JPS60212515A - Anchoring method for anchor - Google Patents

Abstract

PURPOSE:To decrease a construction cost, by a method wherein the return part of an unbond PC steel material is locked to the locking part of an anchoring body for anchor in which an elastic rodform anchoring member is securely attached to a bearing member, and after the anchoring body is interposed into an excavated hole, a grout material is injected into the excavated hole. CONSTITUTION:An unbond PC steel material B is interposed through the one insertion hole 5 in a bearing member 1 of an anchor body A for anchor and is turned up. Further, the PC steel material is interposed through the other insertion hole 5 to form a loop shape, and the turn-up part is locked to a locking part 4. After the anchoring body A is interposed into an excavated hole C, a cement series grout material 7 is injected into the excavated hole C to anchor the anchoring body A. This, when the PC steel material B is stretched to use it as an anchor, enables bearing of the steel material by means of the bearing member 1, and permits production of a high anchoring force by means of adhesion stress and frictional resistance stress, both generated between the anchoring member 2 and the grout material 7, and allows a decrease in an installation cost.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a constant anchor starting method. Problems to be solved by this invention Fold it back, lock the folded part to fix it, and after use, pull one end of the PCH fiber to drill a hole, and pull it out from 1, 07 b as an anchoring body C of a loop removal type anchor. We also developed a fixing body as shown in Figure 2.

The fixing body shown in Figure 1 is a steel fixing body with an uneven surface, but there are some problems in that it has to be short due to price considerations, and even if it is short, it cannot be used with steel parts. One example of this is that it is preferable for it to remain underground.

The anchoring body shown in Figure 2 is made of precast concrete, which is preferred because it is inexpensive and can be manufactured in long lengths, and can be destroyed relatively easily even if left underground, but it is preferable to insert it into a borehole. I'm away from work. That is, as shown in Figure 3,
When the cable is inserted into the borehole, the weight of the cable is applied to the anchoring body, resulting in destruction of the anchoring body.

Purpose of the Invention This invention was developed to solve the above-mentioned wheat problems.The construction cost is low, there is no problem even if the fixing body is left in the ground, and it is possible to drill holes in the fixing body. (2) The purpose of this invention is to provide a constant anchor construction method that facilitates the work of inserting the anchor into the interior. It is an object of the present invention to provide a constant anchor construction method that allows construction of an anchor that has high properties as a permanent anchor and is highly economical when used as a permanent anchor.

Composition of the Invention The constant anchor construction method according to the present invention uses a constant anchor attachment body in which a plurality of elastic rod-shaped fixing members having irregularities on the surface are fixed to a bearing member having a locking part that locks the folded part of a prestressed steel material. The above purpose is achieved by folding back the unbonded PC steel material, locking the folded part, inserting it into the drilled hole, and fixing the fixing body by injecting grout into the drilled hole. The goal is to achieve the following.

EXAMPLE Hereinafter, the present invention will be explained in detail based on an example shown in the drawings.

In the figure, A denotes an anchor fixed body, which is composed of a bearing pressure member 1 and an elastic rod-shaped fixing member 2.

The pressure bearing member 1 is made of steel, and has a locking portion 4 having a substantially semicircular cross section protruding from one surface of a plate-shaped bearing pressure plate 3. Insertion holes 5 are formed in the bearing pressure plate 3 adjacent to both ends of the locking portion 4, respectively. Note that 6 is a retainer for the PCC steel material.

A plurality of elastic rod-shaped fixing members 2 are fixedly provided on one surface of the pressure-bearing member 1 . The elastic rod-shaped fixing member 2 is a rod-shaped member having irregularities on its surface, and has a degree of elasticity that allows it to be flexibly bent. Further, the fixing member 2 is made of a non-metal that will break when a load of a certain level or more is applied. The fixing member 2 may be made of glass fiber hardened with epoxy, low-quality ceramics reinforced with steel, chemical fiber processed with resin, or the like. Although a linear fixing member is used in the illustrated embodiment, a fixing member with a somewhat bent shape may also be used.

Next, a method of fixing the unbonded PC steel material B according to the present invention using the anchor fixed attachment body A having the above-mentioned configuration will be explained.

The unbonded PC steel material B is locked in the locking part 4 of the fixing body A. Unbonded PC steel material B has (3) PCG wire, PC steel wire, etc. inserted into the sheath.

This PCC steel material is inserted into one of the insertion holes 5, and the locking part 5 is
Fold it back at , and then insert it into the other insertion hole 5 to form a loop. The fixing body A is positioned at the folded part of the PCC steel material.

In the above state, the fixing body A is inserted into the drilled hole C. Since the fixing member 2 has a certain degree of elasticity, the PCC
Even if the weight of the steel material is heavy, it will not bend or break.
Easy to work with.

After the fixing body A is positioned at the back of the drilled hole C, a cement grout material 7 is injected into the drilled hole C to fix the fixing body A.

When a PCC steel material is used as an anchor under tension, it is supported by the bearing pressure member 1, and an anchoring force is obtained by the adhesion stress and frictional resistance stress generated between the anchoring member 2 and the grout material 7. Since the number of fixing members 2 can be increased arbitrarily, it is possible to widen the fixing area with the grout material 7, and it is possible to obtain a large fixing force.

Even if you pull out the PC steel wire etc. after use and leave the anchor fixing member A in the ground, if it comes into contact with a pile, etc. that is being driven, the anchoring member 2 is non-metallic, so it will be relatively easy to horizontally move. Since it is destroyed by directional loads (direction perpendicular to the axis), it does not cause any problems.

Effects of the Invention Since the present invention has the above-described configuration, the fixing member is manufactured from a material such as glass fiber, so it can be manufactured at low cost, the overall length of the fixing body can be increased, and better fixing power can be achieved. can be obtained. In the underground construction work that will occur thereafter, the rod-shaped anchoring member will be relatively easily destroyed by the lateral load during the driving of piles and sheet piles, and excavation, so there will be no problem even if it is left underground. Since the fixing member has elasticity and bends, it can be easily inserted into the drilled hole. Further, by arbitrarily adjusting the number of fixing members, it is possible to increase the fixing force.

Therefore, its use as a permanent anchor has been greatly expanded.
Since no tensile stress is generated in the anchor-integrated fixing part and only compressive stress acts on the anchor-integrated fixing part, the anchor-integrated fixing part is significantly improved, and so-called compression type anchors can be easily cast.

[Brief explanation of drawings]

1 and 2 are longitudinal sectional views of an anchor using a conventional anchoring body, FIG. 3 is a longitudinal sectional view of a conventional insertion operation into a drilling hole, and FIG. 4 is a perspective view of the anchoring body of the present invention. , FIG. 5 is a side view thereof, and FIG. M6 is a longitudinal sectional view of an anchor using the fixing body of the present invention. A... Anchor constant attachment body, B... PC steel material, C... Hole drilling, 1... Bearing pressure member, 2... Elastic rod-shaped fixing member, 3... Bearing pressure plate, 4... Locking part, 5...・Insertion hole, 6.・Removal stopper, 7
・Grout material. (7) Figure 4 Figure 5 JP-A-Sho GO-212515 (4) 6th rfl Hibiki

Claims (1)

[Claims] (1) A plurality of elastic rod-shaped fixing members having irregularities on the surface are fixed to a bearing pressure member having a locking portion that locks the folded portion of the PC steel material. An anchor constant construction method in which a steel material is folded back, the folded part is locked, and the folded part is locked and inserted into a drilled hole, and a fixing body is fixed by injecting grout into the drilled hole.