KR101582606B1 - Multi-hole jet injection device for fill dam and grout injection method for fill dam using the same - Google Patents

Abstract

The present invention relates to a multi-hole spray injection device for a fill dam and a grout injection method for a fill dam using the same. The multi-hole spray injection device for a fill dam comprises: a casing inserted into a drilled hole of a fill dam; a packer disposed on an end of the casing to seal the casing; and a pipe penetrating the packer and transporting grout therein. The present invention sprays grout through a plurality of injection holes disposed on a circumference of an injection pipe in all directions to remove a clay layer or a cement layer formed on a wall surface of the drilled hole while drilling, injecting, or drawing the casing to easily inject the grout into an air gap of the fill dam. Exposure of the grout to a ground surface caused by clogging the wall surface is prevented, and stopping injection, reconstructing, cleaning a hollow wall, etc. are not needed, thereby shortening construction time and reducing costs. Also, the grout can be easily injected by a low pressure to prevent a fracture of the fill dam by a water pressure or a piping phenomenon.

Description

Technical Field [0001] The present invention relates to a multi-hole jet injection device for a fill dam and a grout injection method for a fill dam using the same,

The present embodiment relates to a porous injection injecting apparatus for a fill dam and a grout injection method of a fill dam using the same.

Typical pumping methods for ground reinforcement and order of fill dams are rod injection method, menjet tube injection method, and casing method. In the case of rock, there are nipple method and packer method. However, the rod injection technique is simple to inject but requires high pressure and poor quality. The nozzle tube injection technique can manage the quality well. However, after installing the sleeve pipe, fill the space between the wall and the borehole, The installation process is complicated, which is disadvantageous in terms of construction cost and construction period.

Therefore, in countries such as Korea where seasonal changes are severe and there is a rainy season, the injection process must be completed within a short period of time, avoiding the rainy season and the winter season. Therefore, the casing method is advantageous in terms of quality assurance and construction period.

However, in the casing method, the gap or microcracks of the perforated wall can be blocked by the fine clay particles generated at the time of punching and the cement particles generated at the time of grouting, and the fine clay particles and the cement particles can be accumulated at the bottom of the perforation, Further, when the casing is pulled out, grout injection is hampered due to the formation of a thin slit in the perforated wall.

When the injection of grout is obstructed as described above, the injection pressure rises rapidly, and the injection pressure which is raised may induce the hydraulic pressure column and piping phenomenon. Also, the cement milk is leaked to the surface through the gap between the casing and the perforated wall, After a certain period of time, clean and rehabilitate the walls. On the other hand, there is a possibility that existing microcracks may be further expanded by using high-pressure water or using a dispersant in the case of stopping the injection and cleaning the air wall.

Patent 1: Korean Patent No. 10-0970497

In order to solve the problems described above, grout is radiated in four directions by a plurality of injection holes provided around the injection pipe to remove the clay or cement film formed on the wall surface of the tool during perforation, injection, or casing drawing, A perforation injection device of a fill dam which facilitates injection of grout and which does not require the leakage of the ground surface of the grout due to the clogging of the wall, the interruption of the injection, the rework, and the cleaning of the air wall, And to provide a grout injection method of a fill dam using the same.

Further, the grout can be easily injected into the fill dam by low pressure by removing the clay or cement film formed on the wall surface of the cloth tool during perforation, injection, or casing drawing by radiating the grout in all directions with a plurality of injection holes provided around the injection pipe. And to provide a method of injecting a porous injection of a fill dam to prevent hydraulic piping and piping phenomenon, and a method of grout injection of a fill dam using the same.

In addition, the fine clay particles accumulated in the lower part of the cloth tool and the grout are radiated to the inside of the cement particle through a plurality of injection holes provided around the injection pipe, and the fine clay particles accumulated in the lower part of the cloth tool and the inside of the cement particles And a grout injection method of a fill dam using the same.

In addition, since the injection hole of the injection pipe is formed by the end of the inner light, it is possible to prevent clogging of the injection hole and diffuse the radiated grout so that the grout does not destroy the wall surface of the tool, A porous injection injection apparatus and a grout injection method of a fill dam using the same.

In addition, by forming a plurality of cutout grooves in the circumferential direction outside the injection hole of the injection pipe, clogging of the injection hole is prevented, and the grout to be radiated is diffused so that the grout does not destroy the wall surface of the tool, A porous injection device for a fill dam to remove a formed film, and a grout injection method of a fill dam using the same.

The present invention also provides a porous injection injector for a fill dam in which grout is prevented from leaking by providing a rubber sleeve between a casing and a packer, and a grout injection method of a fill dam using the same.

Also, the present invention provides a porous injection apparatus for a fill dam in which a plurality of transverse concavo-convex portions are provided in a rubber sleeve, thereby preventing the leakage of the grout by increasing the sealing force, and a grout injection method of the fill dam using the same.

According to an aspect of the present invention, there is provided a porous-spray injecting apparatus for a fill dam, including: a casing inserted into a cloth tool of a fill-dam; A packer provided at an end of the casing to seal the casing; And a pipe passing through the packer and transporting the grout.

The apparatus may further include a rubber sleeve provided between the casing and the packer.

In addition, the rubber sleeve may include a plurality of transversely-oriented concave-convex portions to increase the sealing force.

The injection pipe may further include a plurality of injection holes around the injection pipe to radiate the grout to the four sides to remove the film formed on the wall surface of the cloth tool to inject the grout. It can be facilitated.

Further, the injection hole may be formed by an endowment of the inner light to prevent clogging of the injection hole.

In addition, the injection hole has a plurality of cutout grooves formed on the outer side in the circumferential direction to prevent clogging of the injection hole and diffuse the grout.

A grout injection method of a fill dam using a porous injection injection device of a fill dam according to an exemplary embodiment of the present invention includes: a cloth tool forming step of forming the cloth tool on the fill dam; An injection device inserting step of inserting the porous injection injection device of the fill dam into the cloth tool; A grout injection step of injecting the grout through the pipe; An injector elevating step of elevating the perforated injection injector of the fill dam by a predetermined distance; And repeating the grouting step and the injecting apparatus elevating step.

According to the present invention, the grout is radiated in four directions by a plurality of injection holes provided around the injection pipe to remove the clay or cement film formed on the wall surface of the cloth tool during perforation, injection, or casing drawing, It is possible to provide an effect of shortening the air and reducing the cost because it is not necessary to leak the ground surface of the grout due to the clogging of the wall surface, to stop the injection, and to re-work and clean the air wall.

Further, the grout can be easily injected into the fill dam by low pressure by removing the clay or cement film formed on the wall surface of the cloth tool during perforation, injection, or casing drawing by radiating the grout in all directions with a plurality of injection holes provided around the injection pipe. It is possible to provide an effect of preventing hydraulic pressure and piping phenomenon.

In addition, the fine clay particles accumulated in the lower part of the cloth tool and the grout are radiated to the inside of the cement particle through a plurality of injection holes provided around the injection pipe, and the fine clay particles accumulated in the lower part of the cloth tool and the inside of the cement particles The grout can be easily injected.

In addition, by forming the injection hole of the injection pipe with the end of the endolerization, it is possible to prevent the clogging of the injection hole and to diffuse the radiated grout so that the grout does not destroy the wall surface of the tool, .

In addition, by forming a plurality of cutout grooves in the circumferential direction outside the injection hole of the injection pipe, clogging of the injection hole is prevented, and the grout to be radiated is diffused so that the grout does not destroy the wall surface of the tool, The effect of removing the formed film can be provided.

Further, by providing the rubber sleeve between the casing and the packer, the leakage of the grout can be further prevented.

Further, by providing a plurality of transversely-oriented concave-convex portions in the rubber sleeve, it is possible to provide an effect that the sealing force is increased and the leakage of the grout is further prevented.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a view showing a porous-spray injecting apparatus for a fill dam according to an example of the present invention. FIG.
Fig. 2 is an enlarged view showing a plurality of transversely oriented concave-convex portions in the rubber sleeve of Fig. 1;
FIG. 3A is a cross-sectional view showing the injection hole of FIG. 1; FIG.
FIG. 3B is a cross-sectional view and a front view showing a cutting groove formed in the injection hole of FIG. 1; FIG.
3C is a cross-sectional view showing another embodiment of the injection hole of FIG.
FIG. 3D is a cross-sectional view and a front view showing that a cutting groove is formed in another embodiment of the injection hole of FIG.
4 is a view showing a grout injection method of a fill dam using a porous injection injection device of a fill dam according to an example of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In the drawings, like reference numerals are used to refer to like elements throughout the drawings, even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the difference that the embodiments of the present invention are not conclusive.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, May be "connected "," coupled "or" connected ".

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the structure of a perforation injection apparatus for a fill dam according to an exemplary embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an enlarged view showing a plurality of transversely opposite convexo-concave portions in the rubber sleeve of FIG. 1. FIG. 3a is an enlarged view of the injection hole of FIG. Fig. 3B is a cross-sectional view and a front view showing a cutting groove formed in the injection hole of Fig. 1, Fig. 3C is a sectional view showing another embodiment of the injection hole of Fig. Sectional view and a front view showing a cutting groove formed in another embodiment.

1, a perforation injection apparatus for a fill dam according to an embodiment of the present invention includes a casing 11 inserted into a cloth tool 1 of a fill dam, a packer 13 for sealing the casing 11, A pipe 17 provided through the pipe 13 and an injection pipe 19 provided at the end of the pipe 17. [

The casing (11) is inserted into the cloth tool (1) formed on the filler dam, and is preferably formed to have the same diameter as the cloth tool (1).

The packer 13 is provided on the front end side of the casing 11 to seal the casing 11 and is formed using a material such as rubber. A separate pipe is connected to the packer 13, and water or air is injected into the pipe to expand it, thereby sealing the inside of the casing 11 to prevent the leakage of the grout 2.

A rubber sleeve 15 may be further provided between the casing 11 and the packer 13 to prevent the leakage of the grout 2 between the casing 11 and the packer 13, (See FIG. 2) may be provided on the side walls 15 to further increase the sealing force to prevent the leakage of the grout 2. The thickness of the concave-convex part 151 is reduced toward the outside as well as curved downward. This is because the thin part is closely attached to the inner wall surface of the casing 11 to completely prevent the leakage of the grout 2.

The pipe 17 is for transporting the grout 2, and is installed through the packer 13, and the injection pipe 19 is connected to the tip end.

The injection pipe 19 is connected to the pipe 17 using a connecting bolt or the like, and a plurality of injection holes 191 are formed around the injection pipe 19. The injection pipe 19 can be used in a suitable length according to the depth of the cloth tool 1 and the injection hole 191 has a different diameter from the diameter of the injection hole 191 according to the site conditions. The upper and lower spacing is about 20 mm, but it can be narrower or wider. The clay or the cemented film formed on the wall surface of the cloth tool 1 is removed by radiating the grout 2 in all directions through the injection hole 191. Accordingly, the grout 2 is prevented from being clogged, It can be easily injected into the cavity. The grout 2 is directly radiated through the injection hole 191 of the injection pipe 19 inside the fine clay particles or the cement particles accumulated on the lower part of the cloth tool 1, The grout (2) penetrates evenly between cracks or gaps located. The pressure at which the grout 2 is injected is determined in consideration of the toe load, the physical properties of the core material, the fluidity of the grout 2, etc., and an excessive injection pressure is applied to the cloth tool 1 formed on the core of the fill- , The hydraulic cracking phenomenon may extend the crack to the top of the fill dam, which may threaten the safety of the fill dam. However, according to the present invention, the grout 2 can be injected at a lower pressure than the prior art by forming a plurality of injection holes 191 around the injection pipe 19, Infiltration injection is possible.

At this time, the injection hole 191 has a constant diameter (see FIG. 3A), and the grout 2 exiting the injection hole 191 is diffused toward the wall surface of the cloth tool 1 while being diffused. In addition, the injection hole 191 may be formed to have a narrow inside and a narrow outside (see FIG. 3C). The outer shape of the outer liner prevents the inflow hole 191 from being clogged by preventing the inflow of sand or stone having a small particle diameter inside the injection hole 191 and prevents the clogging of the inflow hole 191, The grooves 2 are widely diffused again at the moment of exiting the injection hole 191 after being contracted so that the grout 2 removes the film formed on the wall surface without destroying the wall surface of the cloth tool 1. [ 3B and FIG. 3D) so that the sand or the like is caught in the injection hole 191, the injection hole 191 is formed through the cutout groove 193 Sand or the like may be released as the grout 2 is jetted. The grout 2 discharged through the incision groove 193 removes the film formed on the wall surface without destroying the wall surface of the cloth tool 1 as the grooves 193 are expanded in all directions, The grooves 191 may be formed in any one of the injection holes 191 having a constant diameter or the injection hole 191 having a diameter smaller than that of the inner light hole. It is preferable to diffuse the injection hole 2 or prevent clogging of the injection hole 191. [

The material of the grout 2 radiated through the injection hole 191 of the injection pipe 19 is usually selected from Portland cement and micro cement according to the permeability coefficient, saturation degree and cracking state of the core of the fill dam. Microcement is usually one-tenth of fine particles of Portland cement. It is preferable to mix water with microcement to make grout (2). If the mixing ratio of cement to water is 1: 5 or more, the grout (2) can reduce the surplus space after the cement particles have settled properly. The mixing ratio of cement and water is preferably 1: 1 to 1: 4. At this time, as the bleeding rate of the grout (2) increases, the gap and the crack are filled with water as the empty gap increases. Therefore, Na-type bentonite or activated bentonite is mixed with cement to reduce the bleeding and the shrinkage of the grout (2) It is good to do. Bentonite is expanded to about 15 times and used as an additive for infiltration injection. The amount of bentonite should be adjusted within 8% of cement according to the mixing ratio, the condition of the soil under test, the injection pressure, etc., and the Na-type bentonite It is preferable to add 2 to 4% of the cement weight.

The porous spray injection device 10 of the fill dam of the present invention can easily inject the grout 2 by removing the dross formed on the wall surface of the cloth tool 1 by radiating the grout 2 in all directions. Therefore, a phenomenon in which the grout 2 leaks into the ground due to clogging in the cloth tool 1 does not occur, the air delay due to the interruption of the injection of the grout 2 is prevented, and the cleaning of the wall surface of the cloth tool 1 The cost is reduced. Also, the grout 2 can be injected at a lower pressure than that of the prior art, thereby preventing the hydraulic pressure column and the piping phenomenon of the fill dam, and stable infiltration can be performed because the pressure and the injection rate during injection are constant. In addition, the present invention can be used for maintenance and reinforcement of levees and the like in addition to the fill dams where a supersaturated zone exists in the core or leakage and piping occur.

Hereinafter, a grout injection method of a fill dam using a porous injection injection device of a fill dam according to an example of the present invention will be described in detail with reference to the drawings.

4 is a view showing a grout injection method of a fill dam using a porous injection injection device of a fill dam according to an example of the present invention.

Referring to FIG. 4, a grout injection method of a fill dam using a perforation injection device of a fill dam according to an exemplary embodiment of the present invention includes a cloth tool forming step S10, an injection device insertion step S20, a grout injection step S30 , An injector elevating step (S40), a grouting injection step (S30) and an injector elevating step (S40) repeatedly. On the other hand, the configuration of the porous-spray injecting apparatus 10 of the fill dam is described with reference to the above description.

The cloth tool forming step S10 is a step of forming the cloth tool 1 in the fill dam.

The injection device inserting step (S20) is a step of inserting the porous injection injection device (10) of the fill dam into the cloth tool (1). The porous spray injection device 10 of the fill dam includes a casing 11 to be inserted into a cloth tool 1 of a fill dam, a packer 13 to seal the casing 11, a pipe 17 to pass through the packer 13, And an injection pipe 19 provided at an end of the pipe 17. A separate pipe is connected to the packer 13 so that the packer 13 is inflated by water or air injected through the pipe and the expanded packer 13 seals the inside of the casing 11, It is possible to prevent the leakage of the grout 2 between the casing 11 and the packer 13 and to prevent the leakage of the grout 2 between the casing 11 and the packer 13. Further, a rubber sleeve 15 is further provided between the casing 11 and the packer 13, 2) may be prevented from leaking. The pipe 17 and the injection pipe 19 are connected by a screw connection using a connecting bolt and a plurality of injection holes 191 are formed around the injection pipe 19.

The grout injection step S30 is a step of injecting the grout 2 through the pipe 17 so that the grout 2 transferred to the injection pipe 19 through the pipe 17 is injected into the injection hole 19 of the injection pipe 19. [ (191) and injected into the cloth tool (1) of the fill dam. The grout 2 radiated in all directions through the injection hole 191 removes the film formed on the wall surface of the cloth tool 1 and easily penetrates into the pores such as cracks and gaps. The material of the grout 2 is usually selected from Portland cement, micro cement or the like in accordance with the permeability coefficient, saturation degree and cracking state of the core of the fill dam, and it is preferable to mix the micro cement with water to form the grout 2. In this case, the mixing ratio of cement and water is preferably 1: 1 to 1: 4, and it is preferable to mix Na-type bentonite or active bentonite for cement.

The injector elevating step S40 is a step of raising the porous injection injecting apparatus 10 of the fill dam by a predetermined distance. The pouring injection device 10 of the fill dam inserted in the cloth tool 1 is raised to a position higher than the position of the grout 2 injected in the grouting step S30. There is no clogging in the cloth tool 1 when the grout 2 is injected in the grout injection step S30 so that it is not necessary to apply excessive pressure so that the grout 2 is prevented from clogging the wall surface of the cloth tool 1 and the casing 11, it is possible to inject the grout 2 by pulling up the perforation injection device 10 of the fill dam without cleaning the wall of the cloth tool 1 separately.

After the infusion device elevating step S40 is performed, the grouting step S30 and the inflating device elevating step S40 are repeatedly performed to fill the grout 2 to the inlet of the cloth tool 1, Repair, and reinforcement.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. That is, within the scope of the present invention, all the constituent elements may be constituted or operated selectively in combination with one or more. Furthermore, the terms "comprises", "comprising", or "having" described above mean that a component can be implanted unless otherwise specifically stated, But should be construed as including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

1: Cloth tool
2: Grout
10: Perforation injection device of fill dam
11: casing
13: Packer
15: Rubber sleeve
151: concave and convex portion
17: Pipe
19: injection pipe
191: Injection ball
193: incision groove
S10: Cloth tool forming step
S20: Injection device insertion step
S30: Grout injection step
S40: Injection device rising step

Claims (7)

A casing inserted into the cloth tool of the fill dam;
A packer provided at an end of the casing to seal the casing; And
And a pipe passing through the packer and transferring the grout,
Further comprising an injection pipe provided at an end of the pipe,
The injection pipe is provided with a plurality of injection holes around the injection pipe to facilitate injection of the grout by removing the film formed on the wall surface of the cloth tool by radiating the grout in all directions,
Wherein the injection hole has a plurality of cut-out grooves formed in a circumferential direction on an outer side thereof to prevent clogging of the injection hole and to diffuse the radiated grout.
A casing inserted into the cloth tool of the fill dam;
A packer provided at an end of the casing to seal the casing; And
And a pipe passing through the packer and transferring the grout,
Further comprising an injection pipe provided at an end of the pipe,
The injection pipe is provided with a plurality of injection holes around the injection pipe to facilitate injection of the grout by removing the film formed on the wall surface of the cloth tool by radiating the grout in all directions,
Wherein the injection hole is formed by an endowment of the inner light to prevent clogging of the injection hole,
Wherein the injection hole has a plurality of cut-out grooves formed in a circumferential direction on an outer side thereof to prevent clogging of the injection hole and to diffuse the radiated grout.
The method according to claim 1 or 2,
Further comprising a rubber sleeve provided between the casing and the packer.
The method of claim 3,
Wherein the rubber sleeve is provided with a plurality of transverse concavo-convex portions to increase a sealing force.
delete delete A grout injection method of a fill dam using a perforation injection device of a fill dam according to claim 1 or 2,
A cloth tool forming step of forming the cloth tool on the fill dam;
An injection device inserting step of inserting the porous injection injection device of the fill dam into the cloth tool;
A grout injection step of injecting the grout through the pipe;
An injector elevating step of elevating the perforated injection injector of the fill dam by a predetermined distance; And
And repeatedly performing the grout injection step and the injector elevating step.

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