JP3174028U - Seismic reinforcement structure for tunnels - Google Patents

Abstract

To provide a seismic reinforcement structure for improving the inner strength of a tunnel lining concrete using a resin concrete panel and improving the seismic strength of the tunnel to a level 2 standard.
An H-shaped steel support 2 is installed on the inner surface of the tunnel lining concrete, and circumferential reinforcing reinforcing bars 3 are arranged along the parallel direction of the support 2, and the axis along the axial direction of the tunnel is provided. The directional reinforcing bars 4 are arranged, the circumferential direction and the axial direction reinforcing bars are bound to each other at an intersection, and a reinforcing steel plate 5 is installed along the axial direction of the tunnel. Next, a resin concrete panel 1 having a panel fixing insert 10 attached to the back surface of the panel that has been sanded to increase adhesion to the back surface is fixed to the entire surface of the support 2, and the back surface of the panel and the existing lining concrete are fixed. 7 is filled with high-strength fine particle grout mortar 6, and the support 2, the circumferential and axial reinforcing bars 3 and 4, the reinforcing steel plate 5 and the panel 1 are integrated.
[Selection] Figure 1

Description

  The present invention relates to a lining inner winding reinforcement structure by reinforcing and repairing tunnel lining concrete, and more particularly to a tunnel inner winding reinforcement lining structure for the purpose of seismic reinforcement.

  In tunnel inner lining reinforcement lining, an H-shaped steel support is installed along the inner surface of the tunnel lining concrete, and a method of fixing a resin concrete panel for lining to this support is often adopted. Yes. In this method, resin concrete panels are fixed to a plurality of supporters installed in the tunnel, and the tunnel inner surface is covered with the inner volume reinforcing filler, and the reinforcing material is provided between the panels and the existing concrete surface. Is carried out by integrating the resin concrete panel and the reinforcing filler and lining the inner surface of the tunnel. Also, materials and methods for fixing the support work and the panel have been proposed for the purpose of reducing costs and improving work efficiency. For this reason, not only the repair and reinforcement of tunnels but also the establishment of new tunnels, the adoption of this method is increasing.

  Patent Document 1 shows a support member for supporting a tunnel repair plate on an H-shaped steel support, and the support member can be attached to the flange portion of an adjacent support by a simple operation. It is shown. Patent Document 2 also discloses a fixing material capable of efficiently fixing a resin concrete panel for inner surface lining to a support work.

  On the other hand, due to the great earthquake, there is a great demand for earthquake-resistant reinforcement for tunnels, and it is necessary to provide an earthquake-resistant structure for inner surface lining using resin concrete panels, and it is desirable to improve the strength for earthquake-resistant reinforcement. ing. However, although the materials and methods shown in Patent Documents 1 and 2 can perform inner surface lining efficiently and at a low cost and have a certain reinforcement effect, the seismic reinforcement structure up to the level 2 standard is Not shown.

JP 2002-188399 A Utility Model Registration No. 3165913

  The subject of the present invention is an earthquake resistant inner volume reinforcement lining of a tunnel in which a reinforcing steel plate is added to a structure using a plastic steel panel and a reinforcing bar combined with an H-shaped steel support as a reinforcing material. It is to provide a seismic structure with improved seismic strength up to Level 2 standards.

  The seismic structure of the present invention has an H-shaped steel support on the inner surface of the tunnel concrete lining, and a circumferential reinforcing bar is arranged along the parallel direction of the support by a mechanical joint combination. Hook-type combined rebars are arranged along the axial direction, the axial rebars and the circumferential main rebar are bound together at the intersection, and a shear-reinforced steel plate is installed between the support works along the axial direction of the tunnel. Installed, and then temporarily fixed a resin concrete panel with a panel fixing insert fitting on the back surface over the entire surface of the support, and filled the high-strength fine grain grout mortar in the gap between the panel back surface and the existing lining concrete. An anti-seismic reinforcement structure for a tunnel, characterized in that the supporting work, the reinforcing bars in the circumferential direction and the axial direction, the reinforcing steel plate and the panel are integrated.

  Further, in the above structure, reinforcing reinforcing bars arranged along the axial direction of the tunnel are inserted into hooks on both ends of the sleeves provided on the facing webs of the adjacent support works using hook type combined reinforcing bar joints. The reinforcing steel plate installed in the axial direction of the tunnel is also characterized in that it is installed by inserting both ends into an end receiving bracket provided on the flange facing the adjacent support work.

  In these structures, reinforcing bars that are arranged along the circumferential direction of the tunnel, which is parallel to the support work, are the main reinforcing bars, and reinforcing bars that are arranged along the axial direction of the tunnel are the reinforcing bars. Reinforcing bars are bound to each other at crossing points, and have an internal winding reinforcement structure together with a steel support. Similarly, the reinforcing steel plate installed between the support works in the axial direction of the tunnel is installed for shear reinforcement. Resin concrete panels that are temporarily fixed to the support are fixed more firmly by attaching the mounting brackets for panel mounting embedded in high-strength fine grain grout mortar and combining with the adhesive force by sanding on the back of the panel .

  Moreover, it is preferable to use a mechanical joint that is attached by a simple operation and has high connection strength as the joint of the main reinforcing reinforcing bar, and as the reinforcing filling mortar, a high-strength fine particle grout mortar is used in the case of long-distance feeding.

  The tunnel reinforced with the structure of the present invention is not only reinforced by the circumferential reinforcing bars that are the main bars and the axial reinforcing bars that are the distribution bars, but also by the installed reinforcing steel plate against the shear force generated by the vibration of the earthquake. Reinforces the structure and provides an excellent seismic reinforcement structure. Furthermore, the resin concrete panel is fitted with a fixing insert metal fitting, and is embedded with a reinforcing steel material such as a support, a reinforcing bar and a steel plate by a high-strength fine particle grout mortar filled and closely integrated. Therefore, even in the event of an earthquake, it exhibits an excellent seismic strengthening effect without being separated or dropped off, resulting in an earthquake resistant structure up to Level 2 standards.

  In this structure, reinforcing steel materials such as reinforcing bars and steel plates are installed in such a way that the ends of each reinforcing material are inserted into sleeves and end brackets installed in the support and fixed to the support. Thus, it is possible to reliably fix and fix the reinforcing steel material by filling the high-strength fine particle grout mortar, and it is possible to construct it by more efficient work.

Cross-sectional explanatory drawing of the tunnel reinforced by earthquake resistance by inner surface lining using a resin concrete panel. It is detailed explanatory drawing of the A section in FIG. 1, Comprising: The circumferential and axial reinforcement reinforcement state is shown. FIG. 2 is a detailed view of part B in FIG. Cross-sectional explanatory drawing of the upper quarter part which shows the fixed state of the resin concrete panel. Plane explanatory drawing of the resin concrete panel which attached the metal fitting for panel fixation. FIG. 5 is a detailed explanatory view of a portion C in FIG. 4 and shows a mounting state of the panel fixing insert fitting. FIG. 7 is a detailed explanatory view of the panel fixing insert fitting and the mounting member shown in FIG. 6. FIG. 2 is a partial cross-sectional plan view seen from above the tunnel reinforced with earthquake resistance shown in FIG. 1.

  Details of the present invention will be described below with reference to the drawings.

  FIG. 1 is a cross-sectional explanatory view of a tunnel in which the inner lining is the seismic reinforcement structure of the present invention. A plurality of H-shaped steels are formed along the circumferential direction of the tunnel on the inner surface of the tunnel where the existing lining concrete 7 of the tunnel is cut. A steel support 2 is installed, and a circumferential reinforcing bar 3 as the main reinforcement is laid along the parallel direction of the support 2, and the power distribution along the axial direction of the tunnel (the vertical direction in the figure in FIG. 1) The reinforcing bars 4 in the axial direction, which are bars, are arranged. The circumferential reinforcing bar 3 and the axial reinforcing bar 4 are bound to each other and arranged in a lattice pattern along the inner surface of the tunnel. Further, a plurality of reinforcing steel plates 5 are installed for shear reinforcement along the axial direction of the tunnel. The entire surface of the support 2 is temporarily fixed with a resin concrete panel 1 having a panel fixing insert 10 attached to the back surface of the panel whose back surface is sanded. The gap with the lining concrete 7 is filled with high-strength fine particle grout mortar 6, and the support 2, the circumferential reinforcing bar 3 and the axial reinforcing bar 4, the reinforcing steel plate 5, and the panel 1 are integrally embedded and fixed. ing.

  The H-shaped steel support 2 installed along the circumferential direction of the tunnel shown in FIG. 1 is connected by a joint plate 23 at the tunnel zenith, and is installed from the arch portion of the ceiling to the side wall portion. A pair of support works fixed to the bottom of the tunnel and a support work connected to the pair of support works at the bottom of the tunnel. The circumferential reinforcing steel bars 3 are arranged in the direction along the H-shaped steel support 2 as main bars, and the reinforcing bars are connected by mechanical joints 31. The axial reinforcing reinforcing bars 4 are arranged between adjacent supporting works by inserting hooks at both ends into a sleeve 8 provided in the H-shaped steel supporting works 2. Further, the reinforcing steel plate 5 is installed between the adjacent support works by inserting both end parts into the end receiving metal fitting 9 provided in the H-shaped steel support work 2. And the resin concrete panel 1 is installed in the whole surface of the arch part of a ceiling, a side wall part, and a bottom part (invert part).

  FIG. 2 is a detailed explanatory view of a portion A in FIG. 1, showing a bar arrangement state of each reinforcing bar, (A1) is a plan view seen from above the tunnel, and (A2) is a side view. The axial reinforcing reinforcing bars 4 arranged along the axial direction of the tunnel are hook-type combined joint reinforcing bars, and both ends are hooks 41 bent 90 degrees. The bars are arranged by inserting hooks 41 at both ends into the sleeve 8 provided on the web 21 facing the adjacent H-shaped steel support 2. The circumferential reinforcing bar 3 that is the main reinforcing bar and the axial reinforcing bar 4 that is the distributing bar are bound to each other at the intersection 42.

  3 is a detailed explanatory view of a portion B in FIG. 1, showing an installation state of the reinforcing steel plate 5, (B 1) is a plan view seen from above the tunnel, (B 2) is a side view in the axial direction of the tunnel, B3) is a side view seen from the wall side direction. The reinforcing steel plate 5 installed along the axial direction of the tunnel is inserted into the L-shaped end receiving bracket 9 provided on the flange 22 facing the adjacent H-shaped steel support 2 so as to be adjacent. It is installed between supporting works.

  FIG. 4 is a cross-sectional explanatory view of the upper quadrant showing the fixed state of the resin concrete panel 1, and this panel 1 is an H-shaped steel support 2 in which the circumferential reinforcing bar 3 and the axial reinforcing bar 4 are installed. It is fixed on the surface. The back surface of the resin concrete panel 1 is sanded, and a panel fixing insert metal fitting 10 is mounted on the back surface, and the circumferential reinforcing reinforcing bar 3 and the axial reinforcing reinforcing rod 4 are made of high strength fine grain grout mortar to be filled. The resin concrete panel 1 is temporarily fixed to the H-shaped steel support 2 and is firmly fixed together with the insert fitting after the high-strength fine particle grout mortar is consolidated. FIG. 5 is an explanatory plan view of the resin concrete panel 1 to which the panel fixing insert fitting 10 is attached, and four panel fixing insert fittings 10 are attached to the back surface. The resin concrete panel 1 is provided with an attachment portion 11 for temporarily fixing to the H-shaped steel support 2 and is temporarily fixed to the H-steel support 2 with bolts or the like using the attachment 11. can do. As the resin concrete panel 1, a plurality of types of panels having a curved surface and a size corresponding to a place to be fixed in the tunnel are used. A plurality of types of panels are used to attach and fix to the entire surface of the H-shaped steel support 2 so as to cover the entire inner surface of the tunnel such as the arch, side wall, and invert of the ceiling. As shown in FIG. 1, the temporarily fixed resin concrete panel 1 has a panel fixing insert fitting 10 mounted on the back surface embedded in a high-strength fine particle grout mortar 6 and integrated with a reinforcing steel material or the like. In addition, it can be firmly fixed to the high-strength fine particle grout mortar together with the H-shaped steel support 2 so that an earthquake-resistant structure can be obtained.

  FIG. 6 is a detailed explanatory view of a portion C in FIG. 4, and is an explanatory view of mounting the panel fixing insert fitting 10 to the resin concrete panel 1. FIG. 7 is an explanatory view of members used for mounting. As shown in FIGS. 6 and 7, the panel fixing insert fitting 10 is screwed into a bolt 13 and fixedly attached to the resin concrete panel 1. First, the bolt 13 that has penetrated the bolt hole 12 is fixed to the resin concrete panel 1 by the washer 14 and the nut 15, and then the insert fitting 10 is screwed and attached to the tip of the fixed bolt 13, so that the insert fitting is fixedly attached to the panel. it can.

  8 is a partial cross-sectional plan view seen from above the tunnel reinforced with earthquake resistance whose cross-sectional view is shown in FIG. 1, and between adjacent H-shaped steel support works (8-1) to (8 -5) is an explanatory diagram of the installation of the reinforcing members and panels at the ceiling arch of the tunnel.

  (8-1) shows an axial reinforcing steel bar 4 which is arranged by inserting a hook at an end into a sleeve 8 provided in the H-shaped steel support 2. In (8-2), the circumferential reinforcing bar 3 is laid in parallel with the H-shaped steel support 2 and bound at the intersection 42 with the axial reinforcing bar 4 so that both reinforcing bars are arranged in a lattice pattern. It has been shown. (8-3) shows a resin concrete panel 1 fitted with the panel fixing insert metal fitting 10, and (8-4) shows joints at the joints at the zenith and support sections of the resin concrete panel 1 arranged. It shows that the work 16 is applied. (8-5) is a state in which a high-strength fine particle grout mortar 6 is filled in the gap between the resin concrete panel 1 and the existing lining concrete 7, and the inner surface cover of the tunnel reinforced with earthquake resistance by the structure of the present invention. The construction structure is shown.

  Resin concrete panels used in the present invention are mixed with thermosetting resin such as unsaturated polyester resin and epoxy resin with fine aggregates such as silica sand and calcium carbonate, glass fiber, etc., and press molded at high pressure while heating. Panel is optimal, very tight, hard and has stable chemistry. Therefore, it is excellent in strength, and is sufficiently used as a precast panel for lining even with a thickness of about 10 mm, and is preferable as a material for seismic reinforcement.

  As the back-filling mortar, a high-strength fine particle grout mortar obtained by adding a fine particle admixture to cement is preferably used. Fine grain grout mortar is preferably used because it has excellent long-distance pumpability, little bleeding due to special additives, and excellent long-term durability.

  In addition, as a panel fixing insert metal fitting, the outer periphery is short with respect to the area and there are no corners. Without limitation, other shapes can also be used.

  The structure of the present invention is suitable for reinforcing an existing tunnel to provide a seismic reinforcement structure, but can also be applied as a new inner surface lining structure for a tunnel.

DESCRIPTION OF SYMBOLS 1 Resin concrete panel 2 H-shaped steel support 21 Web 22 Flange 3 Circumferential reinforcement reinforcement 31 Mechanical joint 4 Axial reinforcement reinforcement 41 Hook 42 Intersection 5 Reinforcement steel plate 6 High strength fine grain grout mortar (backing mortar)
7 Existing lining concrete 8 Sleeve 9 End bracket 10 Insert bracket for panel fixing 11 Mounting portion 12 Bolt hole 13 Bolt 14 Washer 15 Nut 16 Joint construction

Claims (3)

  An H-shaped steel support is installed on the inner surface of the tunnel lining concrete, and circumferential reinforcement bars are arranged along the parallel direction of the support works, and axial reinforcement reinforcement bars are arranged along the axial direction of the tunnel. In order to bind the circumferential and axial reinforcing bars to each other at the intersection, and further install a reinforcing steel plate along the axial direction of the tunnel, and then increase the adhesion to the back surface over the entire surface of the support Attach and fix a resin concrete panel fitted with a panel fixing insert bracket on the back of the sanded panel, and fill the gap between the back of the panel and the existing lining concrete with high-strength fine grain grout mortar. Seismic reinforcement structure for a tunnel, characterized in that direction and axial reinforcing bars, reinforcing steel plates and the panel are integrated.   The seismic reinforcement structure according to claim 1, wherein the axial reinforcing reinforcing bars arranged along the axial direction of the tunnel are hook-type combined joint reinforcing bars, and sleeves provided on the webs facing the adjacent support works By inserting hooks at both ends, each support work is connected and reinforced, and the reinforcing steel plate installed in the axial direction of the tunnel is attached to the end receiving bracket provided on the flange facing the adjacent support work Seismic reinforcement structure for tunnels, characterized by being installed by inserting both ends.   The earthquake-proof reinforcement structure according to claim 1 or 2, wherein the shape of the panel fixing insert metal fitting is a disk shape.

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