JPS59130917A - Earth anchor - Google Patents

Abstract

PURPOSE:To increase the fixing force of an anchor by a method in which an anchor head is slidably provided in a slider ring provided slidably in a freely expandable outer ring, and a tension member is connected to the anchor head. CONSTITUTION:A casing 10 is penetrated into a primary excavated pit drilled in the ground, and a pit expansion type fixing anchor is brought down into the casing 10. At the point where the anchor goes into an expanded pit portion and an outer ring blade 7 comes out of the end of the casing 10, the blade of the anchor is expanded. When a tension member 6 is pulled up, a slider ring 2 bound with the anchor head 5 by a rubber ring is raised in a sliding manner in the outer ring 1, a head ring pin 81 is moved along the outer ring guide 14 by the head 5, the outer ring 1 is expanded, and the pin 81 is removed from the guide 14. The upper part of the head 5 is projected from the outer ring 1, the outer ring 1 is expanded to the wall of the expanded pit portion, and thereby the anchor is fixed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to a hole expansion anchor, and more particularly to a sliding expansion anchor.

Conventionally, a tensile material with an integrated anchor was directly driven into or pushed into the ground anchor to a predetermined depth, and the tensile material was pulled up to attach it to the tip. There are anchors that open the blades or plates to form an integrated anchor, and resist by the bearing pressure of the ground and the blades or plates.However, with such anchors, when a predetermined pullout force is applied, there is a possibility of abnormal pullout. The drawback was that the earth anchor could be pulled out when a force was applied.

The present invention rectifies such drawbacks, and the purpose of the present invention is to improve the constant anchor force, not only by the incidental force (Pi'!fQ resistance) between the hole wall and mortar, etc. The anchor is spread out to the wall of the drilled hole, anchored and fixed, and we hope for the bearing pressure strength between this and the ground.The wedge force increases in proportion to the pulling force, and the angle of the taper of the anchor head increases. By changing the thickness of the slider, j1
It is an object of the present invention to provide a hole-expanding type fixing anchor that can appropriately set the allowable compression variation amount of the zero plate depending on the ground.

An embodiment of the present invention will be described with reference to the drawings. The outer ring is made up of three outer ring pieces bound together by three spring capes to be able to expand freely. The outer ring blade 7 is supported by a pin 7.2 at the top of the outer ring/ so as to be freely openable, and a detent pin/3 is provided to prevent the outer ring blade root from rotating inward. It is provided. Further, an outer ring guide/ll is provided at the top of the outer ring/. Head ring The head ring with the pin g/ fixed is installed in the outer ring guide/ll with the head ring fixed, and the head ring becomes a p1 bow with the outer ring/ fully open. up to outer ring L
is temporarily held to prevent the outer ring from falling apart.

There is a slider ring guide on the inner surface of the outer ring l.
A slit 3 is partially provided in the length direction, and a slider ring stopper/Yui chi is formed at both ends. Slider ring 2 consists of three slider ring pieces. A slide key corresponding to the slit 3 is fixed to the outer surface of the slider ring piece, and the ends of the slider ring piece are tied together with a rubber ring to form a slider ring that can be expanded freely. The slider ring 2 is configured to move along the inner surface of the outer ring along with the movement of the anchor head.

A tension member B is passed through the anchor head S of the conical table cloth, and is fixed at the bottom with a tension member clasp 3/ via a washer.

A tensioning material is passed from the bottom into the cylinder in which the outer ring/ and the slider ring 2 are movably connected, and a push-in head is fixed at a predetermined position of the tensioning material to form a hole-expanding fixing anchor. It is configured.

The method of operation and use of the hole-expanding fixation anchor of the present invention is as follows. First, a hole of a certain diameter is drilled in the ground to form a primary hole drilling section, and then the tip is expanded to form a hole enlarged section. Push each casing into the cut hole O section. Next, secure the expanded hole type fixing anchor at the bottom of the casing 10 at the station shown in Figure 1.

That is, the outer ring vane 7, which is provided at the top of the outer ring so that it can be opened freely, remains closed within the casing, and the head ring is in the groove of the outer ring guide. The fixing anchor is lowered in a hanging state.

The fixing anchor enters the enlarged hole and the outer ring blades 7 open when they exit the casing end, and when the tension member B is pulled up there, the outer ring blades 7 are locked to the casing end. If you pull up the tension member O further, the anchor head will appear as shown in Figure 2! At the same time, it was temporarily tightened with a rubber groan.
The slider ring 2 moves upward and reaches the position of the slider ring stopper 15. When the tension member B is further pulled, the head ring pin G/ is moved to the outer ring guide/4Z by the raised anchor head S.
The outer ring/ is pushed open by moving outward along the
Finally, the head ring bin g/ comes off from the outer ring guide/l.

The upper part of the anchor head protrudes from the outer ring, and the outer ring freely extends up to the hole wall of the borehole, and this anchoring anchor is anchored. This station building, Slider Lin Winter, is anchored. In this way, a wedge force R is generated by the anchor pulling force P, and the outer ring and slider Hayring are pressed against the hole wall of the enlarged hole portion.

Δ For permanent preservation, in this state, for example, mortar or the like is injected under pressure or scorching pressure to perform corrosion prevention I treatment.

According to the present invention, the fixed anchoring force can be expected to increase the bearing pressure strength (bearing resistance) of the ground, so a large anchoring effect is achieved and construction is reliable. The wedge force R increases in proportion to the pulling force P, and the wedge Due to the force R, the compression deformation of the cedar on the 11II board side also increases. The amount of compression displacement depends on the strata, but by changing the taper angle of the anchor head, the thickness of the slider ring can be adjusted to match the allowable amount of compression displacement of the ground. In addition, when the fixing anchor of the present invention is inserted into the expanded hole, the tensile material is pulled up and tensioned, and pull-out resistance is immediately obtained, so the period of good growth is shortened. It has excellent effects such as shortening the construction time and boiling in just 5 liters.

[Brief explanation of the drawing]

Figure m/ is an explanatory diagram before operation of the fixing anchor of the present invention, the second
The figure is an explanatory diagram of the recess 1 of the fixing anchor of unexploded 1111,
30 is a partial diagram of the fixing anchor of the present invention, and FIG. 11 is an explanatory diagram illustrating the function and effect of the fixing anchor of the present invention. /...Outer ring, 2...Slider ring, 3
...Slide slit, lIヱ...Slide key left...Anchor head, B...Tension material, 7...Outer ring Stopper procedure amendment 7-li (voluntary) Commissioner of the Japan Patent Office, Patent application for indication of case 1, Showa $ Yuzaichi Gua No. 73 2 Name of the invention Earth Anchor 3 Relationship to the amendment case Patent applicant address Shinkyo, Minato-ku, Tokyo! ;-30-7 Name Land Disaster Prevention Technology Co., Ltd. Contents of the mark 5 amendment (1) "Figure 3 is..." on page 9, line 9 of the specification
... Exploded view, Figure 3" [Figure 3 A11-IP, '
:',, An exploded view of i-force J, where A is a sectional view, B is a perspective view, and C is a plan view. Figure g is corrected. (2) Figure 3/, Figure 3! , 3 and 7 in Figure 3
Correct the figure as shown in the attached sheet.

Claims (1)

[Scope of Claims] / An outer ring arranged to be expandable, a slider ring that slides on the inner surface of the outer ring and expands the outer ring, either the outer ring or the slider ring. a slide key provided in one part in the longitudinal direction, and a slide slit provided in the longitudinal direction in the other, disposed inside the slider ring and extending over a wedge feeder to connect the slider link to the outer ring; an anchor head that expands the outer ring by moving it; a tension member connected to the anchor head; an outer ring blade provided on the top of the outer ring so as to be able to open freely; and an anchor head on the top of the detachable outer ring. A hole-expanding fixing anchor comprising a head ring that is freely wrinkled and allows the tension member and the upper anchor head to pass through it. ! - The hole expansion type fixing anchor according to claim 1, wherein the pushing head is fixed to the tension member.