JPH0629510B2 - Concrete pile foundation method and equipment used therefor - Google Patents

Description

TECHNICAL FIELD The present invention relates to a general pile foundation construction method in which a tip of a pile is swiveled and a drilling fluid is ejected from a rotary rod while being ejected, and an apparatus used in the construction method. is there.

[Conventional technology]

Conventionally, as the pile foundation method, a method of directly hitting the pile head with a drop hammer or a diesel hammer to install the pile, or a method of installing the pile by using the vibration and resonance force of the vibro hammer is adopted. However, since these methods are accompanied by noise and vibration during the construction, they often cause pollution problems.

Therefore, recently, after excavating the ground where the pile is installed, the cement milk injection method of injecting cement milk etc. to build the pile, or inserting the screw auger into the hollow part of the hollow pile to excavate the ground at the tip of the pile. Then, the excavated soil is discharged through the inside of the pile to the outside of the pile, and the middle excavation method of submerging the pile into the ground has come to be constructed.

[Problems to be solved by the invention]

Since these construction methods are vibration-free and noise-free construction methods, they contribute to the elimination of pollution problems, but the former cement milk injection construction method involves the steps of ground excavation, cement milk injection and pile erection at the same time. Since it is not carried out, it takes a lot of time for construction, the borehole wall is likely to collapse, and it is difficult to add piles. Therefore, it is unsuitable for coping with the tendency of lengthening piles in recent years. On the other hand, the latter medium excavation method disturbs the ground where the pile should be installed with an auger, so the peripheral frictional force between the pile's outer periphery and the ground is lost, and the slime, which is the shavings of the excavated soil, is sufficiently treated. However, there is a problem that the ground at the tip of the pile softens due to the accumulation of slime, and as a result, sufficient bearing capacity cannot be expected compared to the impact construction method.

[Means for solving problems]

The present invention solves the above-mentioned problems of the prior art, and provides a method of constructing a pile foundation that is vibration- and noise-free at the time of construction, is surely constructed, and is stable, and an apparatus used for this construction method. The purpose of this construction method is to construct a cylindrical gear with a bottomed cylindrical shape with excavation claws on the back side of the bottom plate and screws on the outer periphery at the position where the pile is to be driven. , The distal end of the hollow concrete pile is freely rotatably fitted in the hollow body, the rotary rod is inserted into the hollow concrete pile, and the rotary rod is engaged with the hollow body by appropriate means. It is characterized in that by imparting rotation to and rotating only the gear body, it is advanced by the excavating claw and screw of the gear body, and is sunk without rotating the pile. Carry out construction method The device for this purpose has a cylindrical shape with a bottom, and a plurality of excavating claws are radially mounted on the back surface of the bottom plate, screws are fixed around the outer circumference of the cylinder, and a circular hole is provided in the center of the bottom plate. A cross-shaped earth and sand stopper is arranged inside, a flanged cylinder having a circular cavity is provided at the center of the upper surface of the bottom plate, and a rectangular through hole is formed in the upper part of the cylinder that is appropriately separated from the flanged cylinder. A partition plate having a lower guide member is provided on the back surface of the partition plate downward in the long side direction of the through hole, and an upper guide member is provided on the front surface upward in the long side direction of the through hole. Between the upper surface of the bottom plate and the rear surface of the partition plate, the flange of the flanged cylinder is cut so as to be symmetrical about an equilateral mountain-shaped clasp whose apex is located at the center of the two long sides of the through hole. And the upper ends of them are welded to the back surface of the partition plate, A tubular gear body that is rotatably fitted to the tip of the uncle pile and a rod having a built-in water guide tube, which has a water guide hole communicating with the water guide tube, is provided with a recessed part at the lower end, and the recessed part is A fitting cylinder equipped with an on-off valve made of rubber or the like capable of closing the water guiding hole is integrally provided continuously, and the fitting cylinder has a length larger than the diameter and a width smaller than the diameter and a rectangular hole of the partition plate. Is provided with an operating plate having a through hole that can be inserted in the longitudinal direction and communicates with the water guiding hole, and the operating plate is engaged with the clasp of the lever body so as to integrally rotate the channel body. And a rotating rod.

[Operation of the invention]

That is, the present invention, the bottom end of the hollow concrete pile is loosely fitted to the bottomed cylindrical trough provided with a screw on the back surface of the bottom plate and provided with a screw on the outer periphery, and the rotary rod is inserted into the pile. A rotating rod is engaged with the above-mentioned lever body, the rotating rod is rotated to rotate the lever body, and the concrete pile is sunk by excavating with the nail and screw for excavating the lever body. In addition, the concrete pile can be sunk without the disadvantages of the cement milk method and the hollow excavation method.

〔Example〕

Next, an embodiment of the method of the present invention will be described with reference to an example of the device of the present invention.

In the figure, reference numeral 1 is a bottomed cylindrical shoe body, in which a plurality of excavating claws 3 are radially mounted on a back surface of a bottom plate 2 and a cylindrical portion 4 is provided.
A screw 5 having an outer diameter / pitch ratio in the range of 1: 0.3 to 1: 0.8 is wound and welded around 1.0 to 2.5 turns around the outer circumference of the. Reference numeral 6 denotes a circular hole provided in the central portion of the bottom plate 2.
A cross-shaped earth and sand stopper 7 is provided inside. 8 is a flanged cylinder having a circular space 8b provided at the center of the upper surface of the bottom plate 2, 8a
Is a collar, and 9 is a partition plate disposed in an upper portion of the tubular portion 4 and appropriately separated from the flanged cylinder 8, and a substantially rectangular through hole 10 is provided in the central portion.

Reference numerals 11 and 11 denote equilateral mountain-shaped clasps, which are arranged between the upper surface of the bottom plate 2 and the rear surface of the partition plate 9 with their vertices positioned at the centers of the two long sides of the through hole 10, and are symmetrical about the center. As described above, the flange 8a of the flanged cylinder 8 is cut and welded, and the upper end portions thereof are welded to the back surface of the partition plate 9.

12 is a lower guide member provided on the back surface of the partition plate 9 downward in the long side direction of the through hole 10, and 13 is provided on the front surface of the partition plate 9 in the long side direction of the through hole 10 upward. The upper guide members 14 and 15 provided are stoppers provided at positions on both outer side surfaces of the stoppers 11 and 11 that come into contact with the lower portion of the lower guide member 12, respectively. A stopper to prevent the operating plate from slipping out during rolling
Similarly, 15 is for preventing the working plate from coming out during reverse rotation, and 16 is an O provided on the inner wall of the flanged cylinder 8.
The ring fitting groove constitutes the tubular gear A as described above.

Reference numeral 21 is a rod containing a water conduit 22 and 23 is a fitting cylinder connected to the rod 21 and has a water guiding hole 24 communicating with the water guiding tube 22 and a concave portion 25 is provided at the lower end and the concave portion 25. Further, an on-off valve 26 made of rubber or the like capable of closing the water guiding hole 24 is attached.
Reference numeral 27 denotes an operating plate provided on the fitting cylinder 23, which has a length larger than the diameter of the fitting cylinder 23 and a width smaller than the diameter, and can be inserted in the longitudinal direction of the rectangular through hole 9 of the partition plate 8. A through hole (not shown) communicating with the water guiding hole 24 is also provided, and 28
Is an O-ring fitting groove provided on the outer periphery of the lower end side of the fitting cylinder 23.
The ring 29 is fitted to seal the surface with the flanged cylinder 8, and the rotary rod B is constituted by the above 21 to 28. The rotary rod has the fitting cylinder 23 of the shaft A. Through hole
When the rod 21 is rotated by placing the lower end on the bottom plate 2 of the trough A through the 10 and the circular space and rotating the rod 21, both ends of the operating plate 27 in the longitudinal direction are engaged with the clasps 11, 11 of the trough A. Then, the gear body A is integrally rotated.

A device for the concrete pile foundation construction method of the present invention is constituted by the above-mentioned trough A and the rotating rod B. The construction method using this equipment will be explained as follows.

First, the trough body A is installed at a position where a pile is to be piled up, the rotary rod B is inserted into the hollow concrete pile C to be piled up, the rod 21 of the rotary rod B is temporarily fixed to the pile C, and the pile is piled up. Lubricant such as synthetic resin is applied to the outer periphery of the tip of C for a required length to fit into the trough A, and the tip is placed on the partition plate 9, and the rod 21 is mounted on the rotary machine D of the pile driver. After coupling, the rotating rod B has its own weight and the rotating machine D.
And the tip of the fitting tube 23 is lowered by the weight of
When the operating plate 27 penetrates through the through hole 10 and passes through the through hole 10, the operating plate 27 passes through the through hole 10 along the upper guide plate 13, and the fitting cylinder 23 fits into the flanged cylinder 8. To do. When the rotating rod B is rotated in the forward direction, the operating plate 27 stops.
Since it comes into contact with the stopper 11 which is slightly below 14 and is in an engaged state, if the rotating rod B is further rotated in the forward direction in this state,
The drill body A rotates integrally with the rotating rod B, the excavating claw 3 and the screw 5 of the drill body A excavate while removing nearby sediment, and the pile C sinks. Since a lubricant is present in the gap between the lower end of the pile C and the tubular portion 4 of the trough body A, the pile C sinks at a stationary or co-rotating position, and when the excavation proceeds to a predetermined depth, the head of the pile C is reached. Check the dynamic supporting force of the pile C by striking the part with a weight etc. about 10 times. If the above method cannot be adopted due to the location, by injecting cement milk from the water conduit 22 while rotating the gear body A to solidify and strengthen the ground,
It can be a pile built in stable ground.

In the excavation work, if necessary, pressure water, cement milk, or the like is pressure-fed from the water guide pipe 22 and jetted from the circular hole 6 to soften the ground to perform the work.
Work can be progressed smoothly.

Further, if it is necessary to pull out the pile C for some reason during driving of the pile C, when the rotating rod B is rotated in the reverse direction, the operating plate 27 is provided with the clasp 11 slightly below the stopper 15 in the reverse direction. If the rotary rod B is further rotated in the reverse direction while being in contact with the pile C, the pile C can be gradually pulled up.

When the driving work of the pile C is completed as described above,
When the rotating rod B is rotated in the forward rotation direction in the forward rotation and in the forward rotation direction in the reverse rotation while being pulled up while rotating about 45 degrees, the operating plate 27
Rotates together with the rotary rod B and separates from the rectangular through hole 10 along the lower guide member 12 of the gear body A, and the gear body A and the rotary rod B are separated from each other. Then, the rotating rod B can be pulled up. For this purpose, the working plate 27 is provided over the entire circumference of the rod 21.
It is extremely convenient to operate if a mark for the mounting direction is provided.

On the other hand, in the pile C, as described above, the lubricant is present in the gap between the tip portion of the pile C and the inner wall of the tubular portion 4 of the trough A, and the lubricant solidifies and adheres with the passage of time. The gear body A is integrated or integrated and is stable. In addition, the trough A is buried as it is.

Furthermore, in the present invention, after driving one pile C,
It is also possible to add the next pile.

〔The invention's effect〕

The present invention is as described above, in which the tip of the concrete pile is loosely fitted into a gear body provided with an excavating claw and a screw, a rotary rod is engaged with the gear body, and the ground is advanced by rotating the rotary rod. However, because the concrete piles are allowed to sink, the burying efficiency can be increased by the synergistic action of the thrust of the pile body and the rotation of the sill body, and vibration and noise do not occur as in the past. The problems of the cement milk method and the medium excavation method can be solved, and piles can be added, and stable pile driving work can be performed with no pollution.

Moreover, since the upper guide member is provided on the front surface of the partition plate and the upper guide member is provided on the rear surface thereof, the fitting cylinder can be easily and surely attached to and detached from the trough body.
In addition, since it is a type that allows the pile body to be freely freely fitted into the tubular gear, there is no risk of misalignment as compared with the conventional joint integrated type, so excavation by rotation of the gear body,
The power required for propulsion can be used efficiently.

[Brief description of drawings]

FIG. 1 is a front view showing a state in which the devices are combined before construction, FIG. 2 is a front view showing a state during construction, FIG. 3 is a sectional view of a rotary rod equipped with a fitting cylinder, and FIG. Fig. 5 is a front view of the right half of the gear body in section, Fig. 5 is a front view of the right half in the state of combining the gear body, piles and rotating rods, and Fig. 6 is a bottom view of Fig. 5; The figure is a sectional view taken along line VII-VII in FIG. A ... Shaft body, 1 ... Shaft body, 2 ... Bottom plate, 3 ... Excavation claw, 4 ... Cylindrical part, 5 ... Screw, 6 ... Circular hole, 7 ...
… Sand stoppers, 8 …… Cylinder with collar, 9 …… Separator, 10…
… Rectangular through hole, 11 …… Mounted clasp, 12 …… Lower guide member, 13 …… Upper guide member, 14,15 …… Stopper, 16
…… O-ring groove, B …… Rotary rod, 21 …… Rod, 22 …… Water pipe, 23…
… Mating cylinder, 24 …… Water guide hole, 25 …… Concave part, 26 …… Opening / closing valve, 27 …… Operating plate, 28 …… O ring groove, 29 …… O ring, C …… Hollow concrete pile, D ... Rotating machine for pile driver

Claims (3)

[Claims] Claims: 1. At the position where piles are to be piled, a cylindrical trough with a bottomed cylindrical shape with an excavating claw attached to the back of the bottom plate and a screw provided on the outer periphery is installed, and the hollow concrete pile of the hollow concrete pile is placed in the trough. The tip part is freely rotatably fitted, the rotary rod is inserted into the hollow concrete pile, and the rotary rod is engaged with the lever body by appropriate means, and the rotary rod is rotated to provide only the lever body. A concrete pile foundation construction method characterized in that the concrete pile foundation is constructed by rotating the pile to advance it with a claw for excavation and a screw of the trough body, and digging the pile without rotating it. 2. The concrete pile foundation construction method according to claim 1, wherein the rotary rod has a built-in water pipe and the pressure water, cement milk, or the like is pumped into the ground as needed to advance the concrete. 3. A bottomed cylindrical shape having a plurality of excavating claws radially mounted on the bottom plate rear surface, a screw being wound and fixed on the outer periphery of the cylindrical portion, and a circular hole is provided in the center of the bottom plate, and the circular hole is provided in the circular hole. A cross-shaped earth and sand stopper is provided, a flanged cylinder having a circular cavity is provided in the center of the upper surface of the bottom plate, and a rectangular through hole is provided in the upper portion of the bottom plate, which is appropriately separated from the flanged cylinder. The bottom plate is provided with a plate and a lower guide member is provided on the rear surface of the plate downward in the long side direction of the through hole, and an upper guide member is provided on the front surface of the plate upward in the long side direction of the through hole. And welding the cylindrical flange with the flange so as to be symmetrical about the equilateral mountain-shaped clasp with the apex located at the center of the two long sides of the through hole between the upper surface of the plate and the back surface of the partition plate. And the upper ends of them are welded to the back surface of the partition plate to form a hollow concrete A tubular gear body that is rotatably fitted to the tip portion of the toe pile, and a rod having a built-in water guide tube, which has a water guide hole communicating with the water guide tube and is provided with a recessed portion at the lower end thereof. A fitting cylinder equipped with an on-off valve made of rubber or the like capable of closing the water guiding hole is integrally provided continuously, and the fitting cylinder has a length larger than the diameter and a width smaller than the diameter and a rectangular hole of the partition plate. Is provided with an operating plate having a through hole that can be inserted in the longitudinal direction and communicates with the water guiding hole, and the operating plate is engaged with the clasp of the lever body so as to integrally rotate the channel body. An excavator for a concrete pile foundation method, which comprises a rotating rod.