KR20220012119A - Tunnel Structure Construction Method by Steel Pipe Installed Lead Steel Pipe - Google Patents

Abstract

Provided is a tunnel structure construction method using a steel pipe provided with a lead steel pipe. In order to facilitate press-in work for a steel pipe, enable excellent quality management and shorten a construction period, the method includes: a base installation step of installing an advancement base at one end of a tunnel structure construction section and installing an arrival base at the other end of the tunnel structure construction section; a first press-in step of advancing a plurality of steel pipes having an inner or outer part combined with a lead steel pipe from the advancement base to press the steel pipes into the ground such that the steel pipes are arranged in a form corresponding to a cross sectional shape of a tunnel structure to be constructed; a first excavation step of excavating the inside of the steel pipes; a first connection step of connecting and installing a plurality of segmental structures which are premanufactured and connected to form the tunnel structure to the back of the steel pipes; a second press-in step of advancing the lead steel pipe to press the pipe into the ground in front of the steel pipes; a structure insertion step of advancing the segmental structures connected to the back of the steel pipes to move the segmental structures and the steel pipes forward; a second excavation step of excavating earth and sand in the segmental structures and the lead steel pipe; a second connection step of connecting and installing another segmental structure to the back of the segmental structures; and a repetition step of sequentially repeating the second press-in step, the structure insertion step and the second excavation step after the second connection step.

Description

Tunnel Structure Construction Method by Steel Pipe Installed Lead Steel Pipe

The present invention relates to a method of constructing a tunnel structure using a steel pipe in which a lead steel pipe is installed, and more particularly, the force required for propulsion is reduced because there is no need to press-fit the steel pipe so that the steel pipe is disposed over the entire section from the starting point to the end point. It relates to a construction method of a tunnel structure using a steel pipe installed with a steel pipe.

In general, the open-cut method and the non-open method are known as methods of constructing tunnel structures in the ground.

The opencut method is a method of excavating a large trench from the ground, building a tunnel structure in it, and then backfilling it to restore it to its original state.

The non-cutting method can be mainly performed when it is impossible to open a hole. For example, it can be usefully adopted when constructing a tunnel structure that crosses the lower part of an existing road, railroad, building, etc.

Representative non-opening methods include the mesh shield method, the pipe loop method, and the large-diameter steel pipe press-in method (NTR method).

As disclosed in Patent No. 1987-0001379, the Messer Shield method is a method of constructing an underground tunnel by inserting and advancing a messer into a makjang from the soil layer and excavating the makjang in a non-excavating manner.

However, the Messer Shield method requires additional implementation of multi-stage grouting of a pipe loop or steel pipe on the upper section of the section where the structure is to be formed in order to secure stability against a large load on the top. There are problems such as

The pipe loop method is a non-opening type underground tunnel construction method that can achieve the effect of dispersing and reducing the superimposed load and earth pressure applied to the tunnel during tunnel excavation by press-fitting the steel pipe in an appropriate shape into the ground before excavating the tunnel. In addition, recently, as disclosed in Korean Patent Registration No. 10-0562158, coupling means are attached to both sides of the steel pipe for tighter fastening of the steel pipe forming the pipe loop, and a plurality of penetrations through which the fixture can be fastened. A ball is also formed.

However, in the pipe loop method, the strength of the material decreases due to corrosion as the entire outer periphery of the tunnel structure is formed of a pipe, and constructability and safety in the lower part of railways, roads, and large structures where the earth pressure is large or a large load is applied. And there was a problem in that it was difficult to apply due to the problem of economic feasibility.

In the large-diameter steel pipe press-fitting method (NTR method), a large-diameter steel pipe is press-fitted in the longitudinal direction at the position of the section where the tunnel structure is to be formed, the side part of the steel pipe is removed, and the upper and lower parts of the neighboring steel pipe are connected with iron plates to form a steel frame inside the steel pipe. It is a construction method of a non-opening type tunnel structure in which the inside of the tunnel is excavated after the structure is poured.

However, in the large-diameter steel pipe press-fitting method, since the large-diameter steel pipe is press-fitted at the cross-sectional location where the tunnel structure is to be formed, the steel pipe is applied to the upper part and all of the wall parts, and thus construction cost and construction time are problematic.

The present invention has been made from a bird's eye view of the above points, and since it is not necessary to press-fit several steel pipes in succession, press-fitting is easy, and the construction cost is reduced because the steel pipes are collected without being buried in the ground, and by connecting pre-fabricated segment structures The purpose of this is to provide a tunnel construction method using a steel pipe installed with a lead steel pipe that can control quality and shorten the construction period by constructing a tunnel structure.

The tunnel structure construction method using a steel pipe installed with a lead steel pipe proposed by the present invention includes a base installation step of installing a propulsion base at one end point of the tunnel structure construction section and installing an arrival base at the other end point of the tunnel structure construction section; A first press-fitting step of pushing a plurality of steel pipes coupled to the inside or outside of the lead steel pipe into the ground so that the steel pipes are arranged in a shape corresponding to the cross-sectional shape of the tunnel structure to be built by propulsion at the propulsion base; A first excavation step of digging, a first connection step of connecting and installing the segmented structures that are manufactured in advance and connected to form the tunnel structure behind the steel pipe, and a second step of pushing the lead steel pipe into the ground in front of the steel pipe A press-fitting step, a structure insertion step of moving the segmented structure and the steel pipe forward by pushing the segmented structure connected behind the steel pipe, a second excavation step of digging up the inside of the segmented structure and the lead steel pipe, and connecting another segmented structure behind the segmented structure A second connection step of installing, and a repeating step of sequentially repeating the second press-in step, the structure insertion step, and the second excavation step after the second connection step.

The steel pipes are arranged in the shape of a c (digwu) or d (tee), ㅁ (minor), arc shape, or the like.

The steel pipe and the lead steel pipe are formed to have a circular cross section.

The cross-sectional shape of the steel pipe and the lead steel pipe may be formed in a quadrangle or may be formed in various ways, such as a polygon.

According to the method for constructing a tunnel structure using a steel pipe in which a lead steel pipe is installed according to an embodiment of the present invention, a space in which the segmented structure is inserted by the steel pipe and the lead steel pipe is secured in advance and the segmented structure is propelled into the secured space, so the driving force is reduced and easy to carry out.

In addition, according to the method for constructing a tunnel structure using a steel pipe installed with a fresh steel pipe according to an embodiment of the present invention, the structure to be installed is manufactured in advance at the factory, so that quality control is easy and the construction period is shortened.

Furthermore, according to the tunnel structure construction method using a steel pipe installed with a fresh steel pipe according to an embodiment of the present invention, since the steel pipe is recovered without being buried, the installation cost is reduced and post-management is easy.

In addition, according to the method for constructing a tunnel structure using a steel pipe in which a lead steel pipe is installed according to an embodiment of the present invention, the connection position between the segmented structures can be adjusted, so that the tunnel structure can be easily constructed in a curved shape.

1 is a block diagram showing a construction method of a tunnel structure using a steel pipe in which a lead steel pipe is installed according to an embodiment of the present invention.
2A is a perspective view of a tunnel structure constructed by a tunnel structure construction method using a steel pipe in which a lead steel pipe is installed according to an embodiment of the present invention.
2B is a side cross-sectional view of a tunnel structure constructed by a tunnel structure construction method using a steel pipe in which a lead steel pipe is installed according to an embodiment of the present invention.
2C is another cross-sectional side view of a tunnel structure constructed by a tunnel structure construction method using a steel pipe in which a lead steel pipe is installed according to an embodiment of the present invention.
2D is another cross-sectional side view of a tunnel structure constructed by a tunnel structure construction method using a steel pipe in which a lead steel pipe is installed according to an embodiment of the present invention.
3 is a side cross-sectional view showing a base installation step in a tunnel structure construction method using a steel pipe in which a lead steel pipe is installed according to an embodiment of the present invention.
4A is a side cross-sectional view showing the first press-fitting step in the construction method of a tunnel structure using a steel pipe in which a lead steel pipe is installed according to an embodiment of the present invention.
4B is a front cross-sectional view showing the first press-fitting step in the construction method of a tunnel structure using a steel pipe in which a lead steel pipe is installed according to an embodiment of the present invention.
4C is a longitudinal cross-sectional view showing a steel pipe and a lead steel pipe in a tunnel structure construction method using a steel pipe in which a lead steel pipe is installed according to an embodiment of the present invention.
4D is a longitudinal cross-sectional view showing another steel pipe and a lead steel pipe in a tunnel structure construction method using a steel pipe in which a lead steel pipe is installed according to an embodiment of the present invention.
4E is a cross-sectional view of a steel pipe and a lead pipe in a tunnel structure construction method using a steel pipe in which a lead steel pipe is installed according to an embodiment of the present invention.
4F is a cross-sectional view of another steel pipe and a forward pipe in a tunnel structure construction method using a steel pipe in which a lead steel pipe is installed according to an embodiment of the present invention.
5 is a side cross-sectional view illustrating a first excavation step in a method for constructing a tunnel structure using a steel pipe in which a fresh steel pipe is installed according to an embodiment of the present invention.
6A is a side cross-sectional view showing a structure connection step in the construction method of a tunnel structure using a steel pipe in which a lead steel pipe is installed according to an embodiment of the present invention.
6B is a perspective view of a segmented structure used in a tunnel structure construction method using a steel pipe in which a lead steel pipe is installed according to an embodiment of the present invention.
7A is a side cross-sectional view illustrating a second press-fitting step in a method for constructing a tunnel structure using a steel pipe in which a lead steel pipe is installed according to an embodiment of the present invention.
7B is an enlarged side sectional view illustrating a steel pipe and a lead steel pipe in a tunnel structure construction method using a steel pipe in which a lead steel pipe is installed according to an embodiment of the present invention.
8A is a side cross-sectional view illustrating a structure insertion step in a tunnel structure construction method using a steel pipe in which a lead steel pipe is installed according to an embodiment of the present invention.
8B is a front cross-sectional view showing a structure insertion step in a tunnel structure construction method using a steel pipe in which a lead steel pipe is installed according to an embodiment of the present invention.
9A is a side cross-sectional view illustrating a second excavation step in a method for constructing a tunnel structure using a steel pipe in which a lead steel pipe is installed according to an embodiment of the present invention.
9B is a plan sectional view showing the second excavation step in the construction method of a tunnel structure using a steel pipe in which a lead steel pipe is installed according to an embodiment of the present invention.
10A is a side view illustrating a second connection step in the construction method of a tunnel structure using a steel pipe in which a lead steel pipe is installed according to an embodiment of the present invention.
10B is a side view illustrating a connection part of a segmented structure in a tunnel structure construction method using a steel pipe in which a lead steel pipe is installed according to an embodiment of the present invention;
10c is a plan cross-sectional view illustrating a connection part of a segmented structure in a tunnel structure construction method using a steel pipe in which a lead steel pipe is installed according to an embodiment of the present invention.
10D is a cross-sectional view illustrating a joint plate in a tunnel structure construction method using a steel pipe in which a lead steel pipe is installed according to an embodiment of the present invention.
10E is a front view showing a joint plate in a tunnel structure construction method using a steel pipe in which a lead steel pipe is installed according to an embodiment of the present invention.
11 is a side view of a tunnel structure constructed through a tunnel structure construction method using a steel pipe in which a lead steel pipe is installed according to an embodiment of the present invention.

Next, a preferred embodiment of a tunnel structure construction method using a steel pipe installed with a lead steel pipe according to the present invention will be described in detail with reference to the drawings.

Hereinafter, the same reference numerals are used for technical elements having the same function, and repeated detailed descriptions are omitted to avoid overlapping descriptions.

The examples described below are illustratively presented in order to effectively show the preferred embodiments of the present invention, and should not be construed to limit the scope of the present invention.

As shown in FIG. 1 , the method for constructing a tunnel structure using a steel pipe installed with a lead steel pipe according to an embodiment of the present invention includes a base installation step (S10), a first press-fitting step (S20), and a first excavation step (S30). ), a first connection step (S40), a second press-in step (S50), a structure insertion step (S60), a second excavation step (S70), a second connection step (S80), a repeating step (S90) ) is included.

As an example, the tunnel structure 1 constructed through the tunnel structure construction method using a steel pipe installed with a lead steel pipe according to an embodiment of the present invention is a tunnel having a T-shaped cross section as shown in FIGS. 2A and 2B . It can be a structure (1).

And as another example, it may be a tunnel structure (1) having a C-shaped cross section as shown in FIG. 2C.

Also, as another example, it may be a tunnel structure 1 having an arcuate cross section as shown in FIG. 2D .

The tunnel structure 1 may have various cross-sectional shapes in addition to the above-described cross-sectional shapes.

In order to construct the tunnel structure 1 through the tunnel structure construction method using the steel pipe in which the lead steel pipe is installed according to an embodiment of the present invention, the base installation step (S10) is first started.

3, in the base installation step (S10), the propulsion base 10 is installed at the starting point of the tunnel structure 1 construction section S, and the arrival base 12 is installed at the end point of the construction section S. .

The propulsion base 10 is formed by excavating the ground to a certain depth.

A reaction force wall 30 and a propulsion device 40 are installed inside the propulsion base 10 .

Here, the reaction wall 30 may be formed of a concrete structure, a beam structure, a steel structure, or the like.

And the propulsion device 40 may include one or several hydraulic jacks, and may be installed in front of the reaction wall 30 .

A retaining wall, a concrete floor, etc. may be further installed inside the propulsion base 10 .

On the other hand, the reaching base 12 is formed by excavating the ground to a certain depth, similar to the propulsion base 10 .

The retaining wall, the concrete floor, etc. may be installed inside the arrival base 12 .

When the base installation step (S10) as described above is finished, the first press-fitting step (S20) is started.

4A and 4B, in the first press-fitting step (S20), the propulsion device 40 propels the steel pipe 60 brought into the propulsion base 10, and the opposite side of the reaction wall 30 is underground. press into

Referring to FIG. 4C , a lead steel pipe 62 is installed inside the steel pipe 60 .

The lead steel pipe 62 is movably coupled to the inside of the steel pipe 60 in the longitudinal direction.

Here, the lead steel pipe 62 may be coupled to the outside of the steel pipe 60 as shown in FIG. 4D .

Referring to FIG. 4E , the steel pipe 60 and the lead steel pipe 62 have a circular cross-sectional shape.

Referring to FIG. 4F , the steel pipe 60 and the lead steel pipe 62 may have a rectangular cross-sectional shape.

And although not shown in the drawings, it is also possible to be formed in polygons such as pentagons, hexagons, and octagons.

The lead steel pipe 62 is formed with a sharp tip.

The lead steel pipe 62 may be propelled forward of the steel pipe 60 by using the lead propulsion device 64 inside the steel pipe 62 .

The lead propulsion device 64 may include one or a plurality of hydraulic jacks.

Meanwhile, in the press-fitting step (S20), one or two or more steel pipes 60 are press-fitted so that a plurality of steel pipes 60 are disposed in a shape corresponding to the cross-sectional shape of the tunnel structure 1 .

That is, the steel pipe 60 is arranged in a C shape, a T shape, a ㅁ shape, an arc shape, and the like.

When the first press-fitting step (S10) as described above is finished, the first excavation step (S30) is started.

Referring to FIG. 5 , in the first excavation step ( S30 ), excavated objects such as earth and sand positioned inside the steel pipe 60 press-fitted into the ground are dug into the propulsion base 10 .

The excavated object of the propulsion base 10 is carried out to the ground again.

When the first excavation step (S30) is finished, the first connection step (S40) is started.

Referring to FIGS. 6A and 6B , in the first connecting step ( S40 ), one of the segmented structures 2 that are connected to each other to form the tunnel structure 1 is connected and installed behind the steel pipe 60 .

The segmental structure 2 may be manufactured in advance at a factory and may have a form in which the tunnel structure 1 is divided by a predetermined length.

Here, the segmental structure 2 is made of reinforced concrete and is disposed between the reaction wall 30 and the steel pipe 60 .

The segmental structure (2) can be provided with a long cover (6) in the longitudinal direction so as to reduce the resistance when moving forward while in natural contact with the soil.

The cover 60 is made of metal, synthetic resin, etc., and when the cross section of the steel pipe 60 is circular, the cover 60 may be formed to have a continuous cross-sectional shape with an arch approximately the same as that of the steel pipe 60 .

The cover 60 may be formed so as to support and support a portion of the rear end surface of the steel pipe 60 from the rear of the steel pipe 60 when the segmental structure 2 is propelled.

When the first connection step (S40) is finished, the second press-fitting step (S50) is started.

7A and 7B, in the second press-fitting step (S50), the fresh propulsion device 64 propels the fresh steel pipe 62 to press-in the fresh steel pipe 62 into the ground in front of the steel pipe 60. make it

When the second pressing step (S50) is finished, the structure insertion step (S60) is started.

8A and 8B, in the structure insertion step (S60), the propulsion device 40 propels the segmented structure 2 installed at the rear of the steel pipe 60, and the segmented structure 2 and the steel pipe 60) move forward.

At this time, the segmental structure 2 moves to the position where the steel pipe 60 was while pushing the steel pipe 60 forward, the lead steel pipe 62 maintains its position, and the steel pipe 60 is a segmented structure ( 2) is pushed to the outside of the fresh steel pipe 62, and the fresh steel pipe 62 is positioned inside the steel pipe 60.

When the structure insertion step (S60) is finished, the second excavation step (S70) is started.

9A and 9B, in the second excavation step (S70), the inside of the segmented structure 2 and the steel pipe 60 are excavated.

That is, excavated objects such as earth and sand positioned inside the segmented structure 2 and inside the steel pipe 60 are dug into the propulsion base 10 .

Here, a discharge hole 61 may be formed at a lower side of the rear end of the steel pipe 60 to take out the excavated material to the outside.

When the second excavation step (S70) is finished, the second connection step (S80) is started.

Referring to FIG. 10 , in the second connecting step ( S80 ), another segmented structure 2 is connected and installed behind the segmented structure 2 .

In the above, the segmental structure 2 is connected by a joint plate 20 as shown in FIGS. 11A to 11cdp.

That is, when connecting two segmental structures 2 positioned in the front and rear, one side of one segmental structure 2 and one side of the joint plate 20 are screwed together, and one side of the other segmental structure 2 and the joint plate 20 ) and screw on the other side.

The joint plate 20 may be installed on the inner surface and/or the outer surface of the segment structure 2 .

One or several pieces of the joint plate 20 may be installed along the inner surface and/or outer circumference of the segmental structure 2 .

The segmental structure (2) is provided with an anchor bolt (24) and a nut (26) for screw fastening with the joint plate (20).

The joint plate 20 has on both sides bolt holes 22 through which the anchor bolt 26 passes.

Here, the bolt hole 22 provided on one side or both sides of the joint plate 20 may be a long hole which is perforated in an approximately oval shape in a horizontally long length.

When the bolt hole 22 is formed into a long hole as described above, the position at which the anchor bolt 26 is assembled to the bolt hole 22 can be adjusted, and thus the connection direction between the segment structures can be adjusted. A section or an inclined section can be easily formed.

When the second connection step (S80) is finished, the repeating step (S90) is started.

1 and 12, in the repeating step (S90), after the second connection step (S80), the second press-in step (S50), the structure insertion step (S60), and the second excavation step (S70) are performed. It is sequentially repeated until the segmental structure (2) located at the head reaches the reaching base (12).

In the above, a preferred embodiment of a tunnel structure construction method using a steel pipe in which a lead steel pipe is installed according to the present invention has been described, but the present invention is not limited thereto, and various modifications are made within the scope of the claims, the description of the invention, and the accompanying drawings. It is possible to implement it, and this also falls within the scope of the present invention.

1 : Tunnel structure 2 : Segmented structure
6: cover 10: propulsion base
12: Reach base 20: Joint plate
21: bolt hole 26: anchor bolt
30: reaction wall 40: propulsion device
60: steel pipe 62: fresh steel pipe
64: lead propulsion device

Claims (8)

A base installation step of installing a propulsion base at one end point of the tunnel structure construction section and installing an arrival base at the other end point of the tunnel structure construction section;
A first press-fitting step of pushing a plurality of steel pipes in which lead steel pipes are installed inside or outside, respectively, into the ground at the propulsion base and arranged in a shape corresponding to the cross-sectional shape of the tunnel structure to be built;
A first excavation step of excavating the soil inside the steel pipe;
A first connection step of connecting and installing a segmented structure that is manufactured in advance and connected in plurality to form the tunnel structure behind the steel pipe;
a second press-fitting step of pushing the fresh steel pipe into the ground;
A structure insertion step of pushing the segmented structure connected behind the steel pipe to move the segmented structure and the steel pipe forward;
a second excavation step of excavating soil from the inside of the segment structure and the fresh steel pipe;
a second connection step of connecting and installing another segmental structure behind the segmental structure;
A tunnel structure construction method using a steel pipe in which a lead steel pipe is installed in which the second press-in step, the structure insertion step, and the second excavation step are sequentially repeated after the second connection step.
The method according to claim 1,
The steel pipe is
Tunnel structure construction method using steel pipes with lead steel pipes arranged in any one of C (Digwan), T (T), ㅁ (Mieum), and arc shapes.
The method according to claim 1,
A tunnel structure construction method using a steel pipe in which the lead steel pipe is installed in the steel pipe and the lead steel pipe to form a circular cross-sectional shape.
The method according to claim 1,
The steel pipe and the lead steel pipe are a tunnel structure construction method using a steel pipe installed with a lead steel pipe that forms a rectangular or polygonal cross-sectional shape.
The method according to claim 1,
In the second connecting step, the segmented structure is connected through a joint plate, and a tunnel structure construction method using a steel pipe in which a lead steel pipe is installed in which both sides of the joint plate and the segmental structure are screwed.
6. The method of claim 5,
The segmental structure is provided with an anchor bolt and a nut for screw fastening with the joint plate,
The joint plate is provided with bolt holes on both sides through which the anchor bolt passes,
A tunnel structure construction method using a steel pipe in which a lead steel pipe made of a long hole in which the bolt holes provided on one or both sides of the joint plate are horizontally long.
The method according to claim 1,
The segmental structure is
A tunnel structure construction method using a steel pipe with a lead steel pipe having a cover on the outside to reduce resistance while in natural contact with soil during forward movement.
A tunnel structure constructed by the method of any one of claims 1 to 7.

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