JPS5858327A - Driving of underground pile - Google Patents

Abstract

PURPOSE:To raise the operability and reliability of driving underground piles by a method in which a main pile and a temporary pile are connected with a connection plate and bolts at an interval, the bolts are cut off by striking, and the temporary pile is easily recovered. CONSTITUTION:When a sheathing pile is needed for the portion at a depth or more, a connecting plate 3 is welded to an upper temporary pile 1 to be recovered, and a main pile 2 is connected to the connecting plate 3 with a bolt 4 with a spacing L in relation to the temporary pile 1. They are erected into an excavated pit, the upper part of the temporary pile 1 is struck to cut off the bolt 4, and the temporary pile 1 is recovered.

Description

[Detailed description of the invention] The present invention relates to a method for driving underground piles.

Earth retaining piles are driven into the box from the ground, but underground piles (premium piles), which are installed only around underground structures, are not required between the top of the structure and the ground.

However, since it is not possible to suddenly place only the piles deep underground, the following methods have been used in the past, but each method has its own drawbacks.

<1> A method in which after the excavation of the earth removal area is completed, the earth is driven into the excavated premises.

However, in the case of this method, it is necessary to carry various machines into and out of the premises just for pouring on the premises, and in addition, workers who are engaged in the pouring work are also required.

As a result, there are disadvantages such as losses in the work process, lengthening of the construction period, and high monthly driving costs.

〈2〉 First, from CiL, drive the earth retaining pile and the yard pile of the same length as the earth retaining pile, and then cut the unnecessary yard piles one by one in parallel.

In the case of this method (/C), the exposed portion of the pile had disadvantages such as lowering the efficiency of excavation work and increasing cutting costs.

There are also other types of on-site piles that connect two piles using a joint device W that uses wire or magnets.
Both had problems with -11 yen 4 performance and reliability.

The present invention was made in response to the above-mentioned problems, and aims to provide a method for driving underground piles that can improve work efficiency, reduce work costs, and ensure accurate driving. do.

Next, an example will be described.

(1) Piles within the premises (Fig. 1) The in-plant pile of the present invention is composed of a temporary pile (1) and a real pile (2).

Temporary t(1) is, for example, a type IIH steel with a horizontal surface (1
1) Form.

This pile (2) is made of, for example, H-shaped steel, and has a horizontal surface (21
) to form.

And below the horizontal plane (21)? Open multiple route holes (6).

The temporary pile (]) is a pile that is needed only for a short period of time when the driving of the main pile (2) is completed, whereas the main pile (2) is located in the ground for a long period of time after driving, and is under load. This is a pile that serves as a support and other functions.

Then, the temporary pile (1) and the main pile (2) are arranged on the same axis with the temporary pile (1) on top and the main pile (2) on the bottom. They are connected by a connecting plate (3) to form a yard pile.

(2) The connecting plate (3) is an iron plate piece formed with a plate width slightly narrower than the plate width of the I (shaped steel) that forms both sides (1) and (2), and has bolt holes (5) at the bottom. do.

The upper part of this connecting plate (3) is welded to the lower end of the temporary pile (1).

The welding points are, for example, the outer surface of the flange of the F (shaped steel) and both sides of the rib, and the lower half of the connecting plate (3) is made to protrude beyond the lower end of the temporary pile (1).

In order to connect the two mains (1) and (2) with the connecting plate (3), both delts (4) are passed through and fixed.

As will be described later, this bolt (4) has a diameter and strength enough to be sheared by the impact of driving the pile.

Next, we will explain the work of driving in-plant piles.

(1) Drill an auger hole (7) at the planned depth using a drilling machine in advance. (No. 31ml) Auger hole (7)
The hole is drilled to a diameter that allows easy entry.

The drilling depth is (the length of temporary pile (1) and the length of ten piles (2))
Set 1.0 Om to 2.0 (] +1Ql) shorter.

(2) Erecting piles In advance, connect temporary piles (1) and regular piles (2) with connecting plates (3) as described above to form on-site piles.

This on-site pile is lifted up by a crane or the like and placed into the auger hole (7).

(3) Driving (Figure 4) Drive the upper end of the temporary pile (1), which protrudes a driving distance QO above the ground, into the striking device of Monkekuhiro.

Then, since the main pile (2) and the connecting plate (3) are connected only with bolts (4), 71? This causes a shear in the bolt (4), and the connection between the connection -5~4- 3) and the main pile (2) is released.

As a result, the horizontal plane (11) (21) of Ryoto (1) (2)
are in direct contact and the main pile (2) receives the impact force on the axis and is driven into the ground by a distance of 11.

(4) Removal of temporary piles. Excavation (Fig. 5 1) After driving the scheduled number of piles, pull out the group of temporary piles (1) that will be used for pile extraction.

Since the bolts (4) have been cut, the main pile (2) group will remain in the planned position underground, and only the temporary pile (1) group will be removed.

The premises are then excavated by conventional VC methods.

As described above, the following effects can be expected from the present invention.

<B> Since the yard pile of the present invention can be driven from the ground, there is no need to carry it in and out like driving it into the yard, improving work efficiency.

<Exposure> There is no need to cut the piles one after another at the same time as the excavation of the premises, and the actual pile, which is an M double pile, can be formed by pulling out the temporary pile, which is economical.

〈〈〉) Interpose a certain interval (■・) between the upper pile and the lower branch (~, since only one stake is temporarily fixed with connection g7 and both branches are connected, the division of the upper pile and lower branch will be separated when driving. It is easy and the impact force can be transmitted coaxially.

(Now) Attaching the connecting plate is a simple task, and sufficient connecting force can be obtained when screwing in.

(g) Since the upper pile is located inside the auger hole, a relatively low-capacity extractor can be used once a month to pull out the pile.

4.1g 1 side of 1111 nests, between Figure 1: Perspective view of the joint part before impact. Figure 2: Perspective view of the joint part after being rammed, 3rd do 41 to 5: Explanatory diagram of construction order.

1: Temporary pile, 2: Main pile, 3:) 1 hardboard, 4 near bolt.

Patent applicant: Taisei Corporation Agent Patent Attorney Yamaguchi Saku = 7 = Figure 1

Claims (1)

[Claims] A connecting plate is welded and fixed to the lower part of the temporary pile, the connecting plate and the upper part of the actual pile are fixed with bolts, the lower end of the temporary pile and the upper end of the actual pile are positioned with a certain distance between them, and the auger The temporary pile and the main pile are hung together in one hole, the upper end of the temporary pile is struck to break the bolt, the lower end of the temporary pile and the upper end of the main pile are brought into contact, and the entire blow is transmitted to the lower end of the main pile. An underground pile driving method characterized by driving the main pile into the bottom of the auger hole and pulling up the temporary pile.