JP2004084343A - Tunnel section enlargement method and general vehicle protection structure in tunnel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform construction work for enlarging the cross section of an existing tunnel while maintaining the passage of general vehicles. <P>SOLUTION: The construction method for enlarging a tunnel cross section includes constructing a new tunnel 2 by digging the natural ground around an existing tunnel 1 to increase its width while maintaining the passage of general vehicles 7 within the existing tunnel 1 and the new tunnel 2. As the working face of the new tunnel 2 progresses, moving protector units 10 which allow general vehicles 7 to pass are connected together into a predetermined length and moved within the new tunnel 2 to construct the new tunnel 2. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a tunnel cross-section enlargement method and a general vehicle protection structure in a tunnel, and is used particularly in an existing tunnel cross-section enlargement method and a tunnel in which an existing tunnel cross-section expansion work is performed while traffic of general vehicles is continued. The present invention relates to a general vehicle protection structure.
[0002]
[Prior art]
2. Description of the Related Art In recent years, in order to cope with the renovation work of an aging tunnel and the increase in traffic volume in a road tunnel, construction work of a new tunnel having an enlarged cross section of an existing tunnel has been performed. In this case, since it is difficult to carry out construction for a long time in a tunnel with a large traffic volume, so-called hot-line construction is being implemented in which a new tunnel construction is carried out in parallel while almost maintaining the conventional vehicle traffic. . In this hot-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. Have been built.
[0003]
FIG. 6 and FIG. 7 show a tunnel cross-sectional view of an example in which enlargement work of an existing tunnel is performed by live lines and a configuration of a protector constructed in a new tunnel. As shown in FIG. 6, a conventional protector 51 includes a steel portal frame having a predetermined strength set to secure the construction limit of an existing tunnel 50 with an inner space cross section, a roof portion 52 that covers the frame, and a side surface. 7 is a stationary steel structure assembled by covering a portion 53 with a steel plate. As shown in FIG. 7, a general vehicle is provided in a protector 55 installed in a new tunnel 60 under construction from a part of the existing tunnel 50. Can run safely. In addition, construction vehicles such as a transport dump of excavation waste and a concrete transportation vehicle for the construction of secondary lining concrete can travel on the construction passage 61 in the newly widened tunnel.
[0004]
[Problems to be solved by the invention]
By the way, in the conventional protector, since the face 62 advancing during construction of the new tunnel passes through the entire line of the protector, the protector is designed to have a strong structure so that the entire protector can withstand the fall of excavation slip. For this reason, the member cost and construction cost of the protector are high.
[0005]
In addition, the excavation waste generated at the face was carried out of the tunnel pit by a construction vehicle aisle dump truck, etc., so that lining concrete work could not be continued behind the face, and dismantling of the protector was also required. Since the completion of the lining concrete work, prolonging the construction period has been a problem.
[0006]
Therefore, an object of the present invention is to solve the above-mentioned problems of the conventional technology, and to manufacture a part of the structure firmly, and to move the part so as to correspond to the face position of the new tunnel. It is an object of the present invention to provide a method for enlarging a cross section 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 is to construct a new tunnel in which the cross section of the tunnel is enlarged by widening and excavating the surrounding ground around the existing tunnel while maintaining traffic of general vehicles in the existing tunnel and the new tunnel. In the tunnel section enlarging method, a moving protector unit that allows the general vehicle to pass along with the face of the new tunnel is connected to a predetermined length and moved while being laid in the new tunnel to move the protector unit. It is characterized by carrying out the construction.
[0008]
At this time, it is preferable that the mobile protector unit is connected and installed along the entire length of the new tunnel along with the excavation of the new tunnel.
[0009]
In addition, it is preferable that the movable protector unit is connected by a predetermined length along with excavation of the new tunnel, and the connected movable protector is moved as the face moves.
[0010]
For the construction of the new tunnel, in a general vehicle protection structure in a tunnel, a general vehicle is allowed to pass through a gate-type protector that is continuously installed in the existing tunnel and the new tunnel so that the general vehicle can pass. The movable protector unit is connected to form a movable protector having a predetermined length, and the distal end of the movable protector is moved as the cutting face of the new tunnel advances while being accommodated in the existing tunnel. And
[0011]
At this time, it is preferable that the rigidity and strength of each unit of the movable protector be changed in the longitudinal direction of the tunnel for connection.
[0012]
It is also preferable that a waterproof sheet construction cart and a slide center are incorporated in a part of the moving protector.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the tunnel section enlarging method and the inside of the tunnel according to the present invention will be described below with reference to the accompanying drawings.
FIG. 1 shows an overall schematic configuration of a general vehicle protection structure 10 in a tunnel provided in a new tunnel 2 in a tunnel cross-section enlarging work for constructing a new tunnel by expanding a cross section of an existing tunnel. The general vehicle protection structure 10 in a tunnel is a portal-shaped movable protector 10 (hereinafter, referred to as a movable protector 10) that can travel on rails having four sections having different lengths, and is similar to a conventional protector of the same type. It is composed of a steel portal frame 11 extending in the longitudinal direction, and a steel plate 12 covering the top and side surfaces of the portal frame 11. The cross section of the portal frame 11 is set so as to secure the construction limit of the existing tunnel as in the conventional case. Further, a rail traveling wheel 14 capable of traveling on a temporary rail 13 laid on a corresponding road surface is provided at a lower end position of a side portion of the portal frame 11. Accordingly, the entire portal-type movable protector 10 can travel in the new tunnel 2 by a towing vehicle (not shown) that similarly travels on the rail 13. In addition, you may make it self-propelled with a drive wheel.
[0014]
The portal movable protector 10 is composed of units having four sections with different structures in the extending direction. The unit structure of each section will be briefly described.
(A section unit 10A) is located at the head of the portal-type mobile protector 10, and the front end enters the existing tunnel 1. Further, in order to cover the area up to the rear of the face 15 of the new tunnel 2, large-sized steel members and thick steel plates are used so that even if an excavated chip near the face 15 directly falls, deformation or the like does not occur. .
(B section unit 10B) A predetermined range of the front position of the slide center 21 (in the present embodiment, a total length of 20 m). It is designed to be supported by the department. For this reason, the members are designed based on the load conditions in consideration of the weight of the bogie 20, the live load during the work, the load of the sheet temporarily placed for construction, and the like.
(C section unit 10C) A part that connects the A section and the B section, the inside of the slide center 21, and the part behind it. Since no overload is applied, the structure is such that construction noise can be prevented from leaking into the traffic space of the general vehicle 7 and dust can be prevented from diffusing. In this way, each unit has its stiffness and strength corresponding to the magnitude of the overload or impact acting on the unit.
[0015]
Further, a horizontal belt conveyor 22 for carrying out the excavation slide is provided along the side of the installed portal-type movable protector 10. This horizontal belt conveyor 22 carries out the excavated pile loaded from a mechanical excavator (not shown) such as a road header which excavates a face through the slide center 21 to the rear end of the portal movable protector 10. At this position, the slip is transferred to the slip discharge dump 31 or the like and the slip is carried out of the mine. Since the horizontal belt conveyor 22 is attached to the portal movable protector 10, the horizontal belt conveyor 22 can advance integrally with the portal movable protector 10 as the face 15 advances.
[0016]
Each figure in FIG. 2 is a construction state explanatory view showing an example of an installation procedure of the gate-shaped movable protector 10 as the excavation of the new tunnel 2 progresses. First, prior to the entrance of the new tunnel 2, a rail for running the portal movable protector 10 is laid, and the portal movable protector (A section unit 10A) is installed on the rail. This portal type movable protector (A section unit 10A) may be simply assembled on a rail near a wellhead in advance by a lifting machine such as a rafter crane.
[0017]
In addition, the excavation of the new tunnel 2 is performed. With the advance of the face, the portal-type movable 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. The vehicle is caused to travel as the face 15 advances. Further, as shown in FIG. 2 (b), a portal-type movable protector 10 (C section, B section unit) is installed in a rear area generated as the face 15 advances, so that the units are integrated. (FIG. 2 (b)). Furthermore, the sheet pasting work cart 20 is installed so that one end fulcrum is located above the gate-shaped movable protector 10 (B section unit). This sheet pasting work cart 20 is used for pasting and carrying a waterproof sheet on the surface of the primary lining, and as shown in FIG. 1, the length of the tunnel within the range of the portal type movable protector (B section unit 10B). Can move in any direction. Further, the construction trolley 20 can be used for a reinforcing work of the secondary lining concrete 6.
[0018]
In FIG. 2 (c), a slide center 21 installed at the back of the portal type movable protector (B section unit 10B) at the tunnel entrance, and a portal type movable protector (C section unit 10C) installed further behind it. It is shown. The slide center 21 is a known self-propelled formwork for the secondary lining concrete 6 of the new tunnel 2, and has a gate-shaped rear portion in consideration of a curing period after the lining concrete 6 is removed. A mobile protector (C section unit 10C) is provided. At this time, the C section unit 10C may be installed in the slide center.
[0019]
FIGS. 2D and 2E are explanatory diagrams showing a state in which the entirety of the portal-type movable protector 10 is assembled, and the entire protector 10 is advanced with the advancement of the face 15 and the placement of the lining concrete 6. It is. As described above, by using the portal movable protector 10, the excavation work of the new tunnel 2 and the lining concrete placing operation are performed in parallel within the installation range of the portal movable protector 10, and the efficiency is improved. The construction of the new tunnel 2 can be performed.
[0020]
FIGS. 3 to 5 are explanatory views showing another embodiment of the portal-type movable protector 10 used for the cross-sectional enlargement method of an existing tunnel having a relatively short tunnel extension of, for example, about 200 m or less.
In this embodiment, as shown in FIGS. 3A to 3C, as the face 15 of the new tunnel 2 advances, the portal-type movable protector unit 10 having a predetermined length is successively added at the starting side wellhead. And run through the mine. At this time, the general vehicle 7 can travel inside the portal-type movable protector 10. At the stage when the entire extension of the tunnel is excavated in this way, the portal-type movable protector 10 is installed over the entire tunnel line. At this point, the addition of the protector at the starting side exit is completed. After the completion of the excavation of the entire line, the slide center 21 is installed at the rear end of the tunnel-shaped movable protector 10 of the tunnel as shown in FIG. With the progress of the concrete placing, the portal-type movable protector 10 is advanced, and when the unit of the portal-type movable protector 10 completely comes out of the end point exit, the unit is separated from the portal-type movable protector 10 side, It is removed from the rail by a crane not shown. In this way, as shown in FIGS. 3D and 3E, the work of removing the portal-type movable protector 10 can be performed in parallel with the progress of the construction of the lining concrete 6. For this reason, the entire construction period can be shortened.
[0021]
FIGS. 4 and 5 are explanatory views showing the construction state of the excavation work of the new tunnel 2 by the cross-section enlargement method of the existing tunnel using the portal-type movable protector 10 shown in FIG. FIG. 4 shows a face excavation work of the new tunnel 2 and a connection installation work of the gate-shaped movable protector 10 in a temporary yard at a starting side entrance. As shown in the figure, a multi-type excavator 30 is provided at the face 15 of the new tunnel 2. The multi-type excavator 30 includes a breaker for crushing the lining concrete of the existing tunnel 1, a road header for cutting the ground face of the new tunnel 2, a concrete crushed piece, a device for collecting excavated scrap, and a scrap for rearward. And a loader to be loaded on a waste transport dumper that is ready to stand by, so that crushing of the lining concrete in the existing tunnel 1, excavation of the ground, and loading of the waste can be performed by one unit. As shown in FIG. 4A, the slip transport dump truck 31 travels along a construction vehicle path provided along the outside of the portal movable protector 10. On the other hand, in the temporary yard at the wellhead, the work of installing the unit of the portal-type movable protector 10 pre-assembled 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 way, the units of the portal-type mobile protector 10 are successively added and connected at the starting-side wellhead position, and finally the new tunnel 2 is laid over the entire line in a state where it is excavated over the entire line.
[0022]
Each figure in FIG. 5 shows the work of placing the lining concrete 6 in the new tunnel 2 and the work of removing the portal-type movable protector 10. As shown in the figure, as the slide center 21 advances, the leading portion of the portal-type mobile protector 10 is pushed out of the tunnel pit from the end side entrance. In the temporary yard outside this mine, a lifting machine 33 similar to the above-described crane is provided, and the units of the gate-shaped movable protector 10 separated from the head are sequentially removed from the temporary rail. . At this time, in order to cast the lining concrete 6, the concrete mixer truck 34 advances into the pit from the head side, and concrete is cast by the concrete pump truck 35 provided in the pit.
[0023]
【The invention's effect】
As described above, according to the present invention, when constructing a new tunnel by enlarging the cross section from the existing tunnel, the work can be performed while safely passing ordinary vehicles, and the process is also the same as the conventional process. There is an effect that the length can be significantly reduced as compared with the same kind of enlarged sectional construction method.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional perspective view showing one embodiment of a general vehicle protection structure in a tunnel cross-section enlarging method according to the present invention.
FIG. 2 is a construction sequence explanatory view showing an embodiment of a construction procedure of the tunnel section enlarging method shown in FIG. 1;
FIG. 3 is a partial cross-sectional perspective view showing another embodiment of the general vehicle protection structure in the tunnel cross-section enlarging method.
FIG. 4 is an explanatory view showing a face excavation work in a new tunnel and a connection installation work of a gate-shaped movable protector in a temporary entrance yard in the embodiment of FIG. 3;
FIG. 5 is an explanatory diagram showing a lining concrete placing operation of a new tunnel and a removing operation of a portal movable protector in the embodiment of FIG. 3;
FIG. 6 is a tunnel sectional view showing an example of a tunnel section enlarging 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 section enlarging method.
[Explanation of symbols]
1 Existing tunnel 2 New tunnel 5 Waterproof sheet 6 Lining concrete 7 General vehicles 10, 10A, 10B, 10C Moving protector (unit)
13 Rail 14 Running wheel 15 Face 20 Seat construction trolley 21 Slide center

Claims (6)

In the tunnel section enlarging method of constructing a new tunnel by widening and excavating the surrounding grounds of the existing tunnel while maintaining traffic of general vehicles in the existing tunnel and the new tunnel, with the progress of the face of the new tunnel, A tunnel protector unit for connecting the general vehicle to a predetermined length, and constructing the new tunnel while moving inside the new tunnel. 2. The tunnel section enlarging method according to claim 1, wherein the movable protector unit is connected and installed over the entire length of the new tunnel along with the excavation of the new tunnel. 2. The tunnel according to claim 1, wherein the mobile protector unit is connected by a predetermined length along with excavation of the new tunnel, and the connected mobile protector is moved as the face moves. 3. Section enlargement method. In a general vehicle protection structure in a tunnel that allows general vehicles to pass through a gate-type protector that is continuously installed in an existing tunnel and a new tunnel, connecting a mobile protector unit to a predetermined structure. A general structure in a tunnel, wherein a movable protector having a length is formed, and the movable protector is moved as the face of the new tunnel advances while accommodating the tip of the movable protector in the existing tunnel. Vehicle protection structure. 5. The general vehicle protection structure in a tunnel according to claim 4, wherein the rigidity and strength of each unit of the movable protector are changed in a longitudinal direction of the tunnel for connection. The general vehicle protection structure in a tunnel according to claim 5, wherein a waterproof sheet construction cart and a slide center are incorporated in a part of the movable protector.

Images