JPH0258623A - Method and device for creating gravel pile - Google Patents

Abstract

PURPOSE:To form a strong gravel pile by intruding a rotary casing in the ground, and thereafter, vertically moving a fixed casing located in the rotary casing so as to press the gravel to be dense, and pulling out the rotary casing with the reaction of the vertical moving. CONSTITUTION:A fixed casing 8 is inserted to locate into a rotary casing 3 rotatably lowered down from the lower part of a machine frame 1, and is enabled to move up and down by a fluid pressure cylinder 10. Next, after the rotary casing 3 is normally rotated and intruded to the required depth in the ground W, the fixed casing 8 is moved up and down with the required stroke under the condition of normal rotation or the rest of the rotary casing 3. And while the exhausted gravel is pressed to be dense, the rotary casing 3 is gradually pulled out using the reaction of the moving down. Thereby, the densely pressed gravel is stayed in the ground W without hindering its pressed density and can be functioned as a gravel pile P.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a construction method for improving soft ground and an apparatus therefor. Using a non-rotating casing (fixed casing) that is inserted into the rotating casing in order to make it easier, the rotating casing is penetrated into the ground to the required depth, and then while the rotating casing is pulled out, Gravel such as sand and gravel supplied into the fixed casing is discharged from the lower end of the fixed casing, and the gravel is poured into the ground.
This invention relates to construction methods and equipment for creating columnar pits (columnar bodies of sand, gravel, etc.).

(Conventional Technique) Conventionally, in the casing penetration process, the rotating casing is rotated in the forward direction according to the advancing direction of the screw to penetrate into the ground, but in the casing extraction process, the rotating casing is pulled out while being rotated in the reverse direction. ing.

(Problem to be Solved by the Invention) As mentioned above, when the gauging is pulled out while rotating in reverse during the pulling out process, the excavated ground is backfilled, and the backfilled soil is used during pile construction. Because of this, it was not possible to obtain high-quality, strong, and well-drained piles. For this reason, when the rotating casing is rotated in the same forward direction as when it was penetrated, or when it is pulled out in a stationary state, the ground resistance acting on the rotating casing increases, causing the winch to wind up the suspension wire. It was difficult to pull out the casing with the operation, and the workability was poor.

An object of the present invention is to provide a glacial trench construction method and device that can solve these problems.

(Means for Solving the Problems) The first invention for achieving the above-mentioned object includes a rotating casing with a screw attached to the lower part of the machine frame in a rotatable manner, and and a fixed casing that is inserted into the rotary casing and moved downward by a required distance while protruding from the lower end of the rotary casing by means of a fluid pressure cylinder interposed between the rotary casing and the machine frame, and the rotary casing is rotated in the normal direction. After the gravel has penetrated into the ground to the required depth, in the casing extraction process, the fixed casing is moved up and down while the rotating casing is rotated forward or stationary, consolidating the gravel discharged from the fixed casing and removing the gravel beneath it. The rotating casing is pulled out by utilizing the reaction force from the gravel that the fixed casing receives when moving.Also, as for the gravel pile making device of the second invention, a vertical F is rotatably connected to the bottom of the machine frame. The fixed casing is inserted into the rotary gauging and the machine frame is interposed between the rotary casing with a screw and a hydraulic cylinder for vertically driving the fixed casing. - It consists of a fixed casing that moves vertically up and down, a bar for supplying crackers that is integrally connected to the upper part of the fixed casing, and a motor for driving the rotating casing that is arranged on the machine frame.

And, the gravel pile making device of the third invention is rotatably connected to the lower part of the machine frame, has a screw on the outer peripheral surface, and has a plurality of pins attached to the lower end periphery. a casing; a fixed casing that is inserted into the rotating casing and moves up and down by a required stroke while protruding from the lower end of the rotating casing by a fluid pressure cylinder for vertically driving the fixed casing, which is interposed between the rotating casing and the machine frame; A gravel supply popper is integrally connected to the two parts of the fixed casing, a rotating gooseong drive motor is installed in the machine frame, and a vibrator is attached to the lower end of the support rod inserted into the fixed casing. The bottom plate is installed above the inside of the fixed casing, and when the casing is penetrated, the bottom plate is held in a position that closes the lower end opening of the fixed casing via the support rod, and when the casing is pulled out, the support rod is moved downward. and a hydraulic cylinder for driving a support rod to cause the bottom plate to protrude downward a required length from the lower end of the fixed casing.

(Example) Examples will be described with reference to the drawings.

Figure 1 shows the gravel pile building device used in the present invention. In this figure, 1 is a machine frame that is suspended from a league (not shown) installed on a crawler crane or the like so that it can be raised and lowered. A rotary casing 3 with a screw 2 screwed onto its outer peripheral surface is rotatably hung from the lower part of the frame 1, and this rotary casing 3 is connected to a rotary casing driving motor 4,
The gear 5.5 fixed to the output shaft of the rotating casing 3 meshes with and rotates the gear 6 fixed to the upper end of the rotating casing 3, thereby driving the rotating casing. The pinot I/7 for drilling is attached to the lower edge of the casing 3.
2 to 4 are installed.

A fixed casing 8 is inserted into the rotating casing 3, and a gravel supply hopper 9 is integrally connected to the upper end of the fixed casing 8. A fluid pressure cylinder 10.10 for vertically driving the fixed casing allows the rotary casing 3 to move vertically by a required stroke S while protruding from the lower end of the rotating casing 3, as shown by the imaginary line in FIG. Each fluid pressure cylinder 10 is a hydraulic cylinder, and a piston rod 10a is attached to the machine frame 1, and the cylinder tube side is attached to the fixed casing 8 side via a bracket 24. Furthermore, in FIG. 1, each fluid pressure cylinder 10 and the rotary casing drive element 4 are shown overlapping each other, but in reality, both are located around the fixed casing 8 at 90 degrees relative to each other.
It is assumed that they are arranged at an interval of 0°.

A large-diameter cylindrical relay tank 11 is interposed between the chute 9a of the gravel supply hopper 9 and the fixed casing 8, and is capable of accommodating enough gravel for eight fixed casings. In addition, inside the chute 9a,
An on-off valve 12 that opens and closes the inlet opening of the chute 9a is provided, and is also a means for supplying pressurized air into the relay tank 11, and at the same time, an air valve 12 that pushes the on-off valve 12 to close using the injected air pressure. A supply nozzle 13 is provided. Note that the on-off valve 12 is normally closed by its own weight (9a)
is held in a position that fully opens the inlet opening.

A hollow support rod 14 is inserted to hang down from the inside of the relay tank 11 to the inside of the fixed casing 8, and this support rod 1
A vibroflora eye 5 is installed at the lower end of the vibrofront 15, and a bottom Fi 16 formed in the shape of a disc and having an outer diameter approximately the same as that of the fixed casing 8 is fixed to the lower end of the vibrofront 15 by an iron plate. ing. The upper end of the support rod 14 is connected to a piston rod 17a of a hydraulic cylinder 17 for driving the support rod, which is made of, for example, a hydraulic cylinder. The installation is fixed. When the fluid pressure cylinder 17 penetrates into the casing, the piston rod 17a is in a contracted state, and the bottom plate 16 at the lower end of the vibrofront 15 is fixed to the casing 8 via the support rod 14.
The lower end of the fixed casing 8 is closed as shown by the solid line in FIG.
6 together with the vibrofront 15 from the lower end of the fixed casing 8 to a position shown by the phantom line in FIG. 1 by a required length T, and is held at that position. The bracket 18 has a structure that allows gravel from the shoe 9a side to freely flow and fall to the relay tank 11 side. Further, the upper end side of the fluid pressure cylinder 17 and the support rod 14 connected thereto is protected by a protective tube 19 suspended by the bracket eye 8. In addition, 20 is the support rod I4
This is a guide member that slidably supports and guides the fixed casing 8, and is attached to the inner surface of the fixed casing 8, allowing gravel and air to circulate. As shown in FIG. 2, the pipe flow rods 2, 1, and 15 have an electric motor 22 disposed inside a cylindrical front body 21 having a diameter sufficiently larger than that of the support rod 14, and are connected to the output shaft of the electric motor 22. The eccentric shaft body 23 is mounted on an axis, and the eccentric rotation of the eccentric shaft body 23 due to the rotation of the electric motor 22 causes horizontal and vertical vibrations in the main body 21. Yes.Electric motor 2
The cap tire 23 for 2 passes through the hollow part of the support rod 14, hangs down, comes out inside the protective tube 19 at the tenth end of the support rod 1.1, and is appropriately extended to the outside from the support rod 1.1. ing. When this Hybro Frono 115 is pulled out from the tank 8, the lower blade C and the bottom plate 1G protrude from the lower end of the fixed casing 8, as shown by the imaginary line in Figure 1. At the position where it comes out, fix /, - Thing 8
The vibrations compact the gravel that is pushed out from the bottom. Furthermore, by contracting the fluid pressure cylinder 17 when penetrating the casing, the vibrator 1 [17 and 15] fits into the fixing screw/puffer 8 as shown by the solid line in FIG. ;,10
) The bottom plate 1G at the end of 1-15F closes the lower end opening of the fixed casing 8.
Prevents leakage from the bottom end.

Next (Part 1 describes how to create a trench in soft ground W using a device with the structure described above.
and 3rd section 7 A-1.

At the beginning of the first work of Graher Pile Responsibility. 1, the third [1
As shown by qA, the on-off valve 12 is open and 2.
If o7. "r+)i45i;L)l'il constant'y-
:;N: 7゛ll inside j''l pull 2, included z1, the bottom plate 16 is in a state of blocking the L1 part between 4 and the end of this fixed Imaichi son''8, and it seems like it is a In state ζ, gravel G is input from bar 9 and fixed IT.
−'+・ji・ri 8 and relay tank 10 are filled. Relay at this time;'””:' Gravel in IO [
J Noshi...Le is indicated by 1, 1 in Figure 1, this glue is one of the glues. The capacity of gravel G between
It corresponds to the star of Gura ＼ru anti-duty created inside.

In this state filled with gravel G, the machine frame 1 is suspended from the negative part 1), and the suspension wire (not shown) is fed out while rotating the rotating casing 3 in the normal direction. As shown in Figure 3B, it penetrates into the ground W and goes -C. When the rotating casing 3 reaches a predetermined depth, its rotation is stopped 7, and the supply of pressurized air is started from the air supply 2 nozzle 13, and at this time, the on-off valve 12 is moved to the closed position by the air pressure injected from the nozzle 13. actuated, thereby increasing the air pressure in the headspace within the relay tank. While the gravel G in the relay tank 11 is pressurized by the increased air pressure, the rotating casing 3 is kept stationary without rotating, or rotated in the normal direction as in the case of penetration, as shown in Fig. 3C. Do not wind up the suspension wire.
At the same time as starting to pull out the thing, the fluid pressure cylinder 10
．． 10 is extended and retracted to reciprocate the fixed casing 8 downward, and the fluid pressure cylinder 17 is extended and moved to move the vibrofluro rod 15 and bottom plate 16 from the lower end of the fixed casing 8 downward through the support rod 14. It is held in the protruding position, and at the same time, the vibrofluoro rod 15 is also vibrated. In this case, the fixed gaming ring 8 is connected to the hydraulic cylinder 1.
Due to the expansion and contraction operation of 0.10, the stroke S is made when the rotary rung 3 protrudes from the lower end as shown by the imaginary line in Fig. 1.
When the bottom plate 1 [j reciprocates downward, the bottom plate 1 [j also moves up and down with the same stroke S while protruding in the F direction of the fixed casing 8 as shown by the imaginary line in the same figure. From tank 8! ) The inlet G is tamped and consolidated, and during this consolidation, the lower end of the fixed casing 8 and the bottom plate 6 are moving from the upper limit position to the lower limit position of their stroke S. When the fixed casing 8 and/or the bottom plate 16 receive a reaction force from the consolidated gravel G while moving toward On the other hand, each fluid pressure cylinder 10, which was stationary and the cylinder tube side was moving downward, is now in a cylinder position.

The piston will move upward while the piston remains stationary.
As a result, from the point at which the fixed casing 8 stops moving downward, the rotary gauging 3 is pushed up in the Z direction by the length of the remaining stroke.

Rotation b-sing 3 due to reaction force from such gravel
The pushing up action works every time the fixed casing 8 moves downward or at random, so that it can be easily pulled out even when the rotating casing 3 is stationary or rotating normally, and the suspension wire can be simply wound up. You can use this operation.

As the rotary casing 3 is pulled out as described above, the pressurized gravel G is discharged from the lower end of the fixed casing 8, and a gravel pit P is created in the ground W. In this case, the extruded gravel G is subjected to the compaction action due to the downward movement of the fixed casing 8 and the bottom plate 16, as well as the vibration action due to the vibratory groove 4, so that the extruded gravel G is sufficiently consolidated into a very strong gravel pit P. Moreover, since the rotating casing 3 is stationary or rotating normally when the casing is pulled out, the ground is not mixed with gravel, and a high-quality gravel resistance P can be obtained.

Further, as is clear from FIG. 3C, as the gravel G is discharged from the fixed casing 8 into the ground W, the level of the gravel G in the relay tank 11 decreases. Then, by raising the rotating casing 3 above the ground as shown in the third diagram, the capacity of one fixed casing 8, that is, the level L + , l-0(
(See Figure 1) A gravel pit P is created in an amount corresponding to the capacity between the two. When the rotating casing 3 is pulled up to the ground, the supply of pressurized air is stopped, and the support rod 1
4 and closes the lower end opening of the fixed casing 8 with the bottom plate 16 to prevent gravel G from flowing out.

After completing the creation of the first gravel pit P in this way, the equipment is moved to another location, where the two series of operations are performed again to create the second gravel pit. However, in the construction work at this other location, the third
As shown in Figure E, since the fixed casing 8 is still filled with gravel from the gravel piles and wood, the construction work can be carried out in a connected manner without particularly supplying gravel. Therefore, the supply of gravel may be carried out as appropriate before starting the construction of the third gravel pit.

In this embodiment, a rotating casing without a bottom M (shoe) at the lower end is used, a support rod is inserted into the fixed casing, and a bottom plate is attached to the lower end of the casing via a vibrator. Although the bottom plate closes the bottom opening of the fixed casing, it is also possible to use a rotating casing with a bottom cover attached to the bottom end so that it can be opened and closed.In that case, the bottom plate at the bottom of the support rod can be omitted. good.

Further, the relay tank illustrated in this embodiment can be omitted and may be used as necessary.

(Effects of the Invention) According to the present invention, in the casing drawing process, the fixed casing is moved up and down by a required stroke while protruding from the lower end of the rotating casing, and the gravel discharged from the fixed casing is consolidated and the gravel is moved downward. Since the reaction force from the gravel that the stationary casing receives is used to apply upward force to the rotating casing,
Even if the rotating casing is in the same forward rotation state or stationary state as when it is penetrated, the rotating casing will be pushed up against the ground resistance, making it easier to pull out the work, improving work efficiency, and improving the ability to move over the gravel surface. It is possible to prevent the contamination of dirt and create a high-quality gravel drain shaft, and the compaction effect of the gravel caused by the up and down reciprocation of the fixed casing makes it possible to create a strongly compacted gravel shaft.

In addition, a support rod is inserted into the fixed casing, a bottom plate is attached to the lower end of the support rod via a vibrator, and the upper end of the support rod is connected to a hydraulic cylinder for driving the support rod installed above the inside of the fixed casing. By using a gravel pile making device of A gravel drag can be created, and the reaction force from the gravel can be received by both the fixed casing and the bottom plate, so the reaction force from the gravel can be used more effectively.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a gravel pile construction device showing an embodiment of the present invention, Fig. 2 is an enlarged longitudinal cross-sectional view of a vibrofloat, and Figs. It is an explanatory view showing a construction process. ■... Machine frame, 3... Rotating casing, 4... Rotating gearing drive motor, 8... Fixed casing, 9...
Gravel supply bomber, 10...Fluid pressure cylinder for vertically driving fixed casing, 11...Relay tank, 1
2... Open/close valve, 13... Air supply nozzle, 14...
・Support rod, 15...Hybroflosoto (vibrator), 16...Bottom plate, 17...Fluid pressure cylinder for driving the support rod.

Claims (3)

[Claims] (1) A rotary casing with a screw attached to the lower part of the machine frame so as to be rotatable, and a fluid pressure cylinder inserted into the rotary casing and interposed between the machine frame and the lower end of the rotary casing. The rotating casing is equipped with a fixed casing that moves up and down for the required stroke while protruding from the ground, and after the rotating casing is rotated in the normal direction and penetrates into the ground to the required depth, the rotating casing is fixed in the normal rotating or stationary state during the casing extraction process. A gravel pile construction method characterized by moving the casing up and down to compact the gravel discharged from the fixed casing, and pulling out the rotating casing by using the reaction force from the gravel that the fixed casing receives during the downward movement. (2) A rotating casing with a screw attached to the lower part of the machine frame so as to be rotatable, and a fluid for driving the fixed casing up and down, which is inserted into the rotating casing and interposed between the machine frame and the machine frame. A fixed casing that protrudes from the lower end of the rotating casing using a pressure cylinder and moves up and down by a required stroke, a hopper for supplying gravel connected to the upper part of the fixed casing, and a motor for driving the rotating casing installed in the machine frame. A gravel pile creation device consisting of . (3), which is rotatably suspended from the bottom of the machine frame,
A rotating casing that has a screw on its outer circumferential surface and multiple bits attached to its lower edge, and a fixed casing that is inserted into this rotating casing and interposed between it and the machine frame for vertical drive. A fixed casing that protrudes from the lower end of the rotating casing and moves up and down by a required stroke using a hydraulic cylinder, a gravel supply hopper that is connected to the upper part of the fixed casing, and a motor that drives the rotating casing that is installed in the machine frame. and a bottom plate attached via a vibrator to the lower end of the support rod inserted into the fixed casing, and a bottom plate installed above the inside of the fixed casing, and when the casing is penetrated, the bottom plate is fixed via the support rod. A gravel pile consisting of a hydraulic cylinder for driving a support rod, which holds the opening at the lower end of the casing in a closed position, and moves the support rod downward when the casing is pulled out to cause the bottom plate to protrude a required length downward from the lower end of the fixed casing. Creation equipment.