JP3654749B2 - Pile head joint reinforcement mounting structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention attaches a pile head joint reinforcing bar composed of a deformed reinforcing bar or the like which is embedded in the concrete structure and joined to the pile head end plate at one end side when joining the pile head of the PC pile and the concrete structure. Concerning structure.
[0002]
[Prior art]
This type of conventional pile head joint rebar, like the invention described in Japanese Utility Model Laid-Open No. 7-35539, cuts one end of a deformed rebar and processes it into a male thread, or one end of a deformed rebar Is thickly formed by hot forging or the like, and the thickened portion is cut to form a screw.
[0003]
[Problems to be solved by the invention]
Each of the conventional pile head joint reinforcing bars has the following problems.
[0004]
That is, in the former, the outer peripheral surface on one end side of the deformed reinforcing bar is cut to form the male threaded portion, so that the threaded portion becomes smaller in diameter than the reinforcing bar diameter and a cross-sectional defect occurs.
[0005]
Furthermore, since the male thread part that fits the screw hole provided in the end plate of the PC pile is formed by cutting one end part of the deformed reinforcing bar, a deformed reinforcing bar with a thickness larger than that of the threaded hole must be selected and screwed. Don't be. Therefore, from the viewpoint of design strength, an abnormally large (thick) deformed rebar is selected, which is not economical, and because it is a large diameter deformed rebar, it is heavy, difficult to handle, and requires labor. Workability is poor.
[0006]
In the latter case, since one end of the deformed reinforcing bar is processed thickly by hot forging or the like, the dimensional accuracy of the processed part is deteriorated. Therefore, it is necessary to cut the large-diameter portion before forming the male screw portion on the outer peripheral surface, which increases the number of processing steps and increases the cost.
[0007]
The present invention has been made to solve the above-mentioned problems of the prior art, and can select a deformed reinforcing bar having a rebar diameter suitable for the design, and can be handled lightly by using a deformed reinforcing bar having a small diameter. An object of the present invention is to provide an easy and economical mounting structure for pile head joint reinforcing bars.
[0008]
[Means for Solving the Problems]
That is, in the mounting structure of the pile head joint reinforcing bar according to the present invention, the nut is screwed into the screw hole of the end plate of the PC pile through the male screw portion provided at the end portion, and is tightened with the nut screwed into the male screw portion. A spanner hook provided on the other end and a male screw portion that can be screwed into one end side into a screw hole of the end plate and a nut can be screwed into an intermediate extra length portion as pile head joint reinforcing bars fixed to the end plate A bolt body having a portion and a deformed reinforcing bar fixed to the other end side of the bolt body with substantially the same axis, thereby realizing the above object.
[0009]
【Example】
1 to 4 show an embodiment of the present invention. If the structure is demonstrated based on drawing, the pile head joining rebar a used by this invention consists of the bolt body 1 and the deformed rebar 4. FIG. The bolt body 1 has a male thread portion 2 formed by rolling or cutting while leaving a part of the outer peripheral surface of the round bar, and the other end side portion is pressed by a header or the like to form a hexagonal shape. The wrench span part 3 is used. Further, as the deformed reinforcing bar 4, a reinforcing bar having a diameter suitable for the design is used.
[0010]
The end face of the bolt body 1 on the side of the spanner hook 3 and the end face of the deformed reinforcing bar 4 are brought into contact with each other, and the contact part 5 is fixed integrally by friction welding or stud welding to constitute the pile head joining reinforcing bar a.
[0011]
Next, a method for attaching the pile head joint rebar a used in the present invention will be described with reference to FIGS. 3 and 4. A number of screw holes 8 are provided at appropriate intervals in the end plate 7 fixed to the pile head of the PC pile b.
[0012]
With respect to such a PC pile b, the pile head joining rebar a is screwed into the male threaded portion 2 of the bolt body 1 in advance with the nut 6 close to the spanner hanging portion 3, and the male threaded portion 2 is connected to the PC pile b. It is screwed into the screw hole 8 of the end plate 7.
[0013]
Then, a spanner or a jig for rotation is engaged with the spanner hanging portion 3 of the bolt body 1, the pile head joint rebar a is rotated, and the bolt body 1 is a concrete portion on the lower surface side of the end plate 7 in the PC pile b. If the nut 6 is tightened in the direction of the end plate 7 after being screwed into contact with the pile, the pile head joining rebar a is firmly fixed to the PC pile b.
[0014]
In addition, it replaces with the said nut 6, Even if it uses the coupler etc. which provided the screw hole, it acts similarly to the above.
[0015]
5 to 7 show other embodiments of pile head joint reinforcing bars used in the present invention. If the structure is demonstrated based on drawing, the volt | bolt body 11 in this pile head joining reinforcing bar a1 is a hollow shape, The external thread part 12 is formed by rolling or cutting, leaving the other edge part 19 in the outer peripheral surface. Is formed. Other reference numerals denote the same parts as those in FIGS.
[0016]
Therefore, as shown in FIG. 6, after inserting the end portion of the deformed reinforcing bar 4 into the end portion 19 of the hollow bolt body 11, the end portion 19 of the bolt body 11 is squeezed with a die or the like. At the same time as squeezing and crimping the end portions to fix the narrowed portions 15, the outer peripheral surface of the end portion 19 is formed on the hexagonal spanner hanging portion 13, thereby configuring the pile head joint rebar a <b> 1.
[0017]
This configuration can also be used in the same manner as in the first embodiment.
[0018]
【The invention's effect】
In the pile head joint reinforcing bar mounting structure according to the present invention, a male threaded portion that fits into a screw hole provided in an end plate of a PC pile, a bolt body having a spanner hanging portion, and a deformed reinforcing bar are prepared, and the bolt body and Since the pile head joint reinforcement of the structure which fixed the deformed reinforcement is used, there exist the following advantages.
[0019]
(B) Pile head joint reinforcing bars made of deformed reinforcing bars with the required reinforcing bar diameter can be produced with screw diameters suitable for various screw holes provided on the end plate of the PC pile, which is beneficial for work.
[0020]
(B) Regardless of the screw hole provided in the end plate of the PC pile, select a deformed reinforcing bar with a rebar diameter suitable for the design, and replace the deformed reinforcing bar with a large diameter screw hole provided in the end plate of the PC pile. Since it can also be attached, the deformed reinforcing bar does not become thicker than necessary and is economical.
[0021]
(C) Since deformed reinforcing bars with an appropriate diameter can be used, workability is improved during transportation.
[0022]
(D) Since the deformed reinforcing bars can be used as they are without being processed, the deformed reinforcing bars do not have a cross-sectional defect, and a predetermined reinforcing bar strength is ensured.
[0023]
(E) Even when thin deformed reinforcing bars are used, the strength of the threaded portion of the pile head joint rebar against the screw hole provided in the end plate of the PC pile is large, and the strength of the pile head joint rebar can be secured. .
[0024]
(F) Since the pile head joint rebar has a spanner hook, the pile head joint rebar can be screwed into the screw hole provided on the end plate of the PC pile easily and easily. improves.
[0025]
(G) Simple construction and easy production at low cost.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of a pile head joint reinforcing bar used in the present invention.
FIG. 2 is a front view showing a state before the pile head joint reinforcing bar of FIG. 1 is fixed.
FIG. 3 is a perspective view showing a use state (attachment structure) of the pile head joint reinforcing bar of FIG. 1;
4 is an enlarged partial cross-sectional view of a main part in FIG. 3. FIG.
FIG. 5 is a front view showing another embodiment of a pile head joint reinforcing bar used in the present invention.
FIG. 6 is a partial cross-sectional view of the pile head joint reinforcing bar of FIG. 5;
FIG. 7 is a front view showing a state before the pile head joint reinforcing bar of FIG. 5 is fixed.
[Explanation of symbols]
a, a1 ... pile head joint rebar, b ... PC pile, 1,11 ... bolt body, 2,12 ... male screw part, 3, 13 ... spanner hanging part, 4 ... deformed rebar, 5 ... contact part (adhering part) , 6 ... nuts, 7 ... end plates, 8 ... screw holes, 15 ... narrowed-down parts (adhering parts), 19 ... end parts

Claims (1)

The pile head joint rebar is fixed to the end plate by screwing the pile head joint rebar into the screw hole of the end plate of the PC pile through the male screw portion provided at the end, and tightening the nut screwed into the male screw portion. A spanner hook provided on the other end side of the mounting structure, wherein the pile head joint rebar is screwed into the screw hole of the end plate on one end side, and a nut can be screwed into an intermediate extra length portion A pile head joint rebar mounting structure comprising a bolt body having a portion and a deformed rebar fixed to the other end side of the bolt body at substantially the same axis.

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