JPH0324665Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention mainly relates to an underground anchor material for supporting the thrust of structures such as walls, beams, and columns in the ground.

``Prior art'' This type of underground anchor has its purpose of use,
Depending on the period, anchors are broadly divided into temporary anchors and permanent anchors. Temporary anchors are usually applied for a period of less than two years and can perform their function without requiring much attention to corrosion of the anchor material in the part of the earth that is embedded in the ground. On the other hand, a permanent anchor, as its name suggests, must be designed so that it can fully perform its function permanently. In particular, when used in ground that contains chemically harmful substances or that is affected by water, seawater, etc., it is necessary to ensure sufficient safety against corrosion.

By the way, various types of underground anchor materials have been used in the past, but it is said that almost none have sufficient functionality as permanent anchors. In order to prevent corrosion of anchor materials, it has recently become common practice to place tensile steel materials (steel cables, steel bars) inside corrugated sheathed pipes, as well as filler material, and cover the tensile steel materials with the filler material and the sheath pipe. I'm getting old.

``Problem that the invention aims to solve'' With the above-mentioned anchor material, which is made of tensile steel covered with a sheathed pipe and filler, the sheathed pipe may be damaged due to changes in the ground after construction, and in such cases, the inside of the sheathed pipe may be damaged. This means that the filler material also cracks, and then water enters and corrodes the tensile steel material. In addition, some of these types of anchor materials are produced in factories and transported to the site, and cracks can easily enter the mortar during transportation or during construction, and if prestressing is introduced after concrete is poured, Cracks may be concentrated at the boundary between the fixed section and the free tension section, or
Since detachment occurs, further improvements are required to sufficiently prevent corrosion of the anchor steel.

``Means for Solving the Problems'' This invention was developed to solve the problems with conventional permanent anchors as described above, and is suitable for fixing sections of tensile steel members buried in holes in the ground. , a perforated pipe surrounding the tensile steel material and a deformed pipe surrounding the outside thereof are arranged, grout is filled in the deformed pipe to integrally connect the tensile steel material, the perforated pipe and the deformed pipe; , the irregularly shaped sheath tube and the porous tube are each extended to a part of the free tension section, and the irregularly shaped tube of this extended portion is filled with a variable composition material.

"Operation" Since the present invention is constructed as described above, the rigidity of the anchor body is increased, and the resistance to bending is significantly increased. In addition, after inserting this into a hole drilled in the ground and fixing it to the ground by filling the space around the fixing section with grout, it is necessary to tighten it with the ground to apply tension to the tensile steel and fix it. will be strongly implemented. Furthermore, the grout material inside the deformed pipes that protect the tensile steel materials is reinforced by perforated pipes and deformed pipes, and has a large resistance to external forces, making it extremely susceptible to damage due to ground movement during construction, transportation, etc. The fixed part is strong as a whole, and furthermore, by adopting a completely watertight system between the fixed section and the free tension section, it is possible to sufficiently prevent water from entering.

"Embodiments" Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In FIGS. 1 to 3, reference numeral 1 denotes a tensile steel material such as a steel cable or steel rod, the distal end of which is used as a fixed section a, and the proximal end used as a tension section b. This tensile steel member 1 may be formed throughout both sections, but as shown in FIG. You may also wear them.

In the fixed section part a of the tensile steel material 1, a perforated pipe 3 such as a pipe with a large number of small holes, a wire mesh cylinder, or a cylinder made of expanded metal surrounds the fixed section part a, and there is a gap between the tensile steel material 1 and the perforated pipe 3. The proximal end is fixed to the coupling ring 2. moreover,
A deformed pipe 4 such as a corrugated polyethylene pipe or a deformed steel pipe is arranged outside the porous pipe 3 with a gap therebetween, and its base end is fixed to the coupling ring 2. Then, the space between the tensile steel material 1, the perforated pipe 3, and the irregularly shaped pipe 4 is filled inside the irregularly shaped pipe 4, and the mortar and
It is filled with a grouting material 5 made of concrete, adhesive, etc., and the tensile steel material 1, the perforated pipe 3, and the irregularly shaped pipe 4 are integrally connected. On the outside of the irregularly shaped pipe 4, a required number of spacers 6 are arranged at intervals in the length direction, and a large number of tension rods 6 are arranged radially.
a, 6a protrude in an arc shape.

The tensile section b of the tensile steel material 1 is covered with a protective tube 7 such as a synthetic resin tube except for the required length of the base end, and a protective tube 7 such as a synthetic resin tube is provided on the outside with a gap. The sheath tube 8 is arranged, and the gap between the protection tube 7 and the sheath tube 8 is filled with grease 9.

In order to install the anchor material of the present invention constructed as described above, as has been conventionally done,
An anchor material is inserted into a hole 11 drilled in the ground 10 through a hole 13 provided in a structure 12 to be supported on the ground 10, and first, the hole 11 in the fixed section a and the irregularly shaped pipe 4 are inserted.
A grout material 14 such as mortar, concrete, adhesive, etc. for fixing the anchor is press-fitted into the gap between the anchor and the anchor. After the grout material 14 solidifies, the tension section b
The gap between the hole 11 and the sheath pipe 8 is also filled with grout material 15 such as mortar or concrete,
A washer 17 and a tightening nut 18 attached to a fastening seat 16 of the structure 12 apply tension to the tensile steel member 1 and fix it.

FIG. 4 shows another embodiment of the present invention.
The tensile steel material 1 has a fixed section part a and a tension section part b.
It is made up of one piece that runs through the entire area. The irregularly shaped pipe 4 and the perforated pipe 3 are both extended over a part of the required length (for example, 500 to 1000 mm) of the tension section b, and the irregularly shaped pipe 4 in the extended part
The inside is filled with a variable material 20 such as grease. In this embodiment, there is a fixed section a filled with grout 5 between the deformed pipe 4 and the tensile steel material 1, and a tension section b connected thereto.
Even if a crack occurs at the boundary part C when prestressing is introduced or during transportation or construction, water will be prevented from entering that area and corrosion of the anchor steel material will be sufficiently prevented. become.

"Effects of the invention" As explained above, the anchor material of this invention has
Since the fixed section of the tensile steel material is surrounded by a deformed pipe and a perforated pipe, and the grout is filled therein, the filled grout material is strengthened by the presence of the perforated pipe, and the tensile steel material and the deformed pipe are The bonding force of the grout increases, and the tensile steel can be strongly fixed, and the presence of the perforated pipe significantly increases the resistance to bending of the grout, reducing the occurrence of cracks in the grout. become. In other words, when prestressing is introduced, the tensile steel material is pulled with a large force, so conventionally, two large cracks of 0.5 to 1 mm width, which allow water to penetrate the grout material, occur per meter in length. However, in the case of the present invention, due to the presence of the porous pipe, even if a crack occurs, the crack will be dispersed into small particles of 0.1 to 0.2 mm, which are small enough to not penetrate water. As a result, the waterproofing effect of the grout material itself is significantly improved. As a result, multiple corrosion prevention can be achieved by the irregularly shaped tube and the filled grout material, including the grout material outside the anchor material, and it exhibits an excellent effect as a permanent anchor.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing the state in which an anchor material according to an embodiment of the present invention is installed, Fig. 2 is an enlarged side sectional view of the main part of the anchor material of the present invention, Fig. 3 is a plane sectional view of the same, and Fig. 4 The figure is a side sectional view showing another embodiment of the present invention. 1... Tensile steel material, 3... Perforated pipe, 4... Deformed pipe, 5, 9... Grout material, 10... Ground, 11
...hole, 12...structure.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In the fixed section of the tensile steel material buried in a hole in the ground, a perforated pipe surrounding the tensile steel material and a deformed pipe surrounding the outside thereof are provided, The tensile steel material, the perforated pipe, and the irregularly shaped pipe are integrally connected by filling the irregularly shaped pipe with grout material.
Underground anchor material. (2) A deformed pipe and a perforated pipe are extended beyond the fixed section of the tensile material to a part of the tension section, and the deformable material is filled in the extended part of the deformed pipe. Scope of claim for utility model registration No. 1
Underground anchor material described in section.