JPS58521A - Method and device for setting foundation pile - Google Patents

Abstract

PURPOSE:To perform concurrently the excavation of a pit and the settlement of a pile by providing an excavating head and an excavating and stirring blade capable of expanding to a dimension larger than the outside diameter of the pile during expansion but of contracting to a dimension smaller than the inside diameter of the pile during contraction to the tip and its neighborhood of a shaft. CONSTITUTION:When turning an excavating shaft 1, a tip head 29 excavates the ground, an excavating and stirring blade 30 drills a pit to be settled with a pile 2, a soil stabilizer jetted from a nozzle 31 is mixed with soil while stirring, and excavated soil is discharged by a blade 28. When the tip head 29 reaches a support layer, and the soil stabilizer is injected from the nozzle 31 and mixed with soil and sand to form a hardened soil portion. After the pile 2 reaches a given depth, a driven portion 13, a swivel 14, and the shaft 27 of the excavating shaft 1 are pulled up by a distance L and at the same time pressure sending pipes 19 and 25 are pushed down by the distance L by operating an oil-pressure cylinder 21. Then, the excavating and stirring blade 30 contracts and passes through the hollow 3 of the pile 2, and the excavating shaft 1 is drawn out.

Description

[Detailed description of the invention] The present invention relates to a pile installation method and apparatus.

For the conventional foundation pile installation method.

There are (1), hen i driving method (2), cement square method (3), and Nakahori method, etc., but the above method (1) uses a hammer to give a rough blow to the pile, causing the pile to cave in. This method causes severe noise and vibration, which is undesirable from a social environment.Furthermore, the ground around the installation hole becomes loose, and the supporting capacity around the pile is extremely reduced. Furthermore, the construction method (2) requires two steps: the step of excavating the hole with a screw auger serving as the excavation shaft, and the step of sinking the pile, and is complicated and takes a lot of time. On the other hand,
Method (3) is a method in which a screw auger is placed in the hollow part of the pile, and the screw auger and the pile sink down and penetrate as one. However, since the outer diameter of the screw auger is smaller than the inner diameter of the pile, Due to the resistance from the surrounding ground, which is the area where the piles are exposed, it becomes necessary to press in the piles continuously using force that overcomes the mosquito resistance and the frictional resistance of the surrounding walls of the piles, making it impossible to install the piles without collapsing the surrounding ground. Therefore, it is difficult to develop the supporting force around the pile.

Therefore, the purpose of this invention is to provide a low-pollution construction method that involves quiet work, and a process for excavating holes for installing piles.

To provide a method for installing foundation piles and an apparatus therefor, which simultaneously perform the step of sinking piles and ensure not only support force at the tip of the pile but also support force including the friction force on the peripheral wall of the pile.

Embodiments of the present invention will be described in detail and specifically below based on the drawings.

In Fig. 1.2, 1 is an excavation shaft, and 2 is a pile to be dug by a PC pile, a steel pipe pile, etc. The excavation shaft 1 is rotatably held;

Vertical holding guide 4 that guides said 2 vertically Kvj into the ground
It is held so that it can move up and down. 5 is a support fitting;
The vertical holding guide 4 is fixed to a support 6. 7 is a self-propelled vehicle with caterpillars that supports and moves the pillar 6. Further, a plant mixer 9. Hydraulic unit 10. pump 11
．． An automatic soil stabilizer and soil hardening agent flow rate controller 12 is connected to the excavation shaft 1, and is configured to feed the soil stabilizer and/or soil hardening agent to the excavation shaft 1 at a required pressure and flow rate. In front of the excavation shaft 1, a drive section 13 such as a motor and a swivel 14 for rotating the excavation shaft 1 once are provided, and the drive section 13 is supported by a frame 15. As shown in FIG. 3, the frame i5 is held slidably up and down with respect to the support column 6. As shown in FIG. 4, the swivel 14 is connected to the drive section 13 by a 72-inch 16, so that the swivel 14 as a whole rotates. Pumping 'l1ls and flexible tube 17 through which the soil stabilizer and soil hardening agent are fed
Although it does not rotate.

The rotatable joint 18 and the pressure feed pipe 19 are structured to rotate together with the swivel 14. The crosshead supports the pressure feed pipe 19 and is connected to the guide 22 by the hydraulic cylinder 21.
It has a structure that allows it to slide up and down while being guided by.

The outer pipe joint 23 is made of screws that connect the excavation shaft 1. The pressure feed pipe joint 24 is a screw that connects the pressure feed pipes extending downward within the excavation shaft 1.

The two-rotation gear 26 is used for rotating and fastening the pressure-feeding pipe joint 24 only when connecting short pressure-feeding pipes 25.

Next, the process of depositing <i2 will be described in detail.

As shown in FIG. 5, the excavation shaft 1 includes a shaft 7) 27 and a blade 28.
．． and a tip head for drilling, and the shirt) 2
An excavation stirring blade (equipment) is provided near the tip of 7.

#The excavation agitation 1jL30 is configured as described below, and has a blade spread dimension that is equal to or greater than the outer diameter D1 of the pile 2 to be sunk when expanded, and smaller than the inner diameter of the pile 2 when reduced. The above-mentioned shirt 270 has a structure that can be expanded and contracted in the radial direction.

In the front, a pressure feeding tube shown in FIG. 4 is guided to the tip head component, and has an open end as a nozzle 31.

Note that one feather may be omitted.

When the excavation shaft lt is rotated, the tip head device cuts the ground, and the excavation agitator x3o excavates a sinking hole (diameter D2) that is equal to or larger than the outer diameter D1 of the pile 2, Further, the nine earth stabilizer is poured out from the nozzle 31 and mixed with stirring. Of the earth and sand that was excavated,
An amount of earth and sand approximately equivalent to the volume of the outer diameter D1 of the pile is scooped up onto the screw conveyor 2 and carried out to the ground without receiving any resistance from the ground at the tip of the pile 2 and the surrounding wall.

Moreover, it becomes possible to replace the cut earth and sand with the pile 2 smoothly and quietly without weakening or collapsing the ground around the pile 20. Thus, while forming a soil stabilizing portion 32 on the circumferential wall of the pile 20, #2 sinks and penetrates between the intermediate layers of the ground together with the excavation shaft 1. When the tip head of the excavation shaft 1 reaches the support layer 34 of the ground, the nozzle 31
The soil stabilizer that has been poured out from the soil stabilizer is switched to a soil hardening agent as necessary and poured out, and is stirred and mixed with the earth and sand in the excavation and stirring kōgiku. When the hardened soil wing is formed and the tip head of the excavation shaft l and the pile 2 reach a predetermined depth, the process of sinking the pile 2 is completed. As shown in FIG. 6, the pile 2, which has been completely sunk, is supported by the soil stabilizing portion 32, and the surrounding wall friction force of (2) is ensured, which generates a peripheral supporting force. A tip support force of 2 is developed.

After the work is completed, the excavation shaft 1 is pulled out to the top as shown in Figure 6. Figures 7 and 8 show the state in which the excavation shaft 1 moves from the process of entering the ground to the process of being pulled out. Explain in detail.

A portion of the tip head device of the excavation shaft 1 slides and sinks inside the shaft portion n, and the convex portion 29 &
The tip end corner 27aK of the shaft 7) 827 stops, and the tip head part and the shaft part are connected by an excavation agitator X30 that can be retracted and retracted in the circumferential direction of the excavation shaft l.

#The excavation stirring blade (equipment) is as shown in Figures 9 to 14.
t", Gold A30 &, 30b, Pol) 30c, 3
0d, 30e and nuts 3Of, 30g, 30h, forming a link mechanism.

Fig. 7 shows the state in which the excavation shaft 1 is entering the ground, and a part of the tip head part is not connected to the shaft part n.
, the -1 stirring 1L 30 expands in the direction of the middle diameter of the excavation shaft 1.

When the pile 2 sinks and penetrates, the ground is excavated and the soil, soil stabilizer, and/or soil hardener are stirred and mixed. First, Fig. 8 shows the state in which the pile 2 has been completely deposited, the subshaft 1 is being pulled out of the ground, but the state shown in Figs. 7 to 8 is to be achieved.

The drive section 13, swivel 14, and shaft section of the excavation shaft 1 shown in FIG. Activate the pressure feed pipe 19,
Push down on 25. In this way, as shown in FIG. 8, the tip head part of the excavation shaft 1 will protrude relative to the shaft part n, even in the state shown in FIG.
As a result, the excavation agitation blade reduces the circumferential direction of the excavation shaft 10, easily passes through the hollow part 3 of (2), and the excavation shaft 1 is pulled out to the ground.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and can be modified in many ways.

For example, Figure 1115.16 shows the drilling agitation ga of this invention.
.

The second 'l! This is an example. Figure 16 shows the state in which the excavation shaft and pile 2 are sinking and penetrating.

FIG. 16 shows a state in which the laying of the pile 2 has been completed and the excavation shaft 36 is being pulled out. What are the features and effects of this second embodiment?

(1) Since the excavation stirring blade 37 is set in a knee position, stirring and mixing is reliable.

(2) Since the excavation agitation 437 has a two-stage look/see mechanism, when the excavation shaft 36 is pulled out to the ground, the excavation agitation blade 37
It is pressed by the tip of the foil 2 and automatically shrinks.

゛(3) Between the tip head parts of the excavation shaft 36, the shaft part 3
There is no need to create a structure that slides or immerses into the body.

It's good that it's all in one piece.

(4) The swivel attached to the upper part of the excavation shaft 36 has a simple structure since the hydraulic cylinder 21 of the swivel 14 shown in FIG. 4 of the above embodiment is not required.
° ゛Again. Figures 17 and 18 show a third embodiment of the tube 1111 stirring x30 according to the present invention. Fig. 17 shows a state in which the excavation shaft and the pile 2 are sinking and penetrating, and Fig. 18 shows a state in which the setting of the pile 2 has been completed and the excavation shaft is being pulled out.

41 is an excavation stirring blade, 42 is a bottle, '43m, '43b
, 43a are stoppers, and when the excavation shaft is pulled out onto the ground, the excavation agitation blade 41 rotates in the two directions of the arrows around the pin shaft due to the unbalance of its own weight.

In the unlikely event that it cannot rotate due to its own weight (due to frictional resistance, etc.), the digging-U stirring blade 41 is pressed by the tip of the pile 2.

Can be automatically reduced. The feature of this third embodiment is that the excavation stirring blade blade of the second embodiment also has a simple structure.

As is clear from the above detailed description, the present invention provides the following effects.

(1) The process of excavating the installation hole of The supporting force of the surrounding wall increases.

e) The excavation agitation blade excavates a hole that is equal to or larger than the outer diameter of the pile, and an amount of earth and sand approximately equivalent to the volume of the pile is brought to the ground, so that it is removed from the ground at the tip of the pile and the surrounding wall. Earth and sand can be smoothly replaced with piles without any resistance, no equipment for press-fitting or striking piles is required, and the installation work can be carried out quietly.

[Brief explanation of drawings]

FIG. 1 is a side view showing the entire embodiment of the invention. Figure 2 is a sectional view taken in the direction of arrow G in Figure 1, and Figure 3 is a cross-sectional view of the
4 is a longitudinal sectional view of the swivel portion, 5 is a partially cutaway longitudinal sectional view showing the pile sinking process of this invention, and 6 is a completed work. After that, a partially cutaway vertical cross-sectional view showing the state in which the excavation shaft is being pulled out to the ground.
．． Figure 8 is a front view showing the excavation agitation blade in an expanded state, Figure 8 is a front view showing the excavation agitation blade in a reduced state as the excavation shaft is being pulled out to the ground, and Figure 9 is the ■-- of Figure 7. ■ Direction arrow view, 1θ diagram is the x-x direction arrow view of Figure 7, WL
Figure l1 is a front view of the metal fitting, which is one of the parts of the excavation stirring blade.
Fig. 12 is a plan view of Fig. 1, Fig. 13 is a front view of a metal fitting that is one part of the excavation stirring blade, - Fig. 14 is a plan view of Fig. 13, and Fig. 15 shows an enlarged view of the excavation stirring blade. A front view showing the @2 example of this invention in good condition, Figure 16 is a front view showing the second embodiment of this invention with the excavation stirring blades reduced, and Figure 51117 shows the excavation stirring blades enlarged. FIG. 18 is a front view showing the third embodiment of the present invention in a state where the spider cutting stirring blade is contracted. In the figure, 1 is the excavation shaft, 2 is the pile, 3 is the hollow part of the pile 2, 4 is the vertical holding guide, and 5 is the support metal fitting. 6 is a prop, 7 is a self-propelled vehicle with caterpillars, and 8 is a pressure pipe. 9 is the plant construction Φ, IO is the hydraulic unit, li/fi
Pump, 12 is an automatic flow rate controller, 13 is a drive unit, 1
4 is swivel, 15 is frame, 16 is 7 lunge, 1
7 is 7 lexiple tube, 18 is rotary joint,
19 is a pressure pipe, 20 is a crosshead, 21 is a hydraulic cylinder, 22 is a guide, 23 is an outer pipe joint, 24 is a pressure pipe joint, 25 is a pressure pipe, 26 is a rotating gear, 27 is a shaft portion of the excavation shaft 1, 27a is the tip of the shaft flI27. 2 is a blade, 29 is a tip head portion of the excavation shaft l, 29a is a convex portion of the tip head device, and 30 is an excavation agitation blade, aOa. 30b are metal fittings for drilling and stirring fungi, 30c and 30d, respectively.
. 30f, 30g, 30h are the nuts to which the drilling stirring genus bacteria are attached, 30f, 30g, 30h are the nuts to which the qt + stirring $130 are attached *n, 31 is the nozzle, 3
Reference numeral 2 indicates a soil stabilization section, 33 an intermediate layer, 34 a support layer, and 35 a soil hardening section. Agent Patent Attorney Yoshimi Saigo J11 Figure 71Il No. 80! ! Figure 111m Figure 112 Figure 1311 Figure 14 Figure 151!1 Figure 17 #116 Figure 18

Claims (1)

[Claims] 1. The shaft has a tip head for digging at the tip. When expanding, the dimensions should be larger than the outer diameter of the foundation pile that should be sunk.
At the time of reduction of the foundation pile, an excavation shaft having an expandable and contractible excavation agitator smaller than the inner diameter of the foundation pile near the tip of the shaft is inserted into the hollow part of the foundation pile. While excavating the ground using the tip head. A foundation characterized in that the excavation stirring blade is used to sink and penetrate the foundation pile while forming an installation hole with a diameter equal to or larger than the outer diameter of the foundation pile, and at the same time pour out and stir a soil stabilizing hardening agent into the ground. Installation method 2: Install a grip head at the tip of the shaft. A foundation pile characterized in that an expandable and contractible excavation/excavation stirring blade is provided near the tip of the shaft, the dimension being larger than the outer diameter of the foundation pile to be sunk when expanded, and smaller than the inside diameter of the foundation pile when reduced. Installation equipment.