JP5022150B2 - Tunnel merge structure and method for constructing tunnel merge structure - Google Patents

Tunnel merge structure and method for constructing tunnel merge structure Download PDF

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JP5022150B2
JP5022150B2 JP2007228908A JP2007228908A JP5022150B2 JP 5022150 B2 JP5022150 B2 JP 5022150B2 JP 2007228908 A JP2007228908 A JP 2007228908A JP 2007228908 A JP2007228908 A JP 2007228908A JP 5022150 B2 JP5022150 B2 JP 5022150B2
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tunnel
shield
portion
beam
providing
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JP2009062682A (en
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幸信 佐々木
正義 奥山
剛史 安部
均 荒木
義正 須山
公城 高橋
浩一 鶴田
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鹿島建設株式会社
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Description

The present invention relates to a tunnel merging structure constructed by connecting a pair of tunnels, and a tunnel merging section construction method.

Conventionally, in order to construct a tunnel junction, a method for constructing a tunnel junction by cutting from above the junction has been performed. However, in this method, there is a problem that construction is restricted if there is a road or a structure or the like above the junction. On the other hand, there is a method of connecting a plurality of tunnels such as a main line tunnel and a ramp tunnel from the inside of the tunnel to construct a tunnel junction.

As a method of constructing such a tunnel junction, for example, a main tunnel and a ramp tunnel are connected in a ring shape with a pipe roof, a part surrounded by the pipe roof is excavated, and the inside of the pipe roof is covered There is a method for constructing a junction (Patent Document 1). Further, there is a tunnel merging and branching structure in which a pair of shield tunnels is excavated, a connecting portion that connects both tunnels is provided, and a PC steel wire is disposed around both tunnels and the connecting portion (Patent Document 2).
JP 2004-353264 A JP 2005-68861 A

However, in the construction method of the tunnel junction part of Patent Document 1, a large earth pressure is applied to the upper surface of the pipe roof, but there is a problem that the strength of the connecting part cannot be secured if the pipe diameter used for the pipe roof is small. In addition, when a large-diameter pipe is used, there is a problem in that it cannot penetrate between the main beams of the segments. In addition, there is a problem that it is necessary to provide a pipe roof over the entire length of the merging portion, which requires man-hours.

In the tunnel junction / branch structure disclosed in Patent Document 2, since a large earth pressure is applied to the upper plate of the connecting portion, it is necessary to ensure the thickness of the upper plate. If it is too low for the plate, it is difficult to join the upper plate and the segment, and there is a problem that a large stress concentration occurs in the joint. Also, if the upper plate is too large, there is a problem that it cannot pass between the main digits of the segment from within the tunnel. In addition, there is a problem that a special segment is required at the joint between the upper plate and the bottom plate.

The present invention has been made in view of such problems, and in the case of constructing a junction part of a tunnel, it has sufficient strength and can smoothly transmit stress, and an economical tunnel junction structure and tunnel. It aims at providing the construction method of a merge structure.

In order to achieve the above-described object, the first invention provides a first tunnel, a second tunnel adjacent to the first tunnel, and between the first tunnel and the second tunnel. An arch-shaped beam provided at an upper portion and having a curvature at an outer peripheral portion larger than a curvature at an inner peripheral portion; and a tension member that joins the first tunnel and the second tunnel . A tunnel junction structure is characterized in that the second tunnel and the second tunnel are connected by a connecting portion using the arched beam as a roof.

  A steel plate is provided at a connection portion between the first tunnel and the second tunnel and the arched beam, and between the first tunnel and the second tunnel and the steel plate, Concrete may be cast.

According to the first invention, since it has a connecting portion that uses an arch-shaped beam as a roof where the curvature of the outer peripheral portion is larger than the curvature of the inner peripheral portion, it can withstand earth pressure from above due to a high arch effect, In addition, since the thickness of the joint between the beam and the segment can be adjusted to the digit height of the segment, the stress transfer at the joint is smooth, no stress concentration part is generated, and the joint is separated from the segment ring. Therefore, it is not necessary to use a special segment, and it is possible to increase the thickness of only the part where the force acts on the segment ring. Since the member is provided, it is possible to provide a tunnel merging structure that can be opposed to a force that attempts to expand the space between the tunnels by a force applied to the arched beam from above.

The second invention includes a step (a) of constructing a first tunnel and a second tunnel provided alongside the first tunnel, and a step of providing a first junction inside the first tunnel (b ), A step (c) of providing a second junction inside the second tunnel, and a curvature of the outer circumference connecting the first junction and the second junction. A step (d) of providing an arch-shaped beam larger than the ratio, a step (j) of providing a tensile member for joining the first tunnel and the second tunnel, the first tunnel and the second And a step (e) of connecting the tunnel with a connecting portion using the arched beam as a roof.

The step (b) of providing the first joint portion includes a step (f) of providing a first steel plate on the inner surface of the first tunnel, and a concrete between the first steel plate and the first tunnel. And the step (c) of providing the second joint portion includes the step (h) of providing a second steel plate on the inner surface of the second tunnel. And (i) placing concrete between the second steel plate and the second tunnel.

  When placing concrete in the step (g) and / or the step (i), a screw rebar or the like may be embedded in the concrete. Further, in the step (d) of providing the arched beam, a plate member may be attached to the inner surface of the first tunnel and / or the second tunnel below the arched beam.

According to the second aspect of the present invention, since it has a connecting portion having an arch-shaped beam whose roof is larger than the curvature of the inner peripheral portion, it can withstand earth pressure from above due to its high arch effect. In addition, the thickness of the joint between the beam and the segment can be matched to the digit height of the segment, and the joint between the beam and the joint is performed by a pre-embedded screw rebar, etc. Because the joint is provided separately from the segment ring, there is no need to use a special segment, and the thickness of the part where the force acts on the segment ring can be increased by the sandwich structure with steel plates. It is economical because there is no need to raise the overall girder height of the segment, and by attaching an iron plate to the inner surface of the tunnel below the beam, earth and sand from the outside of the tunnel into the tunnel Working for the fall can be prevented can be provided on how to build a tunnel confluence structure is easy.

According to the present invention, it is possible to provide an economical tunnel merging structure and a method for constructing a tunnel merging structure that are capable of smoothly transmitting stress when constructing a merging portion of a tunnel. it can.

Hereinafter, embodiments of the present invention will be described in detail. FIGS. 1-10 is the figure which showed the construction process of the tunnel merge structure which concerns on this Embodiment. First, as shown in FIG. 1, the main line shield 1 is constructed by a shield machine. The segment 7 constituting the main line shield 1 does not require the use of a special segment or the like, and a general steel segment or synthetic segment can be used.

A steel material or a reinforcing bar 4 is provided on the upper inner surface of the main shield 1 so that one end is slightly inclined upward and the upward end is positioned in the vicinity of the top of the main shield 1. A steel plate 3 is provided on the inner surface of the reinforcing bar 4. The steel material or rebar 4 and the steel plate 3 are joined by direct welding or the like to the segment 7 constituting the main shield 1 with the side where a lamp shield described later is provided facing upward.

Next, as shown in FIG. 2A, concrete 5 a is placed between the steel plate 3 and the main shield 1. For placing the concrete 5a, the steel plate 3 is used as a mold, and the concrete 5a is also placed in the segment 7 where the steel plate 3 is joined. Therefore, this range is a structure in which the concrete 5a is sandwiched between the steel skin plate of the segment 31 (not shown) and the steel plate 3.

FIG. 2B is an enlarged view of a portion A in FIG. At the time of placing the concrete 5a, as shown in FIG. 2 (b), a pair of threaded reinforcing bars 11a and 11b are embedded in the vicinity of the end portion on the side facing the upper side of the steel material or the reinforcing bar 4. The screw rebar 11a is embedded in the concrete 5a at the top of the steel plate 3. The screw rebar 11b is joined to the end of the steel material or the rebar 4 and is embedded in the concrete 5a.

Both the screw rebars 11a and 11b protrude from the concrete 5a and are directed in the joining direction with an arch member described later. A portion constituted by the segment 7, the steel plate 3, the steel material or the reinforcing bar 4, the concrete 5a, and the threaded reinforcing bars 11a and 11b becomes a joint 9 with the upper beam described later. The joint portion 9 has a thickest structure near the center between the segment 7 and the steel plate 3.

Next, as shown in FIG. 3A, a lamp shield 13 is provided on the side of the main line shield 1. The lamp shield 13 is provided in the same axial direction as the main shield 1 by a shield machine. In addition, the segment which comprises the lamp shield 13 can use a normal steel segment and a synthetic | combination segment similarly to the main line shield 1. FIG.

On the upper inner surface of the lamp shield 13, as with the main shield 1, a steel plate 15, a steel material or a reinforcing bar 16 is inclined slightly upward on the main shield 1 side, and the end directed upward is near the approximate apex of the lamp shield 13. It is provided so that it may be located. The steel plate 15 and the steel material or the reinforcing bar 16 are joined to the segments constituting the lamp shield 13 by direct welding or the like. Similar to the main shield 1, concrete 5 b is placed between the steel plate 15 and the steel material or reinforcing bar 16 and the lamp shield 13 using the steel plate 15 as a mold.

FIG.3 (b) is the B section enlarged view of Fig.3 (a). As shown in FIG. 3B, a pair of screw rebars 11 c and 11 d are embedded in the end of the steel material or the reinforcing bar 16 on the main line shield 1 side as in the main line shield 1. Similar to the main wire shield 1, the portion constituted by the steel plate 15, the steel or reinforcing bar 16, the concrete 5 b and the threaded reinforcing bars 11 c and 11 d becomes a joint 17 with the upper beam described later. The joint portion 17 has a thickest structure near the center between the segment 7 and the steel plate 15. In the following description, detailed description on the lamp shield 13 side will be omitted for the same configuration and process as those of the main line shield 1.

When the ground around the main line shield 1 and the lamp shield 13 is a water-permeable layer, a water-stopping chemical injection 19 is applied to the ground of the target site from the main line shield 1 and the lamp shield 13 in advance. In FIG. 3, as an example, water-stopping chemical injections 19 a and 19 b are provided below the main line shield 1 and the lamp shield 13 so as to reach an impermeable layer (not shown), and the water-stopping chemical injection is provided outside the main line shield 1 and the lamp shield 13. In the state where 19c and 19d are provided, and the upper part of the main line shield 1 and the lamp shield 13 is a water permeable layer, a water stopping chemical injection 19e can be provided on the upper ground. In the subsequent drawings, illustration of the water-stopping chemical injections 19a, 19b, 19c, 19d, and 19e is omitted.

Next, as shown in FIG. 4, the upper ground between the main shield 1 and the lamp shield 13 is excavated into an arch shape corresponding to the shape of the upper beam 51 described later. The excavation is performed from the inside of each shield by removing the skin plate (not shown) of the segment 7 corresponding to the excavation part of the main line shield 1 and the lamp shield 13. Under the present circumstances, the iron plate 21 is affixed on the inner surface of the main shield 1 of the part adjacent to the steel plate 3. FIG. The iron plate 21 can prevent earth and sand from falling from the excavation part into the main line shield 1. Similarly, the lamp shield 13 has an iron plate 22 attached to the inner surface of a portion adjacent to the steel plate 15.

A temporary wall 25 is provided inside the main line shield 1. The temporary wall 25 is used to partition the construction work field 27 of the main line shield 1 from other parts. The temporary wall 25 and the iron plate 21 allow other constructions in the space other than the construction workshop 27 in the main line shield 1 to be carried out separately. In addition, if paving work has already been carried out, etc. You can proceed with the construction of the tunnel merge section. In addition, you may provide the temporary wall 25 also in the lamp shield 13 as needed.

A temporary bottom plate 23 is provided below the excavated space between the main line shield 1 and the lamp shield 13. The temporary bottom plate 23 is used as a work floor when performing the upper beam installation work between the main line shield 1 and the lamp shield 13, and the main line shield 1 and the lamp shield 13 are caused by earth pressure from the outside. It also has a function to prevent it from coming inward.

Next, as shown in FIG. 5A, an upper arch portion 29 is provided. The upper arch part 29 is comprised with the arch-shaped iron plate, steel, etc., and is provided along the excavated upper surface. When the upper arch portion 29 is constructed, a support 35 is used as necessary, and a working scaffold (not shown) is separately provided.

FIG. 5B is an enlarged view of a portion A in FIG. As shown in FIG. 5B, a screw 31 is provided at the end of the upper arch portion 29, and the screw 31 and the screw rebar 711 are joined by a joint 39. That is, the upper arch portion 29 is joined to the main shield 1. As described above, the screw rebar 11a is embedded in the concrete 5a in advance in the joining direction with the upper arch portion 29.

The upper arch portion 29 is also joined to the lamp shield 13 in the same manner as the joining method to the main line shield 1. Therefore, the upper arch part 29 is joined to the main line shield 1 and the lamp shield 13 at both ends, and is provided in an arch shape. The back surface of the upper arch portion 29 (a gap with the ground) is filled with a filler 37. As the filler 37, for example, mortar or concrete can be used.

Next, as shown in FIG. 6, a lower arch portion 45 and a tension member 43 are provided. Similarly to the upper arch portion 29, the lower arch portion 45 is made of an arched iron plate and steel, but has a slightly larger curvature than the upper arch portion 29. The lower arch portion 45 is provided at a lower portion (inner surface direction) of the upper arch portion 29 with a space from the upper arch portion 29, and is joined by the upper arch portion 29 and the reinforcing bar 49. At this time, a part of the support work 35 can also be used as a reinforcing bar 49 that connects the upper arch portion 29 and the lower arch portion 45. The curvature of the upper arch portion 29 and the lower arch portion 45 will be described later.

FIG. 6B is an enlarged view of a portion A in FIG. As shown in FIG. 6B, a screw 47 is provided at the end of the lower arch portion 45, and the screw 47 and the screw rebar 11 b are joined by a joint 39. That is, the lower arch portion 45 is joined to the main shield 1. As described above, the threaded reinforcing bar 11b is embedded in the concrete 5a in advance in the direction of joining with the lower arch portion 45.

Further, the lower arch portion 45 is also joined to the lamp shield 13 in the same manner as the joining method to the main line shield 1. Accordingly, the lower arch portion 45 is provided in an arch shape with both ends joined to the main line shield 1 and the lamp shield 13.

The tension member 43 joins the main line shield 1 and the lamp shield 13. As shown in FIG. 6B, a joint 41 is provided at the end of the tension member 43. One end of the joint 41 is joined to the tension member 43, and the other is joined to the segment 7 constituting the main shield 1. The other end of the tension member 43 is joined to the lamp shield 13 in the same manner as the joining method to the main line shield 1. According to the tension member 43, the force by which the main line shield 1 and the lamp shield 13 are pushed outward can be restrained by the earth pressure from the upper part to the arch-shaped upper beam 51 described later. Although the material of the tension member 43 is not specified, for example, a steel frame, a reinforcing bar, a PC steel wire or the like can be used.

Next, as shown in FIG. 7A, concrete 5 c is placed between the upper arch portion 29 and the lower arch portion 45. When the concrete 5c is placed, the upper arch portion 29 and the lower arch portion 45 have a function as a mold. Hereinafter, a structure constructed by placing concrete 5 c between the upper arch portion 29 and the lower arch portion 45 is referred to as an upper beam 51.

FIG.7 (b) is the C section enlarged view of Fig.7 (a). As shown in FIG. 7 (b), the curvature of the outer periphery and inner periphery of the upper beam 51, ie, the outer periphery curvature 53 of the beam and the inner periphery curvature 55 of the beam, are the upper arch portion 29 and the lower arch portion 45, respectively. Of curvature. Here, the beam outer periphery curvature 53 of the upper beam 51 is smaller than the beam inner periphery curvature 55. Therefore, the upper beam 51 has a shape in which the thickness near the center of the upper beam 51 is thick and becomes thinner toward the end.

The reason why the upper beam 51 is formed as described above is as follows. The arch-shaped upper beam 51 can obtain the effect of a higher arch shape by increasing the arch height, and can obtain a high strength against the earth pressure from the upper part. Moreover, higher strength can be obtained by increasing the thickness of the substantially central portion of the upper beam 51, which is the portion that receives the greatest bending moment upon receiving earth pressure from the upper part.

However, if the entire upper beam 51 is made thicker and the arch height is made higher, the upper beam 51 becomes larger and construction becomes difficult, which is disadvantageous in terms of cost. Further, for example, the thickness of the joint 9 of the main shield 1 to be joined to the upper beam 51 is determined by the thickness of the segment 7 constituting the main shield 1. However, if the thickness of the upper beam 51 and the thickness of the segment 7 (thickness of the joint 9 of the main shield 1) are greatly different, the force received by the upper beam 51 is not smoothly transmitted to the main shield 1, There is a risk of stress concentration in the vicinity of the joint 9. Therefore, it is desirable that the thickness of the upper beam 51 and the thickness of the segment 7 are as equal as possible. However, the use of the segment 7 having a thickness greater than necessary or the use of a special segment having a different thickness has an economic problem.

Therefore, by making the beam outer periphery curvature 53 of the upper beam 51 smaller than the beam inner periphery curvature 55, the thickness near the center of the upper beam 51 receiving the most force is secured, and the thickness direction of the upper beam 51 is also increased. Since the arch height determined by the neutral line can be secured, and the end of the upper beam 51 can be made substantially the same thickness as the segment 7, the stress concentration in the connecting portion 9 is suppressed, and a special It is possible to ensure the strength without using a segment that is thicker than necessary or a segment that is thicker than necessary.

Next, as shown in FIG. 8, the temporary bottom plate 23 and the support work 35 are removed, and the lower ground between the main line shield 1 and the lamp shield 13 is excavated into a shape corresponding to the shape of the lower beam 59 described later. . The excavation is performed from the inside of each shield by removing the skin plate (not shown) of the segment 7 corresponding to the excavation part of the main line shield 1 and the lamp shield 13.

Next, as shown in FIG. 9, a lower beam 59 is provided below the excavated main line shield 1 and the lamp shield 13. The lower beam 59 is constructed by placing concrete 5d after the reinforcing bars 57 are provided. The lower beam 59 is made of ordinary reinforced concrete, but may have the same structure as the upper beam 51. In this case, what is necessary is just to reverse the vertical relationship of the upper arch part 29, the lower arch part 45, etc. which comprise the upper beam 51. FIG. After the lower beam 59 is constructed, the segment corresponding to the area excavated from the main shield 1 and the lamp shield 13 (D portion in the figure) is removed.

FIG. 10 is a diagram illustrating a state in which the segment of the portion D in FIG. 9 described above and the temporary wall 25 are removed and the pavement 61 is applied as necessary. The main line shield 1 and the lamp shield 13 are communicated with each other by a connecting portion 63 having the upper beam 51 as a roof, and a tunnel junction structure is constructed.

As described above, according to the method for constructing a tunnel merging structure according to the present embodiment, the roof of the connecting portion 63 that is the tunnel merging portion is the arch-shaped upper beam 51, so that a large earth pressure from above is applied. The tunnel junction structure which can be opposed to each other and is stable in strength can be easily constructed.

Moreover, since the beam outer periphery curvature 53 of the upper beam 51 is smaller than the beam inner periphery curvature 55, the thickness near the center of the upper beam 51 that receives the most force can be secured. For this reason, the upper beam 51 can ensure a large strength. In addition, since the arch height of the upper beam 51 is determined by a neutral line in the thickness direction of the upper beam 51, by reducing the beam outer periphery curvature 53, the arch is substantially higher than the beam shape having a constant thickness. The height can be secured, and the effect of improving the strength by the larger arch shape can be obtained.

In addition, since the end of the upper beam 51 can have substantially the same thickness as the segment 7, the stress concentration in the connecting portion 9 is suppressed, and without using a special segment or a segment that is thicker than necessary, Strength can be secured. Moreover, since the connection parts 9 and 17 connected to the upper beam 51 have a structure in which the concrete 5 a and 5 b are sandwiched between the segment 7 and the steel plates 3 and 15, it is possible to ensure high strength. Furthermore, since the thickness of the connection parts 9 and 17 near the center part of the connection part 9 and 17 which receives the largest moment by the force from the upper beam 51 is thick, it is sufficient without changing the thickness of the segment. Strength can be obtained.

Further, the tension member 43 can oppose the force that the main line shield 1 and the lamp shield 13 are pushed outward by the earth pressure received by the upper beam 51 from above, and can restrain the tunnel.

In addition, since the screw rebars 11 and the like are embedded in the joint portions 9 and 17 for joining to the upper beam 51 and joined by the joint 39, the joining is simple and high positional accuracy is not required. It can be constructed efficiently.

Moreover, since the iron plates 21 and 22 are affixed to the shield inner surface below the upper beam 51, it is possible to prevent earth and sand from being excavated outside the shield from falling into the shield. The upper arch portion 29 and the lower arch portion 45 used for the upper beam 51 and the steel plates 3 and 15 used for the connection portions 9 and 17 have a function as a strength member and are provided with concrete 5a and 5b. Since it is used also as a formwork at the time of carrying out, high construction efficiency can be obtained.

As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

For example, in this embodiment, the tunnel merge structure is constructed from the top to the bottom, but depending on the ground, the construction may be performed in the reverse order from this embodiment from the bottom to the top. Also good.

The figure which shows the state which provided the steel plate 3, the steel material, or the reinforcing bar 4 in the main line shield 1. FIG. It is a figure which shows the state which laid concrete 5a between the main line shield 1 and the steel plate 3, (a) is a general view, (b) is the A section enlarged view. It is a figure which shows the state which provided the lamp shield 13 side by side with the main line shield 1, (a) is a general view, (b) is the B section enlarged view. The figure which shows the state which excavated the upper part between the main line shield 1 and the lamp shield 13. FIG. It is a figure which shows the state which provided the upper arch part 29 in the upper part between the main line shield 1 and the lamp shield 13, (a) is a general view, (b) is an A section enlarged view. It is a figure which shows the state which provided the lower arch part 45 in the lower part of the upper arch part 29, (a) is a general view, (b) is the A section enlarged view. It is a figure which shows the state which laid concrete 5c between the upper arch part 29 and the lower arch part 45, and provided the upper beam 51, (a) is a general view, (b) is the C section enlarged view. The figure which shows the state which excavated between the main line shield 1 and the lamp shield 13. FIG. The figure which shows the state which provided the lower beam 59 in the lower part between the main line shield 1 and the lamp shield 13. FIG. The figure which removes the segment between the main line shield 1 and the lamp shield 13, and shows the state which the main line shield 1 and the lamp shield 13 were connected by the connection part 63. FIG.

Explanation of symbols

1 ......... Main line shield 3 ......... Steel 4 ......... Steel or rebar 5 ......... Concrete 7 ......... Segment 9 ......... Joint 11 ...... Threaded rebar 13 ......... Lamp shield 15 ......... Steel plate 16 ... Steel or rebar 17 ... Joint 19 ... Water-stopping chemical injections 21 and 22 ... Steel plate 23 ... Temporary bottom plate 25 ... Temporary wall 27 ... Construction site 29 ... ... Upper arch part 31 ......... Screw 35 ......... Supporting work 37 ......... Filler 39 ......... Fitting 41 ......... Joint 43 ......... Tension member 45 ......... Lower arch part 47 ......... Screw 49 ..... Reinforcing bar 51 .... Upper beam 53 ....... Beam outer circumference curvature 55 ....... Beam inner circumference curvature 57 ....... Reinforcement 59 ...... Lower beam 61 ...... Pavement 63 ...... Connecting part

Claims (7)

  1. The first tunnel,
    A second tunnel attached to the first tunnel;
    An arch-shaped beam provided at an upper portion between the first tunnel and the second tunnel, the curvature of the outer peripheral portion being larger than the curvature of the inner peripheral portion;
    A tension member that joins the first tunnel and the second tunnel;
    Comprising
    A tunnel merging structure, wherein the first tunnel and the second tunnel are connected by a connecting portion having the arched beam as a roof.
  2. A steel plate is provided at a connection portion between the first tunnel and the second tunnel and the arched beam, and between the first tunnel and the second tunnel and the steel plate, tunnel merging structure according to claim 1, wherein the concrete is pouring.
  3. A step (a) of constructing a first tunnel and a second tunnel attached to the first tunnel;
    Providing a first junction inside the first tunnel (b);
    Providing a second junction inside the second tunnel (c);
    A step (d) of providing an arched beam connecting the first joint and the second joint, the curvature of the outer peripheral portion being larger than the locality of the inner peripheral portion;
    Providing a tension member for joining the first tunnel and the second tunnel (j);
    A step (e) of connecting the first tunnel and the second tunnel with a connecting portion having the arched beam as a roof;
    A method for constructing a tunnel junction.
  4. The step (b) of providing the first joint portion includes:
    Providing a first steel plate on the inner surface of the first tunnel (f);
    Placing concrete between the first steel plate and the first tunnel (g);
    The method of constructing a tunnel junction according to claim 3 , comprising:
  5. The step (c) of providing the second joint portion includes:
    Providing a second steel plate on the inner surface of the second tunnel (h);
    Placing concrete between the second steel plate and the second tunnel (i);
    The method for constructing a tunnel junction according to claim 3 or 4 , characterized by comprising:
  6. 6. The method for constructing a tunnel joining portion according to claim 4 or 5 , wherein a screw rebar is embedded in the concrete when placing the concrete in the step (g) and / or the step (i).
  7. In step (d) of providing the arched beams, claim 3, characterized in that paste the first tunnel and / or the second inner surface on the plate member of the tunnel below the arched beams A method for constructing a tunnel junction according to any one of claims 1 to 6 .
JP2007228908A 2007-09-04 2007-09-04 Tunnel merge structure and method for constructing tunnel merge structure Active JP5022150B2 (en)

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JP5547552B2 (en) * 2010-05-20 2014-07-16 首都高速道路株式会社 Widening structure of shield tunnel and its construction method
CN102748040B (en) * 2012-07-23 2014-09-17 中铁一局集团有限公司 Main structure for metro long-span station and pillar arching construction method thereof

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DE1608527B1 (en) * 1964-10-13 1970-05-21 Kloenne Aug Fa Underground structure
JP2520036B2 (en) * 1990-01-29 1996-07-31 清水建設株式会社 Construction method of large section underground cavity and large section tunnel
JPH0781489B2 (en) * 1990-05-10 1995-08-30 株式会社奥村組 Tunnel construction method and device
JPH06102955B2 (en) * 1991-05-20 1994-12-14 エス・ティ・ケイ株式会社 Intermediate lining structure of the tunnel
JP2001295597A (en) * 2000-04-13 2001-10-26 Fujimi Koken Kk Reinforced structure of tunnel lining using nonuniform section arch member
JP4493936B2 (en) * 2003-05-28 2010-06-30 鹿島建設株式会社 Method for constructing tunnel junction and tunnel junction
JP2006194003A (en) * 2005-01-14 2006-07-27 Hitachi Zosen Corp Shielding machine
JP2006322222A (en) * 2005-05-19 2006-11-30 Kajima Corp Construction method of large-sectional tunnel

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