JPH0444643B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an earth retaining wall for preventing the surrounding ground from collapsing and for water stoppage when the ground is deeply excavated.

(Conventional technology) The conventional method for constructing earth retaining walls is to drive main piles along the line of the earth retaining wall, and to insert horizontal sheet piles between the main piles at the same time as excavation. There was the sheet pile method, or the steel sheet pile method in which the sheet piles were driven along the retaining line.

(Problems to be solved by the invention) Earth retaining walls obtained by the parent pile horizontal sheet pile method do not have water-stopping ability, and steel piles with grip parts used for earth retaining walls using the steel sheet pile method cannot completely stop water. However, the strength of U-shaped steel sheet piles and straight steel sheet piles was low. For this reason, H-shaped steel sheet piles with excellent strength were used, but even these piles were unable to completely stop the water in the grip area.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention forms a closed space between consecutively driven piles, and bends the bent portions of the piles. It is characterized by a structure in which a plurality of communication parts are formed by bending and communicate with the closed space, and the communicated spaces are filled with concrete.

(Function) A closed space formed by consecutively driven piles is communicated with each other through a communication part created by bending the bent part of the pile, and the concrete filled in the closed space is connected to this communication part. The piles are joined together to form a continuous body, and then concrete adheres to the bends of the piles, making the concrete and piles one piece.

The earth retaining wall formed in this manner has greater rigidity and improved water-stopping ability compared to an earth retaining wall that is simply a series of connected piles.

(Example) Next, an example of the present invention will be described in detail with reference to the accompanying drawings. In the figure, Fig. 1 is a partial cross-sectional perspective view of an H-section steel pile with a bent portion formed on the web surface, Fig. 2 is a horizontal sectional view of a connected H-section steel pile, and Fig. 3 is the same as that of Fig. 2. −
4a is a sectional view taken along the line -- of FIG. 2.

The H-shaped steel pile 2 as a pile constituting the earth retaining wall 1 has flanges 3, 3 facing each other, and a web 4 connecting them, which are integrally formed, and a female part 5a of the grip 5, 5a, and male portions 5b, 5b on the other side, and the web 4 is formed with a number of communicating portions 8 consisting of vertically rectangular through holes 6 and bent portions 7.

The through hole 6 and the bent part 7 of the communication part 8 are formed by cutting three sides of a square U-shape with gas, for example, and then bending the square part at a right angle using the remaining one side as a fulcrum. The bent portions 7 are arranged in two rows on one H-shaped steel pile 2, and are bent in opposite directions at each step. The bending portion 7 can be bent not only upward but also downward.

This bent portion 7 can be formed by using a hydraulic cylinder or the like as appropriate, but in the method shown in FIG. By coming into contact with the bending parts 7, 7 and extending the rods 21, 21, the bending parts 7, 7 are bent outward, and the through holes 6, 6 are sequentially formed from below. At this time, the cylinder 20
The fixing cylinder 22 may be supported on a steel pile in order to stabilize it.

In another example shown in FIG. 4c, a pressing rod 25,
25 are formed into a pantograph shape, and when the rod 24 is contracted, the pressing rods 25, 25... are expanded in the lateral direction, and the expanded portions 7, 7 are bent outward.

Still other examples are shown in FIGS. 4d and 4e. In this example, a fixing plate 46 is provided via a support 45 at the lower part of a fixing fluid pressure cylinder 30 suspended from above. There are pins 46 on both sides of the fixed plate 46.
L-shaped pressing rods 41, 41 are rotatably attached by a, 46a.

On the other hand, one end of the bending cylinder 40 and the piston rod 40a are connected by pins 42a, 42a to the tips of the mounting pieces 42, 42 fixed to the pressing rods 41, 41.
Attach the end so that it can rotate freely.

During operation, the rod 3 of the fixing cylinder 30
1 is stretched and pressed against the web 4 to fix it. Thereafter, the rod 40a of the cylinder 40 is extended, and the pressing rods 41, 41 are rotated upward around the pin 46a, and the bending portion 7 is bent at the tip of the pressing rod 41 (the fourth
(see figure e).

The bent portions 7 are not limited to right angles, but may be bent at any angle, and the number of bent portions may be one or more. In addition, the surface shape of the bent portion 7 can be arbitrarily selected in consideration of adhesion of concrete.

Next, an example of a method for constructing the retaining wall 1 using the H-shaped steel piles 2 having the above configuration will be explained. First, an H-shaped steel pile 2 with a bent portion 7 formed on the web 4 is continuously driven into the ground with the grips 5, 5 connected to each other, and then the mud inside is completely removed, and then the By the method described above, the bent portion 7 is bent, a number of communication portions 8 are formed in the web 4, and concrete 9 is poured and filled.

In this way, the earth retaining wall 1 is formed by joining the filled concrete 9 through the numerous through holes 6 formed in the web 4 to form a continuous body, and furthermore, the concrete 9 adheres to the bent portion 7 of the web 4, resulting in an H Shaped steel pile 2,2
The concrete 9 and H-shaped steel piles 2 and 2 are fixed together.
are integrated, the rigidity increases, the bending strength increases, and the water stopping ability improves.

The above-mentioned earth retaining wall 1 is constructed by pouring the outside along the site boundary 12 and excavating the inside to use it as an earth retaining wall, as shown in FIG. It is also possible to use it as a part. The earth retaining wall 1 and the underground structure 11 can be easily connected to reinforcing bars or steel materials such as beams of the underground structure 11 because the H-shaped steel piles 2 are made of steel. As shown in FIG. 5, the earth retaining wall 1 can be made into a self-supporting earth retaining wall without using shoring by ensuring a predetermined root penetration length L from the root cut 13.

Further, as shown in FIG. 6, the H-beam steel pile 2 can be partially driven deeply to reach the supporting ground 13, so that it can also be used as a supporting pile.

(Effects of the Invention) As explained above, the present invention communicates the closed spaces formed between the piles through the communication portions, and fills the communicated spaces with concrete to form the earth retaining wall. It is possible to construct an earth retaining wall with large water retention capacity and excellent water-stopping ability.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a partial cross-sectional perspective view of an H-beam steel pile with a bent portion formed on the web surface, and FIG. 2 is a horizontal cross-sectional view of a connected H-beam steel pile. , Fig. 3 is a cross-sectional view taken along the - line in Fig. 2, Fig. 4 a
are sectional views taken along the - line in Fig. 2, Fig. 4 b, c, d,
e is an explanatory diagram showing another example of the method of forming the bent portion, 5th
The figure is a sectional view of an earth retaining wall used for the building structure, and Figure 6 is an elevational view of the earth retaining wall partly used as support piles. 1... Retaining wall, 2... H-shaped steel pile, 5... Grip, 6... Through hole, 7... Bent part, 8... Communication part.

Claims (1)

[Claims] 1. A closed space is formed between the piles by successively driving piles with bent portions formed on the surface,
An earth retaining wall in which a plurality of communication parts are formed by bending bent parts formed on the pile to communicate the closed space, and the connected closed spaces are filled with concrete. 2. The pile has flanges at both ends of the web.
The earth retaining wall according to claim 1, characterized in that the earth retaining wall is constituted by shaped steel piles, and the closed space is formed by driving webs of the H-shaped steel piles in a continuous manner.