JPH0521533Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a means for reliably fixing reinforcing material penetrating into the ground from the foundation frame to the ground in the formation of a ground-reinforced foundation.

(Prior technology) As a method for constructing a foundation that increases the supporting capacity without increasing the volume of the building frame, a hole is drilled into the ground from a vertical shaft, and a reinforcing material such as a deformed steel bar is fixed in the hole.
A ground-reinforced foundation is known in which the base end of this reinforcing material is integrated into the frame of the foundation that is cast into the shaft (Japanese Patent Laid-Open No. 62-25611).

In this case, as a method of fixing the reinforcing material to the drilled hole, as shown in FIG.
is inserted into the hole 3 from the hole 2, and while injecting the fixing material (grout material) 4 from the injection pipe 21,
There is a method of removing the air using the exhaust pipe 20. In this case, the hole 2 is closed with a cloth packer 22 attached to the base end of the reinforcing material 1 so that the injected fixing material 4 does not flow out from the hole 2 into the shaft.

(Problem for the invention) However, in this fixing method, foreign substances such as the exhaust pipe 20 and the injection pipe 21 remain in the hole 3 even after fixing, so the adhesion force of the reinforcing material 1 to the fixing material 4 is reduced accordingly. There was a problem in that the stiffness of the reinforcing material 1 after being integrated with the fixing material 4 was reduced.
Furthermore, since the diameter of the injection pipe 21 is small, it takes time to inject the fixing material 4, and it is necessary to use an expensive material with high fluidity for the fixing material 4.

On the other hand, if the fixing material 4 is injected into the hole 3 first and the reinforcing material 1 is inserted after that, this problem will not occur and a more favorable result will be obtained, but even in that case, the fixing material 4 Since the reinforcement material 1 is anchored by the reinforcement material 4 only on the back side of the reinforcement material 22, the joint between the foundation concrete that will be poured later and the anchorage material 4 is the location where the stress of the reinforcement material 1 is most concentrated. There was a structural problem that caused the problem to occur.

The present invention was developed in view of the above problems, and by improving the fixing car placed at the hole opening, it is possible to firmly fix the reinforcing material to the ground, and also to improve the joint between the fixing material and the concrete structure. The purpose is to configure it inside the building frame.

(Means for achieving the objective) This device comprises a short pipe which fits into the inside of the mouth of a hole drilled into the ground from a vertical shaft with a portion of it protruding into the shaft, and a flange-shaped member which is fixed near the base end of a reinforcing material to be inserted and fixed into the drilled hole into which an anchoring material has been injected and which is inserted into the inside of the short pipe.

(Function) After fitting the short pipe into the hole and injecting the fixing material into the hole from the short pipe opening protruding into the shaft, inserting the reinforcing material to which the collar-shaped member is fixed into the hole, the reinforcing material At the same time, the surplus fixing material corresponding to the intrusion volume overflows from the hole to the outside through the short pipe opening, and at the same time, the fixing material remaining in the hole spreads to every corner of the hole, and the collar-like member is pushed inside the short pipe. At the time of entry, the back side of the brim member is filled with the fixing material without any gaps.

In addition, by setting the fixing position of the collar-like member to the reinforcing material in advance so that the collar-like member is located inside the protruding part of the short pipe into the shaft when the reinforcing material is inserted, the anchoring material and The joint with the concrete frame that will be poured into the shaft later is included inside the frame.

(Example) Embodiments of the present invention are shown in FIGS. 1 to 7.

Fig. 1 shows the structure of the packer. 1 is a reinforcing member made of deformed steel bar, and the packer includes a collar-like member 5 fixed to the proximal end of the reinforcing member 1, and a short tube into which the collar-like member 5 is inserted. (Steel pipe) 6.

As shown in FIG. 2, the outer diameter of the short pipe 6 is large enough to fit into the opening 2 of the hole 3 drilled from the shaft 9 into the ground 7, and a hole is provided on the outer periphery of the intermediate part of the short pipe 6. An annular stopper 8 is formed to determine the entry position into the mouth 2. On the other hand, the outer diameter of the collar-like member 5 is made slightly smaller than the inner diameter of the short tube 6. In addition, reinforcing material 1
The distance from the tip of the reinforcing material 1 to the fixed position of the collar-like member 5 is set so that the collar-like member 5 is located inside the short tube 6 outside the hole opening 2 when the collar-like member 5 is inserted deep into the hole 3. The depth is set slightly larger than the depth of section 3.

Next, the action will be explained.

After the hole 3 is formed in the ground 7 as shown in FIG. 2 by drilling from the shaft 9, the short pipe 6 is inserted into the hole 2 until the stopper 8 comes into contact with the hole 2, as shown in FIG.
Insert it inside. Next, as shown in FIG. 4, the injection hose 10 is inserted into the hole 3 through the opening of the short tube 6, and the fixing material 4 is injected. Hose 10 for injection work
The reinforcing material 1 is not inserted into the hole 3 at this point, so the injection work can be carried out in a short time using the large diameter hose 10. Therefore, the fixing material 4 may have low fluidity.

When the injection of the fixing material 4 is completed in the state shown in FIG. 5, the reinforcing material 1 is inserted into the hole 3 from the opening of the short tube 6 as shown in FIG. The fixing material 4 pushed away by the reinforcing material 1 overflows into the shaft 9 from the opening of the short pipe 6, and fills the gap remaining in the hole 3 without leaving a gap. In this way, when the collar-shaped member 5 eventually enters the short tube 6, the fixing material 4 will flow out only from the gap between the short tube 6 and the collar-shaped member 5. The work is completed by pushing the reinforcing material 1 into the hole 3 to the fullest as shown in FIG. 7, while making sure that the fixing material 4 is filled to every corner.

As described above, the reinforcing material 1 is fixed in the hole 3 using the packer made of the brim member 5 and the short tube 6, so that no foreign matter remains in the hole 3 and the fixing material 4 is spread without any gaps. Because it is attached, it has sufficient adhesion and rigidity, and exhibits an excellent ground reinforcement effect.

In addition, when pouring concrete into the shaft 9, the collar-like member 5 that forms the joint between the anchoring material 4 and the concrete is located on the side of the shaft 9 from the hole opening 2, so these joints are connected to the inside of the shaft. , and does not come to the boundary between the reinforcing material 1 and the frame where stress is concentrated. Therefore, joints do not become structural weaknesses,
The foundation can be constructed in a desirable manner.

(Effects of the invention) As described above, the present invention consists of a short pipe that fits inside the borehole opening and partially protrudes into the shaft, and a short pipe that is fixed near the base end of the reinforcing material and extends inside the short pipe. Since the packer is made up of the brim-shaped member to be inserted, by using this packer and inserting the reinforcing material into the hole where the fixing material has been injected, no foreign matter or voids will remain in the hole.
The reinforcing material can be easily and firmly fixed to the ground.

In addition, by locating the collar-shaped member that forms the joint between the anchoring member and the foundation concrete concrete cast in the shaft inside the short pipe that protrudes inside the shaft, the joint will be contained within the framework when the foundation is completed. ,
Seams can be prevented from becoming structural weaknesses.

Therefore, although the present invention has a simple structure,
Demonstrates excellent effectiveness in forming ground-reinforced foundations.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a packer for processing a perforated hole according to an embodiment of the present invention, and Figs. 2 to 7 show a perforated hole section showing the reinforcing material fixing work using the same packer in order. FIG. Moreover, FIG. 8 is a side view of a reinforcing material in a fixed state showing a conventional example. 1... Reinforcement material, 2... Hole opening, 3... Hole portion, 4...
...Fixing material, 5...Brim member, 6...Short tube, 7...
...ground, 9...shaft.

Claims (1)

[Scope of utility model registration request] A short pipe that fits inside the hole drilled into the ground from the shaft and partially protrudes outside the hole, and a reinforcing material that is inserted into the hole into which fixing material is injected and fixed near the base end. , a puncher for processing a perforated hole, which comprises a collar-like member inserted inside the short pipe;