KR100927091B1 - Combination anchor sharing load and Pressure grouting anchoring method using the same - Google Patents

Abstract

The present invention connects a plurality of load bearing body with a pipe, a computer bolt or a deformed reinforcing bar, so that the load transmission between each other in a fixed state on the ground, and configured to perform a load sharing role of the pipe to maximize the load distribution effect It relates to an anchor and a pressure grouting anchoring method using such an anchor.

The present invention relates to an anchor for efficiently sharing a load acting on the ground by connecting a plurality of load bodies to each other, comprising: a plurality of load bodies arranged in a line at intervals; A lecture line that extends rearward in a state in which the front end portion is engaged with each load body, and is installed to penetrate the load body disposed at the rear when the load body is disposed at the rear; A covering hose surrounding the strand; And a covering pipe surrounding the covering hose and coupling with the inner and outer bodies of the front and rear sides. It provides an integrated distributed compression anchor characterized in that it comprises a.

Tip Compression Anchor, Distributed Compression Anchor, Load Body, Mounting Station, Stranded Wire, Pipe

Description

Combination anchor sharing load and Pressure grouting anchoring method using the same}

The present invention relates to an earth anchor for preventing the earth wall from collapsing due to ground excavation due to underground excavation or to a reinforcement of a soft ground, and a construction method using the same. In particular, distributed compression for efficiently distributing load to a plurality of load bearing bodies. The present invention relates to an anchoring method that maximizes the ground reinforcement effect by applying a pressure grouting as well as construction with a type anchor and such a distributed compression anchor.

Figure 1 shows a conventional tip compression (load concentrated) anchor. The tip compression anchor has only one inner body at the tip, so that all the strands are connected to one lower body located at the tip so that the load is concentrated in one place. Therefore, there is a problem that it is difficult to secure the anchor force when the ground of the part where the lower body is located is weak.

In order to overcome the disadvantages of the tip compression anchor as described above, a distributed compression (load distribution) anchor has been developed. Figure 2 shows a conventional distributed compression (load distribution) anchor. Distributed compression anchors distribute the load using several load bearing bodies as shown.

However, the conventional distributed compression anchors could not perform organic load sharing between several load bearing bodies. For example, if the ground of the lowermost anchorage site is fragile and the load-sharing capacity of the weak ground cannot be expected, the structural role as the anchorage site cannot be performed from the lowermost load to the next lower body. . In addition, since the length of the strand is different according to the position of the load bearing body, the load transmitted to the first load body and the second load body is different by the axial rigidity difference of each strand.

The present invention overcomes the problems of the tip compression anchor in which load is concentrated on one load body and the problems of the distributed compression anchor, in which several load bodies are not able to perform organic load sharing. An object of the present invention is to provide an anchor that can share the load uniformly.

In another aspect, the present invention is another object to provide an anchoring method to increase the ground reinforcement effect, the bulb in the process of grouting the drilling hole to extend beyond the diameter of the hole.

By connecting a plurality of load-bearing body by the pipe, it is possible to transfer the load to each other in the fixed state on the ground, and maximize the load distribution effect through the integral distributed compression anchor configured to perform the load sharing role of the pipe.

In addition, by applying the integrated dispersion compression anchor as described above, by pressure grouting using a rubber packer, the ground reinforcement effect is maximized.

According to the present invention has the following effects.

First, by connecting the plurality of load bearing bodies with the covering pipe and the connecting pipe, the plurality of load bodies act integrally while sharing the load acting on the ground uniformly.

Second, sheathed pipes and connecting pipes are also used as actual anchorages for sharing the load.

Third, in the conventional tip compression anchor and distributed compression anchor, the friction force between the ground and grout does not act on the entire anchorage, so even if the anchorage is increased, there is no effect in increasing the anchor load, but the integrated distributed compression anchor of the present invention. The anchor load also increases with the length of the clad or connecting pipe.

Fifth, by forming a wide bulb by the pressure grouting anchoring method can extend the effective diameter of the anchor anchor can enhance the reinforcement effect of the ground.

I. Integrated  Distributed Compression Anchor

The present invention relates to an anchor for efficiently sharing a load acting on the ground by connecting a plurality of load bodies to each other, comprising: a plurality of load bodies arranged in a line at intervals; A lecture line that extends rearward in a state in which the front end portion is engaged with each load body, and is installed to penetrate the load body disposed at the rear when the load body is disposed at the rear; A covering hose surrounding the strand; And a covering pipe surrounding the covering hose and coupling with the inner and outer bodies of the front and rear sides. It is configured to include, the front end of the coating pipe is screwed with the front loading body, the strand is fixed by the wedge in close contact with the strand in the inner body, the wedge is a portion where the coating pipe is screwed On the opposite side of the cap is screwed with the inner body and provides an integrated distributed compression anchor characterized in that the fixed by the rubber ring fitted between the wedge and the cap.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

Figure 3 shows an integrated distributed compression anchor according to the invention, Figure 4 shows a longitudinal section of the integrated distributed compression anchor.

The integrated distributed compression anchor according to the present invention is composed of the load bearing body 10, the strand 20, the coating hose 21 and the coating pipe 30a as shown in Figs. The embodiment further provided with the pipe 30b is also provided.

The inner body 10 is arranged in a row with a plurality of intervals. The number of load-bearing bodies 10 may be adjusted by structural calculation according to the ground situation, but in the following, based on the embodiment in which two load-bearing bodies 10a and 10b are arranged as shown in FIGS. 3 and 4. Let's explain.

The strand 20 is connected to each of the lower body (10a, 10b) is connected to the rear, if there is a lower body 10b in the rear is installed to penetrate the lower body 10b disposed in the rear. The strand 20 is a component that transmits tension to each of the lower body (10a, 10b), the length of which varies depending on the placement position of the lower body (10a, 10b).

That is, as shown in FIG. 4, the length of the strand that penetrates the lower body 10b located at the rear and is coupled to the lower body 10a located at the front and the length of the strand that couples with the lower body 10b located at the rear are different. As such, the front and rear inner body 10a and 10b may be configured slightly differently.

Referring to the example illustrated in FIG. 4, only two through holes for coupling with the strands are formed in the front loading body 10a, while two through holes for coupling with the strands are formed in the rear loading body 10b. Of course, there are also formed two through-holes through which the strand wire coupled with the front inner body 10a penetrates, and the difference in appearance appears. On the other hand, the covering hose 21 is to wrap the strand wire 20, the covering pipe (30a) is a component that wraps around the covering hose 21 and is combined with each load-bearing body (10).

The present invention is to maximize the load distribution effect of the distributed compression anchor, in which anchorage is connected to each load body using a pipe that each of the load carriers independently acts in the conventional anchorage anchor anchor The load is distributed evenly. That is, the covering pipe 30a is coupled to each of the inner bodies 10a and 10b separately from that of the strands 20 separately from the respective inner bodies 10a and 10b, and thus to the strands 20. The tension transmitted by the load is distributed to each of the load bearing bodies 10a and 10b, and the covering pipe 30a connected to the load bearing body also shares the load.

In particular, among the strands that penetrate the lower inner body 10b at the rear and are coupled to the lower inner body 10a at the front, the covering pipe 30a surrounding the section between the rear lower bodies 10a and 10b is both front and rear. Since it is coupled to the lower load bodies 10a and 10b, respectively, the load applied to the lower load lower body 10a is transmitted to the lower load lower body 10b along the covering pipe 30a of the section, and vice versa. Since the load applied to the lower body 10b is also transmitted to the lower body 10a in front of the covering pipe 30a, the front and rear loading bodies 10a and 10b and the covering pipe 30a exhibit integral behavior. It acts as a single anchorage.

At this time, irregularities are formed on the outer circumferential surface of the coating pipe 30a to increase the adhesion to the solidified grout material, thereby increasing the pullout resistance of the entire anchor.

Meanwhile, as shown in FIGS. 3 and 4, connecting pipes 30b having irregularities formed on the outer circumferential surface are disposed between the front and rear load-bearing bodies 10a and 10b, and both ends of the connecting pipes 30b are disposed. By connecting each of the front and rear load-bearing bodies 10a and 10b, respectively, it is possible to further increase the load dispersion effect and the pullout resistance of the anchorage.

The covering pipe 30a and the connecting pipe 30b are components for efficient load distribution between the plurality of load bearing bodies 10, and may be made of a durable steel material or an FRP material.

On the other hand, the deformed reinforcing bar (70a) or computer bolts (70b) may be connected between the load bearing body. As such, when connecting the deformed reinforcing bar 70a or the computer bolt 70b between the lower body, each inner body is interposed between them in a zigzag form, or connected in a straight line through the outer body of the lower body, or the center of the inner body of the lower body. It can be configured by a method of connecting in a straight line to penetrate.

FIG. 6A illustrates an embodiment in which a deformed steel bar and a computer bolt are connected in zigzag form between three load bodies, and FIG. 6B shows a front and rear cross-section of each of the load bodies used in the embodiment shown in FIG. 6A. .

FIG. 7A illustrates an embodiment in which the deformed reinforcing bars and the computer bolts are connected to penetrate three inner peripheral body lines in a straight line, and FIG. 7B illustrates front and rear cross-sections of each of the lower body bodies used in the embodiment shown in FIG. 7A. It is.

FIG. 8A illustrates an embodiment in which the deformed steel bars and the computer bolts are connected to the three inner centers of the inner body in a straight line, and FIG. 8B shows the front and rear cross sections of each of the lower body used in the embodiment shown in FIG. 8A. It is.

Such an effect of the present invention can be grasped by analyzing the graph shown in FIG. 9. (A), (b), (c) of FIG. 9 are graphs showing load sharing states for each section of the tip compression anchor, the distributed compression anchor, and the integrated distributed compression anchor.

As shown in FIG. 9 (a), the tip compression anchor is concentrated at the load anchoring portion of the tip, and the slip of the anchor (between the anchor grout and the ground) when the concentrated maximum load exceeds the ultimate load of the soft ground. May occur.

In addition, the distributed compression anchor has the effect of reducing the maximum load acting on the ground by sharing the load acting on the ground as shown in FIG. 9 (b). However, as can be seen from the graph, each load body is not complementary and behaves independently, and no load distribution between loads is achieved. Therefore, when the ground on which the innermost load bearing body is mounted is fragile and destroyed, all the loads acting on the ground are transferred to the next loading body, so that the same concentrated phenomenon as in the above-described end compression anchor is expected.

On the contrary, the integrated distributed compression anchor according to the present invention has localized failures by uniformly distributing the load in the anchorage, thereby making the maximum load acting on the ground smaller as shown in FIG. 9 (c). ) And slip (between anchor grout and ground).

This effect is achieved by integrally connecting a plurality of load carriers by the covering pipe 30a and the connecting pipe 30b or the deformed reinforcing bar 70a or the computer bolt 70b, and integrally operating the covering pipe 30a. This is because there is also a load sharing effect between the coupling pipe 30b or the deformed rebar 70a or the computer bolt 70b itself.

Accordingly, in the integrated distributed compression anchor according to the present invention, the length of the coated pipe 30a or the connecting pipe 30b, which plays a substantial load sharing role by using the coupler 40 (see FIG. 3), or the deformed rebar ( By adjusting the length of the 70a) and the bolt (70b) it is possible to adjust the length of the anchorage.

On the other hand, the coupling of the load bearing body 10 and the strand 20 may adopt the following wedge coupling method. As shown in FIGS. 4 and 5, the tip of the covering pipe 30a is screwed to the load body 10 in the front, and the strand 20 is the strand in the load body 10. It is fixed by the wedge 12 in close contact with the (20), the wedge 12 is the cap 13 which is screwed with the inner body 10 on the opposite side of the portion where the coating pipe 30a is screwed; , Wedge coupling method is characterized in that it is fixed by the rubber ring 14 fitted between the wedge 12 and the cap (13).

That is, the inner body 10 is formed with a conical through hole 11a for wedge coupling with the strand 20, and the steel strand 20 by close contact with the wedge 12 inserted into the conical through hole 11a. ) Is combined with the lower body 30, in which case the cap 13 is inserted into the end of the conical through hole (11a), and the rubber ring 14 is tightened by the cap 13 to the wedge 12 It can be firmly fixed to the lower body 10 and the stranded wire 20 by pushing.

II. Integrated  Using distributed compression anchor Pressurized Grouting Anchoring  Method

The present invention comprises the steps of (a) perforating the ground (1) to form a perforation hole (2); (b) connecting the rubber packer 50 and the grout hose 60 to the integrated dispersion compression anchor 100 described above and inserting the rubber packer 50 into the drilling hole 2; (c) performing primary grouting in the drilling hole 2; (d) expanding the rubber packer 50 with liquid or gas to segment the perforation hole 2 into the lower layer and the upper layer; (e) performing secondary grouting on the lower layer of the drilling hole 2 to expand bulbs in the lower layer of the drilling hole 2; (f) drawing the grout hose 60 in the boring hole 2 and shrinking the rubber packer 50 to cure the grout material 3, 3 '; Provides with a pressure grouting anchoring method using an integrated distributed compression anchor comprising a.

Pressurized grouting anchoring method carried out in the above steps is to expand the rubber packer 50 in the drilling hole (2) to make the lower layer of the drilling hole into a closed space, and then pressurized grouting work to fill the gap and ground grout in the ground The effective diameter of anchor anchor can be expanded, which can enhance the reinforcement effect of the ground.

The pressure grouting anchoring method according to the present invention will be described in detail for each step divided above (see FIGS. 10A to 10G).

1.step (a)

This step is to form a hole (2) by drilling the ground (1). The drilling operation may use a casing (see FIG. 10A).

2. Step (b)

This step is a step of connecting the rubber packer 50 and the grout hose 60 to the integral dispersion compression anchor 100 described above and inserting it into the drilling hole (2).

The rubber packer 50 may be inserted after connecting the strand 20, the grout hose 60 and the gas or liquid injection tube (not shown). The rubber packer 50 installation position may adopt an appropriate point by structural calculation (see Fig. 10b).

The rubber packer 50 includes a front and rear end packing member 51, a front end and front end packing member 51, and a rubber tube 52 as shown in FIGS. 11A and 11B. It can be used that consists of a steel band (53) surrounding the, the strand wire 20 and the grouting hose 60 is installed to penetrate the packing member 51 of the front and rear ends, the packer hose for injecting or extracting gas or liquid ( 54) is installed to connect into the rubber tube.

3. Step (c)

This step is to perform the first grouting in the drilling hole 2, the drilling hole 2 is filled by the grout material (see Fig. 10c).

4. Step (d)

This step is to inflate the rubber packer 50 with liquid or gas to segment the drilling hole 2 into the lower layer and the upper layer, injecting the gas or liquid into the rubber packer 50, thereby providing the rubber packer 50. ) Is expanded to be in close contact with the inner surface of the drilling hole. In this step, the lower part of the portion where the rubber packer 50 is installed in the punching hole 2, that is, the lower layer of the punching hole is in a sealed state (see FIG. 10D).

5. Step (e)

This step is to expand the bulb of the lower layer of the drilling hole 2 by performing a second grouting on the lower layer of the drilling hole (2).

In this step, the grouting is performed on the lower layer of the drilling hole, and the pressure grouting is performed so that the grout material 3 'is permeated around the lower layer of the drilling hole. Since the pressure grouting is performed in the enclosed space by the step (d), the grout material 3 is pushed into the gap around the drilling hole, and the gap diameter filling and the pulverization are performed around the drilling hole, so that the effective diameter of the anchor anchor is expanded. (See FIG. 10E).

6. Step (f)

This step is the step of drawing the grout hose 60 in the drilling hole (2) and shrink the rubber packer 50, and curing the grout material (3, 3 ').

Anchor that removes liquid or gas from the rubber packer 50 and recovers it to its original state, and cures the grout materials 3 and 3 ', thereby forming a wider bulb, and uniformly sharing the load acting on the ground by a plurality of inner bodies. Forming a sieve (see FIG. 10F).

1 shows a conventional tip compression anchor.

Figure 2 shows a conventional distributed compression anchor.

Figure 3 illustrates an integrated distributed compression anchor according to the present invention.

Figure 4 shows a longitudinal section of the integrated distributed compression anchor.

5 illustrates a state in which the strand is coupled in a wedge shape in the inner body.

FIG. 6A illustrates an embodiment in which the deformed steel bars and the computer bolts are connected in a zigzag form between three inner bodies.

Figure 6b shows a front and rear cross-section of each of the load bearing body used in the embodiment shown in Figure 6a.

FIG. 7A illustrates an embodiment in which the deformed steel bars and the computer bolts are connected to penetrate three inner rims in a straight line.

FIG. 7B shows a front and rear cross section of each of the load carriers used in the embodiment shown in FIG. 7A.

FIG. 8A illustrates an embodiment in which the deformed steel bars and the computer bolts are connected to the three inner core parts in a straight line.

Figure 8b shows a front and rear cross-sectional view of each of the load bearing body used in the embodiment shown in Figure 8a.

FIG. 9 is a graph showing loads of the front end compression anchor, the distributed compression anchor, and the integrated distributed compression anchor for each part.

10A to 10F illustrate each step of a pressure grouting anchoring method using an integrated distributed compression anchor.

11A and 11B are a perspective view and a sectional view of a rubber packer.

<Explanation of symbols for main parts of the drawings>

1: ground 2: drilling hole

3, 3 ': grout wood

10, 10a, 10b, 10c: load bearing body 20: stranded wire

21: coated hose 30a: coated pipe

30b: connection pipe 40: coupler

50: rubber packer 60: grout hose

70a: Deformed steel bar 70b: Computer bolt

100: integrated distributed compression anchor

Claims (5)

The present invention relates to an anchor for efficiently sharing a load acting on the ground by connecting a plurality of load-bearing bodies, A plurality of inner bodies 10 arranged in a line at intervals; The front end portion is coupled to each of the lower body 10, and the rear end, if the lower body is disposed in the rear, the lecture line 20 is installed to penetrate the lower body disposed in the rear; A covering hose 21 surrounding the strand 20; And A covering pipe (30a) surrounding the covering hose (21) and coupled with the inner and outer bodies 10 in front and rear; It is configured to include, The front end of the covering pipe 30a is screwed with the front load bearing body 10, The strand 20 is fixed by the wedge 12 in close contact with the strand 20 in the load body 10, The wedge 12 is fitted between the cap 13 and the wedge 12 and the cap 13 screwed to the inner body 10 on the opposite side of the portion where the coating pipe 30a is screwed Integrated distributed compression anchor 100, characterized in that fixed by the rubber ring (14). In claim 1, Integrated dispersion compression anchor 100, characterized in that the irregularities formed on the outer peripheral surface of the coating pipe (30a). In claim 2, Concave-convex is formed on the outer circumferential surface, integral dispersion compression anchor 100 characterized in that it further comprises a connecting pipe (30b) for coupling with the inner and outer body. The method according to any one of claims 1 to 3, Integral distributed compression anchor 100, characterized in that it further comprises a deformed reinforcement or computer bolts connected between each load body. (a) drilling the ground 1 to form a drilling hole 2; (b) connecting the rubber packer 50 and the grout hose 60 to the integrated dispersion compression anchor 100 of claim 4 and inserting the rubber packer 50 and the grout hose 60 into the drilling hole 2; (c) performing primary grouting in the drilling hole 2; (d) expanding the rubber packer 50 with liquid or gas to segment the perforation hole 2 into the lower layer and the upper layer; (e) performing secondary grouting on the lower layer of the drilling hole 2 to expand bulbs in the lower layer of the drilling hole 2; (f) drawing the grout hose 60 in the drilling hole 2 and then contracting the rubber packer 50 and curing the grout material 3, 3 '; Pressurized grouting anchoring method using an integrated dispersion compression anchor comprising a.

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