JPH0458252B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention comprises a stationary rod that can be made substantially horizontally, and a movable pipe that is slidably fitted into the stationary rod. The airtight stopper is fitted with a ring-shaped elastic stopper that expands its outer diameter under pressure and comes into airtight contact with the inner surface of the underground pipe, and is suspended inside the handhole to prevent people from entering the manhole. When fitting the elastic stopper into the spring, it is fixed so that the immovable rod does not rotate, making it easy to fit the elastic stopper.

(Prior Art) Conventional underground conduits for carrying telephone lines, etc., open at both ends into adjacent manholes, and water is poured into the long inner space between the adjacent manholes of the underground conduit. To test for leaks, an airtight plug is installed at one end of the pipe, and high-pressure gas is sent from the center of the airtight plug at the other end to ensure there is no air leakage that could cause water leaks. I was testing whether or not. However, for example, in facilities where telephone lines are passed through underground conduits, the inner diameter of the conduits has become smaller and the number of such conduits has decreased with technological innovation.
Traditional manholes have been converted to handholes, making it impossible for people to enter. For this reason, it has become difficult or impossible to use the airtight equipment that had traditionally been operated by a person entering the manhole.

(Problems to be Solved by the Present Invention) The present invention provides a method for suspending equipment from the upper opening of a handhole that cannot be accessed by a person, and when sealing the equipment, a fixed rod or the like rotates around the hanging member. However, the objective is to develop a device that can fix the angle so as not to cause the rotation described above, which makes it difficult to insert the elastic stopper into an underground pipeline.

(Means for Solving the Problems) The present invention aims to solve the problems mentioned in the previous section, and includes a fixed rod that can be made substantially horizontal, and a fixed rod that is slidably fitted into the fixed rod. A ring-shaped elastic plug is fitted between a fixed rod and each end of the movable pipe to expand its outer diameter by pressure and come into airtight contact with the inner surface of the underground conduit. A cannula is attached almost vertically to a fixed rod protruding from the rear end, an operating shaft is protruded upward from the lid of the cannula, and a feed screw, which controls the reciprocating movement of the movable pipe by rotation, is loosely installed inside the cannula. At the same time, a rotation stopper is provided on the lower surface of the lid portion of the cannula, and an engaging member is provided on the feed screw that normally comes off below the rotation stop and engages with the rotation stop when lifted, and the operating shaft of the feed screw is When a fixed rod or the like is suspended by gripping it on the mantle, the engaging member is engaged with a rotation stopper to restrain the angle of the fixed rod or the like from rotating so that the rotation does not occur. This relates to an airtight plug device for underground pipelines.

(Function) The present invention is equipped with a stationary rod that can be made almost horizontally, and a movable pipe that is slidably fitted into the stationary rod. This airtight plug has the same structure as the conventional one, with a ring-shaped elastic stopper fitted into the inner surface of the attached conduit in airtight contact, but while using this structure, a fixed rod protruding from the rear end of the movable pipe has been installed. The cannula is installed almost vertically, the operating shaft protrudes upward from the lid of the cannula, and a feed screw that controls the reciprocating movement of the movable pipe by rotation is gently inserted into the cannula. A rotation stopper is provided on the lower surface of the lid, and an engaging member is provided on the feed screw that normally comes off below the rotation stopper and engages with the rotation stopper when lifted. When hanging, the engaging member engages with the rotation stopper to restrain the rotation of the fixed rod etc. and fix it at a certain angle.The operating shaft is used to hold the fixed rod horizontally and hang it from the ground. , the immovable rod and the cannula etc. are lowered by their own weight, and the engaging member of the feed screw is engaged with the rotation stopper on the lower surface of the lid of the cannula, which causes the immovable rod etc. to rotate around the operating shaft. It is fixed at an almost horizontal angle so that horizontal rotation is not possible, and in this fixed state, the elastic plug is inserted into the underground conduit exposed on the wall of the hand hole.

(Embodiment) The accompanying drawings show an embodiment of the present invention, in which reference numeral 1 is a hand hole into which no one can enter, and the end of an underground conduit 2 is exposed on the wall of the hand hole 1.

Reference numeral 3 is a fixed rod consisting of a pipe with a hose connection port 4 for supplying pressurized air at the rear end (left end in Figure 2) so that it can be parallel to the axis of the pipe line 2 when hanging. Yes, and a collar 5 is provided at the tip. (When the hose connection port is not needed, it is closed.) 7 is a movable pipe that is slidably fitted to the immovable rod 3, and a ring plate 8 corresponding to the rear of the collar 5 is engaged at the front end, Bracket 9 with a U-shaped cross section at the rear end
is fixed, and a slider pin 10 is attached above the fixed rod 3 to cross the rod.

The immovable rod 3 is provided with a screw 6 at the rear part protruding from the movable pipe 7, and a nut 11 is screwed onto the screw 6, which is fixed by a push screw 12. A sleeve tube 13 that is substantially perpendicular to the sleeve tube 13 is fixed, and an axial slit 14 is formed on the front side of the sleeve tube 13. Lid member 1 of cannula 13
A concave arc-shaped rotation stopper 16 is provided on the lower surface of the rotor 5 in the radial direction. A feed screw 17 provided with a hexagonal operator 18 protruding upward from the center of the lid member 15 is loosely passed through the inside of the cannula 13, and the feed screw 17 is inserted into the bottom of the cannula 13 as shown in FIG. A pin-shaped engaging member 19 is provided, which comes off below the rotation stop 16 in the normal state in contact with the rotation stop 16, and comes into contact with and engages the rotation stop 15 as shown in FIG. 5 when the feed screw 17 is lifted. A radial through hole 20 is provided in the radial direction. A nut 21 is screwed onto the feed screw 17 inside the sleeve tube 13, and a slider 22 which is passed through the slit 14 to prevent rotation is attached to the nut 21, or
Provided integrally with

23 is a slope 2 from the rear lower surface of the slider pin 10
As shown in FIG. 3, the cam plate is a cam plate which is engaged with the cam plate 4 and protrudes from both sides of the immovable rod 3, and its upper end is supported by a shaft 25 provided on the slider 22.

Ring-shaped elastic plugs 26, 26 made of rubber are provided between the collar 5 of the immovable rod 3 and the ring plate 8 which engages with the tip of the movable pipe 7, by being fitted onto the immovable rod 3 as is known in the art.

In this embodiment, an operating shaft 31 of an appropriate length is fitted into the operating element 18 of the feed screw 17 and fixed with a pin member 32 passed through the through hole 20, and when the operating shaft 31 is suspended on the ground, the fixed rod 3, Movable pipe 7, feed screw 1
7 etc. is lifted against its own weight, and the engaging member 19 is also lifted at the same time, so engage this member 19 with the rotation stopper 16 of the lid member 14 from below as shown in Fig. 5 (if there is no shock, Adjustment is made by slightly lowering the feed screw 17 together with the operating shaft 31 via the operating shaft 31). After the engagement is established as described above, suspend the fixed rod 3, cannula 13, etc. into the hand hole 1 using the operating shaft 31, and direct the elastic plugs 26, 26 toward the underground pipe 2 as shown in Fig. 1. Insert as shown in Figure 2.

After the fitting is completed, lower the operating shaft 31 a little so that the feed screw 17 touches the bottom of the cannula 13, and as shown in FIG.
The slider 22 is moved upward together with the nut 21 by rotating the operating shaft 31 and the feed screw 17 using the handlebar 33, and the slope 24 of the cam plate 23 moves the slider pin 10 and the movable pipe 7.
is pressed, thereby compressing the elastic plugs 26, 26 as shown in FIG. 6 to expand their outer diameters, thereby providing an airtight plug to the underground pipeline.

(Effects) The present invention attaches the mantle 13 to the immovable rod 3 at a substantially right angle, loosely inserts the feed screw 17 that can move up and down a little inside the mantle 13, and closes the lid member 14 of the mantle 13. A rotation stopper 16 is provided on the lower surface, and an engaging member 19 is provided on the feed screw 17, which comes off below the rotation stop 16 in a normal state and engages with the rotation stop 16 when the feed screw 17 is lifted, When the feed screw 17 is suspended by the operation shaft 31 provided on the protruding portion of the feed screw 17 at the upper part of the sleeve tube 13, the engaging member 19 engages with the rotation stopper 16 and engages with the feed screw 16 to prevent rotation. The immovable rod 3, the movable pipe 7, and the mantle 13, which not only stop but also have a large self-weight,
Since the rotation of the elastic stopper 26 is stopped and the operating shaft 31 of the elastic plug 26 is held constant with respect to the operating shaft 31, the operating shaft 3
1 has the effect of simplifying the operation of suspending the elastic plug in the hand hole 1 and fitting it into the underground conduit 2 without causing horizontal swinging and at a distance.

[Brief explanation of drawings]

The attached drawings show an embodiment of the present invention, and FIG. 1 is a side view showing the hand hole 1, FIG. 2 is a vertical sectional view, FIG. 3 is a partial perspective view, and FIGS. FIG. 6 is a longitudinal sectional front view of the main part of the present invention, and a vertical sectional view of the sun pressing the elastic plug. 3->immovable rod, 7->movable pipe, 9->bracket, 13-> sleeve, 15->lid member, 16->rotation stopper, 19->engaging member, 26->elastic stopper, 31->rotating shaft.

Claims (1)

[Scope of Claims] 1. A stationary rod that can be made almost horizontally, and a movable pipe that is slidably fitted into the stationary rod, and the outside diameter is expanded by compression between the ends of the stationary rod and the movable pipe, and the pipe is expanded underground. In an airtight stopper fitted with a ring-shaped elastic stopper that makes airtight contact with the inner surface of the conduit, the mantle is attached almost vertically to the immovable rod that protrudes from the rear end of the movable pipe, and the operating shaft is inserted from the lid of the mantle. A feed screw that protrudes from the upper surface and controls the reciprocating movement of the movable pipe by rotation is gently inserted into the cannula, and a rotation stopper is provided on the lower surface of the lid of the cannula, and the feed screw usually has a rotation stopper. An engaging member is provided which is detached from below and engages with the rotation stop when lifted, and when the operating shaft of the feed screw is grasped and a stationary rod, etc. is suspended, the engagement member is engaged with the rotation stop and the stationary rod, etc. 1. An airtight plug device for an underground conduit, characterized in that the rotation of the pipe is restrained to prevent the rotation from occurring.