JPS586014B2 - Tension confirmation device such as rod - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to rods, etc., including earth anchors in mountain restraining work and rock bolts in the Natome method, and more specifically, to monitor the tension of rods, etc. that support the earth and structures under tension. This relates to a tension checking device such as an od.

Construction methods such as the Earth Anchor and Natom construction methods use a grouting method to solidify rods or wire ropes inserted into the ground, and use this as a reaction force to maintain lateral pressure on structures such as underground walls and tunnel walls. This method is widely used due to its economic efficiency and workability, but since the reaction force is located in the ground, it is difficult to confirm that tension is effectively acting on the rod, etc. be.

By measuring the tension applied to the rod, its safety can be controlled, but since the number of rods used is large, it is economically difficult to use expensive tension rods.

By inserting a simple additional device into the binding part of the rod, the present invention makes it possible to display to the constructor the decrease in tension of the rod due to insufficient reaction force of the underground wall, thereby improving construction safety and work efficiency. This is intended to help improve the quality of life.

This invention involves inserting a rod or the like into a support such as an underground wall, applying tension to the rod or the like to hold the support, and transmitting the tension of the rod or the like to the support via an elastic device. This is also a tension checking device, such as a rod, in which a display plate, which is always urged outward, is interposed between the elastic device and the support.

The embodiment shown in the attached drawings will be explained below. Reference numeral 1 is a rod fixed to the head of a rod or wire rope having an anchor plate (not shown) at the lower end, and is attached to a support such as an underground wall using a grouting method or the like. 2, and has a threaded portion 3 at the upper end.

A large washer 4 has a plurality of radial grooves 5 on its surface.

6 is a nut that is screwed into threaded portion 3 of rod 1;
By tightening the rod 1, tension is applied to the rod 1.

Reference numeral 7 denotes an elastic device, which is bent by tightening the nut 6, and clamps the display plate 8 between the elastic device 7 and the dog washer 4.

The display plate 8 is always urged outward by a spring 9 provided in the groove 5 of the dog washer 4, and is connected to the elastic device 7 by a thread 10 or the like.

11 is a small washer interposed between the nut 6 and the elastic device 7.

In use, after burying the rod 1 in the ground, attach the parts in the order of the dog washer 4, elastic device 7, small washer 11, and nut 6, take the reaction force to the rod 2, and remove the small washer using a jack (not shown) or the like. Insert the display board 8 while pressing 11,
When the display board 8 is further pressed with a jack until it does not pop out, the elastic device 7 is bent by the initial tension of the rod 1, and the display board 8 is sandwiched between the dog washer 4 and the elastic device 7 and fixed. It will be in the set state as shown in the figure.

Next, in Figure 2, the tension of rod 1 decreases (starting to come off, etc.)
When this occurs, the elastic device I floats up according to the elastic coefficient of the elastic device 7, and the force restraining the display board 8 with the dog washer 4 weakens, and the display board 8 is set in the groove 5 of the dog washer 4. The display board 8 pops out to the periphery within the length of the thread 10 due to the repulsive force of the spring 9.

By applying surface treatment to the display board 8 for good visibility, a construction manager or the like can quickly confirm a decrease in the tension of the rod 1 and take countermeasures.

By arranging the display plates 8 radially around the rods 1 as shown in FIG. 3, even if the tension of the rods 1 acts on the elastic device 7 in an eccentric direction, any of the display plates 8 can pop out.

In addition, if the rod is fixed diagonally, such as the tension rod in the earth anchor construction method, it is also possible to make it fall by the weight of the display board 8 or by attaching a weight to the display board 8 without using the spring 9. can.

Furthermore, by connecting the display plate 8 to the elastic device 7 with a thread 10, the display plate can be operated in any direction in which the head of the rod 1 is installed, up, down, left or right.

[Brief explanation of the drawing]

1 is a diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing the operating state of FIG. 1, and FIG. 3 is a 1-1 line diagram of FIG. 1. 1...0 rod, 2...support, 7...elastic device,
8...Display board, 9...Spring.

Claims (1)

[Claims] 1. In a rod or wire that is inserted into a support such as an underground wall, and tension is applied to the rod to protect the support, the tension of the rod or the like is transmitted to the support via an elastic device. A tension checking device, such as a rod, in which a display plate, which is always urged outward, is interposed between the elastic device and the support.