JP2000212956A - Pile head treatment method for prestressed concrete pile - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a pile head treatment method for prestressed concrete piles, which is easy to work on site and lower in cost as compared with the conventional method. SOLUTION: In a method of connecting a connection reinforcement of a foundation slab to a pile head of a prestressed concrete pile, a prestressed concrete pile having a female screw hole 4a in a pile head end plate 4 and a tip of a connection reinforcement 1a of the foundation slab in a factory in advance. A bolted connecting reinforcing bar 1 with a bolt 1b fixed thereto is manufactured, carried into a construction site, a prestressed concrete pile is inserted into the ground, and a bolted connecting reinforcing bar 1 is inserted into a female screw hole 4a of a pile head end plate 4. The bolt 1b is screwed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile head treatment method for joining a pile head of a prestressed concrete pile and a connecting reinforcing bar of a foundation slab.

[0002]

2. Description of the Related Art Generally, the foundation of a building is made of concrete. Although the shape and size of the building vary depending on the type and height of the building to be built, concrete is cast at the site or the factory is constructed. In the above, concrete piles are manufactured in advance.

[0003] Therefore, in the conventional foundation construction method,
a. There is a construction method in which concrete is poured after a pile reinforcing steel cage is inserted into a hollow portion of a pile head of a concrete pile to fix a foundation slab and a connecting reinforcing steel.

[0004] Also, b. A male screw formed at the tip of the connection reinforcing bar of the foundation slab is screwed into a female screw hole formed in the pile head end plate of the concrete pile, a coupler is tightened, and a predetermined axial force is introduced to connect the connecting bar integrated with the pile. There is a construction method to build and fix it to the foundation slab.

Further, c. There is a construction method in which the connecting rebar is directly connected to the pile head end plate of the concrete pile by stud welding and fixed to the foundation slab.

[0006] d. After fixing the fixing bracket to the female screw hole formed in the pile head end plate of the concrete pile, a method of screwing the male screw formed at the tip of the connecting rebar into the female screw hole formed at the top of this fixing metal and fixing it to the foundation slab is known. is there.

[0007]

However, a. According to this method, when burying a pile, soil or soil cement may be inserted into the hollow part of the pile, and the removal work is time-consuming and costly. Therefore, a method has been proposed in which a paper or plastic cylindrical sleeve is used to receive and remove the soil cement so that the treatment can be easily performed even if it is inserted. However, in this method, there is a problem in that it costs much to dispose of the cylindrical sleeve in which the cement is solidified after the extraction as waste.

[0008] Further, b. In this method, since a male screw is formed directly at the tip of the connection rebar, it is not possible to use a connection rebar that is smaller than the diameter of the female screw hole formed in the pile head end plate.
There is a problem that the cost is increased because the diameter of the connecting rebar must be increased.

Further, the above c. According to the above method, there is a problem that the welding work depends on the weather because of on-site welding, and a special technician requires a skilled technician. There was a problem.

The above d. However, this method requires the production of a special fixing metal fitting and the operation of forming a male screw at the tip of the connecting rebar, so that the cost is still high.

In view of the above points, an object of the present invention is to provide a pile head treatment method of a prestressed concrete pile which is easy to work on site and is inexpensive as compared with a conventional method.

[0012]

According to the present invention, there is provided a method for connecting a connecting bar of a foundation slab to a pile head of a prestressed concrete pile, the method comprising the steps of: A bolted connecting rebar with a bolt fixed to the tip of the connecting rebar of the foundation slab is manufactured and carried into the construction site, and the prestressed concrete pile is inserted into the ground. The gist of the present invention is a pile head treatment method for a prestressed concrete pile, characterized by screwing a bolt of the above-mentioned connecting rebar with a bolt.

Further, the step of fixing the bolt to the tip of the connecting reinforcing bar of the foundation slab is based on a pile head treatment method of a prestressed concrete pile which is fixed by using a friction welding device.

Further, when the bolt of the connecting rebar with a bolt is screwed into the female screw hole of the pile head end plate of the prestressed concrete pile, a nut is screwed in advance to the bolt. The pile head treatment method is the main point.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. First, an embodiment of a pile head treatment method for a prestressed concrete pile according to the present invention will be described. FIG. 1 is a perspective view showing a bolted connecting rebar used in the pile head treatment method of a prestressed concrete pile according to the present invention. As shown in FIG.
Is formed by fixing a connecting reinforcing bar 1a, which is a deformed reinforcing bar, and a bolt 1b by friction welding, and a joint portion 1c bulges slightly thicker than the diameter of the connecting reinforcing bar 1a. Here, the friction welding is to fix the connecting rebar 1a, and to abut one end of the fixed connecting rebar 1a while rotating the head of the bolt 1b to press and join the connecting rebar 1a. The contact portion between the surfaces of the two members is heated by frictional heat generated between one end of 1a and the head portion of the bolt 1b, and is melted and then solidified to be joined.

FIG. 2 is a view showing a prestressed concrete pile used in the present invention. As shown in FIG. 2, the prestressed concrete pile 2 has a hollow cylindrical shape, and a plurality of PC steel rods 3 are provided inside the cylindrical side wall.
Are connected to the concrete 2a under tension. One end of the PC steel bar 3 is fixed inside the pile head end plate 4 made of metal. Further, a plurality of through holes 4a are provided on the upper surface of the pile head end plate 4, and a female screw 4b into which the bolt 1b is screwed is formed inside the through hole 4a. The through hole 4a in which the female screw 4b is formed is a through hole 4a that is provided in advance to connect the device and the pile head end plate 4 at the time of manufacturing a prestressed concrete pile.

FIG. 3 is a partial sectional view showing a state in which a connecting reinforcing bar with bolts is fixed to a pile head end plate of the prestressed concrete pile according to the present invention. As shown in FIG. 3, the through hole 4a of the pile head end plate 4 is formed with a female screw 4b. Also, the head 3 of the PC steel bar 3 is located near the through hole 4a.
There is provided a through hole 4c in which a is hooked inside the pile head end plate 4. When screwing the bolt 1b at the tip of the connecting rebar 1 with bolts into the through hole 4a of the pile head end plate 4 where the female screw 4b is formed, the nut 5 is screwed in advance to the bolt 1b. After 1b is screwed into the pile head end plate 4 to the part where the female screw 4b is cut, the nut 5 is
It is turned toward the upper surface of the pile head end plate 4 and is fixed in contact with the upper surface of the pile head end plate 4.

FIG. 4 is a view showing a state in which a plurality of connecting reinforcing bars are fixed to the pile head end plate. The mode of use of the present invention will be described with reference to FIG. First, as described above, the connection reinforcing bar 1 with bolts formed by friction-welding the bolt 1b and the connecting bar 1a, which is a deformed reinforcing bar, and the PC steel bar 3 are tensioned to cast concrete 2a. The fixed prestressed concrete pile 2 is manufactured and cured in a factory in advance. Next, the bolted connecting rebar 1 and the prestressed concrete pile 2 are transported to the construction site. Then, at the construction site, after the prestressed concrete pile 2 is embedded in the ground, the nut 1 is screwed to the bolt 1 b at the tip of the connecting reinforcing bar 1 with bolts, and the bolt 1 b is attached to the female screw 4 b of the pile head end plate 4. It is screwed. And nut 5
Then, the upper surface of the pile end plate 4 is tightened to fix the bolted connection reinforcing bar 1 to the prestressed concrete pile 2.

It goes without saying that various embodiments can be adopted without departing from the spirit of the present invention. For example, the method of fixing the bolt 1b to the tip of the connection reinforcing bar 1a is not limited to friction welding, and may be fixed by various fixing methods such as stud welding as long as the standard strength and rigidity can be obtained. Good thing.

[0020]

As described above, the present invention relates to a method for connecting a connecting reinforcing bar of a foundation slab to a pile head of a prestressed concrete pile. A bolted connecting rebar with a bolt attached to the tip of the connecting rebar of the foundation slab is manufactured, carried into the construction site, and the prestressed concrete pile is inserted into the ground. The gist of the present invention is a pile head treatment method for prestressed concrete piles, characterized by screwing the bolts of the above-mentioned connection rebar with bolts into the holes. Can be selected, and the length and strength of the screw portion can also be freely selected. Further, since commercially available bolts and nuts can be used, the cost can be reduced.

In addition, the step of fixing the bolt to the tip of the connecting reinforcing bar of the foundation slab is based on a pile head treatment method of a prestressed concrete pile which is fixed by using a friction welding device. In addition to being able to perform the work easily, stable strength and rigidity can be obtained.

Further, when a bolt of the connecting rebar with a bolt is screwed into a female screw hole of a pile head end plate of the prestressed concrete pile, a nut is previously screwed to the bolt. Since the pile head treatment method is the main point, the connecting rebar is securely fixed to the pile head end plate, and the construction is simple and there is no special technology, so the cost is reduced compared to the conventional construction method Can be done.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a bolted connecting rebar used in a pile head treatment method of the present invention.

FIG. 2 is a view showing a prestressed concrete pile used in the present invention.

FIG. 3 is a partial cross-sectional view showing a state where a bolted connection reinforcing bar is fixed to a pile head end plate.

FIG. 4 is a diagram showing a state in which a plurality of connection reinforcing bars are fixed to a pile head end plate.

[Explanation of symbols]

 1 Connection Rebar with Bolt 1a Connection Rebar 1b Bolt 2 Prestressed Concrete Pile 2a Concrete 3 PC Steel Bar 3a PC Steel Bar Head 4 Pile Head End Plate 4a, 4c Through Hole 4b Female Screw 5 Nut

Claims (3)

[Claims] 1. A method of connecting a connecting bar of a foundation slab to a pile head of a prestressed concrete pile, wherein the prestressed concrete pile having a female screw hole in a pile head end plate and a tip of a connecting bar of the basic slab are previously stored in a factory. A bolted connecting rebar with a bolt fixed to it is carried into the construction site, the prestressed concrete pile is inserted into the ground, and the bolt of the bolted connecting rebar is inserted into the female screw hole of the pile head end plate. A pile head treatment method for prestressed concrete piles, characterized by being screwed. 2. The method according to claim 1, wherein the step of fixing the bolt to the tip of the connection reinforcing bar of the foundation slab is performed by using a friction welding device. 3. The method according to claim 1, wherein a nut is previously screwed onto the bolt of the connecting rebar with a bolt when screwing the bolt of the connection rebar with a female screw into the female screw hole of the pile head end plate of the prestressed concrete pile. Head treatment method for prestressed concrete piles.