JPS6121226A - Earth anchor - Google Patents

Abstract

PURPOSE:To firmly secure an anchor, by a method wherein an annular drum part is mounted in the vicinity of the forward end of an anchor, an unfoldable ring member is connected to the drum part, and an anchor head, sliding in the direction of length along the inner wall of the ring member. CONSTITUTION:After a casing B and an earth anchor A are inserted into an excavated hole provided in a ground, the forward end of a drum part 11 is hooked to a terminal end part B of the casing B as a tensile material 4 is lifted up, and the tensile material 4 is further lifted up to slide an anchor head 3 along the inner wall of a slider ring 2. In which case, the slider ring 2 is slid along the inner wall of an outer ring 1 together-with the anchor head 3, the slider ring 2 and the outer ring 1 are unfolded. This causes the outer ring 1 to be pressed against a hole wall, and firm securing of the earth anchor A.

Description

[Detailed description of the invention] Ru The present invention relates to an earth anchor whose diameter can be freely expanded.

Conventionally, earth anchors are constructed by driving or pushing a tensile member with an integrated anchor directly into the ground to a predetermined depth, and then pulling up the tension member to open the blade or plate at the tip to anchor the anchor. There are those that form a single piece and resist by bearing pressure from the ground and blades or plates. Although such anchors are effective when a predetermined pullout force is applied, the maximum pullout resistance varies depending on the soil quality, and the anchor has the drawback that when an abnormal pullout force is applied, the entire anchor is pulled out.

(Objective of the invention) The present invention improves the above-mentioned drawbacks, and improves the fixed anchoring force by adjusting the adhesion force (frictional resistance) between the hole wall and the mortar etc.
Instead of relying only on the anchor, the diameter of the fixed anchor is expanded to the expanded hole wall, and it is anchored and fixed, and the bearing pressure strength between this and the ground can be expected, and the wedge force increases in proportion to the pulling force. It is an object of the present invention to provide a diameter-expandable earth anchor that can appropriately set the permissible compression displacement amount of the ground depending on the ground by increasing the taper angle of the anchor head and the thickness of the ring member.

(Structure of the Invention) The earth anchor of the present invention includes a ring member whose diameter can be freely expanded and includes a body portion and legs connected to the body portion or integrally formed therein, and a length along the inner wall of the ring member. It consists of an anchor head that slides in the direction to expand the diameter of the ring member, and a tension member fixed to the anchor head.

Another earth anchor of the present invention includes a first ring member whose diameter can be freely expanded, a second ring member in which seven or more than two ring members are arranged inside the first ring member, and the second ring member. an anchor that swivels longitudinally along the inner wall of the first ring member, causes the second ring member to swivel longitudinally along the inner wall of the first ring member, and expands the diameters of the first and second ring members; It consists of a head and a tensile member fixed to the anchor head.

The ring member consists of a body and legs, and when the legs are made thick, the legs and body may be fixed together using a slightly thinner connecting member.

An embodiment of the present invention will be described with reference to the drawings.

In FIGS. 1 and 2, the first ring member, the outer ring/, has a leg portion 12 formed integrally with the body portion/l. For example, one end of the cylinder is used as the body of the outer ring, and a cut /3 is provided in the length direction of the cylinder to form the leg /2. A notch /+ is provided near the boundary between the body part // and the leg part /2. In FIG. 3 and FIG. 1, the body part// of the outer ring// and the leg part/2 are shown in a state where they are fixed to each other.

The slider ring 2, which is the second ring member, has a leg portion 2.
2 is integrally formed with the body portion 2/.

One end of the cylindrical body is used as the body part 21 of the slider ring 2, and a notch 23 is provided in the length direction of the cylindrical body to form a leg part 23.

A taper /2/ is formed at the end of the outer ring /, and a taper 2// is formed at the tip of the body of the slider ring 2.
It is designed so that it can be easily inserted into the outer ring (see Fig. 3). A guide 2 is provided on the outer peripheral surface of the slider ring 2 in the length direction, and a taper 22/ is formed at the distal end of the slider ring 2.

A tensile member 1 is fixed to the anchor head 3. A guide 32 is provided in the length direction on the outer peripheral surface of the anchor head 3, and a taper 3/ is provided at the tip thereof.

The diameter-expandable earth anchor A of the present invention is arranged such that the slider ring 2 is connected in a straight line so that the slider ring 2 can be inserted into the slider ring.

The inner wall of the outer ring / is configured to engage with a guide 21 provided on the outer circumferential surface of the slider ring, and the inner wall of the slider ring 2 is configured to engage with a guide 3Il provided on the outer circumferential surface of the anchor head 3. The ring/slider ring 2 and the anchor head can be aligned.

(Effects of the Invention) The operation and usage of the earth anchor A of the present invention are as follows. First, a hole of a certain diameter is drilled in the ground to form a primary hole, and then the tip is expanded to form a hole enlarged portion. Push the casing into this cut hole. Next, place the earth anchor A inside the casing in the state shown in Figures 2 and 1, that is, fix the tensile material to the reed car head 3, pass the slider ring 2, then the outer ring in that order, and lower it with the cedar connected. and insert it into the expanded hole. Hook the body tip of the outer ring of earth anchor A to the end of the casing without pulling up the tension member T, and then pull up the tension member T to raise the anchor head 3 while sliding it along the inner wall of the slider ring 2. Then, the slider ring 2 moves upward along with the anchor head 3 along the inner wall of the outer ring, and the slider ring 2 and the outer ring expand in diameter (Figs. 1 and 3).
. The anchor pulling force creates a wedge force that forces the outer ring against the bore wall of the ream. Finally, the casing is extubated and mortar is injected into it for permanent preservation.

According to the present invention, the fixed anchor force is extremely large because the bearing strength of the ground can be expected, and the construction is easy and reliable.
The wedge force increases in proportion to the pulling force, and the compression incident on the ground side due to the wedge force also increases.By changing the thickness of the outer ring 1 and the thickness of the slider individual ring 2, or by changing the thickness of the slider ring 2, the wedge force increases in proportion to the pulling force. By using the ring 2, it is possible to easily adapt to the permissible compressive displacement of the ground.If the tensile material is tensioned, the pull-out resistance can be immediately changed, so there is no need for a curing period, and the number of days required for anchor construction can be shortened. It has a simple structure, has a large allowable tensile load, and has excellent effects such as no damage.

[Brief explanation of drawings]

FIGS. 1 and 2 show an embodiment of the earth anchor of the present invention, and show the earth anchor in a state in which the diameter is expanded and in a state before the diameter is expanded, respectively. FIGS. 3 and 3 show other embodiments of the present invention, showing the ground anchor in a state where the diameter is expanded and a state before the diameter is expanded, respectively. A: Earth anchor /: Outer ring //: Body /2 = Leg 2 = Slider ring 2 /: Body 22
: Leg 3: Anchor head t: Tensile material r; Reed I
-°゛Sil-National Land Disaster Prevention Technology Co., Ltd. Company Notes Opening A61-21ZZtiLO7 Procedural Amendment (Voluntary) September 2b, 1920 Director General of the Patent Office 1 Indication of Case 1988 Patent Application No. 1 Gua 73 O 2 Name of the invention Earth Anchor 3 Relationship with the case of the person making the amendment Address of the patent applicant Shin H@!, Minato-ku, Tokyo! ;-30-7 (Kaga Building) Detailed explanation of the invention in the specification column 5 Contents of the amendment After "It is in this." on the last line of the second page of the specification,
``The ground to which the earth anchor of the present invention is anchored is not particularly limited, but includes, for example, a sand layer, a gravel layer, a bedrock layer, etc.''. Procedure Amendment S (Voluntary) February 1985 JOB 1982 ff”lj Fl Order No. 14173 June 2 Name of the invention Earth 7 Anker 3 Relationship with the person making the amendment f1 Patent applicant location Port of Tokyo Ward Shinm 5-30-7 (Kaga Building) For the specification, there is a column for the scope of the patent application, a column for the detailed explanation of the invention, a column for the brief explanation of the drawings, and the drawings.Amended specification 1, invention Name of the earth anchor 2, claim 1, a body part 11 and fixed to the body part 11, and also G, L
- A ring part (41) that can freely expand its diameter and is made up of legs 12 formed on the body, and an anchor head 3 that moves in the length lj direction along the inner wall of the ring member 1 and expands the diameter of the ring member 1.
, and a tensile member 4 fixed to the anchor head 3, the earth anchor is capable of expanding its diameter and is anchored to a hard ground surface. 2. The trunk 11 and fixed to the trunk 11, or -
A first ring member 1 having a diameter that can be expanded freely and consisting of a leg portion 12 formed on the body; one or two ring members inside the first ring member 1;
IQ is better than Llli[! H-shaped body 21 and body 21
A part 22J fixed to or integrally formed with the second ring member 2; a second ring member 2 that moves longitudinally along the inner wall of the second ring member 2; 2
an anchor head 3 that expands the diameter of the first and second ring members 1.2 as the first ring member 1 is stretched longitudinally along the inner wall of the first ring member 1;
Regarding an earth anchor whose diameter can be freely expanded. Conventionally, earth anchoring was done by driving or pushing a tensile material with an integrated anchor into soft ground, such as soft ground, to a predetermined depth, and then pulling up the tensile material. There are some types of anchors that are formed by opening the wings or plates at the tip to form an integral anchor, and resisting with bearing pressure from the wings or plates. Specifically, (1) the connection between the tension member and the anchor unit is
i41 Things that are done in bins etc. so that they can be turned (2)
There are those with a structure in which the pressure-bearing surface opens like an umbrella when the tensile material is pulled, and (3) there are those in which the anchor is made up of a screw. This J: eel anchor is effective when a predetermined pulling force is applied to it, but the pull-out resistance of the J- anchor is significantly different from that of the soft ground, and when a normal pull-out force is applied to the In this case, the Anno J unit was pulled out as it was, and in the case of slightly hard sandy ground, the anchor unit was bent, the connecting part between the tensile material and the I1 anchor rest was damaged, and there was a large vacancy in which the anchor strength was small. Purpose of the Invention The present invention aims to improve this J, vacancy, and to improve hard L
The target ground is l11 or rock, and the tension of the anchor is fixed between the anchor and the hole wall of the hole drilled in the hard ground or relatively strong weathered rock, soft rock, rock, etc. It is an object of the present invention to provide a novel 7-scan anchor with an enlarged diameter of 7F, which is supported by the bearing force of the outer surface of the anchor fixed body with an enlarged diameter. DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. In FIGS. 1 and 2, an outer ring 1, which is a first ring member, has a leg portion 12 and a body portion 11 formed on the body. There is. For example, one end of the cylinder is used as the body part 11 of the outer ring 1, and a notch is provided in the length direction of the cylinder to form the leg part 12. A cutout 14 is provided near the connection between the body N; 11 and the leg portion 12. The slider ring 2, which is the second ring member, has a leg portion 22.
is formed integrally with the body portion 21. For example, one end of the cylinder is made into the slider ring 20 body part 21, and a notch 23 is provided in the length direction of the cylinder to form the leg part 23. A taper 121 is formed at the end of the outer ring 1, and a J-bar 211 is formed at the tip of the 11th part of the slider ring 2, so that the body 21 of the slider ring 2 can be easily inserted into the outer ring 1. (3rd
and Figure 4). A guide 24 is provided on the outer surface of the slider ring 2 in the length direction.
However, at the end of the slider ring 2, a taper 221 is provided with a number J. A tension member 4 is fixed to the anchor head 3. A guide 32 is provided in the length direction on the outer surface of the anchor head 3, and a taper 31 is provided at the end of the outer surface of the anchor head 3. The inner wall of the ring 1 is attached to the guide 2/I provided on the outer surface of the slider ring 2, and the inner wall of the slider ring 2 is attached to the guide 32 provided on the outer surface of the anchor head 3.
The operation and usage of the earth anchor A of the present invention are as follows. The ground to be defined for the earth anchor of the present invention is not particularly limited, but includes, for example, Sunaki, Regi layer, and Koku11Il! ! 1
In particular, it is desirable to use rock such as hard rock, hard rock, soft rock, etc.) Even weathered rock is relatively strong and does not turn into sand when a hole is drilled. For example, when the ground to which the earth anchor is to be anchored is made of hard rock, first drill a hole in the hole to a specified length, or drill a hole in the blue hole to a specified diameter. : ? A primary drilling portion is formed in the Itt layer. Next, to form a hole-expanding portion in the rock layer, a hole-expanding bit developed by the present inventor is used. This hole expanding bit is shown in Figures 6 and 7.
There is C in the diagram as agreed (Patent application No. 477f)
. That is, this hole enlarged hole is pivoted at an acute angle toward the inside of the bit body, and the cutting edge 114 is freely retracted from the outside of the bit body.
and the blades are mounted downward.
an enlarged diameter piston 103 connected to the drive shaft 104 and capable of moving the blade 112 within the bit body;
A piston heavy base 105 with a stone attached to the end of the bit body, a crown IIR4 connected to the end of the bit body, and a crown IJ member 106, and the cutlet mounting were taken in part @106. Consists of Crown 107. The crown 107 is attached to the outer peripheral surface 13 at the bottom of the primary drilling hole in the rock layer.
2, the cutting edge 114 protrudes out of the bit body to drill an expanded hole in the 218 layer, and the piston 103 reaches the bismine mark 105 and stops (FIG. 7). In this state, the drive shaft 104 is rotated to drill a hole with a predetermined length. After drilling a hole of a predetermined quality, coupler 108 is attached to drive shaft 104 and jg! When the tied rod 109 is pulled up, the contact with the outer circumferential surface 132 of the piston 103 is released, and the enlarged diameter blade 112 is pulled up with the second hole bit in the state.・Push the casing into the cut hole. Next, the earth anchor 8 is placed inside the casing in the state shown in FIGS. 2 and 4, that is, the tension member 4 is fixed to the anchor head 3, and the slider ring 2 and then the outer ring 1 are attached to the body 12 of the outer ring.
Insert until it hits and cover. -Cement 1 in the cut hole and expanded hole
~Inject the millimeter under no pressure. Before the lement milk is assimilated, pull up the tensile material 4 with a jack and C anchor head 3.
When the slider ring 2 is moved up and down while sliding along the inner wall of the slider ring 2, the slider ring 2 is attached to the anchor head 3.
The slider ring 2 and the outer ring 1 expand in diameter at the enlarged hole part of the first layer while sliding along the inside +5 of the outer ring 1 (see Figs. 1 and 3).
figure). 1 Novo-1 ~ Pipe, then pull out the casing, and feed the cow. In this way, the wedge force R is caused by the pulling force P
occurs, and the outer ring 1, slider ring 2, and anchor head 3 are pressed against the hole wall of the expanded hole portion of the fAa layer. The anchor tensile force P can be maintained by the support R force Q of the outer surface of the anchor integrally against the hole wall, the wedge force R, and the support Tq by the crimp effect of the grout between the outer ring 1 and the hole wall of the enlarged hole portion. Earth anchor A of the present invention
Then, the anchor strength can hold several hundred 1/tree, and a small one r b 2! 'j Ol / There are more than 1 books. In this way, in order to use the anchor as a permanent structure, a process is carried out to corrode the rutal etc. in this manner. In other words, if there is a ground or sand layer C, polling 7
Make a thin hole and insert it into the earth anchor,
Lemen 1 - Add milk and add 1'T lutare 1'i-i
+Enter 1, pull the tensile shrine 4, -next tension line 11
'') '('i' After inserting the anchor into the IC, harden the area around the fixing part to create a hard /ntsuk area.Next, perform the anchor construction by tightening the (■))' Effects of the Invention According to the present invention, (1) Anchor constant 6 force is hard ground or skin f + horn, wedge force, ring part +4 and 1v,
/l of the hole, ! J: Ru support 1 for the crimping effect with 7? (2) The wedge force is proportional to the pulling force, and the pressure on the ground due to the wedge force is
1 ■ (<26 people / ``Ru, (3) In order to remove one ring member, J, Su, again [, 1. To use multiple ring members,'', ri on hard ground. Tolerance 1: Can be easily adapted to early contraction displacement, (4) Anchor ml is easy and reliable, (5) Handling resistance can be obtained immediately by tensioning the tension material, so the curing period can be shortened. (6) The structure of the anchor is simple, and the anchor unit does not break even under large tensile force. 4. As shown in the drawings. BRIEF DESCRIPTION FIGS. 1 and 2 show the earth ann) of the present invention
This is an explanatory diagram showing the state in which the diameter of the earth anchor 8 is expanded in the expanded hole part of the Y-plate and the state before the diameter is expanded. 2A and 2B are cross-sectional views of the earth anchor of the present invention, respectively, showing the state in which the diameter of the ground wire is expanded and the state before the diameter is expanded. FIG. 5 is an explanatory diagram for explaining the effects when using the earth anchor of the present invention. Figures 6 and 7 show a hole-expanding pit used when drilling a hole-expanding section in a rock layer. Do you see the state in which the diameter blade protrudes outside the bit body? It is lb. A... Earth anchor 1... First ring member (
Outer ring) 11... Torso 12... Leg 2
...Second ring member (slider ring) 21...
・Body part 22...Leg part 3...Anchor head 4・
...Tension shrine 1] ...Anchor pull 4B pulling force Q...
・Bearing force against the hole wall R...Squeezing force B...Hole expansion bit 1 (]1...Hitor body 111...-Route installation () window 112...Diameter expansion blade 114・・
・Blade tip 103...Diameter expansion piston = 145-

Claims (1)

[Claims] A ring member whose diameter can be expanded freely, consisting of a body and legs connected to or integrally formed with the body; 1. An earth anchor whose diameter can be freely expanded, comprising an anchor head and a tensile member fixed to the anchor head.