JPS5837225A - Method of constructing pile into ground - Google Patents

Abstract

PURPOSE:To build 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 by mixing excavated earth and sand and a solidifying agent, conglomerate caly is removed from mixture earth prepared by adding a solidifying agent to earth conveyed up to a ground, and the inside of an excavated hole is filled with mixture earth by pressing out it through an excavating shaft to build a pile. CONSTITUTION:When a ground 3 is excavated as an earth and sand solidifying agent 2 is jetted from a lower end of an excavating shaft 1, an excavating work, simultaneously, progresses as a primary mixture pile 4 is built in earth by mixing the excavated earth and sand and the earth and sand solidifying agent, and the excavating shaft is caused to reach a given position. Then, a solidifying agent such as cement is added to a primary mixture earth 5 which is freed from conglomerate clay 6 of an excessively large particle by passing the primary mixture earth 5, lifted up to a ground, through a sieve 17, and they are kneaded together to prepare a secondary earth 7. Then, the excavating shaft is lifted up as the inside of the excavated hole is filled with the secondary mixture earth 7, pressed out from the lower end of the excavating shaft 1, in place of the earth and sand solidifying agent, and this causes constructing of a pile 9 at the inside of an excavated hole 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for building piles in the ground.
While excavating the ground (3) while spouting an earth and sand consolidation agent (!) like cement milk from the lower end of the pile, the excavated earth and sand consolidation agent (2) are mixed, and the first legal pile (4) is excavated. ) [The first step is to excavate while forming in the soil and reach the lower end of the excavation axis +11 at a predetermined position, and the first process of excavating the soil lifted to the ground by the excavation axis Il+ excavation ± (6) Oversized gravel soil (6) was gradually removed, and then oversized gravel soil (6) was removed.
Remove the button, add soil consolidation agents such as cement and fly ash to the first mixture ±ill until the required strength is achieved, and knead it to produce the second law ±171.11
In the Is step, and after the lower end of the excavation shaft (1) reaches the predetermined position in the creation of the first legal pile (4), the earth and sand consolidation agent (replacement second
The second legal principle produced in the process ± (7)k is extruded and drilled hole (
8) Fill the hole, pull up the drilling shaft (1), and open the drilling hole (
8) A conventional method for constructing piles in the ground, which is characterized by the third step of forming a pile (9) filled with the $2 secondary mixture (7). As a construction method, the nine construction methods are known, for example, as shown in Japanese Patent Publication No. 55-50543. In this conventional example, while excavating the ground, the cemeshite was simply ejected and mixed with this at the same time as the excavation to form the pile. However, no matter how much the mixture is mixed underground, it is impossible to form a pile with uniform strength in the vertical direction. In this conventional example, since cement milk is mixed with excavated soil in the borehole, if the concentration of cement milk becomes high, the fluidity will be low, causing problems in mixing with the excavated soil in the borehole. As a result, the amount of cement used is small and the strength of the piles formed is weak. A conventional example of a pond is one in which all excavated soil is discharged to the ground and the excavated soil is filled with mortar, etc., but in this case, the soil must be lifted to the ground and then disposed of, and a separate disposal process is required. There was a drawback that the cost increased as sand had to be prepared for filling.

The present invention was devised in view of the above-mentioned drawbacks of the conventional technology, and there is less need to dispose of the excavated material, it can be reused, reducing costs, and furthermore, the tip of the excavation shaft is To provide a method for constructing piles in the ground that can be smoothly extruded without being stuck inside the excavation shaft, making it impossible to extrude, and preventing the pile from slipping.

The present invention will be explained in detail below using examples. In the figure fil t-
1 inside? ! It is a pipe-shaped excavation shaft, and the outer periphery is provided with a screw part (101) for lifting and stirring, or a stirring blade (11), or both a screw part 0ω and a stirring blade (]1). (1) has a hollow pipe shape and has a human α force at its lower end, and a jet port (I force) is installed at the bottom end of the excavation shaft fi+.In this case, the jet port α'4 is The pit (11 may be provided in the 1 part).The excavation shaft (11 is 1
It can be a tree or multiple trees lined up. In the case of a plurality of excavation shafts (1) arranged in a row, the plurality of excavation shafts (1) may be arranged laterally in a straight line, or in an arcuate manner.

Alternatively, they may be arranged in a polygonal shape such as a triangle or a quadrangle.

When a plurality of excavation shafts (1) are arranged, the upper end of each excavation shaft fl+ is connected to the multi-axis device 11 (14), and the rotation of each excavation shaft (1) is transmitted through the multi-axis device α41. ). Clause a in the figure is a fixed hose that is connected to the excavation shaft (!).The hose (for supplying lI19 to a soil solidifying agent (2) such as Cemecit Milk) It is connected to the earth and sand consolidation supply device 11-, and the earth and sand consolidation agent f21 i l, such as cement milk, is supplied from the lower end of the excavation shaft (1).
While excavating the ground (3) while taking out 5 IT: Mix the sand and soil consolidation agent (2)! While forming the primary mixed pile (4) in the soil, the excavation progresses until the lower end of the excavation shaft 11+ reaches a predetermined position. The above step is referred to as the first step. On the other hand, the earth was lifted to the ground by the excavation axis (7'j).
@Primary mixing±(51 and sieve (lη) to remove oversized gravel soil (6).

Next, the oversized gravel (61) is removed and the mixture is re-kneaded in 7'j111st mixing (6) to produce the second legal white clay (2018). This is the second step. Here, in the diagram (IIU @ 2nd Mixture in the construction of soil law rational piles (4), from the lower end of the excavation axis fi+, instead of the soil consolidation agent (2) in the 11th step, the 12th mixture produced in the 2nd step ±(71fr) is pumped out and filled into the drilled hole (8) while pulling up the drilling shaft (1) and filling the drilled hole (8) from the bottom to the top for the second mixing ±(7) completely. In the excavation hole (8), the secondary mixture (7) is filled into the t-pile 19 + fi' shape.This is the 11th step.In the third step, the hose end vil - the second legal soil fabrication supply Apparatus i (connected to I).Also, during approximately 3 steps, during the drilling hole (8), when the !1!2nd mixture ± (7)? is squeezed out, the 1st mixed pile (4) I1 to confiscate
The primary mixed soil (61) is brought up to the ground one after another, and this primary mixed soil (61t) is made into a secondary mixed soil (7) by the secondary mixed soil production and supply device Ol, and then the excavation shaft is moved again. The drilling hole (8) is pressurized from the lower end of (1). At this time, the drilling shaft may be pulled up while rotating, or it may be pulled up without making one rotation. Also, the second mixing ± (7) By pressurizing the excavation hole (8) from below, the excavation axis +1+ and the primary mixture ± (6) are pushed upward.According to the above, after @3 root, the inside of the pile (9) is You may also add a fourth step of erecting steel pipes and other structural materials @lj! that are responsible for the necessary bending strength and other strengths. However, if the ends of the piles (9) are formed in succession so that they overlap each other, a retaining wall can be formed.

In addition, when each of the excavation shafts fi+ rotates, the multi-axis device α also rotates, so that the plurality of excavation shafts (1) rotate as a whole.

In the present invention, as described above, the ground is excavated while spouting an earth and sand consolidation agent such as cement milk from the lower end of the excavation shaft, and the excavated earth and sand are mixed with the earth and sand consolidation agent to perform the first mixed cropping. The first step is to excavate while forming piles in the soil, and to reach the lower end of the excavation shaft at a predetermined position. The second step is to add soil and sand consolidation agent to the required strength and knead it again to create the second mixing stage, and the lower end of the excavation shaft reaches the predetermined position during the creation of the 11th mixing table wipe. After finishing, all of the second mixed soil produced in the second step is pressed out from the bottom end of the excavation shaft instead of the earth and sand consolidation agent in the first refreshing step, and while filling it into the excavation hole, the excavation shaft is pulled up and the soil is poured into the excavation hole. @The third step is filling with the secondary mixed soil and forming a pile, so finally the excavated hole is filled with the secondary mixed soil that has been adjusted to the specified strength over the entire length in the vertical direction. This method has the advantage that piles with a specified strength can be easily formed, and since the secondary mixed soil does not need to be stirred in the excavation hole, it has a large amount of cementite and a high degree of fa. There are no problems with this, and high-strength piles can be formed. Furthermore, in the second process, the earth is lifted to the ground by the excavation axis! Since the gravel soil with large particles is removed by passing it through the 11th mixing method sieve, the second
There is no large-sized gravel in the mixed soil, and as a result, the hose, the excavation shaft, and the spout of the excavation shaft do not get clogged.As a result, the primary soil that was lifted to the ground Even if the mixed soil is reused, there is no problem in ejecting it from the spout of the excavation shaft, and the secondary mixed soil can be filled into the excavation hole in the event of a disaster. Mixed soil excavated on the ground when forming the Mayu pile±? Since it is reused, there is little need to dispose of the earth and sand on the ground, and there is no need to separately prepare sand, etc., which is the material for the MABIBI 2 legal rationale, so it is possible to save a lot of money. be.

[Brief explanation of the drawing]

Figure 1 (a) (b) (c) (d) 'a Schematic diagram showing the construction sequence of the present invention, Figure 2 (a) (b) (c)
is a schematic diagram showing an example of an excavator used in the above, tIF11
Figures 3 (a) (b) (are schematic diagrams showing the other side of the same excavator as above and semi-1 mixed pile piles). 4 is a cross-sectional view at the time of formation, (1) is the excavation shaft, (21U earth and sand consolidation agent, (3) is the ground percentage, (4) is the primary mixed pile 161 is the primary mixed soil, (7
) is the secondary mixed soil, (8) is the excavated hole, and (9) is the pile. Figure 1 (c) (d)

Claims (1)

[Claims] il+ Excavate the ground while squirting an earth and sand consolidation agent such as cement milk from the lower end of the excavation shaft, mix the excavated earth and sand with the earth and sand consolidation agent, insert the first mixed pile into the soil, and excavate. , the first to reach the lower end of the excavation shaft to a predetermined position.
The process is as follows: The first legal soil that is lifted to the ground by the excavation axis is sieved to remove oversized gravel soil. The lower end of the excavation shaft reaches the predetermined position in the second step of creating the second legal soil by adding soil consolidation agent to the required strength and re-mixing it to create the second mixed pile. After 7, from the bottom end of the excavation shaft, instead of using the soil consolidation agent in the first step, press out the second legal soil produced in the second step and fill it into the excavation hole. The second legal soil is filled inside to form a pile!11
Consisting of 3 steps 1w # Method of constructing piles in moldy ground.