JP5038261B2 - Pile construction structure and construction method - Google Patents

Description

  The present invention relates to a construction structure and a construction method of a pile in which a pile head and a footing of a pile built in the ground are integrated.

  Conventionally, as shown in FIG. 7, a steel short cylinder 12 having a diameter larger than that of the pile head 1A is formed so as to overlap in the radial direction with a gap formed on the entire circumference of the pile head 1A with respect to the pile head 1A. The lower main bar 3 is welded to the short cylinder 12 and the concrete 13 is filled between the pile head 1A and the short cylinder 12 so that the vertical main bar 3 There was the 1st conventional technology (for example, refer to patent documents 1) constituted so that steel pipe pile 1 may be unified. Moreover, as shown in FIG. 8, while integrating the lower end part of one longitudinal main reinforcement part 3A in the latching | locking part 14 mounted in the pile head 1A of the steel pipe pile 1, it is inward of the pile head 1A. A plurality of reinforcing members 15 in which the upper end portion of one fixed reinforcing bar portion 6A, whose lower portion is embedded in the filling concrete to be filled, are integrated with the engaging portion 14 are arranged in the circumferential direction of the pile head portion 1A, and the footing 2 There was the 2nd prior art currently fixed with pile head 1A in the inside (for example, refer to patent documents 2).

Japanese Patent Laid-Open No. 10-266227 (FIG. 7) Japanese Patent Laid-Open No. 5-187028 (FIG. 8)

  In the first prior art described above, since the lower end portion of the longitudinal main bar is integrated with the short cylinder 12 by welding, there is a possibility that deterioration due to the heat of welding occurs, so that quality in strength cannot be guaranteed. In recent years, in particular, integration technology by field welding tends to be unusable. In addition, since the steel pipe pile 1 and the longitudinal main bar 3 are simply connected by the concrete 13 filled between the short cylinder 12 and the pile head 1A, the connection strength is insufficient. There was a fault that was easy to become.

  In the second prior art, since the longitudinal main reinforcing bar portion 3A and the fixed reinforcing bar portion 6A embedded in the filling concrete are integrally formed in advance via the locking portion 14, the strength is ensured. The reinforcing member 15 provided with one longitudinal main reinforcing bar portion 3A and one fixed reinforcing bar portion 6A is arranged with respect to the pile head 1A so that a plurality of reinforcing members 15 do not move relative to each other. Since the footing 2 cannot be placed unless it is fixed to the base, the workability is poor.

  Therefore, the object of the present invention is to eliminate the above-mentioned problems, and without using integrated construction by welding at the site, the pile can be secured with a large connection strength between the plurality of longitudinal main bars and can be secured by simple construction. The construction structure and construction method are provided.

The first characteristic configuration of the present invention is a pile construction structure in which a pile head and a footing of a pile built in the ground are integrated,
A fixed plate to be placed on the pile head is provided, and the fixed plate is placed on the pile head, and the lower part is buried in the filled concrete in a state in which the filled concrete is filled in the pile head. The upper part of the fixed steel material to be mechanically integrally connected to the fixed plate, a plurality of longitudinal main bars are disposed outside the pile head, and the lower parts thereof are mechanically integrally connected to the fixed plate. By the way.

  According to the first characteristic configuration of the present invention, the pile is integrated by a plurality of fixed steel materials arranged in the pile head and adhesive force by the filling concrete, and the connection strength increases the number of the fixed steel materials, It can be easily raised by increasing the length, and the longitudinal main reinforcement is firmly connected to the pile through the fixed steel material and the fixed plate.

  In addition, by placing the fixed plate on the pile head, a plurality of vertical main bars and a plurality of fixed steel members connected to the fixed plate can be fixed independently. In order to arrange multiple parts around the pile head and make them have a stable posture, they are constructed compared to having to temporarily fix them using connecting members etc. Sex is much better.

  In addition, since the vertical main bars and fixed steel materials are mechanically fixedly connected to the fixed plate, it is possible to connect and fix multiple vertical main bars and multiple fixed steel materials without welding on-site, making it easy to guarantee the stability of strength quality. It was.

  Moreover, since it can be assembled on site, it can be transported as a member before assembly, so that the conveyance becomes easy.

  A second characteristic configuration of the present invention is that the fixing plate is provided with a through-hole for filling the filling concrete.

  According to the 2nd characteristic structure of this invention, after mounting the fixed plate which connected several fixed steel materials previously in a pile head, in a pile head via the through-hole provided in the fixed plate. Can be filled with concrete.

  The third characteristic configuration of the present invention includes a first step of building a pile in the ground, a second step of filling the pile head of the pile with the filling concrete, and inserting a fixed steel material into the filling concrete. And a third step of placing a fixed plate on which the fixed steel material is mechanically fixed on the pile head, and a plurality of vertical main bars arranged on the outside of the pile head, and the lower portions of the fixed plate are respectively fixed to the fixed plate. A fourth step of mechanically fixing the pile head and a fifth step of forming a footing by placing concrete so as to embed the pile head and the longitudinal main bar together.

According to the third characteristic configuration of the present invention, for example, a method of assembling a plurality of longitudinal main bars in a bowl shape as compared with a method in which, after filling the inside of a pile with filling concrete, the reinforcing bar is dropped into the filling concrete. A plurality of longitudinal main bars can be easily fixed and integrated with the pile heads of the piles without the need for assembly bars in the direction.
Moreover, the multiple longitudinal main bars can be freely determined within the outer diameter of the fixed plate in order to arrange the position in the radial direction of the pile outside the pile head to increase the bending strength of the footing. Can be improved.

  The 4th characteristic structure of this invention is the 1st process which builds a pile in the ground, and the fixed which connected the said fixed steel material mechanically beforehand, inserting the lower part of a fixed steel material into the pile head inside of the said pile. A second step of placing the plate on the pile head; and a third step in which a plurality of longitudinal main bars are arranged outside the pile head and the lower portions thereof are mechanically fixed to the fixing plate, respectively. A step, a fourth step of filling the pile head with the filling concrete through the through hole of the fixing plate after the second step or after the third step, and the pile head and the longitudinal main bar together A fifth step of placing the concrete to form a footing so as to be buried.

  According to the fourth characteristic configuration of the present invention, as in the third characteristic configuration, the workability is improved in comparison with the construction method in which the reinforcing bar is dropped into the pile-filled concrete and the vertical main bar is integrated with the pile. Can be improved.

  A fifth characteristic configuration of the present invention is to mechanically fix the fixed steel material and the longitudinal main bars to the fixing plate in advance before placing the fixing plate on the pile head.

  According to the 5th characteristic structure of this invention, only by mounting a fixed plate in a pile head, a fixed steel material and a longitudinal main reinforcement are arrange | positioned in the predetermined position with respect to a pile head, and it leads to the improvement of workability.

  Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 to 3, the pile construction structure according to the present invention has a plurality of steel pipe piles 1 standing in the ground in a plan view. A footing 2 is provided so as to integrate the head 1A.
In the footing 2, a plurality of longitudinal main bars 3 which are integrated with the steel pipe pile 1 and transmit the load from above to the steel pipe pile 1 are arranged around the outside of the pile head 1A and fixed to the concrete. .

The longitudinal main bars 3 have a diameter of about 35 mm and are configured as follows in order to be integrated with the steel pipe pile 1.
In the state where a circular fixed plate 4 made of a steel plate placed on the pile head 1A is provided, the fixed plate 4 is placed on the pile head 1A, and the inside concrete 5 is filled in the pile head 1A, A plurality of fixed reinforcing bars 6 made of deformed steel bars are provided as a fixed steel material in which the lower part is embedded in the filling concrete 5, and the upper parts of these fixed reinforcing bars 6 are integrally connected to the fixing plate 4 via nuts 7. Further, the plurality of longitudinal main bars 3 are arranged on the outer side in the radial direction of the pile head 1A and around the pile heads 1B at equal intervals of 100 mm, and the lower parts thereof are integrated with the fixing plate 4 via nuts 7. It is connected.

  In addition, bond strength can be improved by lengthening the longitudinal main reinforcement 3 fixed to concrete.

  The fixing plate 4 is provided with a first insertion hole 10 through which the upper end portion of the fixed reinforcing bar 6 is inserted inside in the radial direction of the steel pipe pile 1, and a second end through which the lower end portion of the longitudinal main reinforcing bar 3 is inserted. An insertion hole 11 is provided. In addition, a male screw portion into which the nut 7 is screwed is formed at the upper end portion of the fixed reinforcing bar 6, and a male screw portion into which the nut 7 is screwed is formed at the lower end portion of the vertical main reinforcing bar 3. . The upper end portion of the fixed reinforcing bar 6 is inserted into the first insertion hole 10, and the fixed reinforcing bar 6 is fixed by sandwiching the nuts 7 arranged on the upper and lower surfaces of the fixing plate 4. The longitudinal main bars 3 are fixed by inserting nuts 7 inserted through the top and bottom and front and back of the fixing plate 4.

In addition to the steel pipe pile 1, the pile may be a concrete pile or a steel pipe concrete pile.
The fixed steel material may be H-shaped steel, I-shaped steel, or L-shaped steel in addition to the fixed rebar 6.
Further, an annular belt reinforcing bar may be connected around the fixed reinforcing bar 6.
Further, a screw hole may be provided in the fixing plate, and the fixing plate 6 and the male screw of the longitudinal main reinforcing bar 3 may be screwed together and fixed.

  A receiving plate for receiving the filling concrete 5 is attached to the inside of the pile head 1A, and in order to increase the adhesion of the filling concrete 5 to the pile head 1A, The slip preventing member is integrally provided. Therefore, the steel pipe pile 1 and the fixed reinforcing bar 6 are integrally connected via the filling concrete 5 so that the load from the top acting on the longitudinal main bar 3 and the upward pulling force are transmitted to the steel pipe pile 1. is there.

  The plurality of longitudinal main bars 3 are integrally connected with an annular band reinforcing bar 8 wound around the upper side at regular intervals in the upper part so as to surround them. As a result, buckling due to a load from above in the footing 2 and a phenomenon of squeezing outward in the radial direction can be prevented.

Next, the construction method of the steel pipe pile 1 is demonstrated.

[First construction method]
As shown in FIG. 4, the 1st process of building the steel pipe pile 1 in the ground, the 2nd process (FIG. 4 (a)) of filling the pile head 1A of the steel pipe pile 1 with the filling concrete 5 and a plurality of A third step (FIG. 4 (b)) of placing the fixed plate 4 on the pile head 1A while fixing the fixed rebar 6 to the pile head 1A while inserting the fixed rebar 6 into the filling concrete 5; 4th process (FIG.4 (c)) which arrange | positions several vertical main bars 3 on the outer side of the pile head 1A, and fixes the lower part to the fixing plate 4 via the nut 7, respectively, and the pile head 1A and the vertical main bars The fifth step (FIG. 4 (d)) in which concrete is cast to form the footing 2 so as to embed 3 together is sequentially performed.

In addition, after fixing the fixed reinforcement 6 and the vertical main reinforcement 3 to the said fixed plate 4, you may mount in a pile head.
Further, since the fixed plate 4 is placed before the filling concrete 5 is hardened, the fixed plate 4 can be moved and positioned, and the adjustment of the engagement with the reinforcing bars in the upper footing 2 is facilitated.

[Second construction method]
As shown in FIG. 5, a through hole 9 for filling concrete is formed in the fixed plate 4 in advance. And the 1st process of building the steel pipe pile 1 in the ground, and connecting the some fixed reinforcement 6 via the nut 7 previously, inserting the lower part of the fixed reinforcement 6 in the pile head 1A inside of the steel pipe pile 1 A second step (FIG. 5 (a)) for placing the fixed plate 4 on the pile head 1A, and a plurality of vertical main bars 3 are arranged outside the pile head 1A, and the lower portions thereof are fixed to the fixed plate 4, respectively. The third step (FIG. 5 (c)) to be fixed via the nut 7 and the intermediate concrete 5 is filled into the pile head 1A through the through hole 9 of the fixing plate 4 after the second step or after the third step. The fourth step (FIG. 5 (b)) to be performed, and the fifth step (FIG. 5 (d)) to form the footing 2 by placing concrete so as to embed the pile head 1A and the longitudinal main reinforcement 3 together. Are sequentially performed.

In addition, after fixing the fixed reinforcement 6 and the vertical main reinforcement 3 to the said fixed plate 4, you may mount in a pile head.
Moreover, since the said fixed plate 4 can be moved and positioned, adjustment of the engagement with the reinforcing bar in the upper footing 2 becomes easy.
In this construction method, instead of previously setting the receiving plate inside the pile head, a concrete tray corresponding to the disk-shaped body of Japanese Utility Model Laid-Open No. 01-65343 is fixed to the lowermost part of the fixed reinforcing bar. It may be left.

[Another embodiment]
As shown in FIG. 6, in order to mechanically connect the vertical main bar 3 to the fixing plate 4, a female screw part 16 is formed on the fixing plate 4, and the female screw 16 at the lower end of the vertical main bar is formed on the female screw part 16. The portion 18 may be screwed and connected, and the fixed rebar 6 is similarly connected to the female screw portion 17 formed on the fixing plate 4 by screwing and connecting the male screw portion 19 at the upper end of the fixed rebar 6. May be.

In addition, as mentioned above, although the code | symbol was written in order to make contrast with drawing convenient, this invention is not limited to the structure of an accompanying drawing by this entry. In addition, it goes without saying that the present invention can be carried out in various modes without departing from the gist of the present invention.

The longitudinal cross-sectional view of the principal part demonstrated by embodiment of this invention Cross-sectional plan view of footing according to an embodiment of the present invention Cross-sectional view of a pile head according to an embodiment of the present invention Action | operation explanatory drawing which shows the 1st implementation method of embodiment of this invention Action explanatory drawing which shows the 2nd implementation method of embodiment of this invention The principal part longitudinal cross-sectional view which shows another embodiment of this invention Main part longitudinal cross-sectional view showing the first prior art Main part longitudinal cross-sectional view showing the second prior art

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Steel pipe pile 2 Pile head 3 Longitudinal reinforcement 4 Fixing plate 5 Filled concrete 6 Fixed reinforcement 7 Nut 8 Reinforcing bar 9 Through-hole

Claims (5)

It is a construction structure of a pile that integrates the pile head and footing of the pile built in the ground,
A fixed plate to be placed on the pile head is provided, and the fixed plate is placed on the pile head, and the lower part is buried in the filled concrete in a state in which the filled concrete is filled in the pile head. The upper part of the fixed steel material to be mechanically integrally connected to the fixed plate, a plurality of longitudinal main bars are disposed outside the pile head, and the lower parts thereof are mechanically integrally connected to the fixed plate. Pile construction structure.   The pile construction structure according to claim 1, wherein the fixing plate is provided with a through-hole for filling the filling concrete.   In order to form the construction structure of the pile of Claim 1, the 1st process which builds a pile in the ground, the 2nd process which fills the pile head part of the said pile with filling concrete, The fixed steel material is said inside. A third step of placing a fixed plate on which the fixed steel material is mechanically fixed while being inserted into the stuffed concrete is placed on the pile head, and a plurality of vertical main bars are arranged outside the pile head and below that Of a pile having a fourth step of mechanically fixing each of the piles to the fixing plate and a fifth step of placing concrete to form a footing so as to embed the pile head and the longitudinal main bar together. Method.   To form the construction structure of a pile according to claim 2, a first step of building the pile in the ground and a mechanically fixed steel material in advance while inserting a lower portion of the fixed steel material into the pile head inside the pile. A fixing plate connected to the pile head, a second step of placing the fixing plate on the pile head, and arranging a plurality of longitudinal main bars so as to be outward of the pile head, and lower portions thereof mechanically to the fixing plate, respectively. A third step of fixing, a fourth step of filling the pile head through the through hole of the fixing plate into the pile head after the second step or after the third step, the pile head and the A pile construction method having a fifth step of placing concrete to form a footing so as to embed the longitudinal main bars together.   The pile construction method according to claim 3 or 4, wherein the fixed steel material and the longitudinal main bars are mechanically fixed to the fixed plate in advance before placing the fixed plate on the pile head.

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