KR102266397B1 - Steel pipe for steel pipe multi stage grouting and method of manufacturing the same - Google Patents

Abstract

A method of manufacturing a steel pipe for multi-stage grouting of a steel pipe includes forming a hole through a column surface of the steel pipe, and press-fitting a valve into the hole using a press device. For press-fitting the valve in the press device, the first diameter of the one surface of the press body contacting the valve is longer than the second diameter of the hole. The step of press-fitting includes inserting the valve into the hole using a press device until the first distance from one surface of the valve facing the outside of the steel pipe to the center line of the steel pipe is equal to the second distance from the outer surface of the steel pipe to the center line. , and after the valve is inserted into the hole, further insert the valve so that the first distance is shorter than the second distance using a press device, and apply pressure to the metal component of the steel pipe around the hole to cut a part of one surface of the valve from the metal component of the steel pipe covering by

Description

Steel pipe for multi-stage grouting of steel pipe and manufacturing method therefor {STEEL PIPE FOR STEEL PIPE MULTI STAGE GROUTING AND METHOD OF MANUFACTURING THE SAME}

The present disclosure relates to a material used in a construction method, and more particularly, to a steel pipe used in a multi-stage grouting method for a steel pipe and a manufacturing method thereof.

Multi-stage grouting of steel pipe is a construction method used in construction that requires ground stabilization, such as temporary retaining construction, slope stabilization construction, and tunnel excavation construction. For example, prior to tunnel excavation, multi-stage grouting of steel pipe is performed to insert a steel pipe into the perforation of the ground of the tunnel crown part along the direction in which the tunnel is to be excavated, and spray the grout into the ground through the inserted steel pipe. can Besides tunnel excavation work, multi-stage grouting of steel pipe can be implemented in various works to inject grout into the ground or structure through steel pipe.

When grout is injected into the ground through a steel pipe, the steel pipe and the ground are integrated, and the bearing capacity of the ground can be strengthened. For example, as multi-stage grouting of steel pipe is implemented, the load or earth pressure applied to the tunnel can be distributed or reduced. Therefore, multi-stage grouting of steel pipe can improve ground stability.

The steel pipe used in the steel pipe multi-stage grouting method may be configured to properly spray the grout injected into the steel pipe to the outside of the steel pipe. For example, when the grout from the outside of the steel pipe flows back into the inside of the steel pipe, multi-stage grouting of the steel pipe may not be properly performed. The steel pipe may be manufactured to have a configuration suitable for ground stabilization.

Embodiments of the present disclosure may provide a steel pipe for multi-stage grouting of a steel pipe and a manufacturing method thereof. In embodiments, a valve for preventing backflow of the grout may be inserted into the steel pipe. Embodiments may provide configurations for preventing the inserted valve from deviated from the steel pipe.

In some embodiments, a method of manufacturing a steel pipe for multi-stage grouting of a steel pipe may include forming a hole through a column surface of the steel pipe, and press-fitting a valve into the hole using a press device. In order to press-fit the valve in the press device, a first diameter of one surface of the press body in contact with the valve may be longer than a second diameter of the hole. The press-fitting includes inserting the valve into the hole using a press device until the first distance from one surface of the valve facing the outside of the steel pipe to the center line of the steel pipe is equal to the second distance from the outer surface of the steel pipe to the center line. , and after the valve is inserted into the hole, further insert the valve so that the first distance is shorter than the second distance using a press device, and apply pressure to the metal component of the steel pipe around the hole to cut a part of one surface of the valve from the metal component of the steel pipe It may include a step of covering by

In some embodiments, a method of manufacturing a steel pipe for multi-stage grouting of a steel pipe may include forming a hole through a column surface of the steel pipe, and caulking a valve in the hole. The caulking includes inserting the valve into the hole until a first distance from one side of the valve facing the outside of the steel pipe to the centerline of the steel pipe is equal to a second distance from the outer surface of the steel pipe to the centerline, and After being inserted into the tube, a groove concave compared to the outer surface of the steel pipe is formed to surround the valve, and a part of one surface of the valve is covered by the metal component of the steel tube around the hole.

In some embodiments, in a steel pipe for multi-stage grouting of a steel pipe, a valve may be inserted into a column surface of the steel pipe, and a recess recessed compared to the outer surface of the steel pipe may be formed to surround the valve. The valve may be inserted deeper than the outer surface of the steel pipe so that the distance from one surface of the valve facing the outside of the steel pipe to the center line of the steel pipe is shorter than the distance from the outer surface to the center line of the steel pipe. A metal component of the steel pipe protrudes from the edge region of the valve toward the center of the valve, so that a portion of one surface of the valve may be covered by the protruding metal component.

According to embodiments, even when the pressure inside the steel pipe is higher than the pressure outside the steel pipe, the valve inserted into the steel pipe may not separate from the steel pipe. Accordingly, the steel pipe can be configured to be suitable for multi-stage grouting of steel pipe and ground stabilization.

1 is a conceptual diagram illustrating an example of inserting a steel pipe into a hole in the ground in tunnel excavation work according to some embodiments.
2 is a conceptual diagram showing an example of multi-stage grouting of a steel pipe.
3 is a perspective view showing an exemplary configuration of a steel pipe and a valve inserted therein.
4 is a cross-sectional view showing an exemplary configuration of a steel pipe and a valve inserted therein.
5 is a flowchart illustrating an exemplary method of manufacturing a steel pipe according to embodiments.
6 is a perspective view showing an example of a press device used to insert a valve into a steel pipe.
7 is a cross-sectional view illustrating insertion of a valve into a steel pipe using a press device.
8 is a cross-sectional view illustrating an example of inserting a valve into a steel pipe.
9 is a perspective view exemplarily showing a valve inserted into a steel pipe.
10 is a conceptual diagram for explaining an example of spraying grout to the ground through a valve inserted into a steel pipe.
11 is a conceptual diagram for explaining an example in which a valve inserted into a steel pipe is separated from the steel pipe.
12 is a cross-sectional view showing an example of caulking the valve by further inserting the valve into the steel pipe.
13 is a cross-sectional view illustrating a valve caulked to a steel pipe.
14 is a perspective view exemplarily showing a valve caulked to a steel pipe.

The features mentioned above and the detailed description below show exemplary embodiments to enable a better understanding and description of the present disclosure. The present disclosure is not limited to these embodiments, and may be implemented in other perspectives. The following embodiments are merely examples for making the present disclosure complete, and are provided to convey clear descriptions to those of ordinary skill in the art to which the present disclosure pertains. Thus, where the present disclosure may be implemented in several embodiments, any of the specific or equivalents of these embodiments may be employed to implement the present disclosure.

When it is stated in the descriptions below that a certain element includes a specific element(s) or a process includes a specific operation(s), other element(s) or other operation(s) may be further included. can Terms used in the following descriptions are provided only to show specific embodiments, and are not intended to limit the present disclosure. Examples described to enable a better understanding may also include complementary embodiments thereof.

Terms used in the descriptions below may have meanings widely understood by those of ordinary skill in the art. Commonly used terms should be interpreted consistently according to the context of the descriptions. Furthermore, terms used in the descriptions below should not be construed as having overly idealistic or formal meanings unless their meanings are clearly defined. Hereinafter, some embodiments will be described with reference to the accompanying drawings.

1 is a conceptual diagram illustrating an example of inserting a steel pipe 1000 into a perforation 11 of the ground 10 in tunnel excavation construction according to some embodiments.

The ground 10 may be a target of construction requiring stabilization (eg, retaining temporary construction, slope stabilization construction, tunnel excavation construction, etc.). For example, when tunnel excavation work is carried out with respect to the ground 10 , the ground 10 may correspond to a crown portion in a direction in which the tunnel is to be excavated. In the descriptions below, tunnel excavation work will be provided as an example to enable a better understanding, but it will be well understood that the present disclosure is not limited thereto and may be variously applied in connection with other types of works. .

For stabilization of the ground 10 , prior to excavating the tunnel for the ground 10 , a steel pipe multi stage grouting method may be performed. In the multi-stage grouting of steel pipe, the perforation 11 may be formed in the ground 10 , and the steel pipe 1000 may be inserted into the perforation 11 .

The steel pipe 1000 may be one of the materials for multi-stage grouting of the steel pipe. The steel pipe 1000 may be composed of a metal component (eg, steel). For example, the steel pipe 1000 is a general structural carbon steel pipe (eg, KS D 3566 steel pipe) having an inner diameter of about 50.8 mm, an outer diameter of 57.5 mm to 63.5 mm, a thickness of 3.5 mm to 4.5 mm, and a tensile strength of 400 MPa or more. can However, this example is only one of possible configurations, and the present disclosure is not limited to this example.

Before the steel pipe 1000 is inserted into the perforation 11 , one or more valves 1100 may be inserted into the column surface of the steel pipe 1000 . One or more valves 1100 may be inserted to properly effect multi-stage grouting of the steel pipe. This will be further explained with reference to FIGS. 2 to 14 .

In the multi-stage grouting of steel pipe, grout may be injected through the steel pipe 1000 inserted into the perforation 11 . For example, the grout may include one or more of a variety of ingredients such as cement, clay, bentonite, asphalt, chemical, and the like. The grout injected into the steel pipe 1000 may be injected into the ground 10 through one or more valves 1100 . This will be further explained with reference to FIG. 2 .

2 is a conceptual diagram showing an example of multi-stage grouting of a steel pipe.

In the multi-stage grouting of steel pipe, the grout may be injected through the steel pipe 1000 inserted into the perforation 11 . The grout injected into the steel pipe 1000 may be injected into the ground 10 through one or more valves 1100 inserted into the column surface of the steel pipe 1000 . One or more valves 1100 may be inserted to properly effect multi-stage grouting of the steel pipe.

The one or more valves 1100 may allow grouting (ie, grout spraying) from the inside of the steel pipe 1000 to the outside of the steel pipe 1000 . On the other hand, the one or more valves 1100 may prevent a backflow of the grout from the outside of the steel pipe 1000 to the inside of the steel pipe 1000 . Accordingly, the steel pipe 1000 may be configured to properly spray the grout to the outside of the steel pipe 1000 .

Since it is well known that the configuration of each valve 1100 for preventing the backflow of the grout may be variously changed, a detailed description thereof will be omitted for the sake of brevity. Furthermore, since it is well known that actions such as inlet caulking, packer insertion, etc. may be employed for multi-stage grouting of steel pipe, a detailed description thereof will also be omitted for the sake of brevity.

When the grout is sprayed to the ground 10 through the steel pipe 1000 , the steel pipe 1000 and the ground 10 may be integrated to increase the bearing capacity of the ground 10 . Furthermore, the load or earth pressure applied to the ground 10 may be distributed or reduced. Therefore, the multi-stage grouting of the steel pipe can improve the stability of the ground (10).

3 is a perspective view showing an exemplary configuration of a steel pipe 1000 and a valve 1100a inserted therein. 4 is a cross-sectional view showing an exemplary configuration of the steel pipe 1000 and the valve 1100a inserted therein. In the descriptions below, the valve 1100a may be one of the one or more valves 1100 shown in FIGS. 1 and 2 .

Referring to FIGS. 3 and 4 together, in relation to manufacturing the steel pipe 1000 , a hole 1200a penetrating through the column surface of the steel pipe 1000 may be formed. For example, the hole 1200a may be formed using a metal processing apparatus such as a lathe, a miller, a drill, a punch, a grinder, etc. to spatially connect the inside of the steel pipe 1000 and the outside of the steel pipe 1000 .

After the hole 1200a is formed in the column surface of the steel pipe 1000 , the valve 1100a may be inserted into the hole 1200a (thus, it may be inserted into the column surface of the steel pipe 1000 ). In the present disclosure, inserting the valve 1100a into the column surface of the steel pipe 1000, inserting the valve 1100a into the hole 1200a, inserting the valve 1100a into the steel pipe 1000, etc. It can be understood in substantially the same technical context.

As described above, the valve 1100a inserted into the hole 1200a may allow grout spraying from the inside of the steel pipe 1000 to the outside of the steel pipe 1000 , and the steel pipe 1000 from the outside of the steel pipe 1000 . ) to prevent backflow into the interior. The insertion of the valve 1100a will be further described with reference to FIGS. 5 to 14 .

In some embodiments, the valve 1100a may include a support 1101a and a permeate 1103a. The support part 1101a may support the valve 1100a to the hole 1200a so that the valve 1100a does not deviate from the hole 1200a or the steel pipe 1000 (eg, by frictional force). The penetration part 1103a may transmit the grout so that the grout may be injected to the outside of the steel pipe 1000 through the valve 1100a inserted into the hole 1200a.

For example, the support part 1101a may be made of a component made of a rubber material, and the transmission part 1103a may be made of a component made of a plastic material. However, it will be well understood that the valve 1100a and its components are not limited thereto, and may be variously changed or modified to prevent backflow of the grout.

Each valve of the one or more valves 1100 may be configured substantially the same as or similarly to the valve 1100a, and redundant description thereof will be omitted below for the sake of brevity.

3 and 4 show one valve 1100a and one hole 1200a. However, in embodiments, a plurality of holes for inserting a plurality of valves may be formed in the column surface of the steel pipe 1000 substantially the same as or similar to the hole 1200a. For example, several holes may be alternately formed at left and right or upper and lower positions of the steel pipe 1000 at intervals of 0.5 m, and the diameter of each hole may be about 8 mm to 15 mm, but the present disclosure is not limited to these figures. It may be variously changed or modified. However, for the sake of brevity, the following descriptions will be provided based on one valve 1100a and one hole 1200a.

5 is a flowchart illustrating an exemplary method of manufacturing a steel pipe 1000 according to embodiments.

First, as described with reference to FIGS. 3 and 4 , a hole 1200a may be formed through the column surface of the steel pipe 1000 ( S110 ). Thereafter, the valve 1100a may be caulked to the hole 1200a of the steel pipe 1000 ( S130 ). Here, caulking may mean blocking a space such as the hole 1200a by using an object such as the valve 1100a.

In order to caulk the valve 1100a into the hole 1200a of the steel pipe 1000 ( S130 ), the valve 1100a may be primarily inserted into the hole 1200a ( S131 ). Here, the primary insertion is to insert the valve 1100a into the hole 1200a until one side facing the outside of the steel pipe 1000 among both sides of the valve 1100a is placed in a substantially flat position with the outer surface of the steel pipe 1000. It can mean to insert. This will be further explained with reference to FIGS. 8 and 9 .

After the valve 1100a is primarily inserted into the hole 1200a, in order to caulk (S130) the valve 1100a into the hole 1200a of the steel pipe 1000, the valve 1100a is inserted into the hole 1200a 2 It may be further inserted sequentially (S133). Here, the secondary insertion may mean additionally inserting the valve 1100a into a position deeper than the outer surface of the steel pipe 1000 after the primary insertion. This will be further explained with reference to FIGS. 12 to 14 .

6 is a perspective view showing an example of the press device 20 used to insert the valve 1100a into the steel pipe 1000 . 7 is a cross-sectional view illustrating insertion of the valve 1100a into the steel pipe 1000 using the press device 20 .

6 and 7 together, for example, in order to caulk the valve 1100a in the hole 1200a of the steel pipe 1000, the valve 1100a is installed in the hole 1200a using the press device 20. can be pressed. Here, press-fitting may mean inserting or caulking a certain object into a space such as the hole 1200a by applying pressure to a certain object by an assembly device such as the press device 20 .

The press device 20 may include a press body 21 . The press body 21 may be configured to move in an up and down direction. One surface of the press body 21 may be in contact with the valve 1100a to apply pressure on one surface of the valve 1100a (thus to press-fit the valve 1100a into the hole 1200a).

When the press body 21 moves in the downward direction while one surface of the press body 21 and one surface of the valve 1100a are in contact, the press body 21 can apply pressure on one surface of the valve 1100a. have. When pressure is applied to the valve 1100a in the downward direction, the valve 1100a may be press-fitted or caulked into the hole 1200a.

In the press device 20 , the diameter of one surface of the press body 21 in contact with the valve 1100a to press-fit the valve 1100a may be expressed as “Φ1”. Meanwhile, the diameter of the hole 1200a may be expressed as “Φ2”. In embodiments, the diameter “Φ1” of one surface of the press body 21 may be longer than the diameter “Φ2” of the hole 1200a. By way of example, “Φ1” may be 13.4 mm, and “Φ2” may be 12.7 mm. However, this example is only one of the possible configurations, and the present disclosure is not limited to these numerical values.

In embodiments, the press body 21 may further protrude from the press device 20 by at least a length of “D1” to apply pressure to the valve 1100a. In other words, when the press body 21 moves to the maximum limit in the downward direction, there may be a depth of at least "D1" between one surface of the press device 20 and one surface of the press body 21 . By way of example, “D1” may be about 0.9 mm. However, this example is only one of possible configurations, and the present disclosure is not limited to these numerical values.

A diameter of “Φ1” that is longer than a diameter of “Φ2” and a length of “D1” may be related to the secondary insertion of the valve 1100a ( S133 in FIG. 5 ). This will be further explained with reference to FIGS. 12 to 14 .

On the other hand, although the descriptions above and the descriptions below are discussed as using the press apparatus 20 , the present disclosure is not limited thereto. It is well understood that the press device 20 may be replaced with a variety of other types of assembly devices, tools, or persons capable of providing the physical force required to insert or caulk the valve 1100a into the hole 1200a. will be understood

8 is a cross-sectional view illustrating an example of inserting the valve 1100a into the steel pipe 1000 . 9 is a perspective view exemplarily showing the valve 1100a inserted into the steel pipe 1000 .

Referring to FIG. 8 , for example, when pressure is applied on the valve 1100a using the press device 20 , the valve 1100a moves through the hole 1200a (thus, on the column surface of the steel pipe 1000 ). ) can be inserted primarily. In the primary insertion, the valve 1100a may be inserted until one side facing the outside of the steel pipe 1000 among both sides of the valve 1100a is placed in a position substantially flat with the outer surface of the steel pipe 1000 .

In other words, in the primary insertion, the valve 1100a has a distance "D2" from one side of the valve 1100a facing the outside of the steel pipe 1000 to the center line CN of the steel pipe 1000 is the distance "D2" of the steel pipe 1000. It can be inserted into the hole 1200a (and thus in the column face of the steel pipe 1000) until the distance from the outer surface to the center line CN of the steel pipe 1000 becomes equal to “D3”.

Here, the center line CN may be understood as a line connecting the center of the upper surface and the center of the lower surface in relation to the steel pipe 1000 having a cylindrical shape. Furthermore, equivalent may mean not only exactly the same, but also substantially the same within an acceptable error range without significant difference.

According to the primary insertion, the valve 1100a may be inserted into the column surface of the steel pipe 1000 as shown in FIG. 9 . Referring to FIG. 9 , after the primary insertion, the valve 1100a may be inserted so that one surface of the valve 1100a is substantially at the same height as the height of the outer surface of the steel pipe 1000 .

In some cases, a steel pipe 1000 as shown in FIG. 9 may be used for multi-stage grouting of the steel pipe, which will be further described with reference to FIG. 10 . However, this steel pipe 1000 may cause deviation of the valve 1100a, which will be further described with reference to FIG. 11 .

10 is a conceptual diagram for explaining an example of spraying grout to the ground 10 through the valve 1100a inserted into the steel pipe (1000). 11 is a conceptual diagram for explaining an example in which the valve 1100a inserted into the steel pipe 1000 is separated from the steel pipe 1000 .

Referring to FIG. 10 , the grout may be injected into the steel pipe 1000 inserted into the perforation 11 . The grout injected into the steel pipe 1000 may flow through the steel pipe 1000 . After the grout is filled in the steel pipe 1000 , the grout may be injected into the ground 10 through the valve 1100a by pressure.

As the grout flows through the steel pipe 1000 and fills the inside of the steel pipe 1000 , a pressure of “P1” may be formed inside the steel pipe 1000 . Meanwhile, the external pressure of the steel pipe 1000 may be “P2”.

Before the grout is sprayed, the grout is filled only in the inside of the steel pipe 1000, so the pressure "P1" inside the steel pipe 1000 with respect to the grout may be higher than the pressure "P2" outside the steel pipe 1000 ( That is, P1>P2). In this case, referring to FIG. 11 , the valve 1100a may be separated from the hole 1200a (and thus from the column surface of the steel pipe 1000 ). More specifically, due to the pressure “P1” inside the steel pipe 1000 , the valve 1100a may deviate from the inside of the steel pipe 1000 to the outside of the steel pipe 1000 .

When the valve 1100a is separated from the steel pipe 1000 , the grout may flow back into the steel pipe 1000 from the ground 10 , and the grout may not be properly sprayed. In this case, multi-stage grouting of the steel pipe may not be properly implemented. Accordingly, as will be further described with reference to FIGS. 12 to 14 , in embodiments, in order to prevent the valve 1100a from being separated, the valve 1100a may be further inserted into the steel pipe 1000 secondarily.

12 is a cross-sectional view illustrating an example of caulking the valve 1100a by further inserting the valve 1100a into the steel pipe 1000 .

After the valve 1100a is primarily inserted into the column surface of the steel pipe 1000 (see FIG. 8 ), the valve 1100a may be further inserted secondarily.

For example, referring to FIG. 12 , a pressure may be applied on one surface of the valve 1100a facing the outside of the steel pipe 1000 by using the press device 20 . For example, the pressure applied using the press device 20 may be 5 MPa. However, this example is only one of possible configurations, and the present disclosure is not limited to these numerical values.

As described with reference to FIGS. 6 and 7 , the press body 21 may further protrude from the press device 20 by at least a length of “D1”. For example, from the state of FIG. 8 , the press body 21 may move further down a length of “D1” to apply pressure on one side of the valve 1100a. In this case, pressure may be applied on one surface of the valve 1100a, and the valve 1100a may be inserted deeper by a length corresponding to “D1”.

As pressure is applied on one surface of the valve 1100a even after the valve 1100a is primarily inserted into the column surface of the steel pipe 1000, the valve 1100a is inserted deeper than the outer surface of the steel pipe 1000 can be This will be further explained with reference to FIGS. 13 and 14 .

As the valve 1100a is further inserted, the distance between the valve 1100a and the center line CN of the steel pipe 1000 may become shorter. In other words, the distance "D2" from the one surface of the valve 1100a facing the outside of the steel pipe 1000 to the center line CN of the steel pipe 1000 is the center line CN of the steel pipe 1000 from the outer surface of the steel pipe 1000 The valve 1100a may be further inserted secondary to be shorter than the distance "D3" to the .

In this disclosure, to enable a better understanding, secondary insertions are described as distinct from primary insertions. However, the present disclosure is not limited thereto. For example, in the process of manufacturing the steel pipe 1000 , the secondary insertion may be performed consecutively after the primary insertion without being separated from the primary insertion in time series.

13 is a cross-sectional view exemplarily showing the valve 1100a caulked to the steel pipe 1000 . 14 is a perspective view illustrating the valve 1100a caulked to the steel pipe 1000 by way of example.

After the secondary insertion described with reference to FIG. 12 , the valve 1100a may be cocked into the hole 1200a of the steel pipe 1000 as shown in FIGS. 13 and 14 . Referring to FIG. 13 , as described with reference to FIG. 12 , the valve 1100a may be inserted deeper by the length of “D1 ′” corresponding to “D1” compared to the outer surface of the steel pipe 1000 .

As an example, if "D1" is 0.9 mm, "D1'" may be 0.9 mm or on the order of 0.9 mm with a slight error. In this example, the valve 1100a may be further inserted such that one surface of the valve 1100a facing the outside of the steel pipe 1000 is deeper by 0.9 mm than the outer surface of the steel pipe 1000 . However, this example is only one of possible configurations, and the present disclosure is not limited to these numerical values.

On the other hand, as described with reference to FIGS. 6 and 7 , the diameter “Φ1” of one surface of the press body 21 may be longer than the diameter “Φ2” of the hole 1200a. In this regard, comparing FIG. 12 with FIG. 8, as pressure is applied on one surface of the valve 1100a in the state of FIG. 8, the periphery of the hole 1200a (thus the periphery of the inserted valve 1100a) ), it will be understood that pressure is also applied to the metal component of the steel pipe 1000 . This is due to the diameter "Φ1" of one surface of the press body 21 that is longer than the diameter "Φ2" of the hole 1200a, so that one surface of the press body 21 has a metal component of the steel pipe 1000 around the hole 1200a and because it is in contact.

In other words, while the valve 1100a is further inserted secondarily, pressure may be applied to the metal component of the steel pipe 1000 around the hole 1200a by the press device 20 as well. For example, the pressure applied to the metal component of the steel pipe 1000 around the hole 1200a by using the press device 20 may be 5 MPa. However, this example is only one of possible configurations, and the present disclosure is not limited to these numerical values.

As pressure is applied to the metal component of the steel pipe 1000 around the hole 1200a while the valve 1100a is further inserted, the steel pipe 1000 around the hole 1200a may be pressed. Accordingly, a groove 1300a may be formed to surround the valve 1100a. The groove 1300a may be formed in a concave shape compared to the outer surface of the steel pipe 1000 . For example, from a cross-sectional view point, the groove 1300a may be viewed as a step shape.

The groove 1300a may be formed to have a diameter of “Φ1 ′”. The diameter “Φ1 ′” may correspond to the diameter “Φ1” of the press body 21 . As an example, if "Φ1" is 13.4mm, "Φ1'" may be 13.4mm or about 13.4mm with a slight error. However, this example is only one of possible configurations, and the present disclosure is not limited to these numerical values. Meanwhile, the diameter of the groove 1300a "Φ1'" may be longer than the diameter "Φ2" of the hole 1200a.

Comparing FIG. 8 with FIG. 13 , it can be understood that the space of the groove 1300a was filled with the metal component before pressure was applied to the metal component of the steel pipe 1000 around the hole 1200a. As pressure is applied to the metal component that filled the space of the groove 1300a, the steel pipe 1000 around the hole 1200a may be pressed and the groove 1300a may be formed.

On the other hand, when the groove 1300a is formed while the steel pipe 1000 is pressed while the valve 1100a is further inserted, the metal of the steel pipe 1000 in the direction from the edge region of the valve 1100a to the center of the valve 1100a Components may protrude. In other words, as the metal component that filled the space of the groove 1300a before the pressure is applied moves by the pressure, the shape of the steel pipe 1000 around the valve 1100a may change.

For example, as the metal component of the steel pipe 1000 protrudes and the shape of the steel pipe 1000 changes, the protrusion 1310 may be formed. The protrusion 1310 may be formed as the metal component that filled the space of the groove 1300a before pressure is applied to the metal component of the steel pipe 1000 around the hole 1200a moves by the pressure.

The protruding metal component of the steel pipe 1000 , that is, the protrusion 1310 may cover a portion of one surface of the valve 1100a facing the outside of the steel pipe 1000 . In other words, as the valve 1100a is further inserted and the steel pipe 1000 is pressed, a portion of one surface of the valve 1100a is a metal component of the steel pipe 1000 around the hole 1200a (that is, the protrusion 1310) ) can be covered by Here, a portion of one surface of the valve 1100a covered by the protrusion 1310 may include an edge region of one surface of the valve 1100a.

Upon secondary insertion, the valve 1100a may be caulked to the column face of the steel pipe 1000 as shown in FIG. 14 . Referring to FIG. 14 , after the secondary insertion, the valve 1100a may be inserted deeper than the outer surface of the steel pipe 1000 . Furthermore, a groove 1300a that is concave compared to the outer surface of the steel pipe 1000 may be formed to surround the valve 1100a, and the edge area of one surface of the valve 1100a may be covered by the protrusion 1310 .

As shown in FIG. 11 , the valve 1100a after the primary insertion may be separated from the steel pipe 1000 due to the internal pressure “P1” of the steel pipe 1000 . On the other hand, referring to FIGS. 13 and 14 , the valve 1100a after secondary insertion may be caulked so that a portion (eg, an edge region) of one surface of the valve 1100a is covered by the protrusion 1310 . The protrusion 1310 may fix the position of the valve 1100a so that the valve 1100a does not escape to the outside of the steel pipe 1000 .

As a result, according to embodiments, even when the internal pressure "P1" of the steel pipe 1000 is higher than the external pressure "P2" of the steel pipe 1000, the valve 1100a operates from the inside of the steel pipe 1000 to the steel pipe ( 1000) may not deviate in the outward direction. Therefore, the steel pipe 1000 manufactured according to the embodiments may be configured to be suitable for multi-stage grouting and ground stabilization of the steel pipe.

The configuration shown in each conceptual diagram should be understood only from a conceptual point of view. In order to enable a better understanding of some embodiments, the shape, structure, size, etc. of each of the elements shown in the conceptual diagram may be exaggerated or reduced. A configuration actually implemented may have a physical shape different from that shown in each conceptual diagram. Each conceptual diagram is not intended to limit the construction and physical shapes of its elements.

In the above, the present disclosure has been described based on some embodiments. However, due to the characteristics of the technical field to which the present disclosure pertains, the objects and effects intended by the present disclosure may be achieved by implementations different from the above embodiments while including the gist of the present disclosure. Accordingly, it should be understood that the above embodiments are illustrative rather than limiting. That is, implementations that can achieve the same objects and effects as the above embodiments while including the gist of the present disclosure should be interpreted as being included in the protection scope claimed by the present disclosure.

Accordingly, implementations that are changed or modified without departing from the essential characteristics of the present disclosure will fall within the protection scope claimed by the present disclosure. In addition, it should be understood that the protection scope of the present disclosure is not limited to the above embodiments, and covers the technical idea read from the claims below.

10: ground 11: perforation
20: press device 21: press body
1000: steel pipe 1100: one or more valves
1100a: valve 1101a: support
1103a: transmission part 1200a: hole
1300a: groove 1310: protrusion
Φ1: Diameter of one side of the press body
Φ1' : Groove diameter Φ2 : Hole diameter
D1: Length between one side of the press device and one side of the press body
D1' : Depth of the valve relative to the outer surface of the steel pipe
D2: Distance from one side of the valve to the center line of the steel pipe
D3: Distance from the outer surface of the steel pipe to the center line of the steel pipe
CN: center line of steel pipe

Claims (10)

In the method of manufacturing a steel pipe for multi-stage grouting of a steel pipe,
forming a hole penetrating the column surface of the steel pipe; and
Including the step of press-fitting the valve into the hole using a press device,
In order to press-fit the valve in the press device, the first diameter of one surface of the press body in contact with the valve is longer than the second diameter of the hole,
The press-fitting step is:
Insert the valve into the hole using the press device until the first distance from one surface of the valve facing the outside of the steel pipe to the center line of the steel pipe is equal to the second distance from the outer surface of the steel pipe to the center line. inserting; and
after the valve is inserted into the hole, further inserting the valve using the press device so that the first distance is shorter than the second distance and applying pressure to the periphery of the hole.
The method of claim 1,
As the pressure is applied to the metal component around the hole, a groove concave compared to the outer surface of the steel pipe is formed to surround the inserted valve.
3. The method of claim 2,
and a portion of the one side of the valve covered by the metallic component of the steel pipe includes a rim area of the one side of the valve.
3. The method of claim 2,
The tensile strength of the steel pipe is 400 MPa,
and the pressure applied to the metal component of the steel pipe around the hole by using the press device is 5 MPa.
delete delete delete In the steel pipe for multi-stage grouting of steel pipe,
A valve is inserted into the column surface of the steel pipe,
A groove concave concave compared to the outer surface of the steel pipe is formed to surround the inserted valve,
The valve is inserted deeper than the outer surface of the steel pipe so that the distance from one surface of the inserted valve facing the outside of the steel pipe to the center line of the steel pipe is shorter than the distance from the outer surface of the steel pipe to the center line, and , And
A steel pipe in which a metal component of the steel pipe protrudes from an edge region of the inserted valve toward a center of the inserted valve, so that a part of the one surface of the inserted valve is covered by the protruding metal component.
9. The method of claim 8,
wherein the valve is inserted into the column face to allow grouting of the steel pipe from the inside of the steel pipe to the outside and to prevent backflow of the steel pipe from the outside of the steel pipe to the inside.
9. The method of claim 8,
As the part of the one surface of the inserted valve is covered by the protruding metal component, when the pressure inside the steel pipe is greater than the pressure outside the steel pipe, the inserted valve moves to the inside of the steel pipe. A steel pipe that does not deviate from the outside in the direction of the steel pipe.

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