c is a table showing the adhesion stress distribution of the ground anchor anchoring device according to the present invention,

Figures 5a and 5b is a view showing the arrangement of the tension member, grout hose and load bearing body in the conventional stress distribution ground anchor anchoring device,

Figure 5c is a table showing the stress distribution in the anchor anchor fixing device of Figure 5a,

6 is a cross-sectional view of another embodiment in which the inner body is fixed to the tension member in the device of the present invention.

<Explanation of symbols for main parts of drawing>

10: grout hole 11: grout hose

12: cement grout 13: earth wall

14: external fixing agent 20: tensile material

30: lower body 31: set screw

40: internal fixing agent 41: tension fixing body

42: wedge 43: protective cap

44: washer

In order to achieve the object as described above, the ground anchor fixing device of the present invention has a plurality of tension members inserted into the grout hole, and the inner fixing body is provided at one end of the tension members, respectively, In order to transmit the anchor force to the ground to the tension member is characterized in that it is provided with a single inner body formed with irregularities on the outer surface.

The internal fixation agent includes a tension fixing body in which a through hole, a cone-shaped wedge accommodation space, and a female thread are sequentially formed from the front end; A cone-shaped wedge which is inserted into the wedge receiving space of the tension-retaining body so as to fix the wedge; The space is formed to accommodate the end of the tension member is characterized in that consisting of a protective cap formed with a male screw on the front end to push the wedge. In addition, a washer for pushing the wedge evenly between the tension fixing body and the protective cap may be interposed.

The load-bearing body is characterized in that the fastening directly to the tip of the tension fixing body of the inner fixing agent by screwing or fixed by a set screw to the tension member near the inner fixing agent.

In addition, the present invention is a ground anchor fixing device in which a plurality of tension members including a load bearing body is inserted into the grout hole to be cured together with the cement grout, and the load bearing member and the inner fixing agent are mounted at the end of each tension member. The inner body is installed at different positions, and the grout hose and the tension member are arranged so as to be positioned outside.

Hereinafter, the ground anchor fixing device of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view schematically showing a ground anchor fixing device according to the present invention. Here, the grout hole 10 is equipped with the lower body 30 and the internal fixing agent 40 at the end of each tension member 20 and the lower body 30 at the ends of the tension member 20 are different from each other. In addition, as shown in FIG. 4A, the cement grout 12 is filled in a state in which the grout hose 11 and the tension member 20 are arranged to be located outside the bundle. The outer side of the grout hole 10, that is, the outer side of the tension member 20 drawn out through the earth wall 13, is mounted by the external fixing agent 14.

Figure 2 is an exploded perspective view showing an extract of the tension material, the internal fixing agent and the inner body of the main design, Figure 3 is an assembled cross-sectional view of FIG. Here, the inner fixing body 40 is provided at each end of the tension member 20, and the inner end of the inner fixing agent 40 has one inner surface formed with irregularities on the outer surface in order to transmit the anchor force to the ground. The lower body 30 is provided.

The inner body 30 has a female screw 32 for fastening with the inner fixing body 40 on one inner surface.

The internal fixing agent 40 is composed of a tension fixing body 41 and the wedge 42 and the protective cap 43, the tension fixing body 41 is a through-hole 41a through which the tension member 20 in the center ) Is formed, and a cone-shaped wedge accommodation space 41b in which the wedge 42 is seated is formed behind the through hole 41a, and a first female screw 41c is formed at the rear end of the wedge accommodation space 41b. It is. A first male thread 41d for fastening with the lower body 30 is formed at the front end of the tension fixing body 41.

The wedge 42 constituting the internal fixing agent 40 is divided into two to three so as to have a hole in which a tension member 20 can be inserted into one circle in the center, and the wedge accommodation space of the tension fixing body 41 ( 41b) is inserted into the structure that grips the outer surface of the tension member 20, that is, formed in one cone shape, the inner surface of the wedge 42 should be formed in the inner surface of the wedge 42 does not slip even when the tension member 20 is pulled out .

The protective cap 43 has a space for accommodating the end of the tension member 20 and a second male screw 43c is formed at the front end to push the wedge 42 to pressurize it.

When the second male screw 43c of the protective cap 43 is fastened to the first female screw 41c of the tension fixing body 41 at the rear end of the wedge 42, the wedge 42 is uniformly pushed and pressed. The washer 44 may be interposed so that the protective cap 43 is not affected even when the protective cap 43 is rotated.

The load-bearing body 30 is illustrated and described as being fastened to the distal end of the internal fixing agent 40 by screwing, but as shown in FIG. 6, the set screw 31 is attached to the tension member 20 near the internal fixing agent 40. Can be fixed.

The construction of the anchor using the ground anchor fixing device according to the present invention configured as described above will be described by reference.

First, as shown in FIGS. 2 and 3, the loading body 30 and the internal fixing agent 40 are mounted at the end of each tension member 20, and then the loading body 30 at the end of the tension member 20 is formed. As shown in Figure 1 and Figure 4a, it is provided in a unit arranged to be located at different positions and to be located outside the grouping the grout hose 11 and the tension member 20 as one.

As such, by adopting a method of arranging the load-bearing body 30 in the outer position where the tension member 20 and the grout hose 11 are tied, it can be seen that the attachment area of the load-bearing body 30 is reduced to a minimum. It can be seen that the outer diameter of the entire unit is reduced compared to the conventional anchoring method of arranging the tension member and the grout hose on the outside of the.

Therefore, it is possible to increase the adhesion resistance of the cement grout 12 and the tension member 20 and effectively reduce the anchoring length of the ground anchors, and in particular, to reduce the anchor construction cost because the grout hole 10 can be drilled relatively small. It can be.

In addition, the earth wall 13 is installed on the soft ground, and the grout hole 10 is drilled using a perforator, but the grout hole 10 is drilled in consideration of the reduced outer diameter of the entire unit compared to the existing anchor method. . As the grout hole 10 is reduced, the small amount of equipment can be used and the work can be easily performed, thereby reducing the construction cost.

Subsequently, the unit prepared in the process is inserted into the grout hole 10 from the earth wall 13 and the cement grout 12 is injected through the grout hose 11 of the unit, and the injected cement grout 12 is loaded into the load bearing body. Allow curing with (30).

When the cement grout 12 is cured together with the lower body 30, the external fixing agent 14 is fastened to the other end of the tension member 20 on the earth wall 13 side, and then the tension member 20 is pulled by the tensioner. (12) and the ground to reinforce the soft ground.

As shown in FIG. 4B, when the tension member 20 is pulled and tensioned, relatively low stress is evenly distributed throughout the anchorage of the anchor as compared with the conventional stress anchor ground anchor fixing device. Therefore, the load-bearing body 30 is installed in each tension member 20 in a different position and the load-bearing body 30 is installed in each tension member 20 like the stress distribution type, and thus it is evenly distributed throughout the anchorage of the anchor. Due to this, the support efficiency of the ground is maximized and the tension member 20 and the ground do not have a bad influence on the tension member 20 and the ground with a uniform load distribution.

As described above, the ground anchor fixing device of the present invention provides one internal fixing agent and a load bearing body at each end of the tension member, and the load bearing body is arranged on the outside of the tension member and the grout hose which are bundled into one unit. The adhesion area of is reduced to a minimum, thereby increasing the adhesion resistance of cement grout and tension member and effectively reducing the anchoring length of the ground anchor. In addition, the outer diameter of the entire unit is reduced compared to the conventional anchoring method of arranging the tension member and the grout hose on the outer side of the inner body, and thus the boring hole can be drilled relatively small to reduce the anchor construction cost.

In addition, the present invention can be distributed evenly throughout the anchorage of the anchor because the load body is installed at different positions in each tension member, such as stress distribution type, thereby maximizing the support efficiency of the ground and uniform load on the tension member It is useful in industry without the risk of fracture of tensile material due to the distribution.

Claims (6)

In the ground anchor fixing device having a plurality of tension members 20 inserted into the grout hole 10 of the ground, and the internal fixing body 40 is provided at one end of the tension members 20, respectively. Ground anchor anchoring device, characterized in that the inner end body 30 is formed with an uneven surface formed on the outer surface so as to transmit the anchor force to the ground at the end of the tension member (20). The internal fixing agent (40) according to claim 1, further comprising: a tension fixing body (41) having a through hole (41a), a cone-shaped wedge accommodation space (41b), and a first female screw (41c) sequentially formed from the front end thereof; A plurality of cone-shaped wedges 42 inserted into the wedge accommodation space 41b so as to grip the tension member 20; Ground anchoring device, characterized in that the space formed to accommodate the end of the tension member 20 is formed of a protective cap (43) formed with a second male screw (43c) at the front end to push the wedge (42). The ground anchor fixing device according to claim 2, wherein a washer (44) is interposed between the tension fixing body (41) and the protective cap (43) to uniformly push the wedge (42). The ground anchor fixing device according to claim 1 or 2, wherein the lower body (30) is directly connected to the tip of the tension fixing body (41) of the inner fixing agent (40) by a screwing method. The ground anchor fixing device according to claim 1 or 2, wherein the lower body (30) is fixed to the tension member (20) near the inner fixing agent (40) by a set screw (31). The method according to claim 1, wherein the lower body 30 and the internal fixing agent 40 are mounted at each end of the tension member 20, and the lower body 30 of the tension member 20 is installed at different positions. Ground anchor anchoring device, characterized in that the grout hose 11 and the tension member 20 is arranged to be located outside the bundle.