JP2009197407A - Ground anchor recovery method and locking member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ground anchor recovery method which enables the simple performance of complete recovery of an anchoring body, and a locking member. <P>SOLUTION: An upper rotating shaft section 20 is equipped with the locking member 22, the leading end of which has a male-side latch claw 22a and an anti-coming-off claw 22b. The ground anchor recovery method comprises: a step of making the upper rotating shaft section 20 penetrate the ground along a tendon 30 of the ground anchor; a step of inserting the locking member 22 into the cavity portion 11a of the tubular anchoring body 10 while avoiding a female-side latch claw 13 which is protrusively provided on the inner wall surface 11b of the tubular anchoring body 10; a step of locking the male-side latch claw 22a to one side surface of the female-side latch claw 13 by rotating the upper rotating shaft section 20, and of locking the anti-coming-off claw 22b to a leading end surface of the female-side latch claw 13; and a step of recovering the tubular anchoring body 10 by pulling up the upper rotating shaft portion 20. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a ground anchor recovery method and a locking member.

In recent mountain excavation work, etc., in order to reduce construction costs related to land acquisition, etc., ground anchors are arranged only during excavation work, and removable anchors that can be removed after excavation work are used. There is a case.
Some of these removable anchors have incomplete removal of the fixing body.

  A ground anchor method capable of coping with such a problem is disclosed in Patent Document 1. In this ground anchor method, as shown in FIG. 5, after the tip shaft portion 110 having the tip wing is detachably attached to the lower end of the upper shaft portion 120 and is rotated and penetrated into the ground, the tip shaft portion 110 is fixed to a predetermined position. It is a ground anchor construction method that is used as a ground anchor fixing body by collecting the upper shaft portion 120 in a state where it is left at a depth, and the tip end 110 of the latch claw 122 biased in the locking direction by a spring 121. A latch mechanism is provided that connects the distal end shaft portion 110 and the upper shaft portion 120 by being engaged with the engagement opening 111, and can be remotely attached / detached by a wire W or the like. Yes.

  According to such a ground anchor method, when the tip shaft portion 110 used as the fixing body is collected, the upper shaft portion 120 is penetrated into the ground and then the latch mechanism is operated to operate the latch claw 122 of the upper shaft portion 120. And the locking opening 111 of the distal end shaft portion 110 are engaged with each other and the upper shaft portion 120 is pulled up, whereby the fixing body (the distal end shaft portion 110) can be completely removed.

JP 2002-363981 A [[0015], FIG. 2 (c) and FIG. 6)

  However, the ground anchor method has a problem that the structure of the latch mechanism is complicated, so that it takes time to manufacture the ground anchor and the cost is increased. Further, since it is necessary to operate the latch mechanism, there is a problem that it takes time and effort during the work. Further, when the latch mechanism made of the wire W or the like is damaged when the upper shaft portion 120 is penetrated, there is a problem that it is difficult to collect the fixing body (tip shaft portion 110).

  The present invention aims to solve the above-mentioned problems, and proposes a ground anchor recovery method capable of easily recovering a fixed body and a locking member used therefor. Is an issue.

  In order to solve the above-mentioned problems, a ground anchor recovery method according to the present invention recovers a tubular anchor of a ground anchor by means of an upper rotating shaft portion that penetrates the ground anchor along the tension material of the ground anchor. A method of recovering the upper rotary shaft portion provided with a locking member having a male latch claw and a slip-off preventing claw at the tip; and a projecting method on the inner wall surface of the tubular fixing body. Inserting the locking member into the inner space of the tubular fixing body while dodging the female latch pawl, and rotating the upper rotary shaft portion to connect the male latch pawl to one side of the female latch pawl And the step of locking the drop prevention claw to the tip surface of the female latch claw and the step of collecting the tubular fixing body by pulling up the upper rotary shaft portion. It is set to.

  According to such a ground anchor recovery method, it is possible to engage with the tubular fixing body only by rotating the upper rotating shaft portion without requiring a special mechanism. Therefore, it becomes possible to easily collect the tubular fixing body, which is excellent in workability and economically.

  The locking member of the present invention is formed at the tip of the upper rotating shaft and is locked by a plurality of female latch claws protruding from the inner wall surface of the tubular fixing body when the tubular fixing body is recovered. A male latch pawl that contacts the side surface of the female latch pawl and transmits the rotational force of the upper rotary shaft to the female latch pawl; and a tip of the male latch pawl. And a slip-off preventing claw that is engaged with the distal end surface of the female latch claw to transmit the pulling force of the upper rotating shaft to the female latch claw.

  According to such a locking member, it is possible to easily engage the upper rotary shaft portion and the tubular fixing body only by rotating the upper rotary shaft portion.

  According to the ground anchor recovery method and the locking member of the present invention, the complete recovery of the tubular fixing body can be performed easily and inexpensively.

  A preferred embodiment of the reinforcing method of the present invention will be described in detail with reference to the drawings. In the following description, the same reference numerals are used for the same elements, and duplicate descriptions are omitted.

  In this embodiment, as shown in FIG. 1, a tubular fixing body 10 that is a fixing body of the ground anchor 1 is arranged in the ground, used as the ground anchor 1, and then penetrates into the ground along the tendon 30. A method of recovering by the upper rotating shaft part 20 and the locking member 20 used therefor will be described.

  As shown in FIGS. 1 and 2A, the tubular fixing body 10 has a main body portion 11 formed of a hollow steel pipe, and a fixed base 12 for the tension material 30 in an inner space portion 11 a of the main body portion 11. Is formed. The tendon 30 is inserted through the inner space 11 a of the tubular fixing body 10, and the tip thereof is fixed to the fixed base 12.

  The main body 11 is formed of a steel pipe having a wall thickness that does not deform due to stress acting when penetrating into the ground or when used as a fixing body for a ground anchor. In addition, the shape dimension of the steel pipe which comprises the main-body part 11 is not limited, It is possible to set suitably.

  Further, as shown in FIG. 1, a plurality (four in this embodiment) of female latch claws 13, 13,... Project from the main body 11 at the rear part of the inner wall surface 11 b.

The female latch claw 13 is a member having a substantially trapezoidal cross section formed such that the side surface is orthogonal to the inner wall surface 11 b of the main body 11, and each is arranged at equal intervals.
The interval between the female latch claws 13 is not limited as long as it has a width that allows insertion of a later-described removal preventing claw 22b. Further, the shape and number of the female latch claws 13 are not limited and can be set as appropriate. Here, from the viewpoint of engagement with the locking member 22 and efficiency of transmission of force from the locking member 22, the side surface 13 a and the front end surface 13 b of the female latch claw 13 and the inner wall surface 11 b of the main body 11. The interior angle is preferably 90 ° or less.

On the outer peripheral surface of the tubular fixing body 10 (main body portion 11), wings (flanges) 14 are formed at two locations in the front and rear (left and right in FIG. 1).
In the present embodiment, the wing 14 is formed so that the outer diameter thereof is twice the inner diameter of the main body 11, but the shape of the wing 14 is not limited to this.

  Since the wing 14 protrudes from the outer peripheral surface of the main body 11 and digs into the natural ground, it functions as a fixing tool when the tubular fixing body 10 is used as a fixing body for the ground anchor. In the present embodiment, the wing 14 is formed as a fixing tool of the tubular fixing body 10, but the shape of the fixing tool is not limited to this, and a known shape such as a protrusion or a protrusion is appropriately used. Can be formed. In addition, the fixing tool such as the wing 14 may be omitted as long as the function as the fixing member of the ground anchor can be sufficiently exhibited only by the peripheral frictional force between the tubular fixing member 10 and the ground. Further, the number and arrangement of the blades 14 are not limited and can be set as appropriate.

  The upper rotating shaft portion 20 is used when the tubular fixing body 10 is installed or recovered in the ground, and is configured by continuously abutting a plurality of steel pipes 21 as shown in FIG. Thus, the locking member 22 is formed at the tip (end on the tubular fixing body 10 side).

  The inner diameter, length, and the like of the steel pipe 21 constituting the upper rotary shaft portion 20 may be appropriately set according to the shape and size of the tubular fixing body 10 and the workability when the upper rotary shaft portion 20 penetrates into the ground. It is not limited. Further, the thickness of the steel pipe 21 is not limited as long as it has a thickness capable of expressing a strength that does not deform due to stress or earth pressure when being pushed into the ground.

  The locking member 22 is a member that is locked to the female latch claws 13, 13,... Of the tubular fixing body 10, and contacts the side surface 13a of the female latch claw 13, as shown in FIGS. A plurality of (four in this embodiment) male latch claws 22a that contact and transmit the rotational force of the upper rotary shaft portion 20 to the female latch claws 13 and a female latch latch A locking prevention claw 22b that transmits the pulling force of the upper rotary shaft portion 20 to the female latch claw 13 by being locked to the tip surface 13b of the claw 13, and a reinforcing ring 22c that fixes the male latch claw 22a. It is prepared for.

  As shown in FIG. 2A, the male latch claw 22 a has a length equivalent to that of the female latch claw 13 protruding from the tip of the steel pipe 21, and the rear portion is fixed to the inner wall surface of the steel pipe 21. . Then, as shown in FIG. 2B, the front end surface of the steel pipe 21 and the rear end surface of the main body portion 11 are brought into contact with each other in a state where the locking member 22 is inserted into the inner space portion 11a of the tubular fixing body 10. The male latch claw 22a and the female latch claw 13 are superposed.

  As shown in FIG. 1, the disconnection prevention claw 22b has a larger width than the male latch claw 22a. The male side latch claw 22a and the drop prevention claw 22b are made of a single member having a T-shape. It should be noted that the removal preventing claw 22b according to the present embodiment is formed so that the width is narrowed toward the tip. Further, a bit 22d (see FIG. 4) is fixed to the distal end surface of the slip-off preventing claw 22b, and a ground hole (filler) can be drilled. Note that the shape and configuration of the removal preventing claw 22b are not limited and can be set as appropriate.

  As shown in FIG. 2C, the thicknesses of the male side latch claws 22a and the removal prevention claws 22b are formed larger than the thickness of the female side latch claws 13. In this way, the reinforcing ring 22c does not come into contact with the female latch claw 13 when the locking member 22 is inserted into the inner space 11a of the tubular fixing body 10.

As shown in FIG. 1, the reinforcing ring 22c prevents deformation of the male latch claw 22a. In this embodiment, the three reinforcing rings 22c, 22c, and 22c are arranged at predetermined intervals in the front-rear direction. Has been. The reinforcing ring 22c is fixed in a state where it abuts against the inner surface of the male latch claw 22a.
The number of reinforcing rings 22c, the interval between the reinforcing rings 22c, and the like are not limited and can be set as appropriate.

  As shown in FIGS. 1 and 2, the upper rotary shaft portion 20 is penetrated into the ground in a state where a tension member 30 extending from the tubular fixing body 10 is inserted into the inner space.

Next, the ground anchor construction method (ground anchor installation method and ground anchor recovery method) according to the present embodiment will be described.
First, the ground anchor installation method will be described. The ground anchor installation method includes a fixing member arranging step and an upper rotating shaft portion removing step.

  The fixing body arranging step is a step of arranging the tubular fixing body 10 at a predetermined depth as shown in FIG.

  In the fixing body arranging step, the tubular fixing body 10 penetrates into the ground by being pushed in while rotating the upper rotating shaft 20 in one direction while being connected to the tip of the upper rotating shaft portion 20. When the upper rotary shaft 20 is rotated in one direction, the side surface of the male latch claw 22a and the side surface 13a of the female latch claw abut, and the rotational force applied to the upper rotary shaft portion 20 is transmitted to the tubular fixing body 10. Is done. Further, the pushing force is transmitted through a butt surface between the front end surface of the steel pipe constituting the upper rotary shaft portion 20 and the rear end surface of the tubular fixing body 10. The upper rotating shaft part 20 is extended by abutting and connecting the steel pipe 21 at any time.

  The connection between the tubular fixing body 10 and the upper rotary shaft portion 20 is performed by locking a locking member formed at the tip of the upper rotary shaft portion 20 to the female latch claw 13 (see FIG. 4B). ).

  The steel pipes 21 constituting the upper rotating shaft part 20 are connected to each other by a known connecting means as appropriate so that the steel pipes 21 can be attached and detached and can transmit a rotational force and a pushing force (pull-out force).

  As shown in FIG. 3 (b), the upper rotating shaft portion removing step is performed by separating the tubular fixing body 10 and the upper rotating shaft portion 20 after the tubular fixing body 10 is disposed at a predetermined position. This is a step of removing only the upper rotary shaft 20 while leaving 10 in the ground.

  The tubular fixing body 10 and the upper rotating shaft 20 are separated from each other by rotating the upper rotating shaft 20 in the other direction (for example, counterclockwise rotation), so that the female latch claw 13, the male latch claw 22a, and the removal preventing member 22b are rotated. Are separated (see FIG. 4A), and then the upper rotary shaft portion 20 is pulled out.

  When the locking member 22 is extracted from the tubular fixing body, as shown in FIG. 3B, the filler 40 is injected through the steel pipe 21 while the upper rotary shaft portion 20 is extracted from the ground. Although the material which comprises the filler 40 is not limited, the material which can restore the intensity | strength of the natural ground disturbed by penetration of the upper rotating shaft part 20 to the intensity | strength equivalent to the circumference | surroundings is used. In this embodiment, air mortar is used.

  When the removal of the upper rotating shaft part 20 by the upper rotating shaft part removing step is completed, as shown in FIG. 3 (c), by installing the pressure receiving plate 31 on the ground surface and applying tension to the tension member 30, The tubular fixing body 10 is used as a ground anchor fixing body.

  Next, the ground anchor collection method will be described. The ground anchor recovery method includes an upper rotary shaft penetration process, a locking member insertion process, a locking process, and a recovery process.

  As shown in FIGS. 2 (a) and 3 (d), the upper rotating shaft portion penetration step includes an upper rotating shaft portion provided with a locking member 22 having a male latch claw 22a and a removal preventing claw 22b at the tip. 20 is a step of penetrating into the ground (re-drilling) along the tendon 30.

In the upper rotating shaft portion penetration step, the upper rotating shaft portion 20 is penetrated into the ground while adding the steel pipe 21 as needed. The upper rotating shaft penetration step is performed until the removal preventing claw 22b of the upper rotating shaft portion 20 reaches the rear portion of the tubular fixing portion 10.
When the upper rotary shaft portion 20 is rotated, the ground (filler) is drilled by the bit 22d of the locking member 22.

  As shown in FIG. 2 (b), the engaging member inserting step includes an engaging member 22 of the upper rotary shaft portion 20 that has penetrated into the ground along the tension member 30 (has reached the rear portion of the tubular fixing portion 10). Is inserted into the inner space 11a of the tubular fixing body 10 while dodging the female latch claws 13, 13,... Protruding from the inner wall surface 11b of the tubular fixing body 10.

  When the drop prevention claw 22b is in contact with the female latch claw 13, the upper rotary shaft portion 20 is rotated little by little so that the male latch claw 22a (drop prevention claw 22b) is connected to the female latch claw 13 with each other. Find the position to insert between. Then, in a state where the male latch claw 22a (disengagement prevention claw 22b) is arranged between the female latch claws 13, the locking member 22 is inserted into the inner space 11a by pushing the upper rotary shaft portion 20. To do.

  As shown in FIGS. 2 (c) and 4, the locking step is performed by rotating the upper rotary shaft portion 10 in a state where the locking member 22 is inserted into the inner space portion 11 a of the tubular fixing body 10. In this step, the male latch claw 22a is engaged with the one side surface 13a of the female latch claw 13 and the removal prevention claw 22b is engaged with the distal end surface 13b of the female latch claw 13.

When the locking member 22 is inserted into the inner space portion 11a of the tubular fixing body 10, as shown in FIG. 4A, the removal preventing claw 22b is connected to the tip of the female latch claw 13 (on the side opposite to the upper rotary shaft portion 20). (End portion) is disposed at a position protruding from the surface 13b.
When the locking member 22 (upper rotating shaft portion 20) is rotated in this state, the side surface of the male latch claw 22a and the side surface 13a of the female latch claw 13 come into contact with each other as shown in FIG. At the same time, when the locking surface of the slip-off preventing claw 22b comes into contact with the distal end surface 13b of the female latch claw 13, the rotational force and the pulling force can be transmitted from the locking member 22.

  As shown in FIGS. 2 (c) and 3 (e), the recovery process is performed by fixing the tubular member by pulling up the upper rotary shaft 20 in a state where the locking member 22 is locked to the female latch claw 13. This is a step of collecting the body 10. At this time, by pulling up the upper rotary shaft 20 while rotating it, the rotational force is transmitted from the male latch claw 22a to the female latch claw 13 while the lifting force is removed from the prevention claw 22b to the female latch claw 13. The tubular fixing body 10 is pulled out by transmitting.

As described above, according to the recovery method and the locking member according to the present embodiment, it is possible to connect the upper rotary shaft portion and the tubular fixing body only by the rotation of the upper rotary shaft portion, so that the operation is easy. .
In addition, since a special operation mechanism is not required for the engagement of the locking member with the tubular fixing body, the manufacturing is easy and the operation mechanism is not damaged and cannot be recovered.

  Moreover, since the structure of the locking member is simple, even if the locking member is damaged, the recovery can be performed at an early stage.

Since a steel pipe (tubular fixing body) is used as the fixing body, it can function as a fixing body with pull-out resistance only by being placed at a predetermined position, so that the time required to create a ground anchor can be shortened. It becomes.
In addition, by removing the tubular fixing body, there is no structure remaining in the ground, so there is no need to purchase land for the construction of the ground anchor, and the overall construction cost can be greatly reduced. It becomes.

As mentioned above, although preferred embodiment was described about this invention, this invention is not limited to the said embodiment, A design change is possible suitably in the range which does not deviate from the meaning of this invention.
For example, in the above-described embodiment, the fixing member is used to place and recover the tubular fixing body in the ground, but it may be used only for recovery.

  Further, in order to prevent blurring from occurring when the upper rotary shaft portion penetrates, wings or the like may be formed on the outer peripheral surface of the upper rotary shaft portion (steel pipe).

The purpose of use of the ground anchor using the tubular fixing body according to the present invention is not limited.
The formation angle of the ground anchor is not limited.

1 is a perspective view showing a ground anchor according to a preferred embodiment of the present invention. (A)-(c) is sectional drawing which shows the collection method of a tubular fixing body. (A)-(e) is sectional drawing which shows each construction process of the ground anchor shown in FIG. (A) And (b) is the schematic which shows the engagement method of a locking member. (A) And (b) is a figure which shows the joining condition of the tubular fixing body of the conventional ground anchor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ground anchor 10 Tubular fixing body 11 Main body part 11a Inner space part 11b Inner wall surface 13 Female side latch claw 20 Upper rotating shaft part 22 Locking part 22a Male side latch claw 22b Removal prevention claw 30 Tension material

Claims (2)

A ground anchor recovery method for recovering a tubular anchor of a ground anchor by means of an upper rotating shaft portion that is penetrated into the ground along the tension material of the ground anchor,
A step of penetrating the upper rotary shaft portion provided with a locking member having a male latch claw and a slip-off preventing claw at the tip;
Inserting the locking member into the inner space of the tubular fixing body while dodging the female latch claw protruding from the inner wall surface of the tubular fixing body;
Rotating the upper rotating shaft to lock the male latch claw to one side of the female latch claw and locking the removal prevention claw to the distal end surface of the female latch claw;
Recovering the tubular fixing body by pulling up the upper rotating shaft part;
The ground anchor collection method characterized by including. A locking member that is formed at the tip of the upper rotating shaft and that is locked to a plurality of female latch claws projecting on the inner wall surface of the tubular fixing body when the tubular fixing body is recovered;
A male latch claw that contacts the side surface of the female latch claw and transmits the rotational force of the upper rotary shaft to the female latch claw;
A pull-out preventing claw that is formed at the tip of the male latch claw and is engaged with the tip surface of the female latch claw to transmit the pulling force of the upper rotating shaft to the female latch claw; A locking member comprising:

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