JPH0226018B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a retaining device used, for example, in construction work for burying gas pipes.

[Conventional technology]

Currently, for example, when burying gas pipes, etc., workers enter the trench to weld the joints of the gas pipes. The trench is excavated wider than the other parts. This working area is called the kaisho.

[Problem that the invention seeks to solve]

However, there is a tendency for such welding work to be automated, and with this automation, there has been a desire to eliminate the above-mentioned cut-off area and to perform automatic welding within the normal width of the excavated groove. For this reason, in connection with civil engineering work incidental to this type of automatic welding, it is necessary to use a simple method that can secure the space necessary for automatic welding and protect automatic welding equipment by simple operation from the ground. It was necessary to develop a suitable mountain retaining device.

An object of the present invention is to easily set and remove a swing arm as a tension beam between retaining plates on one side and the other side in an excavated trench by simple operation from the ground. Our goal is to provide a mountain retaining device that can.

[Means for solving problems]

The present invention provides a retaining device in which a retaining plate 3 on one side and a retaining plate 4 on the other side are installed facing each other at a constant interval by a plurality of rotating arms 5.
The base end 9 of the swing arm 5 is attached so as to be horizontally movable and rotatable, and the cam body 10 is fitted inside the base end 9 of the swing arm 5 so as to be rotatable and vertically movable. A cam shaft 11 is integrally provided at an eccentric position of this cam body 10 to engage with operating rods 12 and 13 inserted from above, and a cam shaft 11 is provided inside the base end of the swing arm 5 and between the cam body 10. 10 is provided with engagement parts 20 and 21 which can be freely engaged and detached by vertical movement of the holder 10, and the tip part 29 of the swing arm 5 is detachably connected to the holder plate 4 on the other side.

[Effect]

In the present invention, the cam body 10 is moved in the axial direction by the operating rods 12 and 13, and both the engaging portions 20,
21 is engaged and rotated, the pivot arm 5 rotates and can be attached to and detached from the retaining plate 4 on the other side. Further, when the engaging portions 20 and 21 are disengaged and the cam body 10 is rotated, the eccentricity of the cam body 10 causes the swing arm 5 to move forward and backward in the axial direction, and the pivot arm 5 moves back and forth in the axial direction. The tension between the plates 3 and 4 is then released.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to embodiments shown in the drawings.

As shown in FIG. 1, for example, in the construction work for burying a gas pipe 1, one retaining board 3 is formed of aluminum or the like on an earthen wall facing an excavated trench corresponding to the joint part 2 of this gas pipe, and the other The side retaining plates 4 are installed opposite each other at a constant interval by the four left and right swing arms 5.

As shown in FIG. 2, this swing arm 5 is installed by fixing arm supports 7 to the upper and lower parts of the reinforcing ribs 6 that constitute a part of the retaining plate 3 on one side, and the arm supports 7 are shaped like a U-shape. The base end 9 of the swing arm 5 is attached to the inner space 8 so as to be horizontally movable and rotatable. The base end 9 of the swing arm 5 is formed into a cylindrical shape, and a cam body 10 is installed inside the base end 9.
A cam shaft 11 is integrally provided at an eccentric position of the cam body 10.
This camshaft 11 has an engaging protrusion 14 and an engaging recess 15 of operating rods 12 and 13 inserted from above.
The engagement groove 16 and the engagement pin 1 that engage with the
7, and this camshaft 11 is slidably supported by flanged bearings 18 fitted to the upper and lower plate portions of the arm support 7. The lower flange bearing 18 holds a coil spring 19 fitted to the camshaft 11 on the lower surface of the cam body 10, and the coil spring 19 pushes the cam body 10 up to the position shown in the figure. In addition, the above-mentioned rotating arm 5
Engagement portions 20 and 21 are provided on the inner circumferential surface of the base end portion 9 and the outer circumferential surface of the cam body 10, respectively, which can be freely engaged and disengaged by vertical movement of the cam body 10. Therefore, the engaging portions 20, 21 are removed. Further, the rotating arm 5 has a right-hand thread 24 and a left-hand thread 2 at both end threaded portions 23 of the pipe member 22.
5 are screwed together, and these are fixed with a nut 26 in the form of a turnbuckle, and the length of the arm can be expanded and contracted. Further, an arm receiver 28 is fixed to the upper and lower parts of the reinforcing rib 27 that constitutes a part of the retaining plate 4 on the other side, and the tip 29 of the swing arm 5 is removably fitted to the arm receiver 28. A pin 30 is inserted into these to connect them.

As shown in FIG. 3, the engaging portion 20 provided on the inner circumferential surface of the base end portion 9 of the swing arm 5 is a groove provided between a pair of arc-shaped convex portions 31, and the cam body 1
The engaging portion 21 provided at 0 is formed by a pin.

Further, as shown in FIG. 4, the arm receiver 28 is provided with a locking plate 32 on one side and has an opening on the opposite side.
The distal end portion 29 of the swing arm 5 is fitted and removed through the steps. In addition, this arm receiver 28 has elongated holes 3 in the upper and lower plate parts.
4, and the pin 30 is inserted into this elongated hole 34.
to loosely fit. As shown in FIG. 5, the pins 30 are welded to the upper and lower parts of one bar 35, so that the upper and lower pins 30 are inserted at the same time.

Then, when setting up this device, install the retaining plates 3 on one side and the other side along the opposing walls in the excavated trench.
4, insert and engage the operating rods 12 and 13 into the camshafts 11 at the top and bottom of one side of the retaining plate 3, respectively, and hold the handles 36 provided on the tops of these rods 12 and 13. By pressing down the rods 12 and 13 against the spring 19, the engaging portion 21 of the cam body 10 and the engaging portion 20 of the swing arm 5 are engaged, and the rods 12 and 13 in this depressed state are The pivot arm 5 is pivoted around the camshaft 11 by rotating each of the pivot arms 5 and 5, and the distal end 29 of the pivot arm 5 is fitted into the arm receiver 28 of the retaining plate 4 on the other side. pin 3
0 are inserted into these at the same time and fixed. Next, the pressing force of the rods 12 and 13 is released, and the engaging portion 2
0 and 21 are released by the spring 19,
When the rods 12 and 13 are rotated, only the cam body 10 rotates eccentrically, and the cam body 10 slides inside the base end 9 of the rotary arm 5 and moves the rotary arm 5, which is not rotatable. Move in the axial direction to the side of the mountain retaining plate 4 on the other side, and extend the mountain retaining plate 4 on the other side against the mountain retaining plate 3 on one side by the swing arm 5, and move both mountain retaining plates 3 and 4 to the earth wall surface. Crimp. The maximum amount of movement of the swing arm 5 in the axial direction is 2 times the amount of eccentricity of the cam body 10.
It's double. After setting the upper and lower swing arms 5 on one side in this way, pull out the operating rods 12 and 13 upward from the upper and lower camshafts 11 on one side, and insert and engage the rods 12 and 13 into the upper and lower camshafts on the other side. Then, the upper and lower rotating arms on the other side are similarly rotated and extended, and the operating rods 12 and 13 are pulled out to complete preparations before starting work.

Next, after completing the work using an automatic welding machine or the like between the retaining plates 3 and 4 on both sides, the rods 12 and 13 inserted and engaged with the camshaft 11 are rotated without being pushed down, and the swivel arm 5 is is moved in the axial direction toward the retaining plate 3 on one side, the tension of the swing arm 5 is released, the pin 30 is pulled out, and the engaging parts 20 and 21 are engaged by pushing down the rods 12 and 13. Then, by rotating the rods 12 and 13, the swing arm 5 is moved to the arm receiver 2 of the retaining plate 4 on the other side.
8 in the direction to remove it and separate it, and take out the retaining plates 3 and 4 on both sides from the excavated grooves.

It goes without saying that the use of the tether device of the present invention is not limited to automatic welding, but can also be used for other types of tethers.

〔Effect of the invention〕

According to the present invention, the vertical movement of the cam body is provided in the inside of the base end portion of the swing arm that is horizontally movable and rotatably attached to the retaining plate on one side, and the cam body fitted in this inside. Since each engagement part is provided with a removable engagement part, the tip of the swing arm can be attached to the retaining plate on the other side by engaging both engagement parts with the operating rod and rotating. The cam body can be rotated toward the cam body or removed from the retaining plate on the other side, and since the cam shaft that engages with the operating rod is integrally provided at an eccentric position of the cam body, only the cam body can be rotated by the operating rod. By rotating the swivel arm, which is unable to rotate due to engagement with the retaining plate on the other side, is moved in the axial direction of this rotating arm. These can be crimped to the soil wall surface by applying tension, and after the work is completed, the tension can be released and the connection of the swing arm can be easily disconnected before removing the swing arm from the retaining plate on the other side. . Furthermore, the operation of attaching and detaching the swing arm can be easily performed from the ground by means of an operating rod that engages with the camshaft.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing one embodiment of the retaining device of the present invention, Fig. 2 is a cross-sectional view of its essential parts, Fig. 3 is a plan view of its rotating arm, and Fig. 4 is a perspective view of its arm receiver. FIG. 5 is a front view of the pin fixing the pivot arm. 3, 4...Mountain plate, 5...Swivel arm, 9...
Base end of rotating arm, 10... cam body, 11...
Camshaft, 12, 13...Operating rod, 20, 21
. . . Engaging portion, 29 . . . Tip portion of the swing arm.

Claims (1)

[Claims] 1. In a retaining device in which a retaining plate on one side and a retaining plate on the other side are installed facing each other at a fixed interval using a plurality of rotating arms, the proximal end of the rotating arm is attached to the retaining plate on one side. An operation in which a cam body is mounted so as to be movable and rotatable in the horizontal direction, and a cam body is fitted inside the base end of this swing arm so as to be movable vertically and freely, and the cam body is inserted into the eccentric position of the cam body from above. A cam shaft that engages with the rod is integrally provided, and engaging portions that can be freely engaged and disengaged by vertical movement of the cam body are provided inside the base end of the swing arm and the cam body, and the other side A retaining device characterized in that the tip of the swing arm is detachably connected to the retaining plate.