JPS60115411A - Manufacture of concrete pile - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a concrete pile for the purpose of increasing impact force, shear force, axial force, and bending moment by locally thickening a concrete column at an arbitrary position. It is something.

Conventionally, centrifugally formed concrete piles have been recognized to have remarkable strength enhancement properties, but due to centrifugal forming, the walls inevitably have the same thickness, and it has been considered extremely difficult to increase the wall thickness locally.

However, in this invention, a partition plate is installed in advance in the mold, concrete is poured in double portions, and centrifugal molding is repeated to form a hollow concrete pile with a predetermined thickness at the appropriate location of the column. It was successful. In this invention, since it is sufficient to install a partition plate in advance in the thick part of the concrete pile, it is not limited to the end part.
It is possible to mold a thick part even in the middle part. Therefore, depending on the purpose of use of the concrete pile, the thick wall portion can be provided at a corresponding position.

That is, to explain this invention with reference to an embodiment, when the shaft reinforcement 2 and the screw reinforcement 3 are installed in the centrifugal forming mold 1, a specific partition plate 4
is installed perpendicular to the central shaft, and the spacer 5 is temporarily attached to the shaft.

Next, an appropriate amount of concrete is poured into the mold, and the mold is rotated to form the first wall 6. Then, by pouring a predetermined amount of concrete into only one side of the mold and rotating the mold again (the mold may continue to rotate even when concrete is being poured), the second
The wall 7 can be integrally molded. In the above, the first
Since the second wall 7 is molded before the wall 6 is hardened, the two walls are of course integrated. Further, since the partition plate is ring-shaped, there is no fear that the first wall 6 will be divided in the axial direction by the partition plate 4.

In the above embodiment, a thick wall portion was provided over an appropriate length from one end of the concrete pile, so only one partition plate 4 was required. However, when only the middle portion of the concrete pile is made thick, , it is sufficient to install the partition plates 4.4a at the same intervals as the required length.

, Also, regarding the reinforcing bars, screws □'' as in the previous example
□In addition to densely wound reinforcement, measures such as making the screw reinforcement larger in diameter or double wrapping can be considered, and if necessary, the reinforcing bar cage 10 (axial reinforcement 8 and screw reinforcement 9) with a partition plate fixed to one end can be considered. It is also conceivable that the interior be equipped with Further, the thick portions are not limited to one location, and may be provided at appropriate lengths at both ends of the concrete pile, for example. In the figure, 11 is an end plate.

That is, according to the present invention, since a ring-shaped partition plate is provided and concrete is poured multiple times and centrifugally formed, concrete piles with locally improved various strengths can be easily manufactured. Moreover, since the necessary reinforcing means can be provided at the necessary locations, it is possible to obtain a purpose-built concrete pile at a relatively low cost.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view of reinforcing bars etc. installed in the mold of this invention, Fig. 2 is a partial sectional view of a concrete pile formed by this invention, and Fig. 3 is a concrete pile of the same structure. A partial sectional view of FIG. 4 is also A in FIG. 2.
-A sectional view. 1... Centrifugal mold 2... Axial bar 3... Spiral bar 4.
...Partition plate 6...1st wall 7...2nd wall Patent applicant Mitani Seksan Co., Ltd. Hasegawa Construction Co., Ltd. - Agent Shoji Suzuki 5-

Claims (1)

[Scope of Claims] 1. A predetermined amount of concrete is poured into a centrifugal mold, and the centrifugal mold is rotated to form a hollow concrete pillar of a predetermined thickness, and then a predetermined amount of concrete is poured into the centrifugal mold. Concrete pile manufacturing method 2 characterized by pouring an appropriate amount of concrete into the partition plate installation part and rotating the mold to provide sections with different wall thicknesses in the axial direction. Concrete pile production method 3 according to claim 1, in which a ring-shaped plate with approximately the same width as the concrete pile is prepared.Concrete pile production method according to claim 1, in which reinforcing bars are installed in advance in the thick part 4. Concrete pile manufacturing method as described in item 3 of the patent claim, in which the reinforcing bars are thick-diameter spiral bars, small-diameter spiral bars with increased density, or double-wound spiral bars.