JP2002256568A - Concrete foundation structure having steel pipe pile and pile head cap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concrete foundation structure having a steel pipe pile, and a pile head cap for easily performing execution work without welding, and capable of enhancing a fixing degree of the steel pipe pile and a concrete foundation. SOLUTION: An internally fitting type cap 3 is fitted in a pile head of the steel pipe pile 1 driven in the ground. The cap 3 has a falling-in port 4a in a top surface. A receiver 5 is provided in the inmost part of the falling-in port 4a for receiving concrete. A part 7 of the concrete of a concrete foundation part 7 projects inside the falling-in port, and is filled in a state of being received in the receiver 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete foundation structure having a steel pipe pile and a pile head cap.

[0002]

2. Description of the Related Art Conventionally, the construction of a concrete foundation having a steel pipe pile has conventionally been carried out, for example, as shown in FIGS. A steel plate 52 is placed and welded W, and a concrete foundation 54 is placed on the steel plate 52, or as shown in FIG.
1) As shown in (b-2), concrete 53 is filled in a steel pipe pile 1 driven into the ground, and a concrete foundation 54 is placed thereon.

[0003]

However, in the former structure, the steel pipe pile 51 and the steel plate 52 must be welded on site, which is not only easy to construct, but also ensures the strength of the welded joint. There was a problem that sometimes it was difficult.

In the latter structure, the amount of the concrete 53 to be filled in the steel pipe pile 51 is large, and the concrete 53 has to be driven deep into the steel pipe pile 51. It is difficult to fill the inside of the steel pipe pile 1 with the concrete 53 at the same time as the concrete work of the base part 54. Therefore, the concrete work of the base part 54 and the filling work of the concrete 53 into the steel pipe pile 51 are separately performed. However, there is a problem that the construction period is long and the construction cost is high.

[0005] Further, in each case, the steel pipe pile 51 is provided.
There is also a problem that it is difficult to secure the degree of fixation between the concrete foundation 54 and the horizontal and vertical directions.

The present invention has been made in view of the above-mentioned conventional problems, and has been made in consideration of the above-mentioned problems. Therefore, it is possible to easily perform construction without welding, and to increase the degree of fixation between a steel pipe pile and a concrete foundation. It is an object to provide a structure of a concrete foundation having a pile and a pile head cap.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a steel pipe pile, which is driven into the ground, in which a cap of an inner fitting type is fitted.
A steel pipe pile is provided, which is provided with a receiver for receiving concrete in the depth of the depression, and a portion of the concrete of the concrete foundation protrudes inward of the depression and is received by the receiver. Solved by the structure of the concrete foundation.

In this structure, the degree of horizontal fixing between the concrete foundation and the steel pipe pile is ensured as follows. In other words, a part of the concrete of the concrete foundation protrudes toward the back through the recess of the top surface of the cap, and the concrete projection engages with the cap in the horizontal direction. Then, in addition to this engagement, the cap and the pile head are engaged in the horizontal direction by fitting the cap to the pile head in an inner fitting manner. Thereby, the degree of fixation of the concrete foundation and the steel pipe pile in the horizontal direction can be sufficiently ensured. In this way, when installing the cap, it is not necessary to weld this cap to the pile head of the steel pipe pile, and it is possible to install it on the pile head without welding just to fit it into the pile head, It can be easily installed and still achieve a firm horizontal fixation as described above.

In addition, since a receiving portion is provided at the back of the recess on the top surface of the cap, the amount of concrete can be limited by receiving the receiving material into the receiving portion. This can be carried out at the time of concrete work for the foundation, and it is not necessary to separately carry out concrete filling work, so that the work can be performed easily, and the construction period can be shortened and the construction cost can be reduced.

In the above structure, the cap includes a ring having a ring opening as a recess, a receiving plate provided at a predetermined distance below the ring, and a leg connecting the ring and the receiving plate, The leg and the receiving plate are inserted into the pile head, the ring is placed on the end of the pile head, and a part of the concrete of the concrete foundation protrudes backward through the ring opening, and the pile head of the receiving plate and the steel pipe pile It is good that it is received with the inner peripheral surface.

[0011] In this structure, a part of the concrete of the concrete foundation protrudes toward the back through the ring opening of the ring on the top surface of the cap, and this concrete projection forms the inner peripheral surface of the cap and the pile head of the steel pipe pile. In addition, the cap also engages with the pile head of the steel pipe pile in the horizontal direction through this concrete protrusion, thereby increasing the degree of horizontal fixation between the concrete foundation and the steel pipe pile. It can be sufficiently secured.

Moreover, since the concrete projecting to the back through the ring opening is received on the inner peripheral surface of the pile head of the steel pipe pile, the concrete base and the steel pipe pile are bonded to each other by the adhesive action of the concrete projection on the inner peripheral surface of the pile head. Can be secured in the vertical direction. In this case, by adjusting the distance between the ring and the receiving plate, the adhesion area between the concrete protrusion and the inner peripheral surface of the steel pipe pile can be adjusted.
By doing so, the degree of vertical fixing of the concrete foundation and the steel pipe pile can be adjusted.

Of course, in the construction, it is only necessary to put a cap on the pile head of the steel pipe pile and to pour a part of the foundation concrete through the ring opening of the cap at the time of the construction of the concrete foundation. it can.
In addition, the cap can be positioned by simply inserting the receiving plate and the legs into the pile head and setting the cap on the pile head.

In the above structure, the cap is
It has a ring with the ring opening as a depression, and a receiver integrally provided with the ring on the lower surface of the ring so as to close the inside of the ring. The receiver is fitted inside the pile head and the ring is attached to the end face of the pile head. It is also possible for the concrete part of the concrete foundation to be placed and protrude into the ring of the ring and to be received in a receiver.

In this structure, a part of the concrete of the concrete foundation protrudes toward the back through the ring opening of the ring on the top surface of the cap, and the concrete protrusion engages with the cap in the horizontal direction. In this case, the receiver fitted into the pile head of the steel pipe pile is engaged with the inner peripheral surface of the pile head in the horizontal direction, thereby sufficiently securing the horizontal fixing degree between the concrete foundation and the steel pipe pile. .

Of course, it is only necessary to fit a cap to the pile head of the steel pipe pile and to pour a part of the foundation concrete through the ring opening of the cap when constructing the concrete foundation. it can.

In the case where the thickness of the ring wall of the ring, that is, the thickness of the ring in the radial direction is set to be larger than the thickness of the pipe wall of the pile head of the steel pipe pile, The push-up force of the steel pipe can be dispersed to the concrete foundation by the ring, and the stress concentration on the concrete foundation by the steel pipe pile can be reduced.

When the cap is provided with a reinforcing bar projecting upward into the concrete foundation, the degree of fixing between the steel pipe pile and the concrete foundation in the vertical direction can be increased.

Further, according to the present invention, a cap is installed on a pile head of a steel pipe pile driven into the ground, and the cap has a recess on the top surface and a receiver for receiving concrete at a depth of the recess. A part of the concrete of the concrete foundation protrudes inward of the depression, is received by the receiver, and is filled so as to protrude inward of the pile head. The structure is also the content.

That is, with this configuration, a part of the concrete of the concrete foundation is filled so as to protrude inward of the pile head, so that the concrete protrusion directly or indirectly in the horizontal direction with the pile head. Engage. Thereby, the degree of fixation of the concrete foundation and the steel pipe pile in the horizontal direction can be sufficiently ensured.

Further, since a receiving portion is provided in the deep portion of the top opening of the cap, the filling amount can be restricted by receiving the concrete into the receiving portion. It can be done at the time of part concrete construction,
There is no need to separately perform concrete filling work, so that the work can be easily performed, and the construction period can be shortened and the construction cost can be reduced.

In this case, the receptacle may be a bag-shaped receptacle or the like, and the cap may or may not be an internal fitting type in which the cap is set in a positioning state on the pile head. .

[0023]

Next, embodiments of the present invention will be described with reference to the drawings.

In the first embodiment shown in FIG. 1, 1 is a steel pipe pile made of a circular steel pipe, 2 is a concrete foundation, and 3 is a pile head cap.

The cap 3 is made of an iron-based metal material or the like.
As shown in FIG. 1A, a ring 4 having a ring opening 4a as a recess, a receiving plate 5 provided below the ring 4 at a predetermined interval, and connecting the ring 4 and the receiving plate 5 are connected. Leg 6
And ...

The ring 4 has a circular outer circumference, the outer diameter of which is set to be substantially the same as the outer diameter of the steel pipe pile 1, and the inner diameter of which is set to be smaller than the inner diameter of the steel pipe pile 1. The thickness of the wall is set to be larger than the thickness of the pipe wall at the pile head of the steel pipe pile 1, and the inner peripheral side of the ring 4 is
Overhangs the side of the borehole.

The receiving plate 5 is a circular plate having an outer peripheral size that is the same as or slightly smaller than the inner peripheral size of the steel pipe pile 1, and is horizontally provided at a predetermined distance below the ring 4. The ring 4 is rigidly connected with four legs 6 provided at intervals in the circumferential direction. These legs 6 are connected to the ring 4 at the lower surface of the inner peripheral side extension 4b of the ring 4, and the cap 3 is
The legs 6 and the receiving plate 5 are inserted into the steel pipe pile 1, and the ring 4 is placed on the pile head end face of the steel pipe pile 1 and set on the pile head of the steel pipe pile 1. In this inserted state, the legs 6 may contact or approach the inner peripheral surface of the steel pipe pile 1 or may be separated from the inner peripheral surface of the steel pipe pile 1. The number of the legs 6 may be three as shown in FIG. 3C, or may be one although not shown. In the case of one, the ring and the receiving plate may be connected at a position eccentric to the side from the center position.

After the steel pipe pile 1 is driven into the ground,
As shown in FIGS. 1 (b) and (c), the cap 3 is set on the pile head of the steel pipe pile 1. In this setting, the receiving plate 5 and the legs 6 are inserted into the pile head, and the ring 4 may be placed on the end face of the pile head. The cap 3 is held in a positioned state by the receiving plate 5 and the legs 6 projecting into the steel pipe pile 1. Therefore, it is not necessary to join the cap 3 and the steel pipe pile 1 by welding. The cap 3 can be easily installed.

After that, as shown in FIG. 1D, concrete for forming the concrete foundation 2 is driven. In this concrete driving,
Part of the concrete is used as the ring opening 4a of the ring 4 of the cap 3.
Pour into the back through. Then, the concrete is received by the receiving plate 5 and the inner peripheral surface of the pile head of the steel pipe pile 1, and a concrete protrusion 7 integral with the concrete of the concrete foundation 2 is provided above the receiving plate 5 inside the pile head. It is formed. The concrete protrusion 7 is received by the receiving plate 5,
Since it is prevented or suppressed from flowing below the receiving plate 5, it is possible to prevent unnecessary inflow of concrete into the steel pipe pile 1, and to drive concrete into the concrete foundation 2. Can be performed in conjunction with the concrete for installation, and the construction can be performed easily.

In the foundation thus formed, a part of the concrete of the concrete foundation 2 projects rearward through the ring 4a of the ring 4 on the top surface of the cap 3, so that the concrete projection 7 As shown in FIG. 2A, the cap 3 and the inner peripheral surface of the pile head of the steel pipe pile 1 are engaged with each other in the horizontal direction.
The cap 3 also engages with the pile head of the steel pipe pile 1 in the horizontal direction via this, so that the degree of horizontal fixation between the concrete foundation 2 and the steel pipe pile 1 is sufficiently ensured.

Furthermore, since the concrete 7 projecting to the back through the ring opening 4a of the ring 4 is received on the inner peripheral surface of the pile head of the steel pipe pile 1, as shown in FIG. The degree of fixation of the concrete foundation 2 and the steel pipe pile 1 in the vertical direction is also ensured by the adhesive action of the concrete projection 7 and the like. In this case, FIG.
As shown in 2), by changing the length dimension of the legs 6..., The adhesion area between the concrete projection 7 and the inner peripheral surface of the steel pipe pile can be adjusted. The degree of vertical fixation of the portion 2 and the steel pipe pile 1 can be adjusted in magnitude.

In addition, as shown in FIGS. 2 (b-1) and (b-2), the wall thickness of the ring wall of the ring 4 placed on the pile head end face of the steel pipe pile 1 is Since the wall thickness is set to be larger than the wall thickness of the pipe wall, the pushing-up force of the steel pipe pile 1 can be dispersed to the concrete foundation 2 by the ring 4 and the stress on the concrete foundation 2 by the steel pipe pile 1 can be transmitted. Concentration can be eased. Not only that, since the concrete projection 7 is supported on its lower surface by the receiving plate 5 of the cap 3, the concrete foundation 2 is not only supported by the ring 4 but also by the receiving plate 5 through the concrete projection 7. Is supported from below, and the stress dispersion effect can be further enhanced.

In the pile head cap 3 of the embodiment shown in FIG. 3D, the receiver 5 is formed of a bag-like material made of a material such as cloth, and a part of the concrete of the concrete foundation 2 is transferred to a ring 4. Is received in the bag-shaped receiver 5 through the ring opening 4a and protrudes. Even in this case, the degree of fixation in the horizontal direction can be increased by the concrete protrusion 7, and the concrete protrusion 7 can be formed together with the concrete work of the concrete foundation 2.

The pile head cap 3 of the embodiment shown in FIG.
This is for increasing the degree of vertical fixation between the steel pipe pile 1 and the concrete foundation 2.
Are erected so that the reinforcing bars 8 project into the concrete of the concrete foundation 2. At the same time, if the length of the legs 6 of the cap 3 is set to be long to secure a large contact area between the concrete projection 7 and the inner peripheral surface of the pile head, the steel pipe pile 1 and the concrete foundation 2 Can be further increased in the vertical direction.

The pile head cap 3 of the embodiment shown in FIG.
A ring 4 having a ring opening as a depression is provided, and a receiver 5 provided integrally with the ring 4 on the lower surface of the ring 4 so as to close the inside of the ring 4. Then, the receiver 5 is fitted into the inside of the pile head, the ring 4 is placed on the end face of the pile head, and a part of the concrete of the concrete foundation 2 projects into the ring of the ring 4 and is received by the receiver 5. The production of the cap 3 may be performed by vertically stacking and joining a ring and a disk having an outer diameter smaller than the ring,
Alternatively, it is performed by forming a recess in the top surface of a low-profile columnar material or a thick-walled disk, forming a step in the middle part in the height direction, and processing the outer diameter of the lower part smaller than that. Alternatively, there is no particular limitation on the manufacturing method.

In this structure, a part of the concrete of the concrete base portion 2 protrudes to the back through the ring opening 4a on the top surface of the cap, so that the concrete protrusion 7
Are engaged with the cap 3 in the horizontal direction, and the receiver 5 fitted in the pile head of the steel pipe pile is engaged with the inner peripheral surface of the pile head in the horizontal direction, whereby the concrete foundation 2 and the steel pipe pile are engaged. 1 can be sufficiently secured in the horizontal direction.

Of course, in the construction, a cap is fitted on the pile head of the steel pipe pile, and when the concrete foundation 2 is constructed,
It is only necessary to pour a part of the concrete of the foundation 2 through the ring opening 4a of the cap ring, and the construction can be easily performed. The cap 3 is set in the positioning state only by fitting the receiver 5 into the pile head.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various changes can be made without departing from the spirit of the invention. For example, in the above embodiment, a case where a circular steel pipe pile is used as the steel pipe pile is shown, but a square steel pipe pile or the like may be used. Also,
The concrete foundation is not limited to a continuous foundation such as a cloth foundation,
The foundation may be an independent foundation or the like.

[0039]

Since the present invention is as described above, it is possible to easily perform the construction without welding and to increase the degree of fixation between the steel pipe pile and the concrete foundation.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment, wherein FIG. 1A is a perspective view of a pile head cap, FIGS. 2B and 2C are cross-sectional side views before and after the cap is fitted to the pile head, respectively, and FIG. FIG. 4 is a cross-sectional side view of a state in which is filled.

FIG. 2A is a sectional side view showing a horizontal force relationship, FIG. 2B is a sectional side view showing a vertical force relationship, and FIG. FIG. 2 is an enlarged cross-sectional side view of the ring portion.

FIG. 3A is a cross-sectional side view showing a vertical force relationship, and FIGS. 3B and 4B are perspective views of a pile head cap in which lengths of legs are different in size. (C) and (d) are perspective views each showing a modification of the pile head cap.

4 (a) and 4 (b) are perspective views of a pile head cap, and FIGS. 4 (b) and 4 (c) are cross-sectional side views before and after the cap is fitted to the pile head, respectively. FIG. 3 is a sectional side view of a state where concrete is filled.

FIG. 5 shows still another embodiment, in which FIG.
(A-2) is a perspective view of a pile head cap, FIGS. (B) and (C) are cross-sectional side views before and after fitting a cap to a pile head, respectively, and FIG. (D) is a cross-sectional side view of a state filled with concrete. .

6A and 6B show a conventional structure. FIG. 6A is a cross-sectional side view showing an example, and FIG. 6A is a sectional view taken along line II of FIG.
FIG. 2 is a sectional side view showing another example, and FIG. 2B is a sectional view taken along line II-II of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Steel pipe pile 2 ... Concrete foundation part 3 ... Pile head cap 4 ... Ring 4a ... Ring mouth (fall-in port) 5 ... Receiving plate (receiver) 6 ... Leg 7 ... Concrete protruding part 8 ... Rebar

Claims (8)

[Claims] An inner fitting cap is fitted on a pile head of a steel pipe pile driven into the ground, and the cap has a recess on a top surface and a receiver for receiving concrete in a depth of the recess. A concrete foundation structure provided with a steel pipe pile, characterized in that a part of the concrete of the concrete foundation part protrudes inward of the sink and is filled in a state of being received by a receiver. 2. The cap comprises a ring having a ring opening as a recess, a receiving plate provided below the ring at a predetermined interval, and a leg connecting the ring and the receiving plate. The receiving plate is inserted into the pile head, the ring is placed on the end of the pile head, and a part of the concrete of the concrete foundation protrudes to the back through the ring mouth, and the inner periphery of the receiving plate and the steel pipe pile The structure of the concrete foundation provided with the steel pipe pile of Claim 1 received by the surface. 3. The cap includes a ring having a ring opening as a recess, and a receiver integrally provided with the ring on the lower surface of the ring so as to close the ring, and the receiver is provided inside the pile head. The steel pipe pile according to claim 1, wherein the ring is placed on the pile head end face by being fitted, and a part of the concrete of the concrete foundation protrudes into the ring of the ring and is received by a receiver. Concrete foundation structure. 4. The concrete provided with a steel pipe pile according to claim 2, wherein the thickness of the ring wall of the ring is set to be larger than the thickness of the pipe wall of the pile head of the steel pipe pile. Foundation structure. 5. The concrete foundation structure having a steel pipe pile according to claim 1, wherein the cap is provided with a reinforcing bar projecting upward into the concrete foundation portion. 6. A ring having an annulus as a recess, a receiving plate provided below the ring at a predetermined interval, and a leg connecting the ring and the receiving plate, wherein the leg and the receiving plate are connected to each other. The ring is inserted into the inside of the pile head so that the ring is placed on the end face of the pile head, and a part of the concrete of the concrete foundation protrudes backward through the ring opening of the ring, and the pile of the receiving plate and the steel pipe pile A pile head cap characterized in that it can be received with the inner surface of the head. 7. A ring having a ring opening as a depression, and a receiver integrally provided with the ring on the lower surface of the ring so as to cover the inside of the ring. Characterized in that a portion of the concrete of the concrete foundation protrudes into the ring of the ring and can be received by a receiver, while being placed on the end face of the pile head. 8. A cap is installed on a pile head of a steel pipe pile driven into the ground, the cap has a recess on a top surface, and a receiver for receiving concrete is provided at a depth of the recess, and a concrete foundation portion is provided. A part of the concrete protrudes inward of the depression and is received by the receiver,
A concrete foundation structure provided with a steel pipe pile, which is filled so as to protrude inward from a pile head.