JPH0340914Y2 - - Google Patents

Description

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

Prior Art An anchor has been developed in which the tip of a PC steel material is fixed to a cylindrical concrete trunk body, and the anchor is anchored in a drilled hole using grouting material.

The problem with such fixed anchors is that when used as permanent anchors, concrete trunks do not have sufficient pressure resistance and are not reliable.

In order to solve these problems, a fixing anchor with prestressed steel fixed to a cast cylinder may be considered.

The cast iron cylindrical body has high pressure resistance, making it a highly reliable anchor.

Problems to be solved by this invention In order to obtain the desired anchorage length in such anchoring anchors, it is conceivable to connect multiple cylindrical bodies, but the cylindrical bodies are made of cast metal and the yield strength is increased Due to the nature of the material, joints made by welding cause changes in the material of the cylindrical body, making it impossible to satisfy the required yield strength and quality characteristics.

On the other hand, the method of connecting the cylindrical bodies with each other using a coupler has a problem in that the wall thickness of the cylindrical body becomes thinner due to the provision of the male thread, and the yield strength of the cylindrical body decreases.

Means for Solving the Problems The fixing anchor according to this invention has a cylindrical cast body having a protrusion on its outer circumferential surface, and a male screw having a height equal to or less than the protrusion protrudes from the outer circumference at the end of the body. A plurality of cylindrical bodies are connected by a coupler screwed onto the male thread, and the ends of the PC steel material are fixed to the cylindrical bodies and buried in the drilled hole.

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

In the figure, 1 is a cylindrical body made of cast iron. The cylinder has a cylindrical shape, and irregularities are formed on the outer circumferential surface and the inner circumferential surface. Two spiral protrusions 2, 2 intersecting with each other are protruded on the outer circumferential surface to form an uneven surface. Further, one end of the cylindrical body 1 is closed by a bearing pressure wall 3, and a plurality of tension steel insertion holes 4 are bored in the bearing pressure wall 3.

At the end of the cylindrical body 1 on the side opposite to the bearing pressure wall 3, a male thread 12 having a height equal to or less than the height of the protrusion 2 is protruded and screwed onto the outer circumferential surface.

A separate cylinder 1 is attached to the cylinder 1 by a coupler 13.
are connected. The coupler 13 has a cylindrical shape, and has a female thread 14 threaded in the opposite direction from the middle part in the longitudinal direction on its inner circumferential surface.

A plurality of grooves 15 parallel to the center line are formed on the outer peripheral surface of the coupler 13. The male threads 12, 12 at the ends of the cylindrical bodies 1, 1 are screwed into the female threads 14 of the coupler 13 having such a structure to connect them.

A tension steel material 6 inserted into the unbonded sheath 5 is inserted into the cylindrical body 1. A polyethylene sheath or the like is adopted as the unbonded sheath 5,
As the tension steel material 6, a PC steel bar, a PC steel wire, a PC steel stranded wire, etc. can be adopted.

The tip of the tension steel material 6 is inserted into the tension steel material insertion hole 4 of the cylindrical body 1.
It is made to protrude outward from and is fixed by the compression apartment 7.

A trunk body A is formed by filling the cylinder 1 with a hardening material 8 such as mortar or concrete.

This trunk body A is located in a hole 9 in the ground, and a grout material 10 such as mortar or concrete is injected into the hole 9.

Since the groove 15 is recessed in the outer peripheral surface of the coupler 13, the grout material 10 flows down through the groove 15 to the bottom of the drilled hole 9.

In the anchoring anchor as described above, when a prestressing force is introduced by tensioning the tension steel material 6, it is able to withstand a large load because it is anchored to the grout material 10 along the unevenness of the outer periphery of the trunk body A. .

Further, if the trunk body A has the protrusion 2 protruding also on the inner circumferential surface of the cylindrical body 1, the trunk body A will have good adhesion with the hardening material 8 and will be strong.

This invention has the above-mentioned structure, but as shown in FIG. You can.

Alternatively, the trunk body A may be used in which the tension steel material 6 is simply fixed to the cylinder body 1 by the compression apartment 7 without filling the hardening material 8 into the cylinder body 1.

Effects of the invention Since the fixing anchor according to the invention has the above-described configuration, the following effects can be obtained.

○B Since the tension steel material is fixed in a cast cylinder with strong pressure resistance, the anchor tensile force is transmitted to the cylinder, making it a highly reliable compression type fixed anchor.

○B Since the cylindrical body is made of cast metal, it can be made as thick as designed, making it a strong and reliable fixing anchor.

○C The cylindrical body is made of cast metal, and convex portions can be easily formed on the surface of the cylindrical body, allowing for good adhesion to the grout material.

○D Because a male thread with a height equal to or less than the protrusion was provided on the outer circumferential surface of the cylinder and connected by a coupler, the wall thickness of the part of the cylinder where the male thread was screwed did not become thinner and the effective cross-sectional area did not decrease. The plurality of cylindrical bodies provides a main body with a large fixing area and no decrease in strength.

○The cut puller can also serve as a spacer to prevent the cylinder from directly touching the ground, so the cylinder can be sufficiently buried in the grout to create a high-quality anchor body.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of the connecting portion of the cylindrical body of the fixing anchor according to this invention, Fig. 2 is a perspective view of the coupler, Figs. 3 and 4 are longitudinal sectional views of the trunk body, and Fig. 5 The figure is an explanatory diagram of the fixing anchor, and FIG. 6 is a cross-sectional view of the fixing anchor in a drilled hole. A... Trunk body, 1... Cylindrical body, 2... Protrusion, 3...
Bearing wall, 4... Tension steel material insertion hole, 5... Unbonded sheath, 6... Tension steel material, 7... Compression apartment, 8... Hardened material, 9... Hole drilling, 10... Grout material, 12... ...Male thread, 13...Cup puller, 1
4...female thread, 15...groove.

Claims (1)

[Scope of utility model registration request] A male thread with a height equal to or less than the height of the protrusion is screwed into the end of a cylindrical cast body having a protrusion on the outer circumferential surface, protruding from the outer circumferential surface, and a coupler screwed onto the male thread is used to connect a plurality of cylinders. 1. A fixing anchor, characterized in that the cylindrical body is connected to the cylindrical body, the end of a prestressed steel material is fixed to the cylindrical body, and the anchor is buried in a drilled hole.