KR102588420B1 - A ground reinforcement member for removing tension member using repulsive force and restraint of a wedge, and a method for removing tension member - Google Patents

Abstract

The present invention relates to a tension member-removable ground reinforcement using reaction force and wedge restraint and a method for installing and removing the tension member. It is used in panel-type cut retaining walls or temporary earth retaining facilities, and when the tension member advances toward the anchorage head when the tension member is removed. The purpose is to assist in rapid removal of the tension member by providing a repulsive force (force directed toward the ground) to the tension member and to easily remove the tension member with a single operation without malfunction by restraining the wedge to separate from the tension member.
The tension member-removable ground reinforcement using the repulsion force and the restraint of the wedge according to the present invention includes an anchoring head (10) having a space inside that is open toward the rear; a wedge 30 inserted into the space of the fixing head; A tension member (20) whose tip is detachably connected to the wedge; It includes a housing 40 coupled to the rear of the fixing head and supporting the wedge, and a spacer 50 mounted inside the fixing head to space the wedge at a certain distance from the inner surface of the fixing head. ; It is formed inside the fixing head to protrude toward the tension member, and when the tension member advances for removal, it restrains the advancement of the front end of the tension member without interfering with the advancement of the wedge, thereby separating the tension member from the wedge by a repulsive force. A repulsion rod (60) that guides as much as possible; and a wedge restraining means formed on the wedge and the repulsion rod to restrain the wedge from moving in the direction of removal of the tension member when the wedge advances by the tension member.

Description

A ground reinforcement member for removing tension member using repulsive force and restraint of a wedge, and a method for removing tension member}

The present invention relates to a tension member-removable ground reinforcement (anchor, soil nail, rock bolt, etc.). More specifically, it is used in cut-out retaining walls or temporary facilities to stably reinforce the ground and provide restraint between the wedge and the tension member when the tension member is removed. This relates to a tension material removal type ground reinforcement using the restraint of the wedge and the repulsion force that releases and generates a force in the removal direction on the tension member to easily and efficiently remove it, as well as a method of installing the same and removing the tension member.

This part only provides background information related to the content of this application and does not necessarily constitute prior art.

Ground anchors are installed in the ground to construct underground structures accompanying buildings or civil engineering work. For example, by excavating the ground, an earth wall is erected to prevent subsidence of the surrounding ground, and anchors are installed to secure the earth wall. It supports and can be divided into permanent anchors and removable anchors.

Permanent anchors have tension members permanently installed in the ground, whereas removable anchors have tension members removed after construction is completed.

In particular, in the case of permanent anchors, the tension material remaining in the ground is an underground obstacle, which can cause problems in development work in adjacent areas and cause problems with underground compensation rights.

Removable anchors are very useful and are being developed into a variety of technologies in that they can solve the shortcomings of permanent anchors.

Registration Patent No. 10-0418466 involves fixing the tip of one or more tension members inserted into the center of the rear end of the main body to the wedge seat of the main body by engaging the circumferentially split wedge assembly held in a combined form by an elastic ring. In the case of protection by putting a cap on the body, the outer ring intermittent ring tuck of the wedge assembly and the cap fastening screw are formed between the upper end and the tip of the wedge seat, the inner ring for opening, the stopper for retraction, and the outer ring that is peeled off when retracting. A wedge assembly with a wedge retraction stop groove to prevent the wedge from coming out of the tension member when the tension member is pulled out, and a stop groove for the wedge by removing the outer ring from the wedge when the wedge assembly retreats at the same time as the external fixation of the tension member is released. It is a fixture for a tension member-removable ground anchor consisting of a cap with the function of locking the tension member. When the external fixture is dismantled or the tension member just inside the external fixture is cut with a welder, etc. while the tension member is anchored, the tension member is used. When the tension member is pushed toward the tip due to a reaction, the wedge assembly is pushed and all the wedges are opened at once by the inner ring to release the engagement with the tip of the tension member on its own. Since the force separating the tension member and the wedge is weak, the tension member is removed. In addition, the principle that the outer ring is caught in the stop groove of the wedge by elastic force can cause malfunction in the stop of the wedge when the elastic force of the outer ring is insufficient or excessive, and not only is it difficult to securely connect, but the wedge may fall out again. You can.

In addition, patent documents for removable anchors have many configurations and complex coupling relationships, so they are expensive to manufacture and cause malfunctions.

Registered Patent No. 10-0418466

The present invention is intended to solve the problems described above. When removing the tension member, when the tension member advances toward the fixing head, a repulsive force (force directed toward the ground) is applied to the tension member, thereby helping to quickly remove the tension member. The purpose is to provide a tension material removal type ground reinforcement using the restraint of the wedge and the repulsion force that easily removes the tension member with a single operation without malfunction by restraining it to be separated from the tension member, and a method for installing and removing the tension member.

The solution principle of the tension member-removable ground reinforcement using the repulsion force and restraint of the wedge according to the present invention is that when the tension member is advanced toward the hollow floor to remove the tension member, it separates from the wedge and generates a repulsion force directed toward the ground to remove the tension member. It is formed inside the fixing head to protrude toward the tension member, and when the tension member moves forward for removal, it restrains the advancement of the tip of the tension member without interfering with the advancement of the wedge coupled to the tip of the tension member by a repulsive force. One of a repulsion rod that guides the tension member to separate from the wedge and a wedge restraining means formed on the wedge and the repulsion rod to restrain the wedge from moving in the direction of removal of the tension member when the wedge advances by the tension member. It is characterized by including the above.

According to the present invention, the tension member removal type ground reinforcement using the reaction force and wedge restraint and its installation and tension member removal method have the following effects.

When moving forward to remove a tension member, a repulsive force is applied only to the tension member that is to be removed without interference from the wedge, so the tension member is separated from the wedge more quickly, making removal of the tension member very easy.

In addition, when removing the tension member, the wedge is restrained from moving in the direction of removal of the tension member, and the organic combination of binding force and repulsion force allows the tension member to be easily and quickly removed with just one operation, thereby shortening the work time for removing the tension member. You can eliminate the inconvenience of performing multiple operations to separate the and wedges.

In addition, the simple structure of the repulsion bar and wedge restraint means reduces manufacturing costs and reduces malfunctions.

The present invention is very useful in panel-type cut-out retaining walls, earth retaining temporary facilities, etc.

Figure 1 is an exploded perspective view of a tension member-removable ground reinforcement using reaction force and wedge restraint according to the present invention.
Figure 2 is a cross-sectional view of a tension member-removable ground reinforcement using reaction force and wedge restraint according to the present invention.
Figure 3 is a process diagram of the installation and tension member removal of a tension member removal type ground reinforcement using the reaction force and restraint of the wedge according to the present invention.
Figure 4 is an example of a tensile material removal type ground reinforcement using the reaction force and wedge restraint according to the present invention being used in a cut retaining wall.
Figure 5 is an example of a tensile member removal type ground reinforcement using the reaction force and wedge restraint according to the present invention being used in a temporary facility.

In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. The terms described below are defined in consideration of the functions in the present invention, and may vary depending on the intention or custom of the user or operator. Therefore, the definition should be made based on the contents throughout this specification.

As shown in Figures 1 and 2, the tension member removal type ground reinforcement 100 using the repulsion force and restraint of the wedge according to the present invention is fixed to the anchoring head 10, the tension member 20, and the distal end of the tension member 20. and a wedge 30 inserted into the inside of the fixing head 10, a housing 40 coupled to the rear of the fixing head 10 and supporting the wedge 30, and a tension member 20 inside the fixing head 10. It includes a spacer 50 that secures space for movement of the tension member 20 and the wedge 30 to remove the tension member 20, and includes a repulsion rod 60 and a wedge 30 that help remove the tension member 20. It further includes wedge restraint means 70 (locking jaw 71 and restraining jaw 72).

In addition, the ground reinforcement material 100 of the present invention can be used in various applications such as cut retaining walls (panel retaining walls) and temporary earth retaining facilities, and when applied to cut retaining walls, the panel 80 supported on the cut surface (see Figure 4) Includes. As shown in Figure 4, the panel 80 is installed in front of the cut portion with a certain space, for example, through a concrete foundation block, and the ground reinforcement 100 is inserted into the drilling hole together with the anchorage 200, so that the ground side is It is fixed on the panel 80, and the space between the panel 80 and the cut includes, for example, backfill from the bottom: concrete filling - rubble filling - soil filling - concrete filling - soil filling. Figure 4 shows an example of a load distribution type with 6 strands of tension members.

Figure 5 shows an example in which the ground reinforcement 100 of the present invention is used in temporary facilities, and the tension member 20 of the ground reinforcement 100 is anchored after the ground side penetrates the earth plate 90, and other configurations It is the same as the cut retaining wall type.

The anchoring head 10, the tension member (for example, the PE coating 21) 20, the wedge 30, and the housing 40 have the same configuration as a known tension member removal type ground anchor, so they are only schematically described.

The fixing head 10 has a space inside that is open toward one side, and the head has a round shape, for example. The space secures a free space where the wedge 30 can be opened to separate the tension member 20.

The tension member 20 is any one of strands, steel bars, steel pipes, and reinforcing bars, and more than one can be used.

The wedge 30 is detachably coupled to the distal end of the tension member 20, and has a plurality (for example, two or more) of curved cross-sections with an inclined surface 31 formed on the outer peripheral surface, and the wedge piece 32 includes one or more elastic rings ( 33) to form a circle surrounding the tension member 20.

The wedge 30 is fixed to the tension member 20 through the wedge piece 32 and the elastic ring 33, but when an external force is applied, the elastic ring is elastically deformed, and the wedge pieces are spread and separated from the tension member 20. possible.

The housing 40 is cylindrical with a hole through which the tension member 20 passes, and its inner peripheral surface is equipped with an inclined surface 41 on which the inclined surface 31 of the wedge 30 is supported, and is attached to the fixing head 10, for example, in a screw type. can be combined

The spacer 50 is inserted into the fixing head 10 and one side is supported on the inner surface of the fixing head 10, while the other side is supported on the wedge 30 so that the wedge 30 is supported on the inner surface of the fixing head 10. It is designed so that it does not touch, and does not cause interference with the tension member 20 when the tension member 20 advances.

Preferably, the spacer 50 is made of a material whose volume is reduced by an external force (force applied as the wedge 30 advances) and does not have the force to return the wedge 30 to its original position. That is, the external force is It is made of a material that maintains its shrinkage state even when it disappears. For example, the spacer 50 is manufactured by processing a commonly used compression spring to a limit length beyond which elastic recovery is impossible and putting it into a plastic state. As another example, a carbon steel wire rod with a carbon content of 0.25% or less in the shape of a compression spring is manufactured. Mild steel wire rod (SWRM) is used as the spacer material. In this case, the installation height is maintained at normal times, but when an impact from an external force occurs, it does not return to the original height.

The spacer 50 is preferably coil-shaped. In this way, when the spacer 50 is formed in the form of a coil, there is a space inside, so the tension member 20 can be accommodated in this space without interference.

The repulsion bar 60 is configured to provide a repulsive force against the advancement of the tension member 20 to the tension member 20 while not restricting the advancement of the wedge 30, and allows the wedge 30 and the tension member 20 to be separated. It has a shape that protrudes from the inner surface of the fixing head 10 to secure space.

The repulsion bar 60 can have various cross-sections, such as circular or square, and includes an inclined portion 61 that guides the wedge 20 to spread around the head. That is, the repulsion rod 60 has a pointed head.

The repulsion rod 60 can be formed integrally with the fixing head 10 or assembled therewith.

In addition, the repulsion rod 60 is height-adjustable, so it is possible to change the location where the repulsion force occurs. For example, it is formed in the form of a bolt, so the height can be adjusted by screwing it to the female thread of the fixing head 10. .

The wedge restraining means 70 restrains the movement of the wedge 30 in order to separate the wedge 30 from the tension member 20 when the wedge 30 advances due to the advancement of the tension member 20, and preferably It consists of a locking protrusion 71 protruding from the inner peripheral surface of (30) and a restraining protrusion 72 formed on the head of the repulsion rod 60 and caught by the locking protrusion 71 to restrain the wedge 30. For example, the outer diameter of the repulsion rod 60 is smaller than the inner diameter of the wedge 30, and the locking protrusion 71 is formed to protrude toward the center, and the restraining protrusion 72 is formed on the outside (locking protrusion 71). ) is formed to protrude toward the structure so that the locking protrusion 71 and the restraining protrusion 72 are engaged with each other.

The locking jaw 71 and the restraining jaw 72 can be in the form of a ring formed entirely on the inner and outer peripheral surfaces, or in the form of a plurality of rings formed along the circumferential direction.

The restraining jaw 72 can also be formed on the circumference below the head of the repulsion bar 60.

The present invention is characterized in that the repulsion bar 60 provides a repulsive force to the tension member 20 and also functions as a wedge restraint means 70. Of course, the repulsion bar 60 can be used without the wedge restraint means 70. It can also be used alone.

The method of installing and removing the tension member removal type ground reinforcement using the repulsion force and wedge restraint according to the present invention is as follows (see Figure 3).

1. Drilling a hole ((A) in Figure 3).

Drill a hole (1) in the ground. The drilling hole 1 is drilled in accordance with the site conditions and is drilled into an optimal shape for installation of the ground reinforcement material 100 of the present invention.

When the drilling hole (1) is constructed to reinforce the cut portion, it is formed in the cut portion, and when used for temporary earth retaining facilities, it is drilled around the perimeter of the excavation space.

2. Inserting ground reinforcement (Figure 3(B)).

Insert and install the ground reinforcement material (100) into the drilling hole (1). At this time, the anchoring head 10 of the ground reinforcement 100 is located at the bottom of the drilling hole 1.

3. Anchoring ground reinforcement (Figure 3(B)).

The fixing head (10) is fixed through grouting, etc., filling the drilled hole (1) with filler.

4. Tension ((B) in Figure 3).

The tension member 20 is tensioned on the ground.

The present invention can also be re-tensioned for maintenance, etc.

5. Tension member removal (Figure 3 (C), (D), (E)).

In the state before this process, the tension member 20 and the wedge 30 maintain their initial assembled state, and the wedge 30 remains separated from the repulsion rod 60 through the spacer 50.

When the tension member 20 is advanced toward the fixing head 10, the tension member 20 and the wedge 30 advance together as shown in (C) of FIG. 3.

From the moment the locking protrusion 71 of the wedge 30 contacts the inclined portion 61 of the repulsion bar 60, the wedge 30 spreads along the inclined portion 61 as shown in (D) of FIG. 3 and is then restrained. When it passes through the jaw (72), it is gathered by the elastic ring (33).

In this process, when the tension member 20 collides with the repulsion bar 60, the forward movement of the tension member 20 is stopped, and as shown in (E) of FIG. 3, a repulsive force opposite to the forward force is generated in the tension member 20 and is pushed toward the ground. .

At this time, the wedge 30 can move backward together, but since the restraining jaw 72 is caught by the stopping jaw 71 and restricts the backward movement of the wedge 30, only the tension member 20 is removed to the ground.

10: fixing head, 20: tension member
30: wedge, 40: housing
50: spacer,
60: repulsion bar, 61: inclined portion
70: wedge restraint means, 71: locking jaw
72: restraint jaw,

Claims (12)

a fixing head (10) having a space inside that is open toward the rear;
a wedge 30 inserted into the space of the fixing head;
A tension member (20) whose tip is detachably connected to the wedge;
It is coupled to the rear of the fixing head and includes a housing 40 supporting the wedge,
a spacer (50) mounted inside the fixing head to space the wedge at a certain distance from the inner surface of the fixing head;
It is installed inside the fixing head to be height-adjustable toward the tension member, and when the tension member advances for removal, it restrains the advancement of the tip of the tension member without interfering with the advancement of the wedge, thereby causing the tension member to move toward the tension member by a repulsive force. A repulsion bar 60 that induces separation from the wedge;
A wedge restraining means formed on the wedge and the repulsion rod to restrain the wedge from moving in the direction of removal of the tension member when the wedge advances by the tension member,
The wedge restraining means includes a locking protrusion formed on the inner peripheral surface of the wedge, and a circumferential portion of the repulsion rod that protrudes toward the locking protrusion of the wedge. When the wedge moves forward, the locking protrusion is caught so that the wedge moves in the removal direction of the tension member. It includes a restraining jaw that restrains it from moving,
The spacer is in the form of a coil and is made of a material that does not have the force to return the wedge to its original position even if the external force disappears after the volume is reduced by the external force applied as the wedge advances, and the spacer maintains the reduced state so that the wedge does not move backwards. Tensile member removal type ground reinforcement using reaction force and wedge restraint. delete delete delete delete delete The method according to claim 1, wherein the repulsion rod includes an inclined portion that guides the wedge to spread. Tensile member removal type ground reinforcement using the repulsion force and restraint of the wedge. delete The method according to claim 1, wherein the tension member is any one of strands, steel bars, steel pipes, and reinforcing bars. Tensile member removable ground reinforcement using repulsion force and wedge restraint. The tensile member removable ground reinforcement material according to claim 1, wherein the ground reinforcement material is used for a cut retaining wall including a panel supported on the cut surface while the ground side end of the tension member passes through. The method of claim 1, wherein the ground side end of the tension member passes through the earth plate of the temporary facility and is used in the temporary facility. Tensile member removable ground reinforcement using the repulsive force and restraint of the wedge. A first step of drilling a hole in the ground;
A second step of inserting and installing a tension member removal type ground reinforcement using the repulsion force and restraint of the wedge according to claim 1 into the drill hole;
A third step of grouting the drilled hole;
A fourth step of fixing the tension member-removable ground reinforcement using the repulsion force and restraint of the wedge and tensioning the tension member;
A fifth step of removing the tension member,
In the fifth step, the tension member is advanced toward the anchoring portion to prevent the wedge from moving in the direction of removal of the tension member by the wedge restraining means, and the tip of the tension member is a tension member removal type ground using the repulsion force and restraint of the wedge. A method of installing and removing a tension member removal type ground reinforcement using the repulsion force and restraint of the wedge, characterized in that the tension member is separated from the wedge and moves backward toward the ground by colliding with the repulsion rod of the reinforcement.