JPS5961618A - Foundation - Google Patents

Abstract

PURPOSE:To strengthen the bonding between the head of a pile and the concrete foundation by a method in which concrete piles are driven into the through holes of a lower frame bottom plate below the surface of ground and the upper parts of iron bars inside the frame and the pile head are formed inside of the upper frame on the surface of ground. CONSTITUTION:Through holes 6 of an inside diameter larger than the outside diameter of a concrete pile 5 are formed in the bottom plate 4 of a lower frame 3 formed a hole 2 drilled for constructing a basement, etc., on the surface of ground 1. The upper parts of iron bars 8 set inside the head 7 of the pile 5 and also inside the frame 3 are formed inside of the upper frame 9 having a larger sectional area than the frame 3. Ready-mixed concrete is flowed into the frame 3, the head 7 of the pile 5, and the frame 9 to form a foundation 10. The piles 5 can thus be driven into given places through the through holes 6, and the head 7 having tough strength of the pile 5 and the foundation 10 can be strongly bonded with each other.

Description

Detailed Description of the Invention The present invention provides a new foundation, in particular, a lower frame is formed in a recess formed from the ground surface, and a through hole with an inner diameter slightly larger than the outer diameter of the concrete pile is formed in the bottom plate of the lower frame. forming the concrete pile, leaving the head of the concrete pile in the lower frame, driving the concrete pile through the through hole, and raising the upper part of the reinforcement in the lower frame and the head of the concrete pile above the ground surface. This relates to a foundation formed in the formed upper frame, and a concrete foundation formed in the lower frame, the head of the concrete pile, and the upper frame, and the concrete pile is cast into the ground. The head of the concrete foundation is firmly fixed to the concrete foundation.

Conventionally, in order to connect a concrete pile poured into the ground with a concrete foundation, the concrete at the head of the concrete pile is destroyed to expose the internal reinforcement, and the exposed reinforcement is connected to the reinforcement in the concrete foundation. The conventional method was to insert reinforcing bars inside the concrete piles, fill them with concrete, and fix the reinforcing bars to the upper foundation. (This had the disadvantage that the concrete pile at the part connected to the concrete foundation would be destroyed in an earthquake, and the concrete foundation would sink, causing the structure above it to sink. However, as a result of various experimental studies, the present inventor , the present invention is obtained without such drawbacks.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. A recess 2 formed from the ground surface 1 dug for constructing a basement or underground beam will be filled with concrete, iron plate, wooden, etc., with a thickness of 0.5 m to 30 m. The bottom plate 4K of the lower frame 3 is made of concrete, iron plate, wood, etc., and is slightly smaller than the outer diameter of the concrete pile 5 having an outer diameter of 300 to 70011 m and a length of 8 to 15 m. A through hole 6 with a large inner diameter is formed approximately at the center of the bottom plate 4, and the concrete pile 5 is driven into the through hole 6, leaving the head 7 of the concrete pile 50 inside the lower frame 3, and then inserting the concrete pile 5 into the inside of the lower frame 3. concrete pile 50
The upper part of the reinforcement 8 formed inside the head 7 is formed on the ground surface 1 in an upper frame 9 made of iron plate, wood, etc., preferably having a cross section larger than the cross section of the lower frame 3. Fresh concrete is poured into the body 3, the head 7 of the concrete pile 5, and the upper frame 9 to form a concrete foundation 10. In the figure, reference numeral 11 is a stopper to prevent the fresh concrete from falling. The frame 9 is removed after the concrete foundation 1o has hardened.

The outer diameter of the head of the concrete pile 5 is Dl, and the four parts 2
The inner diameter of the upper frame body 9 is set as D2, the depth of the recess 2 is set as L, and the upper frame body 9
Assuming that the inner diameter of the lower part of is , and the average thickness of the upper frame body 9 is T, the dimensional relationship between these is K as follows.

D, = 300 ~ 700 Tomi I D2 = 2 ~
3D.

D3=1~aDt L=1~3D.

'['==1~5D.

In the present invention, a lower frame 3 is formed in a recess 2 formed above the ground surface 1, and a through hole 6 having an inner diameter slightly larger than the outer diameter of the concrete pile 5 is formed in the bottom plate 4 of the lower frame 3. The head 7 of the concrete pile 5 remains in the lower frame 3 and the concrete pile 5 is driven through the through hole 6, and the reinforcement 8 in the lower frame 3 and the head 7 of the concrete pile 5 is The upper part is formed in an upper frame 9 formed on the ground surface 1, and a concrete foundation 10 is formed in the lower frame 3, the head 7 of the concrete pile 5, and the upper frame 9. The concrete pile 5 can be driven into a predetermined position through the through hole 6 of the bottom plate 4, and the concrete foundation 1o can be firmly fixed to the head 7 of the concrete pile 5, which is driven into the ground, so that its strength does not decrease. However, it is a book that has a strong resistance against earthquakes.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the main part of the concrete pile before it is placed, and FIG. 2 is a sectional view of the main part of the concrete pile after it is placed. l...Ground surface, 2...Concavity, 3...Lower frame, 4...Bottom plate, 5...Concrete pile, 6...Through hole, 7...Head, 8...・・・
Reinforcement, 9... Upper frame, 10... Concrete foundation 7-Fuji 11 Figure λ

Claims (1)

[Claims] A lower frame is formed in a recess formed above the ground surface, a through hole with an inner diameter slightly larger than the outer diameter of the concrete pile is formed in the bottom plate of the lower frame, and the head of the concrete pile is formed in the lower frame. The concrete pile is driven through the through hole with a portion remaining, and the upper part of the reinforcement in the lower frame and the head of the concrete pile is formed in the upper frame formed on the ground surface. A foundation characterized in that a concrete foundation is formed within the head of the concrete pile and within the upper frame.