JPH07238543A - Execution method of wide flange beam pile - Google Patents

Abstract

PURPOSE:To execute the driving of a wide flange beam pile efficiently and to reduce working hours. CONSTITUTION:A rotary drive 3 is provided to the front of a machine body 2 of a rotary pile driver 1, and a expansion leader 4 is provided to the rotary drive 3. A universal bearing 7 is provided to the upper part of the expansion leader 4, and a wide flange beam 9 is vertically provided to the universal bearing 7 through a rotary chuck 8 and, at the same time, the wide flange beam 9 is inserted in the rotary drive 3 to place the wide flange beam 9 in a turnable manner. A water swivel 11 is provided near to the universal bearing 7, and slurry hoses 12 and 12 are vertically provided to the inside of the wide flange 9 beam from the upper part thereof through the water swivel 11 and are connected to a slurry discharge port 13 provided to the lower end of the wide flange beam 9. In the case pile circumference fixed liquid 14 such as cement milk, etc., is poured while revolving the wide flange beam 9 with the rotary drive 3, the front end of the wide flange beam 9 excavates the ground G together with the pile circumference fixed liquid 14 efficiently, so that the wide flange beam 9 is monolithically formed with the ground G in the case the pile circumference fixed liquid 14 is solidified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an H steel pile construction method, and more particularly to an H steel pile construction method with a reduced working time.

[0002]

2. Description of the Related Art A conventional method for constructing an H steel pile of this kind is to excavate the ground to a predetermined depth with an excavator such as an auger using a rotary pile driver, etc. While pulling up, inject the pile circumference fixing liquid such as cement milk into the hole,
The drilling tool is pulled up from the drilled hole. Next, there is known a construction method in which an appropriate number of H steel piles are inserted into the drilled holes, the H steel piles are connected to each other, and the pile circumference fixing liquid is hardened to be integrated with the ground. .

[0003]

In the conventional method for constructing the H steel pile, the work efficiency is high because the H steel pile is inserted by pulling the drilling tool from the drilling hole after forming the drilling hole with the drilling tool. bad. For example, when the height of the H steel pile construction site is limited, the leader of the rotary pile driver cannot be extended to a high place, and therefore it takes a lot of time to excavate the ground and insert the H steel pile. For this reason, it is required to shorten the construction time especially at the site where the working time is limited.

Therefore, there is a technical problem to be solved in order to efficiently carry out the pile driving of the H steel pile and reduce the working time, and the present invention aims to solve the problem. And

[0005]

DISCLOSURE OF THE INVENTION The present invention has been proposed in order to achieve the above-mentioned object, and a rotary drive device is arranged below an extendable leader of a rotary pile driver, and the rotary drive device is provided. H steel is vertically inserted into the above, a rotary chuck is provided at the upper end of the H steel, and the rotary chuck is fixedly attached to a universal bearing arranged at the upper end of the telescopic leader, and water is provided near the universal bearing. A swivel is provided, and a slurry hose is hung from the upper part of the H steel to the inner surface of the H steel via the water swivel, and the slurry hose is connected to a slurry discharge port provided at the lower end of the H steel to form a slurry or the like. The method for constructing an H steel pile in which the pile circumference fixing liquid is discharged, the H steel is rotated by the rotary drive device to excavate the ground, and the pile circumference fixing liquid is hardened to be integrated with the ground. , And the lower end of the H steel Drilling blades arranged to, 該掘 Kezutsubasa is formed from opposite pairs of blades on the left and right of the hollow cylindrical rod and the rod, open a slurry discharge opening at its tip,
The rod was fixed to the H steel with a fixture, and the pile circumference fixing liquid was sprayed from the slurry discharge port, and the excavation blade was rotated to excavate the ground with the rotation of the H steel. H
It provides a construction method for steel piles.

[0006]

According to the first aspect of the present invention, the upper end portion of the H steel is supported by the rotary chuck, and when the rotary drive device inserted through the H steel is driven, the H steel is driven at a low speed and a high torque. Is rotated. A slurry hose is provided on the inner surface of the H steel and is connected to the discharge port at the lower end of the H steel, so that a pile circumference fixing liquid such as cement milk is injected into the telescopic leader. When H is lowered, the H steel rotates and digs into the ground. The H steel is integrated with the ground by hardening the pile circumference fixing liquid.

According to a second aspect of the present invention, an excavation blade is provided at a lower end portion of the H steel, and the excavation blade is rotated by rotating the H steel. Thus, the excavation blade efficiently excavates the ground, the excavated soil and the pile circumference fixing liquid are well agitated, and the H steel is sequentially inserted into the drilled hole,
In addition, the H steel pile is constructed in combination with the hardening of the pile circumference fixing liquid.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to FIGS. 1 to 4 show the order of construction of the present invention. FIG. 1 shows a state before excavation. In FIG. 1, a body 2 of a one-pillar, one-legged leader rotary pile driver 1 is arranged on the ground G. A rotary drive device 3 is provided at the front of the machine body 2, and a lower part of a telescopic reader 4 is attached to the rotary drive device 3. A leader supporting device 5 is provided on the upper part of the first stage of the telescopic leader 4, and the telescopic leader 4 is supported by a telescopic stay 6 so as to be rotatable and tiltable. Further, a universal bearing 7 is provided on the uppermost stage of the telescopic leader 4, and H steel 9 is suspended from the universal bearing 7 via a rotary chuck 8. The H steel 9 is H-shaped in cross section and has the same side length, for example, one side is about 400 mm and its length is about 5 m. The H steel 9 has an upper end rotatably disposed by the rotary chuck 8 and the universal bearing 7, penetrates the rotary drive device 3, and has a lower end opened a drilling hole 10 in the ground G. Close to the hole position.

Further, a water swivel 11 is provided in the vicinity of the universal bearing 7 provided on the upper part of the telescopic leader 4, and the water swivel 11 is connected to the slurry hoses 12 and 12, and the upper port is a slurry supply device ( (Not shown), the lower port is attached to the inner side of the H steel 9, and the tip end thereof is connected to the slurry discharge port 13 provided at the lower end of the H steel 9.

Then, while the H steel 9 is rotated at a low speed of about 20 times / minute and a high torque of 2500 kg / m by the rotary drive device 3, the telescopic leader 4 is lowered. When the pile circumference fixing liquid such as cement milk is sent out from the slurry supply device, the H steel 9 discharges from the slurry discharge port 13 provided at the tip of the H steel 9 and the pile circumference fixing liquid 14 and the self weight of the H steel 9. And the ground G is excavated by the rotation force and the drilled hole 10 is formed.

As shown in FIG. 2, when the H steel digs into the ground and the telescopic leader 4 is lowered to the lowest point, the rotary drive device 3 is stopped and the upper end of the H steel 9 is stopped. The rotary chuck 8 provided in the section is removed from the universal bearing 7.
Further, the slurry hose 12 is attached to the water swivel 1
Remove from 1. The H steel 1 to be connected to the H steel 9
5 is provided with a rotary chuck 8 at the upper end portion thereof, which is connected to the universal bearing 7 to extend the telescopic leader 4,
Raise Steel 15.

As shown in FIG. 3, the lower end of the H steel 15 is joined to the upper end of the H steel 9, and the connecting plate 16,
16 ... are arranged so as to be sandwiched between the connection surfaces of the H steel 9 and the H steel 15, respectively, and the H steels 9 and 15 are connected by bolts or the like.
Connect between. Furthermore, a slurry hose 12 is attached to the inside of the H steel 15 from the water swivel 11,
The end of the slurry hose 12 is connected to the end of the slurry hose opened at the upper end of the H steel 9. Then, the rotation drive device 3 is operated to operate the H steel 9 and the H steel 1.
When 5 is rotated and the pile circumference fixing liquid 14 is delivered, the connected H steels 9 and 15 dig the ground G again as shown in FIG.

Then, by repeating the above-mentioned construction, the H steels 9 and 15 are dug to a predetermined depth, and the pile circumference fixing liquid 14 discharged at the time of construction is hardened, and the H steels 9 and 1 are made.
5 is integrated with the ground G. And FIG. 5 has shown the state which provided the excavation blade at the lower end part of the said H steel 9 used by the construction method mentioned above. In the figure, reference numeral 17 indicates an excavation blade, and a mounting tool 18 is provided at the lower end of the H steel 9, and the mounting tool 18 holds a rod 19 and hangs down. The rod 19 includes a plurality of pairs of wings 20a, 20b, 20a, 2 facing each other on the left and right.
0b ... Are provided, the rod 19 is provided with a slurry flow hole (not shown), and the slurry flow hole is provided to the slurry discharge port 21 provided at the lower end portion.

The excavation blade 17 is provided at the lower end portion of the H steel at the head of the excavation to the ground G, and the slurry hose 12 provided from the water swivel 11 is connected to the slurry circulation hole of the excavation blade 17. Then, as described in detail with reference to FIG. 1, when the H steel 9 is rotated while discharging the pile circumference fixing liquid 14, the blades 20a, 20b, 20a, 20 of the excavating blade 17 are rotated.
b ... Form the drilling hole 10 by mixing and stirring the pile circumference fixing liquid 14 discharged from the slurry discharge port 21 and the excavated soil.

Thus, by rotating the H steel 9 and discharging the pile circumference fixing liquid 14, the H steel 9 excavates the ground G, so that the H steel 9 hardens the pile circumference fixing liquid 14. H steel pile is constructed by being integrated with the ground. The excavation blade can also serve as a stirring blade, and as shown in FIG. 6, the excavation blade 17a may be formed by cutting out the lower end of the H steel 9 at the lower end instead of the excavation blade. it can. However, the excavation blade is
It can also be formed by notching the lower end of the steel 9 in the vertical direction.

The present invention can be modified in various ways without departing from the spirit of the present invention, and it goes without saying that the present invention covers the modifications.

[0017]

As described in detail in the above one embodiment, the invention according to claim 1 excavates the ground by adding H steel, and at the same time, piles of cement milk or the like from the tip of the H steel. The H-steel is buried in the ground by injecting the peripheral fixative. For this reason, compared with the conventional construction method in which H steel was connected and inserted into the hole drilled with an excavator such as an auger, and then the pile circumference fixing liquid was injected and fixed to the ground. Thus, the construction method of the present invention can improve work efficiency and shorten work time.

According to the second aspect of the present invention, since the excavation blade is provided at the tip of the H steel, excavation of the ground and stirring of the excavated soil are facilitated, so that the working time can be short-circuited. Thus, the H steel pile construction method of the present invention can improve work efficiency even at a site where there is a height restriction such as a raceway surface, and can shorten the work time. It is an invention that produces the effect of.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a state before excavation, showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a first stage excavation state.

FIG. 3 is an explanatory diagram showing a second stage excavation state.

FIG. 4 is an explanatory diagram showing a third stage of excavation.

FIG. 5 is an explanatory view of the excavation blade portion.

FIG. 6 is an explanatory view showing a modified example of the excavation blade portion.

[Explanation of symbols]

 1 1 column 1 leg type leader rotary pile driving machine 2 machine body 3 rotary drive device 4 telescopic leader 7 universal bearing 8 rotary chuck 9,15 H steel 11 water swivel 12 slurry hose 13,21 slurry discharge port 14 pile circumference fixing liquid 17, 17a Excavation wing 18 Fixture 19 Rod 20a, 20b Wing G Ground

Claims (2)

[Claims] 1. A rotary drive unit is disposed under a telescopic leader of a rotary pile driving machine, H steel is vertically inserted through the rotary drive unit, and a rotary chuck is provided at an upper end portion of the H steel. , The rotary chuck is fixed to a universal bearing arranged at the upper end of the telescopic leader, a water swivel is provided in the vicinity of the universal bearing, and a slurry hose is connected from the upper part of the H steel to the upper part of the H steel through the water swivel. While vertically hung on the inner side surface, the slurry hose is connected to a slurry discharge port provided at the lower end of H steel to discharge a pile circumference fixing liquid such as cement milk, and the H steel is rotated by the rotation drive device. A method for constructing an H steel pile, characterized in that the ground is dug forward, and the pile fixing liquid is hardened to be integrated with the ground. 2. An excavation blade is arranged at the lower end of the H steel, and the excavation blade is composed of a hollow cylindrical rod and a plurality of pairs of blades opposed to the left and right of the rod, and a slurry is provided at the tip thereof. The discharge port is opened, the rod is fixed to the H steel with a fixture, and the pile circumference fixing liquid is sprayed from the slurry discharge port. As the H steel rotates, the excavation blade is rotated to rotate the ground. The method for constructing an H steel pile according to claim 1, wherein the H steel pile is excavated.