JP2013129985A - Seismic strengthening method with reinforced inner lining of tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seismic strengthening method with reinforced inner concrete lining of a tunnel using a resin concrete panel, which allows a tunnel to have an improved earthquake resistance level of 2.SOLUTION: A seismic strengthening method for a tunnel comprises the steps of: installing an H-shaped steel support 2 on the inner face of a tunnel lining concrete; arranging a circumferential reinforcing bar 3 along the direction parallel with the support 2; arranging an axial reinforcing bar 4 along the axial direction of the tunnel; binding the circumferential and axial reinforcing bars to each other at an intersection; further installing a reinforcement steel plate 5 along the axial direction of the tunnel; temporarily fixing a resin concrete panel 1 to the entire surface of the support 2, the resin concrete panel 1 having an insert fitting 10 for fixing the panel at the rear panel face which is mineral surfaced for adhesion enhancement at the rear face; filling a gap between the panel back side and an existing lining concrete 7 with a high strength fine particle grout mortar 6; and integrating the support 2, the circumferential and axial reinforcing bars 3 and 4, the reinforcement steel plate 5, and the panel 1.

Description

  The present invention relates to a lining inner winding reinforcement by reinforcement or repair of tunnel lining concrete, and more particularly, to a tunnel inner winding reinforcement lining 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

  An object of the present invention is an earthquake resistant inner winding reinforcement lining for a tunnel in which a reinforcing steel plate is added to a structure using a resin concrete panel and a reinforcing steel bar combined with an H-shaped steel support as a reinforcing material. The purpose is to provide a method of constructing a seismic structure in which the seismic strength of the tunnel is improved to the level 2 standard by winding reinforcement work in a manner that minimizes the missing part of the hollow section in the tunnel.

  In the construction method of the present invention, an H-shaped steel support is installed on the inner surface of the tunnel concrete lining to reduce the amount of voids in the tunnel's internal cross section. The case where the double reinforcement is made possible by the single reinforcement with the structural strength of the shear reinforced steel sheet, and the circumferential reinforcement reinforcement along the parallel direction of the support work And through holes to connect the axial rebar to the web part of the steel support by inserting and fixing to the sleeve attached to the web facing both ends of the hook type combined rebar Since the support strength of the small cross section is possible, the axial rebar and the circumferential main rebar are bound to each other at the intersection, further reducing the tunnel strength. Steel along the axial direction A shear-reinforced steel plate can be installed between the supports in the cross section of the support work, and then a resin concrete panel with a panel fixing insert metal fitting is temporarily fixed to the entire surface of the support work. The support structure, the reinforcing bars in the circumferential direction and the axial direction, the reinforcing steel plate, and the panel are integrated by filling and consolidating high-strength fine particle grout mortar in the gap between the lining concrete and the existing lining concrete. It is a seismic reinforcement method for tunnels.

  In the above method, the reinforcing reinforcing bars arranged along the axial direction of the tunnel are hook-type combined reinforcing bar joints, so that hooks at both ends are attached to the sleeve provided on the web facing the adjacent support work. Reinforcing steel plates installed in the axial direction of the tunnel will be arranged by the insertion method and the work space will be generated, and both ends will be inserted and fixed to the end fittings provided on the flange facing the support It becomes easy, and it can also be installed in the cross section of a small cross section steel support.

  In these methods, the 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 the 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 .

  In addition, as a joint of the main reinforcing bar, a mechanical joint that is attached by simple work and has high connection strength is used. As a reinforcing filling mortar, it has excellent fluidity and is obstructed by steel plates and reinforcing bars arranged in a narrow cross section. It is preferable to use a high-strength fine-grain grout mortar that is completely filled without any details and that has a stable suspending property that does not cause sedimentation separation even in long-distance pumping.

  The tunnel reinforced by the construction method of the present invention is not only reinforced by the circumferential reinforcing bar which is the main reinforcing bar and the axial reinforcing bar which is the distribution bar, but also by the shearing force generated by the installed reinforcing steel plate due to the vibration of the earthquake. In contrast, it exerts a reinforcing effect and has 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 addition, in this construction method, reinforcing steel materials such as reinforcing bars and steel plates are combined with the supporting steel by inserting the ends of each reinforcing steel material into sleeves and end fittings installed in the supporting steel. Can be fixed and fixed efficiently, and then a high-strength fine grain grout mortar with excellent fluidity is packed and consolidated to form an integrated structure. The resulting method is a steel material that can be assembled efficiently.

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 a portion B in FIG. 1 and shows a state where a reinforcing steel plate is installed. 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.

  The details of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a cross-sectional explanatory view of a tunnel having an inner lining as a seismic reinforcement structure according to the method of the present invention. An H-shaped steel support 2 is installed, and a circumferential reinforcing bar 3 as the main reinforcement is arranged along the parallel direction of the support 2, and 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 the reinforcing 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 a mounting portion 11 for temporarily fixing the H-shaped steel support 2 to the H-shaped steel support 2. Can be fixed. 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 the gap between the resin concrete panel 1 and the existing lining concrete 7 is filled with high-strength fine particle grout mortar 6, and the inner surface cover of the tunnel reinforced by earthquake resistance by the method of the present invention. The construction structure is shown.

  The resin concrete panel used in the present invention is mixed with thermosetting resin such as unsaturated polyester resin or epoxy resin with fine aggregate 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 construction method of the present invention is suitable for a method of reinforcing an existing tunnel to provide a seismic reinforcement structure, but can also be applied as an inner surface lining of a seismic structure when a tunnel is newly established.

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 A resin concrete panel fitted with a panel fixing insert fitting is temporarily attached to the back of the panel that has been sanded, and the gap between the back of the panel and the existing lining concrete is filled with high strength fine grain grout mortar with excellent fluidity. An earthquake-resistant reinforcement method for tunnels, comprising integrating the support, circumferential and axial reinforcing bars, reinforcing steel plates, and the panel.   2. The seismic reinforcement method 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 are provided on the web facing the adjacent supporting 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 A seismic reinforcement method for tunnels, which is installed by inserting both ends.   The earthquake-resistant reinforcement method according to claim 1 or 2, wherein the shape of the panel fixing insert metal fitting is a disk shape.

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