KR102301700B1 - Partial Casing Installation Method - Google Patents

Abstract

The present invention is a method of installing a partial casing of a set standard by excavating to the crushing zone of the ground, a partial casing installation step of installing a partial casing for reinforcing a hollow wall in a set section using a rod of a drilling machine; a field test performing step of performing a field test on the section in which the partial casing is not installed after the partial casing installation step; and a partial casing welding step of welding the partial casing installed through the partial casing installation step.

Description

Partial Casing Installation Method

The present invention relates to a casing installation method, and more particularly, to a partial casing installation method to compensate for the shortcomings, although the grouting method is currently used because the collapse of the borehole wall in the bedrock layer makes it difficult to install the outer casing. .

In various building works or civil works, excavation work is first performed to prepare an installation space for the structure. In such excavation work, continuous walls are installed to prevent the surrounding ground from collapsing into the installation space of the structure to withstand the earth pressure of the surrounding ground. It is common to let

In addition, the continuous wall performs a water blocking function to prevent water flowing through the surrounding ground from flowing into the installation space of the structure in addition to the function of withstanding the earth pressure of the surrounding ground as described above.

A continuous wall is generally made of a continuum of pillar-shaped piles formed by drilling a hole of a certain size in the ground and then filling it with concrete or mortar. is being built

In relation to the construction method of such a continuous wall, a plurality of tubular casings are inserted into the ground to a certain depth and arranged, and such a casing serves as a kind of formwork, so that concrete or mortar is introduced into the casing. A method for forming a continuous wall of a pile continuum by injecting and solidifying a pile-forming material such as

Since it is impossible to see deep underground from the surface of the earth, drilling survey refers to an investigation in which a specific standard bit is mounted on the casing using a drilling machine to excavate the ground (underground).

The purpose of the drilling survey is to investigate the continuous properties of the ground, collect soil samples (disturbed and Buddhist eggs) and rock samples to be used for various indoor tests, and conduct various in situ tests (field tests in boreholes), etc. All data will be provided.

The drilling method is divided into impact-type drilling survey and rotary drilling survey, and rotary drilling survey can be classified into auger boring method, non-boring method, and rotary flush boring method.

The drilling survey in the ground survey enables continuous sample collection (soil and rock core) and uses the no-boring method and the rotary flush boring method to perform in-situ testing in the borehole. use the method

In order to carry out continuous sampling and in-situ testing (standard penetration test, shear test and loading test in the borehole, various physical exploration and physical inspection, etc.) should be preserved as it is.

In general, the strata that appear during excavation in drilling surveys appear from the top in the order of sedimentary layer (reclaimed layer), sedimentary layer, weathered soil layer, weathered rock layer, and bedrock (soft rock, common rock, hard rock, etc.). , gravel, clay, silt, etc.), relative density, softness, water content, etc. do.

For this reason, when the rod and the excavation casing are raised to the upper part after excavating the lower part with the drilling machine, the hollow wall is not maintained for the lower part and tends to collapse. To prevent this, basically, the soft layer (soil layer (reclaimed layer, sediment layer, weathered soil layer) and weathered rock layer) is excavated while installing the outer casing.

The outer casing is a casing with a larger diameter than the excavation casing. After installing the outer casing on the drilling machine, the borehole wall collapse can be prevented by installing it to the depth of weathered rocks with the rotation and pressing force of the drilling machine (sometimes tapping with a hammer).

In the case of the bedrock layer, it is common to maintain the hollow state (the state in which the outer casing or protective PVC is not installed) after excavating with a drilling casing equipped with a diamond bit (generally NX casing, diameter 76mm).

In the case of a general bedrock layer (normal or fresh rock), the collapse of the hollow wall rarely occurs even when the borehole is drilled after excavation. This phenomenon occurs, and the grouting reinforcement method is widely used in the past as the reinforcement method to prevent the collapse of the hollow wall.

In the grouting method, cement suspension is injected into the hole, cured, and then re-excavated and reamed (used for excavation due to the side blade of the bit). Although it is an easy method to prevent cancer from collapsing, there are disadvantages such as occurrence of contamination of the surrounding groundwater by cement, difficulty in securing long-term stability of the pore wall, and blocking the flow of groundwater in the relevant section because the pore wall is coated with cement.

Republic of Korea Patent Registration No. 10-0864110

Therefore, the present invention has been devised to solve the above problems, and the problem to be solved by the present invention is a method of protecting a borehole by inserting a casing in the collapse section, and the end of the casing reaches a good bedrock to prevent further collapse It is to provide a partial casing installation method equipped with a function to prevent.

However, the technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned are clearly to those of ordinary skill in the art to which the present invention belongs from the description below. can be understood

The present invention was created to improve the problems of the prior art as described above, and is a method for installing a partial casing of a set standard by excavating up to the crushing zone of the ground. Partial casing installation step to install; a field test performing step of performing a field test of a section in which the partial casing is not installed after the partial casing installation step; and a partial casing welding step of welding the partial casing installed through the partial casing installation step.

In addition, the partial casing welding step is a partial casing connection step of welding a portion of the partial casing after passing through the partial casing installation step, and connecting the non-welded portion of the partial casing after the partial casing welding step: can be included.

In addition, the load can be released when the partial casing reaches a set position.

In addition, by installing a strainer in the section where the partial casing is in contact with the crusher, it is possible to induce a smooth flow of groundwater.

In addition, the strainer may be manufactured in a point shape or a straight shape.

In addition, in order to fix the partial casing in a set position, it is possible to drill a hole so that the partial casing is hung.

In addition, the non-welded portion of the partial casing may be connected by pressing the connecting member.

According to an embodiment of the present invention, as a method of protecting a borehole by inserting a partial casing in the collapse section of the ground, the end of the partial casing reaches a good bedrock to prevent further collapse, and the protection effect of the borehole is higher than that of the grouting method The contamination of groundwater is low, and there is an effect that it is possible to minimize the effect of groundwater flow during strainer treatment.

However, the effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those of ordinary skill in the art to which the present invention belongs from the following description. will be able

The following drawings attached to this specification illustrate preferred embodiments of the present invention, and serve to further understand the technical spirit of the present invention together with the detailed description of the present invention to be described later, so the present invention is described in such drawings It should not be construed as being limited only to
1 is a flowchart of a partial casing installation method according to an embodiment of the present invention.
2 is a view showing a state in which the partial casing is installed.
3 is a view showing a first embodiment of the partial casing method.
4 is a view showing a second embodiment of the partial casing method.
5 is a view showing a state in which the load is released from the partial casing.
6 is a view showing a first embodiment of the strainer.
7 is a view showing a second embodiment of the strainer.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those of ordinary skill in the art can easily carry out the present invention. However, since the description of the present invention is merely an embodiment for structural or functional description, the scope of the present invention should not be construed as being limited by the embodiment described in the text. That is, since the embodiment may have various modifications and may have various forms, it should be understood that the scope of the present invention includes equivalents capable of realizing the technical idea. In addition, since the object or effect presented in the present invention does not mean that a specific embodiment should include all of them or only such effects, it should not be understood that the scope of the present invention is limited thereby.

The meaning of the terms described in the present invention should be understood as follows.

Terms such as “first” and “second” are for distinguishing one component from another, and the scope of rights should not be limited by these terms. For example, a first component may be termed a second component, and similarly, a second component may also be termed a first component. When a component is referred to as being “connected” to another component, it may be directly connected to the other component, but it should be understood that other components may exist in between. On the other hand, when it is mentioned that a certain element is "directly connected" to another element, it should be understood that the other element does not exist in the middle. Meanwhile, other expressions describing the relationship between elements, that is, “between” and “immediately between” or “neighboring to” and “directly adjacent to”, etc., should be interpreted similarly.

The singular expression is to be understood as including the plural expression unless the context clearly dictates otherwise, and terms such as "comprises" or "have" refer to the described feature, number, step, action, component, part or these It is intended to indicate that a combination exists, and it should be understood that it does not preclude the possibility of the existence or addition of one or more other features or numbers, steps, operations, components, parts, or combinations thereof.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Terms defined in the dictionary should be interpreted as being consistent with the meaning of the context of the related art, and cannot be interpreted as having an ideal or excessively formal meaning unless explicitly defined in the present invention.

Figure 1 is a flowchart of a partial casing installation method according to an embodiment of the present invention, Figure 2 is a view showing a state of installing the partial casing, Figure 3 is a view showing a first embodiment of the partial casing method , Figure 4 is a view showing a second embodiment of the partial casing method, Figure 5 is a view showing a state of releasing the load in the partial casing, Figure 6 is a view showing a first embodiment of the strainer, 7 is a view showing a second embodiment of the strainer.

1 to 7, as a method of installing a partial casing of a set standard by excavating up to the crushing zone of the ground, the present invention provides a partial casing installation step (S100), a field test performing step (S200) and a partial casing A welding step (S300) may be included.

The partial casing installation step (S100) is a step of installing the partial casing 10 for reinforcing the hollow wall in a section set using the rod 30 of the drilling machine 20 .

When a stratum receives a fold or a fault, the rock is crushed and crushed to form a crusher. The crusher is often made of soft clay or rock fragments, and there are many accidents, such as suddenly becoming cumbersome with a large amount of water.

The field test performing step (S200) is a step of performing a field test of the section in which the partial casing 10 is not installed after the partial casing installation step (S100). Specifically, in the field test performing step (S200), the section in which the partial casing 10 is not installed may perform field tests such as physical inspection.

Here, the physical inspection layer is a type of borehole physical exploration method that inserts a sonde into a borehole and measures physical phenomena generated using various artificial transmission sources such as sound waves, electric current, and radioactivity, or measures various physical phenomena that occur naturally. It is a study that analyzes the physical properties of the strata around boreholes or inland waters, geometrical characteristics of the strata, and hydraulic characteristics by processing and interpreting data. Oil and gas storage layer evaluation by measuring borehole diameter change, crack characteristics, speed, electrical resistivity, density, porosity, large autonomy, natural gamma rays, borehole bending, borehole water temperature and electrical conductivity, borehole water flow characteristics, casing condition, etc. , mineral resource survey, groundwater survey, environmental pollution survey, geological survey, geothermal survey, CO2 storage assessment, etc.

The partial casing welding step (S300) is a step of welding the partial casing 10 installed through the partial casing installation step (S100). Specifically, in the partial casing welding step (S300), the entire section of the partial casing 10 is welded, and the fixing and installation of the partial casing 10 does not move downward because it is the end of the expansion hole.

In order to fix the partial casing 10 at a set position, the hole wall can be drilled so that the partial casing 10 is hung.

Therefore, in the case of constructing the partial casing 10 by the above-described construction method, the partial casing 10 must be expanded every time the partial casing 10 is installed.

That is, in order to install (seating, caught on the chin) and fix the partial casing 10 at a desired position, it is necessary to dig more than the existing ball, and the cost of excavation is additionally generated, and the number of reinforcement is up to 4 times. The drilling bore of the drilling rig capable of coring (sample recovery) in the ground survey is 6.5 inches maximum.

In a partial casing installation method according to another embodiment of the present invention, the partial casing welding step (S300) is a partial casing installation step (S100) and then a portion of the partial casing 10 is welded, but the present invention is a partial casing connection step (S400) may be further included.

The partial casing connection step (S400) is a step of connecting the non-welded portion of the partial casing 10 after the partial casing welding step (S300).

Specifically, the partial casing welding step (S300) is to weld a part of the partial casing 10 after going through the partial casing installation step (S100). It is installed and fixed, and there is no limit to the number of times that can be reinforced.

In the partial casing connection step (S400), the non-welded portion of the partial casing 10 may be connected by pressing with the connection member 50 .

In addition, since welding is not welding in the entire section, but only the lower section and not welding the upper section, when the rod 30 and the partial casing 10 are dismantled (separated), the force that opens the partial casing 10, that is, the repulsive force is generated and fixed by itself. can Instead, the connection portion between the partial casing 10 and the drilling machine 20 and the rod 30 may be connected by using a connection tongs, which is a dedicated connection member 50 , since the partial casing is not welded.

Specifically, the installation method including the above-described partial casing connection step (S400) can install and fix the partial casing 10 at a desired position after excavating to the same NX standard without drilling, and there is no limit to the number of times that can be reinforced. Instead, the connection part between the partial casing 10 and the drilling machine 20 and the rod 30 can be connected using a tong tool, which is a dedicated connection member 50 because the partial casing 10 is not welded.

When the partial casing 10 reaches the set position, the rod 30 can be released.

Referring to FIG. 5 , as a specific partial casing installation method, in order to draw only the rod 30 after the partial casing 10 fastened to the rod 30 and reached the reinforcement section is installed, the rod 30 - the partial casing 10 ) a dismantling device is required. Since the connection between the rod 30 and the rod 30 is fastened with a right-hand thread, when the rod 30-partial casing 10 is also fastened with a right-hand thread, the rod is rotated counterclockwise to rotate the rod 30 and the partial casing 10. ) When attempting to dismantle, the rod 30 in the middle of the drilling rig 20 - the rod 30 is concerned about dismantling. Accordingly, by using the coupler 60 fastened to the upper rod 30 with a right-hand thread and the lower partial casing 10 with a left-hand thread, the rod 30 is rotated clockwise to connect the coupler 60 and the reinforcing partial casing. When the coupling of (10) is disengaged, only the rod (30) (including the coupler (60)) can be drawn out. In addition, by installing the camera 70 in the partial casing 10, it is possible to monitor the construction status or the ground condition.

In the partial casing installation method according to an embodiment of the present invention, a strainer 40 is installed in a section where the partial casing 10 is in contact with the crusher to induce a smooth flow of groundwater.

Specifically, in order to facilitate the flow of groundwater in the fracture zone that requires reinforcement as a treatment method for the partial casing 10 and the strainer 40, it is necessary to install a strainer 40 (strainer) on the outer peripheral surface of the partial casing, and the strainer 40 ) according to the shape of the partial casing (10) can be reviewed and the aspect of work efficiency.

Here, the strainer is a filter whose cylinder top is made of a metal mesh, and is installed in the pipe and prevents sand, rust, metal waste, etc. from entering into each device.

The strainer 40 may be manufactured in a point shape or a straight shape.

The device or equipment applied to the partial casing installation method according to an embodiment of the present invention includes a coupler, a stainless partial casing, and dedicated tongs.

The coupler 60 is an intermediate member that enables the connection between the rod 30 and the partial casing 10 of the drilling machine 20 . The stainless partial casing 10 is first, in one embodiment, all welding, the strainer 40 can be applied. The fixation may be of a type that is installed and installed in a section with a small diameter by means of expansion.

In another embodiment, the stainless partial casing 10 is welded only to the lower end, and the strainer 40 is applied. It can be fixed in place by the reaction force that is about to unfold. It is also possible to make a spike between the strainers 40 .

In the case of the above-described partial casing 10, the dedicated tongs, which are the connecting members 50, are welded on the lower part but not welded on the upper part, so it is necessary to roll up the casing for connection.

According to an embodiment of the present invention, as a method of protecting a borehole by inserting a partial casing 10 in the collapse section of the ground, the end of the partial casing 10 reaches a good bedrock to prevent further collapse, and is better than the grouting method. The protection effect of the borehole is high, the contamination of the groundwater is low, and the effect of the groundwater flow can be minimized when the strainer 40 is treated.

The detailed description of the preferred embodiments of the present invention disclosed as described above is provided to enable any person skilled in the art to make and practice the present invention. Although the above has been described with reference to preferred embodiments of the present invention, it will be understood by those skilled in the art that various modifications and changes can be made to the present invention without departing from the scope of the present invention. For example, a person skilled in the art may use each configuration described in the above-described embodiments in a way that is combined with each other. Accordingly, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

The present invention may be embodied in other specific forms without departing from the spirit and essential characteristics of the present invention. Accordingly, the above detailed description should not be construed as restrictive in all respects but as exemplary. The scope of the present invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the present invention are included in the scope of the present invention. The present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. In addition, claims that are not explicitly cited in the claims may be combined to form an embodiment, or may be included as new claims by amendment after filing.

10: partial casing
20 : drilling
30: load
40: strainer
50: connection member
60: coupler
70: camera

Claims (7)

A method of excavating to the crushing zone of the ground and installing a partial casing of a set standard,
A partial casing installation step of installing a partial casing for reinforcing the hollow wall in a section set using the rod of the drilling machine;
a field test performing step of performing a field test of a section in which the partial casing is not installed after the partial casing installation step; and
A partial casing welding step of welding the partial casing installed through the partial casing installation step;
In the partial casing installation step,
When the partial casing reaches the set position, dismantle the rod,
and a coupler positioned between the rod and the partial casing and fastened to the rod and the partial casing with different screws,
Partial casing installation method, characterized in that by disassembling the coupling of the coupler and the partial casing to dismantle the rod.
The method according to claim 1,
In the partial casing welding step, a part of the partial casing is welded after passing through the partial casing installation step,
Partial casing installation method, characterized in that it further comprises: a partial casing connecting step of connecting the non-welded portion of the partial casing after the partial casing welding step.
The method according to claim 1,
In the partial casing installation step,
Partial casing installation method, characterized in that by installing a camera on the partial casing, it is possible to monitor the construction status or the ground condition.
The method according to claim 1,
In the partial casing installation step,
Partial casing installation method, characterized in that by installing a strainer on the outer circumferential surface of the partial casing to induce smooth flow of groundwater.
5. The method according to claim 4,
Partial casing installation method, characterized in that the strainer is produced in a point shape or a straight shape.
The method according to claim 1,
In the partial casing installation step,
Partial casing installation method, characterized in that the hole is drilled so that the partial casing is caught in order to fix the partial casing in a set position.
3. The method according to claim 2,
In the partial casing connection step,
Partial casing installation method, characterized in that the connection by pressing the non-welded portion of the casing with a connecting member.

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