JP2009243125A - Tunnel shock-absorbing construction - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tunnel shock-absorbing construction which reduces a roof structure in weight, suppresses the pressure deformation of the roof structure, and improve the sealing property of the structure to improve its overall performance. <P>SOLUTION: The tunnel shock-absorbing construction 1 is constructed by disposing a hood 3 on a tunnel entrance 2. The hood 3 has a framed structure 4 and a roof 5 fixed to the framed structure 4. The roof 5 is composed of a plurality of upper or lower film deformation suppressing members 11 and 13 which have a periphery fixed by a periphery fixing means 12 and are so arranged as to divide the interior space of the periphery fixing means 12 into a plurality of areas, and flexible belly members or sheet members 7 supported with the upper or lower film deformation suppressing members 11 and 13. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a tunnel shock absorber that can reduce micro-pressure waves generated at a tunnel exit when a moving body such as a high-speed train enters a tunnel.

  When a high-speed train such as the Shinkansen enters the tunnel entrance, a compression wave is generated. When this compression wave propagates through the tunnel and reaches the tunnel exit, a pulsed pressure wave approximately proportional to the pressure gradient of the compression wave is generated from the exit to the outside. To be emitted. This pulsed pressure wave is a so-called micro-pressure wave.

  Compressive waves generated by high-speed trains entering the tunnel entrance have different propagation speeds depending on pressure. When the pressure is low, the propagation speed is slow, and when the pressure is high, the propagation speed is fast. In other words, the low-pressure portion near the tip of the compression wave has a low propagation velocity, and the high-pressure portion behind the compression wave has a high propagation velocity. Gradually catch up. For this reason, even if the waveform of the compression wave is gentle at first, it gradually changes into a sharp shape as it propagates. This is called the nonlinear effect of waves. As the waveform of the compression wave changes to a sharp shape, the pressure gradient of the compression wave increases.

  In the case of a short tunnel, the pressure gradient reaches the tunnel exit with little change, but in the case of a long tunnel, the pressure gradient gradually increases due to the accumulation of nonlinear effects of waves, resulting in a steep waveform. To reach the tunnel exit.

  The radiation of micro-pressure waves not only causes a bursting pneumatic sound (primary sound), but also causes a secondary sound by suddenly moving the windows and doors of private houses near the tunnel exit. Therefore, the reduction is important.

As a specific measure for reducing micro-pressure waves, there is a method of providing a tunnel buffer at the entrance of the tunnel. A tunnel buffer is a hood portion that is approximately 1.4 to 1.5 times the cross-sectional area of the tunnel at the entrance of the tunnel. Since the pressure shock of the compression wave generated at the tunnel entrance can be suppressed small by the tunnel buffer work, the micro-pressure wave at the tunnel exit can be reduced.
JP 2001-248390 A

  The hood part of the tunnel shock absorber disclosed in Patent Document 1 is constructed by forming a frame structure part using H-shaped steel as a main structural member and attaching a steel plate (deck plate or the like) as a roof part to the frame structure part. It has a structure. For this reason, there is a problem that the weight of the roof portion is heavy and the amount of steel used in the frame structure portion that supports the roof portion is increased. Further, it is difficult to widen the interval between the main structural members due to the strength of the roof member. Furthermore, since the roof portion is formed of a steel plate, there is no degree of freedom in designing the shape of the hood portion of the tunnel shock absorber, and there are problems in workability and economy.

  An object of the present invention is to solve the problems of the prior art, to reduce the weight of the structure of the roof part, to suppress deformation due to pressure, to improve the sealing performance, and to provide a tunnel shock absorber with improved performance And

  In order to solve the problems of the prior art, the tunnel shock absorber of the present invention is a tunnel shock absorber in which a hood portion is installed at a tunnel entrance, and the hood portion is fixed to the frame structure portion and the frame structure. A plurality of upper or lower membrane deformation suppressing members arranged so as to divide the inside of the peripheral fixing portion into a plurality of regions. It is characterized by comprising a flexible membrane member or sheet member supported via a side membrane deformation suppressing member.

  Moreover, the tunnel shock absorber according to the present invention fixes the flexible membrane member or sheet member to a panel frame on which a plurality of upper and lower membrane deformation suppressing members are arranged, and the panel frame is attached to the framework structure portion. It is fixed.

  Moreover, the tunnel shock absorber according to the present invention is characterized in that the flexible membrane member or sheet member is fixed to a skeleton structure portion in which a plurality of upper and lower membrane deformation suppressing members are arranged.

  Moreover, the tunnel shock absorber according to the present invention is characterized in that the peripheral fixing means and the upper or lower film deformation suppressing member can be attached and detached to facilitate replacement of the flexible film member or sheet member.

  Further, the tunnel buffer according to the present invention is a reinforcing cloth having a predetermined width extending in a direction intersecting an axial direction of the arrangement of the upper or lower film deformation suppressing member on the front or back surface of the flexible film member or sheet member. Are attached and fixed in at least one row, and a film sagging prevention belt is disposed at a position corresponding to the upper or lower membrane deformation restraining member of the reinforcing cloth, and the membrane sagging prevention belt is attached to the upper or lower membrane deformation restraining member. It is characterized by detachably connecting.

  Moreover, the tunnel shock absorber according to the present invention is characterized in that a seal member is disposed between a fixing portion of the flexible membrane member or sheet member by the peripheral fixing means and the adjacent fixing portion.

  In the tunnel shock absorber according to the present invention, the roof portion in the vicinity of the connection portion between the tunnel entrance and the hood portion is formed of a steel plate.

  With the configuration of the present invention, the roof portion can be reduced in weight, so that the amount of steel used for the frame structure can be reduced, the deformation of the flexible membrane member or sheet member due to pressure fluctuation is suppressed, and the sealing performance of the hood portion is improved. By improving the performance of the tunnel buffer and reducing the length of droop when the flexible membrane member or sheet member is torn, overhead lines, etc. (including equipment such as overhead lines, power lines, communication lines, and trains) Can be prevented.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an overall schematic view of a tunnel buffering work according to the present invention, and FIG. 2 is a schematic view showing a configuration of a hood portion of the tunnel buffering work.

  In the tunnel buffer 1, a hood portion 3 having a cross-sectional area 1.4 to 1.5 times the cross-sectional area of the tunnel is installed at the tunnel entrance 2. The hood part 3 is comprised by the frame structure 4 and the roof part 5 which are formed with structural members 6, such as H-section steel.

  The characteristic configuration of the present invention is that the roof portion 5 of the hood portion 3 of the tunnel shock absorber 1 has a membrane structure formed of a flexible membrane member or a sheet member 7. As the flexible membrane member or sheet member 7 forming the membrane structure, those conventionally used for membrane structures for sports facilities are used. As such a flexible membrane member or sheet member 7, a composite material obtained by coating a resin on a sheet-like material such as a film, a woven fabric, a knitted fabric, and a nonwoven fabric is used. As the fiber constituting the composite material, glass fiber, aramid fiber, polyphenylene sulfide fiber, polyester fiber, and the like, preferably, high strength and heat resistant fiber excellent in weather resistance are used. The resin constituting the composite material is selected from fluororesins, vinyl chloride resins, chloroprene rubber, chlorosulfonated polyethylene rubber, acrylic resins, and the like. Such a resin is compounded by at least one method selected from methods such as impregnation, coating, and lamination on the above-described sheet-like material.

  By making the roof portion 5 into a membrane structure with such a flexible membrane member or sheet member 7, the roof portion 5 can be reduced in weight, and a framework structure that supports the roof portion 5 as the roof portion 5 becomes lighter. The amount of steel used as the structural member 4 can be reduced. Moreover, the freedom degree of design, such as changing a cross-sectional shape and a cross-sectional area so that it changes along the extension direction of the hood part 3, by making the roof part 5 into a film | membrane structure increases.

  FIG. 3 is a cross-sectional view of an embodiment of the hood portion 3 of the tunnel shock absorber 1 of the present invention. The hood part 3 connects the other structural member 6 to the structural member 6 such as an H-shaped steel whose one end is fixed to the base 16 by the attachment plate 14 to form an arch-shaped cross section. In the present embodiment, an arch shape is adopted as the cross-sectional shape of the hood portion 3, but it may be a semicircular shape or a polygonal cross-section. The arch-shaped cross section formed by the structural member 6 is formed at predetermined intervals, and each arch-shaped cross section is connected by a plurality of transverse members to form the skeleton structure portion 4.

  When designing the cross-sectional shape of the framework structure 4 of the hood part 3 and the membrane structure of the roof part 5, the angle and shape of the roof part 5 are set such that the snow that has accumulated on the roof part 5 falls naturally during the snow season. Naturally, the shape and strength to withstand natural disasters such as storms and earthquakes should be taken into consideration. In the vicinity of the connection portion between the hood portion 3 and the tunnel entrance 2, it is desirable to use a steel plate for the roof portion 5 instead of a membrane structure made of a flexible membrane member or a sheet member 7 in consideration of falling objects and the like.

  FIG. 4 is a diagram showing a first embodiment of a paneled membrane structure constituting the roof portion 5. The paneled membrane structure of this embodiment includes a rectangular panel frame 9. The panel frame 9 is formed with a horizontal portion constituting a membrane periphery fixing portion 8 extending inward in a flange portion of a C-shaped steel formed of a thin steel plate. Reinforcing ribs 10 are formed at predetermined intervals in the lower flange portion of the horizontal portion. Further, both ends of the plurality of lower membrane deformation suppressing members 11 are fixed to the flange portion at the lower part of the horizontal portion of the panel frame 9 through fixing means at predetermined intervals between the long sides of the panel frame 9.

  For example, when the length of the long side of the panel frame 9 is 3430 mm and the length of the short side is 2000 mm, a plurality of lower film deformation suppressing members 11 are arranged at intervals of 500 to 600 mm. In this embodiment, the lower film deformation suppressing member 11 is formed of a thin metal pipe such as steel or aluminum having a circular cross section. The lower film deformation suppressing member 11 has a function of suppressing deformation due to pressure of the flexible film member or the sheet member 7 and a function of reinforcing the panel frame 9. The number and the diameter of the lower membrane deformation suppression member 11 are the function of suppressing the deformation of the lower membrane deformation suppression member 11 due to the pressure of the flexible membrane member or the sheet member 7 and the function of reinforcing the panel frame 9. The design is made in consideration of the weight reduction of the roof portion 5 without impairing. Further, in the embodiment shown in FIG. 4, the lower membrane deformation suppressing member 11 is arranged in parallel at a predetermined interval, and a portion surrounded by the membrane periphery fixing portion 8 is partitioned into a plurality of quadrangular regions. However, you may arrange | position so that the part enclosed by the film | membrane periphery fixing | fixed part 8 may be divided into a some triangular, square, or circular area | region.

  The flexible membrane member or sheet member 7 is placed on the membrane periphery fixing portion 8 on the short side and the membrane periphery fixing portion 8 on the long side of the panel frame 9. The flexible membrane member or sheet member 7 on the membrane periphery fixing portion 8 on the short side and the long side of the panel frame 9 is fixed to a plate-like membrane periphery fixing member 12 which is a membrane periphery fixing means with a connecting bolt. To do. The flexible membrane member or sheet member 7 on the lower membrane deformation suppressing member 11 has the upper membrane deformation suppressing member 13 disposed thereon. The connecting portions at both ends of the upper membrane deformation suppressing member 13 are fixed together with the membrane periphery fixing member 12 to the membrane periphery fixing portion 8 on the long side. Both the membrane periphery fixing member 12 and the upper membrane deformation suppressing member 13 are made of metal such as steel or aluminum. In this embodiment, since the upper membrane deformation suppressing member 13 uses a metal pipe having a circular cross section, it is easy to fix to the membrane surrounding fixing portion 8 by using a plate-like end connecting portion. The upper film deformation suppressing member 13 of this embodiment is not fixed to the lower film deformation suppressing member 11, but only by pressing and supporting the flexible film member or sheet member 7 against the lower film deformation suppressing member 11. The flexible membrane member or sheet member 7 is fixed at the periphery thereof by the membrane periphery fixing portion 8 of the panel frame 9 by the membrane periphery fixing member 12 and the connecting bolt, and the plurality of lower membrane deformation suppressing members 11 and the upper membrane. Since it is supported by the deformation suppressing member 13, the deformation inward and outward due to the pressure fluctuation in the hood portion 3 is suppressed, and the performance of the tunnel buffer is improved. Further, when the flexible membrane member or sheet member 7 is replaced, it can be simply implemented by simply removing the membrane periphery fixing member 12, the connecting bolt, and the upper membrane deformation suppressing member 13. In the embodiment shown in FIG. 4, the membrane periphery fixing portion 8 faces upward, and the lower membrane deformation suppressing member 11 is first fixed to the panel frame 9, and the flexible membrane member or sheet member 7 from the upper side of the panel frame 9. However, the upper membrane deformation suppressing member 13 is first fixed to the panel frame 9, and the flexible membrane member or sheet member 7 is fixed from the lower side of the panel frame 9. You may do it. In that case, when exchanging the flexible membrane member or sheet member 7, the membrane surrounding fixing member 12 and the lower membrane deformation suppressing member 13 are removed.

  FIG. 5 is a diagram showing a second embodiment of a paneled membrane structure constituting the roof portion 5. The paneled membrane structure of this embodiment includes a rectangular panel frame 9. The panel frame 9 is formed with a horizontal portion constituting a membrane periphery fixing portion 8 extending inward in a flange portion of C-shaped steel. A reinforcing rib 10 is formed below the horizontal portion. Both ends of the plurality of lower membrane deformation suppressing members 11 are fixed to the lower flange portion of the membrane periphery fixing portion 8 of the panel frame 9 through fixing means at predetermined intervals between the long sides of the panel frame 9. Similar to the embodiment shown in FIG. 4, for example, when the length of the long side of the panel frame 9 is 3430 mm and the length of the short side is 2000 mm, the arrangement distance of the lower membrane deformation suppressing member 11 is 500 to 600 mm. A plurality are arranged at intervals of. In this embodiment, the lower film deformation suppressing member 11 is formed of a metal such as steel or aluminum having a C-shaped cross section. The lower film deformation suppressing member 11 has a function of suppressing deformation due to pressure of the flexible film member or the sheet member 7 and a function of reinforcing the panel frame 9. The number and the diameter of the lower membrane deformation suppression member 11 are the function of suppressing the deformation of the lower membrane deformation suppression member 11 due to the pressure of the flexible membrane member or the sheet member 7 and the function of reinforcing the panel frame 9. The design is made in consideration of the weight reduction of the roof portion 5 without impairing. Further, in the embodiment shown in FIG. 5, the lower membrane deformation suppressing member 11 is arranged in parallel at a predetermined interval, and a portion surrounded by the membrane periphery fixing portion 8 is partitioned into a plurality of quadrangular regions. However, you may arrange | position so that the part enclosed by the film | membrane periphery fixing | fixed part 8 may be divided into a some triangular, square, or circular area | region.

  In this embodiment, the lower membrane deformation suppressing member 11 has a C-shaped cross section, and is arranged so that the horizontal flange portion faces upward. The flexible membrane member or sheet member 7 is fixed to the membrane periphery fixing portion 8 on the short side of the panel frame 9 and the membrane periphery fixing portion 8 on the long side as in the first embodiment shown in FIG. Since there is, description is abbreviate | omitted.

  On the flexible membrane member or sheet member 7 on the lower membrane deformation suppression member 11, a plate-like upper membrane deformation suppression member 13 divided into a plurality in the axial direction of the lower membrane deformation suppression member 11 is arranged. . The plurality of plate-like upper membrane deformation suppression members 13 are fixed to the flange portion of the lower membrane deformation suppression member 11 having a C-shaped cross section with connecting bolts. Other configurations are the same as those of the first embodiment shown in FIG. In the embodiment shown in FIG. 4, the upper membrane deformation suppressing member 13 has a plate shape divided into a plurality of portions in the axial direction of the lower membrane deformation suppressing member 11, but as one upper membrane deformation suppressing member 13 that is not divided. good. Also in this embodiment, the flexible membrane member or sheet member 7 is fixed around the membrane periphery fixing member 12 by the membrane periphery fixing portion 8 of the panel frame 9 and a plurality of lower membrane deformation suppressing members. 11 and the upper film deformation suppression member 13, so that deformation inward and outward due to pressure fluctuations in the hood portion 3 is suppressed, and the performance of the tunnel buffer is improved. In addition, when the flexible membrane member or sheet member 7 is replaced, it can be simply implemented by simply removing the membrane surrounding fixing member 12 and the upper membrane deformation suppressing member 13. Further, since the flexible membrane member or sheet member 7 is partitioned and fixed into a plurality of lower membrane deformation suppression members 11 and upper membrane deformation suppression members 13 in the peripheral fixing portion 8, the flexible membrane member or sheet member 7 is flexible. It is possible to reduce the sag when the membrane member or the sheet member 7 is damaged, and to prevent contact with overhead lines (including overhead lines, power lines, communication lines, etc., and trains). In the embodiment shown in FIG. 5, the membrane periphery fixing portion 8 faces upward, the lower membrane deformation suppressing member 11 is first fixed to the panel frame 9, and the flexible membrane member or sheet member 7 is started from the upper side of the panel frame 9. However, the upper membrane deformation suppressing member 13 is first fixed to the panel frame 9, and the flexible membrane member or sheet member 7 is fixed from the lower side of the panel frame 9. You may do it. In that case, when exchanging the flexible membrane member or sheet member 7, the membrane surrounding fixing member 12 and the lower membrane deformation suppressing member 13 are removed.

  FIG. 6 is a diagram showing a third embodiment of a panel-formed membrane structure that constitutes the roof portion 5. The paneled membrane structure of this embodiment includes a rectangular panel frame 9. The panel frame 9 is formed with a horizontal portion constituting a membrane periphery fixing portion 8 extending inward in a flange portion of C-shaped steel. A reinforcing rib 10 is formed below the horizontal portion. Both ends of the lower film deformation suppression member 11 having a plurality of circular cross sections are fixed below the horizontal portion of the panel frame 9 through fixing means at predetermined intervals between the long sides of the panel frame 9. Similar to the embodiment shown in FIG. 4, for example, when the length of the long side of the panel frame 9 is 3430 mm and the length of the short side is 2000 mm, the arrangement distance of the lower membrane deformation suppressing member 11 is 500 to 600 mm. A plurality are arranged at intervals of. In this embodiment, the lower film deformation suppressing member 11 is formed of a thin metal pipe such as steel or aluminum having a circular cross section. The lower film deformation suppressing member 11 has a function of suppressing deformation due to pressure of the flexible film member or the sheet member 7 and a function of reinforcing the panel frame 9. The number and the diameter of the lower membrane deformation suppression member 11 are the function of suppressing the deformation of the lower membrane deformation suppression member 11 due to the pressure of the flexible membrane member or the sheet member 7 and the function of reinforcing the panel frame 9. The design is made in consideration of the weight reduction of the roof portion 5 without impairing. Further, in the embodiment shown in FIG. 6, the lower membrane deformation suppressing member 11 is arranged in parallel at a predetermined interval, and the portion surrounded by the membrane periphery fixing portion 8 is partitioned into a plurality of quadrangular regions. However, you may arrange | position so that the part enclosed by the film | membrane periphery fixing | fixed part 8 may be divided into a some triangular, square, or circular area | region.

  The flexible membrane member or sheet member 7 is placed on the membrane periphery fixing portion 8 on the short side and the membrane periphery fixing portion 8 on the long side of the panel frame 9. The flexible membrane member or sheet member 7 on the membrane periphery fixing portion 8 on the short side and the long side of the panel frame 9 is connected and fixed to a plate-like membrane periphery fixing member 12 which is a membrane periphery fixing means. . On the back surface side of the flexible membrane member or sheet member 7 of this embodiment, a reinforcing cloth 20 extending in a direction intersecting with the axial direction of the lower membrane deformation suppressing member 11 is fixed by bonding with an adhesive or welding. Yes. The reinforcing cloth 20 may be adhered to the surface side of the membrane member or the sheet member 7.

  In the embodiment shown in FIG. 6, an example in which the reinforcing cloths 20 are bonded and arranged in one row is shown, but the reinforcing cloths 20 may be arranged in a plurality of lines. Since the configuration other than the reinforcing cloth 20 is the same as that of the first embodiment shown in FIG. In the upper film deformation suppressing member 13 of this embodiment, the flexible film member or sheet member 7 is simply pressed against and supported by the lower film deformation suppressing member 11 and is not fixed to the film deformation suppressing bar 11. The periphery of the flexible membrane member or sheet member 7 is fixed by the membrane periphery fixing member 12 at the membrane periphery fixing portion 8 of the panel frame 9, and a plurality of lower membrane deformation suppression members 11 and upper membrane deformation suppression members Since it is supported by the member 13, the inward and outward deformation due to the pressure fluctuation in the hood portion 3 is suppressed, and the performance of the tunnel buffer is improved. In addition, when the flexible membrane member or sheet member 7 is replaced, it can be simply implemented by simply removing the membrane surrounding fixing member 12 and the upper membrane deformation suppressing member 13. In the embodiment shown in FIG. 6, the membrane periphery fixing portion 8 faces upward, and the lower membrane deformation suppressing member 11 is first fixed to the panel frame 9, and the flexible membrane member or sheet member 7 from the upper side of the panel frame 9. However, the upper membrane deformation suppressing member 13 is first fixed to the panel frame 9, and the flexible membrane member or sheet member 7 is fixed from the lower side of the panel frame 9. You may do it. In that case, when exchanging the flexible membrane member or sheet member 7, the membrane surrounding fixing member 12 and the lower membrane deformation suppressing member 13 are removed.

  FIGS. 7A, 7B, and 7C are views showing a state of adhesion of the reinforcing cloth 20 of the embodiment shown in FIG. 6 to the back surface side of the flexible membrane member or sheet member 7. FIG. The film drop prevention belt 21 is flexible at the position corresponding to the lower film deformation suppressing member 11 of the reinforcing cloth 20 by the eyelet punch 22 so that both ends of the belt fall under the reinforcing cloth 20 at a predetermined interval. Alternatively, it is connected to the sheet member 7 and the reinforcing cloth 20. At both ends of the film drop prevention belt 21, a connector 23 is installed.

  As shown in FIG. 7C, the film drop prevention belt 21 is configured to embrace the lower film deformation suppressing member 11 and connect the connecting devices 23 at both ends thereof to the lock device 24 to deform the lower film. Connect to the suppression member 11. The reinforcing cloth 21 reinforces the flexible membrane member or sheet member 7, and in the unlikely event that the flexible membrane member or sheet member 7 is torn, the membrane dropping prevention belt 21 is provided at a plurality of locations of the reinforcing cloth 20. Since it is connected to the lower membrane deformation suppressing member 11, it is possible to prevent the torn flexible membrane member or sheet member 7 from drooping greatly, and the torn flexible membrane member or sheet member 7 can be used as an overhead wire ( (Including equipment such as overhead lines, power lines, communication lines, and trains). As described above, when the upper film deformation suppressing member 13 is first fixed to the panel frame 9, the reinforcing cloth 20 is bonded to the surface side of the flexible film member or sheet member 7, and the film dropping prevention belt 21 is formed thereon. Is fixed by the eyelet punch 22, and the film drop prevention belt 21 is connected to the upper film deformation suppressing member 13. 6 and 7 show an example in which the embodiment of the arrangement of the reinforcing cloth 20 and the film dropping prevention belt 21 is applied to the embodiment shown in FIG. 4, but the reinforcing cloth 20 is applied to the embodiment shown in FIG. The configuration of the film drop prevention belt 21 may be arranged.

  In the tunnel shock absorber 1, the hood portion 3 needs to be sealed to exhibit its performance. FIG. 8 is a diagram showing a configuration for improving the sealing performance of the tunnel buffer 1. A panel frame fixing plate 15 is fixed to a structural member 6 made of H-shaped steel constituting the framework structure portion 4 of the hood portion 3 of the tunnel shock absorber 1 by a fixing means such as a connecting bolt or welding. The panel frame 9 is fixed to both sides of the panel frame fixing plate 15 by fixing means such as a connecting bolt. As for the panel frame 9, the horizontal part which comprises the film periphery fixing | fixed part 8 is extended in the rectangular frame inner direction at the flange part of C-shaped steel. Reinforcing ribs 10 are formed at predetermined intervals on the flange portion of the stock of the membrane periphery fixing portion 8. The periphery of the flexible membrane member or sheet member 7 is placed on the membrane periphery fixing portion 8 of the panel frame 9, and the plate-like membrane periphery fixing member 12 is fixed thereon with a connecting bolt. At that time, an elastic seal member 19 such as rubber or resin is sandwiched between the flexible membrane member or sheet member 7 and the membrane periphery fixing member 12 to seal the peripheral fixing portion of the flexible membrane member or sheet member 7. To do. Further, the sealing iron plate 18 is sandwiched between adjacent panel frames 9 and an elastic seal member 19 such as rubber or resin is sandwiched and sealed to the web portion of the panel frame 9 with a connecting bolt. The edge rope 17 is inserted into the gap between the peripheral fixing portion and the fixing portion of the sealing iron plate 18 to enhance the sealing performance.

  FIG. 9 is a diagram showing time-series changes in the pressure gradient of the tunnel buffer 1 when such a sealing performance improving mechanism is arranged and when it is not arranged. As shown in FIG. 9, in the state where there is no sealing performance improving mechanism, the pressure gradient of the compression wave is increased with the change of the waveform of the compression wave to a sharp shape due to the nonlinear effect of the wave. It can be seen that in the state where the sealing property improving mechanism is arranged, the waveform of the compression wave becomes a gentle shape and the performance of the tunnel buffer is improved.

  Although the description has been made mainly on the case where the flexible film member or the sheet member 7 is arranged on the panel frame 9, without using the panel frame 9, the structural member 6 constituting the framework structure 4 is directly or via a support plate. The upper film deformation suppressing member 13 and the lower film deformation suppressing member 11 may be arranged, and the flexible film member or the sheet member 7 may be fixedly arranged in the configuration described above.

  As described above, the construction of the tunnel buffer 1 of the present invention can reduce the weight of the roof portion 5, thereby reducing the amount of steel used in the frame structure 4, and a flexible membrane member or sheet member 7 due to pressure fluctuations. Sag length when the flexible membrane member or sheet member 7 is torn down by suppressing the inward and outward deformation of the hood, improving the sealing performance of the hood portion 3 to improve the performance of the tunnel buffer 1 By reducing the length, contact accidents with overhead lines (including overhead lines, power lines, communication lines, etc. and trains) can be prevented.

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Explanation of symbols

  1: tunnel buffer, 2: tunnel entrance, 3: hood part, 4: frame structure part, 5: roof part, 6: structural member (H-shaped steel), 7: flexible membrane member or sheet member, 8 : Membrane periphery fixing part, 9: panel frame, 10: reinforcing rib, 11: upper membrane deformation suppressing member, 12: membrane surrounding fixing member, 13: upper membrane deformation suppressing member, 14: attachment plate, 15: panel frame fixing Plate: 16: foundation, 17: edge rope, 18: sealing iron plate, 19: elastic sealing member, 20: reinforcing cloth, 21: membrane drop prevention belt, 22: eyelet punch, 23: coupling tool, 24: locking tool

Claims (7)

Tunnel shock absorber with a hood part installed at the entrance of the tunnel, the hood part comprising a frame structure part and a roof part fixed to the frame structure, the roof part being fixed by surrounding fixing means, Further, a flexible membrane member or sheet member supported by a plurality of upper or lower membrane deformation suppressing members arranged so as to divide the inside fixing portion into a plurality of regions via the upper or lower membrane deformation suppressing members. Tunnel shock absorber, characterized by comprising. 2. The flexible membrane member or sheet member is fixed to a panel frame on which a plurality of upper and lower membrane deformation suppressing members are arranged, and the panel frame is fixed to the skeleton structure portion. Tunnel shock absorber described in 1. The tunnel shock absorber according to claim 1, wherein the flexible membrane member or sheet member is fixed to a skeleton structure portion in which a plurality of upper and lower membrane deformation suppressing members are arranged. The replacement of the flexible membrane member or sheet member is facilitated by allowing the peripheral fixing means and the upper or lower membrane deformation suppressing member to be detachable. The tunnel shock absorber described. At least one row of reinforcing cloth having a predetermined width extending in a direction intersecting the axial direction of the arrangement of the upper or lower membrane deformation suppressing member is bonded and fixed to the front or back surface of the flexible membrane member or sheet member, and the reinforcement A film sagging prevention belt is disposed at a position corresponding to the upper or lower film deformation suppressing member of the cloth, and the film sagging prevention belt is detachably connected to the upper or lower film deformation suppressing member. The tunnel shock absorber according to any one of claims 1 to 4. 6. The seal member according to claim 1, wherein a sealing member is disposed between a fixing portion of the flexible membrane member or the sheet member by the peripheral fixing means and the adjacent fixing portion. Tunnel buffer work. The tunnel shock absorber according to any one of claims 1 to 5, wherein the roof portion in the vicinity of a connection portion between the tunnel entrance and the hood portion is formed of a steel plate.

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