JPH0545675Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a sealing device for a gable in a shielding machine, particularly a type of shielding machine in which the lining is performed using directly poured concrete.

(Prior Art) Conventionally, in this type of shield machine, an annular end frame is provided on the inner circumferential surface of the tail portion of the shield body and is slidable in the axial direction. It is designed to close the space between it and the formwork in which it will be placed.

Annular inner and outer packings are provided on the inner and outer peripheries of the end frame, and these packings maintain watertightness between the end frame and the formwork and between the end frame and the tail portion. This watertightness, that is, the magnitude of the contact force of the inner and outer packings against the formwork and the tail, must always be maintained at a predetermined level even if the shielding machine's digging direction changes or the packing wears. In this case, the outer packing is movable in the radial direction, and by moving the outer packing using screw means screwed in the radial direction on the end frame, the contact force of the outer packing can be changed to adjust the watertightness. It's on.

(Problem to be solved by the invention) However, in the conventional method as described above, watertightness is adjusted by moving the screw means in the radial direction. cannot be adjusted. In order to make adjustments, the end frame must be pulled out from between the tail part and the formwork by the end frame jacks to the extent that the screw means can be operated, so if water leakage occurs, it is necessary to respond quickly. I can't.

The purpose of this invention is to solve the above-mentioned conventional problems and provide a sealing device for a gable frame that can quickly adjust watertightness.

(Means for Solving the Problems) This invention to achieve the above object consists of an annular fixed pedestal provided on the rear side of the outer periphery of the end frame, and a fixed pedestal spaced apart from the fixed pedestal on the front side of the outer periphery of the end frame. The movable base is provided with an annular movable base that is movable in a direction, and an annular outer gasket that is elastically deformable and is provided between the two bases, and this outer gasket is configured to allow the movable base to be moved by a tightening means that is operated from the movable base side. It is characterized in that it is compressed between both pedestals as it moves.

(Function) When the movable pedestal is moved in the axial direction by operating the tightening means, the clamping force applied to the outer packing between the two pedestals changes. In other words, when the clamping force is increased, the outer packing elastically deforms outward in the radial direction and the contact force of the outer packing is strengthened, and when the clamping force is decreased, the outer packing is restored radially inward and the outer packing is The contact force of is weakened.

(Example) An embodiment shown in the drawings will be described below.

FIG. 1 shows a tail portion 1 of the shield body, and an annular end frame 2 is provided on the inner peripheral surface of the tail portion 1 so as to be slidable in the axial direction of the shield body. The space between the part 1 and the formwork 5 assembled inside it is closed. 4 is a gable jack, which concrete 16 is placed in a space partitioned by the tail portion 1, the formwork 5, and the gable 2.
The supply pressure of is received by this end frame jack 4.

FIG. 2 shows details of the end frame 2, in which an annular fixed pedestal 6 is formed on the rear side of the outer periphery of the end frame 2, and an annular movable pedestal 7 is provided on the front side of the outer periphery.

The movable pedestal 7 has an annular presser part 8 arranged at a distance from the fixed pedestal 6, a plurality of ribs 9 provided at appropriate intervals in the circumferential direction on the front part thereof, and a plurality of ribs 9 provided at the inner end thereof. It has an annular attachment part 10. A plurality of elongated holes 11 extending in the axial direction are formed in the mounting part 10 at appropriate intervals in the circumferential direction, and the movable pedestal 7 is moved to the end frame 2 at a desired position in the axial direction by bolts 12 inserted into the elongated holes 11. Fixed.

An outer packing 3 made of an elastically deformable material such as rubber is arranged between the pressing part 8 of the movable pedestal 7 and the fixed pedestal 6. The movable base 7 is compressed between the two bases 6 and 7 by movement of the movable base 7 by a tightening means including a bolt 13 screwed onto the fixed base 6 and a nut 14 screwed onto the base end of the bolt 13. .

Reference numeral 16 denotes an inner packing similar to the conventional one which is fixed to the inner peripheral surface of the end frame 2 by a presser plate 15, and is made of a metal plate such as stainless steel. In addition, the outer packing 3, the movable base 7, and the inner packing 16
Each member is divided into a plurality of segments in the circumferential direction.

In the sealing device as described above, for example, when the contact force of the outer packing 3 with the tail portion 1 is strengthened to improve watertightness, the following procedure is performed.

That is, the movable base 7 can be moved along the elongated hole 11 by loosening the bolt 12, and the nut 14
Tighten. As a result, the movable pedestal 7 can be moved to both pedestals 6,
7 moves to the right in FIG. 2, where the space between the outer packings 3 and 7 decreases, and this movement increases the clamping force of the outer packing 3, causing the packing 3 to elastically deform outward in the radial direction, and the contact force of the outer packing 3 increases. It will be done.

At this time, since the nut 14 is operated in the axial direction, it can be operated smoothly even when the formwork 5 is present.

(Effects of the invention) As described above, according to this invention, the clamping force of the outer packing placed between the fixed and movable bases is changed by the tightening means operated in the axial direction, thereby adjusting the watertightness. Therefore, the adjustment can be made regardless of the position of the gable with respect to the formwork, and therefore, if water leakage or the like occurs, it can be dealt with quickly.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of this invention, and FIG. 2 is a view showing the main part surrounded by line A in FIG. 1... Tail portion, 2... End frame, 3... Outer packing, 5... Formwork, 6... Fixed pedestal, 7... Movable pedestal, 13... Bolt, 14... Nut.

Claims (1)

[Claims for Utility Model Registration] 1. An annular end frame that is slidably provided on the inner peripheral surface of the tail portion of the shield body in the axial direction and closes between the tail portion and the formwork disposed inside the tail portion. The sealing device comprises: an annular fixed pedestal provided on the rear side of the outer periphery of the end frame; and an annular movable pedestal provided movably in the axial direction at a distance from the fixed pedestal on the front side of the outer periphery of the end frame. , an elastically deformable annular outer packing provided between both pedestals,
A sealing device for a gable frame in a shield machine, characterized in that the outer seal is compressed between both pedestals by movement of the movable pedestal by a tightening means operated from the movable pedestal side. 2. The sealing device according to claim 1, wherein the tightening means comprises a plurality of screw means that pass through the packing from the movable base in the axial direction and are screwed onto the fixed base.