KR200242474Y1 - anchorage device for ground anchor with removing tension member - Google Patents

Abstract

The present invention is a wedge bite on the tip of the tension member as the wedge recedes when the tension member bounces toward the tip due to the reaction of the tension applied to the tension member at the moment of release of the external fixation, or when the hammer hits the outer end of the tension member on which the external fixation is released. The wedge seat 11 and the cap are provided to provide a tension member of the ground anchor which can be easily removed by removing the wedge assembly by the wedge assembly when the tension member is released and fixed to the cap as it is removed. The main body 1 having the fastening screw 14 formed therein and the inner ring 23 retained in the combined state by the outer ring 22 fitted in the ring groove 21c of the outer circumferential surface and mounted in the inner ring groove 21e. Wedge assembly (2) to be inserted in the direction of opening and to insert the membrane 32 into the membrane groove (21d) formed in the front of the inner ring groove (21e), and the cap (4) on the main body 1 is fastened There Then, the clasp 3 which seats the membrane 32 of the elastic hook 31 in the membrane groove 21d of the wedge assembly 2, and the latching jaw 41 which the hook 31 crawls into and locks. Characterized in that the fixing member for the tension member removal ground anchor consisting of a cap (4).

Description

Anchorage device for ground anchor with removing tension member

The present invention relates to an internal fixing body of a tension member-removable ground anchor, and in particular, when the external member is released, when the tension member bounces toward the tip due to the reaction of the tension applied to the tension member, or the external end of the tension member whose external fixing is released. When the wedge is retracted, the wedge bites on the tip of the tension member are released and fixed to the cap as it is, so that the wedge assembly does not come out of the tension material when removing the tension material so that the tension material can be easily removed. It relates to a fixture.

Ground anchors, or earth anchors, are excavation works for underground structures to construct or build construction and civil structures, while retaining earthquakes and preventing soil loss on the cut surface of the soft ground. It is widely used as a safety measure for doing so.

Ground anchors having such a purpose include compression type, tension type and acupressure type. Tensile ground anchors are the most commonly used type of ground anchors, but they cannot remove the tension member. Anchor ground anchors are constrained by tip pressure, which leads to difficulty in removing the tension members after construction.

In terms of securing the anchoring force, the tensioned ground anchor is reduced in the anchoring force due to the tensile cracking of the grouting body over time, and the anchoring anchor is limited to the place of use such that it is applicable only to the rock which is capable of tip acupressure.

Ground anchors use anchoring materials (mild steel wires) with excellent tensile strength to insert anchor bodies into anchor holes drilled in the ground and secure the anchoring force by applying loads to the free long ends, and when drilling deep into the ground using the anchoring force In order to improve the safety of related construction, it is to stabilize the earthen wall, that is, the temporary earth wall, installed on the excavation surface.If the tension material is left in the ground after completion of the construction work on the underground structure, when the underground structure for the adjacent ground is constructed in the future, Since it is an obstacle to the construction, there are challenges to be solved, such as civil complaints and additional construction costs to remove the tension member.

In view of the above-mentioned various aspects, an internal fixing agent for a ground anchor has been proposed. As a representative example thereof, there is a patent publication No. 96-4273. In this prior art, the internal fixer lined with a main body with a sun wedge seat in the center and a satellite wedge seat around it, a two or three split sun wedge and a satellite wedge seat, a sun wedge and a satellite wedge, a satellite wedge It consists of an equal number of spacers, an upper cover for preventing the upward departure of the sun wedge and the satellite wedge, and a cap which covers the main body.

However, the above-mentioned internal anchorage for ground anchors is a recovery action tension member for removing these tension members in addition to the tension member bite of the satellite wedge that exhibits substantially tensile force, that is, a recovery action tension member bitten by a solar wedge and a wedge that fits it. As an essential component requirement, there are flaws that increase the number of components of underground anchors, increase the manufacturing cost due to the addition of recovery operation tension members, and draw out the recovery operation tension members.

In addition, the inner surface of each spacer is given a taper corresponding to the tapered recovery action tension member, the side is given a taper corresponding to the taper of the adjacent satellite wedge, and the outer surface has a complicated arcuate shape corresponding to the hollow of the main body. Cutting and assembly difficulty was also high.

In addition, by inserting a ring groove at the rear of the center hole drilled in the axial direction at the center of the main body, a C-shaped stop ring for the center material is inserted so that the center material inserted into the center hole does not fall to the rear of the main body while the tension force is not applied. Complicated internal structure was forced to have a lot of labor.

In addition, if the quoted tension member was loosened prior to removal of the recovery action tension member, there was a possibility that the pullout would slide out of the solar wedge when the tension member applied. Indeed, when this happens, the returning tensioner, which must be pulled back by the sun wedge, must not retreat, and satellite wedges do not open. As a result, all tension members are faced with a non-removable state. Moreover, conventional tension member removal type internal fixing members cannot remove the tension member without using a dedicated drawing machine.

It is the Korean Patent Laid-Open Publication No. 2000-47445 to compensate for the shortcomings of the internal fixing body for the tension member-removable ground anchor. This improved internal fixing unit accommodates a wedge tube base in which a heat-transfer body is embedded in a thermoplastic resin in a body having one or more wedge grooves, and places a wedge tube on the wedge tube base so that a tension member can be placed between the main body and the wedge groove of the wedge tube. When the tension is applied to the tension member while the tip is inserted, the tension is settled, and when the current is passed through the wire connected to the heating element from the outside, the wedge stays in place when the wedge container base of the resin component melts due to the heat of the heat transfer element. Only when the wedge bite on the tip of the tension member is disengaged in the process of being pulled out to the outer end of the tension member by the tension applied to the tension member, the tension member is bent to the outer end by the tension and inverted to a state in which it can be removed.

However, when the wedge tube holder melts, the tension member-removable internal fixing body is not only dangerous because the sparking phenomenon occurs when the spiral portion connected with the heating element and the wire contacts the main body, and the wedge tube holder melts by disconnection. Efficient recovery of the tension material is difficult because the wedge bin does not retract and the wedge bite is not completely released. In addition, the manufacturing difficulty of wedge holders was high and the cost increase was a problem.

It is an object of the present invention to provide an inner fixing body for a tension member-removable ground anchor which can draw out and remove a tension member as it is when external fixing to the tension member is released.

The main feature of the present invention is that the fixing state of the tension member by the internal fixing agent is released only by releasing the external fixation to the rear end of the tension member so that it can be easily drawn and removed even by the manpower.

That is, the wedge assembly is pushed when the tension member is struck toward the tip in response to disassembling the external fixture in the state where the tension member is fixed or cutting the portion of the tension member immediately inside the external fixture with a welding machine or the like to release the fixation. The wedge assembly pushed therein is opened by an elastic inner ring mounted therein. As the wedge assembly is retracted, all wedges open at once and the wedge bites to the ends of the tension member spontaneously unfold to be ready for removal of the tension member. Can be removed smoothly.

1 is an example of the use of the ground anchor

2 is an exploded view of the tension member removal type fixing body according to the present invention

3 is a perspective view of a clamp

4 is an assembled cross-sectional view of the internal fixing body in which the tip of the tension member is fixed;

5 is a cross-sectional view of the wedge bite is released to the front end of the tension member

6 is a modified embodiment of the clamp and the locking jaw

7 is its action

<Description of the symbols for the main parts of the drawings>

1 body 2 wedge assembly

3: clasp 4: cap

21f: Hanging jaw groove 31: Hook

32: the film 41: jamming jaw

In Figure 1, the tension member removal ground anchor for stabilizing the earth wall, concrete retaining wall (E), etc. is inserted into the anchor hole (C) by biting at least one strand of the tension member (A) to the internal fixing member (B). After fixing the grout material in the anchor hole (C) and fixing the tension member (A), the rear end of the tension member (A) is fixed to the outer fixing body (D) inside the earth wall or concrete retaining wall while being tensioned with the tension member (A).

In FIG. 2, the tension member removing fixing body according to the present invention is composed of a main body 1, a wedge assembly 2, a wedge clamp 3, and a cap 4. The main body 1 is tubular, and an inner circumferential surface has a reverse conical wedge seat 11 formed therein, and the bottom of the wedge seat 11 is fitted with a tension member A inserted into the synthetic resin tube F when the tube F is inserted. The tip of the tube is limited to the insertion length of the tube seat 12 is formed to sit. In addition, the upper portion of the wedge seat 11 is provided with a clearance 13 and a cap 14 for fastening the cap 4 close to a straight wall given a space for allowing the wedge assembly 2 to retreat. It is.

The wedge assembly 2 is a combination of a circumferential wedge 21, an outer ring 22 for keeping the plurality of wedges 21 in a combined state, and an inner ring 23 for opening the wedge 21. . The wedge 21 is divided into two or three circumferences, and an outer circumferential surface thereof corresponds to the upper portion 21a and the wedge seat 11, which are substantially confronted with the slack portion 13 of the wedge seat 11. It consists of the taper part 21b. The ring groove 21c is formed on the outer surface of the upper portion 21a and the outer ring 22 is enclosed to maintain the combined state of the wedge 21.

In addition, a membrane groove 21d is formed at the upper end of the inner surface of the wedge 21 to engage the membrane 32 of the clamp 3, and a ring groove (2) into which the inner ring 23 enters the lower portion of the membrane groove 21d. 21e) is also formed. The inner ring ring groove 21e is placed below the outer ring ring groove 21c to smoothly open the gap by the inner ring 23 when the wedge 21 moves to the front end of the inner ring 1. This is to ensure that the wedge bite on the tip of is effectively released. Here, the inner ring 23 and the ring groove 21e are omitted in the case of designing the wedge 21 to be easily opened by the force of the jamming of the outer ring 22 by using the membrane 32 of the clamping point 3 as a supporting point. can do.

The outer ring 22 collects a plurality of circumferentially divided wedges 21 to maintain a loose coupling state, which was previously a rubber ring. However, such rubber rings are not suitable for the present invention. This is because the outer ring 22 in the present invention needs to suppress the wedge 21 from coming out of the tension member when the tension member which is wedge-released is removed. Yet the first half of the wedge 21 must have a force that can pinch the back, ie elasticity to open. Thus, the outer ring 22 is suitable for the elastic C-type metal ring.

The inner ring 23 is to open the wedge 21 to release the wedge bite on the tip of the tension member, as opposed to the outer ring 22 that collects the plurality of circumferentially divided wedges 21 and keeps them in a loose combination. The inner ring 23 is also an elastic ring that can be retracted and elastically opened, and a C-type metal ring having elasticity is suitable for spreading a plurality of wedges 21 held together with a strong force by a tension member at once.

In FIG. 3, the clamp 3 is led to the wedge assembly 2 as it is pushed towards the tip in response to the strong tension held thereon as soon as the external fixation to the rear end of the tension member is released. Later, when pulling out the tension member, it does not come with the tension member, and when an external pressure is applied in the circumferential direction, it retracts elastically toward the center, and when the external pressure disappears, a disk-shaped film 32 is formed at the rear end of the elastic hook 31. It is attached. After the external fixation of the tension member is released, the hook 31 is caught by the hook hook of the cap 4 to lock the wedge assembly 2 which is led. The membrane 32 is a circular metal plate of a size that does not escape the membrane groove 21d after the wedge assembly 2 bites the tip of the tension member and enters the main body 1.

The cap 4 inserts a tension member at the rear end of the main body 1, prevents the infiltration of foreign matter by blocking the front end of the main body 1 in a state where the wedge assembly 2 is seated and saddled at the front end of the tension member. When the clasp 3 is pushed to the reaction force of the tension member as the external fixation is released, the wedge assembly 2 is led and locked, and the hook 31 having the elasticity of the clasp 3 crawls into the jaw. It has the locking jaw 42 which locks. In the illustrated example, but shown in the form of a separate ring of the locking step 42, it may be formed integrally in the cap (4) as shown in FIG. The screw 41 is a part fastened to the screw 14 of the main body 1.

Reference numeral 5 denotes a separator that helps the wedge 21 to be easily separated from the wedge seat 11 when removing the tension member, and saddles the wedge seat 11.

4 shows the wedge assembly 2 in which the tip of the tube F-coated tension member A is inserted through the rear end of the main body 1 and the membrane 32 of the clamp 3 is coupled to the membrane groove 21d. After inserting and fixing, it shows the internal fixing agent which is coupled to the cap (4) to the main body (1). Thus, it is applied to the site with the tip of the tension member (A) fixed.

Next, with reference to FIG. 5, it is assumed that the earth wall and the concrete retaining wall are stabilized by applying tension to the tension member A. A method of removing the tension member A after the construction will be described.

The external fixation to the rear end of the tension member (A) is released. The external fixation release of the tension member (A) includes a method of removing the external fixer, and a method of cutting a portion of the tension member in the remaining space between the strip and the external fixer support by a welder. When the external fixation of the tension member (A) is released in any way, the tension member (A) is deflected toward the tip in response to the tension applied to the tension member (A).

When the tension member A breaks out in this way, the membrane 32 is pushed. Membrane 32 is pulled away leading wedge assembly 2. As the wedge assembly 2 is drawn to the membrane 32, the inner ring 23 opens the wedge 21, and the hook 31 enters the catching jaw 41 of the cap 4 to lift the wedge assembly 2. Walk and lock.

At some point when the wedge assembly 2 unfolds, the tip of the tension member A, which has always been bite, is released. In this way, the tensioning material (A) in which the internal fixation is released can be removed by the attraction force, and the tensioning material (A) can be removed very easily.

FIG. 6 shows that the hook 31 without the membrane 32 is formed upside down in the ceiling of the cap 4, and the membrane groove 21d in the wedge 21 has the membrane 32 separated or separately made from the clamp 3. And a separate locking jaw groove 21f in front of the blocking groove 21d to saddle the washer-type locking jaw 41 in place of the locking jaw 41. As shown in FIG. 7, the inner fixing body of this modified embodiment has a catching jaw 41 while the membrane 32 guides the wedge assembly 2 while the externally released tension member A moves toward the cap 4. As it is covered by the hook 31, the wedge assembly 2 is locked from being pulled out when the tension member A is drawn out.

It goes without saying that the above tension member removal type fixing structure can also be applied to two or more multi-spherical internal fixing bodies.

As described above, the inner fixing body for the tension member-removable ground anchor according to the present invention is to be pulled toward the front end by the reaction of the tension that is held when the external member is released from the rear end in the state where the tension member is fixed, or the tension member. If you move the end of the wedge with a hammer, the wedge assembly is pushed away from the tensioning material and all the wedges are opened to release the wedges against the tip of the tensioning material. As it does not come out, it is very simple to release external fixation to the rear end of the tension member, and the tension member can be drawn and removed very easily.

Claims (2)

The main body 1 having the wedge seat 11 and the cap fastening screw 14 formed therein and the outer ring 22 fitted in the ring groove 21c of the outer circumferential surface maintain the combined state and are mounted in the inner ring groove 21e. The wedge assembly 2 which is inserted in the direction of the inner ring 23 and is inserted into the membrane groove 21d formed in front of the inner ring groove 21e, and the cap 1 on the main body 1 4) in the fastening, the fastener 3, which seated the membrane 32 of the elastic hook 31 in the membrane groove 21d of the wedge assembly 2, and the hook 31 crawls and locks. Fixing member for ground anchor removal type, characterized in that consisting of a cap (4) having a locking jaw (41). The method of claim 1, wherein the hook 31 is formed on the bottom surface of the cap (4), and the locking jaw groove (21f) in front of the closing groove (21d) of the wedge assembly 2 to form a washer-type locking jaw (41) Fixture for tension member-removable ground anchors with a saddle.