JPH11107674A - Entrance packing device for division type adit excavation pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out removal during excavation by dividing an entrance packing device into the plural while installing divided each section through fixed mechanisms. SOLUTION: The whole entrance packing device is divided into two or more, and composed of a brush 8, a brush holder 9, stiffening plates 10, hold-down steel plates 11, 12, a rubber 13, a base plate 14 and bolts 15. When divided each section is assembled, the base plate 14 is mounted and fixed by the bolts 15. The mating surfaces 16 of divided each section are formed in an irregular shape in the radial direction at that time, the surfaces 16 are coated with a caulking agent and fast stuck surely, and the deterioration of a cutoff effect on divided surfaces is prevented. A bent state is maintained so that the entrance packing device is fast stuck on a front propulsion device and the outer circumferential shape of a propulsion pipe during propulsion. Accordingly, the entrance packing device can be used repeatedly when it is employed only when the front propulsion device is inserted because of a divided type, and the workability of removal can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an entrance packing device for a tunnel excavation pipe for preventing the discharge of muddy water or the like from an underground burial opening.

[0002] When excavating a tunnel by the pipe propulsion method, an excavated shaft is used as a starting shaft, and a main pushing device is installed in the shaft. The tube is pushed out into the ground.
In the conventional entrance packing device, as shown in FIGS. 1 to 4, a U-shaped annular casing 3 and a rubber packing 4 are attached to a sheet pile 2 in order to achieve close contact between a wellhead and a propulsion pipe 1. I have. The rubber packing tightly adheres to the outer periphery of the cylindrical propulsion pipe in a bent shape to prevent inflow of mud and the like into the shaft. However, with respect to the tip propulsion device 5 which is not cylindrical, the rubber packing does not correspond to the shape and the gap 6 is formed, so that the water stopping effect cannot be obtained, and there is a risk of inflow of muddy water into the shaft. In view of this, the entrance packing 7 for tunnel excavation prevents the inflow of mud and the like into the shaft by compensating for the gap as shown in FIG.

The conventional entrance packing device for a tunnel excavation pipe is a device for coping with a complicated cross-sectional shape such as a tip propulsion device. This is unnecessary in the situation where the propulsion pipe is inserted. In addition, considering the durability of the ring brush, the caul plate and the like among the components of the entrance packing device, it is desirable to remove the component when it becomes unnecessary. However, at present, due to its structure, it cannot be removed until the end of propulsion.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to make it possible to remove an entrance packing device for tunnel excavation during propulsion.

[0005]

SUMMARY OF THE INVENTION The present invention divides an entrance packing device into two or more parts so that the entrance packing device for a tunnel excavation pipe during propulsion, which was impossible in the related art, can be removed. It is characterized in that a mechanism for fixing each of the divided parts is provided.

[0006]

Next, embodiments of the present invention will be described.
5 and 6 are views for explaining the apparatus of the present invention.
The state in which it is in close contact with the outer periphery of the tip propulsion device having a complicated cross-sectional shape is the same as the state shown in FIG. However, when the cylindrical propulsion tube is inserted, as described above,
Rubber packing can prevent the inflow of muddy water into the shaft and eliminates the need for an entrance packing device for tunnel excavation. Therefore, in the entrance packing device of the present invention,
As shown in FIG. 5, it can be removed even while the propulsion tube is being inserted. This is achieved by making the entrance packing device for tunnel excavation a split type as shown in FIG.
Can be realized.

FIGS. 7 and 8 are views showing an exploded structure of an entrance packing device for split type tunnel excavation. In FIG. 7, 8 is a brush, 9 is a brush holder, 10 is a backing plate,
11 and 12 are holding steel plates, 13 is rubber, 14 is a base plate, 15 is a bolt, and 16 is a mating surface. When assembling the divided parts, the base plate 14 and the like are attached and fixed with bolts 15.

Further, as shown in FIG. 7, the mating surface 16 is made uneven so that a caulking agent is further applied thereon to make it more firmly adhered, thereby preventing a decrease in the water stopping effect due to the division. . Also, as shown in FIG. 8, the brush 8 has a shape protruding from the dividing surface, and the connecting portion has a structure in which the gap is filled with the brush.

[0009] The entrance packing device for tunnel excavation includes:
During propulsion, the distal propulsion device and the propulsion pipe are maintained in a bent state so as to be in close contact with the outer peripheral shape. However, since the backing plate and the brush are made of metal, if the bent state continues as in the case of the conventional device, it remains in the same state after being removed after the propulsion process is completed, and the original shape is not restored. Further, in the case of the conventional device, a considerable amount of the brush falls off due to friction with the propulsion tube or the like. That is, almost all loss is caused by one use.

[0010] The entrance packing device for tunnel excavation of the present invention is of a split type, and therefore can be used only when the tip propulsion device is inserted.
It can be used repeatedly, and the workability at the time of removal is improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a state where a propulsion pipe is inserted into the ground.

FIG. 2 is a diagram illustrating a bending state of a rubber packing when the tip propulsion device is inserted into the ground.

FIG. 3 is a view showing a state in which the entrance packing device for tunnel excavation is removed from a casing.

FIG. 4 is a view showing a state where an entrance packing device for tunnel excavation is installed.

FIG. 5 is a view showing a state in which an entrance packing device for excavating a tunnel according to the present invention is removed.

FIG. 6 is a view showing an entrance packing device for tunnel excavation according to the present invention.

FIG. 7 is a partially exploded view of an entrance packing device for tunnel excavation according to the present invention.

FIG. 8 is a diagram showing a division surface of a brush.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Propulsion pipe 2 Sheet pile 3 Annular casing 4 Rubber packing 5 Tip propulsion device 6 Clearance 7 Entrance packing for tunnel excavation 8 Brush 9 Brush holder 10 Backing plate 11, 12 Pressing steel plate 13 Rubber 14 Base plate 15 Bolt 16 Fitting surface

Claims (2)

[Claims] Claims: 1. An underground burial port into which a tunnel pipe such as a propulsion pipe and a shield drilling machine is inserted, for covering an outer peripheral surface of the tunnel tunnel and preventing ejection of muddy water and the like from the burial port. The entrance packing device according to any one of claims 1 to 3, wherein the entrance packing device is divided into two or more parts so that the entrance packing device can be removed, and a mechanism for fixing each of the divided parts at the time of mounting is provided. . 2. The divided tunnel according to claim 1, wherein the junction of each of the divided portions is formed into a concave-convex shape in the radial direction of the entrance packing, and a caulking agent is applied to surely adhere to each other. Entrance packing device for drilling pipes.