JP2628587B2 - Propulsion method of tunnel lining element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for propelling a tunnel lining element used for excavating a tunnel crossing a railway or a road under a railway or the like. "Conventional technology" As a method of constructing a tunnel crossing these under a track or a road, there is known a construction method of constructing using a rectangular cross-section element instead of the conventional cast-in-place construction method. Such a construction method uses an excavator that houses a cutter head, screw conveyor, etc. inside the element, excavates the face face in a horizontal direction while excavating the face face, and sequentially penetrates the element into the soil in the form of a portal. After the lining body is constructed, the soil inside the rehabilitating body is excavated and removed. Specifically, this is performed, for example, as shown in FIG.
That is, the propulsion device 3 of the element E is set in the starting shaft 1 via the guide frame 2, and the propulsion device 3 pushes the element E in the horizontal direction while the cutter head 4 at the tip of the element cuts the cutting face into a rectangular cross section. While excavating, the excavated earth and sand is discharged from the distal end side of the trough pipe 6 to the proximal end side by the screw conveyor 5. Here, as shown in FIG. 8, the propulsion device 3 is configured to press-fit the element E and rotate the cutter head 4, and specifically, a main body 3a with a built-in jack and a motor for a conveyor. And a supporting portion 3b which engages with the guide frame 2 and receives the thrust of the jack. The supporting portion 3b has protrusions 3c on both sides thereof which can be inserted into and retracted from the engaging holes 2a of the guide frame, and the cutter head 4 is connected to a tip of the screw conveyor 5. 2 through the worm gear 4a
The structure is such that the set of cutter arms 4b is rotated. "Problem to be Solved by the Invention" The present invention is to solve the following problems in the above-described conventional technology. First, in the above-described technology, in order to press-fit the element E, the propulsion device 3 is provided at the rear end side of the element E with a length corresponding to the propulsion distance of the element E, so that narrow local characteristics are required. There is a problem that the terrain at the site is restricted. In particular, since the guide frame 2 on which the propulsion device 3 is set needs to have a sufficient size to cope with various postures of the element E, the guide frame 2 becomes a particularly large block. I had to make 1 bigger. In addition, in the method using such a conventional propulsion device, the cutter head 4 provided in the element E is required.
And the screw conveyor 5 are driven to guide the earth and sand to the propulsion device 3 side, and the structure for discharging the earth and sand under the propulsion device 3 requires a space under the propulsion device 3 for collecting the soil. However, there is also a problem that the size of the starting shaft 1 must be increased. Secondly, as shown in FIG. 7, the propulsion device 3 for the element E is configured to rotate not only the propulsion of the element E but also the screw conveyor 5, so that the entire device becomes large, and for reinforcement. There is also a problem that the weight increases, such as the necessity of adding flesh. Therefore, a large trailer, a large crane, and the like are required to carry these equipments to the site, and there is also a dissatisfaction that the construction is costly. Thirdly, the propulsion device 3 has many problems such as roofs, handrails, ladders, scaffolds, and the like, and thus lacks mobility, and has a problem that the number of hypothetical works for operating the device also increases. . In particular, when the retaining wall on each side of the starting shaft 1 is supported by bridging cutting beams in the shaft, in order to dispose the elements in the vertical direction while lowering the propulsion device from above, the cutting beams are replaced and the propulsion device is changed. There is also a problem that workability at the site is poor, such as a need to lower it. In addition, apart from the above-mentioned problems, conventionally, when press-fitting the element, the rear end of the guide frame 2 of the excavator is pressed against the rear wall of the starting shaft 1 to obtain a propulsion reaction force. For this reason, the rear wall of the starting shaft 1 also has a problem that a special reinforcing process is required so that the rear wall is in good contact with the excavator and can withstand the propulsion reaction force. The present invention has been proposed in view of the above-mentioned circumstances, and an object thereof is to separate an element press-fitting mechanism and an excavating mechanism for excavated earth and sand to reduce the size of the device and to reduce the size of a narrow site. It is an object of the present invention to provide a method for propelling a tunnel lining element capable of improving the applicability of the element. Means for Solving the Problems In order to achieve the above object, the present invention provides an earth excavator equipped inside a hollow box-type tunnel lining element while horizontally pressing the element into the soil. In the method of propelling the elements one by one while excavating and connecting the elements along the lining section of the tunnel, a tow of a steel rod is attached to the end of the adjacent existing element at the reaching end. When the element is pressed into a position adjacent to the existing element, the tip of a steel rod provided in advance on the side surface of the existing element is connected to the tip of the element located on the starting side, and the steel rod is pulled. It is characterized in that the element is pressed into the soil by being pulled by the device. In addition, in the above-described method for propelling the element for tunnel lining, when the element is press-fitted, a steel rod for next towing is arranged on a side surface of the element to be press-fitted, and a plurality of panel plates are connected in the longitudinal direction of the element. If the steel bar is housed between the side of the element by these panel plates so that it can be freely moved along, the steel bar can be sent to the arrival side simultaneously with the press-fitting of the element,
In this case, it is preferable that the steel bar can be kept in a state of being isolated from the ground by the panel plate. [Operation] According to the above configuration, the element is press-fitted by the traction device attached to the arrival-side tip of the existing element adjacent to the element to be press-fitted, and excavation / discharge of earth and sand is provided inside the element. Since the excavation is performed by the excavator, the press-fitting of the element and the discharging of the excavated earth and sand can be performed separately. At the time of press-fitting the element, the reaction force is taken by the existing element, so that special equipment for taking the reaction force is not required, and the size of the entire apparatus can be easily reduced. In addition, when the steel bar housed on the side surface of the element is connected to the towing device by the panel plate and is towed, the steel plate is towed and the panel plate is extended to the element reaching side. An embodiment of the present invention will be described below with reference to the drawings. The element propulsion method according to the present invention basically includes an excavator such as a cutter head 4 and a screw conveyor 5 in an element E. Is inserted, and the soil is excavated by the cutter head 4 while the element E is pressed into the cylinder horizontally.
Thus, the trough pipe 6 is discharged from the distal end side (left side in FIG. 1) to the proximal end side. However, in the present invention, as a means for press-fitting the element E into the soil, as shown in FIG. When the element E is press-fitted to a position adjacent to the existing element E, the tip of the steel rod W is connected to the tip of the element E located on the starting side, and the steel rod W is pulled by the towing device 10 to pull the element E It is the biggest feature of press-fitting into the soil. First, a description will be given of a preferred traction device 10 used in carrying out this propulsion method. As shown in FIG. 1, the traction device 10 is a fixed base integrally connected to the end of the reaching end of the element E. 11 and a center hole jack 12 that is set on the fixed base 11 and pulls the steel bar W. The connection between the steel bar W and the element E is
This is performed by fixing the steel bar W to a support bracket 21 provided on the element head 20 at the end of the element via fixing means 22 (see FIG. 2). Next, the main members will be described in detail. The fixing base 11 is formed in a hollow box shape having a rectangular cross section similar to the element E, and is fitted to the tip of the existing element E and bolted to the element E. It has been stopped. A support portion 11a for fixing the center hole jack 12 protrudes from the side of the fixed base 11 at the tip of the fixed base 11, and an insertion hole 11b for inserting the steel bar W is formed in the support portion 11a. ing. The center hole jack 12 has a hole through which a steel rod W passes through the center of the ram, and is configured so that the steel rod W can be passed through this hole and pressurized therethrough.
It is driven by hydraulic pressure. On the other hand, the element E towed by the towing device 10
To supplement the description of the element head 20 at the tip of the element, first, the element E is provided with long flat plates E ₁ and E ₁ parallel to each other on the upper and lower surfaces.
₁ , E ₁ , side plates E ₂ , E ₂ are arranged between both side edges to form an integral columnar body having a hollow portion, which protrudes from the side plates E ₂ , E _{2 of} the flat plates E ₁ , E ₁ The inner surfaces of the left and right flanges
A guide rail 15 extending in the longitudinal direction of the element E and a joint member 16 that fits into and out of the guide rail 15 are provided (see FIGS. 4 and 5). Next, the element head 20 mainly includes a flat plate 20a that forms upper and lower surfaces, and a side plate 20b that is disposed on the left and right side edges of the flat plate 20a and that fits on the outer periphery of the side plate of the element E. The inner surface of the tip of the side plate 20b is formed with a tapered surface whose diameter increases toward the tip. On the other hand, the supporting bracket 21 for fixing one end of the steel bar W is provided on the outer peripheral surface of the both side plates 20b on the side in contact with the existing element E, and the third side plate 20b is provided with the third side plate 20b. As shown in the figures, a fixing plate 20c for fixing and fixing one end of the steel bar W to be pulled next time is provided. A fixing means 22 for fixing the support bracket 21 is provided.
As a combination of a crimp grip, nut, anchor plate, etc., which is crimped on the outer periphery of the steel bar W,
A steel rod W that is surely fixed is used. Next, a supplementary description of the excavator mounted in the element E will be given with reference to FIG. 6. The excavator basically includes a cutter head 4 disposed at the tip of the element E, The screw conveyor 5 installed in the element E is mainly constituted, and these are rotatably driven by a drive motor 30 located on the starting side of the element E as shown in FIG. ing. The jack 10 and the drive motor 30 of the excavator
Are configured to be operated by control units provided at the work site, respectively, and by operating the control units, excavation and press-fitting of the element E are controlled. Hereinafter, an element propulsion method for actually constructing a tunnel using the traction device 10 and the excavator having the above-described configuration will be described according to a tunnel construction procedure.

[Promotion of the first element]

When press-fitting the first element, the traction
Since there is no existing element E to which the traction device 10 is attached, first, a support material for attaching the traction device 10 is horizontally disposed in the ground between the starting shaft and the reaching shaft. As this support material, a material suitable for attaching the traction device 10 made of H-shaped steel or the like is applied. The mounting of the support material is performed by first passing a wire from the starting shaft 1 to the reaching shaft by a small-diameter boring, and drawing in the H-shaped steel with the wire, similarly to the boring of a tie rod, an earth anchor, or the like. Then, the center hole jack 12 is attached to the support member via the fixing stand 11, and the preparation for press-fitting the element E is completed. In the method of the present invention, it goes without saying that the guide rail 15 and the joint member 16 are attached in advance to the inner surface of the flange portion of the element E to be press-fitted. When the fixing of the traction device 10 to the support material is completed, the element E to be first press-fitted is set horizontally in the starting shaft, the element head 20 is attached to the tip of the element E, and the traction device 10 is further configured. The center hole jack 12 and the element head 20 are connected via the steel bar W, and the cutter head 4 and the screw conveyor 5 are inserted into the element E. In addition, a steel rod W to be drawn next time is disposed on the side surface of the element E to be press-fitted in parallel with the above operation, and a plurality of panel plates 40 are arranged along the longitudinal direction of the element as shown in FIG. The steel bar W is housed between the side walls of the element E by means of these panel plates 40 so as to be movable. As shown in FIG. 3, the panel plate 40 is installed by fitting the panel plate 40 to the guide rail 15 provided on the flange portion of the element E. Next, the drive motor 30 is controlled by the control unit.
By operating the center hole jack 12 and rotating the cutter arm and the screw conveyor 5 to discharge the excavated earth and sand while excavating the face, and while pressing the element E horizontally by the center hole jack 12, The operation of propelling the element E is executed, and the element E is disposed between the element E and the reaching shaft. At this time (when the element E is pressed into the soil), the steel rod W disposed on the side surface of the element E is stored by the panel plate 40 and is isolated from the ground. No damage when the element is pressed. Further, since the earth and sand do not enter the space sandwiched between the upper and lower flat plates E ₁ and E ₁ by the panel plate 40, the element E can be smoothly pressed.

[Promotion of other elements]

When the first element E is pushed into the ground by the above procedure, the element head 20 at the leading end of the element E is removed, and the fixed base 11 constituting the traction device 10 is attached to the removed position. Then, the steel rod W for the next towing drawn by the element head 20 is not pulled, and its tip is inserted into the hole of the center hole jack 12 to connect the steel rod and the center hole jack 12, and the steel rod W The other end is fixed to the element E to be press-fitted. The intermediary operation of the towing device 10 and the connecting operation of the towing device 10 and the steel bar W are performed by bolting the fixing base 11 to the tip of the element E, and the steel bar W pulled in at the same time as the element E is pressed into the fixing base 11. Center hole jack 12 to be established
In addition, since the size of the traction device 10 itself is small, loading and unloading of the device to and from the site is easy, and workability at the site can be improved. Then, when the attachment of the traction device 10 to the existing element E is completed, the element E to be press-propelled is set horizontally in the starting shaft 1 like the first element E, and the center hole jack 12 and the element The element head 20 attached to the tip of E is connected via a steel bar W, and the cutter head 4
Insert the screw conveyor 5 and the like. At this time, a steel rod W for the next towing is arranged on the side of the element E to be press-fitted, and a plurality of panel plates 40 are movably installed along the longitudinal direction of the element E to mount these panels. It goes without saying that the steel bar W is stored between the element side and the plate 40. The joining operation between the element E to be press-fitted and the steel rod W may be performed by fixing the end of the steel rod W to the support bracket 21 of the element head 20 via the fixing means 22. It can be easily performed. By the way, in order to propel the element E, the drive motor 30 and the center hole jack 12 are operated by the control unit, the cutter arm and the screw conveyor 5 are rotated, and the excavated earth and sand is discharged backward while excavating the face. Then, the element E may be pressed into the center hole jack 12 horizontally. At this time, a panel board built on the side of the element E
As the steel bar W is pulled, 40 is disengaged from the guide rail 15 as shown in FIG. In the propulsion operation of the element E, the traction device 10 is attached to the existing element E, and the reaction force of the center hole jack 12 is applied to the element E. If there is a risk of the element E being pulled out of the ground, a beam or the like made of a channel material or the like is welded to the arrival side of the existing element E, so that the element E is prevented from coming off. In the propulsion operation of the element E, if it is necessary to control the press-in direction of the element E, an H-section steel is arranged in advance below the element to be press-fitted,
The guide projection attached to the lower surface of the element E
What is necessary is just to guide a shape steel.

[Construction of tunnel]

When the elements E are propelled one after another by the above-described procedure and all the elements E are pushed into the ground in the form of a gate, a girder is attached to both ends of the element, and concrete is filled in the element E. Excavates the earth and sand inside the lining body constructed as described above, and performs secondary lining as necessary to complete the tunnel. According to such a method of propelling the element E, the press-fitting operation of the element E is performed by the traction device 10 attached to the reaching end of the existing element E, and the cutting of the face at the tip of the element E is performed inside the element E. Since the cutting is performed by the excavator such as the cutter head 4 and the screw conveyor 5 which are set at the bottom, there is no need to guide the excavated earth and sand under the jack, and it is not necessary to increase the depth of the starting shaft 1. Further, since the press-fitting of the element E and the excavation of the ground are performed separately by separate machines (in the embodiment, the center hole jack 12 and the cutter head 4), it is possible to achieve downsizing of these machines. The terrain at the site is not restricted, and the applicability at a narrow site can be improved. In addition, this makes it possible to reduce the transportation cost of equipment such as an excavating machine, a press-fitting machine, and the like, and also to improve the workability since the handling on site is simple. Furthermore, according to this element propulsion method, the excavating mechanism and the press-fitting mechanism can be configured as separate bodies, respectively. Even if there is, the excavator can be easily pulled out from the inside of the element E, and a worker enters the inside of the element E, and the work of removing an obstacle by input can be performed with good workability. Therefore,
In a case where the obstacle frequently appears in a stratum where the obstacle appears, for example, it is possible to continue propulsion while performing excavation by manpower, and it is possible to perform switching between so-called mechanical excavation and manual excavation very smoothly. . Further, since the press-fitting operation of the element E according to the embodiment is performed by a method of continuously pulling the steel bar W by the pulling device 10, the connection operation between the jack and the element E is required only once, and the workability is further improved. There are advantages such as being able to do. In the above-described embodiment, an example is shown in which an element having a rectangular cross section is used as the tunnel lining element. However, the present invention is not limited to this. Of course, the present invention can also be applied to a cylindrical steel pipe or the like to be used. [Effects of the Invention] As described above, the element propulsion method according to the present invention employs an excavator provided inside the element while horizontally inserting a hollow box-type tunnel lining element into the soil, and using the excavator provided inside the element. In the method of propelling the elements one by one while excavating and connecting the elements along the lining section of the tunnel, a tow of a steel rod is attached to the end of the adjacent existing element at the reaching end. When the element is pressed into a position adjacent to the existing element, the tip of a steel rod provided in advance on the side surface of the existing element is connected to the tip of the element located on the starting side, and the steel rod is pulled. Since the element is pulled into the soil by pulling the element, the element press-fitting mechanism and the excavated soil discharging mechanism are separated. It is possible to reduce the size of the device, and by arranging the press-fitting mechanism in the reaching shaft of the element and the excavator machine in the starting shaft, it is not necessary to make the starting shaft large, and the narrow The applicability of tunnel construction work on site can be improved. Further, the above-mentioned structure can reduce the transportation cost of the apparatus, reduce the size of the starting shaft, facilitate the earth removal process, and improve the maintenance of the apparatus. Further, a steel rod can be simultaneously arranged on the side surface of the element in parallel with the press-fitting operation of the element, and the operation becomes easier as compared with a case where a steel rod is separately arranged. Also, in the above-described tunnel lining element propulsion method, when the element is press-fitted, a steel rod for the next towing is arranged on the side of the element to be press-fitted,
When a plurality of panel plates are movably built along the longitudinal direction of the element and the steel bars are stored between the panel plates and the side surfaces of the elements, the steel bars are grounded by the panel plates. Since it can be maintained in a state of being isolated from the mountain, it has excellent effects such as preventing damage to the steel rod.

[Brief description of the drawings]

1 to 6 are views for explaining an embodiment of a method for propelling an element for tunnel lining according to the present invention, and FIG. 1 is a perspective view showing a state in which the element is being propelled. FIG. 2 is a perspective view showing an attached state of a steel bar and an element head, FIG. 3 is a perspective view showing an operation, and FIG. 4 is a sectional view showing a joint between elements.
FIG. 5 is a cross-sectional view enlarging a circle portion V in FIG. 4, FIG. 6 is a perspective view showing a state where a screw conveyor is inserted into the element, and FIGS. 7 and 8 are diagrams for explaining a conventional propulsion method. FIG. 7 is a cross-sectional view showing the outline thereof, and FIG. 8 is a cross-sectional view showing the structure of the propulsion device. E: Element, 1: Starting shaft, 4: Cutter head, 5: Screw conveyor, 10: Towing device, 11: Fixing table, 11a: Support section, 11b: Insertion hole, 12: Center hole jack 15 Guide rail 16 Joint member 20 Element head 21 Support bracket 22 Fixing means 30 Drive motor 40 Panel panel

Continuation of the front page (72) Inventor Akihiko Miura 2-6-21 Yaesu, Chuo-ku, Tokyo Rose Bay Yaesu Building Ishikawajima Building Materials Industrial Co., Ltd. (56) References JP-A-53-132141 (JP, A) Japanese Utility Model Showa 59-166361 (JP, U)

Claims (2)

(57) [Claims] 1. An element for tunnel lining of a hollow box type is horizontally pressed into the soil while excavating the earth and sand at the tip of the element by an excavator provided inside the element, and the elements are propelled one by one. In the method of building in a state of being connected along the lining section of the tunnel,
A pulling device for a steel rod is attached to the end of the adjacent existing element on the arrival side, and when the element is pressed into a position adjacent to the existing element, a steel rod provided in advance on the side surface of the existing element is used. A method for propelling an element for tunnel lining, wherein a tip is connected to a tip of an element located on a starting side, and the steel rod is pulled by a towing device to press-fit the element into soil. 2. A method for propelling an element for tunnel lining according to claim 1, wherein, when the element is press-fitted, a steel rod to be drawn next time is arranged on a side surface of the element to be press-fitted, and a plurality of panels are provided. A method for propelling a tunnel lining element, wherein a plate is movably built along the longitudinal direction of the element, and the steel bar is stored between the panel plate and a side surface of the element.