JP2009138388A - Segment, 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: A plurality of holes 21 and 23 are provided in the outside and inside skin plates 3 and 5 of the segment 1. In other words, the holes 21 and 23 are provided through the segment 1. The holes 21 and 23 of the outside skin plates 3 are provided with covers 9 and 11, respectively. Reinforcements for a concrete skeleton and the like are provided in a penetrating manner in the holes 21 and 23 in connection to the concrete skeleton, respectively. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a method for constructing a segment and a tunnel widening portion, which are used at a joint portion between a casing provided on a side of a tunnel and a segment ring constituting the tunnel, for example, when widening a tunnel.

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. 7 is a perspective view showing a conventionally used steel segment 70. 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. 8 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. 8) 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. 9 is a view showing a state in which the segment 70 after processing is embedded in the concrete frame 85 and joined. As shown in FIG. 9, 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. The purpose is to provide an excellent workability and an unnecessary segment such as a fusing operation.

In order to achieve the above-described object, the first invention provides a first skin plate, a connecting portion provided on a short side of the first skin plate, and a long side of the first skin plate. A segment comprising: a side plate provided; a hole provided in the first skin plate so as to penetrate the segment; and a lid provided in the hole.

The connecting portion may be embedded with an anchor material inside the concrete, and a screw may be provided inside the anchor material.

A second skin plate may be further provided to face the first skin plate, and a hole may be provided so as to penetrate the second skin plate. In this case, concrete may be placed between the first skin plate and the second skin plate.

According to the first aspect of the present invention, since the reinforcing reinforcing bar of the frame can be provided so as to penetrate the hole, the stress transmission between the segment and the reinforcing bar is smoothly performed, Since concrete is placed in the gap between the reinforcing steel bars, etc., shear displacement between the segment and the frame can be prevented without providing a separate shear connector, etc., and the hole is provided with a lid, so the segment There is no water intrusion from the outside when the ring is constructed, and there is no need to melt the vertical ribs when joining the segment and concrete, so the work is safe and the cost can be reduced, and concrete is cast inside. Therefore, the vertical rib is not required, and the segment is not deformed by the welding of the vertical rib. Therefore, a segment with excellent dimensional accuracy and a simple structure can be provided.

2nd invention is the construction method of a tunnel widening part, Comprising: While arrange | positioning the 1st segment described in any one of Claims 1-4 in the junction plan part with a housing, it is in another site | part. Arranging a normal second segment to construct a segment ring, drilling the first segment and a predetermined location outside the second segment, and removing the lid of the first segment And a step of disposing a reinforcing member for a concrete frame in the hole of the first segment, a step of providing a frame so that the first segment has an end in the excavated section, and the excavated And a step of removing the second segment of the section. A method for constructing a tunnel widening section.

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

According to the second aspect of the invention, since the reinforcing reinforcing bar of the frame can be provided in the hole penetrating the segment, the stress transmission between the segment and the reinforcing bar is smoothly performed, and the concrete is formed in the gap between the hole and the reinforcing reinforcing bar. Since it is installed, the shear displacement between the segment and the frame can be prevented without providing a separate shear connector, etc., and since the hole is provided with a lid, water can enter from the outside when constructing the segment ring. In addition, since it is not necessary to perform the fusing work of the longitudinal ribs when joining the segment and the concrete, it is possible to provide a method for constructing a tunnel widening portion that is safe and can be reduced in cost.

ADVANTAGE OF THE INVENTION According to this invention, when expanding a tunnel etc., the segment 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 perspective view of a segment 1 according to the present embodiment, FIG. 1A is a perspective view of the segment 1 as viewed from the tunnel inner side, and FIG. It is the perspective view seen more. FIG. 2 is a plan view of the segment 1.

The segment 1 mainly includes an outer skin plate 3, an inner skin plate 5, a side plate 7, a joint side plate 13 and the like. The outer skin plate 3 and the inner skin plate 5 are provided to face each other, and the outer skin plate 3 and the inner skin plate 5 are joined by the side plate 7 and the joint portion side plate 13. The outer skin plate 3 is a portion corresponding to the outer peripheral surface of the tunnel, and the inner skin plate 5 is a portion corresponding to the inner peripheral surface of the tunnel. Both the outer skin plate 3 and the inner skin plate 5 have a curved shape corresponding to the tunnel shape. The side plate 7 is a side wall portion of the segment 1 and forms a main portion that resists an external force acting on the tunnel. The joint portion side plate 13 is a joint portion in the circumferential direction between the segments 1.

The outer skin plate 3 and the inner skin plate 5 are provided with a plurality of holes 21 and holes 23. That is, the hole 21 and the hole 23 are provided through the segment 1. A lid 9 and a lid 11 are provided in the hole 21 and the hole 23 of the outer skin plate 3, respectively. The lid 9 and the lid 11 are for preventing water from entering from the outer peripheral portion of the segment 1. The lid 9 and the lid 11 can be made of steel or resin, for example.

As shown in FIG. 2, at least one end of the segment 1 is provided with a connecting portion 25, and a portion other than the connecting portion 25 is an embedded portion 27. The buried portion 27 is a portion buried in the concrete at the time of joining with the concrete frame. The connecting portion 25 that joins the segments in the circumferential direction of the tunnel and transmits the force from the adjacent segments is filled with concrete. Details of the connection unit 25 will be described later.

A joint side plate 13 is provided at the end of the connecting portion 25. The joint side plate 13 is provided with a joint hole 19 that is a through hole. The joining hole 19 is used when attaching a joining member such as a joint bolt when joining the segment 1 in the tunnel circumferential direction. A buried anchor 29 having a screw 31 is provided in the joint hole 19.

The side plate 7 is provided with a joint hole 15. The joint hole 15 is for connecting segments in the tunnel axis direction. Further, an injection hole 17 is provided in a portion of the side plate 5 near the connection portion 25. The injection hole 17 is for injecting concrete into the connecting portion 25 or the like.

3 is a cross-sectional view of the segment 1, FIG. 3 (a) is a cross-sectional view taken along line AA in FIG. 2, and FIG. 3 (b) is a cross-sectional view taken along line BB in FIG.

2 is a cross section of a portion where the embedded anchor 29, the hole 21, and the hole 23 are disposed. As shown in FIG. 3A, concrete 35 including the connecting portion 25 is placed between the outer skin plate 3 and the inner skin plate 5 except for the holes 21 and 23. On the inner surfaces of the outer skin plate 3 and the inner skin plate 5, a gibber 33 is provided.

The buried portion 27 is provided with holes 21 and 23. The hole 21 and the hole 23 are provided through the segment 1, and the lid 9 and the lid 11 are provided on the outer skin plate 3 side. The lid 9 and the lid 11 have shapes corresponding to the shapes of the hole 21 and the hole 23, and can completely close the hole 21 and the hole 23. The holes 21 and 23 are arranged so that the reinforcing bars of the concrete frame penetrate through the holes when joining the concrete frame. Details of the state in which the reinforcing bars of the concrete frame are provided in the holes 21 and 23 will be described later.

A joint hole 19 is provided in the joint portion side plate 13, and an embedded anchor 29 is provided in the concrete 35 at the joint hole 19 site. The buried anchor 29 is integrated with the concrete 35 by the anchor effect.

A hole is provided at the end of the embedded anchor 29, and a screw 31 is provided on the inner surface of the hole by tapping. Therefore, it is possible to join the adjacent segment with the screw 31 with a joint bolt or the like penetrating the joint hole 19.

The BB cross section in FIG. 2 is a cross section of a portion without the hole 21, the hole 23, or the like. As shown in FIG. 3 (b), in the portion where the hole 21 and the hole 23 are not provided, the connecting portion 25 and the buried portion 27 are cast with concrete 35 and have no boundary. For this reason, the force transmitted from the adjacent segment in the connecting portion 25 is transmitted to the concrete 35 through the embedded anchor 29 and further transmitted to the outer skin plate 3, the inner skin plate 5 and the side plate 7.

FIG. 4 is a diagram showing a state in which the segment 1 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, the main reinforcing bar 61 and the reinforcing reinforcing bar 63 are arranged so as to penetrate the hole 23 and the hole 21, respectively. When the main reinforcing bar 61 and the reinforcing reinforcing bar 63 are provided, the lid 9 and the lid 11 closing the hole 21 and the hole 23 are removed.

The sizes of the holes 21 and 23 and the installation positions of the holes 21 and 23 in the segment 1 are determined in advance according to the cross-sectional shape of the main reinforcing bar 61 and the reinforcing reinforcing bar 63 used for the concrete frame to be constructed and the positions of the reinforcing bars. Is done. For example, the main hole 61 of the concrete frame is provided through the square hole 23, and the reinforcing reinforcing bar 63 is provided through the circular hole 21.

Since the sizes of the hole 21 and the hole 23 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 21, the hole 23 and the main reinforcing bar 61, and the reinforcing reinforcing bar 63 when placing concrete. Also filled and consolidated. For this reason, the hole 21 and the hole 23 also have a function of preventing displacement from the concrete frame, and also have a function of receiving a force from the penetrating main reinforcing bar 61 and the reinforcing reinforcing bar 63.

As described above, according to the segment 1 according to the present embodiment, the main bar 61 and the reinforcing reinforcing bar 63 used for the concrete frame are provided through the holes 21 and 23 penetrating the segment 1, so that the main bar Processing of the segment 1 for preventing interference with 61 and the reinforcing steel bars 63 is not necessary.

Further, since the holes 21 and 23 are larger than the outer shapes of the main reinforcing bar 61 and the reinforcing reinforcing bar 63 penetrating, the concrete is also placed in the gap between the hole 21, the hole 23 and the reinforcing reinforcing bar 63 and the reinforcing reinforcing bar 63 when the concrete is placed. Filled. Therefore, the concrete filled in the holes 21 and 23 is less likely to cause shear displacement between the concrete frame and the segment 1, and it is not necessary to separately install a shear connector or the like. Moreover, since it has the lid | cover 9 and the lid | cover 11, it can prevent permeation of the water from the ground to the hole 21 and the hole 23 at the time of construction.

In addition, since the concrete 35 is placed inside the segment 1 and the concrete 35 can receive the thrust force from the shield jack, no vertical rib or the like is required, and deformation due to welding during the installation of the vertical rib does not occur.

In addition, since the embedded anchor 29 having the screw 31 is provided in the connection portion 25 and integrated with the concrete 35, the force from the adjacent segment is passed through the embedded anchor 29 and the concrete 35 to the outer skin plate 3 and the inner skin plate. 5, can be transmitted to the side plate 7. 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 outer skin plate 3, the inner skin plate 5, or the like. Therefore, the number of manufacturing steps can be reduced, and deformation due to welding can be prevented.

Next, the tunnel widening process using the segment 1 will be described. Fig.5 (a)-FIG.5 (f) are the figures which showed each process of the construction.

First, as shown to Fig.5 (a), while providing the earth retaining wall 41 from the ground 40 of the upper part of a tunnel construction part, the inside 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. 5B, 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. 5C, an internal support 49 is provided in the segment rings 47 a and 47 b, and the outside of the segment ring 47 a corresponding to the widened portion of the segment ring 47 (between the segment rings 47 a and 47 b). Excavating the ground. A support work 43 is provided in the excavation part as needed.

Next, as shown in FIG.5 (d), except the segment 1, the skin plate of the segment (normal steel segment etc.) arrange | positioned in the position (A part in the figure) which faced 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. Further, the lid 9 and the lid 11 are removed from the segment 1.

In this state, as shown in FIG. 4, the main reinforcement 61 and the reinforcing reinforcement 63 of the concrete frame are installed so as to penetrate the hole 21 and the hole 23 of the segment 1. Next, concrete is placed in a mold (not shown) so as to embed the segment 1, the main reinforcing bar 61, and the reinforcing reinforcing bar 63, thereby providing the lower bottom plate 51. At this time, a gibber 33 may be provided on the outer skin plate 3 and the inner skin plate 5 of the segment 1 as necessary. By providing the gibber 33, shear deviation between the concrete frame to be constructed and the segment 1 is further suppressed.

Next, as shown in FIG. 5 (e), while removing the support work 43 and the internal support work 49, the main reinforcement 61 (not shown) and the reinforcing reinforcing bars 63 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. 5 (f), the removal segment 62 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. 6 is an enlarged view of part B of FIG. 5 (f), and shows a state where the segment 1 is embedded in the concrete frame 59. The general segment 60 disposed above the segment 1 is connected to the connection portion 25 of the segment 1. The main reinforcement 61 and the reinforcing reinforcing bars 63 of the concrete frame 59 are provided through the holes 21 and 23 of the segment 1. The embedded portion 27 of the segment 1 is embedded in the concrete frame 59 together with the main reinforcing bar 61 and the reinforcing reinforcing bar 63. The removal segment 62 is disposed below the segment 1. However, as described above, the removal segment 62 is removed after the concrete frame 59 is constructed.

As described above, according to the tunnel widening work using the segment 1 according to the present embodiment, the segment 1 can be easily formed into the concrete frame 59 without special processing or construction such as construction of a shear connector or the like. Can be joined. That is, the main bar 61 and the reinforcing bar 63 penetrate the hole 21 and the hole 23, and the concrete wraps around the gap between the hole 21, the hole 23 and the main bar 61 and the reinforcing bar 63, and is solidified. The shear deviation from 59 can be suppressed.

Further, since the lid 9 and the lid 11 are provided, it is possible to prevent water from entering the segment ring 47 from the ground through the holes 21 and 23. Moreover, since the holes 21 and 23 and the concrete frame can transmit stress, the segment 1 and the concrete frame 49 can transmit stress smoothly.

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 29 is used for the connection portion 25 as a joint portion with a segment adjacent to the tunnel circumferential direction, a normal joint plate may be firmly welded to the skin plate to form the joint portion. Further, the connecting portion 25 may be provided not only on one end of the segment 1 but on both sides. In addition, when the connection part 25 is one side, the other connection part may be joining with the conventional coupling board and a volt | bolt. The lid 9 and the lid 11 are provided on the outer skin plate 3, but may be provided on the inner skin plate 5 instead of the outer skin plate 3, or may be provided on both. In addition, the concrete 35 is placed inside the segment 1, but instead of the concrete 35, vertical ribs or the like may be arranged so as not to block the holes 21 and 23. Further, the segment 1 has both the outer skin plate 3 and the inner skin plate 5, but only one of them may be provided.

It is a figure which shows the segment 1, (a) is the perspective view seen from the tunnel inner direction, (b) is the perspective view seen from the tunnel outer direction. The top view of the segment 1. FIG. It is sectional drawing of the segment 1, (a) is AA sectional drawing in FIG. 2, (b) is BB sectional drawing in FIG. Sectional drawing which shows the installation state of the segment 1 and the main reinforcement 61 of a concrete frame, and the reinforcement reinforcement 63. 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, 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 5 (f), and is a figure showing the state where segment 1 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 ... Outer skin plate 5 ... Inner skin plate 7 ... Side plates 9, 11 ... Lid 13 ... Joint side plate 15 ... Joint hole 17 ... Injection hole 19 ......... Joint holes 21, 23 ......... Hole 25 ......... Connection part 27 ...... Embedded part 29 ...... Embedded anchor 31 ......... Screw 33 ......... Givel 35 ......... Concrete 40 ......... Ground 41 ......... Retaining Wall 43 ......... Bridge 45 ......... Ground Improvement 47 ......... Segment Ring 49 ......... Inner Support 51 ...... Lower Bottom Plate 53 ...... Upper Bottom Plate 55 ......... Side Wall 57 ......... Pavement 59 ......... Concrete frame 60 ......... General segment 61 ......... Main reinforcement 62 ......... Removal segment 63 ......... Reinforcement reinforcement 70 ......... Segment 71 ......... Skin plate 73 ......... Side plate 75 ……… Vertical rib 77 ……… Joint hole 79 ……… Join Plate 81 ......... joining hole 83 ......... Shear connectors 85 ......... concrete skeleton

Claims (6)

A first skin plate;
A connecting portion provided on the short side of the first skin plate;
A side plate provided on the long side of the first skin plate;
A hole provided in the first skin plate to penetrate the segment;
A lid provided in the hole;
The segment characterized by comprising. The connecting portion is
The segment according to claim 1, wherein an anchor material is embedded in the concrete, and a screw is provided in the anchor material. A second skin plate provided opposite to the first skin plate;
The segment according to claim 1, wherein a hole is provided so as to penetrate the second skin plate. The segment according to claim 3, wherein concrete is placed between the first skin plate and the second skin plate. A method for constructing a tunnel widening section,
The process of constructing a segment ring by arranging the first segment according to any one of claims 1 to 4 at a portion to be joined with a housing and arranging a normal second segment at another part When,
Drilling a predetermined location outside the first segment and the second segment;
Removing the lid of the first segment and disposing a reinforcing member for a concrete frame in the hole of the first segment;
Providing a housing with an end in the first segment to the excavated section;
Removing the second segment of the excavated section;
A method for constructing a tunnel widening section, comprising: The reinforcing member is
The method for constructing a tunnel widening portion according to claim 5, wherein the tunnel widening portion is a reinforcing bar and / or a steel frame.

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