JPS593605B2 - Anchor device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION In the present invention, an upper plate 2 and a lower plate 3 for attaching packing material are provided oppositely near the tip of a steel rod 1, and the can diameters of the upper plate 2 and lower plate 3 are Anchor hole 1 drilled inside
The upper part of the balloon-shaped packing material 4 is attached to the upper plate 2, the lower part of the packing material 4 is attached to the lower plate 3, and the upper part of the insertion cylinder 5 is inserted through the upper plate 2. At the same time, the lower part of the insertion cylinder 5 is inserted through the lower plate 3, a vibro for press-fitting cement milk is removably inserted into the insertion cylinder 5, and a fluid press-in pipe 7 is connected to the packing material 4. The present invention relates to a characteristic anchor device, and its purpose is to provide an anchor device that can easily form an anchor with excellent tensile strength.

The present invention will be explained in detail by way of examples.

In the figure, reference numeral 1 denotes a steel rod, and an upper plate 2 and a lower plate 3 for attaching packing materials are placed opposite each other with a certain gap in the vicinity of the tip.

In the figure, reference numeral 4 denotes a balloon-shaped packing material made of rubber, the upper part of which is attached to the upper plate 2, and the lower part of which is attached to the lower plate 3.

In the figure, reference numeral 5 denotes an insertion cylinder 5, which is disposed within the packing material 4, and has an upper part penetrating through the upper plate 2 and a lower part penetrating the lower plate 3. A vibro for press-fitting cement milk is inserted inside.

A fluid sealing device 8 such as a tube nipple (so-called worm) for sealing air or liquid into the packing material 4 is attached to the upper plate 2, and a fluid press fitting tube 7 is connected to this fluid sealing device 8. It is.

If the fluid sealing device 8 is a check valve such as a tube nipple, the fluid pressure fitting tube 7 can be extracted after sealing the fluid in the packing material 4.

Further, numeral 9 in the figure is a tip plate provided at the tip of the steel rod 1.

When forming an earth retaining anchor as shown in FIG. 6 using the anchor device A having the above configuration, first,
As shown in FIG. 2, after drilling an anchor hole 11 with a larger diameter than the upper plate 2, lower plate 3, and tip plate 9 in the ground using an excavator 10 such as a boring machine or auger machine, while removing the excavator 10, Cement milk 12 is poured into the anchor hole 11.

Next, as shown in FIG. 4, the anchor device A is inserted into the anchor hole 11 filled with cement milk 12 as shown in FIG. A predetermined amount of the cement milk 12 is sealed and the packing material 4 is brought into close contact with the hole wall of the anchor hole 11, and the cement milk 12 is press-fitted from a vibro for press-fitting cement milk inserted into the insertion cylinder 5.

Then, the packing material 4 comes into close contact with the hole wall of the anchor hole, so that the upward inflow of the cement milk 12 is reliably sealed, and the cement milk 12 flows into the anchor hole between the lower plate 3 and the tip plate 9. It fills up to 11.

Here, the pressure inside the packing material 4 is set to a higher pressure than the highest pressure of the injection pressure of the cement milk 12.

In this case, even if the supply pressure of the cement milk 12 is increased, the packing material 4 is not damaged by the upper plate 12 and the lower plate 3, and the sealing becomes more reliable by increasing the injection pressure.

Therefore, the cement milk 12 gradually penetrates into the hole wall, and eventually the cement milk 12 solidifies in a conical shape on the outer periphery of the hole wall as shown in FIG. 6, and the cement milk 12 inside the anchor hole 11 also solidifies. .

In this way, an anchor is formed as shown in FIG.

Here, the upper part of the packing material 4 is attached to the upper plate 2,
Since the lower part of the packing material 4 is attached to the lower plate 3, the packing material 4 will not be deformed in the direction away from the hole wall even if cement milk 12 is supplied under high pressure.

The vibro and fluid injection tube 7 are removed before the cement milk 12 solidifies.

Further, in the case of making a long anchor, the steel rods 1 are connected by welding or the like to form a long anchor.

In the figure, numeral 13 is a sheet pile for earth retaining, to which the upper end of the anchor is fixed.

In addition, when constructing an anchor for the steel tower 14, an anchor hole 11 is drilled vertically into the ground using an excavator 10, and the anchor is formed as shown in FIG. 7 using the anchor device A in the same manner as described above. do.

The anchor device of the present invention is constructed as described above, so after drilling the hole for the anchor with an excavator, the entire device is inserted into the hole for the anchor, fluid is sealed in from the fluid injection tube, and the packing material is sealed. By sealing the upper and lower parts of the upper and lower plates and press-fitting cement milk from the hollow part to allow the cement milk to permeate into the ground, a conical bulb-shaped element milk solidification part is easily formed at the base of the anchor, increasing the tensile strength. It is possible to obtain an excellent anchor, and since the packing material is balloon-shaped and has a fluid sealed inside, the internal pressure of the packing material should be set higher than the press-in pressure of the cement milk. This ensures sealing performance and allows cement to penetrate into the hole wall below the packing material, and the diameter of the upper plate and lower plate is made slightly smaller than the hole for the anchor drilled underground. The upper part of the balloon-shaped packing material is attached to the upper plate, and the lower part of the packing material is attached to the lower plate.If the packing material is kept in close contact with the hole wall, even if cement milk is supplied at high pressure. This has the advantage that not only does the packing material not deform in the direction away from the hole wall, but also the packing material is not damaged, and a more reliable seal is achieved. It does not bulge upward or downward beyond the lower plate, and there is a small gap between the outer edge of the upper plate, the outer edge of the lower plate, and the inner wall of the anchor hole. Even if there is a sharp stone mixed into the balloon, there is no risk of the balloon-shaped packing material being torn by the sharp stone and the fluid pressurized inside leaking out.

In addition, the upper part of the insertion cylinder is inserted through the upper plate, and the lower part of the insertion cylinder is installed through the lower plate, and the pipe for press-fitting cement milk can be freely inserted into the insertion cylinder, so that the cement milk can be inserted into the insertion cylinder freely. After press-fitting, the pipe for press-fitting cement milk can be taken out and reused by pulling it out from the insertion cylinder before the cement milk hardens, and the insertion cylinder penetrates the upper plate and the lower plate. Therefore, even if the pipe can be removed freely, the fluid sealed in the balloon-shaped packing material will not leak, and the sealing effect of the packing material will not deteriorate. There is no need to provide a hollow hole, so even if a long anchor is required, it can be easily made into an anchor with a large tensile force by simply connecting the steel bar to another steel bar. It has the advantage that it is easier to connect than welded pipes, and it can be expected to have greater tensile force at the joint than steel pipes.

[Brief Description of the Drawings] Fig. 1 is a partially cutaway sectional view showing one embodiment of the anchor device of the present invention, and Figs. 2 to 6 show the steps of constructing an anchor using the same anchor device. FIG. 7 is a partially cutaway sectional view showing an example of construction of the same pond, in which 1 is a steel rod, 2 is an upper plate, 3 is a lower plate, 4 is a packing material, 5 is an insertion cylinder, 6 is a pipe, and 7 is a fluid injection tube.

Claims (1)

[Claims] 1. Install an upper plate and a lower plate for attaching packing material oppositely near the tip of the steel rod, make the can diameter of the upper plate and lower plate slightly smaller than the anchor hole to be drilled into the ground, and attaching the upper part of the balloon-shaped packing material to the lower plate, and attaching the lower part of the packing material to the lower plate, passing the upper part of the insertion cylinder through the lower plate, and penetrating the lower part of the insertion cylinder into the lower plate; An anchor device characterized in that a pipe for press-fitting cement milk is removably inserted into an insertion cylinder, and a fluid press-fitting pipe is connected to a packing material.