KR20070095481A - Semi open cut type tunnel construction method at low overburden and arch type structure for tunnel construction - Google Patents

Semi open cut type tunnel construction method at low overburden and arch type structure for tunnel construction Download PDF

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Publication number
KR20070095481A
KR20070095481A KR1020050079922A KR20050079922A KR20070095481A KR 20070095481 A KR20070095481 A KR 20070095481A KR 1020050079922 A KR1020050079922 A KR 1020050079922A KR 20050079922 A KR20050079922 A KR 20050079922A KR 20070095481 A KR20070095481 A KR 20070095481A
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South Korea
Prior art keywords
tunnel
ground
tunnel construction
arch
arched
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KR1020050079922A
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Korean (ko)
Inventor
나상민
이상덕
이성진
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지에스건설 주식회사
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Priority to KR1020050079922A priority Critical patent/KR20070095481A/en
Publication of KR20070095481A publication Critical patent/KR20070095481A/en

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Abstract

A semi-open cut type tunnel construction method at low overburden and an arch-shaped structure for tunnel construction are provided to shorten the construction period and reduce the construction cost by excavating a tunnel by using an excavation construction method suitable for the lower ground of the arch-shaped structure against vibration. A semi-open cut type tunnel construction method comprises the steps of forming the bottom surface of cut ground by cutting the original ground by a predetermined depth. A previously manufactured arch-shaped structure is installed at the bottom surface of the cut ground. A refilling layer is formed by refilling soil in the upper portion of the arch-shaped structure. A tunnel is formed by excavating the ground below the arch-shaped structure.

Description

Semi open cut type tunnel construction method at low overburden and arch type structure for tunnel construction}

1 is a view showing the topography of the section in which the tunnel is installed.

Figure 2 is a cross-sectional view of the construction by the detachable method according to the prior art.

3a to 3d is a process diagram showing a process for constructing a tunnel by the tunnel construction method according to the present invention.

4 is a perspective view of the arched structure shown in FIGS. 3b and 3d.

<Description of Major Symbols in Drawing>

10: base 20: cut bottom surface

30: arch structure 31: arch H beam

32: earth plate 33: foundation

40: back layer 50: tunnel

The present invention relates to a method for constructing a tunnel in a toffee thin terrain, such as a downtown area, a tunnel shaft portion, a valley of a mountainous terrain, and an arched structure for tunnel construction, and more specifically, to excavate only to the point corresponding to the heavenly arch of the tunnel. The present invention relates to a semi-separable tunnel construction method and an arch structure for tunnel construction by installing an arch structure on the bottom surface of a cut and then excavating a tunnel.

In general, the excavation method of the tunnel is roughly divided into excavation method by explosive blasting or excavation method using mechanical excavation equipment such as TBM, and through such a method to build a tunnel while gradually increasing the depth depth of the tunnel .

In order to excavate a tunnel by such a conventional excavation method, the toffee layer on the upper part of the tunnel must be a certain thickness or more to secure the support force through the arching effect, so that the tunnel can be constructed without collapse.

However, as shown in FIG. 1, in the case of a thin toffee section such as the entrance and exit (A) and the valley portion (B) of the tunnel, the ground itself is not solid, so the tunnel construction is realistic with the above-described conventional excavation method. There was a difficult problem.

Thus, in the thin topi section, as shown in FIG. 2, the tunnel has been constructed through an open-type method that excavates to a portion corresponding to each part of the tunnel and constructs the tunnel structure and then backfills it.

However, in the conventional cladding method in which the construction is performed through the above-described process, when the construction of the ground is thick, the thickness of the lining concrete supporting the ground increases because a large stress acts on the ground. Therefore, it is practically difficult to manufacture and transport the lining concrete in advance in the factory. Therefore, in the site as described above, since the concrete must be poured and cured directly after laying the formwork and support, there is a problem that the quality control is difficult and the entire construction period according to the curing time is long.

And, because the excavation to each part of the tunnel is formed on both sides of the gravel slope, there is also a problem that the environmental damage occurs a lot of cut amount.

In addition, the lining concrete cannot be filled until the lining concrete is fully cured, so it is impossible to pass the vehicle over it, and other work on the ground cannot be performed. There is also the problem of creating a passageway.

On the other hand, the semi-adhesive tunnel construction method, which has been constructed in foreign countries, has the difficulty of excavating in the form of arch when excavating the upper part of the ceiling in order to cast the arch slab part into concrete. As the directional continuous structure, it was vulnerable to vibrations such as displacement and blasting during the excavation of the lower part, and there was a limitation in the soil quality of the target object. In addition, this method also has a problem in that the construction period is long because the cover and back excavation should be made after the concrete arch slab of the entire section is cured, as in the problem of the attachment method.

Accordingly, the present invention has been made to solve the conventional problems as described above, by excavating only the base to the point corresponding to the top end of the tunnel without excessive slope cutting and additional reinforcement and environmental destruction and slope due to excessive slope cutting The purpose of the present invention is to provide a semi-attached tunnel construction method and an arch structure for tunnel construction that can solve the stability problem.

In addition, by installing an arch structure consisting of a pre-fabricated arched H beam and earth plate, the arched structure can be individually reacted to the vibration by the lower tunnel excavation to form a structure that is resistant to vibration. After the excavation of the tunnel by the excavation method suitable for the lower ground of the arch structure, there is also an object of providing a semi-open tunnel construction method of the low toffee section and the arch structure for the tunnel construction that can reduce the cost by reducing the construction period.

In order to achieve the object as described above, the semi-adhesive tunnel construction method according to the present invention comprises the steps of cutting the ground to a certain depth to form a cut bottom surface, and the pre-fabricated arched structure in the cut bottom surface There are technical features, including the steps of installing, backfilling the soil to the top of the arched structure to form a backfill layer, and excavating the ground in the lower portion of the arched structure to form a tunnel shaft.

In the above-described tunnel construction method, the arcuate structure has a plurality of arcuate H-beams formed in an arc shape and spaced apart from the cut bottom, a plurality of earth plates densely sandwiched between the arcuate H-beams, and both ends of the arcuate H-beams. It includes a foundation that is capable of transmitting an acting load to the ground.

In order to achieve the object as described above, the arch structure for the half-opening tunnel construction according to the present invention is formed between the plurality of arcuate H-beams and arcuate H-beams which are formed in an arc shape and are spaced apart from the cut ground surface. It includes a plurality of earth plate to be densely fitted to the base, and the base to be able to transmit the load acting on both ends of the arc-shaped H beam to the ground.

Hereinafter, the characteristics of the above-described configurations and their functions will be described in more detail through the preferred embodiments of the semi-opened tunnel construction method and the arch structure for tunnel construction according to the present invention.

3A to 3D of the accompanying drawings are process drawings showing a process of constructing a tunnel by the tunnel construction method according to the present invention, and FIG. 4 is a perspective view of the arch structure shown in FIGS. 3B and 3D.

As shown, the tunnel between the low topi area according to an embodiment of the present invention, first cut the ground ground 10 to form the cut bottom surface 20 to form the cut bottom surface (S1), cut bottom surface Arched structure installation step (S2) to install the prefabricated arched structure 30 to the 20, and backfilling step (S3) to form a backfill layer 40 by filling the soil on the upper portion of the arched structure (30) And, it is constructed including a tunnel forming step (S4) to form a tunnel 50 by excavating the ground in the lower portion of the arcuate structure (30).

As shown in Figure 3a, the above-described cut bottom surface forming step (S1) is a process of cutting the base plate 10 of the topi thin section, such as the valley portion of the urban area or mountainous terrain using cutting equipment such as a fork lane.

As shown in Figure 3b, the above-described arched structure installation step (S2) is a process of installing the arched structure 30 on the cut bottom surface (20).

As shown in FIG. 4, the arcuate structure 30 used in this step includes a plurality of arcuate H-beams 31 that are arcuate and a plurality of earth plates 32 that are densely fitted between the arcuate H-beams 31. And a base portion 33 which supports both ends of the arc-shaped H beam 31 and transmits a load to the ground.

At this time, the base portion 33 serves to transfer the load acting on the arc-shaped H beam 31 as the reinforced concrete foundation to the ground.

And, since the earth plate 32 is smaller in thickness than the upper and lower widths of the grooves formed on the side of the arcuate H-beam 31, the arcuate H-beams 31 are provided at regular intervals therebetween the arcuate H-beams 31. Just insert it into the groove.

The arcuate structure 30 is manufactured in advance in the factory and then transported, it is only necessary to assemble in the workplace.

As shown in Figure 3c, the above backfill step (S3) is a process of forming the backfill layer 40 by filling the soil cut in the cut bottom surface forming step (S1) on top of the arcuate structure 30 again to be.

As shown in Figure 3d, the above-described tunnel forming step (S4) is a process of forming the final tunnel 50 by excavating the ground in the lower portion of the arcuate structure 30 using an excavation method suitable for the ground state.

At this time, the process of forming the final tunnel 50 includes the process of forming the shaft using the excavation method, and the process of constructing concrete lining on the inner surface and the bottom of the shaft.

As described above with reference to the accompanying drawings, the semi-attached tunnel construction method and the arch structure for the tunnel construction between the low topi section according to a preferred embodiment of the present invention, the present invention is described in detail herein with the embodiments and drawings It is not limited to, various modifications can be made within the scope of the technical idea of the invention. Hereinafter, examples that can be variously modified will be briefly described.

First, in the embodiment of the present invention, but the base is formed in an independent base form to support each of the arched H-beams, it may be formed in the form of an integral stem that is connected to each other depending on the ground conditions.

Second, if the ground of the cut bottom is weak, the reinforcing member may be put before installing the foundation and the foundation may be installed thereon. At this time, the reinforcing member can be firmly supported by the arcuate structure that is supported on the upper portion by the oblique direction. That is, since the stress of the arcuate structure supported on the upper side does not act vertically but obliquely in an oblique direction, it can effectively cope with this. The inclination angle of the reinforcing member is most preferably within the range of 20 ~ 28 ° with respect to the vertical. If the angle of inclination of the reinforcing member is less than 20 ° or exceeds 28 °, the arcuate structure cannot be firmly supported because it is different from the stress direction of the arcuate structure.

Third, the H beams may be connected by using a separate connecting member in order to prevent damage to the arch structure due to the uneven settlement of the arch H beam due to the lower excavation after the installation of the arch structure. At this time, the connecting members may be coupled to the H beam by welding or coupled by fastening means such as bolts and nuts. In addition, the connection members may be formed in various forms such as straight or cross.

Fourth, in the drawings of the present invention, but the shape of the upper portion of the arcuate structure and the final tunnel is shown in the same form, but not limited to this, but the width of the arched structure according to the conditions of the ground more than the upper width of the upper end tunnel It can also be formed wide.

Fifth, it is also possible to pre-fit a wire mesh for forming a concrete lining layer on the upper wall of the tunnel between the arch H beams before sandwiching the earth plates between the arch H beams, and then sandwich the earth plates between the arc H beams. It is also possible to cover the wire mesh on top of the arc-shaped H beam and to densely install the earth plates thereon.

According to the semi-opening tunnel construction method and the arch structure for tunnel construction of the low-pitched section of the present invention configured as described above, by excavating only the ground to the point corresponding to the top end of the tunnel without excessive slope cutting and additional reinforcement, Environmental destruction and slope stability problems caused by cutting can be solved.

According to the present invention, by using the arch structure consisting of a pre-fabricated arch H-beam, earth plate and foundation, it is possible to expect the convenience of the construction as well as the effect of shortening the air, the construction is assembled to each other in the state in which the arch structures are separated from each other By doing so, it is possible to form a structure that is resistant to vibration by reacting individually instead of integrally reacting to the vibration caused by the lower tunnel excavation.

According to the present invention, since the binary structure is not a structure that needs to be cured like concrete, the backfill process of filling the soil on the upper portion of the arched structure and the process of excavating the ground in the lower portion of the arched structure can be simultaneously performed at regular intervals. The construction period can be shortened.

According to the present invention, after the arch structure is installed, the soil cut into the upper part is refilled, so that the vehicle can pass to the ground even during the construction of the tunnel, so that other operations performed on the ground can be performed.

According to the present invention, the arcuate structure is formed by including the arcuate H-beams are installed at regular intervals and the earth plate is densely sandwiched therebetween, the arching effect of the ground in the longitudinal and transverse direction is expressed to increase the upper load of the arched structure You can alleviate the foundation reinforcement by mitigating.

According to the present invention, it is possible to expect the improvement of workability by excavating flat bottom surface without digging in the shape of an arch.

Claims (8)

  1. In the method of constructing a tunnel with a thin section of toffee, such as a downtown area, a tunnel shaft part, and a mountain valley part,
    Cutting the ground to a certain depth to form a cut bottom surface;
    Installing a prefabricated arch structure on the cut bottom surface;
    Forming a backfill layer by filling the soil back on top of the arcuate structure; And
    Semi excavated tunnel construction method comprising the step of excavating the ground in the lower portion of the arcuate structure to form a tunnel.
  2. The method of claim 1,
    The arch structure,
    A plurality of arcuate H beams formed in an arc shape and spaced apart from the cut bottom;
    A plurality of earth plates densely sandwiched between the arcuate H beams; And
    Semi-open tunnel construction method of the low toffee section, characterized in that it comprises a base for transmitting the load acting on both ends of the arc-shaped H beam to the ground.
  3. In the arch structure for constructing a tunnel of thin toffee section, such as urban area, tunnel shaft part, mountain valley part,
    A plurality of arched H beams formed in an arc shape and spaced apart from the cut ground surface;
    A plurality of earth plates densely sandwiched between the arcuate H beams; And
    Arched structure for semi-attached tunnel construction of the low toffee section, characterized in that it comprises a base that can transmit the load acting on both ends of the arc-shaped H beam to the ground.
  4. The method of claim 3, wherein
    The base portion is formed in the form of an independent foundation arched structure for semi-attached tunnel construction of the low toffee section, characterized in that made to support each of the arched H-beams.
  5. The method of claim 3, wherein
    The base portion is formed in the shape of a stem grass arch structure for a semi-open tunnel construction of a low topi section, characterized in that made to support a plurality of arc-shaped H beams at the same time.
  6. The method of claim 3, wherein
    The arched structure for semi-open tunnel construction between the low topi, characterized in that further comprising a connecting member for connecting the arched H-beams to each other so that the arched structure is not damaged by inequality.
  7. The method of claim 3, wherein
    Arched structure for semi-attached tunnel construction of the low toffee section, characterized in that further comprising a wire mesh fitted between the arcuate H beams before sandwiching the earth plate between the arcuate H beams.
  8. The method according to any one of claims 3 to 7,
    Arched structure for semi-attached tunnel construction of the low toffee section, characterized in that it further comprises a reinforcing member driven to the ground before installing the base portion to support the base portion.
KR1020050079922A 2005-08-30 2005-08-30 Semi open cut type tunnel construction method at low overburden and arch type structure for tunnel construction KR20070095481A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102182465A (en) * 2011-04-01 2011-09-14 长安大学 Tunnel-entering construction method for tunnel
CN103590836A (en) * 2013-11-26 2014-02-19 中铁第四勘察设计院集团有限公司 Method for processing tunnel collapse caused by shallow-buried excavation
CN104806271A (en) * 2015-05-15 2015-07-29 湖南科技大学 Precutting-groove U-shaped steel bracket with automatic propelling function and construction method thereof
CN107060778A (en) * 2017-06-15 2017-08-18 中铁十局集团第五工程有限公司 Pass through high-rise building group back filled region method for tunnel construction

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102182465A (en) * 2011-04-01 2011-09-14 长安大学 Tunnel-entering construction method for tunnel
CN103590836A (en) * 2013-11-26 2014-02-19 中铁第四勘察设计院集团有限公司 Method for processing tunnel collapse caused by shallow-buried excavation
CN104806271A (en) * 2015-05-15 2015-07-29 湖南科技大学 Precutting-groove U-shaped steel bracket with automatic propelling function and construction method thereof
CN107060778A (en) * 2017-06-15 2017-08-18 中铁十局集团第五工程有限公司 Pass through high-rise building group back filled region method for tunnel construction

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