JPS6022120Y2 - Foundation pile joint structure - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a joint structure for foundation piles.

Foundation piles that support the load of buildings, etc., are installed by connecting multiple piles in cases where the ground is soft or the depth to the bedrock support layer is deep.

This addition of piles is carried out by welding together the peripheries of seat plates provided at the ends of each pile.

In most cases, piles are sunk with the metal surfaces of their joints exposed, so there is a problem that these parts corrode and their strength gradually decreases.

Particularly in highly corrosive areas such as clay, silt, swampy areas, hot spring areas, and ground containing seawater, the durability of pile joints is significantly reduced due to corrosion.

For this reason, attempts have been made to apply anti-corrosion treatments such as painting the joints of piles or wrapping them with adhesive tape, but these methods are cumbersome to work on, and the anti-corrosion performance deteriorates due to work errors. Not only do they have disadvantages, such as corrosion, but also the anti-corrosion treated area is damaged by friction with the ground when driving the pile, making it impossible to obtain a sufficient anti-corrosion effect.

In view of the above, this idea was developed by attaching a metal ring to the outer circumferential surface of the reinforcing band of the lower pile by welding, and
The upper and lower piles are connected to each other at their seat plates by welding, and the outer circumferential surface of the connected joint is covered with a layer of waterproof tape that is sufficiently wider than the thickness of the seat plate, and the outer circumference of this waterproof tape layer is By covering the surface with a protective band whose lower end is fixed to the ring, the drawbacks of the conventional method can be solved, corrosion of the pile joint part can be prevented and the durability of the pile can be improved, and the structure is simple and easy to work with. The object of the present invention is to provide a foundation pile joint structure that is inexpensive, strong, and free from damage during pile installation.

Hereinafter, embodiments of this invention will be described with reference to the drawings.

In the figure, la and lb are hollow reinforced concrete foundation piles that are commonly used, 1a is an upper pile that connects to each other, and 1b is a lower pile.

Metal seat plates 2a, 2 are attached to the end faces of each of these piles 1a, lb.
b, and the ends of each pile 1a, 1b are covered with reinforcing bands 3a, 3b over a required length.

The end faces of the upper pile 1a and the lower pile 1b are joined as shown in the figure, and the joined outer peripheries of the respective seat plates 2a and 2b are usually fixed to each other by welding 4 in the field.

A metal ring 5 is attached by welding 6 to the lower outer peripheral surface of the reinforcing band 3b of the lower pile 1b.

Further, the outer peripheral surface of the joint portion where the seat plates 2a, 2b are joined is coated with waterproof tape 7 which can prevent moisture from entering the joint portion over a width sufficiently wider than the thickness of both seat plates 2a, 2b. do.

This waterproof tape layer 7 may be formed by wrapping a tape coated with an adhesive on one side, or may be formed by fitting a heat-shrinkable tube and attaching it by heat-shrinking. Furthermore, it may be formed by applying a thick layer of waterproof paint.

The outer peripheral surface of the waterproof tape layer 7 is further covered with a protective band 8, and the lower end of the protective band 8 is fixed to the metal ring 5 of the lower stake 1b by welding 9 all or part of the circumference. let

In addition, in order to cover the waterproof tape layer 7, the upper and lower stakes 1
This can be done after welding 4 in a and 1 b, but in order to cover the protective band 8, fit the protective band 8 formed into an annular shape in advance from the head of the upper pile 1a and pull it down to the joint part. The lower end is brought into contact with the ring 5 and welded 9, or
Alternatively, the protective band 8 formed in a belt shape may be wound around the waterproof tape layer 7 and the edges welded together, and the lower end of the protective band 8 may be welded to the ring 5.

As explained above, this invention covers the outer circumferential surface of the joint that connects the upper and lower piles with a layer of waterproof tape.
There is no risk of corrosion of the metal in the joints, which require particularly strong strength, and since the waterproof tape layer is protected by a protective band, it is sufficient to prevent the pile from being damaged by friction with the ground when it is sunk. Provides excellent anti-corrosion effect.

In addition, since the protective band is simply placed over the waterproof tape layer and fixed to the pre-installed ring by welding, work on site can be done easily and quickly, and the anti-corrosion treated part is strong and durable throughout. In addition to having excellent properties, the pile does not form large protrusions on the outer surface of the pile, so it has many excellent effects, such as not increasing the driving resistance when sinking the pile.

[Brief explanation of drawings]

The drawing is a partially cutaway longitudinal sectional front view of a pile joint structure showing an embodiment of this invention. 1a...Upper stake, 1b...Lower stake, 2
a, 2b... Seat plate, 3a, 3b... Reinforcement band, 5... Ring, 7... Waterproof tape layer, End... protective band.

Claims (1)

[Scope of utility model registration request] A metal ring is fixed to the outer circumferential surface of the reinforcing band of the lower pile,
The upper pile and the lower pile are connected to each other at their seat plate portions by welding, and the outer peripheral surface of this connected joint portion is covered with a wide waterproof tape layer, and the outer peripheral surface of this waterproof tape layer is further covered with: A foundation pile joint structure consisting of the ring covered by a protective band whose lower end is fixed.