JPS59141630A - Construction of anchor - Google Patents

Abstract

PURPOSE:To enhance the fixing effect of an anchor by a method in which a slider ring is slidably set on the inner surface of a freely opening outer ring, and an anchor head is provided to the inside of the slider ring and they are fixed to a hole-expanding portion together. CONSTITUTION:A pit of a constant and small diameter is excavated, the fixing portion of the pit is expanded by excavation to form a large-diameter section, and a casing 10 is penetrated into the small-diameter section. A diameter-expanding and fixing anchor is inserted into the casing 10 and lowered to the large-diameter section. The diameter-expanding and fixing anchor consists of an exapandible outer ring 1, a slider ring 2 to expand the outer ring 1, an anchor head 5 to slide the slider ring 2 to the outer ring 1, and a tension member 6 connected to the head 5. By a wedging force obtained when the tension member 6 is pulled up, the outer ring 1, the slider ring 2, and the anchor head 5 are integrally fixed to the inner wall of the large-diameter section.

Description

[Detailed description of the invention] The present invention relates to a method for constructing a diameter-expanding fixing anchor.

Conventionally, the construction method for earth anchors involves inserting a tensile material with an anchor into the ground to a predetermined depth, pulling up the tension material to remove the blades and plates at the tip, and then injecting a grout to connect the anchor. There are some that create resistance using bearing pressure from vanes or plates or friction at the injection agent area.

However, even if the ground has sufficient permissible bearing strength, there are limits to the bearing strength of the blades, etc. in the former case, and the permissible strength of the injection agent itself in the latter case, so conventional anchor construction methods However, it was not possible to obtain a large designed tensile force.

The purpose of the present invention is to improve the above-mentioned drawbacks, and its purpose is to expand the hole by wedge force on the anchor itself, without using the constant adhesive force of the anchor due to the adhesive force between the hole wall of the hole expansion part and the injection agent such as mortar. By enlarging the diameter of the anchor and fixing it in close contact with the local wall, we expect direct and reliable bearing strength between the anchor and the ground. The purpose of the present invention is to provide a construction method for an enlarged-diameter anchor anchor that can be set appropriately depending on the situation.

The invention will be explained in detail below.

First, a small diameter hole with a constant diameter is drilled in the ground, and then the diameter of the anchoring portion is expanded to form a hole enlarged portion. The casing 10 is pushed into the small diameter hole until it reaches the upper part of the enlarged hole part.

So Next, inside the casing 10, an enlarged diameter fixing anchor is installed. ＼Shining and lowering it to the enlarged part.

The diameter-expanding fixing anchor used in the present invention is an outer ring that is arranged to be expandable/a slider ring that expands the outer ring! , an anchor head 5 disposed inside the slider ring, which moves the slider ring to the outer ring by wedge feeding to spread the outer ring; and a tension member B connected to the anchor head; An example will be explained according to the drawings. The outer ring// is composed of three outer ring pieces bound together into a cylindrical shape by three springs//, and is expandable. At the top of the outer ring, an outer ring blade 7 is supported by a pin 2 so as to be freely closed, and a detent pin 3 is provided to prevent the blade 7 from rotating inward. . Further, an outer ring guide /l is provided at the top of the outer ring.

A / is fixed to the head ring pin on the head link g. The ore drop ring is detachably provided with the pin g/ fitted in the groove of the guide/Il, and temporarily holds the outer link/ until the outer ring/ is fully opened. I'm trying to keep it from falling apart.

A slide groove 3 is provided in the inner surface of the outer ring in the length direction, and slider stoppers are formed at both ends.

Slider ring pieces consist of three slider ring pieces. A slide key t corresponding to the slide groove 3 is fixed to the outer surface of the slider ring piece. The ends of the three slider ring pieces are tied together with rubber rings, strings, etc. to form a cylindrical slider ring that can be expanded freely.

A tension member B is passed through the conical anchor head j, and is fixed at the end with a fastener via a washer.

In the enlarged diameter fixing anchor lowered into the casing 10 of the small diameter hole in the state shown in FIG.
It is suspended while remaining in the groove of I, and lowered into the enlarged hole.

The fixing anchor enters the enlarged hole, and the blade 7 closes when it exits the end of the casing 10. Then, when the tension member B is pulled up, the blades 7 are locked to the end of the casing 10, and when the tension member B is further pulled up, the slider ring 2 is moved together with the anchor head 5 as shown in FIG. It rises one moment and reaches the position of the stopper 15.

When the tension member B is further pulled up in this state, the outer ring L is pushed open with the head ring pin and/or stuck in the groove of the guide ltl by the ascending anchor head S, and finally the pin and the groove of the guide ltl are pushed open. The engagement with is released.

The upper part of the anchor head 5 protrudes from the outer ring, and the outer ring expands freely to reach the hole wall of the expanded hole portion, and this expanded diameter fixing anchor is expanded in diameter and fixed in close contact. In this case, the slider ring 2 prevents the anchor head from coming out of the outer ring.

In this way, a wedge force R is generated by the anchor pulling force P, and the nouter ring/, slider ring 2, and anchor head 3 are pressed against the hole wall of the enlarged hole portion.

In addition, for permanent preservation, the mortar rots in this state.
Paddy is treated to prevent corrosion by injecting fillers such as

According to the present invention, an outer ring, a slider ring,
Since the anchor head and the anchor head are expanded and fixed tightly to the hole wall of the expanded hole, direct support from the bearing pressure strength (bearing resistance) of the ground can be expected, resulting in a great anchoring effect. The wedge force R increases in proportion to the anchor pulling force P, and the amount of compressive displacement on the ground side due to the wedge force R also increases. The thickness of the slider ring can be adjusted by changing the taper angle of the anchor head. can be adjusted to match the permissible compressive displacement of the ground.Also, when the expanded-diameter anchor is lowered into the expanded hole, if the tension material is pulled up and tensioned, pull-out failure will occur immediately, so mortar, etc. There is no need for a curing period for the injection agent, and the number of days required for anchor construction can be shortened.

[Brief explanation of the drawing]

FIGS. 1 and 2 are explanatory diagrams illustrating the effects of the enlarged diameter fixing invention used in the present invention. /: Outer ring - 2 slider ring 3 2 slide groove t 2 slide key 5: Anchor head O:
Tensile material 7: Outer ring vane and: Head link 9: Pushing head 10: Casing /3 Nyslider ring Stotsunomer procedure correction (method) Indication of Jl, +, H by the Director-General of the Approved License Agency Patent application filed in 1932 137th
No. 00 No. 2, Title of the invention Anchor construction method 3, Relationship with the case of the person making the amendment Patent applicant 4, Date of amendment order Hirotsuki 6, 1955 Date of dispatch 5, Showa 5G 5, Amendment Column 6 of the brief explanation of the drawings in the subject specification, details of the amendment*g, lines 9 to 70, “Figure 3...C
is a plan view. "A and H in FIG. 3 to AIB in FIG. 7 are constituent parts of the anchor used in the present invention, where A is a sectional view, B is a perspective view, and C is a plan view. Figure 3 shows the clasp, Figure J shows the tensile material, Figure S shows the anchor head, Figure 3 shows the slider ring placed inside the outer ring, and the outer ring blades can be freely closed on the top of the outer ring. 7 is an explanatory diagram of the state in which the head ring is inserted, with the pushing head fixed to the tension member and the head ring passed through it."

Claims (1)

[Claims] After drilling a small diameter hole with a certain diameter in the ground, the diameter of the anchoring part is expanded and an anchor is installed in the drilled hole.
A slide groove is provided in the length direction on either the outer ring or the slider ring, and a slide key is provided on the other, and the slider ring is arranged so as to be movable on the inner surface of the outer ring, which is arranged to be expandable. An anchor head is placed inside, and the tension member connected to the anchor head is pulled up, and the wedge force at that time expands the outer ring and unites the outer ring, the slider ring, and the king of the anchor head. A construction method for an expanding diameter fixing anchor, which is characterized in that it is fixed in close contact with the local wall of the expanded hole.