JP3898999B2 - Tunnel cross-section expansion method and general vehicle protection structure in the tunnel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tunnel cross-section enlargement method and a general vehicle protection structure in a tunnel, and in particular, is used in an existing tunnel cross-section enlargement method and a tunnel in which the cross-section enlargement work of an existing tunnel is performed while the passage of a general vehicle is continued. The present invention relates to a general vehicle protection structure.
[0002]
[Prior art]
In recent years, in order to cope with the renovation work of old tunnels and the increase in traffic volume in road tunnels, construction work of new tunnels with an enlarged cross section of existing tunnels has been carried out. In this case, it is difficult to carry out construction with the traffic blocked for a long time in a tunnel with heavy traffic. So-called hot-line construction is being carried out in which the new tunnel construction is carried out in parallel with the conventional vehicle traffic almost maintained. . In this live line construction, a stationary general vehicle protection structure (hereinafter referred to as a protector) is provided so that ordinary vehicles passing through the existing tunnel and the new tunnel under construction can continue to pass through the new tunnel under construction. Has been built.
[0003]
6 and 7 show a cross-sectional view of an example in which expansion work for an existing tunnel is performed by live lines, and a configuration of a protector constructed in the new tunnel. As shown in FIG. 6, the conventional protector 51 includes a steel gate-type frame having a predetermined strength whose inner cross section is set to ensure the building limit of the existing tunnel 50, a roof portion 52 that covers the frame, and a side surface. As shown in FIG. 7, a general vehicle is installed in a protector 55 installed in a new tunnel 60 under construction from a part of the existing tunnel 50, as shown in FIG. 7. Can travel safely. In addition, construction vehicles such as excavation excavation dump trucks and concrete transport vehicles for secondary lining concrete construction can travel through the construction path 61 in the widened new tunnel.
[0004]
[Problems to be solved by the invention]
By the way, in the conventional protector, since the face 62 which progresses during construction of a new tunnel passes through the whole line of a protector, it is designed by the strong structure so that the whole protector can endure fall of excavation slip. For this reason, the member cost and construction cost of the protector are expensive.
[0005]
In addition, the excavation sludge generated at the face has been carried out of the tunnel tunnel by a dump truck, etc., where the construction vehicle is routed, so it is not possible to continue the lining concrete work behind the face and dismantling the protector. Since it was after the completion of the lining concrete work, the extension of the construction period was a problem.
[0006]
Therefore, the object of the present invention is to solve the above-mentioned problems of the prior art, and to make only a part of the structure strong and move the part so as to correspond to the face position of the new tunnel. An object of the present invention is to provide a cross-section enlargement method and a general vehicle protection structure in a tunnel.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention maintains the passage of a general vehicle in an existing tunnel and a new tunnel, and expands a cross section of the tunnel in which a new tunnel is constructed by widening a surrounding ground on one side of the existing tunnel. In the construction method, the mobile protector unit is connected so as to pass through the existing tunnel and the new tunnel, and the work floor of the tarpaulin construction truck is attached to a part of the roof located at the new tunnel of the connected mobile protector. One end is movably supported, and the waterproof sheet is applied to the primary lining surface of the new tunnel while moving the waterproof sheet construction carriage as the face of the new tunnel progresses . It is characterized by that.
[0008]
At this time, as the new tunnel is excavated, it is preferable that the mobile protector unit is connected and installed over the entire length of the new tunnel.
[0009]
Further, it is preferable that the moving protector unit is connected by a predetermined length along with excavation of the new tunnel, and the connected moving protector is moved as the face moves.
[0010]
Let the general vehicle pass through the existing tunnel and the portal protector installed continuously in the new tunnel constructed by widening excavation of the surrounding ground on one side of the existing tunnel so that the general vehicle can pass In the general vehicle structure in the tunnel, the portal protector has different rigidity and strength corresponding to the load acting on each, and connects the mobile protector units having the same portal outer shape in the tunnel longitudinal direction. A waterproof sheet construction carriage in which one end of a work floor is movably supported by a roof portion of a predetermined movement protector unit, and a slide center at a rear position of the waterproof sheet construction carriage. And the portal protector while the part of the leading mobile protector unit is positioned in the existing tunnel. It is moved with the progress of the working face of the setting tunnel, characterized in that the tarpaulin Paste Engineering and secondary lining construction work to the primary lining surface of the newly tunnels so as to perform at the installation location of the mobile protector And
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a tunnel cross-section enlargement method and an embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows an overall schematic configuration of a general vehicle protection structure 10 in a tunnel deployed in a new tunnel 2 in a tunnel cross-section enlargement work in which a cross section of an existing tunnel is enlarged to construct a new tunnel. The general vehicle protection structure 10 in the tunnel is a gate-shaped mobile protector 10 (hereinafter referred to as a mobile protector 10) that can run on a rail that is composed of four sections having different overall lengths, and is similar to a conventional protector of the same type. The steel portal frame 11 extends in the longitudinal direction, and the steel plate 12 covers the upper surface and side surfaces of the portal frame 11. The cross section of the portal frame 11 is set so as to secure the building limit of the existing tunnel as in the conventional case. Furthermore, rail traveling wheels 14 capable of traveling on the temporary rails 13 laid on the corresponding road surface are equipped at the lower end position of the side surface portion of the portal frame 11. As a result, the entire portal mobile protector 10 can travel in the new tunnel 2 by a towing cart (not shown) that similarly travels on the rail 13. In addition, you may be made to be able to drive with a driving wheel.
[0014]
The portal mobile protector 10 is composed of units having different structures in four sections in the extending direction. The unit structure of each section will be briefly described.
(A section unit 10 </ b> A) Located at the head portion of the portal mobile protector 10, the tip enters the existing tunnel 1. Furthermore, in order to cover the range up to the rear of the face 15 position of the new tunnel 2, large shape steel and thick steel plates are used so that deformation does not occur even if the excavation gap near the face 15 falls directly. .
(B section unit 10B) A predetermined range of the front position of the slide centle 21 (total length 20 m in this embodiment) One end of the sheet bonding construction carriage 20 for constructing the waterproof sheet 5 on the surface of the primary lining is the roof of the protector It comes to support in the part. For this reason, member design is carried out under load conditions that take into account the own weight of the carriage 20, the live load during work, the seat load temporarily placed for construction, and the like.
(C section unit 10C) It occupies the part connecting the A section and the B section and the slide center 21 and the rear part thereof. Since the overload does not act, the construction is such that construction noise can be prevented from leaking into the passage space of the general vehicle 7 and dust can be prevented from diffusing. In this way, each unit is made to correspond in rigidity and strength in accordance with the overload and the magnitude of impact acting on the unit.
[0015]
Further, a horizontal belt conveyor 22 for carrying out excavation sludge is provided along the side of the installed portal moving protector 10. This horizontal belt conveyor 22 passes the excavation slot loaded from a mechanical excavator (not shown) such as a load header performing face excavation through the slide center 21 to the rear end of the gate-type mobile protector 10. At this position, it is replaced with a slip-out dump 31 or the like, and the slip is transported out of the mine. Since the horizontal belt conveyor 22 is attached to the portal moving protector 10, the horizontal belt conveyor 22 can advance integrally with the portal moving protector 10 as the face 15 advances.
[0016]
2 is a construction state explanatory diagram showing an example of an installation procedure of the portal mobile protector 10 accompanying the progress of excavation of the new tunnel 2. First, a rail for running the portal mobile protector 10 is laid before attaching the new tunnel 2 to the wellhead, and the portal mobile protector (A section unit 10A) is installed on the rail. This portal-type mobile protector (A section unit 10A) may be simply suspended on a rail with a lifting machine such as a raft crane, which is assembled in advance near the wellhead.
[0017]
In addition, excavation of the new tunnel 2 will be carried out, but with the progress of the face, the portal type mobile protector (A section unit 10A) is installed so that a part of the head always enters the existing tunnel side from the face of the new tunnel 2 Drive along with the progress of the face 15. Further, as shown in FIG. 2 (b), the portal-type mobile protector 10 (C section, B section unit) is installed in the rear region generated with the advance of the face 15 so that each unit is integrated. (FIG. 2 (b)). Further, the sheet pasting construction carriage 20 is installed so that one end fulcrum thereof is located on the upper part of the gate type moving protector 10 (B section unit). This sheet pasting construction carriage 20 is used for pasting and constructing a waterproof sheet on the surface of the primary lining, and as shown in FIG. 1, the length of the tunnel is within the range of the portal mobile protector (B section unit 10B). Can move in the direction. Moreover, this construction carriage 20 can also be used for the reinforcement work of the secondary lining concrete 6.
[0018]
In FIG. 2 (c), there is a slide centle 21 installed behind the portal mobile protector (B section unit 10B) at the tunnel wellhead, and a portal mobile protector (C section unit 10C) installed further behind it. It is shown. The slide center 21 is a well-known self-propelled formwork for the secondary lining concrete 6 of the new tunnel 2, and a gate type is formed behind it in consideration of the curing period after the lining concrete 6 is removed. A mobile protector (C section unit 10C) is installed. At this time, the C section unit 10C may be installed in the slide center.
[0019]
FIGS. 2D and 2E are explanatory views showing a state in which the entire portal moving protector 10 is assembled and the protector 10 is advanced as the face 15 advances and the lining concrete 6 is placed. It is. In this way, by using this portal mobile protector 10, excavation work of the new tunnel 2 and lining concrete placement work are performed in parallel within the installation range of the portal mobile protector 10, which is efficient. Construction of the new tunnel 2 can be performed.
[0020]
3-5 is explanatory drawing which showed other embodiment of the portal type | mold movement protector 10 used for the cross-section expansion method of the existing tunnel of the comparatively short tunnel extension about 200 m or less, for example.
In this embodiment, as shown in FIGS. 3A to 3C, as the face 15 of the new tunnel 2 advances, portal-type mobile protector units 10 having a predetermined length are sequentially added at the starting side wellhead. And drive through the mine. At this time, the general vehicle 7 can travel in the portal mobile protector 10. When the tunnel has been fully excavated in this way, the portal mobile protector 10 is installed over the entire tunnel. At this point, the addition of the protector at the starting point side is completed. After excavation of the entire line, as shown in FIG. 3 (d), the slide center 21 is installed at the tail end of the portal type moving protector 10 of the tunnel, and the lining concrete 6 is constructed. As the concrete placement progresses, the portal movement protector 10 is advanced, and when the unit of the portal movement protector 10 is completely pulled out from the end side entrance, the unit is separated from the portal movement protector 10 side. Remove from the rail with a crane (not shown). Thus, as shown in FIGS. 3D and 3E, the removal work of the portal moving protector 10 can be performed in parallel with the progress of the construction of the lining concrete 6. For this reason, the overall construction period can be shortened.
[0021]
4 and 5 are explanatory views showing the construction state of the excavation work of the new tunnel 2 by the cross-sectional enlargement method of the existing tunnel using the portal mobile protector 10 shown in FIG. FIG. 4 shows the face excavation work of the new tunnel 2 and the connection installation work of the gate-type mobile protector 10 in the temporary yard at the starting side wellhead. As shown in the figure, a multi-type excavator 30 is provided on the face 15 of the new tunnel 2. This multi-type excavator 30 includes a breaker that crushes the lining concrete of the existing tunnel 1, a load header that cuts the ground face of the new tunnel 2, a piece of concrete fragment, a collection device for excavation sludge, a sludge, etc. The loader loaded on the sludge transport dump that stands by is equipped with a loader, and the lining concrete of the existing tunnel 1 can be crushed, ground excavated, and sludge loaded with a single unit. As shown in FIG. 4A, the slip conveyance dump truck 31 travels on a construction vehicle path provided along the outside of the portal mobile protector 10. On the other hand, in the temporary yard of the wellhead, the work of installing the unit of the gate-type mobile protector 10 assembled in advance to a predetermined length on the temporary rail using a lifting machine 33 such as a rough terrain crane is performed in parallel. In this manner, the units of the gate-type mobile protector 10 are connected and connected one after another at the start side wellhead position, and finally the new tunnel 2 is laid over the entire line while being excavated over the entire line.
[0022]
Each figure of FIG. 5 has shown the placement work of the lining concrete 6 of the new tunnel 2, and the removal work of the portal moving protector 10. FIG. As shown in the figure, as the slide centle 21 progresses, the leading portion of the portal movement protector 10 is pushed out of the tunnel tunnel from the end-side entrance. In the temporary yard outside the mine, a lifting machine 33 similar to the crane described above is provided, and the units of the gate-type mobile protector 10 separated from the head are sequentially removed from the temporary rail. . At this time, in order to place the lining concrete 6, the concrete mixer truck 34 advances into the mine from the top side, and the concrete is placed by the concrete pump truck 35 disposed in the mine.
[0023]
【The invention's effect】
As described above, according to the present invention, when a new tunnel is constructed by enlarging a cross section from an existing tunnel, work can be performed while passing a general vehicle safely, and the process is also conventional. Compared to the same type of enlarged cross-section method, the effect can be greatly shortened.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional perspective view showing an embodiment of a general vehicle protection structure in a tunnel cross-section enlargement method according to the present invention.
FIG. 2 is an explanatory diagram of a construction sequence showing an embodiment of a construction procedure of the tunnel cross-section enlargement method shown in FIG.
FIG. 3 is a partial cross-sectional perspective view showing another embodiment of the general vehicle protection structure in the tunnel cross-section enlargement construction method.
4 is an explanatory diagram showing a face excavation work in a new tunnel and a joint installation work of a gate-type mobile protector in a pit temporary yard in the embodiment of FIG. 3;
5 is an explanatory diagram showing lining concrete placement work for a new tunnel and removal work for a portal moving protector in the embodiment of FIG. 3; FIG.
FIG. 6 is a tunnel cross-sectional view showing an example of a tunnel cross-section enlargement method for widening a part of an existing tunnel.
FIG. 7 is a schematic perspective view showing an example of a general vehicle protection structure in a conventional tunnel cross-section enlargement method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Existing tunnel 2 New tunnel 5 Waterproof sheet 6 Lining concrete 7 General vehicle 10, 10A, 10B, 10C Mobile protector (unit)
13 Rail 14 Running wheel 15 Face 20 Seat construction carriage 21 Slide centle

Claims (4)

In a tunnel cross-section enlargement method in which a conventional tunnel is constructed by widening excavation of surrounding ground on one side of the existing tunnel while maintaining the passage of ordinary vehicles in the existing tunnel and the new tunnel, the existing tunnel and the new tunnel are The mobile protector unit is connected so as to communicate, and one end of the work floor of the waterproof sheet construction carriage is movably supported on a part of the roof portion of the connected mobile protector located in the new tunnel. A tunnel cross-section enlargement method characterized in that the waterproof sheet is attached to the primary lining surface of the new tunnel while moving the waterproof sheet construction carriage as the face of the tunnel moves .   The tunnel cross-section expansion method according to claim 1, wherein the mobile protector unit is connected and installed over the entire length of the new tunnel as the new tunnel is excavated.     2. The tunnel according to claim 1, wherein when the new tunnel is excavated, the mobile protector unit is connected by a predetermined length, and the connected mobile protector is moved as the face moves. Cross section enlargement method. Let the general vehicle pass through the existing tunnel and the portal protector installed continuously in the new tunnel constructed by widening excavation of the surrounding ground on one side of the existing tunnel so that the general vehicle can pass In the general vehicle structure in the tunnel,
The portal protector is composed of a moving protector formed by connecting moving protector units having the same portal-shaped outer shape in the longitudinal direction of the tunnel, having different rigidity and strength according to the load acting on each. The moving protector incorporates a waterproof sheet construction carriage in which one end of the work floor is movably supported on the roof of a predetermined moving protector unit, and a slide center at the rear of the waterproof sheet construction carriage. While the part of the unit is located in the existing tunnel, the portal protector is moved with the progress of the face of the new tunnel, and a waterproof sheet is attached to the primary lining surface of the new tunnel and the secondary A general vehicle protection structure in a tunnel, wherein lining work can be performed at the location where the mobile protector is installed .

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