JP2004278250A - Method for positioning concrete pile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for positioning a concrete pile by which the working ratio of a pile driver is improved and the term of work can be shortened while stable welding can be conducted. <P>SOLUTION: When the concrete pile is positioned, excavation work in which a drilled pit 3 is formed by using the pile driver 2 is conducted while a lower pile 11 is inserted into a temporary pit 20 previously formed at a place separate from the pile 3. Welding work in which an upper pile 12 transported by a crane 8 is extended to the lower pile 11 is conducted, and the extended concrete pile 10D is moved to a section immediately above the pit 3 by using the crane 8 and inserted into the pit 3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for installing a concrete pile, which is constructed by inserting at least two or more ready-made concrete piles into a drilled hole excavated in the ground.
[0002]
[Prior art]
Conventionally, as a method of embedding a ready-made concrete pile in the ground, for example, as shown in FIGS. 2A to 2D, the ground 1 is hardened by using a pile driver 2 such as an earth auger. After excavating to a depth reaching a certain support layer 1A, cement milk 4 is poured into the drilled hole 3, a ready-made concrete stake 10 is inserted and solidified. A cement milk method in which the periphery of the pile 10 is fixed and the concrete pile 10 is erected, or after the concrete pile 10 is inserted into the hole 3, a final blow is performed to further drive the concrete pile 10 into the ground 1. There is a method of expanding the tip with roots.
By the way, since the length of the concrete pile 10 is generally about 15 to 20 m due to transportation or the like, when the depth of the support layer 1A, that is, the depth of the hole 3 is large, a plurality of concrete piles 10 are required. It is necessary to build concrete piles by adding them. Specifically, as shown in FIG. 3A, first, the lower pile 11 is inserted into the drilled hole 3 excavated to a predetermined depth using the pile driving machine 2 so that the pile head comes out of the ground surface. To the heavy machine 6 such as a backhoe, holding the lower pile 11 with the wire 7 and the like, and attaching an upper pile 12 in place of the auger (screw portion) of the pile driver 2, and a lower end of the upper pile 12. The part is placed on the upper end of the lower pile 11. Then, the joint at the lower end of the upper pile 12 and the joint at the upper end of the lower pile 11 are welded, the upper pile 12 is added to the lower pile 11, and the drilling is performed while rotating the added concrete pile. Insert into 3 and build.
[0003]
[Problems to be solved by the invention]
However, in the above-mentioned conventional method, since the pile driver 2 is used for adding the lower pile 11 and the upper pile 12, there is a problem that the excavation operation cannot be performed during the welding operation. In addition, since the welding work is performed around the drilled hole 3 where the excavated earth and sand remains, not only the condition of the feet is poor, but also the holding of the lower pile 11 is unstable, so that stable work cannot be performed. The finish of welding was bad.
[0004]
The present invention has been made in view of the conventional problems, and it is possible to increase the operation rate of a pile driver, shorten the construction period, and provide a method for installing a concrete pile capable of performing stable welding. The purpose is to provide.
[0005]
[Means for Solving the Problems]
The invention according to claim 1 of the present invention relates to a concrete pile which is formed by excavating the ground to a predetermined depth, inserting at least two or more ready-made concrete piles into the excavated hole, and building the pile. A method of erection, in which a temporary hole is provided in advance, a lower pile is installed in the temporary hole, and an upper pile is added to an upper side of the pile. Characterized in that it is inserted into the hole by using another insertion means. Thus, since the pile driver only needs to perform the excavation work, it is possible to increase the operation rate of the pile driver and shorten the construction period. In addition, the lower pile can be stably held, and the feet for performing the welding operation are good, so that stable welding can be performed.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIGS. 1A and 1B are diagrams showing a method for installing a concrete pile according to the present embodiment. In this example, first, using a pile driver 2 such as an earth auger, the ground 1 is excavated to a depth reaching the support layer 1A, which is a hard ground, to perform a drilling operation for forming a drilled hole 3 and the drilling operation. The lower pile 11 is inserted into a temporary hole 20 provided in advance at a location away from the upper pile 3, and the upper pile 12 transported by a lifting machine 8 such as a phase number crawler crane is placed on the lower pile 11. Then, the joint at the lower end of the upper pile 12 and the joint at the upper end of the lower pile 11 are welded to add the upper pile 12 to the lower pile 11. At this time, the depth of the temporary hole 20 is set to such a depth that the pile head comes out of the ground surface when the lower pile 11 is inserted. A work floor 21 serving as a welding scaffold is installed around the temporary hole 20. Since most of the lower pile 11 is housed in the temporary hole 20, the support stability of the lower pile 11 is remarkably improved as compared with the conventional wire support. Furthermore, in this example, since the welding operation can be performed on the work floor 21 installed in a place where there is no obstacle such as excavated earth and sand, the welding operation can be performed stably, and the degree of finish of welding can be reduced. Can be improved.
After the excavation work is completed and the pile driver 2 moves to the next excavation site, the added concrete pile 10D is moved to a position directly above the borehole 3 by using the lifting machine 8, and the cement milk 4 is removed. It is inserted into the drilled hole 3.
When the concrete pile 10D is inserted, if the drilling machine 8 cannot be inserted to a predetermined depth due to collapse of a drilled wall or the like, the pile driver 2 is recalled, and the concrete pile 10D is attached. What is necessary is just to rotationally press-fit into the hole 3 while rotating the 10D.
[0007]
As described above, in the present embodiment, the excavation work for forming the drill hole 3 using the pile driving machine 2 is performed, and the lower pile 11 is inserted into the temporary hole 20 provided in advance in a place away from the drill hole 3. Is inserted into the lower pile 11, and a welding operation of adding the upper pile 12 transported by the lifting machine 8 is performed, and the added concrete pile 10D is subjected to the drilling 3 by using the lifting machine 8. Since the mortar is moved right above and is inserted into the drilled hole 3 into which the cement milk 4 has been injected, the operation rate of the pile driver 2 (time during excavation) can be greatly improved. In addition, since the lower pile 11 can be stably held by the provisional hole 20 and the foot is good near the provisional hole 20, stable welding can be performed in a short time. Therefore, it is possible to improve the finished degree of welding and the working time. Further, the lifting machine 8 has been conventionally used only for unloading concrete piles. However, the use of the lifting machine 8 at the time of building concrete piles can improve the operation rate. These improvements result in shortened construction periods and reduced costs.
[0008]
In the above-described embodiment, the method of embedding the concrete pile 10D using the cement milk method has been described.
The concrete pile to be built is not limited to the two piles of the lower pile 11 and the upper pile 12, but may be three or more. In this case, it is necessary to provide a plurality of temporary holes.
[0009]
【The invention's effect】
As described above, according to the present invention, when two or more ready-made concrete piles are erected, provisional holes are provided in advance, a lower pile is installed in the temporary holes, and After adding the pile on the upper side, the added concrete pile is inserted into the borehole using another insertion means such as a crane, so that the operation rate of the pile driver is improved, Can be shortened. In addition, the lower pile can be stably held and the step of performing the welding operation is good, so that stable welding can be performed in a short time.
[Brief description of the drawings]
FIG. 1 is a view showing a method for installing a concrete pile according to an embodiment of the present invention.
FIG. 2 is a diagram showing an outline of a conventional cement milk method.
FIG. 3 is a view showing a conventional method of installing a concrete pile.
[Explanation of symbols]
1 ground, 1A support layer, 2 pile driver, 3 drill hole, 4 cement milk,
8 lifting machine, 10D concrete pile, 11 lower pile, 12 upper pile, 20 temporary hole,
21 Work floor.

Claims (1)

Excavating the ground to a predetermined depth, in the method of embedding concrete piles to be inserted by inserting at least two or more ready-made concrete piles into the drilled hole, temporary holes are provided in advance, After placing the lower pile in the temporary hole and adding the upper pile to the upper side of the pile, the concrete pile thus added is inserted into the borehole. How to build.

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