JP2845725B2 - Anchor method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anchoring method for supporting a concrete retaining wall on a ground.

[0002]

2. Description of the Related Art After the other end of a PC stranded wire or tie rod having one end connected to an anchor anchoring portion is penetrated through a concrete retaining wall and the end protruding from the retaining wall is gripped, the PC stranded wire or tie rod is tensioned. An anchoring method for fixing the end to a retaining wall with bolts and nuts is well known.

In the conventional anchoring method, when the concrete retaining wall side is a valley side, a temporary scaffold is required on the valley side for tensioning and fixing of a PC stranded wire or a tie rod, which is dangerous.

[0004] Therefore, it is difficult to re-tension and fix the concrete retaining wall when it is inflated after completion. Also, the length of the PC strand or the like cannot be easily changed on site.

For example, Japanese Utility Model Laid-Open Publication No. 54-49103 discloses a technique for connecting a steel sheet pile to a retaining wall via a tie rod arm ring joint at the time of revetment work. However, in the known technique, the tie rod is prevented from being loosened by the bolts on both sides, and since the steel sheet pile is prevented from falling down due to the earth pressure, there is no need for the tie rod to be tensioned.

[0006]

SUMMARY OF THE INVENTION Accordingly, the present invention relates to an anchoring method capable of easily performing deformation repair of a completed concrete retaining wall when the concrete retaining wall is supported on the ground with a poor scaffold. It is intended to provide.

[0007]

According to a first method of the present invention, in a method of anchoring a concrete retaining wall to a ground, a PC stranded wire having one end connected to an anchor anchoring portion and the concrete retaining wall, respectively. The other end of each bolt is connected to one end of a bolt, the other end of the bolt is screwed into a tie joint, and a pair of stopper arms for locking the bolts in the rotation direction and a wrench part rotating with the tie joint. Prepare a driving device consisting of a motor that rotates the wrench and the wrench, lock the bolts in the rotation direction with the stopper arm of the driving device, operate the motor and rotate the tie joint with the wrench to activate the tie joint. Both PCs are tensing the lines.

According to the second construction method of the present invention, in the anchor construction method for supporting the concrete retaining wall on the ground, one end of each of the PC strands and the like connected at one end to the anchor fixing portion and the concrete retaining wall, respectively. A drive device comprising a wrench portion driven by a motor, a stopper arm for locking the lock nut screwed onto the bolt, and an electric jack for moving the lock nut closer to each other. The tie joint is rotated by rotating the wrench with a motor while tensioning the wires of both PCs via the lock nut with the electric jack, and the tie joint is rotated, and the bolt is screwed into the tie joint.

According to the third construction method of the present invention, in the anchor construction method for supporting the concrete retaining wall on the ground, one end of each of the other ends such as a PC strand connected to the anchor fixing portion and the concrete retaining wall, respectively. Then, the stopper fittings are connected to each other via wedges, and these stopper fittings are pulled in a direction away from each other to tension the wires from the PCs, and then the overlap portion is swaged and swaged with a tie joint. It has become.

[0010]

Therefore, according to the first and second methods, by rotating the tie joint using a motor,
Tighten the wires of both PCs via bolts in the middle between the anchor anchoring part and the concrete retaining wall. Since the tension work is performed by the motor in this manner, there is no need to provide a temporary scaffolding, and thus safety is achieved.

According to the third method, both PC strands are pulled away from each other, that is, the right side is pulled to the left and the left side is pulled to the right, so that tension is applied between the anchor anchoring portion and the concrete retaining wall. Then, caulking is performed to fix the wires from both PCs. With this method, a temporary scaffold or the like is not required, and the work is safe.

In the first and second methods, even if the concrete retaining wall is deformed after completion, the tie joint is rotated, and the PC is rotated.
Strands and the like can be re-tensioned and easily corrected.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, a concrete retaining wall A is supported on a ground C by a tie rod 1 connected to an anchor fixing portion D of the ground C.

The outer end 2 of the tie rod 1 is fixed to a retaining wall A by a plate 3 and a nut 4 and is covered by a cap 5. The tie rod 1 in the embankment B is divided into an outer tie rod 1a and an inner tie rod 1b, and both parts 1a and 1b are screwed to a turnbuckle type tie joint 6 and tightened by the rotation of the tie joint 6. I have.

FIG. 2 shows an example of a driving device for fixing the tie joint 6 and connecting the two PC strands.
In this example, the outer PC strand 7a and the inner PC strand 7
b is used, and the outer end of the outer PC strand 7a is
A connection bolt 9 is fixed to the bolt 8 and connected to the inner end. The inner end of the inner PC strand 7b is fixed to the anchor fixing part D, and the outer end is connected to a connecting bolt 9b.
Are connected.

A drive device, generally designated by the reference numeral 10, includes a pair of stopper arms 11 for locking the bolt 9 in the rotational direction.
And a wrench 12 for rotating the tie joint 6 and a motor 13 for rotating the wrench 12. The motor 13 is selectively connected to a power source (not shown) outside the concrete retaining wall A by an electric wire 14. It has become so.

The outer PC strand 7a is fixed to the concrete retaining wall A by the plate 3 and the nut 4 via the bolt 8. Further, the wire 7b from the inner PC is fixed to the anchor fixing portion D, and both bolts 9 of the wires 7a and 7b from both PCs are screwed into the tie joint 6.

Next, the stopper arm 1 of the driving device 10
The bolts 9 and 9 are locked in the rotation direction by 1 and 11, the motor 13 is operated, the tie joint 6 is rotated by the wrench 12, and the wires 7a and 7b are tensioned from both PCs.

Then, as shown in FIG.
9 is a sufficient length L for the tie joint 6 (for example, 200 m
When the stranded wires 7a and 7b are tightened to the extent that they are screwed by m), the driving device 10 is removed and the process is finished.

Accordingly, since the strands 7a and 7b of the PC are tensioned inside the concrete retaining wall A, a conventional temporary scaffold is unnecessary, and the work can be performed safely.

When the concrete retaining wall A swells after completion, electric power is supplied from the electric wire 14 to the motor 13.
Is operated, the tie joint 6 is rotated by the wrench portion 12, and the swelling can be easily corrected by re-tensioning the wires 7a and 7b from both PCs.

FIG. 4 shows an embodiment for carrying out the second method of the present invention, in which a wrench portion 16 driven by a motor 15, an electric jack 17, and a lock nut 18 screwed to a bolt 9 are connected to a driving device 10 A. This is an example in which a stopper arm 19 for stopping is provided. In this embodiment, the electric jack 17 is contracted, and the two PC stranded wires 7a,
The wrench 16 is rotated by the motor 15 while the tension is applied to the joint 7b.
9 to a sufficient length L1 (for example, 100
mm) into the joint 6 and then the driving device 1
Remove 0A and finish.

FIG. 6 shows another embodiment of the driving device. This driving device 10B is constituted by removing the motor 15 and the wrench portion 16 from the driving device 10A shown in FIG.
Rotate the tie joint 6 with 6A and use both PC strands 7a,
This is an example in which 7b is strained.

FIG. 6 shows an apparatus 10C for implementing the third method of the present invention.

According to the third invention, stopper plates 21 are fixed to the inner end of the outer PC strand 7a and the outer end of the inner PC strand 7b by wedges 20, respectively.
The stranded wires 7a and 7b are pulled and stretched in a direction away from each other, and the overlapped portion is connected to the center cross joint 2
It is a method of fixing by caulking.

The driving device 20c is provided with a caulking portion 24 driven by a driving portion 23, an electric jack 17, and a stopper arm 19 for locking the stopper plate 21.

During tension, the center cross joint 22
, The stopper arms 19, 19 abut against the opposing surfaces of the stopper plates 21, 21, and the electric jack 17 is extended to separate the stopper plates 21, 21 from each other. To pull. And
When a predetermined degree of tension is obtained, the center cross joint 22 is crushed by the caulking section 24 by operating the drive section 23, and both P
After fixing the stranded wires 7a and 7b, as shown in FIG. 7, the excess portions of both stranded wires 7a and 7b are cut, and the driving device 10C is removed to finish.

FIGS. 8 and 9 to 13 show center cross joints 22A, 22B for caulking two, three, four, and five PC strands 7a and 7b, respectively.
22C, 22D and 22E are shown.

FIG. 14 and FIG.
A center cross joint 22F that obliquely tensions the strands 7a and 7b of the book PC is shown.

[0031]

As described above, according to the present invention, the following effects can be obtained.

Since temporary tension is not required on the valley side due to intermediate tension, there is little danger in terms of safety.

If the concrete retaining wall swells due to a landslide or the like after completion, it can be easily re-tensioned and corrected.

Because of on-site processing, it does not take much time to change the length of a wire or the like from a PC.

The PC strand and the tie rod can be used alone or in combination.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view illustrating an embodiment of a first method of the present invention.

FIG. 2 is a side view showing one embodiment of a driving device.

FIG. 3 is a side view showing a state after tension of a PC stranded wire of FIG. 2;

FIG. 4 is a side view showing an example of the second method of the present invention.

FIG. 5 is a side view showing a state after tension of the PC stranded wire of FIG. 4;

FIG. 6 is a side view showing an example of a driving device that implements a third method of the present invention.

FIG. 7 is a side view showing a state after tension of the PC stranded wire of FIG. 6;

FIG. 8 is a front view showing one embodiment of a center cross joint.

FIG. 9 is a side view of FIG. 8;

FIG. 10 is a front view showing another embodiment of the center cross joint.

FIG. 11 is a front view showing another embodiment of the center cross joint.

FIG. 12 is a front view showing another embodiment of the center cross joint.

FIG. 13 is a front view showing another embodiment of the center cross joint.

FIG. 14 is a front view showing another embodiment of the center cross joint.

FIG. 15 is a side view of FIG. 14;

[Explanation of symbols]

 A: concrete retaining wall B: buried C: ground D: anchor fixing part 1: tie rod 1a: outer tie rod 1b: inner tie rod 2: outer end 3 ... Plate 4 ... Nut 5 ... Cap 6 ... Tie joint 7 ... PC stranded wire 7a ... Outer tie rod 7b ... Inner tie rod 8 ... Tie up 9 ... Connection bolts 10, 10A, 10C ... Driving device 11, 19 ... Stopper arm 12, 16 ... Wrench part 13, 15 ... Motor 14 ... Electric wire 17 ... Electric jack 18 ... Lock nut 20 ・ ・ ・ Wedge 21 ・ ・ ・ Stopper plate 22, 22A to 22F ・ ・ ・ Center cross joint 23 ・ ・ ・ Drive unit 24 ・ ・ ・ Caulking unit

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Yoshitaka Uesugi 8-14-14 Ginza, Chuo-ku, Tokyo Nittoku Construction Co., Ltd. (56) References Japanese Utility Model 1979-49103 (JP, U) (58) Field surveyed (Int.Cl. ⁶ , DB name) E02D 5/80

Claims (3)

(57) [Claims] In an anchoring method for supporting a concrete retaining wall on a ground, one end of a bolt is connected to each of the other ends of a PC stranded wire or the like connected to the anchor fixing portion and the concrete retaining wall, respectively, Prepare a drive device consisting of a pair of stopper arms that screw the other ends of the bolts into a tie joint, lock the bolts in the rotation direction, a tie joint, a wrench that rotates, and a motor that rotates the wrench. An anchoring method characterized in that the bolts are locked in the rotation direction by a stopper arm of the driving device, a motor is operated, and a tie joint is rotated by a wrench portion to tension the wires and the like from the two PCs. . 2. An anchoring method for supporting a concrete retaining wall on a ground, wherein one end of each of a PC stranded wire or the like connected to the anchor anchoring portion and the concrete retaining wall is screwed to a lock nut. Prepare a drive device comprising a wrench mounted by a motor, a stopper arm for locking a lock nut screwed onto the bolt, and an electric jack for moving the lock nut toward each other, and lock with the electric jack. An anchoring method characterized by rotating a wrench part by a motor while tensioning a wire from both PCs via a nut to rotate a tie joint and screwing a bolt into the tie joint. 3. An anchoring method for supporting a concrete retaining wall on a ground, wherein one end is connected to an anchor fixing portion and the other end of a PC stranded wire or the like connected to the concrete retaining wall, and a stopper fitting is provided via a wedge. An anchoring method comprising: connecting the two stopper metal fittings in a direction away from each other to tension the wires of the two PCs; then, caulking the overlap portion and caulking with a tie joint.