KR20030049855A - inner fixing device for a tension member removetype ground anchor - Google Patents

Abstract

PURPOSE: An inner anchorage for a removal ground anchor of a tension member is provided to heighten the reliability on assembly. CONSTITUTION: The inner anchorage for a removal ground anchor of a tension member comprises a main body(1) composed of a screw(14) for fastening a screw cap, a ring projection for a locking ring(15) and a wedge seat for a wedge assembly(2), a wedge assembly(2) formed by fitting a tension stopper(7), a wedge opening ring(6) and a wedge closing ring(5) into a stopping groove(21f), an opening ring groove(21g) and an outer closing ring groove(21d) of the wedge(21) respectively and provided with many wedges(21) having a locking groove(21e), a screw cap(3) provided with a screw(32) fastened with a screw(14) of the main body(1), and a wedge separator(9) placed between the wedge seat(11) and the wedge(21).

Description

Inner fixing device for a tension member removetype ground anchor

The present invention, when anchored in the underground anchor hole and built underground structures and underground structures, and bite this together with the tension member as a reaction force when the anchorage is released by cutting the external fixing end of the tension member fixed to the strip side of the earth wall The present invention relates to an internal fixing unit for ground anchors that enables wedge assembly to be retracted and the wedge bite to the tension member is released so that the tension member can be easily removed by manpower without mobilizing equipment such as a drawing machine. The present invention relates to a tension member-removable internal fixing body for ground anchors, which has a wedge bite retained by the tension member until the ground anchors are transported to the site by the end of the body, and the wedge bites are maintained.

The inner fixing body for the tension member removal type ground anchor of the prior art patent application No. 2001-15335 (the same content as the registered utility model No. 235095) is loaded on the main body by inserting a long tension member tip from the back of the wedge assembly. Wedge bites are loosened due to the tension of the tension material during transporting by the vehicle, getting off after arriving at the site, inserting into the anchor hole, etc. You may lose.

If the wedge bite of the wedge assembly loosened by the tip of the tensioner for any reason, it loses its function as an internal fixture. In the case of ground anchor construction, the wedge bite of the tension member was found to be loose, and the screw cap and the wedge assembly were pulled out to re-fit and reassemble the tension tip.

Therefore, when the external anchorage of the tension member is released, the tension member and the wedge assembly are pulled back by the reaction force and the wedge bite is released and the internal fixture for the tension member-removable ground anchor is inverted to the state where the tension member can be removed. Effective measures to prevent this loosening are urgently needed.

It is an object of the present invention to increase the reliability of the wedge bite of the internal fixture to the tensioner by allowing the wedge assembly to snap the tip of the tensioner into the wedge assembly so that it remains intact unless the wedge bite is intentionally released.

In the above-mentioned problems, in the internal fixing body for the tension member-removable ground anchor which allows the wedge assembly to withdraw and the wedge bite is released by the reaction force of the tension member when the fixing to the outer end of the tension member is released, the front end of the tension member is disposed at the rear end of the main body. Inserted into the wedge assembly, lightly bitten, and then inserted into the wedge seat of the main body where the wedge separator is placed with the C-shaped wedge safety ring inserted into the ring horn at the tip of the wedge assembly to prevent the wedge assembly from spreading. When seated and the screw cap is fastened to the front end of the main body, the outer edge of the wedge safety ring is caught between the front end of the safety ring support that sits on the ring chin of the main body and the inner side of the rear end of the screw cap to prevent unauthorized retraction of the wedge assembly. Even if the tension member and the internal fixing body are shaken or an external impact is applied during construction, Can achieve wedge engagement the tension member body removal type ground anchor for internal fixation of the present invention is configured to be retained on the distal end.

The wedge safety ring is inserted into the anchor hole in the ground and grouted to fix it, and when the tension load is applied to the tension member is drawn to the tip of the tension member, the wedge assembly is moved to the rear end of the main body to bite the tension member strongly, As the ring horn escapes from the wedge safety ring, as the internal bearing force by the ring horn disappears, the wedge safety ring is retracted by its elasticity, falling out between the safety ring support and the bevel of the screw cap and falling into the screw cap. When the wedge safety ring that hangs in front of the wedge assembly disappears, after constructing the underground structure, the band of the earth wall is removed, and the tension material just inside the external fixture is cut by a welding machine to remove the tension. There is no problem in the wedge assembly retreating by the reaction force of the tension member. Thus, the tension member can be easily removed using a simple tool such as hand force or hand spanner as in the above-described prior art.

1 is an example of the use of the ground anchor

2 is a front view of the internal fixing body according to the present invention;

2 is an exploded view of the internal fixing body according to the present invention;

4 is an enlarged longitudinal section of the wedge;

Figure 5 is a cross-sectional view of the assembly

6 is a cross-sectional view showing the change of the wedge safety ring when the tensile force is applied to the tension member

7 is a cross-sectional view illustrating a change at the moment when the external fixation of the tension member is released;

8 is a cross-sectional view when the wedge bite is released by turning the outer end of the tension member in which the external fixing is released.

9 is a front view when a plurality of internal fixing bodies are attached to a single support plate and used;

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

1 body 2 wedge assembly

3: screw cap 4: wedge safety ring

5: wedge locking ring 6: wedge opening ring

7: tension member membrane 8: safety ring support

9: wedge separation membrane 15: ring jaw

21: wedge 21a: ring horn

33: slope

In Fig. 1, the tension member removing ground anchor installed to stabilize the earth wall, the concrete retaining wall F, and the like is inserted into the anchor hole C of the ground by snapping the tip of the tension member A to the internal fixing member B. After fixing the grout material (E) in the anchor hole (C), and fixed to the tension member (A) in the state in which the belt is installed on the earth wall or concrete retaining wall fixed to the external fixing body (D).

In FIG. 2, the tip of the body 1 is covered with a screw cap 3 to protect components embedded in the body 1 including the wedge assembly.

In FIG. 3, the internal fixing agent for the tension removing ground anchor is a main body 1 and a wedge assembly 2, a screw cap 3, a wedge safety ring 4, a wedge locking ring 5, and a wedge opening ring 6. ), A tension member membrane 7, a safety ring support 8, and a wedge separation membrane 9.

The main body 1 is tubular, and the rear end portion of the inner circumferential surface is a wedge seat 11 tapered by the beneficiation post-negotiation, and a tension member covered with a flexible synthetic tube at the center of the rear end of the main body 1, which is the rear of the wedge seat 11. A tube groove 12 is also formed in which the tip of the tube is fitted when the tip of the tube is fitted. In addition, the front portion of the wedge seat 11 has a clearance 13 close to a given straight wall to secure a space for the wedge assembly 2 to retreat, and a screw cap 3 at the front of the clearance 13. Screw 14 for fastening the fastener, ring jaw 15 is also provided at the distal end of the margin 13 to seat the wedge locking ring (5).

The wedge assembly 2 is arranged in the circumferential direction of a plurality of wedges 21 divided into two or three circumferences. Referring to FIG. 4, a ring horn 21a for fitting the wedge safety ring 4 is formed at the front end surface of the wedge 21, and the outer circumferential front end portion 21b of the wedge 21 is the wedge seat 11. This is a face similar to the margin 13. The second half of the wedge 21 is a tapered surface 21c corresponding to the wedge seat 11. The tapered surface 21c serves to strongly agitate the tension member while the wedges 21 are attracted to the front end of the tension member by the force of the tension member when the tension member is tensioned. Further, a semicircular locking ring groove 21d is formed in the circumferential direction about the middle of the outer surface of the tip portion 21b. The lock ring groove 21d maintains the assembled state of the wedge assembly 2 by inserting the wedge locking ring 5, and the wedge assembly 2 withdraws by the reaction force when the external fixation of the tension member is released is removed. It is a shallow groove with a smooth curved edge to make it easier for the wedge assembly 2 to escape from the locking ring 5, which is locked when the wedge assembly 2 does not come out.

A wedge locking groove 21e is formed at the boundary between the tip portion 21b of the wedge 21 and the rear half portion 21c, that is, behind the locking ring groove 21d. The wedge locking groove 21e is a locking groove in the locking ring 5 when the wedge assembly 2 is retracted by the force of the tension member to be pushed toward the tip of the inner fixing body by the reaction force as soon as the external fixing of the tension member is released. The tension member is smoothly removed by being locked by the locking ring (5) which retracts elastically at the same time as the (21e) is matched so that the wedge assembly (2), which is retracted when the wedge bite is removed later, does not come out of the tension member. It is.

And a blocking groove 21f is formed at the point ahead of the locking ring groove 21d on the inner surface of the wedge 21. The closing groove 21f is a relay means for reaction force that transfers the reaction force of the tension member to the wedge assembly 2 when the tip of the tension member bitten by the wedge assembly 2 comes into contact and releases the external fixation. It is the seat to which the tension member membrane 7 which serves as the stopper which limits the insertion length when the bite is inserted.

Further, an opening ring groove 21g is formed at the rear of the membrane groove 21f on the inner surface of the wedge 21. The open ring groove 21g is where the wedge open ring 6 which opens the wedges 21 is fitted. The opening ring groove 21g is placed behind the locking groove 21e. This is necessary to make the wedges 21 easily open by the opening ring 6 when the wedge assembly 2 retracts in the body 1 so that the wedge bite to the tip of the tension member is easily released.

In FIG. 3 again, the screw cap 3 is fastened to the given screw 14 at the tip of the main body 1 to protect all the internals of the main body 1 while at the same time the internal fixture is fixed and the tension is applied to the tension member. Before, the safety ring 4 is confined together with the main body 1, and an angled head 31 which is easily twisted by a spanner is formed at the center of the front end surface, and the screw 14 of the main body 1 is formed on the outer surface of the rear end. The screw 32 corresponding to this is formed. The inner edge of the rear end of the screw cap 3 is an outwardly tapered slant surface 33. This inclined surface 33 is a wedge (21), which has a temporary fixation to the front edge of the wedge safety ring (4), and the wedge (21), which accompanies the tension member when the tension member is tensioned in the internal fixing body fixed in the anchor hole. When the ring horn 21a of the) is removed, it is necessary to allow the wedge safety ring 4 to retract elastically and to easily escape between the screw cap 3 and the safety ring support 8.

The wedge safety ring 4 is fitted to the ring horn 21a as the wedge assembly 2 and the safety ring support 8 is mounted on the front surface of the wedge locking ring 5 that is seated on the ring jaw 15 of the main body 1. External factors such as the fluctuation of the tension member and the internal fixture and external impact until the tension is applied to the tension member by inserting and fixing the inner fixing body in the anchor hole of the ground between the tip of the screw cap and the bevel surface 33 of the screw cap (3). It is a C-type elastic ring which temporarily hangs and locks so that the wedge bite state of the tension member by the wedge assembly 2 is maintained.

The wedge locking ring 5 collects a plurality of wedges 21 in the circumferential direction to maintain the shape of the wedge assembly 2, and when the external fixation of the tension member is released, the wedge assembly 2 of the wedge assembly 2 that has been drawn back by the reaction force is released. The locking groove 21e crawls into the locking groove 21e at the moment when the lock groove 21e coincides with the approach and locks the wedge assembly 2 in place and locks it in place.

The wedge opening ring 6 gathers the plurality of circumferentially divided wedges 21 together to open the wedges 21 outwardly as opposed to the wedge locking ring 5 which maintains the combined state in the combined state with the inward elasticity. It is a C-type elastic ring to let go of the tension material which I bite.

The tension member membrane 7 is inserted into the membrane groove 21f to transfer the reaction force to the wedge assembly 2 at the moment when the external fixation of the tension member is released, so that the wedge assembly 2 bites the tip portion of the tension member. It is a circular metal plate having a radius and strength that does not leave the membrane groove 21e after being settled in (1).

The safety ring support 8 supports the back edge of the wedge safety ring 4 on the wedge locking ring 5 fitted in the wedge assembly 2 and is interposed between the bevel 33 of the screw cap 3. It is a metal ring which supports the safety ring 4 so that it may be maintained correctly.

The wedge separator 9 prevents the wedges 21 from sticking to the wedge seat 11 even when the tension member is subjected to tension, so that the wedge assembly 2 can be easily moved from the wedge seat 11 by the reaction force of the tension member when the external fixing is released. It is a non-adhesive flexible material such as a fan-shaped synthetic resin film cut to suit the wedge seat 11 to help the user to slip back.

Fig. 5 shows a cross section in the case where the tip of the tension member A coated with the tube G is sandwiched in the internal fixing body. The assembly sequence until this is as follows. When the circumference is divided into two, two wedges 21 are arranged, and when the circumference is divided into three, the wedges 21 are arranged in the circumferential direction, and the wedge opening ring 6 is placed in the opening ring groove 21g of the wedge 21. After inserting the tension member membrane 7 into the membrane groove 21f, the wedges 21 are inserted in the center direction, and the locking ring 5 is fitted to the locking ring groove 21d by inserting the locking ring 5 at the distal end of the wedge 21. This itself takes the form of a wedge assembly 2.

The wedge separation membrane 9 is placed on the wedge seat 11 in a state where the front end of the tension member A is inserted into the center of the rear end of the main body 1 so as to protrude to the front end of the main body 1 and the wedge assembly membrane 9 is placed therein. Insert the tension member (A) so that the tip touches the tension member membrane (7) toward the rear end of the. Subsequently, the safety ring support 8 is fitted on the front end of the wedge assembly 2 and placed in front of the wedge locking ring 5, and the wedge safety ring 4 is fitted to the ring horn 21a. Thus, the wedge assembly 2 having the tip of the tension member A snapped into the wedge seat 11 of the main body 1 is seated and the screw cap 3 is fastened to the front end of the main body 1 so that the wedge assembly 2 The front end and the back of the ring tuck 15 and the wedge safety ring 4 are on the same line, and the front edge of the wedge safety ring 4 is pressed against the inclined surface 33 of the screw cap 3.

In this assembled internal fixture, the wedge safety ring 4 hangs the tip of the wedge assembly 2 and prevents it from retreating. This state is maintained until assembly of the internal fixture and insertion into the anchor hole of the ground anchor construction site, and the tensile member A is subjected to a significant tensile force. As a result, the tip of the tension member (A) is inserted into the inner fixing body, and the wedge assembly (2) does not recede despite the impact and the shaking of the tension member (A) and the inner fixing member during handling, transportation, and construction. Wedge bite reliability of the tension member by the internal fixing body is ensured. The high reliability of the wedge bite on the tension member of the internal fixture not only increases the construction quality of the ground anchor, but also the wedge of the tip of the tension member (A) before inserting the internal fixture into the underground anchor hole at the construction site. It is convenient to be able to escape the hassle that had to be checked manually whether or not the wedge bite of the assembly 2 is kept securely.

In Fig. 6, when the internal fixing body is inserted into the anchor hole, the grout material is filled and fixed, and the tension member A is tensioned, the main body 1, the wedge safety ring 4, and the wedge locking ring 5 are magnetic seats. In the wedge assembly (2) only the bite of the end of the tension member (A) without being stuck in, while being drawn in the direction of the wedge (11) while being pulled in the direction of the tension is more strongly bite the tension member (A).

In FIG. 7, the wedges 21 that have moved in the tensioning direction come to have their ring horns 21a deviate from the wedge safety ring 4. The yield load of a 12.7 mm strand wire used as a ground anchor tension member is slightly over 15 tonnes, but the design anchorage load when used as a ground anchor tension member is generally 10 to 12 tonnes. As a result of the experiment, it was confirmed that the ring horn 21a of the wedge 21 fell out of the wedge safety ring 4 at about 1.5 to 2.5 tons when the tension material A was energized and fixed.

When the ring horn 21a is temporarily removed from the wedge safety ring 4, the wedge safety ring 4 elastically retracts due to its elasticity and the force of the inclined surface 33 of the screw cap 3 to push in the center direction. . Then, when the outer diameter of the wedge safety ring 4 is smaller than the inner diameter of the screw cap 3, the wedge safety ring 4 escapes between the screw cap 3 and the safety ring support 8 and falls into the screw cap 3. After the wedge safety ring 4 which prevents the wedge assembly 2 from retreating disappears, there is room for the wedge assembly 2 to retreat when the external fixing of the tension member A is released.

Next, insert the internal fixing body at the tip of the anchor hole, fill the grout material to fix it, and apply tension to the tension member (A) to fix it on earth wall, concrete retaining wall, etc., and finish the necessary construction and remove the tension member (A). This will be described with reference to FIG. 8.

The fixing to the outer end of the tension member (A) is released. The tension removal of the tension member (A) is usually released by cutting the portion of the tension member immediately inside the outer fixture (D) with a welder. When the external fixation of the tension member A is released, a reaction force of the same magnitude as the tension is applied at that moment, and the tension member A is crushed toward the tip due to the reaction force. As the tension member A is pushed out, the tension member membrane 7 is pushed, and the tension member membrane 7 pulls the wedge assembly 2. As the wedge assembly 2 is drawn to the tension member membrane 7 and moves forward of the body 1, the locking ring groove 21d is released from the wedge locking ring 5 and the wedge opening ring 6 is connected to the wedge seat 11. The wedge 21 is opened in the centrifugal direction by a gap formed between the tapered surfaces 21C.

Then comes the moment when the locking groove 21e of the wedge 21 coincides with the inner end of the wedge locking ring 5. At that time, the locking ring 5 is retracted elastically to lock the locking groove 21e. The wedge assembly 2 then no longer retracts or retracts. At this time, the tension member A is already released from the wedge assembly 2, that is, the wedge bite is released. When the wedge bite of the tension member by the wedge assembly 2 is released, the tension member A contained in the tube G can be easily drawn out and removed simply by pulling the outer end of the tension wall by hand.

The above description is about one set of internal fixing members, but when applied to a ground anchor having a large fixing load, as shown in FIG. 9, the same number of tensile holes are drilled in the main body 1 of two or more sets of internal fixing members. It can also be used by welding to the support plate H. In this figure, reference numeral I denotes a tension guide and J denotes a load bearing body.

As described above, when the door wedge assembly is inserted into the wedge seat of the main body where the wedge separator is placed by inserting the front end of the tension member, and the screw cap is fastened to the front end of the main body, the wedge assembly is prevented from being stepped back between the main body and the screw cap. By adding the wedge safety ring and the safety ring support, it is possible to firmly maintain the wedge bite of the tension member by the wedge assembly until it is inserted into the underground anchor hole after fixing the internal fixture and fixed, and the tension member is applied by tension. .

Therefore, as soon as the external anchorage of the tension member is released, the wedge bite is released by the reaction force, and the assembly of the internal anchorage for the tension member-removable ground anchor is reversed to the state where the tension member can be removed. The hassle of checking the coupling between the fixture and the tension member is also eliminated.

Claims (1)

The main body 1 formed in the order of the screw cap fastening screw 14, the locking ring ring jaw 15 and the wedge assembly 11 for the wedge assembly from the inner end to the rear end, and the membrane groove 21f inside the wedge 21. There is a tension member membrane (7) and the wedge opening ring (6) is inserted into the opening ring groove (21g), the wedge locking ring (5) is fitted into the outer locking ring groove (21d), and the locking groove behind the locking ring groove (21d) A wedge assembly (2) consisting of a plurality of wedges (21e) formed thereon, a screw cap (3) having screws (32) fastened to the screws (14) of the main body (1), and the wedge seat (11). In the wedge separation membrane 9 placed between the wedge 21 and the wedge 21, a ring cone 21a is formed at the tip of the wedge 21 to insert a wedge safety ring, and the tip as the wedge assembly 2 is secured. The ring support 8 is fitted, and the ring cone 21a as the wedge assembly 2 is fitted with a wedge safety ring 4 for preventing the retraction of the wedge assembly 2 and the screw cap 3 The rear end inner edge is wedge safety ring 4 inside the fixing member for the tension member removal-type ground anchor, it characterized in that the inclined plane formed in a press (33).