JPH047230Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] This invention relates to anchoring anchors.

[Problems to be solved by this idea]

An idea has been developed for fixing using a cylindrical fixing body made of steel or cast iron as a fixing anchor.
A prestressing steel material is passed through this fixing body and fixed, and it is buried in a drilled hole.

In such a fixing anchor, the tensile load acting on the fixing body results in a stress distribution diagram as shown in FIG. In other words, the load is the largest on the bottom side of the ground, and the load is almost zero at the end on the ground side. In other words, it is sufficient that only the bottom side of the anchoring body has the strength to withstand the load, and the strength on the ground side may be small.

It would be a waste of material to uniformly manufacture the entire product by using material even for parts where such strength is not required, and the cost would increase.

This invention was made in order to improve the above-mentioned problems, and the purpose is to provide a fixing anchor that can be manufactured economically and has improved workability.

[Means for solving problems]

In the fixing anchor according to this invention, the wall thickness of the cylindrical fixing body is gradually increased from the ground surface side to the bottom of the drilling hole.

The thinner wall allows for less material, while ensuring strength at the bottom of the hole.

The thinner wall thickness makes it lighter and easier to construct.

〔Example〕

This invention will be explained in detail below based on an embodiment shown in the drawings.

In the figure, 1 is a cylindrical fixing body made of steel or cast metal, and in the embodiment shown in FIG. 1, it is made up of a plurality of cylindrical bodies 2. Irregularities are formed on each outer circumferential surface and inner circumferential surface of the cylindrical body 2. For example, two intersecting spiral protrusions 3, 3 as shown in FIG. 2 are provided on the outer peripheral surface.
It is protruding and has an uneven surface. Further, the bottom side end of the cylinder 2 located on the bottom side of the drilling hole among the plurality of cylinders 2 is closed by a bearing wall 4, and a plurality of tension steel insertion holes 5 are bored in the bearing wall 3. It is set up.

Each wall thickness of the cylindrical body 2 as described above is different,
The cylindrical body 2 having the bearing wall 3 is arranged so that the wall thickness is the thickest and the wall thickness becomes thinner in order. These plural cylinders 2
It connects and integrates. For example, a male thread 6 is threaded on the outer peripheral surface of the adjacent cylindrical body 2 side, and a coupler 8 having a female thread 7 threaded on the cylindrical inner periphery is screwed together to connect them. The male screws 6, 6 of the adjacent cylinders 2, 2 have opposite helical directions, and the female screw 7 on the inner peripheral surface of the coupler 8 also has a helical direction opposite from the longitudinal direction. The cylinders 2, 2 are inserted into the coupler 8 from both sides.
Rotate in the same direction and screw them together.

The unbonded PC steel material 9 with the sheath inserted is passed through the fixing body 1 as described above. As PC steel material 9
PC steel wire and PC steel stranded wire can be used. unbond
The end of the PC steel material 9 is passed through the tension steel material insertion hole 5 and fixed by the compression apartment 10.

Mortar or concrete 1 is placed inside the fixing body 1.
1 and harden.

The fixing body 1 to which the PC steel material 9 is fixed in this manner is inserted into the drilled hole 12 formed in the ground. The wall thickness of the anchoring body 1 gradually increases from the ground surface side to the bottom side of the drilling hole. This drilled hole 12 is filled with a grouting material 13.

In the fixing anchor as described above, when a prestress force is introduced by tensioning the PC steel material 9, the wall thickness on the bottom side of the drilled hole of the fixing body 1 is thick and has sufficient strength to withstand the load. Also, the surface side, which does not receive large loads, is thinner.

Although this invention is made of steel as described above, the wall thickness of the integral anchoring body 1 shown in FIG. 3 may be gradually increased from the ground surface side to the ground bottom side.

[Effect of idea]

In the fixing anchor according to this invention, the wall thickness of the anchoring body is gradually increased from the ground surface side to the bottom of the borehole, so that the bottom side of the ground, which receives a large load, has strength, and the thinner wall thickness on the ground side It can be manufactured at low cost by using fewer materials.

In addition, the thinner wall makes it lighter and easier to transport and install.

[Brief explanation of the drawing]

Figure 1 is a longitudinal sectional view of one embodiment of this invention;
3 is a longitudinal sectional view of another embodiment, and FIG. 4 is a longitudinal sectional view of a conventional fixing anchor. 1... Fixing body, 2... Cylindrical body, 3... Protrusion, 4...
... Bearing wall, 5 ... Tension steel material insertion hole, 6 ... Male thread, 7 ... Female thread, 8 ... Coupler, 9 ... Unbonded PC steel material, 10 ... Compression apartment, 1
1...Concrete, 12...Drilling.

Claims (1)

[Scope of utility model registration request] The thickness of the cylindrical anchor body to be inserted into the borehole formed in the ground is gradually increased from the ground surface side to the bottom of the borehole, and a prestressing steel material is inserted and fixed into this anchor body, and A fixing anchor characterized by being buried in.