JPH09195681A - Element for tunnel covering - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an element capable of securing a sufficient space for drilling work and sediment discharge inside, easily carrying out extensional work and certainly preventing dragging of the ground without causing increase of manufacturing cost. SOLUTION: It is a rectangular pipe, an insertion hole 7 to pass through an upper plate 3 and a slit 8 are provided in the neighbourhood of a head end of the upper plate 3 in the drilling direction, and a friction plate 5 is accumulated on an upper surface of the upper plate 3. One end of this friction plate 5 is fixed on an inlet of a drilled hole 11, the other end is inserted into the insertion hole 7 through an upper surface side of the upper plate 3 and reaches a lower surface side of the upper plate 3, inserted into the slit 8 from the lower surface side of this upper plate 3 and reaches the upper surface side of the upper plate 3 again and arranged between the upper plate 3 and the friction plate 5 already arranged on the upper surface side of this upper plate 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel lining element used for constructing a tunnel crossing under a railway, a road or the like.

[0002]

2. Description of the Related Art As a method of constructing a tunnel that crosses under a railway or road, instead of a construction method of constructing a lining body of an integral structure that is not divided by cast-in-place concrete, it has a rectangular cross section and a long length. URT (Under Railway Tunn) which is constructed using a simple tubular tunnel lining element
The construction method has become popular in recent years.

This URT method will be described below. First,
At the starting shaft, an element for tunnel lining (hereinafter simply referred to as "element") is set toward the natural ground, and this element is horizontally excavated to the natural ground by an excavation device arranged behind the element. And the earth and sand of the natural ground is excavated by the cutter provided at the inner tip of the element, and while this earth and sand is transported inside the element and discharged from the rear end, this element is excavated and buried in the state of being penetrated into the natural ground. To do.

In this way, a plurality of elements are pierced into the ground along the lining cross section of the tunnel in a state of being adjacent to each other, and the joints inside and between the elements are filled with concrete and mortar, and the whole plate is printed. To form a tunnel lining body, and excavate and remove the soil inside the tunnel lining body to construct a tunnel.

In this URT method, an element having a friction plate for reducing friction on its upper surface may be used in order to prevent the element upper ground from being dragged by the element during excavation. An example of the element provided with this friction plate is shown in FIG. The element 21 illustrated here is provided with an insertion hole 27 near the tip of the upper plate 3, and the cylindrical member 2 is inserted into the insertion hole 27.
4 is provided.

The friction plate 5 is a long strip, and one end of the friction plate 5 is fixed to an entrance (hereinafter referred to as a start port) 9 of a drill hole formed by this element.
The other end is inserted into the insertion hole 27 through the upper surface of the upper plate 3 of the element 21 and the outer periphery of the cylindrical member 24, reaches the lower surface side of the upper plate 3, and the element inside the element along the lower surface of the upper plate 3. It extends toward the rear end.

A support shelf 25 for supporting the friction plate 5 is provided on the lower surface of the upper plate 3. The friction plate 5 in the element is prepared to have a length corresponding to the entire length of the element and is housed between the support shelf 25 and the upper plate 3. Such element 2
When 1 is dug, the friction plate 5 is sequentially fed forward as the element is dug.

[0008]

In the element 21 having the above-mentioned structure, since the support shelf 25 is formed inside the element 21, the space inside the element is narrow, and it may be difficult to discharge the excavated earth and sand. It was Further, since the structure is complicated, it is disadvantageous in terms of manufacturing cost of the element itself. Moreover, since the propulsion unit 28 for advancing this element is closely attached to the rear end of the element, it is difficult to mount the friction plate 5 longer than the element length so as to project to the rear of the element, and when adding the elements, A similar support shelf must be provided inside the additional element, a friction plate must be provided and connected to the rear end of the friction plate of the previously propelled element. As described above, a lot of connection work such as connection of the excavation mechanism such as the screw conveyor 29, connection of the friction plate, connection welding of the element itself is required, and the work is extremely complicated and difficult.

Therefore, in order to avoid such a problem, as shown in FIG. 7, a feeding roller 33 is provided in the vicinity of the tip inside the element, and the friction plate 5 is wound around the feeding roller 33 to advance the element. According to the above, an element having a structure in which the friction plate is fed from the feeding roller 33 to the upper surface of the element can be considered. However, in such an element 31, since the feeding roller 33 projects inside the vicinity of the tip of the element 31, There was a problem that it hindered the excavation work by the cutter placed in the.

The present invention has been made in view of the above circumstances, and it is possible to secure a sufficient space for excavation work and earth and sand discharge in the element, and to easily add the element and to reduce the manufacturing cost. It is an object of the present invention to provide an element capable of reliably preventing the ground from being dragged without causing the rise of the ground.

[0011]

The tunnel lining element of the present invention has a rectangular tubular shape, and an insertion hole penetrating the upper plate is provided near the tip of the upper plate in the direction of excavation. Of the insertion hole, on the element rear end side, a slit that penetrates this upper plate is provided, and on the upper surface of the upper plate,
In the shape of a long strip, friction plates that reduce the friction between the element and the ground at the time of excavating the element are overlapped, and this friction plate has one end fixed to the entrance of the drill hole and the other end of the upper plate. Through the upper surface side, inserted into the insertion hole, reaches the lower surface side of the upper plate, is inserted into the slit from the lower surface side of the upper plate, and reaches the upper surface side of the upper plate again, and further the upper plate. And the friction plate already disposed on the upper surface side of the upper plate. Further, it is preferable that a plate roller, which is in contact with the friction plate, is rotatably provided in the insertion hole.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the tunnel lining element of the present invention will be described below with reference to the drawings. 1 to 5, reference numeral 1 is a steel element having a rectangular tubular shape and a hollow interior. A plurality of the elements 1 are buried in the natural ground 12 so as to be adjacent to each other to form a tunnel lining body. This element 1
An elongated hole-shaped insertion hole 7 extending in the lateral direction of the element is formed through the upper plate 3 in the upper plate 3 of the blade mouth 2 which is the tip end of the element. The insertion hole 7 is provided with a plurality of engagement grooves 15 formed in the rear end direction of the element. Thin plate-shaped bearings 13 are fitted and joined to the engagement grooves 15, respectively. A shaft 16 fixed to the bearings 13 causes the plate roller 4 to rotate along the extending direction of the insertion hole 7. It is supported freely. The bearing 13 is joined to the engagement groove 15 by welding the joint between the bearing 13 and the engagement groove 15 from the upper surface and the lower surface of the upper plate 3. Further, a slot 8 having a long hole extending in the lateral direction of the element is provided in the insertion hole 7 of the upper plate 3 so as to penetrate the upper plate 3 at a position slightly rearward of the element.

A long strip-shaped friction plate 5 is superposed on the upper surface of the upper plate 3 of the element 1. The friction plate 5 is made of metal such as iron and is in the shape of a thin plate. One end of the friction plate 5 is fixed to the starting port 9, and the other end is inserted into the insertion hole 7 through the upper surface of the upper plate 3 of the element 1. Via the outer periphery of the plate roller 4,
It reaches the lower surface side of the upper plate 3, extends from the lower surface side of the upper plate 3 in the element rear end direction, is inserted into the slit 8 and protrudes to the upper surface side of the upper plate 3, and is already arranged on the upper surface of the upper plate 3. It extends between the friction plate 5 and the upper plate 3 extending toward the rear end of the element, is led out from the rear end of the element, and is wound into a roll here.

FIG. 3 shows a structure in which one end of the friction plate 5 is fixed to the starting port 9.
In the fixing structure 6 shown here, a stopper 6A having a short rod shape for preventing the friction plate 5 from coming off the starting opening 9, a fixing member 6B having a L-shaped cross section, and the fixing member 6B at the starting opening 9. It is composed of a plurality of bolts 6C for fixing. The end portion of the friction plate 5 is wrapped around the stopper 6A and folded back, and is fixed to the starting opening 9 by a bolt 6C via a fixing member 6B together with this folded back portion. With the above structure, one end of the friction plate 5 is firmly held at the starting port 9 even when a tensile force in the element propelling direction is applied to the friction plate 5.

Next, the element 1 thus constructed
The method of digging the ground into the natural ground 12 and the function and effect associated therewith will be described. The element 1 as described above is set toward the natural ground, and the element 1 is horizontally propelled to the natural ground by an excavation device (not shown) such as a jack arranged at the rear of the element, and is provided inside the tip of the element 1. The earth and sand of the natural ground 12 are excavated by the cutter (not shown), and the earth and sand are discharged from the rear end of the element through the inside of the element 1.

In the process of excavating the element, the friction plate 5 arranged on the upper surface of the upper plate of the element 1 is pulled in the excavating direction as the element is excavating. Here, since one end of the friction plate 5 is fixed to the starting port 9, the friction plate 5 is sent out in the element advancing direction from the other end side wound in a roll shape.

According to the above-described excavation method, since the friction plate 5 is interposed between the upper surface of the upper plate of the element 1 and the upper ground 10 in the process of excavating the element, the element 1 and the upper ground 10 are separated from each other. Friction is reduced, and the upper ground 10 due to dragging caused by element excavation
Is prevented. In the above-mentioned excavation method, it is desirable to interpose lubricating oil between the friction plates 5 or between the friction plate 5 and the upper plate 3. This reduces the friction between them and allows the element to be dug more smoothly.

In the element 1 having the above structure, most of the friction plate 5 is arranged outside the element 1, so that the structure for supporting the friction plate 5 inside the element is not necessary. In addition, it does not have a protruding structure inside the element. Therefore, it is possible to secure a sufficient space inside the element for excavation work by the cutter and discharge of earth and sand. Further, there are advantages that the element itself can be easily manufactured and the manufacturing cost can be reduced. Further, since the friction plate 5 is arranged outside the element at the rear end of the element, it is possible to easily add the elements.

[0019]

As described above, the element of the present invention can secure a sufficient space therein for excavation work by a cutter and discharge of earth and sand. Further, the element itself can be easily manufactured, and the manufacturing cost can be reduced. In addition, it is possible to easily add the elements.

[Brief description of the drawings]

FIG. 1 is a sectional view illustrating a structure of an element according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of the element shown in FIG.

FIG. 3 is an enlarged view of a main part of the element shown in FIG.

FIG. 4 is a perspective view of an element according to an embodiment of the present invention.

FIG. 5 is a configuration diagram illustrating a structure of a plate roller of the element according to the embodiment of the present invention.

FIG. 6 is a cross-sectional view illustrating the structure of an example of a conventional element.

FIG. 7 is a cross-sectional view illustrating the structure of an example of a conventional element.

[Explanation of symbols]

 1 ... Element 3 ... Upper plate 4 ... Plate roller 5 ... Friction plate 7 ... Insertion hole 8 ... Slit 11 ... Drilling hole 12 ... Solid ground

Claims (2)

[Claims] 1. A rectangular tubular tunnel lining element for constructing a tunnel lining body by digging and burying it while forming a digging hole in the natural ground, wherein the digging of the rectangular tubular upper plate An insertion hole penetrating this upper plate is provided in the vicinity of the direction tip, a slit penetrating this upper plate is provided on the element rear end side of the insertion hole of the upper plate, and on the upper surface of the upper plate. , A long strip, and friction plates that reduce the friction between the element and the ground during the excavation of the element are superposed. One end of this friction plate is fixed to the entrance of the excavation hole, and the other end is the upper plate. Via the upper side of
It is inserted into the insertion hole, reaches the lower surface side of the upper plate, is inserted into the slit from the lower surface side of the upper plate, and reaches the upper surface side of the upper plate again, and further, the upper plate and this upper plate. An element for tunnel lining, which is arranged between the friction plate arranged on the upper surface side of the. 2. The tunnel lining element according to claim 1, wherein a plate roller that abuts against the friction plate is rotatably provided in the insertion hole.