KR101158417B1 - A compressed and dispersed composite anchor removable the tension member and constructing method the same - Google Patents

Abstract

The present invention is to secure the permanent anchoring force by providing a permanent tension anchor fixed permanent anchor anchor by providing a permanent configuration fixed anchor anchor in the anchorage section and the removable load-distributing anchor located in the free cage to be separated and combined The present invention relates to a tensile dispersion type composite anchor body capable of easily removing an anchor of a free book and removing a tension member that can adjust an allowable anchoring force according to the ground conditions of different sites, and a construction method thereof.

The present invention, the tension member is introduced into the free long section to provide a tension force; An anchor fixing body having a wedge assembly mounted therein for holding a tip of a tension member therein; Connection mediation means for mounting the anchor fixture on one side; A grip sleeve coupled to the other side of the connection medium; And it is inserted into the grip sleeve is fixed, and provides a tension-dispersion type composite anchor body capable of removing the tension material including a permanent anchor to exert an allowable anchor force in the anchorage section.

Anchor anchor, free field, anchorage, tension member, permanent anchor, composite anchor

Description

A compressed and dispersed composite anchor removable the tension member and constructing method the same}

The present invention relates to a composite ground anchor body and a construction method thereof, and more particularly, to a permanent anchor anchor and a removable tension-distributing anchor by separable combination to secure a permanent anchoring force in the anchorage section, The present invention relates to a tensile-dispersion type composite anchor body capable of easily removing a tension member located therein and a construction method thereof.

In general, ground anchors are used to stabilize structures from excessive stresses, deformations, and displacements in the ground by fixing high-strength tension members, such as PC strands, on both sides of the structure and the ground and applying prestress in civil works. It is a construction material.

The ground anchor body may be classified into a tension anchor, a compression anchor, and a load distribution anchor that distributes loads in the tension anchor and the compression anchor according to the supporting method of the mounting ground.

The tensile anchoring method is a method of supporting the ground by the friction force between the ground and the grout by providing a tension to the tension member after inserting the tension member into the perforated ground and filling the grout, as shown in Figures 1a and 1b. The tensile anchoring method has a disadvantage in that the load reduction is large because progressive fracture occurs due to cracks due to tension applied to the tension member 104 and creep due to load concentration in the grout 102. have. Therefore, as shown in the main surface friction distribution graph shown in FIG. 1B, initially, the load transfer distribution is shown as curve 1 (initial loading), but as time passes, curve 3 ( ultimate loading) and the load decreases. In addition, when the tensile force is applied to the grout 104, the expected load curve is expected in the design, but in practice, the load concentration section is greater than the ultimate pull force of the target ground, so it eventually relaxes in the shape of the load curve 2 and the shape of the load curve 3 Is settled. The main reason for this occurrence is the decrease in local friction due to concentration of load.

2A and 2B, the compression type anchoring method is a method of generating a compressive force on the grout by confining a polyethylene (PE) -coated P.C strand in a separate fixture. When the compression type anchoring method imparts tension to the fixture 106 through the tension member 104, the fixture 106 compresses the grout 102 so that it is more likely to creep than the tension anchor method. Due to the small load reduction, it is necessary to use a high-strength grout has a disadvantage that can not secure a predetermined anchor force in a relatively soft ground. In addition, the compressive force acting on the grout 102 causes load concentration to occur at the distal end, as shown in the load change diagram of FIG. 2A, and such load concentration can destroy the grout and introduce a load exceeding the ultimate frictional force. There is a disadvantage in that it must be settled in the rock with high perforation diameter or high peripheral restraint pressure. As in the case of the tension type anchor, the compression type anchorage causes a load reduction (the load variation of the load in Fig. 2a ①-②-③) and further causes a sudden load reduction due to compression failure. As can be seen from the main surface friction distribution graph of FIG. 2B, in the case of the load-focused anchor, the load transfer distribution changes from the load curve 1 to the load curve 3, thereby reducing the load.

The load-distributing anchor method compensates for the shortcomings of the tension-type anchoring method and the load-focusing anchoring method as shown in FIGS. 3A and 3B, and is a method loaded by dispersing the tension-type anchor in various parts. In this load-distributing anchoring method, extreme load concentration should not occur in the anchoring ground and grout 102, and PE coated PC strands without restraint of free portion should be used. It should be easy to apply. In the case of the load-dispersed tensile anchor, the load is distributed and loaded in various parts of the tension member 104, so that the anchor force is less affected by the grout strength and the predetermined anchor force can be secured even in relatively soft soils. Can exert.

As shown in the load distribution diagram and the principal friction distribution graph shown in Figs. 3a and 3b, the load distribution anchor is applied to the ground by distributing the load so that the load reduction is extremely small and the initial load distribution is maintained regardless of time.

The anchor support of the above-mentioned load-distributing concept has been proposed as "friction and tensile force distributed composite ground anchor" in Utility Model Registration No. 0475568 filed and registered by the present applicant. That is, the complex ground anchors are arranged such that anchors (a, b, c) located in the anchorage section form a stepped step as shown in FIG. 4, and tension members 221a, 221b, and 221c located in the free ledger after completion of construction. By removing the from the internal fixing body 220 secured a large anchoring force compared to the tension-type anchor or compression-type anchor constructed by arranging the existing in one line.

Reference numeral 222 denotes a spacer.

In the composite ground anchor structure described above, as shown in FIG. 5, the cap 225 is screwed to the body of the internal fixing body 220, and the anchor a fixed to the compression sleeve 231 is the cap 225. It consists of a structure connected through.

In the structure, when the tensile force is applied to the anchor (a) in the tensioning and fixing process, the cap 225 may be detached from the body of the internal fixing body 220 by the tensile force. Since the anchor is fixed to the internal fixing body 220, it is difficult to adjust the allowable anchor force depending on the ground conditions of different sites. Also, the internal fixing body 220 is mounted. Since the inner body structure is packed and shipped in the form of a circular bundle during production, it is difficult to produce the anchor (a) and the anchoring body 220 which are not substantially coated, and thus have difficulty in carrying. Doing.

Therefore, the present invention has been proposed to solve the above problems, the permanent fixed anchor positioned in the anchorage section and the removable anchor positioned in the free chapter is composed of a complex configuration that can be separated and combined in a permanent fixed anchor It is an object of the present invention to provide a tensile dispersion type composite anchor body capable of securing a permanent anchoring force by applying necessary tensioning force, and removing a tensile material that can easily remove the anchor of a free chapter and a construction method thereof.

In addition, the present invention can be produced by packing and removing only the removable load-distributing anchor can be separated from the permanently fixed anchor removable load-distributing anchor, it is possible to adjust the allowable anchoring force according to the ground conditions of different sites Another object of the present invention is to provide a tensile-dispersion type composite anchor body capable of removing a tensile material and a construction method thereof.

In order to achieve the above object, the present invention, the tension member is introduced into the free long section to provide a tension force; An anchor fixing body having a wedge assembly mounted therein for holding a tip of a tension member therein; Connection mediation means for mounting the anchor fixture on one side; A grip sleeve coupled to the other side of the connection medium; And it is inserted into the grip sleeve is fixed, and provides a tension-dispersion type composite anchor body capable of removing the tension material including a permanent anchor to exert an allowable anchor force in the anchorage section.

In addition, the present invention comprises a first step of forming a composite anchor body by clamping the front end of the tension member to the wedge assembly of the anchor fixing body, and screwing the grip sleeve of the block body and the permanent anchor of the anchor fixing body on both sides of the coupler; Block spacers are inserted into the outer surface of each coupler of the at least two compound anchors, a tension member of the compound anchors adjacent to the groove of the block spacer is inserted, and permanent anchors of the compound anchors are arranged in a stepped manner to anchor holes. Inserting a second step; A third step of fixing the grout material by filling the anchor hole and fixing the grout material to an external fixing body installed on a slope in a state in which a tensile force is applied to the tension member; After completion of the anchor construction, the fourth step of releasing the tensile force by cutting the tension member fixed by the external fixing body with a welding machine or the like; A fifth step of releasing the wedge bite force of the tension member by pushing the wedge assembly holding the tension material by the reaction force as a reaction force having a magnitude corresponding to the tension force is applied to the tension member; And it provides a method of constructing a tensile-dispersion-type composite anchor body capable of removing the tension material comprising a sixth step of drawing out and removing the tension material from the anchor fixing body.

As described above, according to the present invention, the following effects are obtained.

First, a coupler is mounted on an anchor fixing body equipped with a tension member, and a complex anchor is combined with a permanent anchor screwed to the coupler in a drilled hole, and the tensile force is applied to the free anchor, thereby compressing between the anchor fixing body and the grout. By inducing dispersion and increasing the frictional force between the ground and the grout in the fusing unit, it is possible to secure an excellent anchoring force than the existing tensile anchors or load-intensive anchors.

Secondly, a combination of at least two anchor anchors in which a tension member is mounted and at least two compound anchors combining permanent anchors on both sides of the coupler, and the tensile load in the anchorage section by arranging the permanent anchors of these complex anchor bodies stepwise in the anchorage section. Dispersing effect. Accordingly, the creep phenomenon due to the load can be minimized, and thus, the ground stability can be reliably maximized by maximizing the bearing capacity in the soft ground as well as the general ground.

Third, since the permanent anchor can be separated from the composite anchor body, only the anchor fixing body equipped with the tension member can be packed and produced, and the permanent anchor can be assembled to the anchor fixing body in the field, thereby making construction simple.

Fourth, it is possible to adjust the allowable anchoring force in accordance with the ground conditions of different sites by the tensile force is applied to the anchor anchoring screw sleeve of the permanent anchor screwed.

Hereinafter, with reference to the accompanying Figures 6 to 11 will be described an embodiment of the present invention;

Tensile dispersion type composite anchor body that can remove the tension material according to the present invention and its construction method is a composite configuration in which the permanent anchor positioned in the anchorage section and the anchor fixing body equipped with the tension member located in the free long section can be separated and combined By maximizing the support in not only the general ground, but especially the soft ground, the ground can be reliably implemented.

Figure 6 is a partial cross-sectional view showing the configuration of a first embodiment of the tension-dispersion type composite anchor body capable of removing the tension material according to the present invention, Figure 7 shows a state in which the anchor support and the permanent anchor is assembled to the coupler which is the main part of the present invention; 8A and 8B are cross-sectional views illustrating a manufacturing process in which a grip sleeve is compressed to a permanent anchor which is a main part of the present invention.

As shown in the figure, the tension member (2) is introduced into the free long section to provide a tension force; The wedge assembly 6 for holding the front end of the tension member 2 to introduce a tensile force and to remove the tension member 2 when the tension force is released, and the block body 7 for supporting the wedge assembly 6 therein. An anchor fixture 4 comprising; A coupler (8) for one side detachably coupled to the block body (7) of the anchor anchor (4); A grip sleeve 10 detachably coupled to the other side of the coupler 8; A permanent anchor 12 having a twisted shape of several strands of PC strands and fitted into the grip sleeve 10 to exert an allowable anchoring force in the anchorage section; A block spacer 14 fitted to the outer circumferential surface of the coupler 8 and having a plurality of grooves 14a formed therein for holding the tension member 2 at the periphery thereof; And an anchor body 16 installed at one end of the anchor fixing body 4 to prevent reinforcement of the tension member 2, waterproofing, and detachment of the steel wire.

In addition, the present invention is inserted into the outer circumferential surface of the permanent anchor 12, the strand grip 18 for increasing the binding with the grout put in the anchorage to secure the allowable tensile force according to the increase in friction force; It further includes a support cone 20 fitted to the tip of the permanent anchor 12 in order to prevent the PC strand strand forming the permanent anchor 12 is dismantled.

In the above configuration, the tension member 2 has a structure in which the PC strand 2a made by twisting several strands is covered with a PE tube 2b. In addition, the anchor fixing agent 4 having a structure in which the tension member 2 and the wedge assembly 6 are mounted inside the block body 7 has a bat type patent filed and registered by the present applicant. Patent No. 43,070, Utility Model Registration No. 0242474, Swing Type Patent No. 0411567, Patent No. 0435069, etc. may be employed, and the detailed description of the main configuration herein is provided. Omit.

However, the block body 7 of the anchor fixing body 4 has a structure in which a female thread groove 7a for fastening with the coupler 8 is formed at a distal end thereof from the prior patent structure.

In the embodiment of the present invention, the strand grip 16 shows an example formed of a cylindrical rounded concave portion, but is not limited to this, and may be any shape that can increase the binding force with the grout. For example, it is well known that the strand grip 16 may take the form of a polygonal block such as a trapezoidal shape, a square, or a circular disk plate.

As shown in FIG. 7, the coupler 8 has a blocking film formed at an inner center thereof, and a stepped groove is formed at both sides of the barrier film, and the one stepped groove has a female screw 8a formed therein. It is composed of blocks. In particular, the coupler 8 has a male screw 8b formed on the other outer surface thereof and is fastened to the female screw groove 7a formed in the block body 7 of the anchor fixing body 4.

The grip sleeve 10 processes the external thread 10a on the outer circumferential surface to be fastened to the female thread groove 8a of the coupler 8 without shrinking the cross section so that only the fastening force is sufficient to bear the tension applied to the permanent anchor 12. To make it possible. Due to the separation structure of the anchor fixture 4 and the permanent anchor 12, the anchor fixture 4 can be produced together with the tension member 2 in a factory-packed packaging, as well as being easy to transport. In the field, by anchoring the anchor fixture 4 and the permanent anchor 12 via the coupler 8, the site anchor construction can be performed simply.

As shown in FIG. 8, the permanent anchor 12 fitted to the grip sleeve 10 is crimped and fixed by a drawing process. At this time, the insert plate 22 for increasing the fixing force of the permanent anchor 12 is attached to the inner surface of the grip sleeve 10 is drawn through a die (not shown) as shown in the right figure of FIG. As the diameter of the grip sleeve 10 is reduced, the insert plate 22 and the permanent anchor 12 are compressed and integrated.

The composite anchor body 30 constructed and assembled as described above is inserted into the anchor hole to exert a tensile force together with the grout body.

Next, the construction example of the composite anchor body 30 which concerns on this invention is demonstrated with reference to FIGS.

FIG. 9 is a view illustrating a construction example of a tensile-dispersion composite anchor body capable of removing a tension member according to the present invention, FIG. 10 is a cross-sectional view taken along line a-a 'of FIG. 9, and FIG. 11 is a cross-sectional view taken along line b-b' of FIG.

In this application example, the anchor fixing agent 4 is an example in which the swing fixing type of the inner fixing body for pulling material removal type ground anchor of Patent No. 0435069.

In the construction example of the present invention, which is mainly applied to soft ground as well as general ground, to be performed for slope stability or earth wall stability, the portion of the wedge assembly 6 of the anchor anchoring body 4 removed from the tension member 2 in the wedge assembly 6 Coupler corresponding to each of the external thread 10a of the grip sleeve 10 in which the permanent anchor 12 is crimped and the female thread groove 7a of the block body 7 of the anchor fixing body 4 in the state where the tip is bitten ( 8) Combining the female thread groove (8a) and the male screw (8b) formed on both sides to form a composite anchor body (30), it is inserted into the anchor hole 32 in the ground. Then, the anchor hole 32 is filled with the grout material 34 to be fixed, and then fixed with an external fixing body 38 installed on the slope 36 in a state in which tension is applied to the PC strand 2a of the tension material 2. Perform a series of processes.

In this construction, since the screwing force between the coupler 8 and the grip sleeve 10 is secured larger than the tensile force applied to the permanent anchor 12 of the anchorage, there is no fear of detachment of the permanent anchor 12.

When the anchor construction is completed, the tension member (2) is a compressive dispersion action on the grout body in the free field section, the permanent anchor 12 in the anchorage site gives a tensile force to the grout body friction force between the ground and the grout body Increase the load on the ground.

In this construction example, as shown in Fig. 9, three composite anchor bodies 30a, 30b, and 30c are arranged in the anchor hole 32 so that the tensile dispersion effect and the bonded length in the free length section are bonded. length) shows an example of maximizing the tensile force in the section. In particular, the present invention shows an example in which the permanent anchors 12 of each of the three composite anchor bodies 30a, 30b, and 30c are arranged in a staircase shape with respect to the total length of the anchorage section. However, the present invention is not limited to this example, and it is well known that the composite anchor body 30 can be installed in a range that the block spacer 14 can accommodate according to the ground conditions (depending on the soft ground or the general ground state). Is true. Typically, since the block spacer 14 is formed with eight grooves into which the tension member can be inserted, the composite anchor body 30 may have two to eight (or nine) arrangements. In addition, it is well-known that when the hole diameter is considerable and a plurality of strands of anchors are required, more grooves of the block spacer 14 can be made.

As shown in FIG. 10, the stepped arrangement of the composite anchor bodies 30a, 30b, 30c is characterized by the combination of the composite anchor bodies 30a, 30b, 30c adjacent to each groove of the block spacer 14 fitted in the coupler 8. The tension member 2 is held by being fitted. Due to the stepped arrangement of the composite anchor body, the permanent anchors 12 corresponding to the stepped surfaces disperse the ground load continuously so as to secure a predetermined anchor force in the soft ground as well as the general ground.

11 shows a state in which the tension members 2 of the three composite anchor bodies 30a, 30b, and 30c fixed to the external fixing body 38 are wrapped with a PP-based textile 40.

After the completion of the anchor construction, the tension member 2 fixed by the external fixing body 38 is cut by a welding machine to release the tensile force. As a result, a reaction force of a magnitude corresponding to the tension force acts on the tension member 2, and pushes the wedge assembly 6 which held the tension member 2 by this reaction force. As the wedge assembly 6 is pushed out, the wedge bleeding force of the tension member 2b is released to easily pull out the PC strand 2a coated on the PE tube 2b of the tension member 2.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, modifications, and alterations are possible within the scope without departing from the technical spirit of the present invention. It will be clear to those who have knowledge of the world.

1A and 1B are conceptual diagrams and peripheral friction distribution graphs for explaining the load change of the general tensile anchoring method.

2a and 2b is a conceptual diagram and peripheral friction distribution graph for explaining the load change of the general compression anchor method.

3A and 3B are conceptual diagrams and peripheral friction distribution graphs for explaining load changes in a general load distribution anchoring method.

Figure 4 is a schematic diagram showing the configuration of a composite anchor body according to the prior art.

5 is a cross-sectional view showing the configuration of the anchor fixture in FIG.

Figure 6 is a partial cross-sectional view showing the configuration of one embodiment of the tension-dispersion type composite anchor body capable of removing the tension material according to the present invention.

Figure 7 is a cross-sectional view showing a state in which the anchor support and the permanent anchor assembled to the coupler which is the main part of the present invention.

Figure 8 is a cross-sectional view showing the manufacturing process of the grip sleeve is pressed to the permanent anchor which is the main part of the present invention.

Figure 9 is a construction example of the tensile dispersion type composite anchor body capable of removing the tension material according to the present invention.

FIG. 10 is a cross-sectional view taken along line a-a 'in FIG. 9; FIG.

FIG. 11 is a sectional view taken along the line b-b 'of FIG.

DESCRIPTION OF THE REFERENCE NUMERALS

2: tension member 4: anchor fixture

6: wedge assembly 8: coupler

10: grip sleeve 12: permanent anchor

14: Block spacer 16: Anchor body

18: strand grip 20: support cone

Claims (11)

A tension member introduced into the free long section to provide a tension force; An anchor anchoring body including a wedge assembly for introducing a tensile force by holding a front end of the tension member and removing the tension member when the tension force is released, and a block body for supporting the wedge assembly therein; Connection mediation means that one side is detachably coupled to the block body of the anchor fixing body; A grip sleeve detachably coupled to the other side of the connection medium; And Permanent anchor is fixed to the grip sleeve, exerts the allowable anchor force in the anchorage section Tensile dispersion type composite anchor body capable of removing the tension material comprising a. The method of claim 1, And a block spacer having a plurality of grooves formed on an outer circumferential surface of the connection medium and having a plurality of grooves formed therein for supporting the tension member at the periphery thereof. The method of claim 1, Strand grip is fitted to the outer circumferential surface of the permanent anchor, to increase the binding with the grout put into the anchorage Tensile dispersion type composite anchor body capable of removing the tension material further comprising a. The method of claim 3, wherein Further comprising a support cone fitted to the tip of the permanent anchor, The strand grip 10. A tensile-dispersion compound anchor body capable of removing a tension member consisting of one selected from a cylindrically concave rounded center, a trapezoidal shape, a polygonal block including a rectangle, and a circular disk plate. The method of claim 1, It is installed on one end of the anchor fixing body tension reinforcement, tensile dispersion type composite anchor body that can further remove the tension material further comprises an anchor body for preventing the separation of the waterproof and steel wire due to the grouting. The method of claim 1, A female thread groove is formed inside the front end of the block body of the anchor fixing body, The connecting mediation means is a cylindrical block formed with a male screw on both sides of the stepped groove is formed on the side of the barrier film formed in the inner central portion and the female screw is formed on the one side of the stepped groove, the other side is fastened to the female screw groove of the block body Tensile dispersion type composite anchor body that can remove the tension material, characterized in that consisting of a coupler (Coupler). The method of claim 6, The grip sleeve is a tension-dispersible compound anchor type body that can remove the tension material, characterized in that the outer thread is processed in the outer circumferential surface of the male screw to be engaged with the female thread in the stepped groove of the coupler. The method of claim 1, And an insert plate mounted on the inner surface of the grip sleeve to increase a fixing force, wherein the permanent anchor and the grip sleeve are coupled by drawing. In the state where the tip of the tension member is held on the wedge assembly embedded in the block body of the anchor fixing body, stepped grooves are formed on both sides, and female threads are formed on one side of the stepped grooves, and male threads are formed on the outer surface of the coupler. To the female thread groove formed inside the distal end of the block body of the anchor fixing body, and at least two composite anchor bodies formed by fastening the grip sleeve compressing the permanent anchor to one female screw of the coupler are inserted into the anchor hole. 10. A tension-dispersion type composite anchor body capable of removing a tension member, characterized in that a permanent anchor of each compound anchor body is arranged in a step shape by inserting a tension member of a compound anchor body adjacent to each groove of a block spacer fitted to an outer surface thereof. Tighten the tip of the tension member to the wedge assembly embedded in the block body of the anchor fixing body, fasten the male screw formed on one side of the coupler to the female thread groove of the block body of the anchor fixing body, and attach the grip sleeve compressing the permanent anchor to the other side of the coupler. A first step of screwing into the formed female thread groove to form a composite anchor body; A block spacer is inserted into an outer surface of each coupler of the at least two compound anchor bodies, a tension member of the compound anchor body adjacent to the groove of the block spacer is inserted, and permanent anchors of each compound anchor body are arranged in a stepped manner to anchor holes. Inserting in the second step; A third step of fixing the grout material by filling the anchor hole and fixing the grout material to an external fixing body installed on a slope in a state in which a tensile force is applied to the tension member; After completion of the anchor construction, the fourth step of releasing the tensile force by cutting the tension member fixed by the external fixing body with a welding machine, etc .; A fifth step of releasing the wedge bite force of the tension member by pushing the wedge assembly holding the tension material by the reaction force as a reaction force having a magnitude corresponding to the tension force is applied to the tension member; And A sixth step of removing the tension member from the anchor fixture; Construction method of the tensile dispersion type composite anchor body capable of removing the tension material comprising a. 11. The method of claim 10, The second step includes the step of inserting a plurality of strand grips on the outer surface of the permanent anchor at predetermined intervals in order to increase the friction between the permanent anchor and the grout body tension-removable tension-dispersible composite anchor body, characterized in that Construction method.

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