KR100334451B1 - Grouting method and the same pipe for undeground well - Google Patents

Abstract

PURPOSE: A grouting pipe for a deep underground water well and a grouting method are provided to improve the reliability of grouting by deeply inserting a grouting pipe and to prevent the contamination of the underground water by completely closing the gap between incasings and the inner wall of an excavated hole. CONSTITUTION: Incasings(52) have corrugated pipes(52a) and ball bearings(53) installed at a specific interval. Expansion tubes(56) close the gap between the incasings and an excavated hole. The incasings are inserted to a desired support without being stopped in the excavated hole even when the excavated hole is curved. According to the expansion tubes, the gap between the incasings and the inner wall of the excavated hole is closed completely.

Description

Grouting pipe device and grouting method for groundwater deep well {Grouting method and the same pipe for undeground well}

The present invention relates to a groundwater core grouting pipe apparatus and a grouting method for curing concrete in the inner wall of the core to prevent the inflow of surface water, etc., into the core excavated in the underground to collect ground water. Grouting pipe device and grounding method for groundwater deepwater well that can prevent the inflow of contaminated surface water into the groundwater because it can be inserted and installed to the required depth when grouting to the well will be.

As industrialization progresses in modern times, environmental pollution is intensifying and interest in clean drinking water is increasing. Therefore, in recent years, researches on devices for purifying tap water or surface water and devices for developing uncontaminated groundwater have been intensified.

In general, the preferred groundwater harvesting device is installed to prevent the collapse of the weathered rock layer 10 to excavate the weathered rock layer 10 to the rock layer 11 using a rocker of a predetermined thickness as shown in Figure 1 Large diameter out casing 1 and the out casing 1 are excavated and then excavated until the rock bed layer 11 penetrates the water vein of the groundwater 13 and is installed to prevent the inflow of surface water 12. And the casing (2) and the strainer (strainer) pipe (3) which is installed to prevent the inflow of soil or foreign matter of the ground water 13 in the position where the ground water 13 is moved to the lower part of the casing (2) and In order to prevent inflow of foreign substances such as surface water 12 into the space between the encasing 2 and the groundwater core well inner wall, the cured concrete 4 and the heart pump installed inside the casing 2 include: 5), and even if connected to the heart pump (5) Is composed of yangsuyong pipe 4 is installed and a mobile ground water 13 is being pumped by the heart pump 5.

The cardiac well pump 5 is heat-set by the upper level sensor 7 and the lower level sensor 8 provided in the pumping pipe 4.

In addition, the encasing (2) is provided with a water level monitoring rod that can monitor the level of the groundwater to a certain depth.

Conventionally, in order to meet a contracted amount by collecting a large amount of groundwater, the insertion depth of the out casing 1, which is to be pushed up to a part of the rock layer 11, is often not only pushed to the middle of the weathered rock layer 11, but even out casing. In some cases, a perforation was formed in (1) to deliberately induce surface water (12) .In case of grouting (2), not only a large number of groundwater cores have been constructed, but also some casings In the case where the heart well (2) is embedded, the grouting construction to prevent the inflow of the surface water 12 has not been carried out, so that the surface water 12 flows into the ground water well without any obstacles to spread the contamination of the ground water 13. Has occurred a lot.

In addition, the most conventional method is to simply drive the encasing (2) without grouting the existing groundwater wells. This inevitably limits the depth at which the incasing 2 is impregnated and essentially prevents contamination due to the inflow of surface water 12.

In addition, the conventional method as a grouting construction method for preventing the inflow of surface water, the excavation of the large diameter that can be inserted into the outer casing (11) to the upper surface of the rock layer 11 in the process of excavation to pump the groundwater (13) Then, after inserting the out casing (1), the concrete (4) is injected into the interior of the curing, and excavation hole of a small diameter for drilling the in casing (2) again until reaching the groundwater (13) vein Then, the method of installing the encasing (2).

However, in this method, grouting must be carried out in a state where the amount of water is not accurately confirmed. Therefore, the initial drilling cost is excessively increased, and when the contract amount of water cannot be secured, the grouting is completed and the existing casing is embedded in the encasing (2) As the waste air treatment has to be disposed, there is a problem in that it is uneconomical in terms of cost of the contractor and consequently incurred excessive construction cost in terms of the client.

And, in order to solve the above problems, excavation to the beginning of the rock layer (11), and then insert the outcasing (1) and then replace the excavation bit (bit) with a small diameter to replace the casing (2) In the state of excavation to the water vein of the groundwater 13 so as to drive the in casing (2), and the concrete (4) is injected into the gap between the casing (2) and the inner wall of the excavation hole to cure the surface water (12) There is a way to block inflows.

However, this method is also difficult to inject the concrete (4) from the bottom in the process of injecting the concrete (4), even if it is injected from the bottom to completely block the gap between the casing (2) and the inner wall of the excavation hole Due to the inability to prevent the concrete 4 from leaking into the groundwater core, the groundwater 13 cannot be contaminated. In addition, even when the concrete (4) is injected from the top, in the gap between the casing (2) and the inner wall of the groundwater core as narrow as 50 ~ 60mm due to the nature of the concrete (4) due to the jamming phenomenon called bridge phenomenon at a medium depth The concrete 4 is not completely filled and the grouting effect cannot be exerted properly, and the concrete 4 is infused with the in casing 2 by injecting the concrete 4 while the level of the groundwater 13 is raised. Mixing and diluting with the groundwater 13 existing between the inner wall of the groundwater core, it is difficult to cure the concrete 4 or to obtain an adequate strength. Therefore, when water quality is important, there is a problem in that enormous additional construction cost is required by reconstructing the grouting as the secondary tertiary.

After the proper amount of groundwater 13 has been checked, another method of constructing grouting is to remove sand from the bottom from the depth at which the veins of the groundwater 13 are identified to a predetermined height in the rock layer 11 of the previously excavated groundwater core. Filling, shielding with mud lumps or wooden boards to keep the shielding in water, and then injecting and curing the concrete 4 from the upper part, and then excavating to the position of the mud lumps or wood boards as described above, The sand is discharged to the outside through a surging cleaning process in which compressed air is blown, and the encasing (2) is driven.

However, this method is also impossible to use if the center of gravity with the excavated drilling hole is not available, and development loss occurs. If the material installed for the shielding does not perform its role properly, the concrete to the groundwater (13) veins (4) is injected because the water vein is blocked, there is a problem that the amount of water is drastically reduced.

And, even if there exists a method of overcoming the above-mentioned problem, the method according to the prior art, when excavating the excavation hole by using a landing gear, to reach the rock layer layer 11 of the components of the rock layer 11 Due to the difference, the excavation hole is made to be curved to some extent, so that it is not possible to maintain a straight axis, and thus, the straight casing 2 does not get stuck to the required depth, so that grouting is not properly performed.

In addition, in the grouting method according to the related art, since the airtight reliability of the shielding means for shielding the concrete 4 is not secured when grouting, the concrete flows to the water vein of the groundwater 4 and contaminates the groundwater 13 or the groundwater 13. There is a problem that the amount of water is reduced.

The present invention has been made to solve the above problems of the prior art, the groundwater heart grouting grouting pipe device and grouting method that can be carried out more easily, surely and economically to block the surface water after the excavation of groundwater heart wells The purpose is to provide.

1 is a schematic cross-sectional view of a general groundwater collection device,

2 is a schematic cross-sectional view of the grouting pipe apparatus according to the present invention;

3 is a partial cross-sectional view of the encasing of the first embodiment according to the present invention;

4 is a schematic cross-sectional view in which a straight pipe is installed in the first embodiment according to the present invention;

5 is a perspective view showing a blade and a guide which are some components of the first embodiment according to the present invention;

6 is a front view of an encasing component of the present invention;

Fig. 7 is a partial sectional view of the encasing of the second embodiment according to the present invention.

<Explanation of symbols on main parts of the drawings>

DESCRIPTION OF SYMBOLS 51 Out casing 52, 91 Encasing 52a, 91a Corrugated pipe 52b Reduced diameter part 53 Ball bearing 54 Strainer pipe 55 Cardiac pump 55a Pumping pipe 56, 94 Expansion tube 57, 95 Rubber band 58 : Hose for compressed air 59: Soft cover plate 60: Flexible tube 60 ': Straight tube 61, 61': Blade 62, 62 ': Guide 63, 63': Pull string 64: Upper level sensor 65: Lower level sensor 66: water level monitoring rod 92: shielding pipe 93: upper protective disk 93 ': lower protective disk

The present invention provides a ground water core grouting pipe apparatus for making a shielding wall installed in the excavation hole to prevent the inflow of surface water contaminated in the ground water core,

The grouting pipe device includes an encasing in which corrugated pipes are formed at predetermined lengths so that the grouting pipe can be inserted along a curved excavation hole, and a gap between the inner wall of the excavation hole and the encasing portion is reduced in a reduced diameter formed at a lower portion of the encasing. Characterized in that it comprises an expansion tube is installed to be.

Here, the encasing is characterized in that the lower end of the ball bearing is installed to guide the insertion of the encasing is easy.

In addition, in the groundwater core heart grouting method for making a shielding wall installed in the excavation hole to prevent the inflow of surface water contaminated in the groundwater core well,

The first process of excavating a large diameter excavation hole to a predetermined depth of the weathered rock layer and the rock bed layer, and installing the outcasing, and excavating a small diameter excavation hole to the groundwater vein of the rock layer to install an in casing having a smaller diameter than the out casing. And a third process of shielding between the outer circumference of the lower end of the encasing portion and the inner wall of the excavation hole with a shielding means and supplying and curing the grouting liquid from the lower portion.

Here, the third process is characterized by injecting and curing a predetermined amount of fast-hard cement or quick-hard two-component mixture urethane-based resin to reduce the pressure applied to the shielding means, and then injecting the remaining grouting liquid .

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

First, the referenced drawings, Figure 2 is a schematic cross-sectional view of the grouting pipe device according to the present invention, Figure 3 is a partial cross-sectional view of the encasing of the first embodiment according to the present invention, Figure 4 is a first embodiment according to the present invention 5 is a schematic cross-sectional view in which a straight pipe is installed, and FIG. 5 is a perspective view showing a blade and a guide which are some components of the first embodiment according to the present invention, and FIG. 7 is a partial cross-sectional view of the encasing of the second embodiment according to the present invention.

The first embodiment of the groundwater harvesting device employing the groundwater core grouting pipe device according to the present invention is installed through a portion of the weathered rock layer 70 and the rock layer 80 from the surface as shown in Figs. It is installed and curved near the groundwater 81 so that the contaminated surface water 71 does not flow in the interior of the excavation hole formed through the casing 51 and the weathered rock layer 70 and the rock layer 80 so that the contaminated surface water 71 does not flow. Encasing 52 formed with a corrugated pipe 52a every predetermined length so as to be inserted into the drilled hole well, a ball bearing 53 installed at a predetermined distance from the lower end of the casing 52, and the encasing 52 A strainer pipe 54 and a groundwater 81 are pumped to form a corrugated pipe 54a at a predetermined length so that the foreign material of the groundwater 81 is filtered at the lower part of the bottom and installed in a curved excavation hole. Ha The heart pump 55 installed in the interior of the encasing 52, the pumping pipe 55a connected to the heart pump 55 so that the ground water 81 is moved to the ground, and the encasing 52 The expansion tube 56 seated around the outer diameter of the reduced diameter portion 52b formed in the expanded tube 56, and the expansion tube 56 is reduced diameter portion 52b of the encasing 52 before the expansion tube 56 is expanded. A rubber band 57 installed around the outer circumference of the expansion tube 56 so that the expansion tube 56 is uniformly expanded when the expansion tube 56 is inflated to maintain a state seated thereon; The compressed air injection hose 58 connected to the expansion tube 56 from the ground through the inside of the casing 52 to supply the compressed air to the expansion tube 56, and the expansion tube 56 of the expansion tube 56. Installed at the top to protect the expansion tube 56 from concrete Is a flexible tube installed between the gap between the casing 52 and the excavation hole from the ground so that concrete is injected into the gap between the soft cover plate 59 and the casing 52 and the excavation hole. It consists of 60.

Here, a blade 61 for cutting the compressed air injection hose 58 is installed in the reduced diameter portion 52b of the encasing 52 under the compressed air injection hose 58. When the blade 61 moves upward to cut the compressed air injection hose 58, a guide 62 for guiding the compressed air injection hose 58 to be well cut is provided in the casing 52. The jaw 52c is fixed to an inner wall of the compressed air injection pipe 58 so that the compressed air injection pipe 58 can be cut by the blade 61. 52, and a pull string 63 for moving the blade 61 upward is connected to the ground at the upper portion of the blade 61. In addition, as shown in FIG. 6, the ball bearing 53 is installed at the outer circumference of the encasing 52 such that a part of the ball bearing 53 protrudes but the ball bearing 53 does not come out. .

In addition, an upper level sensor 64 and a lower level sensor 65 are provided at a predetermined position of the pumping pipe 55a so that the ground water 81 can be collected after filling up to a predetermined position. The water level monitoring rod 66 is provided.

In the construction method using the groundwater grouting pipe apparatus according to the present invention configured as described above, first, a part of the weathered rock layer 70 and the rock layer 80 is excavated using a large-diameter excavation bit, and an inner wall of the excavation hole The out casing 51 is installed to prevent the burial of the excavation hole and the inflow of the contaminated surface water 71.

When the installation of the outcasing 51 is completed, the excavation bit is replaced with a bit with a small diameter, and excavated to a position passing through the groundwater 81.

Thereafter, the strainer pipe 54 is inserted to be installed where the groundwater 81 flows, and the encasing 52 is inserted to the upper portion of the strainer pipe 54.

In this case, since the ball bearing 53 is installed at the lower end of the casing 52, when the encasing 52 is inserted into the excavation hole, the encasing 52 is excavated even when the excavation hole is curved. The inner casing is well inserted without scratching or hanging, and the encasing 52 maintains a constant gap with the inner wall of the excavation hole by the ball bearings 53 installed at predetermined lengths.

When the encasing 52 is well installed, compressed air is injected into the expansion tube 56 installed in the reduced diameter portion 52b of the encasing 52 through the compressed air injection hose 58. In this case, the expansion tube 56 is uniformly inflated by the rubber band 57 to serve as a shield plate. When compressed air is injected into the expansion tube 56 and the gap between the encasing 52 and the inner wall of the excavation hole is shielded, concrete fluid is injected through the flexible tube 60.

Here, as shown in FIG. 5, the flexible tube 60 is replaced with a general straight tube 60 'when the gap between the casing 52 and the excavation hole is narrow. Like the above), the casing 52 is installed to be connected to the upper part of the soft cover plate 59, and the lower part of the connection part is connected to the blade 61 'and the blade 61' connected to the pull string (63 ') The guide 62 'for guiding the movement of the 61' is installed on the inner wall of the encasing 52 in which the jaw 52d is formed so that the guide 62 'can be cut after the curing of the concrete is finished.

At this time, the concrete liquid is sequentially injected from the upper portion of the flexible cover plate 59 by the flexible tube 60 or the straight tube 60 'and thus exists in the gap between the encasing 52 and the excavation hole. Is injected while pushing up the contaminated surface water (71), do not mix with contaminated surface water (71), because the bridge phenomenon that less concrete fluid is filled, curing is properly performed. In addition, since the soft cover plate 57 is installed on the upper portion of the expansion tube 56, the expansion tube 56 may be prevented from being damaged by the injection of the concrete liquid.

When the concrete solution is injected into the gap between the encasing 52 and the inner wall of the excavation hole and the curing is completed, the pull line 63 is pulled to cut the compressed air injection hose 58. In addition, when the straight tube 60 'is installed inside the casing 52, the pull tube 63' is pulled to cut the straight tube 60 '. Then, the compressed air injection hose 58 and the straight tube 60 'are collected from the inside of the casing 52.

As described above, when the construction is completed, the pumping pipe 55a and the heart pump 55 are installed inside the encasing 52 to complete the work, and the groundwater 81 is pumped.

On the other hand, according to the second embodiment of the present invention, as shown in Figure 7, the contaminated surface water 71 and the excavation of the weathered rock layer 70 to a certain depth of the rock layer 80 does not penetrate into the inner wall of the drilling hole and Similarly, the excavation is performed using a large diameter bit, and then the excavation is carried out up to the water vein of the groundwater 81 using the small diameter bit, and then the encasing 91 having the corrugated pipe 91a is installed.

Here, a shielding pipe 92 having a predetermined length having a diameter larger than that of the encasing 91 is provided at a lower end of the encasing 91, and an upper portion having a larger diameter than the shielding pipe 92 is provided at upper and lower portions thereof. A protective disc 93 and a lower protective disc 93 'are provided, and an expansion tube 94 is provided on the outer circumference of the shielding pipe 92. Here, the expansion tube 94 is the upper protective disk 93 and the lower protective disk 93 is installed in the upper and lower portions of the shielding pipe 92 so that the casing pipe 91 is not damaged when inserted into the drilling hole. Protected by '). In addition, a ball bearing 53 is installed at an outer circumference of the lower protection disc 93 'to serve as a guide when the encasing 91 is inserted.

In addition, a flexible cover plate 59 is provided between the upper protective disk 93 and the expansion tube 94 as in the first embodiment, and the expansion tube 94 is disposed outside the expansion tube 94. ) And a rubber band 95 is installed so that the expansion occurs uniformly.

Of course, as in the case of the first embodiment, the compressed air injection hose 58 for injecting compressed air into the expansion tube 94 is connected to the expansion tube 94 through the inside of the casing 91. The flexible tube 60 can be easily installed between the in casing 91 and the inner wall of the excavation hole because the gap between the encasing 91 and the inner wall of the excavation hole is excavated with a large diameter is wide.

In addition, by installing a plurality of the compressed air injection hose 58 and the flexible tube 60 can be carried out smoothly and quickly.

That is, first, the weathered rock layer 70 and the rock layer 80 are excavated to a depth such that the contaminated surface water 71 does not flow using a bit of a large diameter, and then penetrates the water vein of the groundwater 81 from the position. After excavation using a small-diameter bit, a strainer pipe 54 is installed near the water vein of the groundwater 81, and an encasing 91 equipped with a shielding pipe 92 or the like for shielding is mounted on the lower portion. When the protective disk 93 'is inserted to the depth of the lower end of the excavation hole excavated with a large diameter, and then injected compressed air into the expansion tube 94 through the compressed air injection hose 58, the expansion tube The 94 is inflated to completely shield the upper and lower portions.

At this time, the gap between the shielding pipe 92 and the inner wall of the excavation hole excavated with a large diameter bit is very narrow so that the expansion rate of the expansion tube 94 is small, so that the expansion tube 94 may be damaged during expansion. Is less, the load on the expansion tube 94 is reduced because the load of the concrete is dispersed by the upper protective disk 93 when injecting the concrete liquid through the flexible tube 60, the expansion tube 94 Can be secured. In addition, the concrete wall being cured between the casing 91 and the excavation hole is thickened to achieve a perfect shielding effect.

Thereafter, the concrete liquid is injected through the flexible tube 60, and when the concrete is completely cured, the compressed air injection hose 63 caught on the jaw 52c is pulled out by pulling the pull string 63. To be cut by (61).

Here, the preferred method of curing by injecting the concrete liquid, firstly a certain amount of fast-hard cement or quick-hard two-component mixed urethane-based resin is first injected to just below the flexible tube 60, and then the injected cement is After curing, the remaining cement is injected and cured.

That is, since a certain amount of cement is injected and cured from the upper end of the expansion tube 94 to a predetermined height, the pressure applied to the expansion tube 94 is reduced compared to the case where all the cement is injected and cured at once.

When the grouting is completed as described above, the pumping pipe 55a and the cardiac pump 55 are inserted into the casing 91 to start collecting groundwater 81.

As described above, in the ground water core grouting pipe apparatus and the grouting method according to the present invention, the incasing 52 and 91 can be inserted to the required depth without being caught inside the excavation hole even when the excavation hole is curved, thereby improving the reliability of grouting. In addition, complete shielding is achieved by the expansion tubes 56 and 94, thereby providing an effect of performing perfect grouting without contaminating the groundwater 81 or blocking the water veins of the groundwater 81.

Claims (12)

In the ground water core grouting pipe device for making a shielding wall installed in the excavation hole to prevent the inflow of surface water contaminated with the ground water core, The grouting pipe device includes a tubular encasing inserted into the groundwater core with a predetermined gap with the excavation hole to inject grouting liquid into the excavation hole inner wall, Groundwater comprising an expansion tube that expands when compressed fluid is injected to shield the gap between the inner wall of the excavation hole and the encasing to prevent leakage of the grouting liquid upon injection of the grouting liquid Grouting pipe device for the heart well. The method of claim 1, The encasing is a corrugated pipe formed at a predetermined length so that the casing can be inserted along a curved excavation hole, and at the lower end, a grouting pipe device for groundwater deep heart growth, characterized in that a reduced diameter portion is formed with a reduced diameter so that the expansion tube is installed. . The method of claim 1, Wherein the casing is a corrugated pipe is formed at a predetermined length so that it can be inserted along the curved excavation hole, and the outer surface of the lower portion of the ground grout pipe grouting device characterized in that the shielding pipe is installed so that the expansion tube is installed. The method according to any one of claims 1 to 3, The encasing is ground water deep grouting pipe apparatus, characterized in that the ball bearing is installed at the lower end of the guide to facilitate the insertion of the casing. The method according to any one of claims 1 to 3, Grouting liquid supply tube 60 is installed to supply grouting liquid between the casing 52 and the excavation hole, and inside the casing 52 to supply compressed air to the expansion tube 60. The compressed air injection hose 58 connected to the expansion tube 56 through the protective tube 56 and the expansion tube 56 at the outer circumference of the expansion tube 56 while the expansion tube 56 is uniformly Grounding water grouting pipe device, characterized in that it comprises a rubber band (57) that is installed to be expanded. The method of claim 5, The grouting liquid supply tube is a grounding water grouting pipe apparatus, characterized in that the tube is formed with a corrugated tube to be inserted in the curved portion. The method of claim 5, The compressed air injection hose is provided with a cutting means at the bottom to cut the compressed air injection hose 58, the guide for guiding the movement of the cutting means is installed on the inner wall of the casing (52) Groundwater core grouting pipe device, characterized in that. The method of claim 5, The grouting fluid supply tube is connected to the ground through the inside of the casing (52) to supply grouting liquid between the casing (52) and the inner wall of the drilling hole. The method according to any one of claims 1 to 3, The encasing is characterized in that it comprises a plurality of holes formed in the lower portion to filter foreign matter in the ground water, the strainer pipe formed with a corrugated pipe (54a) every predetermined length so that it can be installed in a curved excavation hole Grouting pipe device for groundwater deep well. The method according to any one of claims 1 to 3, The expansion tube is ground grout pipe device for the groundwater heart characterized in that the soft cover plate (57) is installed to protect the expansion tube from damage when the grouting liquid is supplied thereon. In the groundwater core grouting method for making a shielding wall installed in the excavation hole to prevent the inflow of surface water contaminated with groundwater core, The first process of excavating a large diameter excavation hole to a predetermined depth of the weathered rock layer and the rock bed layer, and installing the outcasing, and excavating a small diameter excavation hole to the groundwater vein of the rock layer to install an in casing having a smaller diameter than the out casing. And a third step of shielding between the outer circumference of the lower end of the encasing portion and the inner wall of the excavation hole with shielding means and supplying the grouting liquid from the lower portion to cure it; The third step is ground water heart grouting method, characterized in that the hardening by injecting and curing a certain amount of hard cement or a quick lyotropic liquid mixture to reduce the pressure applied to the shielding means, injecting the grouting liquid. The method of claim 5, The grouting liquid supply tube is a blade is installed on the lower side to cut the grouting liquid supply tube when the supply of grouting liquid is completed, the guide for guiding the movement of the blade is installed on the inner wall of the encasing Grouting pipe device for groundwater deep well.