KR100950593B1 - Method for constructing double enlargement bearing type permanent ground anchor - Google Patents

Abstract

PURPOSE: A construction method for a double-extendable bearing permanent ground anchor is provided to improving anchorage with a wedge by grouting a mounting part. CONSTITUTION: A construction method for a double-extendable bearing permanent ground anchor comprises following steps. A boring hole(1) is punched underground(S10). A double-extendable bearing permanent ground anchor is inserted into the boring hole(S20). A deep-seated blockade packer(50) of the double-extendable bearing permanent ground anchor is filled with milk in order to seal the boring hole(S30). A tension member(60) of the double-extendable bearing permanent ground anchor is tensed and a wedge(30) is expanded and is stuck underground(S40). A first grout(G1) is mounted in a space between an inner lower body(20) and a wedge and the boring hole of the fixed head(S50).

Description

TECHNICAL FIELD [0001] The present invention relates to a method for constructing a double anchor type permanent anchor,

More particularly, the present invention relates to a double-acting pressure-sustaining permanent anchor, and more particularly, to a bending force against a ground pressure generated by an anchor action by a wedge so that all portions of the wedge are buried in the ground, To a double expansion type compression-applied permanent anchor construction method capable of increasing support rigidity.

In general, permanent anchors are used for prevention of disintegration of incision surfaces such as incisions, stabilization of slopes, prevention of injury caused by underground water in large underground structures such as buildings or dams, prevention of collapse of excavation walls in underground construction work of large buildings, It is installed to prevent movements and distortions of buildings such as earthquake-generating sites and large-scale steel towers.

A general anchor method is to drill a drilling hole using a perforator on the ground where collapse is likely to occur and insert a grout hose, a plurality of tensile materials and an inner lower body as one unit, insert the grout hose When the grout is cured together with the inner bottom body, the fixture is fastened to the other end of the tensile material, and then the tensile material in the strand is tensioned by hydraulic equipment or the like to stabilize the target structure.

These general anchors support the tensile force from the surface due to the friction between the grouting and the ground.

In the anchor method, the anchor component is divided into a fixation part that exhibits a required frictional force, a free part that transmits frictional force exerted by the fixation part, and a fixture that allows the required frictional force to act on the structure. Among these components, the fusing part is determined by the frictional resistance between the ground and the cement grout, cement grout and tensile material. The free portion used in the anchor method may be made of a tensile material, for example, a wire rope coated with a plurality of twisted steel wires.

However, the anchor according to the prior art has the following problems.

The anchor according to the prior art is to provide a supporting stiffness against drawing by the frictional force between the grout and the ground. There are a lot of joints around the excavation hole in which the anchor is inserted according to the state of the ground. Therefore, since the grout is filled with the injection pressure, when the grout is injected into the excavation hole, the grout leaks from the excavation hole through the joint and the filling rate in the excavation hole is lowered, so that the ground can not be substantially reinforced. At this time, even if the joint is formed only in a part, since the entire area inside the drilling hole is one space, voids are generated in the grout filled in the entire area of the drilling hole, so that the reinforcement is not performed. Because there is no way to measure the strength of the inside of the excavation hole, construction can proceed without recognizing the state of existence of pores. As a result, a large accident due to the ground collapse may occur.

In addition, since the outer circumferential surface of the anchor is generally flat, a separation phenomenon occurs between the grout and the anchor, so that the anchor is pulled out from the excavation hole when the tensile material is pulled, and as a result, the ground is collapsed.

In addition, since a concentrated load is applied to the leading end fixing part, the fixing part is structurally unstable and the length of the fixing part is increased.

However, if the fixing section is lengthened, there is a problem such as unit cost and difficulty in construction.

To solve such a problem, a technique has been proposed in which a wedge is embedded in the ground to provide an anchor support force.

Since the wedge type anchor has only one inclined portion and the wedge is operated, the wedge does not expand as a whole when the tensile material is pulled, Therefore, although only the rear end of the wedge is stuck in the ground, the supporting force is very weak and it is said that the grouting is not performed. However, even if the wedge force is secured substantially, There is a problem that the anchor is detached from the excavation hole.

In the conventional wedge type anchors, a space is formed between the wedge and the inner lower body inside the wedge, so that the support base of the wedge is very weak. Accordingly, the earth pressure is concentrated on the contact portion (line contact) between the wedge and the inner lower body There is a problem that the wedge is broken.

Further, since the pressure plate is provided so as to be in surface contact with the ground surface, there is a problem that the pressure plate easily separates from the excavation hole due to external force.

Also, when the tensile material is stretched, a slip occurs between the tensioner and the tensioning head, so that the tensile material can not be normally tensioned.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a method of reinforcing a ground by extending a pair of wedges, And to secure a fixing force together with the wedge by grouting the fusing part on the inside of the excavation hole, thereby providing a double expansion type permanent anchor construction method.

It is another object of the present invention to prevent the pressure plate from separating from the excavation hole.

It is another object of the present invention to prevent slip between tensioner tensioner and tensioner head using a tensioner.

According to an aspect of the present invention, there is provided a double expansion type pressure-sensitive permanent anchor construction method including: a stationary head; An inner bottom body fixed to the rear of the fixed head, the inner bottom having a cylindrical structure having a hollow portion opened on both sides thereof; A pair of wedges joined to the outer periphery of the inner lower body so as to be opened so as to be engaged with the ground when the inner lower body is pulled out; A puncher installed at a rear side of the wedge and expanding through a milk filled therein to guide the excavation hole to seal and expand the wedge without being pushed rearward; And the at least one tensile material which penetrates the undercut body and penetrates the inner bottom body and is fixed to the fixed head and the rear end thereof is connected to a tensioner on the ground side to pull out the fixed head and the inner lower body through the tensioner, Type permanent anchor is inserted, and a process such as a tensile-grout process is included.

According to the double-expansion type pressure-sensitive permanent anchor construction method according to the present invention, when the tensile material is tensioned, the rear end portion of the wedge does not spread like a wing around the front end portion, In addition, it is possible to effectively reinforce the ground, and in the case of the presence of joints in the ground or in the case of the soft ground, it is possible to effectively reinforce the ground, thereby preventing a safety accident.

By grouting the space between the wedge and the inner lower body and the excavation hole in front of the fixed head, the ground can be more stably reinforced by increasing the supporting force and fixing force of the wedge and dispersing the earth pressure transferred to the wedge to prevent the wedge from being damaged can do.

In addition, since the tensile machine is connected to the tensile head by the concave / convex type and is not slipped on the tensile head when the tensile head is stretched, the convenience of the tensile work can be secured.

As shown in FIGS. 1 to 3, the double-expansion type pressure-sensitive permanent anchor 100 according to the present invention includes a fixed head 10, an inner bottom body 20, a pair of wedges 30, A ring 40, a puncher 50 for blocking the first foot, a tensile material 60, and a pressure plate 70 as a set.

The fixing head 10 is engaged with the inner bottom body 20 while the tension member 60 is connected. The fixed head 10 is made of steel or the like as a cylindrical block having a plurality of holes formed therein through which the tension members 60 are passed.

The fixed cap 11 may be coupled to the front of the fixed head 10 or may be integrally formed.

The fixed cap 11 is coupled to the front side of the fixed head 10 and has a substantially streamlined cross-sectional cap shape opened to one side so as to prevent the tensile material 60 from being exposed to the outside, and has at least one grease injection port 11a and an exhaust port 11b. And may be made of a synthetic resin material, and may be referred to as an accessory of the stationary head 10.

The present invention fills the grout between the wedge (30) and the inner bottom body (20) and the fusing part in front of the fixing head (10) by grouting, which can be done by the injection tube (13).

The injection tube 13 penetrates the pack shrinking support ring 40 and is disposed at the rear of the inner bottom body 20 with the distal end portion of the inner tube 20 and the first grout G1 after the wedge 30 is extended. Is filled in the space between the wedge (30) and the space in front of the fixed head (10).

The injection tube 13 is of a double structure in order to confirm the injection, that is, has a double tube structure so that when the first grout G1 is completely filled in the fusing part, it is discharged to the ground side end.

The inner lower body 20 has a cylindrical structure in which a hollow portion is formed so as to penetrate the tensile material 60 and is fixed to the rear of the fixed head 10. [

The inner lower body 20 has a first inclined portion 21 inclined downward so as to have a smaller cross-sectional area from the side of the fixed head 10 on the outer circumferential surface, And a guide portion 23 protruding from both sides of the outer circumferential surface so as to have a smaller cross sectional area and supporting the pair of wedges 30 in a surface contact state.

A horizontal portion 24 may be formed between the first and second inclined portions 21 and 22. The horizontal portion 24 can be selectively formed as needed.

The guide portion 23 supports both sides of the pair of wedges 30 and keeps the wedge 30 in surface contact with the wedge 30 while the wedge 30 is extended to continuously support the wedge 30, So that the wedge 30 can be prevented from being broken and the wedge 30 can be stably expanded and the wedge 30 can be prevented from being twisted to the left and right.

The inner lower body 20 can be manufactured by casting or the like, and the first and second inclined portions 21 and 22 are formed in a circular cross section on the outer peripheral surface.

The pair of wedges 30 are joined to the peripheral portion of the inner bottom body 20 to form a source, each of which is a curved arc-shaped cross section.

Since the pair of wedges 30 are coupled to the periphery of the inner bottom body 20, the width of the wedge 30 is increased from one side (the mounting reference reference head 10 side) to the other side. Third and fourth inclined portions 31 and 32 having the same angle as the first and second inclined portions 21 and 22 are provided.

The pair of wedges (30) are coupled to the inner bottom body (20) through the binding band (33). The binding band 33 has a strength that is broken by the force of the inner bottom body 20 when the inner bottom body 20 is pulled out.

The third and fourth inclined portions 31 and 32 of the wedge 30 are formed with the horizontal portion 34 being the same as the horizontal portion 24 of the inner bottom body 20 therebetween.

The rear end of the wedge 30 having such a structure is supported by the deep cut blocker support ring 40 while the free ends of the wedge 30 are slidably supported on the guide portion 23 of the inner bottom body 20.

The pack shrinkable packer support ring 40 seals the front opening of the pack shrink bag 50 so that the milk M filled in the pack shrink bag 50 is not leaked, The wedge 30 is provided to support the wedge 30 when it is pulled out to the ground so that the wedge 30 is not drawn out to the ground but spreads in the ground. The wedge 30 is spaced from the rear end (ground side end) ).

The deep-focal occlusion packer 50 is made of fabric or the like and is sewn, for example, so that both sides thereof are opened. The openings disposed on the front side of the packs 50 for blocking the forklifts 50 are positioned inside the openings on both sides so as not to leak through the openings on both sides of the packs 50, Through one or more fasteners (51).

The tensile material 60 is fixed to the stationary head 10 with its distal end penetrating through the deep-focus blocking packer 50, the packer support ring 40 for blocking the center of gravity, the inner lower body 20 and the fixed head 10, (Not shown) and pulled out of the stationary head 10 and the inner bottom body 20. [0031] As shown in FIG.

The free end of the tensile material 60 is supported on a support plate 70 which will be described later through a tension head 61 and tensioned by a tensioner connecting groove (61a) is formed.

At the entrance side of the excavation hole 1, a support plate 70 is provided.

The pressure plate 70 has a plate-shaped pressure-applying portion 71 which is seated on the ground surface of the entrance side of the excavation hole 1, a tubular-shaped pressure-applying portion 71 extending toward the one side of the pressure- And the supporting portion 72. Since the supporting portion 72 is inserted into the excavation hole 1, there is an advantage that the supporting plate 72 can maintain the installed state.

As shown in FIG. 4, the construction method of the dual expansion type pressure-sensitive permanent anchor according to the present invention is as follows.

(S10) drilling the drill.

The digging hole (1) is drilled in the ground using an excavator. Depending on the state of the ground, the quantity and tensile force of the anchor 100 will vary, and the drilling hole 1 is drilled according to the designed quantity of the anchor 100.

(S20) Anchor insertion.

The anchor 100 of the present invention is inserted into the excavation hole 1, respectively. The pair of wedges 30 are coupled to the inner bottom body 20 by the tie straps 33 so that the wedge 30 is not separated from the inner bottom body 20 when the anchor 100 is inserted.

Insert the fixed head (10) to the inside of the drill hole (1).

When the insertion of the anchor 100 is completed, the pressure plate 70 is installed on the entrance side of the excavation hole 1. The support 72 of the support plate 70 is inserted into the drill hole 1 and the support plate 70 is installed so that the support portion 71 is brought into close contact with the paper surface.

(S30) Excavation hole sealing.

And the inside of the deep-focal occlusion packer 50 is filled with milk (M). The milk M is not leaked to the outside of the deep-focus blocking pluger 50 even if the filling pressure is large because the front opening of the deep-focal blocking packer 50 is curled inward.

As the milk (M) is filled, the deep-block closure packer (50) expands and is brought into close contact with the inner wall surface of the excavation hole (1). The filling state of the milk (M) can be confirmed through the milk (M) flowing backward to the ground.

(S40) tensile material tensile.

When the tension member 60 is tensioned, the fixing head 10 and the inner lower body 20 are pulled back to the ground side. At this time, the first and second sloping surfaces 21 and 22 of the inner lower body 20 and the wedge The wedge 30 is extended through the third and fourth inclined faces 31 and 32 of the first and second wings 30 and 30. The stretching force of the wedge 30 due to the tensile force of the tension member 60 is greater than the strength of the strap 33 so that the strap 33 is broken and does not constrain expansion of the wedge 30. [

In addition, the wedge 30 receives and guides the guide portion 23 together.

That is, since the wedge 30 extends through the two inclined portions (the first and third inclined portions 21 and 31, the second and fourth inclined portions 22 and 32) formed in the longitudinal direction, So that all parts can be embedded in the ground.

(S50) Grouting of the fixing part.

When the first grout G1 is injected through the injection pipe 13, the first grout G1 is inserted between the inner bottom body 20 and the wedge 30 and the space between the inner bottom 20 and the wedge 30, And is then fixed. The cured first grout G1 disperses the pressure transferred through the wedge 30 because it fills the space between the inner bottom body 20 and the wedge 30.

(S60) Free grouting.

When the fixation of the fixed head 10 and the inner bottom body 20 is completed, the second grout G is filled in the free space behind the quick-block closure packer 50 to seal the excavation hole 1.

Thus, the construction of the ground reinforcement by the anchor 100 is completed.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view of a double expansion type compression-type permanent anchor according to the present invention; Fig.

FIG. 2 is an exploded perspective view of a double-expansion type pressure-sensitive permanent anchor according to the present invention. FIG.

3 is a cross-sectional view of a double expansion type pressure-sensitive permanent anchor according to the present invention.

FIG. 4 is a view showing a construction process of a double expansion type pressure-sensitive permanent anchor according to the present invention. FIG.

Description of the Related Art [0002]

1: excavation hole, 10: fixed head

11: fixed cap,

13: injection tube, 20: inner lower body

21, 22, 31, 32: first to fourth inclined portions, 23:

24, 34: horizontal portion, 30: wedge

40: packer supporting ring for deep-focal occlusion, 50: packer for deep-focal occlusion

60: tensile material, 70:

Claims (5)

delete delete delete delete A first step of drilling the excavation hole (1) in the ground; A fixed head (10); A fixed cap (11) which is open toward one side and has one or more grease injection ports (11a) and an exhaust port (11b) and is coupled to the front side of the fixed head; An inner lower body (20) having a cylindrical structure with a hollow portion opened on both sides thereof and fixed to the rear side of the fixed head; A pair of wedges (30) coupled to the outer periphery of the inner lower body so as to be widened, The inner bag body is restrained by a predetermined distance from the inner lower body and is supported on the inner wall of the excavation hole in the ground so that the inner bag body does not move backward beyond a predetermined distance, and; Closing cover (50) which is installed at the rear of the packer supporting ring for closing the forklift and which expands through a milk (M) filled therein to seal the excavation hole; Wherein the head shrinking packing packer, the pack shrinking packer supporting ring and the inner bottom body are fixed to the fixation head while the distal end thereof is connected to the tension unit on the ground side and the fixation head and the inner lower body are pulled out through the tension unit A tensile material 60; (70) installed at the entrance of the underground excavation hole and in which the tensile material is supported by the penetration and tensioner; A tensioning head (61) supported by the platen and to which the free end of the tensioning material is fixed; And an injection pipe (13) of a double pipe structure in which a tip end portion of the inner pipe is inserted into a rear ring of the inner lower body and a first groove (G1) The lower body has a first inclined portion 21, a second inclined portion 22 inclined at the same angle as the first inclined portion from the end of the first inclined portion, and a second inclined portion 22 inclined downward from the end of the first inclined portion, And a guide portion (23) having a triangular cross section protruding from both sides of the outer circumferential surface so as to have a smaller cross sectional area and supporting the pair of wedges, wherein each of the pair of wedges has a curved arc- And the third and fourth inclined portions 31 and 32 having the same angle as that of the first and second inclined portions of the inner bottom body are provided on the inner circumferential surface of the inner lower surface. Both sides of the third and fourth inclined portions 31 and 32 are supported by the guide portion of the inner bottom body, core And a double expansion type compression permanent anchor supported on the occlusive packer support ring and having all the portions thereof equally spread through the first to fourth slopes when the inner bottom body is pulled out, In a second step; A third step of sealing the excavation hole by filling the inside of the deep-focus blocking packer (50) of the double expansion type pressure permanent anchor provided through the second step with milk (M); After the third step, the tension member 60 of the double-expansion type pressure-sensitive permanent anchor is pulled so that the fixing head 10 and the internal member 20 of the double-expansion type pressure-sensitive permanent anchor are pulled toward the ground side, A fourth step of exposing the wedge 30 to the ground through the first and second inclined surfaces 21 and 22 of the wedge 30 and the third and fourth inclined surfaces 31 and 32 of the wedge 30; The first grout G1 is filled in the space between the inner bottom body 20 and the wedge 30 and the excavation hole 1 in front of the fixed head 10 through the injection pipe of the double expansion type pressure- A fifth step of fixing the image to the original image; And, And a sixth step of sealing the excavation hole by filling a second grout (G) behind the center-of-occlusion packer (50) of the double-expansion type pressure-sensitive permanent anchor .

Images