KR20080078434A - Multi packer anchor and the anchor constructing method thereof - Google Patents

Abstract

A multi packer anchor and an anchor constructing method using the same are provided to reduce the size of the anchor by injecting injected material in injection hoses whose diameter is smaller than that of inner injection pipe. A multi packer anchor comprises a plurality of steel wires(210), a rubber packing(220), a number of packers(230), and a plurality of injection hoses(240). The rubber packing includes first and second injection hose holes, and a plurality of steel wire holes. The packer surrounds the steel wires and the rubber packing. The injection hoses are inserted in the first and second injection hose holes to inject injected material in the packet at the same time. The number of the injection hoses is corresponding to the number of the packers.

Description

MULTI PACKER ANCHOR AND THE ANCHOR CONSTRUCTING METHOD THEREOF}

1 is an installation view of the ground anchor according to the prior art,

2 is an installation view of the ground anchor using a conventional complex packer,

3 is a front view and a side view of the combination of steel wire spacers and steel wires of the ground anchor using a conventional composite packer,

Figure 4 is a side view showing the configuration of a multi-packer anchor according to the present invention,

5 is a perspective view showing the configuration of a multi-packer anchor according to the present invention,

6 is a cross-sectional view taken along line A-A of FIG.

Figure 7 is a side view showing the configuration of a multi-packer anchor according to another embodiment of the present invention,

8a to 8f is a construction flowchart for explaining the anchor construction method using a multi-packer anchor according to the present invention.

<Explanation of symbols on main parts of the drawings>

101: casing 103: perforated rod

105: drilling hole 107: injection tube

200: multiple packer anchor 210: steel wire

220: rubber packing 230: packer

240: injection hose 250: injection pump

The present invention relates to a multiple packer anchor and an anchor construction method using the same, and more particularly, to a multiple packer anchor for fixing a plurality of steel wires and injection hoses corresponding to the number of packers in a rubber packer and an anchor construction method using the same. will be.

Generally, in the case of various excavation works such as underground excavation work, tunnel work, slope work, retaining wall work, etc., it is necessary to install earth plate or support the earth plate in order to prevent the surrounding rock and soil from collapsing. We carry out anchoring work.

In the ground anchoring construction method according to the prior art, as shown in Fig. 1, using a casing and a drilling rod, the length of the inner body 41 of the gap member formed with the anchor steel wire 2 was drilled, and the punched hole 1 was completed. An anchor is inserted into the cavity, and the first injection grouting is performed by gravity to fill the gap between the casing and the anchor. When the first injection grouting is completed, the casing is drawn out. Due to the perforation using water or air for the slime treatment, the periphery of the perforated hole is considerably disturbed due to the perforation using the water or air. There is a problem of sinking to the bottom of the boring ball of the anchor body, loss of the ground from the first injection grouting material, etc., and the end of the casing draws the wire 70 between the free ten (10) and the fixing ten (50) Injecting the injection material into the fixed and installed expansion packer 51 by using the packer part injection hose 110 so that the injection material does not flow back during the second injection of the fusing unit, and the fusing unit injection hose 100 is fixed to the fusing unit. Second injection grouting is carried out by using the cement (4) in the drilling hole to freeze. However, when drawing the casing after the first injection, there is a problem in securing the quality even if the secondary pressure injection is carried out in a partially recessed state, and the injection material is filled only in the partially collapsed drilling hole or penetrated into the surrounding ground to form a well-fixed anchorage. There are a lot of cases that can not be. In particular, in the landfill layer and the gravel deposit layer having large voids, the injection material is immediately lost into the strata, thus preventing the formation of an earth anchorage.

According to the prior art as described above, when the injection material is not injected in a uniform form and is locally enlarged and decreased, the share strength is not obtained because the adhesive strength is not obtained. The problem often occurs after the construction is completed, or it may lead to collapse.

In addition, due to the above reasons, the fixing unit is formed by extending the fixing unit to the maximum length of 8 ~ 10m, which is the theoretical length of the anchor anchor, or by drilling deep into the hard ground where tensile force can be generated. There are many problems such as economic loss, poor workability.

In order to solve the above problems, the earth anchor using the complex packer of the domestic patent registration No. 0437910 and the earth anchor construction method using the same has been developed.

Earth anchor using the composite packer and the earth anchor construction method using the same, using the expansion packer 51 and the pressure packer 55, as shown in Figure 2, acupressure type anchorage (56) at the tip of the fixing unit The composite anchoring unit 50 is formed by forming a main surface friction type fixing unit 52 on the acupressure fixing unit. In the case of the friction type anchorage 52, when the injection material is pressurized and injected into the expansion packer 51, the injection material, that is, the mixed water of the filler, is discharged out of the expansion packer by the injection pressure, so that the curing time of the injection material is high and the density is high and high strength. Anchor is made, and part of the injection material (4, cement) is leaked to the outside of the expandable packer by pressurization to consolidate the permeable ground of the injection material to increase the frictional force, used in the case of acupressure anchorage 56 Acupressure type packer 55 is used, which uses two or more layers of specially engineered geotextiles to have sufficient tensile strength during expansion of preformed holes.

The steel wire spacers 40 and 45 are inserted into the external injection pipes 20 and 30 at regular intervals to isolate the steel wire 2 from the external injection pipes, and to expand the expansion packer 51 and the acupressure packer 55. It consists of a spacer inner body 41 and the outer cover 42 to be a position for fixing using an iron wire or steel band.

In addition, as shown in FIG. 3, the spacer inner body 41 is inserted into the outer injection pipe 20 at a predetermined interval, and the wire is grooved radially in the outer circumferential surface of the spacer inner body 41. Installed along and covered with a rubber outer cover (42) to cover the outer space 42, and the gap outer cover 42 is formed with an uneven portion 43 is fixed to the packer using an iron wire or steel band The inner body and the outer cover may be formed integrally, but may be separately installed as needed.

The hole of the steel spacer 40 is formed by the required number of steel wires, or when using a small number of steel wires using a spacer made of 12 steel wire holes, the remaining steel wire hole is slightly smaller than the size of the steel wire It is made of rubber rods that are made larger, and grease is injected into both sides of the spacer and the steel wire holes to prevent the injection material from flowing back into the expandable packer through the steel wire holes when pressure is injected into the packer for a certain period.

However, the conventional anchor pack using the complex packer and the earth anchor construction method using the same, the inlet is formed radially in the outer injection pipe, and the internal injection pipe is inserted into the outer injection pipe step by step expansion packer and acupressure When the injection is completed to some extent while expanding the type packer, there is a problem in that the construction time increases because the inner injection pipe installed in the outer injection pipe is moved toward the inlet to expand the expandable packer and the acupressure packer in the next part.

In addition, the outer injection pipe has a diameter enough to insert the inner injection pipe, the larger the diameter of the outer injection pipe is relatively increased in the size of the anchor, the larger the size of the anchor hole increases the size of the anchor construction There is another problem that becomes difficult.

The present invention is to solve the above problems, a plurality of steel wires and the number of wires and the number of the packers corresponding to each packer fixed to the injection hose, the injection material to the injection hose at the same time to reduce the construction time multiple Its purpose is to provide a packer anchor and an anchor construction method using the same.

In addition, the present invention provides a multi-packer anchor and anchor construction method using the same to reduce the size of the anchor by relatively injecting the injection material through the injection hose having a relatively smaller diameter than the inner injection pipe to facilitate anchor construction. There is a purpose.

Features of the present invention for achieving the above object,

A plurality of steel wires; It is formed in a circular plate shape to fix the steel wire, the first injection hose hole is formed in the center, a plurality of steel wire hole and the second injection hose hole is formed radially around the first injection hose hole, the fixing Rubber packing installed in multiple stages in the cabinet area; A plurality of packers wrapped around the outside of the steel wire and the rubber packing to be formed in the anchorage area; And a plurality of injection hoses having a number corresponding to the number of packers and installed in the first injection hose hole and the second injection hose hole of the rubber packing and simultaneously injecting the injection material into each of the packers. do.

Here, the second injection hose hole of the rubber packing is formed between the steel wire hole and the steel wire hole.

Here, the packer wraps one packer on the outside of the steel wire and the rubber packing, and then bundles the outer circumference of the rubber packing with a rubber band to form a plurality of independent packers.

Here, the packer wraps each independent packer on the outside of one rubber packing and steel wire and the other rubber packing, and then bundles the outer circumference of each rubber packing with a rubber band to form a plurality of independent packers.

Here, the plurality of independent packers may have the same expansion size or different from each other.

Here, a plurality of injection pumps are individually connected to the plurality of injection hoses 1: 1, and the injection material is injected simultaneously into the plurality of packers.

Another feature of the invention,

An anchor construction method using the multiple packer anchor, the method comprising: drilling a hole to a predetermined depth by using a casing and a drilling rod to form a drilling hole; Drawing only the perforated rod in the perforation hole, inserting a separate infusion tube to the tip of the casing, and cleaning the inside of the casing through gravity injection of injection material; Inserting the multipacker anchor into the casing when the inside of the casing is cleaned; Performing a pressure injection of the injection material into the fusing area of the multipacker anchor by repeatedly drawing a predetermined amount of the casing in the fusing area and pressing the injection material at a predetermined pressure through the injection pipe in the casing; Drawing the casing after the injection of the injection material into the fusing area is completed, and simultaneously pressing and inflating the injection material at a predetermined pressure into each packer of the multiple packer anchor to pressurize and expand the plurality of packers simultaneously; And when the pressure expansion of the packer is completed, inserting the injection tube into the free field region of the multi-packer anchor and re-injecting the injection material through gravity injection.

Here, the process of pressurizing and expanding the packer is a one-to-one connection between each injection hose connected to inject the injection material into each packer and an injection pump for injecting the injection material in a 1: 1 manner to simultaneously pressurize and expand each packer. .

Here, the said constant pressure is 3-5 kg / cm <2>.

Hereinafter, with reference to the accompanying drawings, the configuration of a multi-packer anchor according to the present invention will be described in detail.

In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

Figure 4 is a side view showing the configuration of the multi-packer anchor according to the invention, Figure 5 is a perspective view showing the configuration of the multi-packer anchor according to the invention, Figure 6 is a cross-sectional view of Figure 5, Figure 7 of the present invention Side view showing the configuration of a multi-packer anchor according to another embodiment.

4 to 7, the multiple packer anchor 200 according to the present invention includes a steel wire 210, a rubber packing 220, a packer 230, and an injection hose 240.

First, the steel wire 210 is formed in a rod shape of a metal material. At this time, the steel wire may be coated on the surface according to the selection.

In addition, the rubber packing 220 is formed in a circular plate shape to fix the steel wire 210, a first injection hose hole 221 is formed in the center, a plurality of around the first injection hose hole 221 The steel wire hole 223 and the second injection hose hole 225 are formed radially, and are provided in multiple stages in the anchorage region a. Here, the second injection hose hole 225 of the rubber packing 220 is formed between the steel wire hole 221 and the steel wire hole 221.

In addition, the packer 230 is wrapped on the outside of the steel wire 210 and the rubber packing 220 to be formed in the anchorage area (a). Here, the packer 230 wraps one packer 230 on the outside of the steel wire 210 and the rubber packing 220, then bundles the outer periphery of the rubber packing 220 with a rubber band 231, a plurality of independent packers The outer periphery of each rubber packing 220 may be formed after wrapping the respective packers on the outside of one rubber packing 220 and the steel wire 210 and the other rubber packing 220. A plurality of independent packers may be formed by banding the bands 231. Here, the plurality of independent packers 230 may be formed with the same or different expansion sizes as shown in FIG.

On the other hand, the injection hose 240 has a number corresponding to the number of packers 230, is installed in the first injection hose hole 221 and the second injection hose hole 225 of the rubber packing 220, each packer Inject the injection material into the 230 at the same time. Here, a plurality of injection pumps 250 are individually connected to the plurality of injection hoses 240 in a 1: 1 manner, and the injection material is injected simultaneously into the plurality of packers 230.

Hereinafter, an anchor construction method using multiple packer anchors according to the present invention will be described in detail with reference to FIGS. 4 to 8F.

8A to 8F are construction flowcharts for explaining an anchor construction method using multiple packer anchors according to the present invention.

4 to 8F, first, as shown in FIG. 8A, a perforation hole 105 is formed by drilling to a predetermined depth in the ground using a casing (or rod) 101 and a perforating rod 103. . At this time, the ground is a general soil section, landfill soil, sand gravel and stone layers, slopes with cavities and joints, sections with groundwater flow, soft ground and the like.

Then, as shown in FIG. 8B, only the drilling rod 103 is drawn out of the drilling hole 105, and a separate injection tube 107 is inserted to the tip of the casing 101, and then the casing 101 is injected through the gravity injection of the injection material. Clean the inside.

Then, as shown in FIG. 8C, when the inside of the casing 101 is cleaned, the multi-packer anchor 200 is inserted into the casing 101.

When the insertion of the multi-packer anchor 200 is completed, as shown in FIG. 8D, the casing 101 and the injection tube 107 are drawn out in the anchorage region a, and then the injection tube 107 is inserted into the casing 101. By repeating the process of pressurizing the injection material at a predetermined pressure through a) it is pressurized injection injection material in the anchorage region (a) of the multi-packer anchor 200.

Then, as shown in FIG. 8E, when the pressure injection of the injection material is completed in the anchorage region a, the casing 101 and the injection pipe 107 are drawn, and then each injection hose 240 of the multiple packer anchor 200 is removed. Each injection pump 250 is connected to each other, and then each injection pump 250 is operated simultaneously to inject the injection material into each packer 230 of the multiple packer anchor 200 at a pressure of 3 to 5 kg / cm 2. Pressurize and expand the plurality of packers 230 at the same time. Here, the process of pressurizing and expanding the packer 230 is a 1: 1 connection between each injection hose 240 connected to inject the injection material into each packer 230 and the injection pump 250 for injecting the injection material by 1: 1. At the same time, each packer 230 is pressurized and expanded at the same time.

When the pressure expansion of the packer 230 is completed, as shown in FIG. 8F, the injection pipe 107 is inserted into the free field region b of the multiple packer anchor 200, and the injection material is re-injected through gravity injection.

According to the present invention, a multi-packer anchor and an anchor construction method using the same, as described above, a plurality of steel wires and a number of steel wires and the corresponding number of each packer to fix the injection hose, the injection material is injected into the injection hose at the same time construction time It is possible to shorten, and by injecting the injection material through the injection hose relatively smaller than the inner injection pipe has the advantage that the anchor can be easily reduced by reducing the size of the anchor relatively.

As those skilled in the art would realize, the described embodiments may be modified in various ways, all without departing from the spirit or scope of the present invention. It is to be understood, however, that the present invention is not limited to the specific forms referred to in the description, but rather includes all modifications, equivalents, and substitutions within the spirit and scope of the invention as defined by the appended claims. Should be.

Claims (9)

A plurality of steel wires; It is formed in a circular plate shape to fix the steel wire, the first injection hose hole is formed in the center, a plurality of steel wire hole and the second injection hose hole is formed radially around the first injection hose hole, the fixing Rubber packing installed in multiple stages in the cabinet area; A plurality of packers wrapped around the outside of the steel wire and the rubber packing to be formed in the anchorage area; And It has a number corresponding to the number of the packer, characterized in that it comprises a plurality of injection hoses which are installed in the first injection hose hole and the second injection hose hole of the rubber packing to inject the injection material into each of the packer at the same time Multiple packer anchors. The method of claim 1, The second injection hose hole of the rubber packing, Multiple packer anchors, characterized in that formed between the steel wire hole and the steel wire hole. The method of claim 1, The packer, After wrapping one packer on the outside of the steel wire and the rubber packing multi-packer anchor, characterized in that to form a plurality of independent packers by tying the outer periphery of the rubber packing with a rubber band. The method of claim 1, The packer, A multipacker anchor, characterized in that each packer is wrapped around the outside of one rubber packing and steel wire and the other rubber packing, and the outer periphery of each rubber packing is bundled with a rubber band to form a plurality of independent packers. The method according to claim 3 or 4, The independent plurality of packers, Multiple packer anchors, characterized in that their expansion sizes are the same or different. The method of claim 1, In the plurality of injection hoses, A plurality of packer anchors, characterized in that a plurality of infusion pumps are individually connected in a 1: 1, and simultaneously injecting the injection material into the plurality of packers. In the anchor construction method using a multi-packer anchor of claim 1, Drilling to a predetermined depth by using a casing and a drilling rod to form a drilling hole; Drawing only the perforated rod in the perforation hole, inserting a separate infusion tube to the tip of the casing, and cleaning the inside of the casing through gravity injection of injection material; Inserting the multipacker anchor into the casing when the inside of the casing is cleaned; Performing a pressure injection of the injection material into the fusing area of the multi-packer anchor by repeatedly drawing a predetermined amount of the casing in the fusing area and pressing the injection material at a predetermined pressure through the injection pipe in the casing; Drawing the casing after the injection of the injection material into the fusing area is completed, and simultaneously pressing and inflating the injection material at a predetermined pressure into each packer of the multiple packer anchor to pressurize and expand the plurality of packers simultaneously; And When the pressure expansion of the packer is completed, inserting the injection tube in the free field region of the multi-packer anchor and re-injecting the injection material through gravity injection, anchor construction method using a multi-packer anchor, characterized in that. The method of claim 7, wherein Pressing and expanding the packer, Anchor construction using multiple packer anchors, characterized in that by simultaneously connecting the respective injection hose and the injection pump for injecting the injection material to inject the injection material into each of the packers in a 1: 1 manner at the same time to pressurize and expand each packer at the same time Way. The method of claim 7, wherein The constant pressure is, Anchor construction method using a multi-packer anchor, characterized in that 3 ~ 5kg / ㎠.

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