JPH068532B2 - Pile driving method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a pile driving method, and more particularly to improvement of a method for driving a long pile on a hard ground.

<< Prior Art >> When driving piles such as H-type steel, I-type steel, steel sheet pile or steel pipe piles into the ground, a vibrating hammer driving machine such as a vibro hammer is generally used. This vibrating pile driver is hung from a crane and adheres to the end of the pile to give vibration, which causes the tip of the pile to penetrate into the ground.

<Problems to be solved by the invention> However, in the conventional pile driving method, the piles are driven at once by the vibrating pile driving machine. In addition, when the ground is hard, the pile tends to bend due to driving resistance, and such bending causes a problem that the inclination of the pile becomes larger.

The present invention has been devised to effectively solve the above-mentioned problems, and the purpose thereof is a pile driving method capable of vertically driving a relatively long pile vertically even on hard ground. To provide.

<< Means for Solving the Problems >> In order to solve the above problems, the present invention provides first, second, third ... Nth main piles each having a groove and an engaging portion that form a joint,
A step of preparing to prepare three first, second, and third dummy piles having the groove and the engaging portion and having the same cross-sectional shape as the main pile and a shorter length than the main pile; Insert the first main pile into the vertical hole after pulling out the second dummy pile on the inner side, and the first step of placing the first, second, and third dummy piles continuously in one row. A second step in which both sides thereof are driven while being guided by the first and third dummy piles; and a third step in which the second dummy pile is driven adjacent to the outside of the third dummy pile. A fourth step of inserting the second main pile into the vertical hole after pulling out the third dummy pile and placing the second main pile while guiding both sides thereof with the first main pile and the second dummy pile, The second to fourth steps for the second and third dummy piles are repeated, and the fifth step of sequentially placing the third ...... nth main pile while guiding the dummy piles with the dummy piles is provided. For the joint Ri is obtained so as to be performed.

<Operation> In the pile driving method configured as described above, since both sides of the main pile to be driven are guided by the dummy piles or other main piles, the main pile is unlikely to incline, and after the dummy pile is pulled out, Since the main pile is inserted into the vertical hole and driven, even when the main pile is relatively long, the driving resistance is small, and therefore, the long main pile can be vertically driven even on the hard ground.

<< Example >> An example of the present invention will be described below with reference to the drawings. As shown in FIG. 1 (A), the pile driving method of the present invention uses three dummy piles 1 to 3 having the same length. The length of these dummy piles 1 to 3 is shorter than the length of the main pile,
For example, as shown in FIG. 1 (C), the length of the dummy piles 1 to 3 is about half the length of the main piles 4 and 5. Dummy pile 1 ~
3 and the main pile 4 are made of H-section steel having the same cross section, and a pair of angle members 5 are provided on one side surface of the dummy piles 1 to 3 (the same applies to the main pile 4) as shown in FIG. Grooves 7 are formed so as to face each other along the direction, and an engaging portion 8 having a T-shaped cross section that engages with the groove 7 is provided on the opposite side surface. The groove 7 and the engaging portion 8 form a joint 9.

Next, a method of placing the main piles 4 and 5 will be described step by step. First, as shown in FIG. 1 (A), three dummy piles 1 to 3 are installed on the ground 1
0 is continuously cast in a line. A vibrating pile driving machine such as a vibro hammer 11 shown in FIG. 3 is used for this driving.
That is, the ends of the dummy piles 1 to 3 are connected to the vibro hammer 11
When the vibro hammer 11 is gradually lowered by operating the crane 12 while vibrating the vibro hammer 11, the vibrating hammers 11 vibrate to cause the dummy piles 1 to 3 to fall.
The tip of is penetrated into the ground 10. Dummy pile 1
When placing 3 to 3, the adjacent dummy piles are engaged with each other at the joint 9.

After the completion of placing the three dummy piles 1 to 3, the intermediate dummy pile 2 is pulled out while vibrating with the vibro hammer 11.
Then, as shown in FIGS. 1 (B) and (C), the main pile 4 is inserted into the vertical hole 13 formed after being pulled out, and is driven by the vibro hammer 12. At this time, the groove portions 7 and the engaging portions 8 on both sides of the main pile 4 are engaged with the engaging portions 8 and the groove portions 7 of the adjacent dummy piles 1 and 3. When placing the main pile 4, place both sides of the dummy pile 1,
Since 3 guides, the inclination of the main pile 4 can be prevented even when the main pile 4 is driven deep into the hard ground. Further, since the main pile 4 is inserted and inserted into the vertical hole 13 after the dummy pile 2 is pulled out, the driving resistance is reduced by the length of the vertical hole 13, and therefore the dummy piles 1 and 3 have a guiding function. Together with this, it is possible to effectively prevent the seat bending even when the long main pile 4 is driven into the hard ground.

After the main piles 4 have been placed, the dummy piles 2 that have been pulled out before that are placed next to the outside of the dummy piles 3 as shown in FIG. 1 (D), and then as shown in FIG. 1 (E). The dummy pile 3 is pulled out, another main pile 5 is inserted into the vertical hole 14 formed thereafter, and driven by the vibro hammer 11. The work at this time is almost the same as the driving of the main pile 4, except that one side surface of the main pile 5 is guided by the main pile 4 instead of the dummy pile. After placing the main piles 5, as shown in FIG. 1 (G), after placing the dummy piles 3 adjacent to the outside of the dummy piles 2, the dummy piles 2 are pulled out, and the same operation is repeated. And pile the main pile.

Although one embodiment of the present invention has been described above, the present invention can be variously modified in addition to the above embodiments. A pile having various cross-sections such as a sheet pile or a steel pipe pile may be used, and the joint 9 may have another structure.

<< Effects of the Invention >> As described above, according to the present invention, since both sides of the main pile are driven while being guided by the dummy piles or other main piles, it is possible to drive the main pile vertically without inclining it. Also, since the main pile is inserted and placed in the vertical hole after the dummy pile is pulled out, the driving resistance acting on the main pile can be reduced,
In combination with the guiding function of the dummy pile or the main pile, it is possible to prevent the bending of the seat even when the long main pile is driven into the hard ground.

[Brief description of drawings]

FIG. 1 is a process diagram of the method of the present invention, and FIG. 2 is a diagram of FIG.
II-II line sectional view, and FIG. 3 is a side view of a crane. 1-3 ... Dummy piles 4, 5 ... Main piles 11 ... Vibro hammers 13, 14 ... Vertical shafts

Claims (1)

[Claims] 1. A first pile, a second pile, a third pile, and an n-th main pile having a groove and an engaging portion that form a joint, and a cross-sectional shape of the main pile having the groove and the engaging portion. For preparing three first, second, and third dummy piles having the same length and a shorter length than the main pile, and a row of the first, second, and third dummy piles in a row. While inserting the first main pile into the vertical hole after pulling out the inner second dummy pile and guiding both sides of the first dummy pile by the first and third dummy piles. The second step of placing, the third step of placing the second dummy pile adjacent to the outside of the third dummy pile, and the second step in the vertical hole after pulling out the third dummy pile. Fourth step of inserting the main pile of No. 3 and placing both sides of the main pile while guiding it with the first main pile and the second dummy pile, and second to fourth steps relating to the second and third dummy piles. Repeat 3rd ... nth And a fifth step of sequentially pouring while guiding the pile in dummy pile, pile 設方 method the guide is characterized by being carried out by the joint.