KR101358994B1 - Construction method of multi extending permanent anchor - Google Patents

Abstract

The present invention relates to a construction method for a multiply extendable permanent anchor to maximize bearing power using the frictional resistance of an anchor body and the bearing pressure of an extending anchoring part by multiply extending an anchor using a first extending wedge and a second extending wedge and separating the top and the bottom of the extending wedges from each other at regular intervals. [Reference numerals] (AA) Extending hole forming step; (BB) Anchor insertion step; (CC) First extending step; (DD) Second extending step; (EE) Third extending step; (FF) Grouting step; (GG) Finishing step

Description

Construction method of multi extending permanent anchor}

The present invention relates to a multi-expansion permanent anchor construction method, which is expanded in multiple by the primary expansion wedge and the secondary expansion wedge, the upper and lower portions of the expansion wedge is spaced at equal intervals so that the frictional resistance of the anchor body and expansion anchorage portion The present invention relates to a method for constructing a multi-expansion permanent anchor that maximizes bearing capacity by exerting bearing pressure.

Ground anchors are classified into permanent anchors applied to permanent structures by duration and purpose, and hypothetical anchors generally used for less than 2 years. They are classified as friction, And are classified into tensile type, compression type dispersion type, compression type concentration type, and the like depending on the supporting method by the grout of the tensile material.

And it can be classified into PC steel wire anchor, steel wire anchor, buried anchor, and removal anchor depending on the type of tension material and usage purpose.

As described above, in order to secure the tensile force, which is the most important reason why the ground anchor method is classified in various ways, the construction method and material selection should be performed according to the ground conditions.

Currently, the usual application procedure is as follows: a perforation hole having a diameter of about 105 mm is formed by a perforating machine, an anchor having a length of about 10 to 30 m is inserted into the perforation hole, then grouting is performed, The construction (wall) and the anchor are fixed, and the construction is carried out in order to stabilize the prestress by about 30 to 80 tons.

Since the tensile force is secured only by the cross-sectional area of the perforation and the grout, it is difficult to secure the tensile force because the frictional force is weak when the stratum is weak. Therefore, the construction period is delayed due to excessive design (increase in quantity) And increase the cost of construction, as well as bring about the risk of overburden displacement and collapse due to unreasonable construction.

In addition, there is a permanent anchor type which is called a compression anchor and is applied to the rock layer. It has the advantage of securing a tensile force even if the length is shorter than other anchors, but it is not applicable to a soft layer, And the additional process is excluded from the additional process due to the principle that the additional process is artificially applied to the additional process.

As a result, there has been a problem in that it is difficult to ensure a satisfactory workability in any stratum due to the lack of technical and economical advantages.

Above all, there is a problem that it is difficult to keep the frictional resistance by abutting against the air wall with only a part of the anchor body which is not extended at regular intervals.

As a technique for solving the above problems, there has been proposed a technique in which a plurality of (for example, two or more) anchors are provided on an outer circumferential surface of a pressurized anchor (a Korean Patent Registration No. 10-1222477, An insertion body inserted into the insertion hole of the cap, a support plate formed at the front end thereof, and an insertion protrusion formed at the rear end of the body, a body having a fastening groove for fastening the anchor body, a piercing body fastened to the front end of the body, The boss body is formed with an inclined surface corresponding to the inner surface of the shoulder portion of the bore hole, and an insertion groove having an inclined surface is formed at the center of the bore. And a plurality of guide grooves having guide shafts inserted therein are formed on the outer surface thereof.

When the anchor is inserted after forming the perforation hole vertically or inclined using the hammer bit, the end of the perforation hole is widened to form the hole having the shoulder portion. When the anchor is inserted, the weight of the anchor and the hole hole angle , The base plate of the impact bar installed at the tip of the body collides with the bottom surface of the hole of the expansion hole, and at this time, the insertion protrusion fastened to the rear of the impact bar vertically moves upward, and at the same time, When the strand is pulled upwards in this state, the frictional grooves formed on the outer surface of the bobbin body come up in a state that the frictional grooves are open, and then they are fixed to the inside of the shoulder portion of the borehole and then grout is performed.

However, the above-mentioned Patent Document 1 has a problem in that the opening body is widened by the wedge-shaped insertion protrusion or the widening of the wedge body is limited, and the adhesion of the friction groove of the wider body to the outer wall of the expansion hole is deteriorated.

In addition, there was a problem that can not control the gap between the expansion body.

In addition, in the "explosion-pressure anchor construction method" (Applied Korean Patent Publication No. 10-0993575, Patent Document 2) that the applicant has applied for and pre-registered, the expansion wings according to the impact of the slide bar by inserting the anchor in the expansion hole The composition was made in the order of grouting, magnetic field, and closing after fixing the plate to open.

The technique allowed the grout to be improved in quality by pre-grouting tensile strength.

However, the technique has a small contact area due to the small size of the extension wing, and moreover, since only the extension wing is made to be in close contact with the inclined portion of the expansion hole, the expansion hole ground is sufficiently weathered or crushed. There was a problem that can not exert support.

KR 10-1222477 (2013.01.09) KR 10-0993575 (2010.11.04)

The present invention is to solve the problems that occur in the prior art as described above, the first expansion by the first impact applied to the impact head, multiple anchors in the manner of secondary and tertiary expansion in accordance with the tension applied to the strand The expansion of the sieves is intended to provide a firm fit and friction support, not only for rock but especially for weathered or crushed ground.

In particular, by having a structure in which the upper and lower portions of the anchor body are expanded at equal intervals in the expansion hole, the frictional resistance between the anchor body and the hollow wall is evenly distributed, thereby exhibiting the maximum earth pressure and including the peripheral frictional resistance due to the grout. It is to be able to greatly improve the support capacity.

More specifically, a striking wedge, a first expansion wedge, and a second expansion wedge are connected to the upper, middle and lower portions of the striking bar, respectively. In the process of expanding the anchor body, a striking wedge, a first expansion wedge, a second expansion wedge The upper and lower portions of the anchor body are extended to a predetermined width so as to be evenly adhered to the main surface of the hole of the perforated hole by the contact with the upper, middle and lower portions of the anchor body, So that they can be evenly dispersed.

In addition, the upper inclined portion of the primary extension wedge moves upward through the inclined guide portion inside the anchor body when the impact bar strikes the bottom surface of the drilled hole, and the primary extension wedge is first expanded, and the anchor body is upward when tension is applied to the strand. The impact wedge expands in the second direction as it moves away from the upper part of the impact wedge insertion hole.In addition, tension is applied to the strand to expand the anchor body, and the wing catching jaw extends horizontally in the third direction while leaving the locking jaw insertion hole. By increasing the bearing capacity through the multi-expansion, as well as forming a jaw according to the third horizontal expansion to anchor the top of the anchor body in close contact with the top of the expansion hole to be able to exert a more solid support.

That is, the present invention maximizes the supporting force by multiplying the anchor body when the striking hole is struck by the anchor body, and when the stern body is drawn out, the upper and lower portions of the anchor body are evenly expanded, By extending horizontally and digging the ground, the upper end of the anchor body is caught on the ground, thereby increasing the frictional resistance of the anchor body, maximizing the ground pressure in the hole and providing the peripheral frictional resistance by grouting. .

In order to solve the above problems, the multi-expansion permanent anchor construction method of the present invention comprises: a shoulder portion 3 gradually increasing in diameter at a lower portion of the perforation hole 2 while drilling a target ground using expansion bits; An expansion hole forming step of forming an expansion hole 4 having a predetermined inner diameter in a lower portion of the shoulder 3; A multi-expansion in the horizontal direction, the anchor body 10 is formed with an inclined portion 12 inclined at the top, the striking bar 70 is provided below the anchor body 10, and the striking bar 70 And expands the anchor body 10 while moving inside the anchor body 10, and prepares a multi-expansion permanent anchor including a wedge to which the strand 1 is connected to the drill hole 2. An anchor insertion step of inserting into the interior; A first expansion step of firstly expanding the anchor body 10 while the wedge is moved into the anchor body 10 by hitting the impact bar 70 below the permanent anchor at the bottom of the expansion hole 4; The strands 1 connected to the wedges are first tensioned to raise the wedges so that the anchor body 10 is horizontally expanded in the second direction and the anchor body 10 is moved in the vertical direction so that the side wall surface of the anchor body 10 is A second expansion step of bringing the inclined portion 12 of the anchor body 10 into close contact with the shoulder portion 3 so as to be brought into close contact with the wall of the expansion hole 4; By tensioning the strand 1 secondly and further raising the wedge, the anchor body 10 is horizontally expanded in the third direction so that the side wall surface and the inclined portion 12 of the anchor body 10 are enlarged holes 4 and shoulders ( 3) the third expansion step to dig into the horizontal direction or to be in close contact with the expansion hole (4) and the shoulder portion (3) in the horizontal direction; Grouting step of curing by injecting grout liquid into the hole (2); It is configured to include; a finishing step of finishing the process by installing a cap on the upper hole (2).

At this time, the multi-expansion permanent anchor, a plurality of strand wire insertion hole 11 is formed in the vertical direction at the top, the inclined portion 12 is formed to be inclined so that the outer diameter gradually increases on the upper outer peripheral surface, the inclined portion 12, a plurality of tightening ring insertion grooves 13 are formed on the outer circumferential surface of the lower portion, and the tightening ring 13a is enclosed and installed therein. Sequentially, the impact wedge insertion hole 14 is formed in the upper locking jaw 14a, the locking jaw insertion hole 15 formed to be spaced apart from the impact wedge insertion hole 14, the inner diameter gradually increases in the upward direction The inclined guide portion 16a is inclined so as to be small, and the inner circumferential surface of the lower portion of the inclined guide portion 16a is composed of an expansion wedge guide hole 16 formed vertically, and a plurality of units (based on the central axis in the vertical direction) 10a) An anchor body 10 divided into; A strand guide groove 21 is formed in a vertical direction on the outer circumferential surface so as to be in line with the strand insertion hole 11 and the engagement protrusion 14a is formed on a lower outer circumferential surface, A striking wedge (20) formed with an engaging portion (22) protruding outward so as to be engaged with the striking wedge (20); Hole 31 is formed in a vertical direction so as to be in line with the strand insertion hole 11 and a first impact bar penetration hole 32 is formed at the center of the strut penetration hole 31, A wing-clipping jaw 30 formed with a wing; And an upper inclined portion 41 having an inclination angle equal to that of the inclined guide portion 16a is formed on the upper side of the upper wedge guide hole 16, A second vertical bar penetrating hole 43 is vertically formed at the center of the vertical bar 42 and the vertical bar 42 is vertically formed in the center of the vertical bar 42. The strand insertion hole 11, A primary expansion wedge 40 formed with a strand connecting hole 44 to which a lower portion of the strand 1 installed through the through hole 31 is connected; And a third striking bar through hole 51 is formed at the center of the third striking bar through hole 43 in a straight line with the second striking bar penetrating hole 43. A first inclined surface 52 inclined downward or inclined is formed on the whole or a part of the outer circumferential surface A second expansion wedge (50) having an upper portion connected to the primary wedge (40); And is connected to the lower end of each unit 10a of the anchor body 10 and has an enlarged wedge insertion hole (not shown) formed at the center thereof in a straight line with the third hitting bar through- 61 is formed on the upper wedge insertion hole and the extended wedge insertion hole has an extended wing finishing plate 60 having a lower inclined face 61a formed to have the same inclination angle as the first inclined face 52 of the secondary wedge, and; An upper part is connected to the striking wedge 20, and a lower part of the second striking bar 50 has a striking head 71 connected to a lower end while protruding outside the third striking bar through hole 51. Bar 70; characterized in that comprises a.

In addition, the first expansion step, the first inclined surface 52 of the secondary expansion wedge 50 is connected to the striking bar 70 by hitting the striking bar 70 of the lower permanent anchor to the bottom of the expansion hole (4) The upper inclination of the primary expansion wedge 40 connected to the secondary expansion wedge 50 to move upward through the second inclined surface 61a of the inner peripheral surface of the expansion wedge insertion hole 61 of the expansion wing closing plate 60. The portion 41 is raised in contact with the inclined guide portion 16a of the anchor body 10 so that the anchor body 10 is first expanded horizontally while maintaining an equal interval up and down, but above the striking bar 70. The blow wedge 20 is connected to move up until the catching portion 22 is caught on the catching jaw 14a. The second expanding step is to first stretch the strand 1 to the first extension wedge ( 40), the secondary extension wedge 50 is pulled upwards, and the primary extension wedge 40 rises on the inclined guide portion 16a while the anchor body 10 is horizontally expanded secondarily, and the blade The dog catching jaw 30 is pushed up and the wing catching jaw 30 has the upper end of the catching jaw insertion hole 15, while the anchor body 10 is moved upwards so that the anchor body 10 side wall surface expansion hole (4) It is in close contact with the wall surface, the inclined portion 12 is made to be in close contact with the shoulder (3), the third expansion step is the primary extension wedge 40, the secondary extension wedge (2) by tensioning the strand (1) secondary The primary extension wedge 40 is pulled upward 50 and the primary extension wedge 40 pushes the wing catching jaw 30 to move the wing catching jaw 30 to the upper portion of the catching jaw insertion hole 15. 3) the horizontal portion 42 of the lower portion is extended in the third horizontally to be in contact with the lower edge of the locking jaw insertion hole 15 so that the side wall surface and the inclined portion 12 of the anchor body 10 are enlarged holes 4. And it is characterized in that it is made to penetrate in the horizontal direction to the shoulder (3) or in close contact with the expansion hole (4) and the shoulder (3) in the horizontal direction.

According to the present invention, the rock body as well as the weathering is particularly severe or broken by expanding the anchor body in multiple ways in the second and third expansion according to the first expansion by the first impact applied to the striking head and the tension applied to the strand. In the case of the ground, it will have a strong adhesion and friction support.

In particular, by having a structure in which the upper and lower portions of the anchor body are expanded at equal intervals in the expansion hole, the frictional resistance between the anchor body and the hollow wall is evenly distributed, thereby exhibiting the maximum earth pressure and including the peripheral frictional resistance due to the grout. It is possible to greatly improve the bearing capacity.

More specifically, a striking wedge, a first expansion wedge, and a second expansion wedge are connected to the upper, middle, and lower portions of the striking bar. In the process of expanding the anchor body, the striking wedge, the first expansion wedge, and the second expansion wedge The upper and lower portions of the anchor body are extended to a predetermined width so as to be evenly adhered to the main surface of the hole of the perforated hole by the contact with the upper, middle and lower portions of the anchor body, So that it can be uniformly dispersed.

In addition, the upper inclined portion of the primary extension wedge moves upward through the inclined guide portion inside the anchor body when the impact bar strikes the bottom surface of the drilled hole, and the primary extension wedge is first expanded, and the anchor body is upward when tension is applied to the strand. The impact wedge expands in the second direction as it moves away from the upper part of the impact wedge insertion hole.In addition, tension is applied to the strand to expand the anchor body, and the wing catching jaw extends horizontally in the third direction while leaving the locking jaw insertion hole. As a result, the support force is increased through multiple expansion, as well as forming a jaw according to the third horizontal expansion, so that the upper end of the anchor body is stuck to the upper part of the expansion hole and can be more tightly supported.

That is, the present invention maximizes the supporting force by multiplying the anchor body when the striking hole is struck by the anchor body, and when the stern body is drawn out, the upper and lower portions of the anchor body are evenly expanded, By extending horizontally and digging the ground, the upper end of the anchor body is caught on the ground, thereby increasing the frictional resistance of the anchor body, maximizing the ground pressure in the hole and providing the peripheral frictional resistance by grouting. Can be greatly improved.

1 is a process chart showing a multi-expansion permanent anchor construction method according to the present invention.
Figure 2 is a cross-sectional view showing the expansion hole forming step in the present invention.
Figure 3 is a cross-sectional view showing an anchor insertion step in the present invention.
Figure 4 is a cross-sectional view showing a first expansion step in the present invention.
Figure 5 is a cross-sectional view showing a second expansion step in the present invention.
Figure 6 is a cross-sectional view showing a third expansion step in the present invention.
Figure 7 is an exploded cross-sectional view showing one embodiment of a multi-expansion permanent anchor used in the present invention.
Figure 8 is a cross-sectional view showing a state in which the strand is installed on the multi-extension permanent anchor used in the present invention.
Figure 9 is an exploded perspective view showing another embodiment of the secondary expansion wedge and expansion wing finishing plate in the present invention.
10 is a photograph showing an embodiment in which the striking wedge, the wing catching jaw, the first expansion wedge, the second expansion wedge is connected to the striking bar in the present invention.
11 is a photograph showing a state in which the components of FIG. 10 are inserted into the anchor body.
12 is a photograph showing the installation state of the components in the state in which the strand is connected to the primary expansion wedge in FIG.
Figure 13 and Figure 14 is a photograph showing an expanded state of the anchor body according to the movement of the primary expansion wedge and the secondary expansion wedge.

Hereinafter, the multi-expansion permanent anchor construction method of the present invention through the accompanying drawings will be described in detail.

The multi-expansion permanent anchor construction method of the present invention consists of an expansion hole forming step, an anchor insertion step, a first expansion step, a second expansion step, a third expansion step, a grouting step, and a finishing step.

1. Expansion hole formation step

As shown in FIG. 2, while drilling the target ground by using the expansion bit, a shoulder 3 having a diameter gradually increasing in the lower portion of the drilling hole 2 and a constant inner diameter in the lower portion of the shoulder 3 are provided. The expansion hole 4 is formed.

More specifically, using the expansion bit having a wing bit is fastened to the lower side of the bit housing to form a hole in the general rock layer or severe weathered or crushed ground.

First, the steel tube is installed in the ground to a predetermined depth, and then the hammer drill and the expansion bit are inserted into the steel tube, and then the inner side of the wing tube is inserted into the steel tube by tightening a protective cap projecting inwardly to the steel tube tip. To protect.

The expansion bit mounted on the hammer drill is lowered down along the inside of the steel tube, and the wing bit is lowered down to the lower part of the bit housing by its own weight.

In this state, when the expansion bit is lowered into the inside of the steel tube and passes through the protective cap and touches the ground, the wing bit protruding downward stops on the ground.

If the expansion bit is further lowered, the wing bit is extended outward.

In this state, when the bit housing is rotated, the wing bit protruding out of the outer diameter of the bit housing and the steel tube is rotated together to form as many holes as necessary for fixing.

The diameter and length of the drilling hole may be drilled in various forms according to the working environment.

The perforation hole may be both vertical and oblique perforation, and when obliquely perforated, the oblique angle is drilled obliquely downward by 15 °.

2. Anchor insertion step

A multi-expansion in the horizontal direction, the anchor body 10 is formed with an inclined portion 12 inclined at the top, the striking bar 70 is provided below the anchor body 10, and the striking bar 70 ) And expands the anchor body 10 in multiple directions while moving into the anchor body 10, and prepares a multi-expansion permanent anchor including a wedge in which the strand 1 is connected.

The prepared multi-expansion permanent anchor is inserted into the drilling hole 2 as shown in FIG.

An embodiment of a preferred permanent anchor is shown in the accompanying drawings.

The permanent anchor of the accompanying drawings is a bar of a new concept that does not exist previously, will be described in more detail below.

Permanent anchor used in the present invention is largely anchor body 10, hitting wedge 20, wing catching jaw 30, primary expansion wedge 40, secondary expansion wedge 50, expansion wing finish plate 60 ), The striking bar 70 is configured.

 As shown in FIGS. 7 and 11, the anchor body 10 has a plurality of strand wire insertion holes 11 formed at the top thereof in a vertical direction.

The stranded wire insertion hole 11 is formed while equally dividing the central axis while being spaced apart from the upper portion of the hollow portion to be described later outwardly.

7 is a line perpendicular to the cross section of the anchor body 10. In FIGS. 11 and 12, grooves are formed on both sides of the inner circumferential surface of each unit 10a constituting the anchor body 10. It is comprised so that it may form a hole shape in the state in which 10a was joined.

Such an arrangement can be achieved by merely forming a groove shape in the anchor body 10 without forming a separate hole, thereby facilitating member fabrication and manufacturing.

In addition, an inclined portion 12 is formed on the upper outer circumferential surface so that the outer diameter gradually increases toward the bottom.

A plurality of fastening ring insertion grooves 13 are formed on the outer circumferential surface of the lower portion of the inclined portion 12 and the fastening ring insertion grooves 13 are formed in the lower portion of the inclined portion 12. [ And a tightening ring 13a is wrapped around.

The tightening ring 13a may be composed of various members such as a rubber ring, a spring, and the like, which tightly surrounds the anchor body 10 and tightens toward the center.

In addition, the outer circumferential surface of the anchor body 10 may be formed in various surface shapes such as a pore, a groove, and an embossing in order to increase the grounding force.

The anchor body 10 is divided into a plurality of units 10a based on the central axis in the vertical direction as shown in FIG. 12, and the divided units 10a are generally cylindrical due to the fastening ring 13a being wrapped. It is made to take the form of.

On the other hand, the anchor body 10 has hollow hollow portions formed therein from the upper portion to the lower portion. The hollow portions are successively inserted from the upper side to the lower side in the order of the striking wedge insertion hole 14, the engagement jaw insertion hole 15, A guide hole 16 is formed.

The hitting wedge insertion hole 14, as shown in Figure 7 is formed with a locking jaw (14a) at the top.

In addition, the striking wedge insertion hole 14 may be formed so that the inner diameter gradually increases from the top downward, or the inner diameter gradually increases in the bottom section.

The oblique shape is intended to allow the striking wedge 20 to be slidably upwardly movable within the striking wedge insert hole 14 in accordance with the upward movement of the striking bar 70.

The latching jaw insertion hole 15 is formed spaced apart from the striking wedge insertion hole 14 as shown in the figure.

At this time, between the engaging jaw insertion hole 15 and the striking wedge insertion hole 14 is formed larger than the outer diameter of the striking bar 70 so that the striking bar 70 can be moved sufficiently, And has a diameter smaller than that of the insertion hole (15) while being connected to each other while being communicated with each other.

At this time, it is preferable that the bottom surface of the latching jaw insertion hole 15 is formed with a latching jaw guide portion 15a having a sectional shape inclined downward toward the center as shown in the drawing.

This is when the transition from Figure 3 to Figure 4, that is, when the striking head 71 touches the bottom of the expansion hole and the blow is made, the wing catching jaw 30 is the inclined catching jaw of the bottom of the catching jaw insertion hole 15 This is to allow each unit 10a of the anchor body 10 to unfold naturally while sliding along the guide part 15a.

The extended wedge guide hole 16 is formed with an inclined guide portion 16a which is directly connected to the engaging jaw insertion hole 15 and whose inclined inner diameter gradually decreases in the upward direction.

At this time, the lower inner peripheral surface of the inclined guide portion 16a is formed vertically.

The hitting wedge insertion hole 14, the locking jaw insertion hole 15, and the expansion wedge guide hole 16 are formed by dividing the anchor body 10 into a plurality of units 10a. A groove shape is taken on the inner wall surface of the unit 10a.

Strike wedge 20 is inserted into the hitting wedge insertion hole 14, as shown, the outer line is formed with a twisted wire guide groove 21 in a vertical direction to form a line with the strand insertion hole (11). .

In addition, a latching portion 22 is formed on the lower outer circumferential surface so as to protrude outward so as to be caught by the latching protrusion 14a.

The engagement portion 22 is engaged with the engagement protrusion 14a before each unit 10a of the anchor body 10 is extended. When the engagement protrusion 14a has an inner diameter larger than the outer diameter of the engagement portion 22 , The striking wedge 20 protrudes outside the striking wedge insertion hole 14 and becomes movable.

The hitting wedge 20 has a hitting bar fastening groove 23 is formed at the bottom as shown, it can be connected to the top of the hitting bar 70 is screwed.

As shown in FIGS. 7 and 10, the wing catching jaw 30 is inserted into the catching jaw insertion hole 15 and the line connecting hole 31 is vertical to form a straight line with the strand inserting hole 11. It is formed in the direction, the first strike bar through-hole 32 through which the middle of the striking bar 70 penetrates is formed in the center.

The wing hook 30 is slidably moved up and down by the hitting bar 70 through the first hitting bar penetration hole 32 and the hitting bar 70 through the hitting bar 30.

In addition, the strand 1 passes through the perforated strand through hole 31 so that it can move up and down along the strand 1.

Normally the wing catching jaw 30 is inserted into the catching jaw insertion hole 15 as shown in Figure 3 is not movable up and down, but each unit 10a of the anchor body 10 is expanding or expanding In one state, the sliding jaw guide portion 15a may be slid and moved, or may be pushed by the primary expansion wedge 40 and moved to the impact wedge insertion hole 14 as shown in FIG. 6.

The primary expansion wedge 40 is inserted into the expansion wedge guide hole 16 in the anchor body 10, as shown in Figure 7, 8 and 10.

The first widening wedge 40 has an upper inclined portion 41 having an inclination angle equal to that of the inclined guide portion 16a. The first widening wedge 40 has an upper inclined portion 41, So that it can move along the inclined guide portion 16a.

In addition, a vertical portion 42 formed vertically is formed in the lower portion of the upper inclined portion 41.

In the center of the first widening wedge 40, a second bar 43 is vertically formed so that the bar 70 is connected.

In addition, a stranded wire fastening hole 44 is formed to connect the lower portion of the stranded wire 1 installed through the stranded wire insertion hole 11, the stranded wire guide groove 21, and the stranded wire through hole 31.

At this time, the strand fastening hole 44 has a lower diameter is large, as shown in the upper portion is formed to be small step between the stepped, and the lower strand (1) to the shape corresponding to this by the upper line on the strand (1). When the tensile force is applied in the direction, the primary extension wedge 40 is subjected to a force to move upward together with the strand 1.

The second expansion wedge 50 has a third strike bar through-hole 51 formed in a line with the second strike bar through-hole 43 in the center is formed so that the striking bar 70 penetrates, the entire or peripheral surface A part of which the first inclined surface 52 is inclined of the lower light cooperating side is formed, and an upper portion thereof is connected to the first expansion wedge 40.

The method of connecting with the primary expansion wedge 40 is to increase the inner diameter of the lower portion of the second strike bar through hole 43 of the primary expansion wedge 40 and then form a thread therein, the secondary expansion wedge 50 By forming a screw thread on the upper outer peripheral surface of the screw thread, the secondary expansion wedge 50 may be connected to the primary expansion wedge 40 by screwing.

As shown in FIGS. 7, 11 and 12, the extension blade finishing plate 60 is divided into a plurality of pieces based on the central axis in the vertical direction and fastened to the lower end of each unit 10a of the anchor body 10.

As shown in the figure, the first bolt fastening hole 17 is formed in the lower portion of the anchor body 10, and the extension wing finishing plate 60 And a second bolt fastening hole 62 which is in line with the first bolt fastening hole 17 is formed and the fastening bolt 62a is connected through the two holes.

The plurality of extended wing finishing boards 60 are fixed to the respective anchors 10 and at the center thereof are formed widened wedge insertion holes 61 which are in line with the third striking bar through holes 51.

The extended wedge insertion hole 61 is formed with a second inclined face 61a having a lower inclination angle equal to that of the first inclined face 52 of the secondary wedge 50.

The second inclined surface 61a is formed in the expansion wedge insertion hole 61 so that the expansion blade closing plate 60 smoothly opens when the second expansion wedge 50 is inserted through the expansion wedge insertion hole 61. In addition, the secondary expansion wedge 50 is to be smoothly inserted to rise.

Strike bar 70, as shown in the upper portion is connected to the striking wedge 20, the lower portion is projected to the outside of the third strike bar through hole 51 of the secondary expansion wedge 50 at the bottom The striking head 71 is connected.

The striking head 71 has a striking bar fastening hole 71a into which the bottom of the striking bar 70 is inserted, as shown, so that the bottom of the striking bar 70 is inserted into the striking bar fastening hole 71a and thus the striking bar ( 70) A screw thread may be formed on the lower outer circumferential surface and the inner circumferential surface of the striking bar fastening hole 71a to be screwed and fixed.

Meanwhile, as illustrated in FIGS. 7 and 8, between the lower end of the primary expansion wedge 40 and the extension blade finishing plate 60, a first line forming a line with the second striking bar through-hole 43 in the center is formed. Four strike bar through-hole 81 is formed, and the buffer plate 80 made of an elastic material; An enlarged wedge finish plate 90 provided at a lower portion of the buffer plate 80 and having a fifth bar bar through hole 91 formed at the center thereof and aligned with the fourth bar bar through hole 81, It is desirable to install.

The buffer plate 80 minimizes the impact generated when the striking head 71 hits the hole of the hole and is transmitted to the anchor body 10 and the extended blade finishing plate 60, .

Looking at the drawings it can be seen that the hole for fastening the bolt is shown in the buffer plate 80 and the expansion wedge finishing plate 90, after forming a hole forming a line with the hole on the bottom of the primary expansion wedge 40 The buffer plate fastening bolt 92 may be fixedly installed.

The multi-expansion permanent anchor configured as described above is characterized in that the upper and lower portions can be opened at the same distance from the center when the anchor body 10 is opened.

This is because the upper striking wedge 20, the intermediate first widening wedge 40 and the lower second widening wedge 50, which are connected to the striking bar 70, , The middle, and the bottom, respectively.

When the anchor body 10 is opened at equal intervals, the outer peripheral surface of the anchor body 10 is uniformly contacted with the inner wall surface of the hole, thereby achieving an equal supporting force and improving the supporting force.

In addition, such an equal force can be exerted even when the anchor body 10 is extended several times.

To this end, as shown in FIG. 8, the length (a) of the first inclined surface 52 of the secondary extension wedge 50 protruding downward from the extension blade closing plate 60 is the primary extension wedge 40. It is formed equal to or longer than the distance (b) from the upper end to the upper end of the inclined guide portion 16a of the anchor body 10, the inclination angle of the first inclined surface 52 is the inclination angle of the inclined guide portion 16a It is desirable to have an inclination angle of ± 1 ° relative.

This is, when the primary expansion wedge 40 and the secondary expansion wedge 50 that are connected together ascends, as shown in Figure 5 the upper inclined portion 41 of the primary expansion wedge 40 when the secondary expansion In contact with the inclined guide portion 16a of the anchor body 10, at this time, the first inclined surface 52 of the secondary expansion wedge 50 is supported on the second inclined surface 61a of the extension finish blade 60. The expansion is made in an even state up and down.

Alternatively, as shown in FIG. 9, the expansion wedge insertion hole 61 of the extension blade closing plate 60 and the first inclined surface 52 of the secondary expansion wedge 50 are engaged with each other. The 63 and the protrusion 52a may be formed along the longitudinal direction so that the upper and lower portions of the anchor body 10 may be evenly extended.

At this time, the inner wall surface of the anchor body 10 and the outer peripheral surface of the first expansion wedge 40 may also form grooves and projections.

3. First Expansion Stage

The impact bar 70 of the lower permanent anchor hits the bottom of the expansion hole 4 so that the wedge moves into the anchor body 10 to first expand the anchor body 10.

More specifically, when the permanent anchor is inserted downward in the state of FIG. 3, the inside of the hole slides downward, and the impact head 71 collides with the bottom surface of the expansion hole 4.

At this time, as shown in Figure 4, the outer anchor body 10 is in a state of continuing to descend, on the contrary, the first inclined surface 52 of the secondary expansion wedge 50 of the lower anchor body 10 is extended wing The second wedge surface 61a of the inner peripheral surface of the expansion wedge insertion hole 61 of the closing plate 60 is moved upward based on the anchor body 10, and the first expansion wedge 40 connected thereto is also upper side. The upper inclined portion 41 is raised while in contact with the inclined guide portion 16a of the anchor body (10).

In this state, the anchor body 10 has a first widening wedge 40 rising on the inclined guide portion 16a and a second widening wedge 40 rising on the second inclined face 61a of the lower extension wing finishing plate 60, The wedge 50 expands horizontally while maintaining a vertical gap.

At this time, the impact wedge 20 connected to the upper portion of the impact bar 70 is moved upward relative to the anchor body 10 to move to the upper portion of the impact wedge insertion hole 14, 22).

The diameter of the hole 4 is larger than the outer diameter of the anchor body 10 which is first expanded. However, the diameter of the hole 4 may be larger than the outer diameter of the anchor body 10 The anchor body 10 may be brought into close contact with the hole 4 only by the primary expansion.

In this primary expansion, the anchor anchor 10 is opened while the permanent anchor of the present invention is lifted by the impact wedge 20 with only a small impact due to its own weight. In this state, the primary expansion wedge 40 and the secondary expansion are expanded. The wedge 50 becomes a position that rides the inclined wall surface inside the hollow part of the anchor body 10, and thus can be easily expanded during the tensioning action of the strand 1 that proceeds.

4. Second Expansion Stage

The tension wire 1 is first tensioned to raise the wedge to move the anchor body 10 in the vertical direction while horizontally expanding the anchor body 10 secondly so that the side wall of the anchor body 10 is expanded into the wall of the expansion hole 4. The inclined portion 12 of the anchor body 10 to the shoulder portion 3.

More specifically, when the tensile wire (1) discharged to the outside of the drilling hole (2) using a tensioner as shown in Figure 5, the lower end of the wire (1) is connected to the primary expansion wedge 40, 1 The secondary expansion wedge 40, the secondary expansion wedge 50 is pulled upwards.

The first widening wedge 40 rides on the inclined guide portion 16a and comes into contact with the bottom surface of the winging jaw 30 provided inside the engaging jaw insertion hole 15. Then, And the wing catching jaw 30 moves the anchor body 10 upward while the upper end of the wing catching jaw 30 is caught by the upper end of the catching jaw insertion hole 15. [

That is, in the second expansion, as in the first expansion, the primary expansion wedge 40 and the secondary expansion wedge 50 are in contact with the anchor body 10 and the extension blade finishing plate 60, respectively, and the anchor body 10 To expand uniformly up and down, and then push the primary expansion wedge 40 and the wing catching jaw 30 to move the anchor body 10 upward so that the inclined portion 12 of the anchor body 10 expands the hole 4. Will be in close contact with the shoulder (2).

5. 3rd Expansion Stage

By tensioning the strand 1 secondly and further raising the wedge, the anchor body 10 is horizontally expanded in the third direction so that the side wall surface and the inclined portion 12 of the anchor body 10 are enlarged holes 4 and shoulders ( 3) to dig into the horizontal direction or to be in close contact with the expansion hole (4) and the shoulder (3) in the horizontal direction.

More specifically, when the tension line 1 is further tensioned as shown in FIG. 6, the upper portion of the first extension wedge 40 passes through the locking jaw insertion hole 15 to reach the lower portion of the impact wedge insertion hole 14. At this time, the wing catching jaw 30 inserted in the catching jaw insertion hole 15 is in a state where the upper end is not caught by the catching jaw inserting hole 15 by the expansion of the anchor body 10, and hitting the wedge inserting hole 14. It is settled in.

That is, in the third expansion, the upper portion of the first widening wedge 40 is introduced into the insertion jaw insertion hole 15, and the vertical portion 42 of the lower portion of the upper inclined portion 41 is brought into contact with the lower end edge of the jaw insertion hole 15 So that the anchor body 10 extends horizontally.

At this time, the horizontally extending anchor body 10 applies pressure in the horizontal direction to the wall surface and the shoulder portion 3 of the hole 4, and in the case of weathered rock or soft rock fragment, The anchor body 10 is pushed into the inside of the hole 3, so that a firm anchor force can be exerted also on the weak hole 4.

In FIG. 6, the first horizontal displacement 5 generated on the inner wall surface of the expansion hole 4 is indicated by a dotted line as the anchor body 10 penetrates in the horizontal direction, and the anchor is positioned on the upper portion of the first horizontal displacement 5. The second horizontal displacement 5a generated by the inclined portion 12 of the sieve 10 penetrating into the shoulder portion 3 in the horizontal direction is shown by a dotted line.

As the second horizontal displacement 5a is generated as described above, the upper end 18 of the anchor body 10 can exhibit a strong supporting force along the inside of the shoulder portion 3.

At this time, it is preferable that the diameter of the wing catching jaw 30 is formed to be larger than the outer diameter of the first extension wedge 40, and the wing catching jaw 30 is caught on the lower end of the extended strand wire insertion hole (11).

6. Grouting Step

After completion of the tension as described above, the grout solution is injected into the drilling hole 2 to cure.

At this time, the strand 1 is maintained in a taut state through tension, so that even after curing of the grout liquid is not uniform or breakage occurs.

When grouting is performed, the anchor body 10 contacts the wall of the expansion hole 4 evenly up and down, and is firmly pressed against the wall of the expansion hole 4 so that the frictional resistance of the anchor body 10 and the expansion hole ( The acupressure of 4) can be exerted greatly, and it is added to the peripheral frictional resistance by the grout, thereby greatly improving the anchor bearing capacity.

7. Deadline

Finish the cap by installing the cap on the upper part of the drilling hole (2).

An example of a finishing step is to fill the head with grease after the grout has finished and install a separate cap to finish the head.

This finishing step may be applied to a variety of known finishing methods.

Multi-expansion permanent anchor construction method of the present invention configured as described above is capable of horizontal expansion in multiple, the first horizontal by hitting the expansion hole (4) of the impact wedge 20 using a permanent anchor that can be vertically moved in the middle Expansion, and the anchor body 10 is firmly adhered to the wall surface and the shoulder portion 3 of the expansion hole 4 by the second horizontal expansion and the vertical movement according to the tension of the strand. As the third expansion is made, the rock foundation has a strong adhesion, and in the soft ground such as the crushed ground, the anchor body 10 penetrates into the expansion hole 4 wall surface so that it can exert sufficiently strong support even in the soft ground.

1: Strand 2: Perforated hole
3: Shoulder part 4: Expansion hole
5: first horizontal displacement 5a: second horizontal displacement
10: anchor body 10a: unit
11: Strand insertion hole 12:
13: tightening ring insertion groove 13a: tightening ring
14: striking wedge insertion hole 14a:
15: engaging jaw insertion hole 15a: engaging jaw guide portion
16: extended wedge guide hole 16a: inclined guide portion
17: first bolt fastening hole 18: upper
20: striking wedge 21: strand guide groove
22: fastening part 23: fastening bar fastening groove
30: wing hook jaw 31: stranded wire penetration hole
32: first striking bar penetration hole 40: first expansion wedge
41: upper inclined portion 42: vertical portion
43: second striking bar through hole 44: stranded fastening hole
50: second expansion wedge 51: third hitting bar penetration hole
52: first inclined surface 52a:
60: extension wing finishing plate 61: extended wedge insertion hole
61a: second inclined surface 62: second bolt fastening hole
62a: fastening bolt 63: groove
70: Striking bar 71: Striking head
71a: fastening bar fastening hole 80: buffer plate
81: Fourth impact bar penetration hole 90: Extended wedge finish plate
91: Fifth batting bar through-hole 92: buffer plate fastening bolt

Claims (3)

In the permanent anchor construction method,
Forming a shoulder portion 3 having a diameter gradually increasing in the lower portion of the drilling hole 2 and an expansion hole 4 having a constant inner diameter in the lower portion of the shoulder portion 3 while drilling the target ground using the expansion bit; Expansion hole forming step;
A multi-expansion in the horizontal direction, the anchor body 10 is formed with an inclined portion 12 inclined at the top, the striking bar 70 is provided below the anchor body 10, and the striking bar 70 And expands the anchor body 10 while moving inside the anchor body 10, and prepares a multi-expansion permanent anchor including a wedge to which the strand 1 is connected to the drill hole 2. An anchor insertion step of inserting into the interior;
A first expansion step of firstly expanding the anchor body 10 while the wedge is moved into the anchor body 10 by hitting the impact bar 70 below the permanent anchor at the bottom of the expansion hole 4;
The strands 1 connected to the wedges are first tensioned to raise the wedges so that the anchor body 10 is horizontally expanded in the second direction and the anchor body 10 is moved in the vertical direction so that the side wall surface of the anchor body 10 is A second expansion step of bringing the inclined portion 12 of the anchor body 10 into close contact with the shoulder portion 3 so as to be brought into close contact with the wall of the expansion hole 4;
By tensioning the strand 1 secondly and further raising the wedge, the anchor body 10 is horizontally expanded in the third direction so that the side wall surface and the inclined portion 12 of the anchor body 10 are enlarged holes 4 and shoulders ( 3) the third expansion step to dig into the horizontal direction or to be in close contact with the expansion hole (4) and the shoulder (3) in the horizontal direction;
Grouting step of curing by injecting grout liquid into the hole (2);
Comprising, comprising; a finishing step of finishing the process by installing a cap on the upper hole (2)
Construction method of multiple extension permanent anchor.
The method of claim 1,
The multiple expansion permanent anchor,
A plurality of stranded wire insertion holes 11 are vertically formed on the upper end and an inclined portion 12 inclined so that the outer diameter gradually increases is formed on the upper outer circumferential surface. And a tightening ring insertion groove 13 is formed to surround the fastening ring 13a and a hollow portion is formed from the upper portion to the lower portion inside the fastening ring 13a. The hollow portion is provided with a locking jaw 14a A striking jaw insertion hole 15 formed to be spaced apart from the striking wedge insertion hole 14 and an inclined guide portion 16a which is inclined so that the inner diameter gradually decreases in the upward direction, The lower inner peripheral surface of the inclined guide portion 16a is formed of an extended wedge guide hole 16 formed perpendicular to the anchor body 16a. The anchor body 16a is divided into a plurality of units 10a, 10);
A strand guide groove 21 is formed in a vertical direction on the outer circumferential surface so as to be in line with the strand insertion hole 11 and the engagement protrusion 14a is formed on a lower outer circumferential surface, A striking wedge (20) formed with an engaging portion (22) protruding outward so as to be engaged with the striking wedge (20);
Hole 31 is formed in a vertical direction so as to be in line with the strand insertion hole 11 and a first impact bar penetration hole 32 is formed at the center of the strut penetration hole 31, A wing-clipping jaw 30 formed with a wing;
And an upper inclined portion 41 having an inclination angle equal to that of the inclined guide portion 16a is formed on the upper side of the upper wedge guide hole 16, A second vertical bar penetrating hole 43 is vertically formed at the center of the vertical bar 42 and the vertical bar 42 is vertically formed in the center of the vertical bar 42. The strand insertion hole 11, A primary expansion wedge 40 formed with a strand connecting hole 44 to which a lower portion of the strand 1 installed through the through hole 31 is connected;
And a third striking bar through hole 51 is formed at the center of the third striking bar through hole 43 in a straight line with the second striking bar penetrating hole 43. A first inclined surface 52 inclined downward or inclined is formed on the whole or a part of the outer circumferential surface A second expansion wedge (50) having an upper portion connected to the primary wedge (40);
And is connected to the lower end of each unit 10a of the anchor body 10 and has an enlarged wedge insertion hole (not shown) formed at the center thereof in a straight line with the third hitting bar through- 61 is formed on the upper wedge insertion hole and the extended wedge insertion hole has an extended wing finishing plate 60 having a lower inclined face 61a formed to have the same inclination angle as the first inclined face 52 of the secondary wedge, and;
An upper part is connected to the striking wedge 20, and a lower part of the second striking bar 50 has a striking head 71 connected to a lower end while protruding outside the third striking bar through hole 51. Bar 70; characterized in that comprises a,
Construction method of multiple extension permanent anchor.
3. The method of claim 2,
In the first expansion step, the first inclined surface 52 of the second expansion wedge 50 connected to the striking bar 70 is extended by striking the striking bar 70 under the permanent anchor at the bottom of the expansion hole 4. An upper slope portion of the primary expansion wedge 40 connected to the secondary expansion wedge 50 so as to move upward through the second inclined surface 61 a of the inner peripheral surface of the expansion wedge insertion hole 61 of the wing closing plate 60 ( 41 is raised so as to be in contact with the inclined guide portion 16a of the anchor body 10 so that the anchor body 10 is first expanded horizontally while maintaining an equal interval up and down, but is connected to the upper part of the striking bar 70. The impact wedge 20 is made to move up until the catching portion 22 is caught on the catching jaw 14a,
In the second expansion step, the first extension wedge 40 and the second extension wedge 50 are pulled upward by tensioning the strand 1 to the primary and the primary extension wedge 40 is inclined guide portion 16a. Ascending the ride while extending the anchor body 10 horizontally, the wing catching jaw (30) by pushing the wing catching jaw 30, the upper end of the catching jaw insertion hole (15) while holding the anchor body (10) By moving upward the side wall surface of the anchor body 10 is in close contact with the wall of the expansion hole (4), the inclined portion 12 is made to be in close contact with the shoulder (3),
The third extension step is to stretch the strand (1) in the secondary to pull the primary expansion wedge 40, the secondary expansion wedge 50 upwards, the primary expansion wedge 40 is the wing catching jaw (30) While pushing the wing catching jaw 30 to the upper part of the locking jaw insertion hole 15, the vertical portion 42 of the lower portion of the first extension wedge 40 contacts the lower edge of the locking jaw insertion hole 15. The third sidewall and the inclined portion 12 of the anchor body 10 are horizontally expanded into the expansion hole 4 and the shoulder portion 3 so as to be horizontally expanded to the third direction, or the expansion hole 4 and the shoulder portion ( 3) characterized in that the contact made in the horizontal direction,
Construction method of multiple extension permanent anchor.

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