JP2009138389A - Supporting member, and construction method for widened section of tunnel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a segment which secures the strength of a joint section between a concrete skeleton provided in the lateral direction of a tunnel and a segment ring constituting the tunnel, for example, in the case of the widening of the tunnel, which is superior in workability and which dispenses with a meltdown operation etc., and a method for joining the segment and the concrete skeleton together. <P>SOLUTION: The segment 1 is used with a skin plate 5 during the construction of the tunnel. In the construction of the concrete skeleton, the skin plate 5 is removed: a steel plate 31 with holes 35 and 37 is provided; and the supporting member 30 is constructed. The holes 35 and 37 are provided through the segment 1, and reinforcements for the concrete skeleton and the like are provided in a penetrating manner in the holes 35 and 37 in connection to the concrete skeleton, respectively. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a support member used at a joint portion between a concrete frame provided on a side of a tunnel and a segment ring constituting the tunnel, and a method for constructing a tunnel widening portion, when the tunnel is widened. .

Conventionally, as a method of constructing a junction of an expressway having a tunnel, after providing a shield tunnel, a partial opening is provided in the shield tunnel of the junction, and a concrete frame is separately provided in the opening, A method of connecting a space formed by a frame and a tunnel is taken. It is necessary to process the segment at the joint portion with the concrete frame at the time of the joint construction with the concrete frame.

FIG. 8 is a perspective view showing a steel segment 70 conventionally used. The segment 70 mainly includes a skin plate 71, side plates 73, vertical ribs 75, joint plates 79, and the like. The skin plate 71 corresponding to the outer peripheral surface of the tunnel has a curved shape corresponding to the outer diameter of the tunnel. Side plates 73 are provided at both ends on the long side of the skin plate 71. Further, joint plates 79 are provided at both ends on the short side of the skin plate 71. That is, the skin plate 71, the side plate 73, and the joint plate 79 form a box shape.

Vertical ribs 75 are provided at regular intervals in the direction perpendicular to the side plate 73. The vertical rib 75 is a rib arranged in the axial direction of the tunnel, and has a role of resisting the thrust of the shield jack and transmitting a load acting on the skin plate 71 to the side plate 73. Moreover, the vertical rib 75 also has a role for suppressing buckling of the side plate 73 when the tunnel is completed.

The side plate 73 is provided with a joint hole 77 for joining the axial segments 70 of the tunnel. The joint plate 79 is provided with a joint hole 81 for joining the segment 70 in the circumferential direction. Accordingly, the segments 70 are connected to the circumferential direction and the axial direction of the tunnel, respectively. Here, each member is made of steel and joined by welding.

FIG. 9 is a view showing a processing state when the segment 70 is joined to an adjacent concrete frame. In order to join the segment 70 and the concrete frame, first, the skin plate 71 of the segment 70 is removed. When the skin plate 71 is removed, the segment 70 has a ladder shape, and the inside and outside of the tunnel are spatially connected.

Moreover, the center part (shaded part of FIG. 9) of the vertical rib 75 is cut | disconnected. Cutting is for avoiding interference with reinforcing steel bars embedded in the concrete frame. At this time, a part of the vicinity of the joint between the vertical rib 75 and the side plate 73 is left without being cut. This part functions as a shear connector 83 at the time of joining to the concrete casing, and maintains the shear joint strength between the concrete casing and the segment 70.

FIG. 10 is a view showing a state in which the processed segment 70 is embedded in the concrete casing 85 and joined. As shown in FIG. 10, the segment 70 embedded in the concrete housing 85 is prevented from being displaced in the shearing direction between the segment 70 and the concrete housing 85 by the shear connector 85 and is reliably joined. As described above, the segment 70 used in the joint portion with the concrete housing 85 must be provided with the shear connector 85 in order to obtain joint strength, but the vertical rib 75 is usually cut by fusing, and a seal member or the like. Because there are combustible materials in the vicinity, it is dangerous and workability is also poor.

In addition to this, as the structure of the joint part between the concrete frame and the segment, for example, the segment tip and the reinforcing reinforcing bar before placing the concrete are arranged so as to intersect with each other, and the projecting portion from the edge of the top plate of the tunnel There is a joining structure of segments in which reinforcing reinforcing bars extend and extend until they reach the segment ring beyond the vertical line connecting the top of the segment ring and the center of the segment ring (Patent Document 1).

In addition, by connecting a reinforcing bar to form a RC member to a reinforcing bar joint attached to the hollow part of the steel shell, placing concrete to form the RC member, and filling the hollow part of the steel shell with concrete There is a joining structure of a steel shell and an RC member in which an RC member is integrally joined to the outside of the steel shell (Patent Document 2).
JP 2002-188398 A JP 2006-97317 A

However, in the joint structure of Patent Document 1, although the joint portion between the segment and the concrete frame can be enlarged, in order to ensure the joint strength between the segment and the concrete housing, the segment of the joint portion is the same as in the prior art. There is a problem that it is dangerous and workability is poor. Moreover, although the construction work of a reinforcing bar etc. is needed in a tunnel, there exists a problem that a work may be restrict | limited in a tunnel.

In the joint structure of Patent Document 2, it is necessary to weld a flange and a reinforcing rib to the inner surface of the web, and it is necessary to attach a reinforcing bar joint at a predetermined interval to connect the steel shell and the reinforcing bar of the RC member. For this reason, there exists a problem that a structure is complicated and an operation man-hour is required.

The present invention has been made in view of such a problem, and in the case of widening the tunnel, etc., while ensuring the strength of the joint portion between the concrete frame provided on the side of the tunnel and the segment ring constituting the tunnel. An object of the present invention is to provide a supporting member that is excellent in workability and unnecessary for fusing work.

In order to achieve the above-described object, the first invention includes a skin plate, a side plate provided on the long side of the skin plate, and a stress transmission portion provided on the short side of the skin plate. The skin plate of the segment to be removed is removed, a steel plate having a plurality of holes is provided, and the holes penetrate the support member. Here, the support member refers to a member that is used for a joint portion with a concrete frame or the like, in which a skin plate is removed from a segment, and a steel plate having holes is provided instead of the skin plate.

The stress transmitting portion may be embedded with an anchor material inside the concrete, a screw may be provided inside the anchor material, and the steel plate may be provided on both surfaces of the support member.

According to the first invention, at the time of segment ring construction, since the segment has a skin plate, there is no intrusion of water from the outside, but at the time of housing construction, a steel plate having a plurality of through holes is used instead of the skin plate. Reinforcing bars and other reinforcing bars can be provided so as to penetrate the holes, and therefore, stress transmission between the supporting member and the reinforcing bars is performed smoothly, and concrete is placed inside the supporting member including the holes. In addition, it is possible to prevent shear displacement between the support member and the frame without providing a separate shear connector, etc., and it is not necessary to perform the longitudinal rib fusing work when joining the support member and concrete, so the work is safe. In addition, it is possible to provide a support member that can be reduced in cost and simple in structure.

A second invention is a method of constructing a tunnel widening portion,
Removing the first segment skin plate provided in a step of providing a segment ring by a shield machine, a step of excavating a predetermined portion outside the segment ring, and a portion to be joined to the housing of the segment ring; A step of installing a steel plate having a plurality of holes in the first segment; a step of arranging a reinforcing member for a concrete frame in the hole; and an end portion of the first segment in the excavated section. A method for constructing a tunnel widening section, comprising: providing a frame; and removing the second segment of the segmented section of the segment ring.

The reinforcing member may be a reinforcing bar and / or a steel frame.

According to the second invention, when the segment ring is constructed, there is no invasion of water from the outside because it has a normal skin plate, but at the time of constructing the housing, the skin plate can be easily replaced with a steel plate having a plurality of holes. In addition, since the reinforcing steel bars of the frame can be provided so as to penetrate the holes, the stress transmission between the segments (support members) provided with the steel plates having a plurality of holes and the reinforcing bars can be performed smoothly. Since the concrete is cast inside the support member including the holes, shear displacement between the segment and the frame can be prevented without providing a separate shear connector or the like. Therefore, it is possible to provide a method for constructing a tunnel widening section that is safe and can reduce costs.

ADVANTAGE OF THE INVENTION According to this invention, when expanding a tunnel etc., the support member etc. which are used for the junction part of the concrete frame provided in the tunnel side and the segment ring which comprises a tunnel can be provided.

Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 is a diagram showing a segment 1, FIG. 1 (a) is a perspective view of the segment 1, and FIG. 1 (b) is a plan view of the segment 1.

The segment 1 mainly includes a skin plate 5, a side plate 3, a joint portion side plate 9, and the like. The side plate 3 is provided on the long side of the skin plate 5, and the joint portion side plate 9 is provided on the short side. The skin plate 5 is provided with vertical ribs 7 substantially perpendicular to the side plate 3. The skin plate 5 is a portion corresponding to the outer peripheral surface of the tunnel, and the skin plate 5 has a curved shape corresponding to the tunnel shape. The side plate 3 is a side wall portion of the segment 1 and forms a main portion that resists external force acting on the tunnel. The joint portion side plate 9 is a joint portion in the circumferential direction between the segments 1. The vertical rib 7 resists the thrust of the shield jack and transmits a load acting on the skin plate 5 to the side plate 3.

As shown in FIG. 1B, a stress transmission portion 21 is provided at one end of the segment 1, and a portion other than the stress transmission portion 21 is an embedded portion 23. The buried portion 23 is a portion buried in the concrete at the time of joining with the concrete frame. The stress transmission part 21 that joins the segments in the tunnel circumferential direction is filled with concrete. A partition plate 14 is provided between the stress transmission part 21 and the embedded part 23. Details of the stress transmission unit 21 will be described later.

A joint side plate 9 is provided at the end of the stress transmission portion 21. The joint side plate 9 is provided with a joint hole 11 which is a through hole. The joining hole 11 is used when attaching a joining member such as a joint bolt when joining the segment 1 in the circumferential direction of the tunnel.

The side plate 7 is provided with a joint hole 13. The joint hole 13 is for connecting segments in the tunnel axial direction. Further, an injection hole 19 is provided in a portion corresponding to the stress transmission portion 21 of the side plate 3. The injection hole 19 is for injecting concrete into the stress transmission part 21.

The gibber steel plates 15 are provided on both surfaces of the segment 1 so as to cover the stress transmission part 21. The gibber steel plate 15 covers the stress transmission part 21 and extends to the embedded part 23. A portion corresponding to the embedded portion 23 of the gibber steel plate 15 is a joint portion 16, and the joint portion 16 is provided with a plurality of bolt holes 17.

FIG. 2 is a cross-sectional view taken along the line AA in FIG. The AA cross section of FIG.1 (b) is a cross section of the site | part in which the embedded anchor 27 and the screw | thread 29 are arrange | positioned. As shown in FIG. 2, the stress transmission portion 21 is surrounded by the joint portion side plate 9, the partition plate 14, and the gibber steel plate 15, and concrete 25 is placed therein. A gibber 33 is provided on the inner surface of the portion corresponding to the stress transmission part 21 of the gibber steel plate 15.

A joint hole 11 is provided in the joint side plate 9, and an embedded anchor 27 is provided in the concrete 25 at the joint hole 11 site. The buried anchor 27 is integrated with the concrete 25 by the anchor effect.

A hole is provided at the end of the embedded anchor 27, and a screw 29 is provided on the inner surface of the hole by tapping. Therefore, it is possible to join the adjacent segment with the screw 29 with a joint bolt or the like penetrating the joint hole 11.

A portion where the gibber steel plate 15 is extended to the embedded portion 23 is a joint portion 16, and a bolt hole 17 is provided. In the stress transmission portion 25, the force transmitted from the adjacent segment is transmitted to the concrete 25 through the embedded anchor 27 and further transmitted to the outer skin plate 5, the gibber steel plate 15 and the side plate 3.

The segment 1 is used with the skin plate 5 at the time of tunnel construction. Since the skin plate 5 does not have a hole or the like, water can be prevented from entering the tunnel from the outside ground. Since the skin plate 5 is finally removed, the minimum necessary thickness is sufficient.

3A and 3B are diagrams showing the support member 30 according to the present embodiment, in which FIG. 3A is a perspective view of the support member 30 and FIG. 3B is a plan view of the support member 30.

The support member 30 is provided with a steel plate 31 in place of the skin plate 5 of the segment 1, and the skin plate 5 is removed from the segment 1 as shown in FIG. It is constructed by providing the steel plates 31 on both sides of the segment 1.

The steel plate 31 is provided with a plurality of holes 35 and holes 37. Both end portions of the steel plate 31 are joint portions 18, provided with a plurality of bolt holes, and joined to the bolt holes 17 of the segment 1 by bolts 39.

FIG. 4 is a cross-sectional view taken along the line AA in FIG. As shown in FIG. 4, the skin plate 5 is removed and a steel plate 31 is provided. The holes 35 and 37 provided in the steel plate 31 are provided so as to penetrate the support member 30. Further, the joint 18 of the steel plate 31 and the joint 16 of the dowel steel plate 15 are joined by a bolt 39. Therefore, the embedded portion 23 of the support member 30 has a hollow state surrounded by the steel plate 31 and the side plate 3, having the through holes 35 and 37.

FIG. 5 is a view showing a state in which the support member 30 is provided at the joint portion with the concrete frame, and the main reinforcing bar 61 and the reinforcing reinforcing bar 63 of the concrete frame are provided. In order to construct a concrete frame, first, the main reinforcing bar 61 and the reinforcing reinforcing bar 63 are provided so as to ensure the required strength according to the shape of the concrete frame. At this time, as described above, the skin plate 5 is removed from the segment 1, and the support member 30 on which the steel plate 31 is installed is provided. The main reinforcing bars 61 and the reinforcing reinforcing bars 63 are arranged so as to penetrate the holes 35 and 37, respectively.

The sizes and installation positions of the holes 35 and 37 in the steel plate 31 are determined in advance depending on the cross-sectional shape of the main reinforcing bars 61 and the reinforcing reinforcing bars 63 used in the concrete frame to be constructed and the positions where the reinforcing bars 63 are arranged. For example, a concrete rod main bar 61 is provided through the square hole 35, and a reinforcing reinforcing bar 63 is provided through the circular hole 37.

Since the sizes of the holes 35 and 37 are sufficiently larger than the outer diameters of the main reinforcing bar 61 and the reinforcing reinforcing bar 63, respectively, the concrete has a gap between the hole 35, the hole 37 and the main reinforcing bar 61, and the reinforcing reinforcing bar 63 when placing concrete. The inside of the support member 30 is also filled and consolidated. For this reason, the concrete frame and the concrete in the support member 30 are integrated. Therefore, the hole 35 and the hole 37 also serve to prevent the concrete casing and the support member 30 from shifting, and also have a function of receiving force from the penetrating main reinforcing bar 61 and the reinforcing reinforcing bar 63.

As described above, according to the support member 30 according to the present embodiment, at the time of tunnel construction, it is used in the same manner as the conventional segment having the skin plate 5 and the vertical ribs 7 provided on the skin plate, and from the outside of the tunnel. There is no fear of water entering the tunnel, and it has the strength corresponding to the thrust by the shield jack. Further, when the concrete frame is constructed, the skin plate 5 is removed and the steel plate 31 having a plurality of holes is provided so that the main reinforcement 61 and the reinforcing reinforcing bars 63 used in the concrete enclosure penetrate the holes 35 and 37. Therefore, it is not necessary to process the segment 1 (support member 30) in order to prevent interference with the main reinforcing bar 61 and the reinforcing reinforcing bar 63.

Moreover, since the hole 35 and the hole 37 are larger than the outer shape of the main reinforcing bar 61 and the reinforcing reinforcing bar 63 penetrating, the concrete is supported from the gap between the hole 35, the hole 37 and the main reinforcing bar 61 and the reinforcing reinforcing bar 63 when the concrete is placed. The hollow part in 30 is filled. Therefore, the concrete filled in the holes 35 and 37 and the concrete casing are integrated, and the shear displacement between the concrete casing and the support member 30 does not occur, and there is no need to install a shear connector or the like separately.

In addition, since the embedded anchor 27 having the screw 29 is provided in the stress transmitting portion 21 and integrated with the concrete 25, the force from the adjacent segment passes through the embedded anchor 27 and the concrete 25, and the gibber steel plate 15, the steel plate 31, and It can be transmitted to the side plate 3. For this reason, a joint plate or the like is not required, and it is not necessary to firmly weld the joint plate to the skin plate 5 or the like. Therefore, the number of manufacturing steps can be reduced, and deformation due to welding can be prevented.

Further, since the steel plate 31 is joined by the support member 30 and the bolt 39, welding work in the tunnel is unnecessary. For this reason, the construction man-hours for the concrete frame can be reduced, and the work is safe.

Next, the tunnel widening process using the support member 30 will be described. FIG. 6A to FIG. 6F are diagrams showing each process of construction.

First, as shown in FIG. 6A, a retaining wall 41 is provided from the ground 40 at the upper part of the tunnel construction section, and the inside thereof is excavated. A support work 43 is provided inside the retaining wall 41 as necessary. Further, a ground improvement 45 is applied in advance to the base portion of the retaining wall 41.

Next, as shown in FIG. 6B, a tunnel is constructed by a shield machine, and segment rings 47a and 47b are provided. At this time, the segment 1 is arranged in the segment of the part to be joined to the concrete frame. In addition, the segment of other parts can use a normal steel segment, a synthetic segment, etc.

Next, as shown in FIG. 6C, an internal support 49 is provided in the segment rings 47a and 47b, and the outside of the segment ring 47a corresponding to the widened portion of the segment ring 47 (between the segment rings 47a and 47b). Excavating the ground. A support work 43 is provided in the excavation part as needed.

Next, as shown in FIG.6 (d), the skin plate of the segment (normal steel segment etc.) including the segment 1 and arrange | positioned in the position (A part in the figure) facing the excavated site | part is removed. By removing the skin plate, the segment becomes a ladder, and the inside of the segment rings 47a and 47b and the excavation part are spatially connected. Moreover, after removing the skin plate 5 from the segment 1, the steel plate 31 is joined as shown in FIG.

In this state, as shown in FIG. 5, the main reinforcement 61 and the reinforcing reinforcing bars 63 of the concrete frame are arranged so as to penetrate the holes 35 and 37 of the support member 30. Next, concrete is placed in a mold (not shown) so as to embed the support member 30, the main reinforcing bar 61, and the reinforcing reinforcing bar 63, thereby providing the lower bottom plate 51.

Next, as shown in FIG. 6 (e), while removing the support work 43 and the internal support work 49, the main reinforcement 61 and the reinforcing reinforcement 63 which are not shown in the figure are installed, and concrete is placed in a mold not shown. Then, the side wall 55 and the upper bottom plate 53 are provided, and the concrete frame 59 is constructed. In this state, a pavement 57 or the like is formed in the segment ring 47, for example, a road or the like is constructed.

Next, as shown in FIG. 6 (f), the removal segment 65 between the segment ring 47a and the concrete frame 59 is removed, and the support work 43 and the internal support work 49 are all removed to fill the excavation part. return. When the road works and the like in the segment rings 47a and 47b are completed, the tunnel is completed.

FIG. 7 is an enlarged view of part B of FIG. 6 (f), and shows a state in which the support member 30 is embedded in the concrete housing 59. The general segment 60 disposed above the support member 30 is connected to the stress transmission portion 21 of the support member 30 (segment 1). The main reinforcing bar 61 and the reinforcing reinforcing bar 63 of the concrete housing 59 are disposed through the hole 35 and the hole 37 of the support member 30. The embedded portion 23 of the support member 30 (segment 1) is embedded in the concrete housing 59 together with the main reinforcement 61 and the reinforcing reinforcing bars 63. The removal segment 62 is disposed below the support member 30 (segment 1). As described above, the removal segment 62 is removed after the concrete frame 59 is constructed.

According to the tunnel widening work using the support member 30 according to the present embodiment, it can be used as the conventional segment 1 having the skin plate 5 at the time of tunnel construction, and there is a risk of water intrusion from the outside of the tunnel into the tunnel. There is no. In addition, when the concrete frame is constructed, the skin plate 5 is removed from the segment 1, and the support member 30 to which the steel plate 31 having the holes 35 and 37 is attached is constructed, whereby the main reinforcement 61 used for the concrete frame, the reinforcement Since the reinforcing bar 63 is disposed so as to penetrate the hole 35 and the hole 37, the work of processing the support member 30 (segment 1) for preventing interference with the main reinforcing bar 61 and the reinforcing reinforcing bar 63 is not necessary.

Moreover, since the hole 35 and the hole 37 are larger than the outer shape of the main reinforcing bar 61 and the reinforcing reinforcing bar 63 penetrating, the concrete is supported from the gap between the hole 35, the hole 37 and the main reinforcing bar 61 and the reinforcing reinforcing bar 63 when the concrete is placed. The hollow part in 30 is filled. Therefore, the concrete filled in the holes 35 and 37 and the concrete casing are integrated, and the shear displacement between the concrete casing and the support member 30 does not occur, and there is no need to install a shear connector or the like separately.

Further, since the steel plate 31 is joined by the support member 30 and the bolt 39, welding work in the tunnel is unnecessary. For this reason, the construction man-hours for the concrete frame can be reduced, and the work is safe.

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, although the embedded anchor 27 is used for the stress transmission portion 21 as a joint portion with a segment adjacent in the tunnel circumferential direction, a normal joint plate may be firmly welded to the skin plate to form the joint portion. Further, the stress transmission part 21 may be provided not only on one end of the support member 30 but also on both sides. Moreover, although the steel plate 31 was provided on both surfaces of the support member 30, it may be provided only on either the outer surface or the inner surface. Moreover, the method of joining the steel plate 31 to the segment 1 may be welding, or may be joined via a separate joining plate or the like.

The support member 30 is constructed by replacing the skin plate 5 of the segment 1 with the steel plate 31, but instead of the segment 1, a normal steel segment or a synthetic segment can also be used. In this case, by replacing the skin plate such as a normal steel segment with the steel plate 31, the support member 30 can be constructed even when the concrete frame is joined to the existing segment ring. An effect can be obtained.

It is a figure which shows the segment 1, (a) is a perspective view of the segment 1, (b) is a top view of the segment 1. FIG. FIG. 2 is a cross-sectional view taken along the line AA of the segment 1 in FIG. It is a figure which shows the support member 30 which removed the skin plate 5 of the segment 1, and provided the steel plate 31, (a) is a perspective view of the support member 30, (b) is a top view of the support member 30. FIG. 4 is a cross-sectional view of the support member 30 taken along the line AA in FIG. Sectional drawing which shows the installation state of the supporting member 30, the main reinforcement 61 of a concrete frame, and the reinforcement reinforcing bar 63. FIG. The figure which shows the state which excavated the ground 40 and provided the earth retaining wall 41 and the ground improvement 45. FIG. The figure which shows the state in which the segment ring 47 was provided by the shield machine. The figure which shows the state which provided the internal support work 49 in the segment ring 47, and excavated between the segment rings 47. FIG. The figure which shows the state which removed the skin plate of the one part segment which comprises the segment ring 47, provided the supporting member 30, and provided the lower bottom plate 51. FIG. The figure which shows the state which provided the side wall 55 and the upper bottom plate 53, and constructed the concrete frame 59. FIG. The figure which shows the state which removed the support work and backfilled the excavation part. It is the B section enlarged view of Drawing 6 (f), and is a figure showing the state where support member 30 and concrete frame 59 were joined. The perspective view which shows the segment 70. FIG. The figure which shows the processing state of the segment 70 in the site | part joined with a concrete frame. The figure which shows the state in which the segment 70 was joined with the concrete housing 85. FIG.

Explanation of symbols

1 ... Segment 3 ... Side plate 5 ... Skin plate 7 ... Vertical ribs 9 ... Joint side plate 11 ... Joint hole 13 ... Joint hole 14 ... Partition plate 15 ... ... Givel steel plate 16 ......... Joint part 17 ...... Bolt hole 18 ...... Joint part 19 ...... Injection hole 21 ...... Stress transmission part 23 ...... Embedment part 25 ...... Concrete 27 ...... Embedment Anchor 29 ......... Screw 30 ... ... Support member 31 ... Steel plate 33 ... ... Giber 35 ... ... Hole 37 ... ... Hole 39 ... ... Bolt 40 ... ... Ground 41 ... ... Earth retaining wall 43 ... …… Support 45 ……… Ground improvement 47 ………… Segment ring 49 ……… Inner support 51 ……… Lower bottom plate 53 ………… Upper bottom plate 55 ……… Side wall 57 ……… Pave 59 ……… Concrete Frame 60 ... General segment 61 ... Main bar 63 ... Reinforcement reinforcing bar 65 ... Removal Ment 70 ......... segment 71 ......... skin plate 73 ......... side plate 75 ......... vertical rib 77 ......... joint hole 79 ......... joint plate 81 ......... joint hole 83 ......... shear connector 85 ... ... Concrete frame

Claims (5)

Skin plate,
A side plate provided on the long side of the skin plate;
A stress transmission part provided on the short side of the skin plate;
Removing the skin plate of the segment comprising:
A steel plate having a plurality of holes is provided,
The support member, wherein the hole penetrates the support member. The stress transmission part is
The support member according to claim 1, wherein an anchor material is embedded in the concrete, and a screw is provided in the anchor material. The support member according to claim 1, wherein the steel plate is provided on both surfaces of the support member. A method for constructing a tunnel widening section,
Providing a segment ring with a shield machine;
Excavating a predetermined location outside the segment ring; and
Removing the skin plate of the first segment provided in the joint planned portion with the housing of the segment ring, and installing a steel plate having a plurality of holes in the first segment;
Arranging a reinforcing member for a concrete frame in the hole;
Providing a housing with an end in the first segment to the excavated section;
Removing a second segment of the segmented section of the segment ring;
A method for constructing a tunnel widening section, comprising: The reinforcing member is
5. The method for constructing a tunnel widening portion according to claim 4, wherein the tunnel widening portion is a reinforcing bar and / or a steel frame.

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