JPS6019817A - Concrete pile - Google Patents

Abstract

PURPOSE:To obtain a concrete pile having a large horizontal bearing strength by a method in which shape steel materials having a rail-shaped cross section and a thicker top end portion are set at an interval by arranging them in such a way that the center line connecting the top end and bottom end of the shape steel material is in parallel with the radial direction of the cross section of each pile. CONSTITUTION:A large number of shape steel materials 2 of a rail-shaped cross section are arranged at an interval in the cross sectional area of the concrete layer 3 of a concrete pile body 1 in such a way that the center line L connecting the top end and bottom end of the shape steel materials 2 is in parallel with the radial direction of the cross section of each pile. When a horizontal force acts on the pile body 1, the pile body can exhibit a high bending strength and a high elasticity because the shape steel materials 2a and 2b in parallel with the direction of the horizontal force withstand the horizontal force in particular.

Description

[Detailed description of the invention] The present invention relates to concrete piles.

Conventionally known foundation piles for structures can be broadly classified into RC piles made of concrete, PC piles, steel pipe piles, and composite piles of N4 pipes and concrete. Among concrete piles, R and C piles have been used for ceiling suspension for a long time because they are easy to manufacture and the advantage of concrete's strong compressive force can be effectively utilized as the supporting force of the pile. However, this RC
Although piles have an advantage in terms of supporting capacity, they have the disadvantage of being weak and prone to cracking on the concrete surface. Of course, when cracks occur, buckling becomes more likely to occur in those areas, and the internal reinforcement corrodes due to the intrusion of groundwater, eventually causing the pile to lose its function.

In order to make up for the drawback of RC piles being prone to cracking, PC piles, which have pre-stressed concrete, were later proposed, but while PC piles have the advantage of being less prone to cracking, There is tension in the steel wire. Because of the lack of so-called viscosity, there is a problem that if a bending moment larger than a predetermined value is applied, the prestressed wire will break and the prestressing will be meaningless.

The present invention aims to provide a new type of concrete pile that can solve the problems of the above-mentioned R, C piles and PC piles.

The concrete pile according to this invention basically consists of PC
Although it depends on the type of pile, it does not necessarily have to be based on the type of PC pile, and it can also be applied to RC pile. In addition, in the present invention, even when adopting a PC pile type, a concrete reinforcing material other than PCli material can be used to fully demonstrate the viscosity of the pile, instead of the shaft reinforcement material in the conventional concrete pile. The function of the pile is to compensate for the tensile force of the concrete inside the pile, which is different from that of the A-type pile. The first objective is to use shaped steel materials.

Next, the concrete pile of the present invention will be explained with reference to the illustrated embodiment. Fig. 1 is a 4-sectional view showing the structure of the cross section of the concrete pile, and the pile body 1 is centrifugally formed with concrete 1.
A large number of shaped steel members 2 having a rail-shaped cross section are arranged at predetermined intervals as reinforcing members along the pile axis direction within the cross section of the concrete layer 1 and layer 3 . These shaped steel members 2 differ from the round rod shaft reinforcing bars in conventional concrete piles, as shown in Fig. 2 a, b,
As shown in c, a vertically elongated rail-shaped cross section in which the top end 4 has a wall thickness t in the board width W direction compared to the bottom end 5, and the board width W is larger than the board thickness H is used. . In addition, this shaped steel material 2 is oriented such that the thick top end 4 is located on the outer peripheral side of the concrete layer 3 in the cross section of the concrete layer 3, and the center line connecting the top end 4 and the bottom end 5 is They are arranged in a direction parallel to the radial direction of the pile cross section, that is, in a radial direction with respect to the center of the pile as a whole. As mentioned above, the molded copper material 2 has a top end 4 of the concrete 1 layer 3.
Although it is desirable that they be arranged in such a direction that the bottom end 5 is located on the outer circumferential side, it is not necessary that the bottom ends 5 be arranged in such a direction. However, since it is preferable to arrange the top ends 4 in the direction toward the outer periphery as in the above embodiment, the tip surfaces of the top ends 4 of each shaped steel material 2 are formed in an arc shape as shown in FIG. There is. The reason for this is that when the concrete layer 3 is compacted by centrifugal force, the top 4
This is to prevent an unfilled portion of concrete from occurring on the back side of the concrete, and to make it convenient for contact with the spiral reinforcement 8, which will be described later.

As shown in FIG. 3, these shaped steel members 2 are fixed together by fixed end plates 6 at both ends of the piles so as to maintain the above-mentioned radial array state. Furthermore, as shown in FIG. 1, when arranging the shaped steel materials 2, spiral reinforcements 8 are provided on the outside of the shaped steel materials 2 and the PC steel materials 7 so that the prestressed steel materials 7 are arranged between the respective shaped steel materials 2. It is now possible to do so.

As described above, the concrete pile according to the present invention has a large number of shaped steel members 2 each having a rail-shaped cross section within the cross section of the concrete layer 3 of the concrete pile body l along its center line.
'15 direction and 17. Since they are arranged at intervals of B) bs+ in the horizontal direction, when the water -N+' force is applied from the direction of the arrow as shown in Figure 1, the direction of the horizontal force and 1
- The section steel members 2a and 2b in the 11 direction will particularly resist the horizontal force. In this case, the shaped steel materials 2a and 2b should have a vertically elongated cross section along the center line, and if the top portion 4 is located on the outer peripheral side of the concrete layer 3 as in the embodiment, the top end 4 has a wall thickness t in the plate thickness direction, so the neutral axis P when viewed as a cross section is located outside the center line L -1-, that is, on the outer circumferential side of the concrete layer 3. It exhibits extremely strong resistance. Also, people's shaped steel materials 2
has a wide bottom end 5, so that when the horizontal force is applied, the shaped steel member 2 directly resists the horizontal force.
Not only a and 2b, but also the steel shapes 2c and 2d, which are oriented perpendicular to the horizontal force, have their bottom ends 5 resisting the horizontal force, and all the steel shapes 2 have a special cross-sectional shape. The pile as a whole can exhibit strong bending strength and elasticity.

Of course, if prestress is introduced into the concrete layer 3 by the prestressing steel material 7 together with the steel material 2 having a rail-shaped cross section as in the above embodiment, it goes without saying that cracking of the concrete surface]r11 can be prevented. This prestress introduction letter! C] has the advantage that it is greatly stabilized compared to the conventional inner PC pile due to the viscosity of the antibody produced by the copper material 2 having the rail-shaped cross section. Therefore, the present invention has the advantage that whether it is applied to an RC pile or a PC pile, a concrete pile having a sufficiently strong opening force can be obtained.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing the structure of the pile cross-section of a concrete pile according to the present invention, and Fig. 2 a, b, and c are all cross-sectional views of shaped steel used as shaft reinforcement in the pile of the present invention. Figure 3 is a sectional view taken along ■-■ (J) in Figure 1.In the figure, 1: pile body, 2. shaped steel, 3: one layer of concrete, 4: shaped steel 1 shell end, 5. Type steel bottom end, 6: fixed end,
7 PC steel material, 8: Viper: Abdominal muscle, 1st day 11 Applicant: Sentama Concrete 1, Wangye Co., Ltd. Agent Patent attorney Takeshi 1) Kenichi

Claims (1)

[Claims] 1. As a concrete reinforcing bar installed in the cross section of a concrete pile along the pile axis direction, a shaped steel material with a rail-shaped cross section with a thick top end is installed at the center connecting the 1st page edge and the bottom end of the shaped steel material. A concrete pile characterized in that the lines are arranged parallel to the 1'-radial direction of the pile cross section and spaced apart from each other. 11. The concrete pile according to claim 1, wherein the shaped steel members having a rail-shaped cross section are arranged in such a direction that the top end of the wall thickness is on the outer peripheral side of the concrete layer 1.