KR100435069B1 - inner fixing device for a tension member removetype ground anchor - Google Patents

Abstract

The present invention transports the ground anchor assembled to the body by biting the tip of the tension member to the wedge assembly in the assembly plant to stabilize the wedge bite for the tension member until it is fixed in the anchor hole to increase the assembly reliability of the tension anchor of the ground anchor In order to provide a removable internal fixing body, the main body 1 formed in the order of the screw cap fastening screw 14 and the ring jaw 15 and the wedge assembly 11 for the wedge assembly from the inner end to the rear end, and the wedge ( 21) The wedge assembly ring (2) in which the wedge opening ring (7) is inserted into the open ring groove (21f) inside and the wedge constriction ring (6) is inserted into the outer ring ring groove (21d), respectively, and held in a combined state, and the screw A thread cap 3 having a screw 31 corresponding to (14), and a threaded inner thread 42 of the screw cap are formed on the front surface of the seat 41, and a tension member cap covering the tension member on the rear surface of the seat 41. A horn screw (4) with (43) and the wedge In the wedge separation membrane 8 settled in (11), the wedge 21 in which the wedge safety ring ring horn 21a was formed at the front end, and the ring horns 21a after the wedge assembly 2 became temporary. Wedge safety ring (5) is inserted into the front of the wedges (21), and a screw cap (34) formed at the inner edge of the rear end by pressing the front edge of the wedge safety ring (5) seated on the ring jaw (15) ( It is characterized by the configuration of the internal fixing body for the tension member removal ground anchor consisting of 3).

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 earth wall side stripe side It relates to an internal anchorage for ground anchors that allows the wedge assembly to recede 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 drawer. The present invention relates to a tension member-removable internal anchoring body for ground anchors, which has improved assembly reliability by stabilizing wedge bites for tension members until the anchors are transported to the site by grounding the ground anchors assembled on the main body.

The inner fixing body for the horn screw-type tension member-removable ground anchor of Patent Application No. 2001-26495 and the registered utility model No. 249170 of the present invention is assembled by inserting a long tension member tip from the back of the wedge assembly and being bitten by the wedge assembly in the main body. After moving to the place of storage in the assembly plant, rolling round to fit the vehicle, unloading at the construction site, inserting into the anchor hole, etc. The wedge assembly may retract and the wedge bite may loosen.

When the wedge bite of the wedge assembly of which the tip of the tension material is bitten is loosened, the function of the internal fixing is lost. If the construction site finds that the wedge bites of the tension member have been loosened, it may be difficult to open the screw cap, pull out the wedge assembly, and then reassemble by re-engageing the tip of the tension material. If this is found after construction, it is not easy to get the horn screw out of the screw cap by turning the outer end of the tension member in the reverse twist direction.

Thus, the external anchorage of the tension member is released and the horn screw tension member removal ground anchor configured to remove the tension member by pulling the wedge assembly and releasing the wedge bit with respect to the tension member by holding the outer end of the tension member and engaging the horn screw to the screw cap. The internal fixation for the dragon is urgently required to take special measures to prevent the wedge bite of the tension member from loosening until the fixing.

It is an object of the present invention to provide an internal fixture for a ground anchor which can remain intact unless the wedge bite is intentionally released after the tip of the tension member is fitted into the wedge assembly in the manufacturing plant.

The problem is that after the fixing of the outer end of the tension member is released, by grasping the outer end of the tension member, the wedge assembly is pulled while the horn screw is fastened to the screw cap, and the wedge of the tension member can be released to remove the tension member. In an internal anchor for a ground anchor, a C-type wedge safety ring is inserted into a ring horn at a tip of a wedge assembly which bites the tip of a tension member, thereby preventing the wedge from being retracted without being opened, and in this state, it enters the wedge seat of the main body. When seated and the screw cap is fastened to the tip of the main body, the front edge of the wedge safety ring is caught between the ring chin of the main body and the tip bevel of the screw cap to prevent unauthorized retraction of the wedge assembly, causing the tension member and the internal fixture to swing during handling, transportation, and construction. Removal of the tension member of the present invention to maintain the wedge bite on the tension member tip unchanged even when This can be achieved with internal fixtures for mold ground anchors.

Insert the internal fixture into the anchor hole in the underground, grout and fix it, and then tension the tension member. The wedge assembly is drawn to the tension member and advanced toward the rear end of the main body, intensively quenching the tension member. As the internal bearing force disappears, the wedge safety ring is retracted by its elasticity, falling out between the ring jaw of the body and the bevel of the screw cap and falling into the screw cap. After the wedge safety ring hanging in front of the wedge assembly disappears, the outer end of the tension member is cut to remove the tension to construct the underground structure and to remove the earth wall, and the wedge assembly is pulled back by pulling the outer end of the tension member to There is no jolt when releasing wedge bites. Thus, as in the prior art described above, the tension member can be easily removed with only the hand force or the hand spanner.

1 is an example of the use of the ground anchor

Figure 2 is a front view of the internal fixture for the tension member removal ground anchor according to the present invention.

3 is an exploded view of the copper

4 is a perspective view of the horn screw

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;

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

1 body 2 wedge assembly

3: screw cap 4: horn screw

5: wedge safety ring 15: ring chin

21: Wedge 21a: Ring Horn

34: slope

In Figure 1, the tension member removal ground anchor installed to stabilize the earth wall (F) is inserted into the anchor hole (C) of the ground by inserting the tip of the tension member (A) to the internal fixing member (B) and anchor hole (C) After the grout material (E) is filled and fixed, the tension member is fixed to the external fixing body (D) at the side of the strip installed on the earth wall (F).

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 Figure 3, the internal fixing agent for the tension removing ground anchor is a body (1) and wedge assembly (2), screw cap (3), horn screw (4), wedge safety ring (5), wedge retracting ring (6) , The wedge opening ring 7, and the wedge separation membrane 8.

The main body 1 is tubular, and the rear end of the inner circumferential surface is a wedge seat 11 tapered by the beneficiation post-negotiation, and the front end of the tension member which is covered with a flexible synthetic resin tube in the center of the rear end of the main body 1 of the wedge seat 11. A tube groove 12 is also formed to which 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 ring jaw 15 located at the tip of the margin 13 is also provided.

The wedge assembly 2 is composed of a plurality of wedges 21 divided into two or three circumferences. A ring cone 21a for fitting the wedge safety ring 5 is formed on the front end face of the wedge 21. In addition, the outer circumferential front end portion 21b of the wedge 21 has a face similar to that of the clearance 13 of the wedge seat 11, so that there is enough space for the wedges 21 to open when the wedge is later released. There will be room to spare. This is necessary to ensure sufficient space to back off and open when the external anchorage to the tension member is released.

The second half of the wedge 21 has a tapered surface 21c so as to correspond to the wedge seat 11. The tapered surface 21c plays a role of strongly squeezing the tension member as the wedges 21 are pulled toward the rear end of the wedge seat 11 with the tip portion of the tension member when tensioning the tension member. Moreover, 21 d of semi-circular recessed ring grooves are formed in the circumferential direction in the outer surface of the front-end | tip part 21b of the wedge 21. As shown in FIG. The catching ring 21d is for keeping the assembled state of the wedge assembly 2 by inserting the wedge catching ring 6. The inner surface of the wedge 21 is formed with a sheet groove 21e and a backing ring groove 21f behind it. The seat groove 21e is for the seat 41 of the horn screw 4, and the open ring groove 21f is for the wedge opening ring 7 for opening the wedge 21.

The opening ring groove 21f is placed behind the locking groove 21e. This is necessary to make it easier for the wedge opening ring 6 to be unloaded when the anchorage of the tension member is released and the wedge assembly 2 withdraws.

The screw cap 3 is fastened to a given screw 14 at the tip of the main body 1 to protect all the internals of the main body 1, and at the same time until the internal fixture is fixed and tension is applied to the tension member. By confining the wedge safety ring 5 jointly with, the head 32 which is easily twisted by a spanner is formed in the center of the front end surface. Moreover, the outer thread 31 corresponding to the screw 14 of the main body 1 is formed in the outer surface of a rear end part, and the internal thread 33 for horn screw fastening is also formed in the center of an inner surface.

The inner edge of the rear end of the screw cap 3 is an outwardly tapered comb face 34. The wedge 21 is temporarily wedged by pressing the front edge of the wedge safety ring 5, and wedges 21 which have been squeezed by the tension member when the tension member is tensioned in the internal fixing body fixed in the anchor hole. When the ring cone 21a of the wedge safety ring (5) disappears the internal support force for the wedge safety ring (5) is retracted by its elasticity so that it can easily come out between the screw cap (3) and the ring jaw (15) It is a necessary component.

Referring to FIG. 4, the horn screw 4 leads the wedge assembly 2 and screws when the tip grips and rotates the outer end of the tension member in the state where the external fixation to the outer end of the tension member bitten by the wedge 21 is released. Retaining the wedge assembly 2, which is retracted and fastened to the internal thread 33 of the cap 3, and the wedge bite is fixed. The seat 41 to be fitted into the seat groove 21e and the upper surface of the seat 41 are fixed. It consists of a screw 42 formed in the center and fastened to the internal thread 33 of the screw cap 3, and a tension member cap 43 formed integrally with the bottom surface of the seat 41 and covering the tip of the tension member.

The seat 41 is to guide the wedge assembly (2) when twisting the tension member released external fixation to one side to fasten the screw 42 to the inner screw 33 of the screw cap (3). In addition, the tension member cap 43 is for turning the threaded horn 4 in the direction when the tension member is twisted in the twisted state in the state where the tip of the tension member is fitted, and therein, a regular hexagonal groove 44 is formed to fit the tension member. When the tension member is turned in the tension member cap 43, even if the tension member is turned, the horn screw 4 does not turn along, so it cannot be fastened to the screw cap 3.

3 again, the wedge safety ring 5 surrounds the front of the wedge assembly 2 while simultaneously enclosing the ring horns 21a of all the wedges 21 constituting the wedge assembly 2 so as not to open. After assembling the fixture, it is temporarily locked so that the wedge bite of the tension member by the wedge assembly (2) remains unchanged even when external forces such as the fluctuation of the tension member and external impact are applied until the tension is applied to the anchor hole. The inner diameter of the wedge assembly 2 is smaller than the radius of the ring cone 21a of the wedge assembly 2 and the outer diameter is a C-shaped elastic ring smaller than the inner diameter of the screw cap 3.

The wedge retracting ring 6 is a rubber O-ring that collects a plurality of circumferentially divided wedges 21 and maintains a combined state. Wedge opening ring (7) is to open the wedge (21) to release the tension member held by the contrary to the wedge retracting ring (6), which collects a plurality of circumferentially divided wedges (21) together to maintain a combined state, C type It is a metal ring.

The wedge separator 8 is subjected to strong tension on the tension member so that the door wedge 21 does not stick to the wedge seat 11 so that the wedge assembly 2 at the wedge seat 11 is formed by the reaction force of the tension member when the external fixation is released. ) Is a non-adhesive flexible material, such as a fan-shaped synthetic resin film cut to fit the wedge seat (11) to help slip easily.

Fig. 5 is an assembled sectional view 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. First, the two-segment type, two wedges 21, and the three-segment type, three wedges 21 are arranged in the circumferential direction, and the wedge-opening ring 7 is drawn in the open ring groove 21f of the wedge 21. The seat 41 of the horn screw 4 is inserted into the seat groove 21e, and the wedge retracting ring 6 is inserted into the retracting groove 21d to have the shape of the wedge assembly 2.

The wedge separation membrane 8 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 8 is placed. A tension member A is inserted toward the rear end so that its tip contacts the seat 41, and the wedge safety ring 5 is enclosed on the outer surface of the ring horn 21a as the wedge assembly 2. The tube G is fastened to the tube groove 12 by fastening the ring nut K to the end thereof and fixed to the tension member A. If necessary, a ring packing (L) may be added in front of the ring nut (K).

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 tip of the wedge 21 and the back of the ring tuck 15 and the wedge safety ring 5 lie on the same line and the front edge of the wedge safety ring 5 is pressed against the comb face 34 of the screw cap 3 and the screw ( The tip of 42 is slightly separated from the rear end of the inner screw 33, thereby precluding the possibility that the screw 42 can be tightened to the inner screw 33 due to the fluctuation of the tension member, the external impact, etc., thereby preventing the safety of the wedge bite. To raise.

In the internal fixer thus assembled, the wedge safety ring 5 hangs on the tip of the wedge assembly 2 and prevents it from retreating. This state is maintained after assembling the internal fixture and inserting and anchoring in the underground anchor hole of the construction site until a considerable tension is applied to the tension member (A). In this way, 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 during handling, transportation, and construction and the shaking of the tension member (A). High reliability of tension wedge bite for.

This stable wedge stitching of the tension member to the internal fixture is not only an important factor in improving the construction quality of the ground anchor, but also the wedge assembly of the tip of the tension member (A) prior to inserting the internal fixture into the underground anchor hole at the construction site. It is convenient to escape from the hassle of having to check whether or not the wedge bite of (2) has been maintained reliably.

Insert the internal fixing body into the anchor hole, fill the grout material to fix it, and then apply tension to the tension member (A) .The main body (1), the screw cap (3) and the wedge safety ring (5) do not stand in place. The wedge assembly 2 bites the front end of the tension member A and is pulled in the tension direction, thereby pulling in the center direction by the induction of the wedge seat 11 so as to bite the tension member A more strongly.

In Fig. 6, the ring cone 21a of the wedge 21, which has been moved in the tensioning direction, comes out of the wedge safety ring 5 someday. The yield load of 12.7mm strand wire used as a ground anchor tension member is slightly over 15 tons, and the settling load reflected in the design when used as a ground anchor tension member is generally 10 to 12 tons. As a result of the experiment, it was confirmed that the ring cone 21a of the wedge 21 is pulled out of the wedge safety ring 5 around 1.5 to 2.5 tons when the tension member A is tensioned and fixed.

When the ring cone 21a is released from the wedge safety ring 5, the wedge safety ring 5 retracts elastically due to its elasticity and the inclined surface 34 of the screw cap 3 being pushed toward the center direction. Then, when the outer diameter is smaller than the inner diameter of the screw cap 3, it is pulled out between the screw cap 3 and the ring jaw 15 and falls into the screw cap 3. After the wedge safety ring 5, which prevents the wedge assembly 2 from retreating, disappears, the wedge assembly 2 changes to a situation where it can be retracted at any time.

Next, insert the internal fixing body at the tip of the anchor hole, fill the grout material to fix it, tension the tension material (A), fix it on the earth wall (F), finish the necessary construction, and remove the tension material (A). This will be described with reference to FIGS. 7 and 8.

In Fig. 7, 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 somehow, the tension member A is pushed toward the tip by the reaction force of the same magnitude as the tension. The tension member A is pushed out and the sheet 41 is pushed. At this time, the seat 41 attracts the entire horn screw 4 and the wedge assembly 2. The distance drawn is such that the tip of the screw 42 touches the rear end of the internal thread 33. At this time, the wedge assembly 2 is also drawn toward the front end of the main body 1.

In Fig. 8, in the state changed as described above, the outer end of the tension member (A) is grasped and twisted in the twisting direction. Then, the screw 42 of the horn screw 4 is engaged with the inner screw 33 of the screw cap 3 to pull the wedge assembly 2. At that time, the wedge opening ring 7 opens the wedges 21. Thereafter comes the time when the tension member A is idle. This is a state in which the tension member A is released from the wedge assembly 2, that is, the wedge bite is released. After the wedge bite of the tension member A by the wedge assembly 2 is released, the tension member A contained in the tube G is simply pulled by the outer end of the tension member A from the inside of the earth wall F. ) Is easily removed and removed.

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 seated on the wedge seat of the main body by inserting the tip of the tension member and the screw cap is assembled to the front end of the main body, the wedge safety ring prevents the wedge assembly from retreating between the main body and the screw cap. By adding the supporting safety ring support, it is possible to stabilize the wedge bite of the tension member by the wedge assembly until it is transported to the site after assembly of the internal fixture and inserted into the underground anchor hole to fix and tension the tension member. .

Therefore, the wedge bite reliability of the tension member of the inner fixing body for the tension member-removable ground anchor which releases the outer fixing of the tension member and retracts the wedge to release the wedge bite is improved, and the inner fixing member and the tension member and The hassle of checking whether the coupling state is defective is also eliminated.

Claims (1)

Wedges are formed in the main body 1 formed in the order of the screw cap fastening screw 14, the ring jaw 15, and the wedge seat 11 for the wedge assembly, and the opening ring groove 21f inside the wedge 21. The wedge assembly 2, in which the ring ring 7 and the wedge retracting ring 6 are fitted into the outer retracting ring 21d and held in a combined state, respectively, and a screw 31 corresponding to the screw 14 is provided. The formed screw cap (3), and the horn screw (4) is formed on the front surface of the sheet 41, the inner thread screw 42 of the screw cap is formed, and the tension member cap 43 is formed on the back of the sheet 41 to cover the tension member; In the wedge separation membrane 8 placed on the wedge seat 11, the wedge 21 having a ring cone 21a for a wedge safety ring is formed at the tip, and the ring cones 21a after the wedge assembly 2 are formed. Pressing the front edge of the wedge safety ring (5) hanging in front of the wedges (21) and the wedge safety ring (5) seated on the ring jaw (15) An internal fixing body for a tension member-removable ground anchor, comprising a screw cap (3) having a comb surface (34) formed at a rear inner edge.