JPH06146273A - Prc pile and combined member of its frame body - Google Patents

Abstract

PURPOSE:To set a PRC frame body in a formwork and pour mortar therein, so as to obtain a PRC pile of high strength, by combining reinforcement with a PC frame body obtained through a process of welding helical reinforcement on PC steel bars, so as to form a PRC frame body. CONSTITUTION:A plurality of reinforcement 8 arranged in parallel between PC steel bars 5 are tied and combined together into a PC frame body 7 by means of combining members 20. Namely, one steel bar 5 is hooked with one hook 22 of a combining member 20, helical reinforcement 6 and reinforcement 8 are tied together with a straight line part 23 and a recessed part 24. Further, next steel bar 5 is hooked with the other hook 22, reinforcement 8 is tied together with the frame body 7 so as to combine them. Combination with the combining member is appropriately performed for necessary parts, and a plurality of reinforcement 8 are combined with the frame body 7 so as to form a PRC frame body 2. The PRC frame body 2 is set in a formwork, mortar is poured in it, and a PRC pile is centrifugally formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete pile (PRC pile) in which a PRC frame body composed of PC steel rods, reinforcing bars and spiral reinforcing bars is embedded, and a connecting member used for the PRC frame body.

[0002]

2. Description of the Related Art RPC which has recently been improved in bending strength and toughness of prestressed concrete pile (PC pile)
Pile is known (for example, Japanese Examined Patent Publication No. 4-20444). This PRC pile is a PC in a PC pile.
This is a steel rod to which a plurality of reinforcing bars, particularly deformed reinforcing bars, are added in parallel, and has characteristics that combine the respective advantages of a reinforced concrete pile (RC pile) using ordinary reinforcing bars and a PC pile.

FIG. 5 shows a concrete example of such a pile.
The PRC pile 1 is composed of a cylindrical high-strength concrete 3 in which a PRC frame 2 is embedded, and end plates 4 attached to both ends of the PRC frame 2. The PRC frame 2 is arranged in a circle and extends in the axial direction. PC with steel rod 5 and spiral rebar 6 welded
A plurality of reinforcing bars 8 extending in the axial direction are connected to the frame body 7 by connecting members.

In order to make this PRC frame 2, first, a spiral rebar 6 is welded to a plurality of PC steel rods 5 which are supported at both ends by supporting tools and arranged in a circle, and the supporting tools are pulled by a tensioning device to prestress. It is made by connecting a plurality of reinforcing bars 8 to the PC frame 7 in the state of being provided with a connecting member. Figure 6 shows PRC
It is a partially expanded perspective view of the frame body 2. A PC frame body 7 formed by fixing a plurality of PC steel bars 5 to a spiral reinforcing bar 6 at a welded portion 10, and a plurality of reinforcing bars 8 arranged in parallel with the PC frame body 7 are a string-shaped connecting member such as a bundle line or a wire. Combined at 11.
That is, the string-shaped connecting member 11 is hooked in this order on the PC steel rod 5, the spiral rebar 6, the rebar 8, and the spiral bar as shown in the figure, and the rebar 8 is sewn by stitching these parts.
It is connected to the C frame 7.

[0005]

However, the conventional method of connecting the reinforcing bar to the PC frame and the concrete pile obtained have the following problems. That is, (1) Since the reinforcing bars are connected to the PC frame by using the frictional force of the wire or the like, the reinforcing bars tend to be loosened during or after the connection to cause the positional deviation of the reinforcing bars. (2) A long wire or the like wound in a coil shape is cut into a predetermined length, the shape is corrected, and a connecting member is produced each time, which is troublesome. (3) A large number of man-hours are required for joining work. (4) It is difficult to keep the bonded state always constant, and therefore the reinforcing bars are likely to be unevenly arranged. (5) The non-uniformly formed PRC frame has a bad influence on the strength of the obtained PRC pile.

Therefore, the present invention has an object to solve such a conventional problem.

[0007]

According to a first aspect of the present invention, which solves the above-mentioned problems, a PC frame body, in which a plurality of PC steel rods arranged in a circle and extending in the axial direction are welded with spiral reinforcing bars, is further provided. It is a PRC pile in which a PRC frame body formed by joining a plurality of reinforcing bars extending in the direction of the joint by a joining member is embedded. The connecting member is composed of a corrugated suture spring having hooks formed at both ends, and the adjacent reinforcing bars, spiral reinforcing bars and PC steel bars are sequentially sutured by the suturing springs, whereby the reinforcing bars are bonded to the PC frame. It is characterized by.

A second invention for solving the above-mentioned problems is a connecting member in the above-mentioned PRC pile, which is composed of a corrugated suture spring having hooks formed at both ends thereof and is arranged in a circular shape in the axial direction. It is used to form a RPC frame by connecting a plurality of axially extending reinforcing bars to a PC frame in which spiral reinforcing bars are welded to a plurality of extending PC steel bars.

[0009]

Embodiments of the present invention will now be described with reference to the drawings.
FIG. 1 is a partial perspective view of a PRC frame body used in the PRC pile of the present invention, which is the same as FIG. 6 except for a connecting member. As shown in the enlarged view of FIG. 2, the coupling member 20 in FIG. 1 has an intermediate portion 21 and hooks 2 provided at both ends thereof.
2 is a stitching spring configured by the intermediate portion 21
Is composed of a straight portion 23 and a recess 24 formed substantially in the center thereof.

This sewing spring can be formed by molding a spring material that is normally used, for example, a spring material obtained by quenching a hard steel wire of C type. The dimensions are the diameters of the PC steel bar 5, the spiral rebar 6 and the rebar 8 to be joined,
It can be appropriately determined depending on the distance between them. For example, in the coupling member 20 shown in FIG.
It is made larger, and is designed to hook the hook 22 on the PC steel rod 5 and the recess 24 on the reinforcing bar 8 having a larger diameter. The length of the straight portion 23 is slightly larger than the distance between the PC steel rod 5 and the reinforcing bar 8. Further, as shown in the drawing, a folded portion may be provided at the end of the hook 22.

Since the connecting member 20 is composed of the linear portion 21, the concave portion 24 and the hook 22 which project from the linear portion 21 in only one direction, there is an advantage that the manufacturing is easy. However, it is also possible to make the straight portion 23 arcuate. FIG. 3 is an example of such a coupling member, wherein the coupling member 30 is a suture spring constituted by an intermediate portion 31 and hooks 32 provided at both ends thereof, and the intermediate portion 31 is provided between a pair of arcuate portions 33. It comprises a recess 34 provided.

FIG. 4 shows an example of still another coupling member. The connecting member 40 is one of the hooks 2 of the connecting member 20 shown in FIG.
2 is omitted, and the intermediate portion 4 is formed in a linear shape.
A pair of hooks 42 are formed on both ends of the No. 1. In this connecting member 40, one hook 42 is hooked on, for example, the PC steel rod 5, the middle portion 41 is hooked on the spiral reinforcing bar 6, and the other hook 42 is hooked on the reinforcing bar 8 to sew them together, and the reinforcing bar is connected to the PC frame. Connect to body 7. Although not shown,
It may be a spiral suture spring that is obtained by stretching a coil spring.

In FIG. 1, a plurality of reinforcing bars (deformed bars) 8 arranged in the middle of the PC steel rod 5 in parallel with the PC steel bar 5 are sewn and connected to the PC frame 7 by a connecting member 20.
That is, the PC steel rod 5 is attached to one hook 22 of the connecting member 20.
The straight portion 23 of the intermediate portion 21 and the concave portion 2
4. Further, the spiral reinforcing bar 6, the reinforcing bar 8 and the spiral reinforcing bar 6 are sewn to the remaining straight portion 23 in this order, and finally the next PC steel bar 5 is hooked on the other hook 22 to rebar 8
Are sewn and joined to the PC frame 7. Such joining by the joining member 20 is appropriately performed on a necessary portion, and the plurality of reinforcing bars 8 are joined to the PC frame 7 to form the PRC frame 8. The connecting member 20 is thus deformed by the spring action at the time of suturing, and the elastic force (returning force) of the connecting member 20 presses the reinforcing bar 8 against the PC frame 7 to stably and firmly bond it.

As shown in FIG. 1, the PRC frame 2 formed by connecting the appropriate portions of the reinforcing bars 8 to the PC frame 7 with the connecting members is set in the mold by a conventional method, and then mortar is injected and the PRC frame is centrifuged. It is formed into a PRC pile.

[0015]

The present invention configured as described above has the following effects. (1) Since the suture spring having hooks formed at both ends is used as the connecting member, the reinforcing bar can be connected to the PC frame with one touch. (2) Due to the spring action of the above-mentioned connecting member, the reinforcing bar can be firmly and stably connected to the PC frame, and therefore, the connecting portion is not loosened during or after the connecting work. (3) The bonded state can always be kept constant, so that the reinforcing bars can be arranged uniformly. (4) The PRC pile obtained by using the uniform PRC frame is excellent in strength and the like.

[Brief description of drawings]

FIG. 1 is a partial perspective view showing a state where a reinforcing bar is connected to a PC frame using a connecting member of the present invention.

FIG. 2 is an enlarged front view of the connecting member in FIG.

FIG. 3 is an enlarged front view of another example of the coupling member of the present invention.

FIG. 4 is an enlarged front view of another example of the coupling member of the present invention.

FIG. 5 is a front view in which a concrete pile in which a PRC frame is embedded is partially cut, and a cross-sectional view taken along the line AA.

FIG. 6 is a partial perspective view of a conventional PRC frame body.

[Explanation of sign]

 1 PRC pile 2 RPC frame 3 High-strength concrete 4 End plate 5 PC steel rod 6 Spiral rebar 7 PC frame 8 Reinforcing bar 10 Welding part 11 Joining member 20 Joining member 21 Middle part 22 Hook 23 Straight part 24 Recess 30 Joining member 31 Intermediate part 32 Hook 33 Arc part 34 Recess 40 Joint member 41 Intermediate part 42 Hook

Claims (2)

[Claims] 1. A plurality of Ps arranged in a circle and extending in the axial direction.
In a PRC pile in which a PR frame formed by joining a plurality of axially extending reinforcing bars with a joining member is embedded in a PC frame body in which a C steel rod is welded with a spiral reinforcing bar, the joining member has hooks at both ends. It consists of a corrugated suture spring that is formed, and the reinforcing bar that is adjacent by the suture spring,
A PRC pile, characterized in that a spiral rebar and a PC steel bar are sewn in sequence, whereby the rebar is bonded to the PC frame. 2. A PC frame body comprising a corrugated suture spring having hooks formed at both ends, the PC frame rods being arranged in a circle and welding helical rebars to a plurality of axially extending PC steel rods, and a plurality of axially extending reinforcing bars. A connecting member for connecting the above to form a PRC frame.