KR100412035B1 - Ground anchor capable of anchoring and removing tension members - Google Patents

Abstract

The present invention is to provide a tension member fixing and removal type ground anchor that can easily remove the tensile material by manpower without fabrication and assembly performance improvement, light weight, improved reliability of removing the tensile material, and a dedicated drawing machine according to the reduction of the number of parts, Two or more tension members inserted into the rear end of the main body are clamped by wedges in the main body and operated outside the anchor hole to release the wedge bit for the tensioning material so that the tension member can be removed. An electric heating element 22 having a bearing saddle step 11 formed therein is formed on the stepped hole 11, and a wire hole 12 for penetrating the wire of the wedge tube support is connected to the thermally decomposable thermoplastic resin 21. A wedge tube 3 having a donut-type wedge tube support 2 embedded therein is seated on the step 11 and a tapered hole 33 is formed with wedge grooves 34 or less in a semicircle at each circumference. The wedge 4 is inserted into the sieve 1 and placed on the wedge tube support 2, and the wedge groove 4 having the same number of wedge grooves 42 as the wedge groove 34 is formed on the tapered surface 41 of the outer circumference. It is inserted into the barrel (3) and seated on the wedge barrel support (2), the cover (5) is fixed to the front end of the main body (1) and the bolt (6) in the bolt hole 51 perforated in the middle of the cover (5) ) Is fastened to the upper end of the wedge (4).

Description

GROUND ANCHOR CAPABLE OF ANCHORING AND REMOVING TENSION MEMBERS}

Ground anchors (aka earth anchors) are widely used in the earthwork method required for earthquake construction, which prevents the ground from collapsing while performing excavation work for underground structures to construct or build construction and civil structures.

Ground anchors for this purpose include compression type, tension type and acupressure type. Tensile ground anchors are the most widely used type of ground anchors, but they cannot remove the tension member, and they are difficult to remove because the ground anchors are constrained by tip pressure.

In addition, in terms of securing the anchoring force, the tension-type anchor anchor is reduced in the anchoring force due to the tensile cracking of the grouting body over time, and the anchoring anchor is applicable only to the rock which is capable of tip acupressure.

In any case, ground anchors use anchoring materials (steel wires) with excellent tensile strength to insert anchor bodies into anchor holes drilled in the ground, and to secure the anchoring force by applying load to the free long end, and use the anchoring force to drill deep underground. In order to secure safety at the time of construction, stabilization wall, ie, temporary earth wall, installed on the excavation surface will be stabilized.If the tension material is left in the ground after the construction work on the underground structure is completed, when the underground structure for the adjacent ground is constructed in the future As an obstacle to the construction, not only civil complaints occur, but also a construction cost for removing the tension member is added.

A ground anchor anchor is proposed to solve this problem. A representative example thereof is Patent Publication No. 96-4273. However, this prior art has the disadvantage that the increase in the number of components and the increase in manufacturing costs due to the addition of the tension pulling material, the drawing operation of the pulling material for pulling.

The present invention relates to a ground anchor that can fix and remove a tension member without a dedicated drawing machine. More specifically, the fabrication and assemblability is improved according to the reduction of the number of parts, the manufacturing cost can be reduced, and the tension member can be easily removed. Tension anchorage and removable ground anchors.

1 is an exploded exploded view of a ground anchor according to the present invention;

2 is a partial cutaway front view of the wedge support;

3 is a plan view of the wedge is inserted into the wedge container inserted into the main body;

4 is a longitudinal cross-sectional view of the anchor body with the tension member bitten;

5 is a situation diagram when the thermoplastic resin of the wedge tube support is initially pyrolyzed as the electric heating element is energized; And

6 is a situation diagram when the thermoplastic resin of the wedge container support is pyrolyzed to release the wedge bite for the tension member.

Accordingly, an object of the present invention is to remove the tension member easily without removing the sun wedge and the center member, the tension member for the center member traction, can be applied regardless of the ground, easy to manufacture and field assembly, fabric It is to provide a tension member fixing and removal ground anchor that can reduce the pore diameter.

In order to achieve the object of the present invention, the present invention forms an annular step that can seat the wedge tube support at the bottom of the inner circumferential surface, and the main body perforated the wire hole for drawing the wire drawn from the wedge support The outer diameter is a donut-type like the inner diameter of the main body, and the wedge tube holder is embedded in a thermoplastic resin that is thermally decomposed and melted or vaporized when subjected to high heat, and the wire connected thereto is drawn out to the bottom of the wedge tube support. The wedge can be seated on the step and the wire is drawn out by the wire worker, and the wedge canister is formed in the wedge canister with the semicircular wedge groove formed on the tapered inner circumferential surface. Wedge grooves are formed to be inserted into the wedge can be inserted into the wedge groove for each of the wedge grooves to match each other, The inner peripheral surface of the tip member is covered and provides a tension member fixing and removal-type ground anchor which by inserting a bolt in the middle of fastening the wedge.

As a result, the solar wedge, the core material supporting it, the tension member for the towing of the core material and the detachable piece wedge are excluded, so the number of internal parts is simple, the structure is simple, fabrication and assembly is easy, and it is light and easy and reliable only by manpower without using a dedicated drawing machine. It is possible to provide a ground anchor that can remove the tension member.

In addition, unlike the conventional anchor body in which the wedge is applied to each wedge seat, the wedge is reduced and the outer diameter of the wedge can be reduced by the size corresponding to the volume of the conventional wedge. It is possible, and also according to this, the hole diameter of the anchor hole is small, so that the drilling operation is easy and the drilling cost is also reduced.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In Fig. 1, the fixing agent for removing the tension member of the ground anchor of the present invention is composed of a main body 1, a wedge container support 2, a wedge container 3, and a wedge 4 and a cover 5.

The main body 1 is a kind of flat pipe having a front and back drilled, and an annular stepped 11 is formed at the lower end of the inner circumferential surface, and an electric wire hole 12 drilled in the axial direction is provided on the stepped 11 and the stepped 11 at the rear end. ) And a concentric circular threaded connection groove 13 for fastening the inner body, and an outer thread 14 for fastening the cover to the upper end of the outer peripheral surface. The step 11 is a seat where the wedge tube base is seated, the wire hole 12 is a hole through which the wire of the wedge tube base passes, and the lower body connecting groove 13 has a cement paste placed in an anchor hole on the outer circumferential surface thereof. It is used to connect to the rear of the fixing body to increase the friction force, and the tension material hole 15 inside thereof is a fastening part for fastening by inserting a polyethylene resin hose that prevents foreign substances such as cement milk (grout material) or earth and sand from entering. .

The wedge tube support 2 includes a thermoplastic resin 21, an electric heating element 22 enclosed in the thermoplastic resin 21, and an electric wire 23 coupled to the electric heating element, which is an electric wire of the body. It passes through the ball 12 and extends outward.

The thermoplastic resin 21 is a resin that is maintained as a very solid solid at room temperature and is thermally decomposed and melted or vaporized once subjected to high heat. Such resins include polyamide-based MC nylon (trade name), polyacetal resins, polycarbonate resins, and the like.

The electric heating element 22 is a heating source for heating and thermally decomposing the thermoplastic resin 21, and is attached to the bottom surface of the thermoplastic resin 21 or placed in a mold when the thermoplastic resin 21 is molded to be integrated.

The electric wire 23 is connected to the external power source and drawn to the outside of the anchor hole to energize the electric heating element 22. The electric wire is a coated wire coated with tough resin.

In other words, the thermoplastic resin 21 has to sit without leaving any gap between the step 11 and the inner circumferential surface of the upper main body 1 and the bottom of the wedge container 3, and tolerates the high fixing load transmitted through the tension member. It is desirable to perform precise processing so as not to push out into the gap.

The wedge tube support 2 has an outer diameter equal to the inner diameter of the main body 1 and an inner diameter equal to the outer diameter of the lower end of the wedge tube 3, so that the wedge tube support 2 is tightly sandwiched between the main body 1 and the wedge tube 3, thereby providing a high fixing pressure. In addition, the thermoplastic resin 21 crushed by this is prevented from escaping into the gap between the main body 1 and the wedge tube 3.

The reason is this. That is, in the initial stage when the electric heating element 22 is energized, the surrounding thermoplastic resin 21 is first thermally decomposed and escapes to prevent contact between the electric heating element 22 and the main body 1 and the wedge tube 3 to insulate it. .

In addition, it is not necessary to apply the insulator 24, since the residuals that are not pyrolyzed also serve as the insulator, but should be applied when a short circuit is feared in case of emergency.

In FIG. 1 again, the wedge barrel 3 restrains the tip of the tension member sandwiched between the wedge 4 in the body 1 and then sits down when the wedge holder base 2 is pyrolyzed to reduce the volume, In order to help the tension member to be reversed to a recoverable state when the binding force is lowered, the outer diameter is equal to the inner diameter of the main body 1 and the tube axis 31 given below the outer peripheral surface is made to be the same as the inner diameter of the step 11 so as to be closely inserted. , Where the tube shaft 31 is to start to give the step (32). The step 32 is a flat surface corresponding to the top surface of the wedge tube support 2 corresponding to the step 11 of the main body 1. In addition, the upper half of the inner circumferential surface is a taper hole 33, and a wedge groove 34 having a semi-circle shape or less is formed at the place where the circumference of the taper hole 33 is equally divided to cooperate with the wedge groove 42 of the wedge 4 side. To fix the tension member.

The wedge 4 is to press and fix the tension member enclosed in all the wedge grooves 34 of the wedge barrel 3 at the same time to the outside, the tapered surface 41 of the outer circumference having the same gradient as the taper hole 33 in the outer circumference By forming the same number of wedge grooves 42 or less in the semicircle corresponding to the wedge grooves 34 in the same number, the tension member is a monolithic form, and the screw grooves 43 are formed in the center of the horn protruding from the center of the upper surface. It is inverted conical to fasten to the cover (5) with a bolt.

The lid 5 stabilizes the wedge 4 while the tension member is sandwiched between the wedge container 3 and the wedge 4 and the thermoplastic resin 21 of the wedge container support 2 is thermally decomposed to reduce the volume. When the wedge container 3 sits down, it prevents the wedge 4 from following the wedge container 3, and when the anchor is inserted into the anchor hole until the recovery of the tension material, As a function of preventing foreign matters from entering the ground, such as rubble and gumfire, the inner screw 52 for fastening to the outer thread 14 given to the upper part of the main body 1 is provided.

In addition, if the cover 5 moves while the wedge 4 is fixed to the cover 5, the wedge 4 may flow and the fixing state of the tension member may become unstable, and the thermoplastic resin 21 is thermally decomposed. As the volume decreases, a screw groove is formed in the horn formed in the center of the upper surface of the wedge 4 by drilling the bolt hole 51 in the center of the plate to fix the movement with the wedge container 3. To (43).

In addition, the inner diameter of the bolt hole 51 is larger than the head of the bolt 6, and the outer surface of the bolt hole 51 forms an angled tube cap 53, such as a bolt head or a nut, to facilitate fastening of the bolt 6. When the wedge 4 pulls the bolt 6 in the tensioning direction due to the tension member applied when the wedge 4 is fixed to the cover 5 with the bolt 6, the bolt 6 is tensioned. The spacing ring when the low-elastic spacing ring 7 fitted under the head of the bolt 96 is crushed under the tension in order to prevent loosening of the original strong tension bite by the wedge 4 by providing a clearance to move in the direction. (7) This leaves room to be pushed aside.

With reference to FIG. 4, the assembly procedure which pinches a tension material to an anchor body is demonstrated.

The wedge cylinder base 2 into which the electric wire 23 is moved to the rear end is inserted into the main body 1, which contains nothing, and is seated on the step 11. At this time, the wire 23 is pulled out by the wire hole 12 to connect the coated conductive wire (e) having a length of more than the anchor hole, and the wedge cylinder (3) is put on the wedge cylinder support (2) to sit.

On the other hand, the tension member (a) has the same number as the wedge grooves (34, 42), and through the tube shaft 31 of the tension member hole (15) and the wedge tube (3) given to the rear of the main body 1 of the bundle of tension member (a) After the tip is pushed in, one wedge groove (34) is seated by one strand of tension member (a).

Subsequently, the wedge 4 is inserted into the wedge groove 34 of the wedge tube 3 so that the wedge groove 42 coincides with the wedge groove 42. When the wedge 4 is tensioned in the insertion direction, a clamping load equal to or greater than the fixing load of the tension member is applied to bite the tension member a, and the cover 5 is placed on the tip of the main body 1. At this time, it is stable to bring the bottom of the lid 5 into close contact with the upper surface of the wedge 4. This is because if the cover 5 does not contact the wedge 4, the wedge 4 may recede toward the cover 5, and the force after the door of the tension member a is weakened.

Then, the bolt 6 having the spacer ring 7 inserted under the head is inserted into the bolt hole 51 of the cover 5, and fastened to the screw groove 43 of the wedge 4, and the edge of the bolt hole 51 is fixed. A gap is waterproofed by the sealing material 8a at the edge of the fastening part with the main body 1.

On the rear side of the tension member 8a, a synthetic resin tube (c) is covered to cover all the tension members (a) at once. The tip of this synthetic resin tube (c) is pushed into the tension member hole (15) of the main body (1) to enter the tube shaft (31) so as to be sandwiched between the gap with the tension member (a). At this time, the sealing material 8b is inserted into the outer surface of the distal end of the synthetic resin tube c so that the water may flow into the outer circumferential surface of the synthetic resin tube c so as to be caught on the inner edge of the lower end of the tube shaft 31. It is prevented from penetrating into the wedge tube 3 so that the wedge grooves 34 and 42 and the tension material a bited therebetween are not corroded. This is because when the wedge grooves 34 and 42 and the portion of the tension member (a) bitten therein are corroded, they may stick to each other and may not be drawn out later.

Finally, the C ring (b) and the tubular inner body (d) are inserted into the outer surface of the synthetic resin pipe (c), and the end of the lower body (d) is fastened to the lower body connecting groove 13 of the main body 1 by the C ring. Press (b). The C ring (b) pressed by the load bearing body (d) is pinched between the tension hole (15) and the synthetic resin pipe (c) while acting as a water barrier. According to the waterproofing role of the C ring (b), the safety of the wedge holder (2) and the wedge holder (3) and the tension member (a) clamped therein is not subject to the thermal decomposition of the energized wedge holder (2). safe.

Next, a method of removing the tension member will be described with reference to FIGS. 5 and 6.

The anchor body, which is bound to the grout in the anchor hole, receives a strong tensile force at the time of anchoring, and is fixed as a separate anchor head, that is, an external anchorage, at the fixed end of the ground, earth wall, earth wall pile, or belt supporting the anchor body. . Follow-up or after the ground anchors have been used to prepare for removal of the tension member.

When the conducting wire e connected to the electric wire 24 and drawn out to the external fixing unit (not shown) is electrically connected to an external power source, the electric heating element 22 generates heat to thermally decompose the thermoplastic resin 21. The thermoplastic resin 21 is softened toward the outer portion at the portion in contact with the electric heating element 22 to gradually be thermally decomposed to melt or evaporate, and some of the thermoplastic resin 21 is changed to a liquid phase to generate fluidity.

The thermally decomposed thermoplastic resin (21a) is pressed by the force pulled by the tension force applied to the tension member (a) is pushed out of the gap between the remaining electric wire hole 12 is occupied by the electric wire is taken out of the main body (1) It accumulates in the lower space 15. And the thermoplastic resin 21 is melted and reduced by the amount of the outflow volume and the volume decreases, the wedge container 3 is subject to the tension of the tension member (a) to fall. However, since the wedge 4 is fixed to the cover 5 fixed to the main body 1 with the bolt 6, the wedge 4 does not follow the wedge container 3 that sits down and stays intact without departing from the original position.

This change is followed by the wedge barrel (3) and the wedge (4) between the gap, the wedge groove (34, 42) the force holding the tension member (a) is gradually weakened. When the wedge bite falls below the tensile force acting on the tension member (a), the tension member (a) starts to slide in the direction in which the tension member (a) contracts in the wedge grooves (34, 42).

Then, at the moment when the elongation according to the settling load of the tension member (a), that is, the contraction force, surpasses the bite pressure established between the wedge barrel (3) and the wedge (4), the tension member (a) is extremely instantaneously wedge grooves (34, 42). ) And slide out and stay in the plastic pipe (c). The tension member staying in the synthetic resin tube (c) is so free that it can be easily pulled out by a single person outside the anchor hole. Thus, the tension member can be removed without having to mobilize heavy equipment such as a drawing machine or a crane.

When removing the tension member of the anchor disappearing tension force Buick is removed by applying a predetermined tension force using a tensioner.

According to the present invention as described above, the thermal decomposition of the thermoplastic resin by the energization of the electric heating element is discharged in place by the settling load of the tension member acting on the wedge tube and the volume is reduced while biting the wedge while the wedge container is down. The wedge and the support for the tensioning material of the ground anchor is a tension anchor for the ground anchor which is released from the wedge groove due to the contraction action caused by the anchoring load, which causes the tension member to be removed. The core material, the tension member for the towing of the core material, and the detachable piece wedge are excluded, so the number of internal parts is simple, the structure is simple, the fabrication and assembly are easy, and the weight can be easily and reliably removed by manpower without using a dedicated drawing machine. You can provide a ground anchor.

In addition, unlike the conventional anchor body in which wedge-shaped wedges are applied to each wedge seat, the one-piece wedge that excludes the sculpted wedge and pushes all the tension members at one time reduces the outer diameter of the wedge container corresponding to the volume of the conventional wedge. And it is also very useful invention, such as to give a profit, such as the hole diameter of the anchor hole is also reduced to facilitate the drilling operation and the drilling cost is reduced.

Claims (2)

In the two or more tension members inserted into the rear end of the main body by biting the wedge in the main body and by the operation outside the anchor hole to release the wedge bite to the tension member to enable the removal of the tension member, At the bottom of the inner circumferential surface of the body to form a wedge barrel saddle stepped, On the step, drill the electric wire for penetrating the wire of the wedge support. A donut-shaped wedge tube holder in which an electric heating element in which a wire is connected to a thermally decomposable thermoplastic resin is embedded is placed on the step, In the taper ball, insert a wedge tube formed with wedge grooves of semi-circle or less in each place where the circumference is divided into the main body, and put it on the wedge tube support. Insert a monolithic wedge formed with the same number of wedge grooves on the tapered surface of the outer circumference into the wedge tube to sit on the wedge support, A tension anchor fixing and removal type ground anchor, characterized in that the front end of the wedge by fastening the cover to the front end of the main body and a bolt inserted into the bolt hole perforated in the cover of the cover. The method according to claim 1, The thermoplastic resin is a polyamide-based MC nylon, polyacetal resin, polycarbonate resin, characterized in that the tension member fixing and removal type ground anchor.