JPS5876613A - Anchoring device - Google Patents

Abstract

PURPOSE:To eliminate partial extension and break of a steel wire and to facilitate removal of the steel wire, by a mthod wherein load resistant plates, where an unbound PC steel wire can hook, are located in parallel to each other at an anchor body, and a steel wire hook packing is attached to a load resistant plate at a steel wire tension jack side. CONSTITUTION:Unbound PC steel wires 3, 3' hook load resistant plates 2, 2', respectively, positioned in parallel to each other at an end and a center of an anchor body 1, and said steel wires 3' hooks a load resistant plate 2', centrally positioned, through the medium of a packing 4. The anchor body 1 is formed such that the intermediate part between the load resistant plates 2 and 2' is formed in a hollow, and a plurality of reinforcing plates 5 and a number of projections 6 serving as a resistance during the presence in a ground of the device are provided between the two plates. Curved concave recesses 7, which the steel wires 3, 3' can hook, are formed in the load resistant plates 2, 2', and a hook part 8, which can mate the concave recess 7, is formed on the packing 4. This absorbs a stress, applied to the steel wire when a like stress is applied to the two steel wires 3, 3' by a jack, by bending of the packing 4, which results in bringing the two steel wires into an approximately constant extension.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a removable anchor device.

Various types of removable anchor devices that support retaining walls, mountain retaining walls, etc. are removed after completion of construction have been developed and proposed. One method is to hook unbonded tension steel onto the load-bearing plate of an anchor inserted into the bottom of a hole in the ground and arrange it in a U-shape. Use it by fixing it to the base, and when removing it, remove the fixation,
A method is known in which tension steel is removed by pulling one end of it.

There is no problem when using a sheath etc. to arrange tension steel materials in a U-shape with the above construction method, but multiple unbonded PC steel wires with grease interposed between the PO steel shear wire and the polyethylene pipe are used. When used in parallel, inconveniences may occur.

Since a plurality of unbonded PC steel wires are hooked onto each load-bearing plate installed in parallel according to the number of unbonded PC steel wires, the distance between the load-bearing plate and the unbonded PC steel wire tension jack is determined. This is due to the fact that there is a difference between In other words, if the permissible elongation rate of the unbonded C steel wire due to tension is constant, the elongation absorption range of the wire with a short span length is shorter than that of the wire with the same length, and the elongation is partially excessive. This caused a decrease in mechanical strength such as breakage or partial elongation.

The present invention was devised in view of the above-mentioned problems, and an object of the present invention is to provide an anchor device that can make the extension of a plurality of unbonded C steel wires having different lengths constant, and to solve the above-mentioned problems. It is something to do.

Hereinafter, the present invention will be described by way of examples based on the drawings.

In FIGS. 1 and 2, unbonded steel wires 3 and 31 are hooked to load-bearing plates 2 and 2'K, which are arranged parallel to the ends and the center of the fixing body 1, respectively, and At 21, the steel wire 3° is hooked through the unpondle C steel wire hooking flexible backing 4.

The fixing body 1 is made of cast steel or the like, and has a load-bearing plate 2 at the end.
The intermediate portion between the load-bearing plate 21 and the central load-bearing plate 21 is hollow, and has a plurality of reinforcing plates 5 and a large number of protrusions 1 6 that act as resistance in the ground.

Curved guide grooves 7 for catching the steel wires 3, 31 are formed in parallel in the load-bearing plates 2, 21.

Therefore, two steel wires 5 are attached to each load-bearing plate 2, 21.
, 5' f hook is obtained, total of four steel wires 3.31
can be hooked.

The backing 4 is made of an elastic member formed into a block shape with a curved surface, and a retaining piece 8 that can be fitted into the groove 7 of the load-bearing plate 21 is formed on two parts of the back surface.

This retaining piece 8 is fitted into the groove 7 and the backing 4
In this state, the steel wire 3'
The steel wire 31111: is hooked on the curved surface and gives an appropriate amount of deflection.

The amount of deflection is set to a maximum of 21:l+i, and should be appropriately set based on the length of the steel wire 6.31 and the interval between the load-bearing plates 2 and 21.

The anchor device as described above operates as follows.

When the design load on the fixing body 1 is 4 B ton or more, unbonded PC steel wires 6.3' are hooked onto both the load-bearing plates 2 and 21 arranged in parallel at the ends and the center, respectively. On this occasion,
A backing 4 is fitted onto the load-bearing plate 21.

The lengths of the steel wires 3, 31 are different due to the difference in distance between the unbonded PC steel wire tension jack and the load-bearing plates 2, 21.

Therefore, if the same tensile stress is applied by jacking,
The steel wire 31 with a shorter spanning length has a smaller elongation tolerance. At this time, the stress applied to the steel wire 31 is absorbed by the bending of the tensioning 4, and the steel wire 3.61
The length of is kept approximately constant.

The anchor device according to the invention comprises one or more configurations,
It is possible to eliminate partial elongation and breakage of the unbonded C-steel wire, and to facilitate and ensure removal of the unbonded C-steel wire.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an anchor device according to the present invention, and FIG.
The figure is its front view. 1...Fuser body, 2,21...Load-bearing plate, 5, 3'...Unbonded PC steel wire, 4...Backing, 5...Reinforcement plate,
6.Protrusion, 7.Concave groove, 8.Engagement piece. Patent applicant: Kensetsu Basic Engineering Co., Ltd. Structural Engineering Co., Ltd. Agent: Satoshi Hisakado

Claims (1)

[Claims] (1) A plurality of load-bearing plates each having a curved surface and forming a guide groove in which the unbonded PC steel wire is hooked are installed in parallel on the anchoring body, and among these, the unbonded PC steel wire tensioning jack An elastic member formed into a block shape with a curved surface and an unbonded PC steel wire hook is attached to the appropriate load-bearing plate on the side closer to the load-bearing plate. An anchor device characterized by having a king attached.