JPS6261731B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pile structure constituting a so-called knotted concrete pile used as a foundation pile for structures, buildings, etc., and a knotted pile made thereby.

Conventionally, this type of knotted pile is made by charging a reinforcing bar cage into a formwork corresponding to a predetermined pile length, then pouring concrete, etc. (including mortar) into the formwork, and then using a centrifuge or vibrator to open the formwork. It was manufactured by compacting and molding concrete by rotating or vibrating it, curing it with steam or water, and then releasing it from the mold.

In the case of the above conventional manufacturing method, in order to form a single knotted pile as a single unit, a long formwork is required for each pile of different length, and as the pile length becomes longer, The larger the manufacturing equipment, the larger the manufacturing costs. Furthermore, in the case of long piles, it was not easy to transport them from the factory to the construction site.

In view of the above, the present invention was invented to easily manufacture long knotted piles, and provides a pile structure that can be formed using a formwork that is considerably shorter than the pile length. A knotted pile of a predetermined length can be constructed by butting and connecting an appropriate number of these. In particular, consideration has been given to ensuring sufficient connection strength between the pile structures in such cases.

That is, the first aspect of the present invention is characterized by a pile structure having enlarged parts whose diameter is larger than that of the body at both ends in the axial direction, and the enlarged parts at both ends are formed in a symmetrical shape. This makes it possible to obtain knotted piles with strong joint strength. A second aspect of the present invention is characterized by a knotted pile constructed by butting and connecting an appropriate number of the aforementioned pile structures.

Next, embodiments of the present invention will be described based on the drawings.
1 and 2, reference numeral 1 denotes a pile structure, and this pile structure 1 has a shape in which a knotted pile is divided at the center of the joint in the axial direction, that is, a center part is formed at both ends in the axial direction. Enlarged section 2 that becomes a node whose diameter is expanded from body section 7
a, 2b, and these enlarged parts 2a, 2b are symmetrical to each other. The thickness of the enlarged parts 2a and 2b in the axial direction is set so that when they are butted together, a suitable joint can be formed as a jointed pile. The pile structure 1 is formed by pouring concrete or the like into a corresponding formwork and performing centrifugal molding or the like. Reference numeral 3 indicates a hollow portion produced by centrifugal molding, and depending on the molding method, the hollow portion may not be formed. 4 is reinforcing bar or PC steel bar, PC steel wire, PC
These are conductive holes for inserting stranded wires and other PC steel materials, and are provided with multiple sheaths. 5 is a half body of the pile structure 1, and the enlarged parts 2a, 2 are provided at one end.
It has an enlarged part 2c which becomes a node similar to b, and is used as an end part.

In order to assemble the knotted pile A using the pile structure 1 configured as described above, an appropriate number of the pile structures 1 are connected by butting the enlarged parts 2a and 2b to the required length. The connected enlarged portions 2a and 2b become one joint portion 2. At this time, there are cases where the connection is made using a suitable adhesive material, and cases where it is not. In either case, the guide hole 4 of the pile structure 1
Let them match. Moreover, the half body 5 of the pile structure 1 is connected to the end of the connecting body as necessary. Then, a reinforcing bar 6 or a PC steel material or the like is inserted into the guide hole 4 and fixed integrally with the pile structure 1. When using a PC steel material, the steel material is inserted into the guide hole 4 and tightened and fixed at the end while applying a predetermined tensile force. 9 is a push plate, and 9' is a tightening nut. Note that the reinforcing bars 6 and the like may be fixed by injecting grout into the guide holes 4. 8 indicates a connecting portion.

When connected as described above, the pile structures 1, 1 are butted and connected at the large-diameter node 2, and the butt area is larger than the cross-sectional area of the body 7 of the pile diameter, and therefore, the The articulated pile A has a joint portion 8 that is stable in strength and has a good load transmission state.

Note that this can be carried out by providing a connecting means such as a tenon and a tenon on the butting surfaces of the pile structures 1, and in this case, the connection between the pile structures 1 and 1 and the transferability of load are even better. becomes.

Further, it is desirable that the above-mentioned reinforcing bars or PC steel materials, etc. be inserted at the same time as the pile structures 1 are butted together.

As described above, the pile structure of the present invention has enlarged parts that become knots at both ends, and can easily be knotted to a predetermined length by butting and connecting an appropriate number of the pile structures. It is possible to obtain piles and easily connect and assemble them at the construction site. In particular, since the enlarged portions at both ends are symmetrical, it is possible to make a specified knot by having only one type of pile structure with the same shape and by butting the end faces of the same shape, that is, the same diameter and the same area. Piles can be easily connected. This pile structure is quite short compared to the pile length, and the formwork for centrifugal forming and other forms can be shortened accordingly, and there is no need for formwork for different pile lengths. , the manufacturing equipment can be small-scale, which helps reduce manufacturing costs. Furthermore, since the pile structure is considerably shorter than the knotted pile itself, it is easy to transport from the factory to the construction site, especially loading and unloading work, and knotted piles of a desired length can be obtained at the construction site.

The knotted pile of the present invention, which is made by connecting pile structures, has a unique form with knots at regular intervals, and the knots stabilize the buried state and stabilize the connected state. Sufficiently withstands its use.

In particular, when a horizontal force (bending force) etc. is applied to a pile, stress concentration occurs at the boundary between the body and the joint where the cross section changes. Since the joint exists only in the axial center of the node whose diameter is larger than that of the body, and the boundary part is formed integrally, stress concentration at the joint is small and cracks occur. Moreover, since the joint is made at the joints, the joint area due to butting is larger than the cross-sectional area of the body, and the joint strength is even stronger, making it an extremely superior pile despite having a joint structure. Supporting capacity can be obtained. In addition, conductive holes for reinforcing bars, etc. are provided inside the pile structure, and the conductive holes of each pile structure are butted against each other so that they match, and a PC steel material is inserted into the hole, and the PC steel material is pulled under a predetermined tensile force. When tightened and fixed in a state in which concrete is given a At the same time, the connecting surfaces are firmly and closely connected to form a safe knotted pile.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a pile structure showing an embodiment of the present invention, and FIG. 2 is a front view of a knotted pile in which the pile structures shown in the previous figure are connected. DESCRIPTION OF SYMBOLS 1... Pile structure, 2a, 2b... Enlarged part, 2... Knot part, 4... Guide hole for insertion of reinforcing bars, etc., A... Knotted pile.

Claims (1)

[Scope of Claims] 1. A pile structure having enlarged portions having a diameter larger than that of the body at both ends in the axial direction, and the enlarged portions at both ends are symmetrical to each other. 2. The pile structure according to claim 1, wherein a suitable number of conductive holes for inserting reinforcing bars or PC steel materials are formed inside. 3. An appropriate number of pile structures having enlarged parts whose diameter is larger than that of the body at both ends in the axial direction, and the enlarged parts at both ends are symmetrical, are butted and connected to the required length. A knotted pile characterized by: 4 An appropriate number of conductive holes for reinforcing bars or PC steel are formed inside the pile structure, and the conductive holes of each pile structure are butted and connected so that they match, and the reinforcing bars or PC steel are inserted into the conductive holes. The knotted pile according to claim 3, which is fixed by being fixed. 5. The knotted pile according to claim 4, wherein a PC steel material is inserted into the guide hole, and the PC steel material is tightened and fixed in a state where a predetermined tensile force is applied.