KR900003143B1 - Earth ancher method and earth ancher - Google Patents

Abstract

A grout pouring member (1) is made of a pouring pipe (11) and a packer (20). The pouring pipe has longitudinal discharge holes (111). The inflatable packer envelops the pouring pipe. The front of the packer is closed seamlessly. And a grout inlet pipe (141) and a tension member (12) are inserted in the rear of the packer.

Description

Soft Anchor Earth Anchor Method for Soft Ground and Soft Ground Grout Injection Member

1 is an explanatory diagram of a soft ground grout injection member of the present invention.

2nd pressurize the filler material into the packer. Explanatory drawing of the grout injection member for soft grounds explaining the state when it was charged.

3 to 7 are process explanatory diagrams of acupressure type earth anchor method in the soft ground of the present invention.

* Explanation of symbols for main parts of the drawings

1: grout injection member

11: grout injection pipe 12: tensioner sheath pipe

13: anchor support plate 14: injection capsule

15: tensioning fixture

20: Packer

21: Binding unit of packer to grout injection pipe

111: grout discharge hole 141: grout injection container

142: sea-pipe insertion port 143: joint screw

144: connection pipe

The present invention relates to an acupressure type earth anchor method for soft ground and a grout injection member for soft ground used in the method.

Conventionally, as an earth anchor method, a method of inserting an anchor cable into a boring hole, pressurizing and injecting mortar into a fixing part, and supporting a load from a structure by the strength of the mortar and the hollow wall has been used. In the case where the fixing ground is a soft ground, the injection into the surrounding ground of the injection material does not become a uniform shape, and it becomes extremely large and small, so that a share of constant adhesion strength is not obtained. This will continue and continue to happen throughout the battlefield.

In addition, the presence of water at the anchorage causes deterioration in the quality of the injection material, and the desired adhesion strength is not obtained.

Also, in soft ground, bento-nite slime adheres to the injection material around the void, so that the adhesion strength between the injection material and the hollow wall is remarkably reduced, and thus the desired design pull-out load. There is a need to significantly lengthen the settlement length so that this is not achieved.

In addition, there is a method of using an anchor core as an acupressure-type anchoring method, but in order to endure the tensile load, the present inventors have shown that the diameter of the core must be at least about three times the digging diameter. As known by the above-described conventional methods, it was impossible to realize this magnification (substantial mirror).

The present invention is to solve the above problems (problems) and to provide a ground grout injection member for soft ground that allows the composition of the anchoring fixture in the soft ground and an earth anchor method using the same.

That is, the present invention is generally free from boring holes having a corresponding depth of anchor free length and anchor fixing length in the soft ground, and without a grind in which a grout injection pipe and a tension member are mounted. The expandable packer is inserted into the anchorage length area, and the mortar or cement milk is injected from the grout injection pipe into the packer to expand the packer while expanding the anchor hole, and the mortar or cement milk is It relates to acupressure earth anchor construction method in soft ground, characterized in that it is characterized in that it is ignited, and the packer is made by expanding the anchor hole by injecting grout material into pressure and solidifying in this state. It is characterized by forming an anchor fixer (bonded anchor) having a diameter larger than that of the anchor hole.

The present invention also provides a grout injection pipe having a grout discharge hole opened in a longitudinal direction, a tension member inserted into the grout injection pipe and fixed at an end thereof, and the grout injection pipe being inserted and closed at one end thereof. A grout injection member for use in acupressure-type earth anchoring method for soft ground, comprising an inflatable packer with no inclined grout injection pipe, wherein the injection member of the present invention is acupressure-type anchor In particular, the present invention provides a grout injection member for use in the formation of a grout pipe and a packer that is expandable and crushed, that is, pressed and not broken or crushed.

First, an embodiment of the grout injection member used in the present invention will be described with reference to FIG.

The grout injection member 1 has a grout injection pipe 11 having the grout discharge hole 111 opened in the longitudinal direction, and the injection pipe is inserted, one end is closed, and the injection pipe is mounted at the other end. It consists of a conventional inflatable packer 20 which is free of decay.

The grout injection member 1 according to another embodiment of the present invention includes a grout injection pipe body 11 having a grout discharge hole 111 formed in a longitudinal direction, a tension material si-pipe 12 inserted into the injection pipe, An injection capsule 14 having the insertion hole 142 of the seap-pipe and a grout inlet 141, which is fixed at one end of each of the injection pipe 11 and the seappipe 12 The grout injection pipe 10 and the grout injection pipe, which consist of an anchor support plate 13, a tension fixing tool 15 fixed to the support plate, are inserted, and both ends of the anchor support shaft and the injection capsule side are respectively inserted. It consists of a normally expandable packer 20 with no obstruction mounted on it.

The packer 20 used in the present invention is made of a normal (cylindrical) expandable fabric which is not inclined with a needle or the like. For example, a knitted fabric made of Maryas knitting is thin and usually has no center. have.

In the tension stock fixing tool 15, screw grooves are squared on the inner wall, and the tension members 21 are screwed together.

A joint screw 143 is placed in the injection cylinder 141 of the injection pipe 11 so that the connection pipe 144 for supplying the grout material can also be connected.

The outer side of the grout injection member 10 is covered with the heat seal film 30, and the packer 20 is protected.

The packer and the grout injection pipe 11 may be wound by winding a tape to be in close contact with each other.

When the grout injection member 10 of the present invention is used, the injection pressure of the grout material into the packer 20 is, for example, 5-10 kg / cm ^{2. With} this injection pressure, the packer 20 expands in the soft ground, It is compressed and consolidated. For example, the grout injection member 10 inserted into the diameter 116-160mm / boring hole in the soft ground below N-value 15 is also used for the softer ground of the soft ground. It has been confirmed by the present inventors that the expansion results in piles having a diameter of 400-800 mm or more than 800 mm.

EXAMPLE

Boring holes are cut in the soft ground, and the casing 3 is inserted into the boring holes to a depth corresponding to the non-fixed part length L ₁ and the fixing part length L _2. (See FIG. 3)

On the other hand, a tension agent 121 is inserted into the tension member sea-pipe 12, the tip portion thereof is screwed into the tension fixing fixture 15, and the connection pipe 144 is attached to the grout injection cylinder 141. The grout injection member 10 is assembled by screwing in and joining the joint screw portion 143. (FIG. 4)

Next, the grout injection member is inserted into the casing, inserted into the fixing unit (FIG. 4), and the casing 3 is drawn out by the length of the effective fixing portion, leaving the length of the non-fixing part (FIG. 5).

The grout material G is charged from the injection pipe 11 to the packer 20 by high pressure, and the packer 20 is expanded. (FIG. 6) The casing 3 is drawn out and left to stand. It solidifies and acupressure type | mold anchor body (A) is formed. The connecting pipe 144 is lifted out, and the tensioning agent 121 is tensioned and fixed to complete the anchoring. (FIG. 7) In the case of the permanent anchor, mortar or cement milk is placed in the hole (hole) after the casing is pulled out. Inject by car and rust preventive measures.

According to the present invention as described above, the filling material can be filled almost uniformly throughout the packer. Since the filling material is accommodated in the packer, the filling material is not dispersed or dissipated in the soil and is effectively used. The packer can cope freely with any deformation of the ground, and the pressure-type anchor is formed by high-pressure filling and pressure-expanding such as grout material, so that the moisture of the injected material is extruded out of the packer, and the water / cement ratio is reduced. Anchor body has extremely high strength, good affinity with surrounding ground, acupressure type anchor with large magnification for digging, and can be easily and reliably formed. This easy point, the simple construction equipment and the maneuverability can have a great effect.

Claims (2)

The boring hole (3) is cut into the soft ground to a length corresponding to the anchor free length (L ₁ ) and the anchor fixing length (L ₂ ), and the grout injection pipe (11) and the tension member (12) are cut. An ordinary expandable packer 20 having no mounting position is inserted into the anchorage length region, and mortar or cement milk G is pressurized into the packer from the grout injection pipe 11. And an anchor ball to expand the packer and to solidify the mortar or cement milk in this expanded state. Acupressure type earth anchor method in soft ground. The grout injection pipe 11 having the grout discharge hole 111 opened in the longitudinal direction, a tension member 12 inserted into the grout injection pipe and fixed at an end thereof, and the grout injection pipe inserted and closed at one end thereof. The other end is a soft ground grout injection member for use in the acupressure-type earth anchor method for soft ground, characterized in that it is composed of an inflatable packer (20), which is not inclined to the grout injection pipe is mounted.

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