JP4527829B2 - Detachment protection structure of tunnel lining - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, in existing tunnels such as old and healthy railway tunnels and road tunnels, the lining strength is increased to prevent the lining concrete from collapsing or peeling off. The present invention also relates to a protective structure on the inner surface of the existing tunnel lining that protects the stripped pieces from falling into the tunnel.
[0002]
[Prior art]
Recently, there have been many cases of stripping of lining concrete in railway tunnels and road tunnels, and there are examples of damage to passing trains. For this reason, investigation and diagnosis of existing tunnels are vigorously conducted in various directions to investigate the cause.
At present, the cause of peeling of lining concrete has been clarified although cold joints, neutralization of concrete, alkali-aggregate reaction, etc. associated with concrete placement during tunnel construction have been tried.
[0003]
On the other hand, ensuring the safety of trains and vehicles passing through the tunnel is extremely important, and measures are being studied nationwide.
For repair and reinforcement measures for conventional aging tunnels, see “Tunnel reinforcement and repair manual”: October 1990 (Railway Technical Research Institute) and “Tunnel tunnel countermeasure design design manual”: February 1998. May (Railway Technical Research Institute).
[0004]
In these manuals, more than ten kinds of countermeasures are shown according to the cause of tunnel deformation, and the appropriate one is selected. Among these countermeasure methods, those that can be applied as countermeasures against peeling of the lining concrete include (1) “pad plate method”, (2) “steel plate bonding method”, and (3) “centre reinforcement”.
[0005]
(1) In the case of the “patting plate method”, a steel batting plate (strip steel, die steel) is attached to the lining inner surface of the peeled part, anchored to the lining concrete with a lock bolt, and then backfilling material is injected. It is applied when repairing locally.
[0006]
(2) The “steel bonding method” is a relatively new method, in which a 4.5 mm standard steel plate is attached to the lining surface with an epoxy resin adhesive and fixed to the lining concrete with anchor bolts. . 7 anchor bolts / m² Arrange to the extent. In addition,
The end of the steel plate is fastened with an adhesive and an anchor bolt to a joint steel plate that is overlapped with the adjacent steel plate.
[0007]
(3) In the case of “Centre Reinforcement”, as shown in FIG. 15, a 100-150 mm size H-shaped steel bent to the same shape as the inner surface of the tunnel lining is placed at appropriate intervals along the inner surface of the lining. The reinforcing arch centre 30 is arranged by the above-described structure, and is reinforced by a wedge (not shown) at appropriate intervals on the inner surface of the lining.
[0008]
[Problems to be solved by the invention]
In the protection method against lining concrete peeling of existing tunnels such as railway tunnels and road tunnels covered by the present invention, in order to ensure the safety of passing vehicles through the tunnel, the installation of protective members, etc., will exceed the building limits. Is not allowed. Moreover, in a railway tunnel, the working time of a day is limited to a midnight operation suspension time zone (2 to 3 hours or several hours), and there are restrictions such as a lot of obstacles such as power supply cables and signal lines. Moreover, in a road tunnel, when there is no detour, it is necessary to perform construction while regulating traffic, and rapid construction is an important issue.
[0009]
Furthermore, it must be ensured that the protective structure does not loosen against the wind pressure and vibration of trains, etc. that pass through the tunnel during the construction period and after completion of the countermeasure work. In particular, there shall be no fall of protective members from the upper part of the tunnel.
[0010]
Therefore, when the prior art is applied under such conditions, there are the following problems.
In the case of the prior art (1) “batch plate method” and (2) “steel plate bonding method”, a steel cover plate (band steel, steel plate) is pasted on the inner surface of the peeled part, and the concrete is covered with lock bolts. Because of the anchoring, the work of drilling holes for rock bolts in the lining concrete is involved and rapid construction is impossible. Moreover, since the anchor strength cannot be ensured with deteriorated lining concrete, it is necessary to hang up to a sound concrete surface, which further increases the working time.
[0011]
In this structure, since the lock bolt is used, if the bolt is cut or the anchor is removed, the bolt may fall and damage the train or vehicle passing through the tunnel.
[0012]
In the case of the prior art {circle around (3)} “centre reinforcement work”, the wedge is used to transmit the load between the center and the existing lining, so that the center is in a discrete point support state by the wedges arranged at intervals. Therefore, in order to resist bending stress acting on the centle member and prevent buckling due to compressive force, it is necessary to arrange an arch centle 30 made of a large H-shaped steel having a thickness of at least 100 mm on the inner surface of the tunnel lining. There was a limit to thinning. If the building limit is not enough, it is necessary to secure the space in the tunnel by lining the centle part, which can not be done quickly and may promote the peeling of the old lining. is there. In addition, the wedges used in this structure may come loose and fall off due to vibration, and regular inspection is essential.
[0013]
The present invention eliminates the above-mentioned problems, reduces the overhang from the inner surface side of the existing tunnel lining to the inner surface, and secures the construction limit. It provides a tunnel lining peeling protection structure that enables rapid construction.
[0014]
[Means for Solving the Problems]
  The protection structure for the inner surface of the existing tunnel lining according to the present invention is summarized as follows.
(1) In a protective structure in which a plurality of arch supports are installed at intervals in the axial direction of the existing tunnel inner surface, and a surface member is disposed between the arch supports to cover the existing tunnel inner surface,
  The arch support is divided into a plurality of arch components having fitting joints in the circumferential direction, and the surface members are mounted on the side surfaces of the arch components.GrooveFormed, the lower end of the arch support is fixed to the existing tunnel by fixing means,
The surface member spanned between the arch supports is an arch component member.In the grooveUse a thin panel of dimensions that can be installed,
  At least the back surface of the arch support is closely attached over the entire circumferential direction by the contact means.,
At least one surface member insertion port through which the surface member can be inserted into the groove is provided in a part of the arch component member on the inner surface side of the tunnel.This is a tunnel lining peeling protection structure.
[0016]
(2) The surface member is a metal plate material, a mesh material with a frame, or a panel having a composite structure of metal and concrete, and a wide material formed with a curvature substantially equal to the lining or a flat plate-like narrow material. The tunnel lining peeling protection structure according to (1), wherein the tunnel lining is arranged with substantially the same curvature as the inner surface of the lining.
[0017]
(3The surface member is tapered in the circumferential edge of the tunnel and fixed in the groove of the arch component member by its wedge action (1)Or(2) NoteDetachment protection structure of the tunnel lining shown.
[0018]
(4) The surface member is characterized in that the end portions in the circumferential direction of the tunnel are connected to each other by pins or the like so that they can be inserted continuously from the surface member insertion port (1) Detachment protection structure of tunnel lining as described.
[0019]
(5) The close contact means of the arch support uses a flexible bag provided on the back surface of the arch component member as a mold, and fills and solidifies the grout material in the bag. Detachment protection structure for tunnel lining.
[0020]
[Action]
According to the first invention, the back surface of the arch support with the lower end fixed is brought into close contact with the existing lining over the entire circumferential direction to restrain the deformation of the arch support, thereby reducing the acting bending moment and improving the buckling strength. Therefore, the arch support can be configured with a thin member having a relatively low bending rigidity. Moreover, the inner surface of the protection structure after completion can be stored within a building limit by using a thin member also for the surface member spanned between arch supports.
Also, the arch support is divided into a plurality of arch components and is easily assembled on site with a fitting joint. The side end (longitudinal end) of the cross section of the arch component member is formed with a groove or step for mounting the surface member. The groove or step serves as a guide for sliding the surface member during construction, and the surface member receiving portion when completed. Therefore, it is possible to easily install and position the surface member.
[0021]
According to the second aspect of the present invention, in the arch support composed of the arch component member having the groove for mounting the surface member on the side surface, the surface cut out so that the surface member can be inserted into the groove on a part of the inner surface side of the arch component member By providing at least one member insertion opening, the surface member can be sequentially inserted and slid to facilitate installation.
[0022]
According to the third invention, the surface member can be a metal plate material, a mesh material with a frame, or a panel of a composite structure of metal and concrete, and can be used properly or mixed depending on the characteristics of each panel. . In other words, in addition to the peeling prevention function of tunnel lining, use plate material when it is necessary to prevent dripping of water leakage, or use a mesh material with a frame in places where visual inspection of existing lining is required When an increase in lining strength is expected, a composite structure panel can be used.
When the surface member is wide, it can be efficiently inserted into the arch support by forming the surface member with a curvature substantially equal to that of the lining in advance. Further, the surface member can be made narrower and lighter to facilitate the work. In this case, a flat plate is used and is arranged approximately with the same curvature as the inner surface of the lining. If a flat plate is used, the bending of the surface member is unnecessary and economical.
[0023]
According to the fourth aspect of the present invention, since the edge in the circumferential direction of the tunnel of the surface member is tapered, after inserting the surface member of one ring into the arch support of the grooved cross section, a hitting or pushing means such as a jack As a result, a compressive force in the circumferential direction is applied to the surface member, and the tapered portion (inclined surface) at the end of the surface member produces a wedge action, thereby fixing each surface member. Note that both end tapers of the surface members may be in the same direction to form a substantially parallelogram, or may be changed to a substantially trapezoidal shape. The last surface member to be mounted has a substantially trapezoidal cross section with a narrow width on the inner surface side of the tunnel, and is installed so as to engage with adjacent surface members. Finally, it is desirable to cover the notch for inserting the surface member.
[0024]
According to the fifth aspect of the present invention, the surface member is a member in which the end portions in the tunnel circumferential direction are joined to each other in a continuous manner like the shutter structure, so that it can be wound around a reel or the like for storage or transportation. Moreover, when mounting | wearing with an arch support, it can insert continuously from an insertion port.
[0025]
According to the sixth invention, the grouting material filled between the arch support and the tunnel lining uses a bag body that is flexible and can be deformed within a predetermined range as a formwork material. The work can be securely adhered. Further, there is no need for a sealing material for filling material during construction, and leakage problems can be avoided.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments and examples of the present invention will be described below with reference to the drawings.
FIG. 1 shows an overall configuration in which a protective structure according to an embodiment of the present invention is installed on an upper part of an existing railway tunnel 32 having an arc shape (arch shape) in order to protect the existing lining concrete from peeling off. The configuration is shown.
The protective structure C according to the present invention has an arch support A formed by connecting an arc-shaped arch component member 1 whose upper portion is curved in a shape similar to an arc-shaped tunnel lining inner surface shape in series with a fitting joint 31. A plurality of the arch component members 1 are arranged substantially parallel to each other at predetermined intervals so as to be positioned on a vertical plane perpendicular to the tunnel axis direction along the tunnel axis direction. Arc-shaped continuous grooves 15 along the arc-shaped arch constituent member 1 are provided on the side and rear surface sides), and the surface member 2 of the surface member 2 extends across the grooves 15 of the arch constituent members 1 adjacent in the tunnel axis direction. The end portions are fitted and mounted, and the surface member 2 is stretched between the arch components 1.
[0027]
In this embodiment, the protective structure C is installed only on the inner side surface of the upper arch portion 33 of the existing tunnel 32, and is attached to the concrete floor surface 34 and the tunnel side wall 35 of the corner portion B of the existing tunnel, and the mounting seat 36 c at the lower end portion. A steel reverse L-shaped (shaped) support member 36 in which a horizontal support beam support arm 36b having a horizontal lateral support beam provided with a mounting flange 36a at the front end portion is integrally provided on the upper portion of the leg portion 3. The mounting washer 36c and the mounting flange 36a are fixed to the concrete floor 34 and the tunnel side wall 35 by anchor bolts 37, respectively, and the support members 36 fixed in this way have a predetermined distance in the tunnel axial direction. The support beam support arm 36b is provided with a vertical plate 36d in advance and disposed below the support beam support arm 36b. There has been fixed.
[0028]
A supporting beam 4 having a supporting upper surface 4a such as a grooved steel or a rectangular cross-section member is placed so as to extend in the tunnel axial direction across the supporting beam supporting arms 36b on the left and right sides of the tunnel. The support beam 4 is fixed to the support member 36 by bolts 36e inserted into the through holes 36d and screwed into the female screw holes provided in the support beam 4, and each support beam 4 has a predetermined length in the longitudinal direction. A vertical plate 24a and a guide spring plate 4b on the outside are arranged so as to oppose each other with a gap in the left and right direction, and the lower portions thereof are fixed by welding, and both sides of the tunnel are fixed. The vertical plate 24a is arranged so as to be opposed to the left and right, and supports the lower end portion of the arch support A with the support beam 4 fixed in this manner, and includes the surface member 2 and grout attached to the arch support A. It supports the entire protective structure C, and past the power cable and signal lines 5 of the tunnel side wall.
[0029]
The support structure of the protective structure C by the support beams 4 is configured such that the lower end portion of the lowermost arch component member 1 is placed between the vertical plate 24a fixed to each support beam 4 and the spring plate with guide. In the gripped state, the lower end portion of the arch support A is fixed by a bolt 4b that is inserted into the through hole of the vertical plate 24a and screwed into the female screw hole provided in each lowermost arch component member 1.
[0030]
When the support member 36 does not fit within the limits of construction, as shown in FIG. 2, the bracket 10 having the support beam support arm is fixed to the existing lining concrete wall 6 by anchor bolts 37, etc., and the lower end of the arch support A May be fixed to the existing lining concrete wall 6 via the support beam 4 and the bracket 10.
[0031]
Further, it is sufficient to protect the lining concrete from peeling off only on the upper arch part. However, when the peeling of the side wall 35 is also a protection target, the installation range of the arch support A and the surface member 2 is set to the lower part of the existing tunnel side wall. You can extend it.
[0032]
  Arch support AAlreadyIt is installed with a gap between the tunnel lining concrete wall 6 and is filled with a grout material 7 to make the arch support A uniformly adhere to the existing arch-shaped wall surface 6a in the circumferential direction. ing. The adhesion of the back surface of the arch support by filling the grout material 7 is important for restraining the deformation of the arch support A and reducing the thickness of the arch support A. The means for filling the grout material 7 will be described in detail later.
[0033]
The arch component member 1 constituting the arch support A of the present invention is made of metal such as steel, ductile cast iron, stainless steel, etc., and is curved with substantially the same curvature as the existing tunnel lining inner surface. The both ends of the tunnel circumferential direction are provided with fitting joints 31 and can be joined by plug-in connection. Further, as described above, the side surface of the arch component member 1 is provided with the groove 15 for mounting the surface member 2 or a stepped portion 16 as a modified form thereof.
[0034]
Next, the fitting joint 31 of the arch component 1 will be described.
3A to 3C show the form of the fitting joint.
In the case of Fig.3 (a), it is an insertion joint, Comprising: The convex part 11 and the recessed part 12 of the joint 31 of each arch component member 1 which face each other in the circumferential direction are fitted, and the convex part 11, the recessed part 12, and these joining It joins with the adhesive agent etc. which were applied to the end surface part. It is important that the protrusion length of the convex portion 11 is sufficient to transmit a bending moment.
[0035]
In the case of FIG.3 (b), it is the connection system using the PC steel wire 13, and the convex part 11 and the recessed part 12 for alignment are formed in the joint 31 which faces each other. Further, a through hole 18 through which the PC steel wire is inserted is provided at the center of the cross section of the arch component member 1. After fitting the convex portion 11 and the concave portion 12 of the joint facing each other, the PC steel wire 13 is inserted into the through hole 18 and tension is applied to the PC steel wire 13 with a jack or the like (not shown), thereby compressing the arch component member 1. Acts to bond the members together. Although not shown in the drawings, both ends of the PC steel wire 13 are provided with a through hole in the support beam 4 or the support beam support arm 36b and are inserted into the support beam 4 or in a state of being strained by a center hole jack or the like. It is fixed to the lower surface of the support beam 4 or the support beam support arm 36b by a fixing bracket (not shown).
[0036]
The case of FIG. 3C is an application of the method of FIG. 3A, and the arch component member 1 is formed with a convex portion 11, and a through hole having a length twice as long as the protruding length of the convex portion 11 is formed. The convex part 11 of each arch component member 1 is inserted from both sides of the joint hardware 14 having 14a, and is fixed and joined by an adhesive or the like. In this method, by making the recess 12 that is difficult to process as a separate member, it is possible to facilitate the manufacture of the arch component member 1 and the joint hardware 14 and to increase the manufacturing accuracy.
[0037]
4A to 4D show a cross-sectional form of the arch component 1.
In the case of FIG. 4 (a), the arch constituting member 1 having a substantially section-shaped cross section is formed, and grooves 15 for mounting the surface member 2 are formed on both side surfaces thereof.
In the case of FIG. 4B, a stepped portion 16 for mounting the surface member 2 is formed on the outer surface of the arch component member 1.
The case of FIG. 4C is an application example of FIG. 4A, in which a space 26 is formed in the central portion of the arch component 1, and the hollow arch component 1 is reduced in weight. is there.
The case of FIG. 4D is an application example of FIG. 4C, in which the space 26 in the center of the arch component 1 is filled with mortar or the like 17 to increase the strength. In this embodiment, a through hole 18 through which the PC steel wire 13 is inserted is provided at the center.
[0038]
In the case of FIG. 5, it is a figure explaining the effect | action of the surface member insertion port 9 provided in the arch component member 1 by embodiment of Claim 2. FIG. In this embodiment, the arch component member 1 in which the groove 15 is formed on the side surface is used.
The insertion port 9 is formed by cutting out the opposing positions (same level positions) of adjacent arch supports A by fusing or the like. The insertion port 9 may be formed on site after the assembly of the arch support A. However, when the arch component member 1 is manufactured, it is cut out in advance and can be quickly constructed. The size to be cut out is slightly larger than the width of the surface member 2 in the case of a narrow surface member. Further, in the case of a wide surface member, since it has a curvature, it is not always necessary to cut out over the width of the surface member 2. The surface member 2 is sequentially inserted from the insertion port 9 into the groove 15 of the arch support A, and is installed by sliding the groove 15 as a guide.
[0039]
6 to 10 show the form of the surface member 2.
In the case of FIG. 6, it is the form of the surface member 2 which consists of a board | plate material 20 with a narrow width. The tunnel circumferential end 19 of the surface member 2 is tapered so as to extend in the tunnel axis direction, and is inclined so that one end side approaches each other and the other end side inclines so as to be separated from each other. A surface 19a is formed, and the cross section on the front side of the tunnel is a trapezoidal cross section.
[0040]
In the case of FIG. 7, the wide surface member 2 uses a mesh material 21 with a frame 22. As the mesh material 21, an expanded metal or a thin steel plate assembled in a lattice shape can be used. In the case shown in the figure, the tunnel circumferential end 19 of the surface member 2 is tapered to form a substantially parallel inclined surface 19a, and the cross section on the front side of the tunnel is a substantially parallelogram cross section.
[0041]
In the case of FIG. 8, it is a form of the panel of the composite structure of a metal and concrete with the narrow surface member 2. FIG. The composite structure panel of this embodiment is obtained by placing concrete 23 using a tapered frame 22 and a metal plate 22a such as a thin steel plate on the inner surface side of the tunnel as a form frame and integrating them. In the illustrated case, the cross-sectional shape is a substantially parallelogram-shaped cross section in which the tunnel circumferential end 19 is tapered to form a substantially parallel inclined surface 19a.
[0042]
In the case of FIG. 9, an embodiment of claim 5 is provided, and the arm 24 a is provided at an appropriate interval at the end portion in the tunnel circumferential direction of the surface member 2, and the surface members 2 are mutually pinned at the portion of the arm 24 a ( This is an example of the narrow surface member 2 that is pivotally connected and connected at a horizontal axis 24.
[0043]
In the case of FIG. 10, a thin steel plate having a thickness of 0.8 mm to 1.2 mm, for example, is bent with the narrow surface member 2, and a plurality of T-shaped ribs 25a extending in the tunnel axis direction (not shown) are illustrated. In this example, the deck plate 25 provided in two cases is used, the tunnel circumferential direction end portion 19 is tapered, and the frame 22 provided with the parallel inclined surface 19a is used. By using the deck plate 25, the lightweight and high strength surface member 2 can be obtained.
6 to 10, the components of the surface member 2 (combination of the width and curvature of the surface member 2, the configuration of the inclined surface 19 a, the mesh member 21, the pivot connection by the arm 24 a and the horizontal shaft 24, the deck plate 25). Alternatively, the surface member 2 of another form may be configured by appropriately combining a panel or the like.
[0044]
FIG. 11A is a view for explaining a fixing method of the surface member 2 (in the case of FIG. 6) in which the tunnel circumferential direction end portion 19 is tapered in the embodiment of claim 4. In the arch support A with a grooved cross section, trapezoidal cross-sectional surface members 2 adjacent in the tunnel circumferential direction are alternately arranged in a trapezoidal shape or an inverted trapezoidal shape. By applying a circumferential compressive force to the surface member 2 by pushing means such as a jack (not shown), the tapered portion (inclined surface 19a) at the end of the surface member 2 causes a wedge action, and each surface member 2 is arched. It is fixed to the flange inner surface of the support A. For example, as shown in FIG. 13, the gap generated by the movement of the surface member 2 due to the compression is concentrated (accumulated) in the lower portion of the lowermost surface member 2, so that the groutable bag body 8 a can be supported by the support beam 4. The bottom surface member 2 is placed between the bottom surface member 2 and filled with a grout material 7 such as mortar from the injection port 8b and solidified into the bag body 8a to obtain a state indicated by a two-dot chain line. It is closed by a closing means such as supporting 2 so as not to loosen. If the closing means is a detachable means as described above, the face member can be easily removed even if the face member 2 needs to be replaced.
[0045]
  As for the surface member 2a to be finally mounted before the bag body 8a is installed, the existing tunnel lining 6 side is wide as shown in FIGS. 11B and 11C, for example.AbbreviationAn inverted trapezoidal cross section is provided so as to engage with the surface member 2 adjacent in the vertical direction. It is desirable that the insertion port 9 is closed at the end.
[0046]
FIG. 12 is a diagram for explaining a grouting method for the back surface of the arch support A. FIG.
As described above, securing the adhesion of the back surface of the arch support A to the existing tunnel wall surface 6a by filling the grout material 7 restricts the deformation of the arch constituent member 1 and the arch support A after completion, and the arch constituent member 1 and This is important for reducing the thickness of the arch support A.
[0047]
Normally, the grout material 7 is filled by a method of injecting with a seal material provided with a partition, but it is difficult to set the seal material and leakage is likely to occur. Therefore, for filling the grout material 7 on the back surface of the arch support A in the present invention, the bag body 8 is used as a mold to speed up the construction and ensure the certainty.
[0048]
The bag body 8 is flexible and is preferably filled with the injected grout material 7 and filled in the gap on the back of the arch support A. For example, a synthetic fiber sheet, a material sewed tent fabric, a material such as rubber Can be used. When using a rubber bag, it is better to use a double bag in combination with an outer bag that restrains excessive deformation.
In the case of Fig.12 (a), it is sectional drawing which shows one form when the arch structural member 1 of a grooved cross section is used and the clearance gap of the arch support A back surface is filled.
In the case of FIG. 12B, the arch component 1 having a stepped cross section provided with step portions (steps) on the front side and the rear side in the tunnel axis direction outside the arch component 1 is used. It is sectional drawing which shows one form of the method of fixing simultaneously, such as crimping | bonding the surface member 2 to the arch component member 1 by filling the grout material 7 of the back of the arch support A.
[0049]
As mentioned above, although the form example which applied this invention mainly to prevention of peeling of the existing railway tunnel lining was demonstrated, it can apply similarly also to a road tunnel etc. When it is applied to a road tunnel, if there is a detour, the traffic in the tunnel is closed and the construction becomes easy. However, in the case of construction that allows one-way traffic, it is necessary to devise temporary materials and equipment for construction.
[0050]
When practicing the present invention, as shown in FIG. 14, a wide bag 8 is disposed on almost the entire back surface of the face member 2 in the same manner as described above, and a grout such as a foamed synthetic resin or a mortar is disposed thereon. The material 7 may be filled to restrain the deformation of each surface member 2. In this way, the deformation of the surface member 2 is constrained and the thickness thereof can be reduced, and the rigidity of the peeling protection structure C can be increased by synthesizing.
[0051]
When the protective structure of the present invention is used for the purpose of increasing the lining strength, the back of the arch support A may be backed up as in the first embodiment, but the surface as in the second embodiment. It is advantageous to back up almost the entire rear surface of the member 2.
[0052]
When carrying out the present invention, the thickness of the arch component member 1 in the tunnel radial direction is set to, for example, about 50 mm and 100 mm or less, and the thickness of the surface member 6 is set to, for example, about 30 mm.
[0053]
【The invention's effect】
According to the present invention,
(1) The arch support and the existing lining are brought into close contact with the entire surface in the circumferential direction to restrain deformation, and the lower end of the arch support is fixed and supported on the lining concrete of the existing tunnel by fixing means. Since bending stress is not generated in the arch component and the buckling of the arch component can be prevented, the arch component can be made thin, so that the reduction of the hollow section of the tunnel is within the construction limit. be able to.
[0054]
(2) Use of joints and means that can be easily integrated into any of the means for connecting the arch components, the means for fixing the arch support and the surface member, and the means for close contact with the arch support and the existing lining, and falling during or after construction Since it avoids the use of bolts and wedges that can be used, safety can be ensured and rapid construction can be achieved.
[0055]
(3) As a close contact means between the arch support and the existing lining, a flexible and freely deformable bag body is used as a formwork, so there is no need for a sealant for filling filler during construction. Moreover, it is possible to avoid the trouble of leakage and to perform quick construction. In addition, the arch support and the existing lining can be reliably adhered.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an overall configuration of a form in which a protective structure for protecting peeling of lining concrete is installed on an upper portion of an existing railway tunnel according to the present invention.
FIG. 2 is a perspective view showing an example of a bracket that supports an arch support lower end.
FIG. 3 is a perspective view showing various forms of a fitting joint in an arch constituent member, and (A) is a perspective view showing one form using an insertion joint as a fitting joint of the arch constituent member; B) is a perspective view showing one embodiment using a tight joint made of PC steel wire as a fitting joint for an arch component, and (C) is an insertion using a fitting metal as a fitting joint for an arch component. It is a perspective view which shows one form using a coupling.
4A and 4B show various cross-sectional forms of an arch constituent member, and FIG. 4A is a cross-sectional view showing one form of the arch constituent member when a groove for mounting a surface member is formed on the side surface of the arch constituent member. (B) is a cross-sectional view showing an embodiment of an arch component member in which a step portion for mounting a groove member is formed on the side surface of the arch component member, and (C) is for mounting the surface member on the side surface of the arch component member. It is sectional drawing which shows one form of the cross section of the arch component member which made the groove part of this, and also made the hollow cross section, (D) forms the groove part for surface member mounting in the side surface of an arch component member, and also in a hollow part It is sectional drawing which shows one form of the arch structural member cross section which filled the mortar and formed the through-hole for PC steel wire penetration.
FIG. 5 is an explanatory perspective view showing a process of setting a surface member using a surface member insertion port in an arch component member.
FIG. 6 is a perspective view showing an embodiment of the surface member, and is a perspective view showing an embodiment of the surface member using a narrow plate member.
FIG. 7 is a perspective view showing another form of a surface member using a wide frame mesh material.
FIG. 8 is a perspective view showing another form of a surface member using a composite panel with a frame.
FIG. 9 is a perspective view showing an embodiment of a continuous surface member using a narrow plate material and pin-connected in the tunnel circumferential direction.
FIG. 10 is a perspective view showing an embodiment of a surface member using a deck plate as a narrow framed plate member.
11A and 11B are cross-sectional views showing an embodiment of a fixing method of a surface member with an end taper, FIG. 11A is an explanatory cross-sectional view showing a fixing method of a surface member with an end taper, and FIG. It is sectional drawing which shows the fixing method of the surface member with an edge part taper in the vicinity, and shows the state immediately before and after inserting a surface member, (C) is the member for arch construction by the wedge action by an inclined surface after surface member insertion It is sectional drawing which shows the state crimped | bonded to the flange inner surface in.
FIG. 12 is a cross-sectional view showing a form of a means for filling the gap on the back surface of the arch support, and (A) is a cross-sectional view showing an embodiment of a means for filling the gap on the back face of the arch support having a groove. B) is a cross-sectional view showing an embodiment of a means for fixing the surface member at the same time as filling the gap on the back surface of the arch support having a stepped section.
FIG. 13 is a front view showing one embodiment of the means for filling the gap at the lower end of the surface member, as viewed from the inner side of the tunnel.
FIG. 14 is a perspective view showing an embodiment in the case of filling the arch support and the grout material over the entire back surface of the face member.
FIG. 15 is a perspective view showing an embodiment of a conventional centle reinforcement work.
[Explanation of symbols]
A arch support
B Conner Club
C Protective structure
1 Arch component
2-sided member
2a Last piece of face member
3 legs
4 support beams
24a vertical plate
4b Spring plate with guide
5 Power cables and signal lines
6 Existing tunnel lining
6a Wall surface of arch-shaped existing tunnel
7 Grout wood
8 bags
8a Bag
8b inlet
9 Insertion slot
10 Bracket
11 Convex
12 recess
13 PC steel wire
14 fitting hardware
14a Through hole
15 Groove for mounting surface member
Step part for mounting 16 surface members
17 Mortar etc.
18 PC steel wire insertion through hole
19 Circumferential end
19a Inclined surface
20 Plate material
21 Mesh material
22 frames
22a Thin metal plate
23 Concrete
24 pins (horizontal axis)
25 Deck plate
25a T-shaped rib
26 space
30 cents
31 Mating joint
32 Existing tunnel
33 Upper arch
34 Concrete floor (surface)
35 Tunnel side wall
36 Bearing members
36a Flange for mounting
36b Support beam support arm
36c Mounting plate
37 Anchor bolt

Claims (5)

In a protective structure in which a plurality of arch supports are installed at intervals in the axial direction of the existing tunnel inner surface, and a surface member is disposed between the arch supports to cover the existing tunnel inner surface,
The arch support is formed by fitting a plurality of arc-shaped arch constituent members having fitting joints at end portions in the circumferential direction in series, and a groove for mounting the surface member on a side surface of each arch constituent member There are formed, the lower end of the arch支保is fixed to the existing tunnel by fixing means,
The surface member that spans between the arch supports uses a thin panel of a size that can be mounted in the groove of the arch component member,
At least the back of the arch support is in close contact with the existing tunnel wall surface over the entire surface in the circumferential direction through contact means ,
A tunnel lining peeling protection structure characterized in that at least one surface member insertion port through which a surface member can be inserted into the groove is provided in a part of the arch component member on the inner surface side of the tunnel.   The surface member is a panel such as a metal plate material, a mesh material with a frame, or a composite structure panel of metal and concrete, and a wide material or a flat plate-shaped narrow material formed with a curvature substantially equal to the inner surface of the existing lining. 2. The tunnel lining peeling protection structure according to claim 1, wherein the panel is made of substantially the same curvature as the inner surface of the lining. The surface member is tapered at the edge in the circumferential direction of the tunnel and has an inclined surface. The surface member is crimped to the arch component member by the wedge action between the inclined surfaces of adjacent surface members in the tunnel circumferential direction. 3. A tunnel lining peeling protection structure according to claim 1 or 2, wherein the structure is fixed in a groove of a component member. The surface member mutually adjacent tunnel circumferentially claim 1, characterized in that connected pivotally, and the surface member insertion opening and continuously inserted configurable by another pin or the like tunnel circumferential ends Detachment protection structure for tunnel lining as described.   The contact means for supporting the arch is characterized in that a flexible bag provided on the back surface of the arch component is used as a mold, and the bag is filled and solidified with a grout material. The peeling protection structure for tunnel lining according to claim 1.

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