KR102233572B1 - Inverse casing for perforating ground bore and inverse casing manufacturing method thereof - Google Patents

Abstract

According to an embodiment of the present invention, provided is a reverse casing for ground perforation, which comprises: a casing pipe part having a reverse casing groove in the longitudinal direction of a pipe so as to accurately and efficiently perform the post-ground perforation operation when a pre-ground perforation is formed in the ground, and then, a post-ground perforation is formed by overlapping the pre-ground perforation; and a reverse casing pipe part formed by bonding an arc-shaped plate member to the reverse casing groove so that a convex surface faces inward of the pipe.

Description

Inverted casing and reverse casing manufacturing method for ground drilling {INVERSE CASING FOR PERFORATING GROUND BORE AND INVERSE CASING MANUFACTURING METHOD THEREOF}

The present invention relates to a casing for ground drilling, and more particularly, in the case of forming a later ground drilling by overlapping with a pre-ground drilling formed in the ground first, a ground fabric that enables the subsequent ground drilling operation to be accurately and efficiently performed. It relates to a common reverse casing and a method of manufacturing the reverse casing.

The wall steel pipe pile and the "rectangular square pipe" disclosed in Patent Application No. 10-2018-01278445, which is the first application of the applicant of the present application, are used to provide pile foundations and temporary barriers (order walls) on soft ground with deep water or deep coastal areas. It is mainly used for construction at the same time. In addition, these wall steel pipe piles are also used in offshore construction projects such as bridges, roads, and railroads in which vertical and lateral loads work together.

Temporary barriers or soil barriers using these wall steel pipe piles or “rectangular square pipes on the sides” are connected to the wall steel pipes and sheet piles after forming a ground perforation using a perforation equipment along the circumferential area of the installation area. The ordering method of completing the ordering wall, the SPSP (Steel Pipe Sheet Piles) ordering method, which combines the fasteners and inserts a non-shrinkable mortar to connect the wall steel pipes, forming columns after drilling or driving a wall steel pipe into the ground drilling. It is installed using a variety of orders such as method or earth protection methods.

1 is a view schematically showing a water ground drilling process for forming a temporary barrier in water in the prior art described above.

In the ground drilling process for installing the temporary barrier, as shown in Fig. 1(a), after placing the casing 10 such as a steel pipe-type wall steel pipe at the ground drilling position to the upper area of the rock layer (e.g., the upper part of the weathered rock layer, etc.) , Ground drilling (15, see Fig. 1 (b)) is formed by inserting the drilling drill 13 of the drilling equipment into the casing 10 to perform drilling. In this process, the casing 10 maintains the direction of the ground perforation.

During the above-described ground drilling, when the drilling drill 13 passes through a soil layer such as a shelf layer and reaches a rock layer including weathered rock, soft rock, or hard rock, it is drilled to break the rock layer and perform a ground drilling. After forming a ground perforation 15 having a target depth as shown in (b) of 1, the casing 10 is taken out. Thereafter, the casing 10 and the drilling drill 13 are moved to a position adjacent to the formed ground drilling 15, and the above-described ground drilling process is repeatedly performed while overlapping the previously formed ground drilling 15 and a certain area. By doing so, ground perforations are formed.

However, in the case of the above-described conventional ground drilling construction process, in the case of performing a ground drilling operation for forming an additional ground drilling by overlapping a predetermined area with the previously formed ground drilling 15, the lateral external force due to the drilling operation or the rock mass The position of the casing 10 or the perforation drill may be moved in the lateral direction due to the repulsive force, etc., in this case, the ground perforation formed later is not formed in parallel with the first-formed ground perforation 15 because it does not have the desired verticality. It can be misaligned. In addition, the crushed rock 13, which is crushed during the drilling or driving of the rock layer, is introduced into the region of the pre-formed ground drilling 15, making it difficult to perform a subsequent process.

That is, in the case of performing the later ground drilling by overlapping the ground drilling 15 first drilled in a certain area, a means for supporting the newly penetrated casing 10 from the lateral external force is not provided, thus securing the verticality There is still a difficult problem.

Korean Patent Registration No. 10-0923078 Korean Patent Registration No. 10-0496619

Accordingly, one embodiment of the present invention for solving the problems of the prior art described above is, in the case of forming a ground perforation after forming a pre-ground perforation in the ground and then overlapping with the pre-ground perforation to form a post perforation, a ground perforation process by supporting the casing. By keeping the direction of the ground drilling constant during the process, the post-ground drilling work can be performed accurately and efficiently, so that the verticality of the ground drilling can be maintained. It is an object to be solved to provide a back casing for ground drilling and a back casing manufacturing method that blocks the inflow so that the post-process can be easily performed.

An embodiment of the present invention for achieving the above-described problem of the present invention, a casing pipe portion having an inverted casing groove along the longitudinal direction of the pipe; And an inverted casing pipe portion formed by joining an arc-shaped plate member to the inverted casing groove so that the convex surface faces the inside of the tube.

The reverse casing pipe portion is characterized in that the circular arc-shaped plate member cut to form the reverse casing groove of the pipe is formed by being joined to the reverse casing groove so that the convex surface faces the inside of the pipe.

The reverse casing pipe portion is characterized in that it is formed of an arc-shaped plate-shaped member having a radius of curvature equal to the radius of curvature of the casing pipe portion.

The reverse casing pipe portion is characterized in that it is formed of an arc-shaped plate-shaped member having a radius of curvature smaller than the radius of curvature of the casing pipe portion.

The reverse casing pipe portion is characterized in that it is formed of an arc-shaped plate-shaped member having a radius of curvature greater than the radius of curvature of the casing pipe portion.

The arc-shaped plate member forming the casing pipe portion and the reverse casing pipe portion is characterized in that it is manufactured by any one of rolling, bending, press forming, or casting processes.

An embodiment of the present invention for achieving the above-described problem of the present invention, a casing pipe portion forming step of forming a casing pipe portion having an inverted casing groove along the longitudinal direction of the pipe; And forming an inverted casing tube portion by joining an arc-shaped plate member concavely inwardly of the tube to the inverted casing groove to form an inverted casing tube portion; Provides a common reverse casing manufacturing method.

The casing pipe part forming step is characterized in that the casing pipe part is formed by cutting a part of the pipe corresponding to the reverse casing groove along a length direction.

The step of forming the casing pipe portion is characterized in that the step of forming the casing pipe portion by any one of rolling, bending, press forming, or casting process.

In the forming of the reverse casing pipe part, an arc-shaped plate member formed by cutting a part of the pipe serving as the reverse casing groove along the length direction is joined to the reverse casing groove so that the convex surface faces the inside of the pipe. It characterized in that it forms a casing pipe part.

The step of forming the reverse casing pipe part comprises forming the reverse casing pipe part by joining an arcuate plate-shaped member having a radius of curvature equal to the radius of curvature of the casing pipe part to the reverse casing groove so that the convex surface faces the inside of the pipe. It is characterized.

The step of forming the reverse casing pipe part comprises forming the reverse casing pipe part by joining an arcuate plate-shaped member having a radius of curvature smaller than the radius of curvature of the casing pipe part to the reverse casing groove so that the convex surface faces the inside of the pipe. It is characterized.

In the forming of the reverse casing pipe part, forming the reverse casing pipe part by joining the same arcuate plate-shaped member having a radius of curvature greater than the radius of curvature of the casing pipe part to the reverse casing groove so that the convex surface faces the inside of the pipe. It is characterized by that.

In the step of forming the reverse casing pipe part, the arc-shaped plate member is manufactured by any one of rolling, bending, press forming, or casting processes, and then joined to the reverse casing groove.

According to the present invention having the above-described configuration, in the case of forming a pre-ground perforation in the ground and then overlapping with the pre-ground perforation to form a post-ground perforation, by maintaining a constant direction of the ground perforation during the progress of the ground perforation process. By allowing the ground drilling work to be performed accurately and efficiently, it is possible to maintain the verticality of the ground drilling, and by blocking the inflow of crushed stone into the inside of the previously formed ground drilling, it is a temporary block or dirt barrier after completion of the local drilling work. It provides the effect of making it easy to perform post-processing such as installation.

1 is a view schematically showing a water surface drilling process for forming a temporary barrier in water in the prior art described above.
Figure 2 is a perspective view of a ground drilling reverse casing 100 of an embodiment of the present invention.
3 is a plan view of an inverted casing 100 provided with an inverted casing tube portion 120 having the same radius of curvature as the casing tube portion 110. FIG.
4 is a plan view of an inverted casing 100 having an inverted casing tube portion 120 having a radius of curvature smaller than that of the casing tube portion 110. FIG.
5 is a plan view of an inverted casing 100 provided with an inverted casing tube portion 120 having a radius of curvature greater than that of the casing tube portion 110. FIG.
6 is a flow chart of a method for manufacturing an inverted casing according to an embodiment of the present invention.
7 is a diagram showing a process of manufacturing an inverted casing according to an embodiment of the present invention.
Figure 8 is a view showing a ground drilling construction process using the reverse casing (100, 100-1,..., 100-n) of an embodiment of the present invention.
9 is a view showing a state in which the first reverse casing 100-1 is fixed using a stopper 20 when the second ground perforation 15-2 is formed.

In the following description of the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted.

Since the embodiments according to the concept of the present invention can apply various changes and have various forms, specific embodiments are illustrated in the drawings and will be described in detail in the present specification or application. However, this is not intended to limit the embodiments according to the concept of the present invention to a specific form of disclosure, and the present invention should be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention.

When a component is referred to as being "connected" or "connected" to another component, it is understood that it may be directly connected or connected to the other component, but other components may exist in the middle. It should be. On the other hand, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there is no other component in the middle. Other expressions describing the relationship between components, such as "between" and "directly between" or "adjacent to" and "directly adjacent to" should be interpreted as well.

The terms used in the present specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present specification, terms such as "comprise" or "have" are intended to designate the presence of a set feature, number, step, action, component, part, or combination thereof, but one or more other features or numbers. It is to be understood that the possibility of addition or presence of, steps, actions, components, parts, or combinations thereof is not preliminarily excluded.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings showing embodiments of the present invention.

In the description of the embodiments of the present invention, when the ground perforations are collectively referred to or regardless of the order, reference numeral '15' is used, and when the ground perforations are referred to in order, reference numerals '15-1, 15-2,... '.

In the description of the embodiment of the present invention,'reverse casing' means'a pipe that penetrates the formed ground perforation by providing an inverted casing pipe part 120 to support an adjacent casing when performing a ground perforation in a rock layer. , When collectively referring to'inverted casing', reference numeral '100' is indicated, and when referring to inverse casings in order, reference numeral '100-1, 100-2,...' is indicated in order.

2 is a perspective view of an inverted casing 100 for ground drilling according to an embodiment of the present invention.

As shown in Figure 2, the reverse casing 100 of an embodiment of the present invention, in the present invention'when performing the ground drilling, to support the casing 10 inserted to perform the ground drilling by overlapping a predetermined area with the ground drilling formed first For the reverse casing pipe portion 120 means a pipe is formed) is formed of a steel pipe casing pipe 101 (see Figs. 2 and 7). Specifically, the reverse casing 100 has a casing pipe portion 110 having an inverted casing groove 111 along the length direction of the casing pipe 101 and a convex surface in the reverse casing groove 111 is the pipe ( It characterized in that it is configured to include an inverted casing pipe portion 120 formed by joining the arc-shaped plate-shaped member 121 to face the inside of 101).

In FIG. 2, the configuration of the reference numeral 101 indicated by the dotted circular arc indicates the pipe 101 before the formation of the arc-shaped groove 111, and the reference numeral 121 denotes an arc-shaped plate member 121 cut from the pipe 101. Represents.

The reverse casing pipe part 120 configured as described above may be formed to have various radii of curvature.

3 is a plan view of an inverted casing 100 having an inverted casing tube portion 120 having the same radius of curvature as the casing tube portion 110, and FIG. 4 is an inverted casing tube portion having a smaller radius of curvature than the casing tube portion 110 ( It is a plan view of the reverse casing 100 provided with 120, and FIG. 5 is a plan view of the reverse casing 100 provided with the reverse casing pipe part 120 which has a larger radius of curvature than the casing pipe part 110.

3, the reverse casing pipe portion 120 has the same radius of curvature as the casing pipe portion 110 and joins an arc-shaped plate member 121 having a width corresponding to the reverse casing groove 111 by welding, etc. Can be formed by

In this case, the arc-shaped plate-shaped member 121 may be formed by cutting a portion of the pipe 103 having a diameter equal to the diameter of the casing pipe portion 110. In addition, the arc-shaped plate member 121 may be a part of a pipe cut from the pipe 101 to form the reverse casing groove 111 as shown in FIG. 2.

As shown in FIG. 4, the reverse casing pipe part 120 may be formed of an arc-shaped plate member 121 having a radius of curvature smaller than that of the casing pipe part 110. In this case, the arc-shaped plate member 121 is formed by cutting a part of the pipe 105 having a diameter smaller than the diameter of the casing pipe portion 110.

As shown in FIG. 5, the reverse casing pipe part 120 may be formed of an arc-shaped plate member 121 having a radius of curvature greater than that of the casing pipe part 110. In this case, the arc-shaped plate member 121 is formed by cutting a part of the pipe 107 having a diameter larger than the diameter of the casing pipe portion 110.

6 is a flowchart of a method of manufacturing an inverted casing according to an embodiment of the present invention, and FIG. 7 is a view showing a process of manufacturing an inverted casing in an embodiment of the present invention.

6 and 7, the method of manufacturing an inverted casing for ground perforation for installation of a temporary barrier according to an embodiment of the present invention includes a casing pipe portion 110 having an inverted casing groove 111 along the length direction of the tube 101 The casing pipe portion forming step (S10) of forming a and an inverted casing pipe portion forming an inverted casing pipe portion 120 by bonding an arc-shaped plate member 121 concavely inwardly of the pipe to the inverted casing groove 111 It characterized in that it is configured to include the forming step (S20).

In the casing pipe part forming step (S10), a part of the pipe 101 corresponding to the reverse casing groove 111 is cut along the length direction, as shown in FIGS. 7A and 7B, and the casing pipe part It may be a step of forming (110).

In the step of forming the reverse casing pipe part (S20), an arc-shaped plate member 121 having a radius of curvature equal to the radius of curvature of the casing pipe part 110 is joined so that the convex surface faces the inside of the pipe, and the reverse casing pipe part It may be a step of forming (120). In this case, the arc-shaped plate member 121 is formed by cutting a part of the pipe 101 to be the reverse casing groove 111 along the length direction, as shown in FIGS. 7(c) and (d). In this case, in the step of forming the reverse casing pipe part (S20), the convex surface of the arc-shaped plate member 121 formed as described above faces the inside of the pipe 101 or the casing pipe part 110. It may be a step of forming the reverse casing pipe part 120 by bonding to the reverse casing groove 111 by welding or the like.

Alternatively, the arc-shaped plate-shaped member 121 may be formed by cutting a part of the pipe 103 having the same diameter as the diameter of the casing pipe portion 110, as shown in FIG. 3. In this case, in the step of forming the reverse casing pipe part (S20), an arc-shaped plate member 121 formed by cutting a part of the pipe 103 having the same diameter as the diameter of the casing pipe part 110 is formed into the pipe 101 Alternatively, it may be a step of forming the reverse casing pipe part 120 by bonding to the reverse casing groove 111 by welding or the like so as to face the inside of the casing pipe part 110.

In contrast, in the step of forming the reverse casing pipe part (S20), the convex surface of the arc-shaped plate member 121 having a radius of curvature (small diameter) smaller than the radius of curvature (diameter) of the casing pipe part 110 is formed of the tube ( 101) Alternatively, it may be a step of forming the reverse casing pipe part 120 by bonding so as to face the inside of the casing pipe part 110. In this case, the arc-shaped plate member 121 is formed by cutting a part of the pipe 105 having a diameter smaller than the diameter of the casing pipe portion 110 as shown in FIG. 4. In this case, in the step of forming the reverse casing pipe part (S20), an arc-shaped plate member 121 formed by cutting a part of the pipe 105 having a diameter smaller than the diameter of the casing pipe part 110 is formed into the pipe 101 Alternatively, it may be a step of forming the reverse casing pipe part 120 by bonding to the reverse casing groove 111 by welding or the like so as to face the inside of the casing pipe part 110.

In contrast, in the step of forming the reverse casing pipe part (S20), the convex surface of the arc-shaped plate member 121 having a radius of curvature greater than the radius of curvature (diameter) of the casing pipe part 110 is the pipe 101 or the casing. It may be a step of forming the reverse casing pipe part 120 by bonding so as to face the inside of the pipe part 110. In this case, the arc-shaped plate member 121 is formed by cutting a part of the pipe 107 having a diameter larger than the diameter of the casing pipe portion 110, as shown in FIG. 5. In this case, in the step of forming the reverse casing pipe part (S20), an arc-shaped plate member 121 formed by cutting a part of the pipe 107 having a diameter larger than the diameter of the casing pipe part 110 is formed into the pipe 101 Alternatively, it may be a step of forming the reverse casing pipe part 120 by bonding to the reverse casing groove 111 by welding or the like so as to face the inside of the casing pipe part 110.

In the description of an exemplary embodiment of the present invention described above, it has been described that the casing pipe portion 110 and the arc-shaped plate member 121 are formed by cutting a part of the pipes 101, 103, 105, and 107. Unlike this, The casing pipe portion 110 and the arc-shaped plate member 121 are manufactured by forming a plate-shaped steel member into the casing pipe portion 110 and the arc-shaped plate member 121 by rolling, bending, or press forming. Or, it may be produced by a casting process or the like.

Figure 8 is a view showing a ground drilling construction process using the reverse casing (100, 100-1,...,100-n) of an embodiment of the present invention, Figure 9 is a second ground drilling (15-2) It is a diagram showing a state in which the first reverse casing 100-1 is fixed using a stopper 20 during formation.

In the case of forming the ground perforation 15 on the ground, bottom or sea bottom using the reverse casing 100 of the present invention described above, a drilling drill 13 such as an auger, a screw drill, and a perforation drill is provided. After installing the casing 10 in a rock drilling machine (not shown), the casing 10 is penetrated to the upper area of the rock layer, and a drilling drill 13 is inserted into the casing 10 to target by hammering. A first ground perforation (15-1) having a depth is formed.

After that, the casing 10 is pulled out and removed, and then the first reverse casing 100-1 is driven into the formed first ground hole 15-1 to penetrate to the bottom of the first ground hole 15-1. In this case, the first inverted casing 100-1 is formed by selecting and intruding the inverted casing pipe portion 120 having a radius of curvature corresponding to the diameter of the second ground perforation 15-2 to be formed. It is possible to successively form ground perforations of various diameters having different diameters and overlapping regions.

Next, after penetrating the new casing 10 to the upper part of the rock layer at the location of the second ground drilling (15-2), the same operation as the process of forming the first ground drilling (15-1) was performed to A perforation (15-2) is formed. In this case, the first reverse casing (100-1) penetrated into the pre-formed ground perforation (15-1) is supported, and the casing (10) is side by vibration generated during the ground perforation for forming the second ground perforation. In order to prevent the position from being moved in the direction, as shown in FIG. 9, the first reverse casing 100-1 may be fixed with a stopper 20. The stopper 20 is fixed to the top of the first reverse casing 100-1 by welding or bolting, and after the ground drilling at an adjacent position and driving penetration of the reverse casing 100 are completed. Is configured to be easily removed. At this time, the stopper 20 is configured to support the reverse casing 100-1 and the casing 10 penetrated by driving. To this end, the stopper 20, as shown in Figure 9 (a), two side support consisting of two circular frames that are installed concentrically along the outer diameter and the inner diameter formed by the ground perforations 15 It may be configured to include a perforation direction support member 23 detachably installed on the side support member 21 to support the reverse casing 100 or the casing 10 penetrated with the member 21 in the perforation direction. have. According to the above-described configuration, when the reverse casing 100 is penetrated after the ground drilling is performed, as shown in FIG. 9 (a), the support member 23 in the perforation direction is provided so as to span between the side support members 21. It is installed to support the intrusive reverse casing 100 so that it does not move. In the case of performing a new ground drilling after the intrusion of the reverse casing 100 is finished, as shown in (b) or (c) of FIG. 9, after removing the support member 23 in the perforation direction, the reverse casing groove 111 By allowing the casing 10 to be supported so that a new ground perforation can be performed, it is possible to secure the verticality of the reverse casing 100 and the casing 10 to be penetrated.

The casing 10 is inserted into the reverse casing groove 111 of the first reverse casing 100-1 so that the opposite side of the first reverse casing 100-1 is inserted into the reverse casing groove 111. It is supported so that the verticality is maintained. In addition, in the process of forming the second ground hole by the first reverse casing (100-1), the crushed rock (17, see FIG. 1), etc., flows into the inside of the first ground hole (15-2). Is prevented. After the second ground perforation 15-2 is formed by the above-described process, the casing 10 is pulled out and removed, and then the second reverse casing 100-2 is penetrated into the second ground perforation 15-3.

After that, the ground drilling process of forming the above-described second ground drilling 100-2 is repeatedly performed at the location of the third ground drilling 15-3 to form a ground drilling. At this time, after the ground perforation 15 (15-1) is formed, a later ground perforation 15 (15-2) is continuously formed by using the casing 10 as shown in FIG. 9(b), or FIG. 9 As shown in (c) of (c), after forming the ground perforations (15) apart by one or more ground perforations, the casing 10 is penetrated to the upper part of the bedrock layer in the area between them, and the previously formed ground perforations (15-1, 12) and The back ground perforation is formed in a state that overlaps as much as the area corresponding to the reverse casing groove 11. At this time, the newly formed ground perforation corresponds to the reverse casing groove 11 of the previously formed ground perforations 151 and 15-2. In the vertical cavities 30 formed in the area overlapping the casing 10 inserted for the purpose of securing the discharge pressure (suction pressure) of the slime, sand, high-quality soil, or the same discharged when forming a ground perforation The slime including topographic soil is filled with the filling soil 31 to perform ground drilling. By filling the filling soil 31 in the vertical cavity 30 inside the casing 10, the vertical cavity ( It prevents the loss of upper suction pressure for removal of crushed rocks by 30), so that the slime can be discharged smoothly, so that the ground drilling process can be efficiently performed.

The reverse casings 100-1, .., 100-n may be removed after the reverse casing 100 is penetrated at the position of the adjacent ground perforation, or may be removed at the same time after the ground perforation is completed. In addition, prior to the pull-out removal of the reverse casings (100-1,...,100-n), foundation pouring is performed to form a bottom of concrete mixed with waterproofing material on the underwater floor, or ground perforation formed at the time of pull-out removal ( 15, 15-1,...,15-n) may be filled with a filler such as non-shrinkable mortar.

The above description of the present invention is for illustrative purposes only, and those of ordinary skill in the technical field to which the present invention pertains will be able to understand that other specific forms can be easily modified without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative and non-limiting in all respects. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as being distributed may also be implemented in a combined form.

The scope of the present invention is indicated by the claims to be described later, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention.

10: casing 13: drilling drill
15: ground perforation
15-1,… ,15-n: 1st to nth ground perforation
20: stopper
21: side support member 23: perforation direction support member
100: reverse casing
100-1,... ,100-n: 1st to nth inverse casing
101, 103, 105, 107: tube
110: casing pipe part
111: reverse casing groove 120: reverse casing pipe portion
121: arc-shaped plate member

Claims (14)

A casing pipe portion having an inverted casing groove along the longitudinal direction of the pipe; And
In the inverted casing including; an inverted casing pipe portion formed by joining an arc-shaped plate member to the inverted casing groove so that the convex surface faces the inside of the pipe,
The reverse casing pipe part,
For different reverse casings, an arc-shaped plate member having a radius of curvature equal to the radius of curvature of the casing pipe portion, an arc-shaped plate member having a radius of curvature smaller than the radius of curvature of the casing pipe portion, and a curvature greater than the radius of curvature of the casing pipe portion A back casing for ground drilling, characterized in that it is configured to continuously form ground apertures having different diameters by being formed of arc-shaped plate members each having a radius. The method of claim 1, wherein the reverse casing pipe portion,
An arc-shaped plate member cut to form the reverse casing groove of the pipe is formed by bonding to the reverse casing groove so that the convex surface faces the inside of the pipe. delete delete delete The method of claim 1,
An arc-shaped plate member forming the casing pipe portion and the reverse casing pipe portion is manufactured by any one of rolling, bending, press forming, or casting processes. Casing pipe portion forming step of forming a casing pipe portion having an inverted casing groove along the longitudinal direction of the pipe; And
Including; a step of forming an inverted casing pipe portion forming an inverted casing pipe portion by bonding an arc-shaped plate member concavely inwardly of the pipe to the inverted casing groove,
The step of forming the reverse casing pipe part,
With respect to different inverted casings, an arc-shaped plate member having a radius of curvature equal to the radius of curvature of the casing tube portion is joined to the inverted casing groove so that the convex surface faces the inside of the tube to form the inverted casing tube portion, Forming the inverse casing tube portion by joining an arc-shaped plate member having a radius of curvature smaller than the radius of curvature of the casing tube portion to the inverse casing groove so that the convex surface faces the inside of the tube to form the inverse casing tube portion, and the casing in the inverse casing groove Each of the reverse casing pipe portions of different reverse casings is formed by joining the same arc-shaped plate member having a radius of curvature greater than the radius of curvature of the pipe portion so that the convex surface faces the inside of the pipe to form the reverse casing pipe portion. Thereby, the method of manufacturing an inverted casing for ground perforation, characterized in that it is configured to produce an inverted casing configured to continuously form ground perforations having different diameters by using the different reverse casings. The method of claim 7, wherein the step of forming the casing pipe part,
A method of manufacturing an inverted casing for ground drilling, characterized in that a part of the tube corresponding to the inverted casing groove is cut along a longitudinal direction to form the casing tube part. The method of claim 7, wherein the step of forming the casing pipe part,
Rolling, bending, press forming or casting process, characterized in that the step of forming the casing pipe portion of the reverse casing manufacturing method for ground drilling. The method of claim 7, wherein the step of forming the reverse casing pipe part,
The inverted casing pipe portion is formed by joining an arc-shaped plate-shaped member formed by cutting a portion of the pipe that becomes the inverted casing groove along the length direction to the inverted casing groove so that the convex surface faces the inside of the tube. How to make reverse casing for ground drilling. delete delete delete The method of claim 7, wherein forming the reverse casing pipe portion,
A method of manufacturing a back casing for ground drilling, characterized in that the arc-shaped plate member is produced by any one of rolling, bending, press forming, or casting process, and then joined to the reverse casing groove.

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