JPS61221414A - Method and apparatus for fixing driven pile - Google Patents

Abstract

PURPOSE:To strongly fix a pile by a method in which an opening-and closing ring is hung down into an outer tube under a state that legs are closed, the ring is penetrated into the outer tube until the legs are extended from the window of the outer tube to the outside, and concrete is poured into the outer tube. CONSTITUTION:An opening and closing ring 7 is attached to the front end 13a of a lever 13 and integrated by thrusting a shear pin 12 through them. Legs 10 are hung down into an outer tube 1 driven under the ground and radially extended under the guidance of the guide plate 4 of the tube 1. The pin 12 is sheared by pushing force of the lever 13, the ring 7 is pressed down by the front end 13a of the lever 13, and the legs 10 are extended from the leg window 3 to the outside of the tube 1. The lever 13 is drawn out, and concrete is poured into the tube 1, whereupon the concrete flows out through the window 3, goes toward the region S along the legs 10, and hardens.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method and device for fixing driven piles, and is particularly applicable to driven piles driven into the seabed in the construction of offshore structures. The present invention relates to a method for fixing a driven pile and a device therefor, which exhibits superior effectiveness when applied to.

(Prior art) Conventional driven piles used in such cases have a pointed head at the front end and an outer pipe with a number of windows drilled in the curved surface to allow concrete to overflow to the outside of the pipe. After driving into the ground as a pile, mixed concrete is poured into the pipe from the opening at the rear end of the outer pipe, pressurized, and the concrete spills out of the pipe through the window, and the overflowing concrete solidifies underground. This strengthens and maintains the bond between the driven pile and the surrounding land.

However, with this method, even if the concrete injected into the outer pipe is pressurized, the distance that the concrete overflows into the ground outside the pipe and permeates is extremely short, resulting in poor cohesion between the driven pile and the surrounding land. Unfortunately, there was a considerable risk that the driven pile would wobble in the ground or come out.

(Object of the Invention) The present invention has been made in view of the drawbacks of the above-mentioned prior art, and is similar to a tree with roots spread widely underground! The object of the present invention is to realize a driving pile fixing method and device capable of fixing an IK driven pile.

(Structure of the Invention) As a structure for achieving the above object, the present invention has a pointed head at the front end, and a plurality of swelling agent windows are bored near the pointed head along the circumference of a common circle. The installed outer pipe is driven into the ground, and an opening/closing ring with multiple legs pivoted to the lower end to freely open and close in the radial direction is suspended inside the outer pipe from the rear end opening of the outer pipe with the legs closed. Lower the opening and closing ring from above into the outer tube along the leg guide means provided inside the outer tube until the legs are stretched outward from the swelling agent window, and insert concrete into the outer tube from the rear end opening of the outer tube. The concrete flows out from the swelling window along the legs to the outside of the outer tube, solidifying and bonding the vicinity of the legs and the outer tube, or having a pointed head at the front end. an outer tube in which a plurality of swelling agent windows and leg guide means for guiding the legs corresponding to the portholes outward are provided along the circumference of a common circle; The swelling window is equipped with an opening/closing ring which is inserted into the outer pipe by pivoting the legs of the opening/closing ring in a radial direction so as to freely open and close. It is characterized by having a sufficient size to allow water to flow outside through the gap between the legs and the window.

(Example) Next, embodiments of the present invention will be described in detail with reference to the drawings.

In FIGS. 1, 2, and 3, l is an outer tube, which has a pointed head 2 at its front end, and a plurality of swelling agent windows 3 (Da in the example shown) are bored in the vicinity of the pointed head 2. . d is a guide plate which functions as a guide means for guiding the legs to the outside of the outer tube l. The window 3 and the guide plate DA each form a pair and are provided along the circumference of a common circle. In the example,
An example is shown in which the guide plate is formed by bending the tube wall toward the inside of the tube when the swelling agent window 3 is cut open. The outer tube l has a rear end opening j, so that the inner lumen t communicates with the outside through the swelling window 3 and the rear end opening j.

Is it an opening/closing ring and a pivot body? and a plurality of legs 1 each pivotally attached to the periphery by pinta so that they can be freely opened and closed in the radial direction.
0. The pivot body r has a fitting shaft // at the top, and a shear pin 12 is inserted into the fitting shaft /l.

Reference numeral 13 denotes a charging frame for pushing the opening/closing ring 7 into the front end of the outer tube l. 1 is a hole for inserting a shearing pin, and after fitting the fitting shaft // of the opening/closing ring 2 into the front end /Ja of the charging frame 13, the shearing pin 1- is inserted through the hole and the two are bound together. Due to the combination, the opening/closing ring and the charging frame 13 are integrated. As the shear pin 12, a thin and weak pin that is easily cut by the action of shear force is used.

The operation for fixing a driven pile in the ground with the above structure will be explained. The outer tube 1 is driven into the ground by applying impact force or pressing force from the side of the rear end opening S. Next, the opening/closing ring is attached to the front end 13a of the charging frame 13 in the above-described manner, and after integrating the two by inserting the shear pin l-, the whole is inserted into the outer tube l with the legs 10 hanging down. Suspend it from the rear end opening S. When the tips of the legs 10 come into contact with the guide plate provided near the front end of the outer tube, the legs io are guided by the guide plate and are stretched radially, and the subsequent charging frame /3
The shear pins 2 are sheared by the pushing force of
At the same time as it is extended to the outside of the outer tube 1, it is guided to the upper surface of the guide plate DA, and its included angle θ gradually increases. The state is shown in FIG. In the figure, as the loading frame 13 is lowered, the position of the opening/closing ring 7 gradually descends from a to finally reach e. During this time, the included angle of the leg 10 increases from θa to θe. That is, the movement area of the legs 10 during that time is the areas s and S shown by hatching, and the legs 10 dig underground in the areas s and S, and at least this area is protected from the bath. The poured concrete is in a state where it is extremely permeable.

At this time, the charging frame 13 is pulled out from the rear end opening j to the outside of the outer tube l. At this time, the front end /Ja of the charging frame 13 and the opening/closing ring 2
Since the shear pin 12 that was connecting the two has already been cut off, the opening/closing ring 7 and the leg 10 remain as they are and will not come up along with the cord.

Next, concrete is poured into the outer tube l through the rear end opening S, and if necessary, it is sealed and pressurized.

Since the size is such that there is sufficient clearance, the concrete passes through the swelling window 3 and follows the arrow IP as shown in Figure D.
It flows out in the direction of I and flows along leg io to the area ftca in Figure 5.
Penetrates towards S, outer tube l and leg 10 and 1fcHn1
The area near 0 is coagulated and bonded.

(Effect of the invention) Since the method and apparatus of the present invention are configured as described above,
When fixing a driven pile into the ground, it can be fixed extremely firmly, just like a tree with its roots spread out in the ground, and this has the excellent effect of preventing the driven pile from wobbling. can get.

[Brief explanation of drawings]

° Fig. 1 is a sectional view of one member used in the device of the present invention, Fig. 2 is a front view of other members used in the device of the present invention, and Fig. 3 is a sectional view of one member used in the device of the present invention.
The figure is a sectional view of still another member of the device of the present invention, FIG. 7 is an enlarged sectional view of a main part for explaining the function of the device of the present invention, and FIG. 5 is a drawing for explaining the function of the device of the present invention. It is. 100. Outer tube, Ko00. Pointed head, window for 3000 legs, da 0
0. Guide board, jlo, rear end entrance, 4,,, lumen,? 6
0. Opening/closing ring? 10. Axis body,? 00. pin, 1000
1 leg, /1. ,,fitting shaft,/J,,,shear pin,is.

Claims (2)

[Claims] (1) An outer pipe with a pointed head at the front end and multiple leg windows near the pointed head drilled along the circumference of a common circle is driven into the ground, and multiple legs are installed at the lower end. The opening/closing ring, which is pivoted to freely open and close in the radial direction, is suspended from the rear end opening of the outer tube into the outer tube with the legs closed, and the legs are moved along the leg guide means provided inside the outer tube. Push the opening/closing ring into the outer tube from above until it is stretched outward from the leg window, then pour concrete into the outer tube from the rear end opening of the outer tube so that the concrete flows from the leg window along the leg into the outer tube. A method for fixing a driven pile characterized by flowing out to the outside and coagulating the vicinity of the leg and the outer pipe. (2) The front end has a pointed head, and near the pointed head, a plurality of leg windows and leg guide means for guiding the legs corresponding to the windows outward are arranged in a common circle. It is equipped with an outer tube provided along the circumference, and an opening/closing ring which is inserted into the outer tube with a plurality of legs pivotally attached to the lower end to freely open and close in the radial direction, and the leg window is provided with the legs of the opening/closing ring. A device for fixing a driven pile, characterized in that the device has a sufficient size so that the concrete loaded in the outer tube can flow out through the gap between the leg and the window when the concrete is inserted through the window.