JPS593604B2 - anchor couch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an injection port 3 at the tip of a steel material 2 having a hollow portion 1 for press-fitting cement milk, and an anchor hole 10 drilled into the ground at the tip of the steel material 2. The tip plate 4 having a diameter slightly smaller than the diameter is fixed and the tip plate 4 is
An upper plate 5 having a diameter slightly smaller than the diameter of the anchor hole 10 drilled in the ground is fixed to the front side of 0, a balloon-shaped packing material 6 is attached to the lower surface of the upper plate 5, and a fluid is applied to the packing material 6. The present invention relates to an anchor device characterized by connecting press-fit tubes 1, 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 below with reference to Examples.

As shown in FIG. 1, the anchor device A has an injection port 3 at the tip of a steel material 2 having a hollow section 1 for press-fitting cement milk, fixes a tip plate 4 to the tip of the steel material 2, and fixes a tip plate 4 in front of the tip plate 40. It is generally constructed by fixing an upper plate 5 to the side.

A balloon-shaped packing material 6 made of rubber is installed on the lower surface side of the upper plate 5.
A fluid sealing column 8 such as a tube nipple (so-called "mushi") for sealing fluid such as air or liquid in the packing material 6 is attached to the fluid sealing column 8.
is concatenated.

If the fluid sealing column 8 is a check valve such as a tube nipple, the fluid press tube 7 can be extracted after sealing fluid such as air or liquid into the packing material 4.

When forming an earth retaining anchor as shown in FIG. 6 using the anchor device A configured as described above, first, as shown in FIG. 2, an excavator 9 such as a boring machine or an auger machine is An anchor hole 10 having a larger diameter than the tip plate 4 and the upper plate 5 is bored in the ground, and after drilling, cement milk 11 is poured into the anchor hole 10 while removing the excavator 9.

Here, the diameter of the anchor hole 10 is such that when the anchor device A is inserted into the anchor hole 10, there is a small gap between the outer end of the upper plate 5 and the inner wall of the anchor hole 10, as shown in FIG. The diameter of the anchor hole 10 is made slightly larger than the diameter of the upper plate 5 so that.

Next, as shown in FIG. 4, the anchor device A is inserted into the anchor hole 10 filled with cement milk 11 as shown in FIG. At the same time, cement milk 11 is press-fitted from the hollow part 1.

Then, the packing material 6 comes into close contact with the hole wall of the anchor hole 10, and the upward inflow of the cement milk 11 is reliably sealed, and the cement milk 11 flows into the anchor hole 10 between the tip plate 4 and the upper plate 5. filled with.

In this case, as shown in FIG. 5, the pressure of the cement milk 11 and the air or liquid inside the packing material 6 are maintained at the same pressure, but the supply pressure of the cement milk from the hollow part 1 and the pressure of the anchor hole 1 are maintained at the same pressure.
When the pressure of the cement milk 11 in the container 0 reaches the same pressure, the packing material 6 no longer shrinks and deforms.

Therefore, the cement milk 11 gradually penetrates into the hole wall of the anchor hole 10 at a predetermined pressure, and eventually, as shown in FIG. The cement milk 11 inside also solidifies.

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

Here, 12 in the figure is a sheet pile for earth retaining, to which the upper end of the anchor is fixed.

When constructing an anchor for the steel tower 13, an anchor hole 10 is drilled vertically into the ground using an excavator 9, and the anchor is formed as shown in FIG. 7 using the anchor device A in the same manner as described above. .

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 plate and press-fitting cement milk from the hollow part to allow the cement milk to permeate into the ground, it is easy to create a conical bulb-shaped cement milk solidification part with the tip plate as the core material at the base of the anchor. An anchor with excellent tensile strength can be obtained by forming an anchor hole with a diameter slightly smaller than the diameter of the anchor hole drilled in the ground. Since the upper plate with a packing material of the same diameter is fixed, when inserting the anchor device into the anchor hole, the tip plate and upper plate, which are slightly smaller than the anchor hole, act as guides when inserting the anchor device. The packing material is not sometimes rubbed against the inner wall of the anchor hole, and the packing material is not worn or torn when the anchor device is inserted.

Moreover, the packing material attached to the upper plate is balloon-shaped and has a fluid sealed inside, so the press-in pressure of the cement milk and the internal pressure of the packing material are always constant, and the cement milk is press-fitted with high pressure. The more the sealing material is used, the more reliable the sealing performance will be with the packing material, and since the diameter of the upper plate is slightly smaller than the diameter of the hole for the anchor drilled in the ground, the balloon-shaped packing material will not exceed the outer periphery of the upper plate. It does not deform and the balloon-like packing material adheres more firmly to the hole wall, making it possible to reliably seal the upward injection of cement milk.Furthermore, a pressurization port is provided at the tip of the steel material, Since the tip plate is fixed to the tip of this steel material, the cement milk squirted from the injection port at the tip of the steel material is blocked by the tip plate and first penetrates the lower circumferential wall of the anchor hole, and some of it is absorbed at the tip of the steel material. The cement milk flows upward from the gap between the plate and the inner wall of the anchor hole, and as a result, the cement milk penetrates further down the anchor hole than in the case without the tip plate, and the tip The presence of the plate further increases the pull-out strength, and the upper plate also provides resistance to pull-out, resulting in an anchor device with strong pull-out strength.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway cross-sectional view showing one embodiment of the anchor device of the present invention, and FIGS. 2 to 6 are partially cutaway cross-sectional views showing an example of the process of constructing an anchor using the same anchor device. Figure 7 is a partially cutaway sectional view showing another construction example as described above, in which 1 is a hollow part, 2 is a steel material, 3 is a press inlet, 4 is a tip plate, 5 is an upper plate, and 6 is a packing. Material, 7
is a fluid injection pipe.

Claims (1)

[Claims] 1 An injection port is provided at the tip of a steel material having a hollow part for press-fitting cement milk, and a tip plate with a diameter slightly smaller than the diameter of the anchor hole drilled in the ground is fixed to the tip of this steel material, and the tip plate is fixed to the tip of the steel material. An upper plate with a diameter slightly smaller than the diameter of the anchor hole drilled in the ground is fixed to the front side of the base, a balloon-shaped packing material is attached to the bottom side of the upper plate, and a fluid injection pipe is connected to the packing material. An anchor device comprising: