JP6248420B2 - Anti-diffusion device for tunnel - Google Patents

Description

  The present invention relates to a tunnel diffusion prevention device used when excavating a tunnel.

  In mountain tunnel construction, the geology is often composed of rocks, so many excavations by blasting are adopted, but when explosives are exploded, carbon monoxide other than harmless gases such as carbon dioxide and nitrogen Depending on the type of explosive and the type of rock targeted for blasting, various toxic gases such as hydrogen chloride, sulfur dioxide, and hydrogen sulfide are generated.

  Therefore, when performing tunnel excavation by blasting, appropriate safety measures or environmental measures must be taken against these toxic gases, called post-gases, along with a large amount of dust generated at the same time.

  On the other hand, blast waves propagate through the air at the time of blasting, and stepping stones generated by blasting scatter around, so that these blasting and stepping stones do not damage the facilities in the tunnel and It is also essential to take appropriate measures so that safety is not threatened.

  As a measure capable of satisfying such countermeasures for gas and dust and blast and stepping stones, a protective device has been proposed in which a bag filled with air is erected in a wall shape in front of the face (Patent Document 1). ).

  In such a protective device, the space inside the tunnel is partitioned in front of the face to prevent diffusion of back gas or dust from the face side space to the well side space, and ventilation equipment and dust collection installed in the well side space. It is expected to treat the gas and dust with the equipment and protect the ventilation equipment and dust collection equipment from the blast and stepping stones that accompany blasting.

JP 2005-54364 A JP 2012-202092 A

  Here, the bag constituting the protective device is preliminarily formed with an air supply port and an intake port for connecting the face side space to a ventilator side ventilation facility and a dust collector. The air inlet is temporarily blocked, and after blasting, an air supply pipe and an intake pipe are fitted into these and connected to a ventilation facility and a dust collector, and then they are operated to process gas and dust.

  On the other hand, as described above, the protective device has two roles of protecting various facilities from impacts caused by blast and flying stones at the time of blasting, and maintaining the airtightness of the face side space before and after blasting.

  Therefore, when providing the air supply port and the air intake port, it is necessary to prevent the strength of the entire bag body from being lowered and the airtightness from being lowered. In order to meet these requirements, the size of the opening is required. Is as small as possible.

  However, if the air intake and intake ports, especially the intake ports, are too small, the cross-sectional area of the intake pipes connected to them will naturally be small, the energy loss of the pipes will be large, and the processing time of the gas and dust will be long. Such a problem is caused, and in a long tunnel, the influence on the entire process is increased, which causes a delay in the process.

  By the way, when drilling a natural ground with a rock drill called a free section excavator or when drilling a charge hole for loading explosives prior to blasting with a drilling machine called a drill jumbo, Dust is generated in the side space, and for such dust and exhaust gas from heavy machinery, a diffusion prevention device is proposed in which a bag filled with air is erected in the shape of a wall in front of the face as described above. However, even in such a diffusion prevention device, if the air supply port and the intake port, especially the intake port, are too small, the cross-sectional area of the intake pipe connected to them becomes small and the energy loss of the pipe And the same problem that it takes a long time to dispose of dust occurs.

  The present invention has been made in consideration of the above-mentioned circumstances, and is a diffusion for a tunnel that can efficiently treat post-gas, dust, or exhaust gas from heavy equipment without impairing airtightness or even impact resistance. An object is to provide a prevention device.

In order to achieve the above object, a tunnel diffusion prevention device according to the present invention is a face side that is a space that expands in front of the face by being erected at a position separated from the face of the tunnel as described in claim 1. In the diffusion preventing device for a tunnel provided with the diffusion preventing bag body capable of keeping the space airtight with respect to the wellhead side space,
Tunnel digging in which the diffusion preventing bag is configured to have an opening for a dust collector that is opened on the side facing the bottom surface of the tunnel and has a U-shaped periphery, and extends to the face side space When the dust collector for sucking out the generated matter at the time is installed on the bottom surface of the tunnel, the dust collector passes through the dust collector opening, and the periphery of the dust collector is surrounded by the U-shaped peripheral edge. A diffusion preventing bag is constructed.

  The diffusion preventing device for a tunnel according to the present invention includes the diffusion preventing bag body including a bag body and a U-shaped bag body disposed adjacent to the bag body, and the U-shaped bag body. The inner peripheral edge is the U-shaped peripheral edge, and the space surrounded by the inner peripheral edge is the dust collector opening.

  Moreover, the diffusion preventing device for a tunnel according to the present invention is characterized in that one of the upper bag body disposed on the side facing the inner circumferential surface of the top of the tunnel and the lateral inner circumferential surface of the tunnel. A side bag body disposed opposite to the side of the tunnel and a central bag body disposed in the vicinity of the center of the tunnel, and the U-shaped bag body of the side inner peripheral surface of the tunnel , And is configured to be opposed to the other side.

  The tunnel diffusion prevention device according to the present invention includes an attachment frame to which the diffusion preventing bag is attached, and the attachment frame is configured to be movable.

Further, the diffusion preventing apparatus for tunnel according to the present invention is such that when the dust collector is a mobile dust collector, the diffusion preventing bag body moves together with the mobile dust collector when the dust collector is moved. The body is attached to the mobile dust collector.

  In the anti-diffusion device for tunnels according to the present invention, a position separated from the face of the tunnel as in the prior art in order to keep the space that expands in front of the face of the tunnel (hereinafter, face face side space) airtight with respect to the well side space The diffusion prevention bag body of the present invention is provided with a dust collector opening having a U-shaped peripheral edge, and the diffusion prevention bag body is erected. In doing so, the opening side of the dust collector opening is opposed to the bottom surface of the tunnel, and the dust collector is installed on the bottom surface of the tunnel so as to penetrate the dust collector opening, and the periphery of the dust collector is surrounded by a U-shaped peripheral edge.

  In this way, the dust collector installed so as to penetrate the dust collector opening is surrounded by the U-shaped peripheral edge of the dust collector opening, so that the airtightness is not impaired by the dust collector opening. The side space is airtight before and after face excavation.

  On the other hand, in the dust collector, the space connection state with the face side space is not a continuous connection via the suction pipe as in the past, but a direct connection with the suction port exposed to the face side space. Since there is no loss, the suction efficiency is improved, and as a result, it is possible to quickly deal with generated products such as dust and heavy machinery exhaust gas generated during excavation.

  That is, according to the present invention, it is possible to prevent the diffusion of the products generated during tunnel excavation and efficiently perform the treatment without reducing the airtightness.

  The dust collector may be a filter type or an electric type, and it may be an installation type dust collector or a mobile type dust collector. However, since the present invention has no piping loss due to the suction pipe, it needs to be a filter type. In addition, if an electric dust collector is used, power consumption can be greatly reduced.

  It is possible to adopt a configuration in which the bag for diffusion prevention is composed of a single bag, or a single bag that is partitioned inside by a partition wall. Are manufactured in separate bags, the workability when surrounding the dust collector with the U-shaped peripheral edge is improved.

  In manufacturing as described above, the diffusion preventing bag body is composed of a bag body and a U-shaped bag body disposed adjacent to the bag body, and the inner peripheral edge of the U-shaped bag body is formed. It is possible to adopt a configuration in which a space surrounded by the U-shaped peripheral edge and a space surrounded by the inner peripheral edge is used as a dust collector opening. In this case, the bag body can be further configured by a plurality of bag bodies.

  That is, the bag body described above, the upper bag body disposed on the side facing the top inner peripheral surface of the tunnel, and the side bag body disposed to face one side of the side inner peripheral surface of the tunnel, And a central bag body disposed in the vicinity of the center of the tunnel, and the U-shaped bag body described above is configured so as to be opposed to the other side of the side inner peripheral surface of the tunnel. It is possible.

  If the size of the tunnel is small, the diffusion prevention bag body can be configured to stand on its bottom surface, but if it is provided with a mounting base for attaching the diffusion prevention bag body The diffusion prevention bag body can be erected on the bottom surface of the tunnel in a more stable posture, and if the mounting base is configured to be movable, the diffusion of generated substances during excavation in a long tunnel can be prevented. Subsequent processing can be performed more efficiently.

  As a specific example of movably configuring the mounting base, the mounting base is configured to be slidable with respect to the bottom surface of the tunnel, and is arranged so as to be along the axial direction of the tunnel and parallel to each other. A pair of skids and a gantry main body standing on the skid, and the gantry main body standing upright on the upper surface of each skid so as to be spaced apart along the material axis direction of the skid. The side column member and the well side column member, the face side beam member spanned on the top of each face side column member, and the well side beam member spanned on the top of each well side column member That's fine.

  In this way, the diffusion preventing device for tunnels is placed on the bottom surface of the tunnel through the skid, so that it can be easily pulled by an appropriate heavy machine.

  The above-described configuration of the mounting frame is an example suitable for a case where the diffusion preventing bag body is configured by a bag body including an upper bag body, a side bag body, and a central bag body, and a U-shaped bag body. Therefore, the gantry body is diffused between the face side gate type frame composed of each face side column member and face side beam member and the well side gate type frame composed of each well side column member and well side beam member. The prevention bag body is configured to be sandwiched as a whole, the upper bag body is disposed above the face side beam member and the wellhead side beam member, and the side bag body is on the side of the face side column member and the wellhead side column member. One side, the central bag body is suspended from the face side beam member and wellhead side beam member so as to be horizontally movable, and the U-shaped bag body is lateral to the face side column member and wellhead side column member Of these, it is configured to be arranged on the other side.

  The diffusion preventing device for a tunnel according to the present invention is applied to tunnel excavation using a rock drill or a drilling machine, and dust generated at that time and heavy machinery exhaust gas diffuse from the space before the face to the wellhead side space. However, it can also be applied to blast excavation. In that case, it is possible to prevent the gas and dust generated at the time of blasting from diffusing from the space before the face to the wellhead side space. it can.

  When applied to blast excavation, the dust collector is installed so that the suction port of the dust collector faces the face. Therefore, in order to protect the suction port of the dust collector from blast and flying stones, A guard plate is arranged at a position opposite to each other.

  When preventing the diffusion of the products generated during tunnel excavation using the above-described tunnel diffusion prevention apparatus having a movable mounting base, a diffusion prevention bag is required before rock cutting or drilling the tunnel face. The body is erected so that the opening side of the dust collector opening faces the bottom surface of the tunnel, and the movable dust collector is placed on the bottom surface of the tunnel so as to penetrate the dust collector opening and be surrounded by a U-shaped periphery. Place.

  In this way, since both the tunnel diffusion prevention device and the mobile dust collector can move freely, it is possible to quickly prepare measures for preventing the diffusion of generated materials during tunnel excavation by their synergistic action. In long tunnels, the construction period can be greatly shortened.

On the other hand, when the above dust collector is a mobile dust collector, in the configuration in which the diffusion prevention bag body is attached to the mobile dust collector so that the diffusion prevention bag body moves together with the mobile dust collector with the transfer of the dust collector, By simply running the mobile dust collector, the diffusion preventing bag can be moved along with the running.

  The structure for attaching the diffusion preventing bag body to the mobile dust collector is arbitrary, and may be attached directly or via an appropriate mounting base.

  In protecting the tunnel blasting using the tunnel diffusion prevention device described above, before performing the tunnel blasting, the diffusion prevention bag body is erected so that the opening side of the dust collector opening faces the bottom surface of the tunnel, A dust collector is installed on the bottom surface of the tunnel so as to penetrate the dust collector opening and surrounded by a U-shaped peripheral edge, and a protective plate is disposed at a position facing the suction port of the dust collector.

  In the case of the above-described configuration in which the diffusion preventing bag is attached to the mobile dust collector, the mobile dust collector and the diffusion preventing bag attached thereto are appropriately positioned by appropriately running the mobile dust collector, Before carrying out tunnel blasting, a protective plate is placed at a position facing the suction port of the mobile dust collector.

  In this way, the suction port of the dust collector is surely protected from the blast and flying stones at the time of blasting.

  The protective plate can be made of a steel plate having the same shape as or larger than the suction port of the dust collector, and is attached to the dust collector or placed on the bottom of the tunnel. It is optional.

The front view seen from the wellhead side of the diffusion prevention apparatus for tunnels concerning this embodiment. It is the front view similarly seen from the wellhead side of the diffusion prevention device for tunnels, (a) is a diagram showing only the mounting stand of the diffusion prevention device for tunnel, (b) is for diffusion prevention attached to the mounting stand. The figure which showed only the bag. It is the arrow view seen from the AA line direction, (a) is the figure which showed only the mounting stand 4, (b) is a general view. Explanatory drawing which showed the procedure which installs the U-shaped bag body 25. FIG. The figure which showed a mode that it blasts using the diffusion prevention apparatus 1 for tunnels. The figure which showed the modification of the bag body for spreading | diffusion prevention.

  Embodiments of a diffusion preventing apparatus for tunnels according to the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a view showing a tunnel diffusion prevention apparatus according to the present embodiment. As shown in the figure, the diffusion preventing device 1 for a tunnel is provided at a position separated from the face of the tunnel (the rear side of the figure) and placed on the bottom surface 3 of the tunnel, The diffusion preventing bag 5 is attached, and the diffusion preventing bag 5 can be filled with air, and is arranged substantially orthogonal to the axis of the tunnel when the air is filled. It is configured.

  As shown in FIG. 2A, the mounting base 4 is composed of a pair of skids 21 and 21 and a base body 22 erected on them, and the diffusion preventing bag 5 is shown in FIG. As shown in (b), the upper bag body 23 arranged on the side facing the inner peripheral surface of the top of the tunnel and the side inner peripheral surface of the tunnel are arranged to face each other on the right side in the figure. A side bag body 24, a U-shaped bag body 25 arranged opposite to the left side of the figure, and a central bag body 26 arranged in the vicinity of the center of the tunnel. And the center bag body 26 comprises the bag main body of this invention.

  The upper bag body 23 further includes an upper intermediate bag body 23a in which an intake opening 27 is formed and upper side bag bodies 23b and 23c sandwiching the upper intermediate bag body 23a.

  As shown in FIG. 2 (a) and FIG. 3 (a), the skids 21 and 21 are spaced apart from each other along the axial direction of the tunnel and parallel to each other, and are respectively separated from the bottom surface 3 of the tunnel. It is configured to be slidable.

  The gantry body 22 has a total of four facet side column members 31a, 31a and wellhead side column members 31b, 31b standing on the upper surface of each skid 21, 21 so as to be spaced apart from each other along the material axis direction of the skid. The face-side beam members 32a are bridged over the tops of the face-side column members 31a and 31a, and the well-side beam members 32b are bridged over the tops of the well-side column members 31b and 31b.

  Here, the face side column members 31a and 31a and the face side beam member 32a constitute the face side gate type frame 33a, and the well side column members 31b and 31b and the well side beam member 32b constitute the well side gate type frame 33b. The diffusion preventing bag body 5 is configured so as to be sandwiched between the face side gate type frame 33a and the well side gate type frame 33b as shown in FIG. 3 (b).

  Of the bags constituting the diffusion preventing bag 5, the upper bag 23 is disposed above the face side beam member 32a and the wellhead side beam member 32b, and the side bag 24 and the U-shape. The bag body 25 is respectively disposed on the side of the face side column member 31a and the well side column member 31b, and the central bag body 26 is separated from the face side beam member 32a and the well side beam member 32b so as to be horizontally movable. It is arranged to be suspended.

  On the other hand, as shown in FIG. 2, a pair of tensile members 36, 36 are obliquely arranged at diagonal positions of the rectangular opening 35b surrounded by the well-portion-side portal frame 33b so as to be detachable from the well-portion-side portal frame. It is.

  As shown in FIG. 2B, the U-shaped bag body 25 of the diffusion preventing bag body 5 is formed with a dust collector opening 29 having a U-shaped peripheral edge 28 as an inner peripheral edge. And the opening side of the dust collector opening is erected in a posture facing the bottom surface 3 of the tunnel, and the diffusion preventing bag body 5 has an outer peripheral edge portion excluding the U-shaped peripheral edge 28, that is, The upper edge portion of the upper bag body 23, the side edge portion of the side bag body 24, and the side edge portion of the U-shaped bag body 25 are in contact with the inner peripheral surface 6 of the tunnel, respectively. The lower edge is in contact with the bottom surface 3 of the tunnel.

  On the other hand, the dust collector opening 29 is configured such that the U-shaped peripheral edge 28 can surround the dust collector 30 installed on the bottom surface 3 of the tunnel in a contact state.

  In manufacturing each bag body constituting the diffusion preventing bag body 5, it can be appropriately selected from known materials according to elasticity, strength characteristics and other required performances. For example, high strength characteristics Is desirable, it can be composed of polyparaphenylene benzobisoxazole (PBO) fibers sold by Toyobo Co., Ltd. under the name “Zylon (registered trademark)”.

  In order to protect the tunnel blasting using the tunnel diffusion preventing apparatus 1 according to the present embodiment and prevent the diffusion of the product generated at the time of blasting, first, the tunnel diffusion preventing is provided at a position separated from the face by a predetermined distance. The apparatus 1 is installed.

  In order to install the tunnel diffusion prevention device 1, for example, the diffusion prevention bag body 5 is contracted, and in such a state, the tunnel diffusion prevention device 1 is pulled by a heavy machine or the like to appropriately position the tunnel diffusion prevention device. However, since the skid 21 freely slides on the bottom surface 3 of the tunnel during the towing operation, the tunnel diffusion preventing device 1 can be easily positioned.

  Once the tunnel diffusion preventing device 1 is positioned, the upper bag body 23, the side bag body 24 and the central bag body 26 are filled with air among the bag bodies constituting the diffusion prevention bag body 5, respectively. The respective bags are inflated and deployed.

  Specifically, for the side bag body 24, the side bag body is connected to the face side column member 31a and the wellhead side column member 31b by passing the carabiner through the eyelet provided in the bag body, By inflating and deploying air in a state, the side edge portion is brought into contact with the side inner peripheral surface of the inner peripheral surface 6 of the tunnel.

  About the upper bag 23, air is sent in the state which mounted this on the face side beam member 32a and the wellhead side beam member 32b, and it expand | swells and expands, The upper edge is the top part among the inner peripheral surfaces 6 of a tunnel. Contact with the inner peripheral surface. When the upper bag body 23 is inflated and deployed, guide rods 34a and 34b (FIG. 3) erected on the face side beam member 32a and the wellhead side beam member 32b are respectively connected to the face side of the upper side bag bodies 23b and 23c. Air is fed through the guided sleeves (not shown) protruding in a row on the wellhead side. In this way, the upper side bag bodies 23b, 23c can be smoothly deployed upward. An opening closing bag (not shown) is fitted in the intake opening 27 of the upper intermediate bag 23a.

  As for the central bag body 26, a pair of tension members 36, 36 are attached to the portal side gate-type frame 33b and suspended from the face side beam member 32a and the well side beam member 32b, and the face side column member 31a and the well side column member 31b. The central bag body 26 in a contracted state brought close to one side or both sides is pulled horizontally to close the rectangular openings 35a and 35b of the face side gate type frame 33a and the well side gate type frame 33b, and then the central bag body 26 The air is filled with air and expanded.

  On the other hand, the U-shaped bag body 25 is placed in front of the dust collector 30 in a contracted state as shown in FIGS. 4 (a) and 4 (b).

The dust collector 30 is a self-propelled dust collector as a mobile dust collector equipped with an electric dust collector, and is provided with a suction port 41 at a position corresponding to the back side when the driver's seat is the front. A protective plate 42 is attached in a position where the protective plate 42 is taken out or cantilevered, and the U-shaped bag body 25 can be connected in a generally abutting state at the rear end. The U-shaped bag body 25 may be hooked on the rear end portion so as to hang down from both sides and connected to the rear end portion.

  Next, when the dust collector 30 is retracted toward the face side, to the right side in the figure (b), and the rear end of the dust collector 30 reaches the standing position of the tunnel diffusion preventing device 1, as shown in the figure (c). The dust collector 30 is stopped.

  Next, air is fed into the U-shaped bag body 25 and inflated and deployed into the shape shown in FIG. 2B, so that the dust collector 30 is surrounded by the dust collector opening 29, and the U-shaped bag body 25 is surrounded. Of the inner peripheral surface 6 of the tunnel is brought into contact with the inner peripheral surface of the tunnel.

  When the installation of the tunnel diffusion prevention device 1 is completed, the face 51 is blasted and excavated as shown in FIG.

  In this way, the blast and stepping stones generated at the time of blasting mainly act on or collide with the diffusion preventing bag 5, but in the diffusion preventing bag 5, they are instantaneously pushed in response to the impact of the blasting and stepping stones. As a result, the charged air moves inside or is discharged to the outside and the impact energy is absorbed, and the protective plate 42 also acts on or collides with the protective plate 42 according to its elasto-plastic properties. In order to resist the impact force of the blast and stepping stones or absorb the impact energy, the facilities on the wellhead side (not shown) and the dust collector 30 are surely protected from the blast and stepping stones at the time of blasting.

  Further, of the outer peripheral edge portion of the diffusion preventing bag body 5, the outer peripheral edge portion excluding the U-shaped peripheral edge 28 is generally in contact with the inner peripheral surface 6 and the bottom surface 3 of the tunnel. Is in contact with the periphery of the dust collector 30, the face-side space 54 is secured airtight before and after blasting.

  When the blasting is completed, the dust collector 30 is operated to suck the gas and dust after spreading into the face-side space 54, but the dust collector 30 directly exposes the suction port 41 to the face-side space. Since it is a simple connection, post gas treatment or dust treatment can be performed with high efficiency.

  When the face side space 54 is cleaned, the air is removed from the diffusion preventing bag body 5 to contract the diffusion preventing bag body, and then the tunnel 21 is caused to run on the bottom surface 3 of the tunnel with the skid 21. The anti-diffusion device 1 is moved forward by means such as traction toward the newly formed face 51, and the rectangular openings 35a and 35b are exposed so that heavy machinery can pass through the rectangular openings. Start preparing for the next blast.

  In order to allow heavy machinery or the like to travel through the rectangular openings 35a and 35b, the central bag body 26 in an inflated and deployed state is contracted by discharging the filling air from the bag body, and then the central bag body is required. Depending on the side of the tunnel axis, it is horizontally moved along the face side beam member 32a and the wellhead side beam member 32b while being bent into a bowl shape. (In the case of double-opening), the rectangular openings 35a and 35b of the face side gate type frame 33a and the well side gate type frame 33b are exposed, and the pair of tension members 36 and 36 are removed from the well side gate type frame 33b. .

  As described above, according to the diffusion preventing apparatus for tunnel 1 according to the present embodiment, the diffusion preventing method in the tunnel using the same, and the tunnel blast protection method, the blast and stepping stones generated at the time of blasting are diffusion preventing bags. Since it is blocked by the body 5 and the protective plate 42, there is no fear that they will reach the facilities on the wellhead side and the dust collector 30. Out of the outer peripheral edge of the diffusion preventing bag body 5, the outer side excluding the U-shaped peripheral edge 28 is excluded. Since the peripheral edge is generally in contact with the inner peripheral surface 6 and the bottom surface 3 of the tunnel and the U-shaped peripheral edge 28 is in contact with the periphery of the dust collector 30, the face-side space 54 is airtight before and after blasting. Is secured.

  On the other hand, the dust collector 30 is not directly connected to the face side space 54 via the suction pipe as in the prior art, but directly connected with the suction port 41 exposed to the face side space 54. Since there is no piping loss due to the suction pipe, the suction efficiency is improved, and as a result, the post-gas and dust can be quickly processed.

  That is, according to the diffusion preventing device for tunnel 1 according to the present embodiment, the diffusion preventing method in the tunnel using the same, and the tunnel blast protection method, impact resistance and airtightness which are functions of the diffusion preventing bag 5 are provided. It is possible to efficiently treat the post gas and dust while ensuring sufficient.

  In addition, according to the tunnel diffusion preventing device 1 according to the present embodiment, the diffusion preventing bag body 5 includes a bag body including the upper bag body 23, the side bag body 24, and the central bag body 26, and a U-shape. Since the bag body 25 is configured, the U-shaped peripheral edge 28 of the dust collector opening 29 formed in the U-shaped bag body can be brought into contact with the dust collector 30 reliably and quickly.

  Moreover, according to the tunnel diffusion preventing apparatus 1 according to the present embodiment, the diffusion preventing bag body 5 is attached to the mounting base 4 in such a manner as to be sandwiched between the face side gate type frame 33a and the wellhead side gate type frame 33b. Therefore, even when the tunnel scale is large, the diffusion preventing bag body 5 can be stabilized in the standing posture, and the tunnel diffusion preventing device 1 is connected to the bottom surface 3 of the tunnel via the skid 21. Therefore, it is possible to easily tow and move with an appropriate heavy machine, and thus it is possible to more efficiently perform blast protection in a long tunnel.

  Further, according to the tunnel diffusion prevention device 1 according to the present embodiment, the pair of tensile members 36, 36 are arranged at diagonal positions of the rectangular opening 35b surrounded by the well-portion-side portal frame 33b. Even if the vehicle can pass through 35a and 25b, it is possible to prevent the lower edge of the central bag body 26 from turning up due to an impact at the time of blasting, and to ensure impact resistance and airtightness. Become.

  Moreover, according to the diffusion preventing method in the tunnel according to the present embodiment, the tunnel diffusion preventing device 1 provided with the mounting base 4 is used, and the dust collector 30 is constituted by a self-propelled dust collector. Both the device 1 and the dust collector 30 are configured to be movable, and through their synergistic action, the tunnel blast protection work can be quickly prepared, and the process is greatly increased in long tunnels that require repeated blasting. It becomes possible to shorten to.

  In the present embodiment, the U-shaped bag body 25 is preceded by the dust collector 30. However, instead of this, the U-shaped bag body 25 may be preceded by the attachment frame 4, or the dust collector 30 is positioned on the attachment frame 4. Thereafter, the U-shaped bag body 25 may be attached to the dust collector 30 and the mounting base 4 at the same time.

  In the present embodiment, the diffusion preventing bag 5 is constituted by the bag main body including the upper bag 23, the side bag 24 and the central bag 26, and the U-shaped bag 25. Is a case where a large-scale tunnel is assumed, and in the case of a small-scale tunnel, there is no need for the bag body to be composed of a plurality of bags, as shown in FIG. 6 (a). The diffusion prevention bag body 5a comprising the main body 61 and the U-shaped bag body 25 disposed adjacent to the bag body may constitute the diffusion prevention bag body of the present invention. Even if the bag body is not composed of a plurality of bag bodies including a U-shaped bag body, the U-shaped peripheral edge 28 is opened on the side facing the bottom surface 3 of the tunnel as shown in FIG. The diffusion preventing bag body 5b in which the dust collector opening 29 having the above is formed may constitute the diffusion preventing bag body of the present invention.

  In the present embodiment, the diffusion preventing bag 5 is attached to the movable mounting base 4 and the movable dust collector 30 is adopted as the dust collector, so that the mobility at the time of relocation is improved. Instead of this, the diffusion preventing bag 5 may be attached to the movable dust collector 30 so as to pass through the dust collector opening 29 and surrounded by the U-shaped peripheral edge 28.

  In such a configuration, the tunnel diffusion prevention device 1 can be moved forward and backward by the driving force of the dust collector 30, so that the relocation accompanying the progress of tunnel excavation can be performed more quickly, and the above-described mobility is further improved. To do.

  The configuration for attaching the diffusion preventing bag body 5 to the dust collector 30 is arbitrary. For example, the above-described gantry main body 22 is connected to the dust collector 30 and the gantry main body has the same diffusion proof bag as described above. It is possible to adopt a configuration for attaching the body 5, and by connecting the mounting base 4 to the dust collector 30, the weight of the tunnel diffusion prevention device 1 does not act on the dust collector 30, but skids 21 and 21. It is also possible to configure so as to be partially burdened.

  Further, in this embodiment, the tunnel diffusion prevention device according to the present invention is used for protection against tunnel blasting. Instead, as a countermeasure against dust generated by excavation and drilling by a rock drill, A tunnel diffusion prevention device may be used.

DESCRIPTION OF SYMBOLS 1 Tunnel diffusion prevention device 3 Tunnel bottom surface 4 Mounting frame 5, 5a, 5b Diffusion prevention bag body 6 Tunnel inner peripheral surface 21 Skid 22 Mounting body body 23 Upper bag body 24 Side bag body 25 U-shaped bag body 26 Central bag body 28 U-shaped peripheral edge 29 Dust collector opening 30 Dust collector 31a Faceted side column member 31b Wellhead side column member 32a Faceted side beam member 32b Wellhead side beam member 33a Faceted side gate type frame 33b Wellhead side gate type frames 35a, 35b Rectangular Opening 42 Guard plate 51 Face

Claims (5)

For tunnels equipped with a diffusion prevention bag body that can hold the face side space , which is a space extending in front of the face face , airtightly with respect to the pit side space by standing upright from the face of the tunnel In the diffusion prevention device,
Tunnel digging in which the diffusion preventing bag is configured to have an opening for a dust collector that is opened on the side facing the bottom surface of the tunnel and has a U-shaped periphery, and extends to the face side space When the dust collector for sucking out the generated matter at the time is installed on the bottom surface of the tunnel, the dust collector passes through the dust collector opening, and the periphery of the dust collector is surrounded by the U-shaped peripheral edge. A diffusion preventing device for a tunnel, characterized in that a diffusion preventing bag is constructed. The diffusion preventing bag is composed of a bag main body and a U-shaped bag disposed adjacent to the bag main body, and the inner periphery of the U-shaped bag is the U-shaped peripheral edge. The tunnel diffusion preventing device according to claim 1, wherein a space surrounded by the inner peripheral edge is used as the dust collector opening. The bag body, the upper bag body disposed on the side facing the inner peripheral surface of the top of the tunnel, and the side bag body disposed to face one side of the side inner peripheral surface of the tunnel, The U-shaped bag body is configured so as to be opposed to the other side of the side inner peripheral surface of the tunnel. The tunnel diffusion prevention apparatus according to claim 2. The tunnel diffusion prevention device according to any one of claims 1 to 3, further comprising an attachment frame to which the diffusion preventing bag body is attached, wherein the attachment frame is configured to be movable. The diffusion preventing bag is attached to the mobile dust collector so that the diffusion preventing bag moves together with the mobile dust collector when the dust collector is a mobile dust collector. The diffusion prevention apparatus for tunnels as described in any one of Claims 3-4.

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