KR20190023598A - Steel pipe structure for multi step grouting - Google Patents

Abstract

Disclosed is a steel pipe structure for steel pipe multi-step grouting. The steel pipe structure for steel pipe multi-step grouting includes: a plurality of steel pipe pieces provided adjacent to each other along a circumferential direction; and a plurality of connecting devices connecting each of the plurality of steel pipe pieces with neighboring steel pipe pieces, wherein the plurality of connecting devices is provided so as to reach an expanded state in which each of the plurality of steel pipe pieces is spaced apart from neighboring pieces of steel pipe when applying outward pressure from the inside to the outside of the plurality of steel pipe pieces to be expanded, and the outward pressure can be the pressure which is applied by a grouting material inserted into the plurality of steel pipe pieces provided in a punching hole.

Description

STEEL PIPE STRUCTURE FOR MULTI STEP GROUTING [0002]

The present invention relates to a steel pipe structure for multi-stage grouting of steel pipes.

In tunnel construction, a commonly used method for reinforcing the upper half of excavation surface is steel pipe multi - stage grouting method using steel pipe type reinforcement. This is a reinforcing method widely used when excavating tunnels on soft ground. The reinforced concrete is reinforced with grooved steel pipe reinforcements around the excavated ground to prevent collapse or displacement of the ground during excavation. It is an effective method.

From the aspect of the process, the multi-stage grouting method of steel pipe generally drills around the upper end of the excavation surface at appropriate intervals along the length of the tunnel, arranges and installs steel pipes in the perforation holes and then inserts the grouting material into the steel pipes, It is a method to secure the stability of the membrane tunnel by integrating and filling the crack around the pipe to increase the strength of the ground.

At this time, in order to integrate the steel pipe and the ground, when the grouting material is injected into the steel pipe, a part of the grouting material needs to be discharged through the perforation hole outside the steel pipe. In order to discharge the grouting material, a large number of through holes are previously formed on the outer surface of the steel pipe.

The background technology of the present application is disclosed in Korean Patent Registration No. 0707138.

The present invention has been made to solve the above problems of the prior art and it is an object of the present invention to provide a steel pipe structure for a steel pipe multi-stage grouting capable of integrating a steel pipe with a ground by grouting material injected into a steel pipe, And to provide the above-mentioned objects.

It should be understood, however, that the technical scope of the embodiments of the present invention is not limited to the above-described technical problems, and other technical problems may exist.

According to an aspect of the present invention, there is provided a steel pipe structure for multi-stage grouting steel pipe, comprising: a plurality of steel pipe pieces disposed adjacent to each other along a circumferential direction; And a plurality of connecting mechanisms for connecting each of the plurality of steel tube pieces to neighboring steel tube pieces, wherein the plurality of connecting mechanisms includes a plurality of steel tube pieces, Each of which is adapted to reach an expanded state extending away from neighboring pieces of steel pipe and the outward pressure may be a pressure operated by a grouting material which is injected into the plurality of pieces of steel pipe disposed in the perforation hole.

Further, each of the plurality of connecting mechanisms may have a hinge folding link structure that interconnects two adjacent steel tube pieces among the plurality of steel tube pieces in an initial state and is folded inward.

In addition, the hinge folding type link structure may convert the plurality of pieces of steel pipe into the expanded state while at least partially expanding the folded portion when the outward pressure is applied in the initial state.

Further, in the expanded state, the hinge folding type link structure may be provided to prevent the folding of the outward pressure when the action of the outward pressure is released, and to maintain the expanded state.

The hinge folding type link structure may include a first link member to which the first steel pipe piece and one end thereof are connected, a second steel pipe piece that is adjacent to the first steel pipe piece in the circumferential direction, And a hinge unit for hinging the other end of the first link member and the other end of the second link member, wherein the other end of the first link member or the hinge unit is provided with a folding protrusion, And the folded restricting projection and the folded restricting groove can be fastened to each other with a fastening force for preventing re-folding at the time of releasing the action of the outward pressure.

Further, it is preferable that the plurality of pieces of steel tube further include a temporary fixing member which surrounds and clamps the plurality of pieces of steel pipe so as to maintain the initial state, wherein the temporary fixing member has a pressure of tightening smaller than the outward pressure, May be provided to have a smaller thrust pressure.

Further, the plurality of pieces of steel pipe may further include a temporary fixing member which surrounds and clamps the plurality of pieces of the steel pipe so as to maintain the initial state, and the temporary fixing member may be provided to have a tightening pressure smaller than the outward pressure.

The temporary fixing member may be formed of a material that is plastically deformed or broken when the pieces of the plurality of steel tubes are converted from the initial state to the expanded state so as to prevent elastic recovery when the outward pressure is released in the extended state .

The above-described task solution is merely exemplary and should not be construed as limiting the present disclosure. In addition to the exemplary embodiments described above, there may be additional embodiments in the drawings and the detailed description of the invention.

According to the present invention, the grouting material is injected into the perforation hole between the plurality of spaced apart pieces of steel pipe while the grouting material is injected, so that the grouting material is injected into the steel pipe even if no separate through- A steel pipe structure for multi-stage grouting steel pipe can be provided which is capable of grouting and integrating the steel pipe and the ground by discharging the grouting material through the perforation hole.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a three-dimensional view of a steel pipe structure for multi-stage grouting steel pipe according to one embodiment of the present invention; FIG.
2A is a cross-sectional view showing an initial state of a steel pipe structure for multi-stage grouting steel pipe according to one embodiment of the present invention.
FIG. 2B is a cross-sectional view illustrating an expanded state of a steel pipe structure for multi-stage steel pipe multi-stage grouting according to an embodiment of the present invention.
3A is a cross-sectional view illustrating a state in which the connection mechanism according to one embodiment is folded in an initial state.
FIG. 3B is a cross-sectional view illustrating a state in which the connection mechanism according to an exemplary embodiment is extended and expanded in an expanded state.
4A is a cross-sectional view showing a state in which the connection mechanism according to another embodiment is folded in an initial state.
FIG. 4B is a cross-sectional view illustrating a state in which the connection mechanism according to another embodiment is extended in an expanded state. FIG.
5 is a cross-sectional view for explaining a temporary fastening member surrounding and fastening a plurality of pieces of steel pipe in an initial state.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It should be understood, however, that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, the same reference numbers are used throughout the specification to refer to the same or like parts.

Throughout this specification, when a part is referred to as being "connected" to another part, it is not limited to a case where it is "directly connected" but also includes the case where it is "electrically connected" do.

It will be appreciated that throughout the specification it will be understood that when a member is located on another member "top", "top", "under", "bottom" But also the case where there is another member between the two members as well as the case where they are in contact with each other.

Throughout this specification, when an element is referred to as "including " an element, it is understood that the element may include other elements as well, without departing from the other elements unless specifically stated otherwise.

In the description of the embodiments of the present invention, the term (inner side, outer side, etc.) related to the direction or the position is set based on the arrangement state of each structure shown in the drawings. For example, when viewed in FIG. 2A, the direction toward the center of the steel pipe as a whole can be the inward direction, and the direction opposite to the outward direction. As another example, referring to FIG. 2B, the direction of the arrow (outward pressure) indicated by reference numeral 500 may be the outward direction.

Hereinafter, a steel pipe structure 1 for steel pipe multi-stage grouting according to an embodiment of the present invention will be described.

The steel pipe structure 1 for steel pipe multi-stage grouting according to an embodiment of the present invention may be installed at a place where the steel pipe multi-stage grouting method is applied. For example, the steel pipe structure 1 for steel pipe multi-stage grouting can be utilized in the steel pipe multi-stage grouting method applied to the vicinity of the excavation portion for construction of tunnels and the like.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a three-dimensional view of a steel pipe structure for multi-stage grouting steel pipe according to one embodiment of the present invention; FIG.

1, a steel pipe structure 1 for a steel pipe multi-stage grouting includes a plurality of steel pipe pieces 100 and a plurality of connecting mechanisms 200. As shown in FIG. The plurality of steel tube pieces 100 may be disposed adjacent to each other along the circumferential direction.

The plurality of steel tube pieces 100 may be a set of pieces cut in the longitudinal direction of a cylindrical (tubular, tubular or cylindrical) steel pipe having a hollow portion therein. One piece of the steel pipe 100 may be one of the pieces formed by cutting a cylindrical steel pipe having a hollow portion therein in the longitudinal direction several times at intervals along the circumferential direction.

The plurality of steel tube pieces 100 may be in the form of a cylindrical (tubular, tubular or cylindrical) steel pipe having a hollow portion disposed adjacent to each other along the circumferential direction (circumferential direction). For example, referring to FIG. 1, three pieces of steel pipe 100 may be disposed adjacent to each other along the circumferential direction to form a cylindrical steel pipe. However, the number of steel pipe pieces 100 is not limited thereto, have.

Further, the fact that the plurality of steel tube pieces 100 are disposed adjacent to each other along the circumferential direction means that they are disposed adjacent to each other such that they are in mutual contact or very close to each other as shown in Fig. 2A, It can be understood as a concept encompassing being disposed adjacent to each other.

In addition, the steel pipe piece 100 may be provided forcibly, but is not limited thereto. In other words, in the present invention, the word 'steel pipe' refers to a steel material in the meaning of the word itself, but it is not limited thereto, and it is preferable to understand it as a concept that collectively refers to a tubular member having various materials Do. In other words, the steel pipe structure of the present application is also applied to the multistage grouting method using a pipe of a material other than a steel pipe using the word 'steel pipe' in the sense of a structure applied to a known construction method of 'steel pipe multi-step grouting method' It can be interpreted as possible. The material of the steel pipe can be set as a material that can reinforce the ground through the multi-step grouting of the steel pipe.

The steel pipe structure for multi-stage grouting of a steel pipe may include a plurality of connecting mechanisms (200) for connecting each of the plurality of steel pipe pieces (100) to neighboring steel pipe pieces (100).

Illustratively, referring to FIG. 1, a plurality of connecting mechanisms 200 may be provided between two adjacent steel pipe segments 100 along the circumferential direction. Also, referring to FIG. 1, a plurality of connecting mechanisms 200 for interconnecting two neighboring steel tube pieces 100 may be disposed at predetermined intervals along the longitudinal direction.

FIG. 2A is a cross-sectional view showing an initial state of a steel pipe multi-stage grouting steel pipe structure according to an embodiment of the present invention, and FIG. 2B is an enlarged cross-sectional view illustrating a steel pipe multi-step grouting steel pipe structure according to an embodiment of the present invention.

Each of the plurality of connecting mechanisms 200 may have a hinge folding link structure that interconnects two neighboring steel tube pieces 100 among the plurality of steel tube pieces 100 in an initial state and is folded inward.

Referring to FIG. 2A, a state in which neighboring pieces of steel pipe 100 are arranged adjacent to each other or adjacent to each other in the circumferential direction before the grouting material is injected may be referred to as an initial state. In this initial state, the plurality of connecting mechanisms 200 are provided inside the plurality of steel tube pieces 100 and have a hinge folding link structure folded inward (folded), and a plurality of steel tube pieces 100 are connected to each other It is possible to make the steel pipe piece 100 in the form of a cylindrical steel pipe in an initial state.

The hinge folding type linkage structure includes a first link member 210 to which the first steel pipe piece 100 and one end thereof are connected, a first steel pipe piece 100 and a second steel pipe piece And a hinge unit 230 hinged to the other end of the first link member 210 and the other end of the second link member 220. The hinge unit 230 includes a first link member 220 and a second link member 220, The hinge unit 230 may have various known hinge structures and hinge structures to be developed in the future.

The first steel pipe piece and the second steel pipe piece may be two neighboring steel pipe pieces among the plurality of steel pipe pieces 100. 2B, one end of the first link member 210 may be hinged to the first piece of steel pipe, and one end of the second link member 220 may be hinged to the second piece of steel pipe. That is, the first link member 210 and the second link member 220 can be hinged to each other at their opposite ends by the hinge unit 230, and each end is hinged to each of the first and second steel pipe pieces . The hinge connection at each end may also be accomplished by a conventionally known hinge member or a hinge member to be developed in the future. Illustratively, the hinge unit may be of the same or similar construction as the hinge unit 230, but is not limited thereto.

The plurality of connecting mechanisms 200 are configured such that each of the plurality of pieces of steel pipe 100 is extended and spaced apart from the neighboring steel pipe pieces 100 in the action of the outward pressure 500 from the inside to the outside of the plurality of steel pipe pieces 100 To reach an extended state. At this time, the outward pressure 500 may be a pressure operated by the grouting material injected into the plurality of steel tube pieces 100 arranged in the perforation hole.

Referring to FIG. 2B, when the grouting material is injected into the plurality of steel tube pieces 100 and the outward pressure 500 is applied, the plurality of steel tube pieces 100 arranged adjacent to each other can reach an expanded state . Referring to FIG. 2B, the spacing of the plurality of steel tube segments 100 in the expanded state from the neighboring steel tube segments 100 may be determined by the connecting mechanism 200. For example, as the lengths of the first link member 210 and the second link member 220 of the connection mechanism 200 become longer, the plurality of steel tube pieces 200 may be expanded to a shape that is spaced further apart from each other .

Further, the expanded width (size) of the plurality of steel tube pieces 100 in the expanded state may be smaller than the width (size) of the perforation holes. Referring to FIG. 2B, the plurality of steel tube pieces 100 and the connecting mechanism 200 are arranged such that, when the steel tube multi-stage steel tube structure 1 for a grooved steel pipe is expanded (outer width) (Inner width) of the perforation hole. According to this setting, the grouting material injected into the plurality of steel pipe pieces 100 passes between the plurality of steel pipe pieces 100 and is wrapped to the outside of the plurality of steel pipe pieces 100 to fill the gap (crack) So that the plurality of steel tube pieces 100, the grouting material and the ground can be more firmly integrated than in the prior art without the conventional through holes. As a result, the grouting material is transferred between the plurality of steel tube pieces 100 spaced from each other, and the plurality of steel tube pieces 100 and the ground are integrally grooved by the outward pressure applied by the grouting re- .

When the outward pressure 500 is applied in the initial state, the hinge folding link structure can convert the plurality of steel tube pieces 100 into an expanded state while at least partially expanding the folded portion. When the grouting material is injected, the first link member 210 and the second link member 220 can be rotated while being rotated about the hinge unit 230 when the outward pressure 500 is applied. Referring to FIG. 2B, the first link member 210 and the second link member 220 may be completely extended to form an angle of 180 degrees with respect to each other, but the present invention is not limited thereto. As another example, in the extended state, the first link member 210 and the second link member 220 may maintain a somewhat bent state so as to form an angle of less than 180 degrees with each other. 2B, as described above, the first link member 210 and the second link member 220 of the connection mechanism 200 are not only hingedly connected to each other, but also a first steel pipe piece and a second And can be hinged to each of the steel pipe pieces.

3A and 4A are sectional views showing a state in which the connection mechanism according to each embodiment is folded in an initial state, and FIGS. 3B and 4B show a state in which the connection mechanism according to each embodiment is extended and expanded in an expanded state Sectional view.

The other end of the first link member 210 or the hinge unit 230 is provided with a folding protrusion 231 and the other end of the second link member 220 is provided with a fold restriction A groove 232 may be provided. The contact limiting protrusion 231 and the folding restriction groove 232 may be formed in such a form that a wedge connection capable of a much larger external force is required than the external force required for unclamping. Accordingly, once the folding restricting projection 231 is fastened to the folding restricting groove 232, the re-folding can be restricted.

3A, the hinge unit 230 may be provided with a folding protrusion 231, and the second link member 220 may be provided with a folding restriction groove 232 at the other end thereof. Referring to FIGS. 3A and 3B together, the folded limiting groove 232 may be formed in a shape of a recessed stepped groove having a predetermined step. The folding restricting protrusion 231 may be provided on the inclined face so that the folding restricting projection 231 enters the folding restricting groove 232 so that the folding restricting projection 231 can easily enter the folding restricting groove 232. Conversely, a surface of the fold restricting protrusion 231 opposite to the surface that enters the fold restriction grooves 232 may be provided so as to have a structure to be engaged with the step restricting grooves so as to limit the folding again.

4A, a folding restricting projection 231 having one end connected to the other end of the first link member 210 and a folding restricting groove 232 is formed at the other end of the second link member 220, . 4A and 4B, the folded restricting groove 232 may be formed in the shape of a recessed stepped groove with a predetermined step. The folding restricting protrusion 231 may be provided on the inclined face so that the folding restricting projection 231 enters the folding restricting groove 232 so that the folding restricting projection 231 can easily enter the folding restricting groove 232. Conversely, a surface of the fold restricting protrusion 231 opposite to the surface that enters the fold restriction grooves 232 may be provided so as to have a structure to be engaged with the step restricting grooves so as to limit the folding again.

However, the joining method and structure of the folding restricting protrusion and the folding restricting groove are not limited to the above-described embodiments, and various joining methods and structures may be used, which are easy to enter into the extended state and restricted to return to the initial state Can be employed.

As described above, the contact restricting protrusion 231 and the fold restriction groove 232 can be provided in such a form that wedge engagement is possible so that mutual engagement is easy and lock disengagement is limited. For this purpose, the folding protrusion 231 may be formed such that an entry face that is in contact with the other end face of the second link member 220 when it enters the fold restriction groove 232 is formed to be inclined with respect to the other end face. The stepped surface of the folded restricting groove 2320 and the surface opposite to the entry surface of the folded restricting projection 231 may be wedge-coupled in a direction to restrict the re-folding.

That is, the fold restricting projection 231 and the fold limiting groove 232 can be fastened to each other by a fastening force that prevents the folding restricting projection 231 from being re-folded when the outward pressure 500 is released. The tightening force with which the folding restricting projection 231 and the folding restricting groove 232 are fastened is not refolded even if a slight opposite pressure (inward pressure) is applied when the grouting material injection is completed and the outward pressure 500 is not applied It may be a fastening force enough to maintain the fastened state. As such, in the expanded state, the hinge folded link structure can be provided to prevent re-folding upon release of the outward pressure 500 and maintain the expanded state. The folded restricting projection 231 and the folded restricting groove 232 can be maintained in the extended state even when the outward pressure 500 is released while the folded restricting projection 231 is fastened with a fastening force not to be refolded.

The plurality of folding restricting projections 231 and the folding restricting grooves 232 may be provided at intervals in the longitudinal direction with respect to one connecting mechanism 200.

FIG. 5 is a cross-sectional view of a steel pipe multi-stage grouting steel pipe structure showing a plurality of steel pipe pieces surrounding and fastening the steel pipe piece in an initial state according to an embodiment of the present invention.

Referring to FIG. 5, the plurality of pieces of steel pipe 100 may include a plurality of steel pipe pieces 100 so as to maintain the initial state. The temporary fixing member 300 may be provided so as to surround the peripheries of the plurality of steel tube pieces 100 with a predetermined tightening force (tightening pressure) so that the plurality of steel tube pieces 100 can not be changed to the expanded state.

The temporary fixing member 300 surrounding and clamping the plurality of steel tube pieces 100 may be provided to have a thrust pressure smaller than the outward pressure 500 so that the plurality of steel tube pieces 100 maintain the initial state. Accordingly, when the outward pressure 500 due to the grouting material injection is applied to the plurality of steel tube pieces 100 despite the temporary tightening by the tightening member 300, the plurality of steel tube pieces 100 are expanded Can be converted. That is, the plurality of pieces of steel tube 100 are tightened with the tightening pressure smaller than the outward pressure 500, and the temporary fixation of the temporary fixing member 300 is temporarily fixed by a fixing force of a pressure exceeding the outward pressure 500, . ≪ / RTI >

The temporary fixing member 300 has a tightening pressure smaller than the outward pressure 500 and is smaller than the pressure (tightening pressure) corresponding to the tightening force of the fold limiting protrusion 231 and the fold limiting groove 232 May be provided to have a tightening pressure. That is, the temporary fixing member 300 is provided so as to have a tightening pressure smaller than the clamping force for clamping the fold limiting protrusion 231 and the fold limiting groove 232, so that the fold limiting protrusion 231 and the fold limiting groove 232 are fastened The connecting member 200 is prevented from being folded again by the moving member 300 and the fastening state of the folding protrusion 231 and the cut-in limiting groove 232, The expanded state of the piece 100 can be maintained.

The temporary fixing member 300 may be made of a material that is plastically deformed or broken when a plurality of pieces of steel tube 100 are converted from an initial state to an expanded state such that elastic recovery is prevented when the outward pressure 500 is released .

In one embodiment, the temporary holding material 300 is expanded when the grouting material is injected by the outward pressure 500 larger than its own tightening force and the plurality of pieces of steel tube 100 are converted into the expanded state, This stretching deformation may be a plastic deformation rather than an elastic deformation. That is, the temporary fixing member 300 may be provided with a plastic deformation material that does not undergo elastic recovery once it has been increased to correspond to the expanded state. Alternatively, the temporary fixing member 300 may be made of a material having elasticity (elastic force) to such an extent that it can be broken when the initial state is changed to the extended state. In the initial state, the temporary fixing member 300 surrounds the outer surfaces of the plurality of steel tube pieces 100 (see FIG. 5). However, in the extended state, the temporary fixing member 300 is cut off and the tightening pressure (tightening force) can be removed. Accordingly, when the injection of the grouting material is completed or stopped in the expanded state, the action of the tightening pressure (tightening) of the temporary fixing member 300 can also be stopped by the plastic deformation or breakage of the temporary fixing member 300, The plurality of steel tube pieces 100 reaching the expanded state can be maintained in the expanded state without the influence of the stationary member 300 even when the outward pressure 500 is not operated.

Hereinafter, a method of grooving a steel pipe multi-step using a steel pipe structure for multi-stage grouting steel pipe according to an embodiment of the present invention will be described. However, the multi-step grouting method of the steel pipe is a method using the steel pipe structure for multi-stage grouting of steel pipes according to one embodiment of the present invention, and it is assumed that the steel pipe multi-step grouting method according to one embodiment of the present invention shares the same or corresponding technical features. The same reference numerals are used for the same or similar parts to those of the steel pipe structure for grouting, and a duplicate description will be simplified or omitted. Since the steel pipe multi-stage grouting method (construction method) is also a method (construction method) that is obvious to those of ordinary skill in the art, the steel pipe multi-stage grouting steel pipe structure according to one embodiment of the present invention is used, I will explain.

The multi-stage grouting method for a steel pipe using the multi-stage grouting steel pipe structure 1 may include a step of inserting a steel pipe multi-stage grouting steel pipe structure 1 into a perforation hole by forming a perforation hole in the longitudinal direction of the tunnel.

At this time, the perforation holes formed in the ground can be made to have a size (width) larger than the size (width) of the plurality of steel pipe segments 100 in the expanded state.

The multi-step grouting method of a steel pipe using the steel pipe structure for multi-stage grouting of a steel pipe may include a step of caulking the gap between the inlet of the perforation hole and the steel pipe structure for multi-stage grouting of the steel pipe by using a caulking material. This caulking is performed between the inlet of the perforation hole and the steel pipe structure for multi-stage grouting steel pipe 1 to prevent the grouting material from flowing out when the grouting material is injected.

The multi-stage grouting method of a steel pipe using the steel pipe structure for a steel pipe multi-stage grouting may include a step of grouting the inside of the steel pipe by injecting a grouting material into the steel pipe structure for multi-stage grouting of a steel pipe. The plurality of pieces of steel pipe 100 can be converted from the initial state to the expanded state by the outward pressure 500 acting from the inner side to the outer side of the plurality of steel pipe pieces 100 when the grouting material is injected. The grouting material passes through a plurality of spaced steel tube pieces 100 and is moved to the outside of the plurality of steel tube pieces 100 and a part of the grouting material is filled in the ground cracked portion in the inner circumference of the hole, And the ground can be integrated. Since this has been described above, a more detailed description will be omitted.

It will be understood by those of ordinary skill in the art that the foregoing description of the embodiments is for illustrative purposes and that those skilled in the art can easily modify the invention without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

1: Steel pipe structure for multi-stage grouting
100: Steel pipe sculpture
200:
210: first link member
220: second link member
230: Hinge unit
231: folding protrusion
232: Folding restriction groove
300: Go government
500: Outward pressure

Claims (8)

A steel pipe structure for multi-stage grouting of steel pipes,
A plurality of steel pipe pieces disposed adjacent to each other along the circumferential direction; And
And a plurality of connecting mechanisms for connecting each of the plurality of steel tube pieces with neighboring steel tube pieces,
The plurality of connecting mechanisms are provided so as to reach an expanded state in which each of the plurality of pieces of steel pipe is spaced apart from neighboring pieces of steel pipe in an outward pressure action from the inside to the outside of the plurality of steel pipe pieces,
Wherein the outward pressure is a pressure applied by a grouting material injected into the plurality of pieces of steel pipe disposed in the perforation hole. The method according to claim 1,
Wherein each of said plurality of connecting mechanisms has a hinge folding link structure that interconnects two adjacent steel tube pieces of said plurality of steel tube pieces in an initial state and is folded inward. 3. The method of claim 2,
Wherein the hinge folding type link structure transforms the plurality of pieces of steel pipe into the expanded state while at least partially expanding the folded portion when the outward pressure is applied in the initial state. The method of claim 3,
Wherein in the expanded state, the hinge folding type link structure is provided to prevent refolding when the outward pressure action is released, and to maintain the expanded state. 5. The method of claim 4,
The hinge folding type link structure includes a first link member having a first steel pipe piece and a first link member to which one end thereof is connected, a second link member having one end connected to the second steel pipe piece adjacent to the first steel pipe piece in the circumferential direction, And a hinge unit for hinging the other end of the first link member and the other end of the second link member,
The other end of the first link member or the hinge unit is provided with a folding restricting projection,
And the other end of the second link member is provided with a folded limiting groove to be engaged with the folded restricting projection in the extended state,
Wherein the folding restricting projection and the folding restricting groove are mutually fastened by a fastening force that prevents the folding restricting projection and the folding restricting groove from being re-folded when releasing the outward pressure action. 6. The method of claim 5,
Further comprising a temporary fixing member that surrounds and clamps the plurality of pieces of the steel pipe so that the plurality of pieces of the pipe remain in the initial state,
Wherein the temporary fixing member is provided so as to have a tightening pressure smaller than the outward pressure and to have a tightening pressure smaller than a pressure corresponding to the tightening force. The method of claim 3,
Further comprising a temporary fixing member which surrounds and clamps the plurality of pieces of the steel pipe so that the plurality of pieces of the pipe remain in the initial state,
Wherein the temporary fixing member is provided to have a thrust pressure smaller than the outward pressure. 8. The method of claim 7,
Wherein the temporary fixing member is made of a material that is plastically deformed or broken when the plurality of pieces of the steel pipe are converted from the initial state to the expanded state so as to prevent elastic recovery when the outward pressure is released in the extended state, Steel pipe structure for multi - stage grouting.

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