JPH047228Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an underground anchor material that is used to support the thrust of a structure in the ground or to support the sliding force of the ground. It is.

[Conventional technology]

There are generally two types of underground anchors: tension type (attached type) and compression type. Tension-type anchors provide resistance through the adhesion force between the tension steel and grout, while compression-type anchors provide resistance through compressive force at the bottom of the grout.

When an external force is applied to a tension type anchor, the stress transmitted from the tensile steel to the anchor body is sequentially transmitted from the upper part to the lower part, so a large stress is applied to the upper part of the anchor body, and the grout material deteriorates over many years. There is a problem that cracks will occur, groundwater etc. will seep through, and the tensile steel will corrode, and since the adhesion area with the grout material must be large, a long anchor material is required. , etc. have drawbacks.

Compared to the above-mentioned tension type anchors, compression type anchors do not have tensile force acting on the grout material at the boundary between the free length of the anchor body and the anchorage, so the property of concrete is that it is weak in tension but strong in compression. There is no risk of tension cracks occurring, which is a problem with tension type anchors, and therefore it can be said to have a structure suitable as a permanent anchor.

Conventionally, compression type anchors have a structure as shown in FIG. 3, for example. That is, the anchoring portion a over the required length of the tip of the tensile steel material 1
is surrounded by a deformed pipe 2 and filled with grout material 3, and a bearing plate 4 is tied to the end of the tensile steel material 1, and the anchor material thus made is inserted into a hole 6 drilled in the ground 5. After filling the gap between the anchor material and the hole 6 with the anchor fixing grout material 7,
The tensile steel material 1 is fixed by applying tension.

[Problem that the invention attempts to solve]

However, in the above-mentioned compression type anchor material, only the bearing plate applies compressive force to the grout material 3 due to the tension of the tensile steel 1, and the bearing plate is limited in diameter according to the diameter of the hole in the ground. Because it is done,
The bearing surface is small, so there is a problem that the stress exceeds the design value, causing the grout to break and corrode the steel.

[Means for solving problems]

The present invention solves the problems with conventional compression type anchors as described above, and attempts to increase the resistance of the anchor by dispersing the stress without burdening the grout material with only a small pressure-receiving surface. The means for achieving this will be explained using FIGS. 1 and 2, which correspond to embodiments. In the present invention, the tip of the tensile steel material 1 buried in the hole 6 of the ground 5 is connected to the sheathed pipe. 8 and fixed to the pressure bearing plate 4, and a partial pressure porous tube 10 having a large number of penetrating small holes 9, 9, which surrounds the sheath tube 8 and is formed long toward the base end side, is fixed to the pressure bearing plate 4. Furthermore, a waterproof pipe 2 such as a deformed pipe is arranged surrounding the bearing plate 4 and the outside of the partial pressure porous pipe 10.
0 and the waterproof pipe 2 with grout material 3,
It is characterized in that a tensile steel material 1, a pressure bearing plate 4, and a partial pressure porous pipe 10 are integrally connected via a grout material 3.

[Effect]

Since the present invention is constructed as described above, when the tensile steel material 1 is tensed, compressive force is exerted on the grout material 3 in the waterproof pipe 2 from the bearing pressure plate 4, but that force is fixed to the bearing pressure plate 4. The partial pressure will be transmitted to the grout material 3 via the porous pipe 10. Therefore, the tension force of the tensile steel material is
In addition, compressive force is applied to the grout material 3 by both the pressure-bearing plate 4 and the partial pressure perforated pipe 10, preventing concentrated stress caused by only the small pressure-bearing surface of the pressure plate as in the past, and preventing the anchor The resistance of the material is significantly increased.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2.

In FIG. 2, reference numeral 1 denotes a tensile steel member such as a steel cable or a steel rod, on the distal end of which a fixed section section a is formed, and on the proximal end thereof the fixed section section a is used as an emergency section section b. In the fixed section part a, a bearing plate 4 is externally fitted and fixed to the distal end of a sheath tube 8 through which the tensile steel material 1 can be inserted. A partial pressure perforated tube 10 having a small hole passing through is fixed to the sheath tube 8 with a gap, and the tensile steel material 1 is inserted into the sheath tube 8 and its tip is extended to the tip side longer than the pressure bearing plate 4. The tensile steel material 1 and the bearing pressure plate 4 are connected by protruding, fixing the fixing member 11 to the protruding portion, and fixing the fixing member 11 to the pressure plate 4 by welding 12 or the like. Further, on the outside thereof, a waterproof pipe 2 made of an irregularly shaped pipe such as a corrugated polyethylene pipe or a steel pipe is arranged with a gap therebetween, and inside this irregularly shaped pipe 2, a sheathed pipe 8, Bearing plate 4,
The spaces between the partial pressure porous pipe 10, the fixing member 11, and the irregularly shaped pipe 2 are filled with a grouting material 3 made of mortar, adhesive, etc. The irregularly shaped pipe 2 and the grout material 3
They are integrally connected via.

In addition, the sheath pipe 8 is extended or the tensile steel member 1 in the tension section b on the proximal end side of the fixed section a is extended except for the required length of the proximal end thereof. The sheath tube 8 is connected to and covered with another similar sheath tube 8'.

The anchor material of the present invention is constructed as described above, and in order to install it, it is necessary to insert the anchor material into the ground 5 into the hole 6 drilled in the ground 5, as is conventionally done.
An anchor material is inserted through a hole 14 provided in a structure 13 to be supported, and a gap between the anchor material and the hole 6 is filled with a grout material 15 such as mortar, concrete, adhesive, etc. for fixing the anchor. After the grout material 15 has hardened, the tensile steel material 1 is tensed, and the washer 17 is attached to the fastening seat 16 of the structure 13.
It is fixed with a fastener 18.

[Effect of idea]

As explained above, the anchor material of the present invention is
The partial pressure perforated pipe was fixed to the bearing plate fixed to the tensile steel inside the waterproof pipe in the fixed section, and the grout was filled inside and outside of the partial pressure perforated pipe, so the compressive force on the grout material was small compared to the conventional method. It is possible to apply sufficient pressure to the partial pressure porous pipe through the large number of holes in the partial pressure porous pipe, not only depending on the area of the bearing plate, thereby avoiding concentrated stress on the grout material and preventing damage or destruction of the grout material. It eliminates fear, significantly increases the resistance of the anchor material, and prevents corrosion of the tensile steel material due to damage to the grout material, and exhibits excellent effects as a permanent anchor.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing an installed state of an anchor material according to an embodiment of the present invention, Fig. 2 is an enlarged side sectional view of the main part of the inventive anchor material, and Fig. 3 is a main part of a conventional anchor material. FIG. 1... Tensile steel material, 2... Waterproof pipe, 3... Grout material, 4... Bearing plate, 5... Ground, 6... Hole, 8
... Sheath pipe, 9 ... Through hole, 10 ... Partial pressure porous pipe material, 11 ... Fixing member, 13 ... Structure, 15
...Grout material.

Claims (1)

[Scope of utility model registration request] The tip of the tensile steel material buried in the hole in the ground is
The pressure plate is fixed to the bearing pressure plate through the inside of the sheath tube, and to the bearing pressure plate, a partial pressure porous tube having a large number of penetrating small holes, which is formed long toward the proximal side surrounding the sheath tube, is fixed to the bearing pressure plate, and further, these bearing pressure plates, A waterproof pipe such as a deformed pipe is placed surrounding the outside of the partial pressure perforated pipe, and grout is filled in the partial pressure perforated pipe and the waterproof pipe.
An underground anchor material characterized by integrally connecting a tensile steel material, a bearing plate, and a partial pressure perforated pipe via grout.