JPH0314303Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is a pipe connecting device that enables pipe connections to be made from the ground outside an excavated trench in the installation work of underground communication cable pipes. This invention relates to a tube gripper.

(Prior art) A conventional pipe connecting device with a plug-in type joint is mainly used for connecting upper and lower pipes.
In this example, as shown in FIG. 6, a wire or chain 3 is wound around each of the pipes 1 and 2 to be connected to each other.
A holder 4 is attached to each of the wires or chains 3 on both sides, and these holders 4 are pulled together by a wire tensioner 5. In the second example, a lever 6 is attached as shown in FIG. By pressing down, the arm 7 is closed, the tube is gripped by a rubber-lined tube gripper 8, and the wire 9 is pulled by a ratchet type puller 10 to connect the tube. In the third example, as shown in FIG.
After wrapping the chain 13 around the spigot and fixing it,
A flange 16 fixed to the tip of a piston rod 15 of a hydraulic jack 14 provided on the main body 11 of the device is engaged with the chain 13, and by contracting the jack 14, the pipe 2 on the insertion side is pulled in and the pipe connection is performed. be.

(Problems to be solved by the invention) With the conventional connecting device as described above, a worker must attach it to the pipe near the pipe and operate it. I went in and started making connections. As a result, there is a high risk of personal injury due to collapse of the earthworks, etc., and there is a desire for a connection device that can perform connection work without the need for workers to enter the excavated trench, but there is currently no such device.
The main reason for this is the gripping device; conventional grippers cannot grip the pipe on the ground outside the trench.

In view of the above-mentioned points, the present invention provides a tube gripping device of a tube connecting device that allows tube gripping for connecting tubes to be performed from the ground.

(Structure of the invention) Fig. 1 is a schematic diagram of an embodiment of the invention in use when connecting pipes, Figs. 2 to 4 show the gripping portion of the gripper 21b on one side, and Fig. 5 shows the gripping portion on the other side. Part 2
1a shows the grip part, 30 is a long rod, 31 is a tube abutment provided at the lower end of the rod 30, and 32 is an upper and lower 2
It is a stretchable body in which four sets of double strips 35 are combined in a pantograph shape, and the crossing portions of two sets of double strips 35 are joined by a rod 30 and extended to the other side. Arms 34 each having a side gripper 33 attached to its extended end are supported by articulation. As shown in FIG. 4, the lower end of the side gripper 33 is bent into an arc shape so as to spread outward so that it can be easily fitted into a tube. The other three intersections of the strip 35 are joined by pins 36, 37, and 38.
Further, another short strip 39 is connected to the pin 36, and this short strip 39 is provided with a roller 40 that can roll on the tube surface in order to smoothly exert the tube clamping force by the gripper. In the gripper 21a, the mounting piece 4
5, the base end side of the hydraulic jack 24 is connected with a pin 25, and the second
As shown in FIGS. 3 and 3, a hook 27 is provided as a hydraulic jack mounting piece into which a ring portion 26 at the tip of the hydraulic jack 24 is fitted. 41 is pin 3
It is a spring that is stretched between 7 and 38 and always tries to contract, and acts to reduce the distance between the side grippers 33 and 33 on both sides. 42, when the tube is not gripped, the side grippers 3 on both sides are moved by the force of the spring 41.
This is a stop to maintain an appropriate distance so that the distance between 3 and 33 does not become too narrow.

Therefore, when gripping a pipe with the gripper of the present invention and making a connection, the grippers 21a, 21b and their rods 3
0 and push it so that the tubes 43, 44 are inserted between the side grippers 33, 33 on the opposite side from the ground, the side grippers 33, 33 will push the tube 4 from the widened part at the bottom.
3, 44, the distance between the side grippers 33, 33 on both sides widens a little against the force of the spring 41, and the tube 4
Fits in 3,44. Once fitted, the force of the spring 41 will lightly grip the tube. Next, on the ground, the tip L of the operating rod 28
Fit the bent part into the ring part 29 at the tip of the hydraulic jack 24 held in a holder (not shown) provided on the gripper 21a, remove it from the holder, and fold it down, and remove the ring part 26 at the tip. It is fitted and locked into the hook 27 of the gripper 21b. Next, the hydraulic jack 24 is retracted by operating the power source installed on the ground.
At that time, due to the force of the hydraulic jack 24, the extensible body 32 tries to extend in the tube axis direction, and both grippers 2
Try to reduce the distance between the side grippers 33, 33 on both sides of 1a, 21b, grip the tubes 43, 44 with strong force, and at the same time, in this state, the tube 44 will be drawn toward the tube 43, and both tubes will be Connected. If the pipe to be connected requires a large insertion force, such as a steel pipe, firmly grip the pipe with a large force corresponding to the insertion force required. In addition, in the case of a weak material such as a resin pipe that requires a small insertion force, the pipe is gripped with a corresponding force that is not very strong, and the pipe of low strength is not crushed and crushed.

Note that in the embodiment described above, the gripper 21a
The hydraulic jack 24 is connected and supported, but the hydraulic jack 24 is separated from the gripper 21a,
This hydraulic jack 224 is attached to the lower end of the long rod, the gripper 21a side is provided with a hook similar to the gripper 21b, and the base end side of the hydraulic jack 24 is also provided with a ring portion that fits into the hook. 24 may be attached to both grippers from the ground using rods. Further, the remote-controlled pipe puller is not limited to a hydraulic jack, but may be one that operates electrically.

(Effects of the invention) As described above, according to the invention, the pipe to be connected can be inserted into the pipe from the ground outside the excavation trench, and easily gripped by the force of the spring, and the pipe can be pulled by the remote-controlled pipe puller that is attached. The extensible body can be pulled to strongly grip the tube, and at this time, it generates a gripping force that corresponds to the insertion force of the tube, so if the tube requires a strong insertion force, it can be gripped strongly to connect the tube, and the insertion force can be reduced. Since a pipe with a small strength is gripped with a corresponding force, it is possible to grip and connect the pipe without damaging the pipe.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of the embodiment of the present invention in use, FIG. 2 is a plan view of the gripping part of one of the grippers of the present invention, FIG. 3 is a side view of the same, and FIG. 4 is a front view of the same.
FIG. 5 is a plan view of the gripping part of the other gripper, FIG. 6 is a side view of an example of a conventional pipe connecting device, FIG. 7 is a perspective view of another example of a conventional pipe connecting device, and FIG. 8 1 shows still another example of a conventional pipe connecting device, in which FIG. 1A is a plan view, FIG. 2B is a side view, and FIG. 21a, 21b...Gripper, 24...Tube puller, 27, 45...Tube puller attachment piece, 30
... Rod, 32 ... Expandable body, 33 ... Side gripper, 34 ... Arm, 35 ... Band-like piece, 36,3
7, 38...pin, 39...another strip, 41...
...Spring.

Claims (1)

[Scope of utility model registration request] A stretchable body is provided at the bottom of a long rod, in which four sets of strips are combined in a pandagraph shape, one of which intersects with the rod, and the other three intersects are connected with pins. Two sets of strips of the strips that are joined to each other at the rod joint portion of the extensible body are connected with arms each having a side gripper that moves in a direction perpendicular to the axial direction of the rod. A spring is attached between the pins on both sides adjacent to the rod joint, and the four pairs are connected to the pins of the pin joint facing the rod joint. A tube gripping device characterized in that a mounting portion for a remote-controlled tube puller is provided on a strip separate from the strip.