JPH11229372A - Looped tie rod construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the numbers of anchorages and anchoring operations and the cost of construction work when using a tie-rod construction method. SOLUTION: Walls are installed on both sides of natural ground to be reinforced, and a hole horizontal to the natural ground is bored to install a guide pipe 5. A waler 6 is installed on the outer surface of each wall 3, and both ends of a tie rod (4) passed through the guide pipe 5 are anchored thereto. In that case, the tie rod is made flexible, and a guide bent pipe 8 is installed on the outer surface of the waler 6 at a position corresponding to the guide pipe end of at least one of the walls. One tie rod is passed through the guide bent pipe 8, is bent 90 deg., and passed through two or more holes in succession, with both ends of the tie rod anchored in place by anchoages 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tie rod method used for reinforcing an embankment or the like.

[0002]

2. Description of the Related Art FIG. 2 is a view for explaining an example of a conventional tie rod method, wherein FIG. 2 (a) is a sectional view and FIG. 2 (b) is a plan view. The ground 1 is excavated on both sides to the ground 2 and indicates an area to be reinforced so as not to collapse by earth pressure. During excavation on both sides, walls 3 are installed on both sides of the ground 1 and holes for passing tie rods (tendons) 4 made of PC steel wire or the like are drilled by horizontal boring or the like. A guide tube 5 is installed in the hole thus drilled, and a belly 6 made of H-shaped steel or the like is installed on the outer surface side of the wall 3, and the tie rod 4 is inserted into the guide tube. Then, it is pulled by a center hole jack or the like, and both ends are fixed by a nut or wedge fixing method.

FIG. 3 is a view for explaining a nut fixing system. A nut 11 of a fixing tool is fitted to a screw portion at an end of a tie rod, and a steel pedestal 13 is pulled via a support plate 12 while being pulled by a jack. The wall is pressed using the contraction force of the tie rod when tightening and removing the jack.

FIG. 4 is a view for explaining a wedge fixing method, in which a wedge 21 of a fixing tool is fitted to an end of a tie rod, and a wedge is digged in by utilizing a contraction force of the tie rod, and a support plate 22 and a concrete-made The wall is pressed through the pedestal 23.

[0005] With such a fixing method, the wall 3 is pressed by the belly 6 by the contraction force of the tie rod, and the pressing force is opposed to the earth pressure, whereby the ground 1 is reinforced.

[0006]

According to the above-mentioned conventional tie rod construction method, it is necessary to perform fixing operation for each tie rod by using one tie rod and two fixing tools for one drilled hole. However, there is a problem that a large number of expensive fixing tools are required, a long fixing work time is required, and a construction cost is increased.

An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to provide a loop type tie rod method capable of reducing the number of fixing tools, the number of fixing operations, and the construction cost in the tie rod method. .

[0008]

According to the present invention, a wall is provided on both sides of a ground to be reinforced, a horizontal hole is drilled in the ground, a guide tube is provided, and a vent is provided on the outer surface of the wall. In the tie rod method of fixing both ends of the tie rod inserted into the guide tube by setting up the tie rod, the tie rod is made flexible, and the tie rod is guided to the outer surface of the bulge at the position corresponding to the end of the guide tube on one wall A bent tube is installed, and one tie rod is bent through 90 ° through a guide bent tube and continuously inserted into two holes, so that both ends of the tie rod are fixed by a fixing device. Further, the present invention provides a flexible tie rod, and a guide bent pipe is provided on an outer surface of a bulge at a position corresponding to a guide pipe end of a wall on both sides, and one tie rod is connected to the guide bent pipe. The tie rods are bent through 90 ° and continuously inserted through three or more holes, so that both ends of the tie rod are fixed by a fixing device. Also, the present invention provides that the guide bending pipe is 90 ° in the horizontal or vertical direction.
It is characterized by a bent structure.

[0009]

Embodiments of the present invention will be described below. FIG. 1 is a view for explaining a loop tie rod method according to the present invention. FIG. 1 (a) is a plan view, and FIG.
3A is a detailed view of a portion A, and the same numbers as those in FIG. 2 indicate the same contents. In addition, 8 is a guide bending pipe. FIG.
, The walls 3 are installed on both sides of the ground 1, holes for passing the tie rods 4 are drilled by horizontal boring or the like to install the guide tubes 5, and the H-shaped steel is formed on the outer surface side of the walls 3. Set up the stomach 6 and insert the tie rod 4 into the guide tube.
Is fixed by a nut or wedge fixing method in the same manner as in FIG.

In the present invention, as shown in FIG. 1 (a), one flexible tension member made of PC steel strand or the like is used for tie rods for two guide tubes on the same plane. It is inserted continuously and is fixed by two fixing tools 7,7. In this case, in order to guide the tie rod passing through one guide tube to the adjacent guide tube continuously, the tie rod should be parallel to the protruding end at the end portion (portion A in FIG. 1A). The tie rods should be bent at an angle of 90 °. Therefore, 90 ° with a predetermined curvature as shown in FIG.
A bent guide bending tube 8 is installed on the outer surface of the belly 6. The tie rod is bent by 90 ° through the guide bending pipe 8 so as to be parallel to the abdomen and guided to an adjacent guide pipe without damaging the tie rod, and both ends of the tie rod are fixed by fixing tools 7, 7. Thus, the tie rod passing through the two holes can be fixed by the two fixing tools.

In the above description, one tie rod is connected to two
Although the guide holes are passed through the two holes, the guide bent tube may be provided on the outer surface protruding from the opposite side, and the tie rod passing through the two holes may be successively passed through the adjacent holes. Further, in the above description, the tie rod is bent in parallel (in the same horizontal plane) to the bulge and inserted continuously into the adjacent guide tube. However, the tie rod is bent in the direction perpendicular to the bulge (vertically) and the tie rod is bent. The guide tube may be inserted continuously into the guide tube.

[0012]

As described above, according to the present invention, as compared with the conventional method of fixing a tie rod with two fixing tools for each hole, a number of holes are formed with two fixing tools. Since the passed flexible tie rod can be fixed, the number of fixing tools and the number of fixing operations can be reduced, and the construction cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a loop tie rod method of the present invention.

FIG. 2 is a view illustrating a conventional tie rod method.

FIG. 3 is a diagram illustrating a nut fixing method.

FIG. 4 is a diagram illustrating a wedge fixing method.

[Explanation of symbols]

1 ... ground pile, 2 ... ground, 3 ... wall, 4 ... tie rod, 5 ...
Guide tube, 6: belly, 7: fixing device, 8: guide bent tube.

Continuing on the front page (72) Inventor Hiroshi Nakamura 2-2-2, Yoyogi, Shibuya-ku, Tokyo East Japan Railway Company

Claims (3)

[Claims] 1. A wall is installed on both sides of a ground to be reinforced,
Drill a horizontal hole in the ground and install a guide tube, and install a bulge on the outer surface of the wall to fix both ends of the tie rod inserted into the guide tube, making the tie rod flexible. At the same time, a guide bent pipe is installed on the outer surface of the wall corresponding to the end of the guide pipe on one wall, and one tie rod is bent 90 ° through the guide bent pipe and continuously inserted into the two holes. And a tie-rod method in which both ends of the tie-rod are fixed by a fixing device. 2. Walls are installed on both sides of the ground to be reinforced,
Drill a horizontal hole in the ground and install a guide tube, and install a bulge on the outer surface of the wall to fix both ends of the tie rod inserted into the guide tube, making the tie rod flexible. At the same time, a guide bend tube is installed on the outer surface of the bulge at the position corresponding to the guide tube end of the wall on both sides, and one tie rod is bent 90 ° through the guide bend tube and continuously connected to three or more holes. A loop type tie rod method, wherein both ends of the tie rod are fixed by a fixing device. 3. The loop-type tie rod method according to claim 1, wherein the guide bending pipe has a structure bent 90 ° in a horizontal or vertical direction.