JP3108893B2 - Anchoring method between reinforced cage and pile end plate in PRC pile - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION This invention, PHC pile (hereinafter, PRC piles) reinforced by Haisuji the deformed bar about the fixing how the reinforcing bar cage and pile end plate in.

[0002]

2. Description of the Related Art Conventionally, in a PRC pile, a PC steel bar 31 (main reinforcing bar) for introducing stress and an auxiliary reinforcing bar (consisting of a deformed reinforcing bar) 32 parallel to the PC steel bar are alternately arranged on the same circumference. The reinforcing bars 34 were arranged by arranging the spiral bars 33 outside the PC steel bars 31 and the auxiliary bars 32 (FIG. 4).
(A)). Also, a pile end plate 35 used for the reinforcing cage 34
Has a drill hole 36 composed of a large hole and a small hole at a position corresponding to the PC steel rod 31 and a connecting rod 37 protruding from a lower surface at a position corresponding to the auxiliary reinforcing bar 32 (FIG. 4 (a)
(D)). Then, the PC steel rod 31 having the hook portion 38 formed at the upper end is inserted into the large-diameter side of the daruma hole 36, and the pile end plate 35 is rotated to hook the hook portion 38 to the small hole edge of the daruma hole 36. (FIG. 4C). Also, the connecting rod 37 is connected to the auxiliary reinforcing bar 32.
And fixed to the spiral reinforcing bar 33 with a binding wire (FIG. 4).
(D)). As described above, the reinforcing rod cage 34 and the pile end plate 35 were fixed.

In addition, the reinforcing rod cage 34 with the pile end plate 35 fixed as described above is put into a predetermined formwork, concrete is put into the formwork, stress is applied to the PC steel bar, and centrifugal forming is performed. , Had formed a pile.

[0004]

In the above prior art,
Since the work of binding the connecting rod 37 to the auxiliary reinforcing bar 32 and the spiral reinforcing bar 33 is required, there is a problem that the fixing work between the reinforcing bar cage 34 and the pile end plate 35 becomes complicated.

[0005]

According to the present invention, however, the above-described problem is caused by forming a burrow at a position corresponding to the auxiliary reinforcing bar of the pile end plate, and hooking the auxiliary reinforcing bar to the small hole edge of the burrow. Solved the point.

That is, the present invention relates to a method for fixing the ends of the PC steel rod and the auxiliary reinforcing bar of a reinforcing rod basket comprising an axial PC steel bar, an axial auxiliary reinforcing bar and a spiral reinforcing bar to a pile end plate. A first Daruma hole having a small hole and a large hole corresponding to a PC steel rod, and a second Daruma hole having a small hole and a large hole corresponding to the auxiliary reinforcing bar are respectively formed by drilling a pile end plate. The PC steel rod is inserted into the large hole of the first Daruma hole, and the auxiliary reinforcing bar is inserted through the large hole of the second Daruma hole,
The hook of the auxiliary rebar is set at P from the hook of the PC steel bar.
The steel bar is disposed so as to protrude outward to a length corresponding to the elongation of the steel bar. Subsequently, the pile end plate is rotated to apply a predetermined stress to the steel bar and to hang the hook of the steel bar. A reinforcing cage and a pile in a PRC pile, wherein a hook of an auxiliary reinforcing bar is hooked on a hooking edge of a small hole of the first Daruma hole, and a hooking portion of a small hole of the second Daruma hole. This is a fixing method with an end plate. In addition, the distance between the small hole and the large hole of the Daruma hole corresponding to the PC steel rod and the distance between the small hole and the large hole of the Daruma hole corresponding to the auxiliary reinforcing bar are the same, and the reinforcing rod cage and the pile end in the PRC pile are set. This is a fixing method with a plate.

[0007]

According to the method of the present invention, since the end of the auxiliary reinforcing bar is hooked on the edge of the small hole in the burrow hole of the pile end plate, the auxiliary reinforcing bar and the pile end plate are fixed without the need for a binding operation. be able to. According to the pile end plate of the present invention, since the distance between the small hole and the large hole of the first Daruma hole and the distance between the small hole and the large hole of the second Daruma hole are formed to be the same, By rotating the pile end plate, the PC steel rod and the auxiliary rebar and the pile end plate can be fixed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.

A PC steel bar 1 and an auxiliary reinforcing bar 2 parallel to the PC steel bar 1 are alternately arranged on the same circumference, and a spiral reinforcing bar 3 is provided outside the PC steel bar 1 and the auxiliary reinforcing bar 2. To form the reinforcing bar cage 4. At the upper end of the PC steel bar 1 is formed a hook portion 19 having an annular large diameter, and at the upper end of the auxiliary reinforcing bar 2 is formed a hook portion 16 having an annular large diameter.

The pile end plate 15 attached to the reinforcing bar 4 has the following configuration. That is, in the donut-shaped pile end plate main body 5, first Daruma holes 6, 6 are formed at positions corresponding to the PC steel bars 1. The first Daruma hole 6 is the PC
A small hole 7 having a diameter through which the steel rod 1 can be inserted is drilled, a large hole 8 communicating with the small hole 7 is drilled, and the distance between the center of the small hole 7 and the center of the large hole 8 is D. The large hole 8 is formed in a shape and a size through which the hook 19 of the PC steel bar 1 can be inserted. Further, a latching edge 9 is formed above the small hole 7.

Further, second pile holes 10 are formed in the pile end plate body 5 at positions corresponding to the auxiliary reinforcing bars 2, respectively. The second Daruma hole 10 is provided with a small hole 11 having a diameter through which the auxiliary reinforcing bar 2 can be inserted, and a large hole 12 communicating with the small hole 11 is formed. The distance from the center of the large hole 12 is D as in the case of the first Daruma hole 6. The large hole 12 is formed in a shape and a size that allows the hooking portion 16 of the auxiliary reinforcing bar 2 to be inserted. A latching edge 13 is formed above the small hole 7.

The pile end plate 15 is constructed by attaching the upper end of the reinforcing cylinder 14 to the lower part of the outer periphery of the pile end plate body 5 (FIG. 2). In the above, the side wall of the large hole 8 and the large hole 12 is formed with a screw thread to which a bolt for attaching a tension plate (not shown) for introducing stress can be screwed.

An upper end portion of the auxiliary reinforcing bar 2 of the reinforcing bar cage 4 is formed with a large-diameter hooking portion 16 which can be hooked on the hooking edge 13, and the position of the hooking portion 16 of the auxiliary reinforcing bar 2 (auxiliary reinforcing bar). 2 is provided at a position in consideration of the elongation L of the PC steel bar 1 when stress is applied to the PC steel bar 1.

Next, the pile end plate 15 is fitted into the reinforcing bar cage 4. At this time, the large hole 12 of the first
The upper end of the C steel bar 1 is inserted, and the auxiliary reinforcing bar 2 is inserted into the large hole 12 of the second Daruma hole 10 (FIG. 1B). Next, the pile end plate 15 is rotated in the direction indicated by the arrow 18 by the distance D at the center position of the daruma hole, and the hook 19 of the PC steel bar 1 is hooked into the small hole 7 of the first daruma hole 6. Hook on the toe 9. In this state, the auxiliary reinforcing bar 2 is inserted into the small hole 11 of the second Daruma hole 10 (FIG. 1C).

Next, the pile end plate 15 and a tension plate (not shown) for introducing stress are connected via bolts (not shown). At this time, the bolt is screwed into the large holes 6 and 10 (not shown).

Further, the reinforcing rod cage 4 to which the pile end plate 15 is attached is installed on a predetermined pile forming form (not shown), concrete is poured, and the pile end plate 15 and the tension plate are interposed. A predetermined amount of stress is applied to the PC steel bar 1 in the direction indicated by arrow 17. Due to the introduction of stress, the length of PC steel rod is L
And the pile end plate 15 also moves in the direction of the arrow 17 by the length L, and the hook 16 of the auxiliary reinforcing bar 2
(FIG. 1 (c)), and the fixing of the reinforcing bar 4 and the pile end plate 15 is completed.

Next, centrifugal molding is performed, and after the concrete is hardened, the stress is released to form a pile (not shown).

In the above embodiment, the hooking portion 16 has an annular large diameter, but as shown in FIG. 3, a thread portion 20 is formed on the outer periphery of the upper end portion of the auxiliary reinforcing bar 2, and a lower portion is formed on the thread portion 20. A nut 21 whose outer periphery is formed in a tapered shape may be screwed together to form a hook. In this case, the engaging edge 13 of the small hole 11 of the second round hole 10 of the pile end plate 15 is also formed in a tapered shape in accordance with the tapered shape of the nut 21 (FIG. 3A).
(B)).

[0019]

According to the present invention, since the bundling operation can be eliminated, the PRC pile can be efficiently produced. In addition, since the auxiliary reinforcing bar is directly fixed to the end plate, the reinforcing reinforcing bar and the end plate are integrated, and the strength can be increased with the same auxiliary reinforcing bar.
If the strength is the same, there is an effect that the number of auxiliary reinforcing bars can be reduced, the size of the reinforcing cylinder can be reduced, and the like.

[Brief description of the drawings]

1A is a partially enlarged plan view of a pile end plate used in an embodiment of the present invention, and FIGS. 1B to 1D are partially enlarged longitudinal sectional views at the center of a daruma hole for explaining a fixing method. It is.

2 (a) is a plan view of a pile end plate used in an embodiment of the present invention, and FIG. 2 (b) is a sectional view taken along line AA of FIG. 2 (a).

[3] Also in another pile end plate is a partially enlarged longitudinal sectional view at the center of (a) is partially enlarged plan view of a pile end plate, (b) potbelly hole.

4 (a) to 4 (c) are perspective views illustrating a conventional method, and FIG. 4 (d) is a partially enlarged vertical end view illustrating a connection between a pile end plate and an auxiliary reinforcing bar.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 PC steel bar 2 Auxiliary rebar 3 Spiral rebar 4 Rebar cage 6 First Daruma hole 10 Second Daruma hole 11 Small hole (Second Daruma hole) 12 Large hole (Second Daruma hole) 13 Hanging edge ( (Second Daruma hole) 15 Pile end plate 16 Hook (for auxiliary reinforcing bar)

──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E02D 5/22-5/72

Claims (2)

(57) [Claims] 1. A method of fixing the ends of PC steel bars and auxiliary reinforcing bars of a reinforcing rod basket comprising an axial PC steel bar, an axial auxiliary reinforcing bar, and a spiral reinforcing bar to a pile end plate. A first Daruma hole having a small hole and a large hole corresponding to
Second pile holes each having a small hole and a large hole corresponding to the auxiliary reinforcing bar are drilled to form a pile end plate, and the PC steel rod is inserted into the large hole of the first round hole. The auxiliary reinforcing bars are inserted into the large holes of the two daruma holes, respectively, and the engaging portions of the auxiliary reinforcing bars are projected outward from the engaging portions of the PC steel bars to a length corresponding to the extension of the PC steel bars. Then, the pile end plate is rotated, a predetermined stress is applied to the PC steel bar, and the retaining portion of the PC steel bar is assisted with the retaining edge of the small hole of the first Daruma hole. A method for fixing a reinforcing rod cage and a pile end plate in a PRC pile, wherein a retaining portion of a reinforcing bar is retained on a retaining edge of a small hole of the second Daruma hole, respectively. 2. The method according to claim 1, wherein the distance between the small hole and the large hole of the Daruma hole corresponding to the PC steel rod is the same as the distance between the small hole and the large hole of the Daruma hole corresponding to the auxiliary reinforcing bar. A method of fixing a reinforcing bar and a pile end plate in a PRC pile.