JPS5837224A - Method for constructing pile into ground - Google Patents

Abstract

PURPOSE:To enable to construct the pile having a required strength, by a method wherein an excavating shaft is caused to reach a given position as a pile is formed through mixing of excavated earth and sand and a solidifying agent, mixture earth is prepared by adding the solidifying agent such as cement to earth conveyed up to a ground, and an excavated hole is filled with the mixture earth by pressing out it through the excavating shaft. CONSTITUTION:The ground is excavated as an earth and sand solidifying agent 2 such as cement milk is jetted from the lower end of an excavating shaft 1, and simultaneously, an excavating work progresses as a primary mixture pile 4 is formed underground by mixing the excavated earth and sand and the earth and sand solidifying agent, and the lower end of the excavating shaft is cuased to reach a given position. Then, an earth and sand solidifying agent such as cement is added to a primary mixture earth 5, which is raised to a groud and is freed of conglomerate clay 6, for kneading to prepare a secondary mixture earth 7. Then, the excavating shaft is lifted as the inside of an excavated hole 8 is filled with the secondary mixture earth 7 in place of the earth and sand solidifying agent 2 through the lower end of the excavating shaft 1, and this causes a pile 9 to be built.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for constructing piles in the ground, and includes an excavation shaft (1).
The ground (3) is excavated while ejecting a soil consolidating agent such as Semeshito Sanluk from the lower end, and the excavated soil and the soil consolidating agent (2) are mixed and the soil is poured into the primary mixed pile 111. The first step is to excavate while forming the inside of the soil, and reach the lower end of m cutting shaft (1) at a predetermined position. , the second process of adding a soil consolidation agent such as fly ash to the required strength and raising the temperature to produce the second mixture ±(); and the second process of manufacturing the first mixture pile (4). Excavation axis (
After the lower end of 1) reaches the predetermined position and the hole is drilled, the earth and sand consolidation agent (2) K in the 1st process is added from the lower end of the excavation shaft (1) to the secondary mixture ± (7) produced in the 2nd process. While pressing out and filling the drilling hole (8), the drilling shaft (1) is pulled up and 4! J secondary mixture ± (7) is filled and the tiger pile (9
) This relates to a method for constructing piles in the ground, which is characterized by the $3 process for forming piles.

Conventional construction methods for building piles in the ground include, for example,
A construction method disclosed in Japanese Patent No. 50543 is known. In this conventional example, t) I cytomilk was simply squirted out without excavating the ground, and this was mixed at the same time as the excavation to form the pile. Due to this slick, it was impossible to form a pile with uniform strength in the vertical direction, no matter how much the mixture was mixed underground. In addition, in this conventional example, since it is mixed with the excavated soil in the borehole, if the concentration of cemcytomilk is high, the fluidity is low, which causes problems in mixing with the excavated soil in the borehole. As a result, the amount of t-meshito used was small, and the strength of the piles formed was weak. Furthermore, as another conventional example, all the excavated soil is discharged to the ground and filled into the excavated hole Kv Niltal, etc., but in this case, the soil lifted to the ground must be disposed of, and the filling is done separately. There was a drawback that sand had to be prepared for use, which increased costs.

The present invention was devised in view of the above-mentioned drawbacks of the conventional technology, and its purpose is to reduce the cost by reusing the vertically lifted soil in a V-type disposal system, which eliminates the need for moving sand. K provides a method for building piles in the ground where it is possible.

(Both 100 are provided.The excavation shaft (1) is hollow pipe-shaped and has a lower fllkK pit (1!l), and a spout is provided at the lower end of the excavation shaft (1). In the case of the ejection outlet e field, the pit (may be provided in the filtration part) may be one or multiple pits arranged in a row as in the embodiment.In the case of a large one in which multiple pits are arranged, the excavation shaft (
A plurality of 1) may be arranged in a straight line in the horizontal direction, or may be arranged in an arcuate manner, or may be arranged in a polygonal shape such as a triangle or a quadrangle. When multiple excavation shafts fl) can be used, the upper end of each excavation shaft +1+ is connected to the multi-axis device 14, and the rotation of the drive unit JUJ@ is controlled via the multi-axis device -.
The information is transmitted to each excavation axis ill. In the figure (1
At the time, there are nine shafts connected in communication with the m-cutting shaft (1). Then, connect the hose a to a sand consolidation agent supply device for supplying a soil consolidation agent such as cemecit milk, and connect the hose 1 to a 1 sand consolidation agent supply device for supplying a sediment consolidation agent such as cemecit milk from the lower end of the excavation shaft (1). 2) while excavating the ground (3), mixing the excavated soil and soil consolidation agent (2) to form a primary mixed pile (4) in the soil, and excavating to a predetermined area. position Km”f
Reach the lower end of the llJ axis (1). The above step is referred to as the first step. On the other hand, the gravel soil (8) with large grains was removed through the primary mixing ± (IIK sieve and Knead again with Jusu-914 and perform secondary mixing ±(7)
Manufacture. This is called a $2 process. Here in the figure (le
a! The secondary mixed soil feeder feeds the paste-like powder.
Suction part-1 sieve (I7) that sucks the next mixture ± (6),
It has one end, a boss (not shown), etc. Next, in the preparation of the first mixed pile (4), from the lower end of the excavation axis Tl) to the soil consolidation agent (2) K in the first work 11,
Extrude the @secondary mixture (1) produced in the process and drill into the drilling hole (
8), pull up the excavation shaft (1) and fill the #s drilling hole (8) downward and upward in order. KI 12th order mixed theory γ
) are filled to form six piles (9). This is t's code. In the 3rd process, the main mixer is connected to the 2nd mixed soil production and supply device (Is).The 2nd mixing ± (1) is carried out during the TL drilling (8) in the Odate 3 process. As it is pressed out, the 111th mixed pile (6) that constitutes the first mixed pile (4) is lifted up to the ground one after another, but this i11
The next mixed soil +51 is used as a second mixer () by the $2 secondary mixed soil production and supply device, and is again pressure-filled into the excavation hole (8) along the lower end of the excavation shaft (1). At this time, the excavation shaft (1) may be pulled up while rotating, or may be pulled up without rotating. Mana secondary mixed soil) was drilled in the drilling hole (8
), the llll1ll shaft (1) and the primary mixture ±(5) push upward.

If necessary, after the third step, check the pile (-).◆
A fourth step may be added in which a steel pipe or other structural material υ is built to provide the necessary bending strength and other strengths. Although a single pile (9) may be constructed as described above, a retaining wall can be formed by forming the piles (9) in succession so that their ends overlap each other. In addition, as shown in Fig. 3, the excavation shafts (11) rotate respectively, and the multi-axis device -
The plurality of excavation shafts (1) rotate as a whole by rotating the excavation shafts (1).

In the present invention, as described above, the ground is excavated while spouting an earth and sand consolidation agent such as Semeshito Elk from the lower end of the excavation shaft, and at the same time, mm earth and sand and earth and sand consolidator are mixed.
Excavate while forming legal piles in the soil, and place at the designated location //c
The first step is to reach the lower end of the excavation shaft, and as soon as the excavation shaft is lifted to the ground by the excavation shaft, a soil consolidation agent such as cemeshite or fly ash is added to the soil to obtain the required strength, and this is re-kneaded. In the second step of manufacturing the second legal soil, and in the creation of the first legal pile, after the lower end of the excavation shaft reaches the predetermined position, the first carpenter 1! Instead of using a soil consolidation agent in the second process, the *m shaft produced in the second process is pulled up, and the third process is different from the third process, in which the pile is filled with the second legal soil in the excavation hole. Specifically, the #IAlIIl hole is filled with second legal soil adjusted to a predetermined 011 degrees for the entire length in the vertical direction, and the pile is forged.
It has the advantage of being able to easily form piles with a specified strength.
Moreover, the second funder does not need to stir the soil in the *sg hole.Furthermore, the mixed soil that is discharged to the ground after forming the pile is reused, so it is discharged to the ground and the hazardous sand is removed. Since there is no need to separately prepare the materials for the two-way rationalization process, the costs can be calculated on a large scale.

[Brief explanation of the drawing]

1st WJ&) Th) -) (A) is a schematic diagram showing the construction order of the present invention, [Figure 2] (B) ωi A used in the same
rmys 1-, cross-sectional view at the time of forming the first legal pile, and cross-sectional view at the time of forming the pile, Figure 3. A schematic front view and a cross-sectional view when forming the @primary mixed pile, in which (1) is the excavation axis, (2) is the soil consolidation agent, (3) is the ground, and (4) is the first law. Pile, (6
) is the first law and rational attorney, (7) is the second legal and rational soil, (8) is the excavation hole, and flll is the pile.

Claims (1)

[Claims] (1) From the bottom end of the excavation shaft! The ground is excavated while ejecting a soil compaction agent such as lubrication, and the excavated soil and sand compaction agent are mixed to form a primary mixed pile in the soil as the excavation progresses and excavation is carried out at a predetermined location. The first to reach the lower end of the shaft
As soon as the soil is brought up to the ground by the excavation shaft, the first legal engineer adds soil consolidation agents such as cement and fly ash to the required strength and remixes this to form the second mixed soil. In the second step of manufacturing, when the lower end of the excavation shaft reaches a predetermined position in the creation of the first mixed pile, the soil consolidation agent is replaced from the lower end of the excavation shaft in the 1st relaxation step in the second step. The excavation shaft is pulled up while pressing out and filling the secondary mixed soil into the excavated hole, and the second mixed soil is filled into the excavated hole to form the next pile. Method of building piles into the ground.