JP2003147770A - Pile burying construction method and its device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase extracting resistance force of a pile intruded and buried without removing earth. SOLUTION: A spiral blade 12 is arranged on the outer periphery of a cylindrical body 11 in a lower end part of a ready-made hollow pile 1, a jacking head 10 for arranging an excavating blade 16 in a tip part is rotatably fitted, a rotary rod 20 inserted into a pile hollow part is engaged with the jacking head 10, and while rotating the jacking head 10 by the rotary rod 20, the pile 1 is made nonrotatable, and intrusion is advanced by the screwing-in action by the spiral blade 12. After intruding the pile 1 in the prescribed depth, the rotary rod 20 is pulled up, and cement milk and mortar or ready-mixed concrete are injected into the pile hollow part, and a lower part of the pile 1 and the jacking head 10 are integrally joined.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention provides hollow piles with low noise,
The present invention relates to a method of burying efficiently with low vibration and no soil, and a device used for this method.

[0002]

2. Description of the Related Art Conventionally, in order to bury a ready-made pile in the ground with low noise and low vibration, a pre-boring method in which a buried hole is excavated and a pile is inserted into the hole,
The earth excavation method is used in which the earth auger is inserted into the hollow portion of the pile to excavate the ground and the earth and sand are discharged through the hollow portion of the pile to bury the pile. However, in any of these construction methods, a large amount of excavated soil is discharged, which loosens the ground and reduces the frictional force on the peripheral surface of the pile, as well as the problem of securing a disposal site for treating the soil and a large transportation cost. It has a problem of cost.

In addition, instead of the above construction method, there is also a construction method in which a pile provided with a spiral wing on the outer periphery is used and the pile is screwed in. However, in this construction method, the pile is pushed into the ground while rotating. Since the friction force between the pile and the soil is large, even if it is possible with a short object, the rotation force given to the pile head by the friction force of the soil is piled in the pile of the normal length or the long pile. It is difficult to be transmitted to the lower end, and a large torsional moment acts on the pile, which may damage or cut the pile.

Therefore, at the lower end of the hollow pile to be buried,
A propulsion head equipped with spiral blades and excavating blades is rotatably provided, and is rotated by a rotary head inserted in the hollow part of the pile, and the pile is pushed non-rotatably into the ground to produce no soil and pile. A construction method has been developed that enables the embedding of long objects without the risk of torsional moments.

[0005]

With this developed method, it is possible to exert sufficient proof stress to support the load from the upper part, but conversely, if pulling force acts on the pile due to earthquake or wind pressure, Since it depends on the peripheral frictional force of the pile and the weight of the pile and the weight of the foundation (footing), the pull-out resistance is insufficient.

The present invention has been made to solve the problems of the above-mentioned method of burying a pile using a propulsion head. After burying the pile using a propulsion head, the pile is propelled with cement milk or ready-mixed concrete. By integrating the head and pile, the resistance of the spiral blade protruding from the propulsion head can also be used as pull-out resistance force, the hollow pile can be buried with low noise, low vibration and no soil, An object of the present invention is to provide a construction method and a device used therefor capable of sufficiently supporting load and pulling out resistance force.

[0007]

The structure of the present invention for achieving the above object will be described with reference to the accompanying drawings. The method of burying a pile according to claim 1 is the lower end portion of the hollow pile 1. In addition, a spiral blade 12 is projected on the outer circumference, and a propulsion head 10 provided with a drilling blade 16 at its tip is rotatably fitted, and a rotary rod 20 inserted in the hollow portion of the pile is engaged with the propulsion head 10. Then, after rotating the propulsion head 10 into the ground so as to rotate it so that the hollow pile 1 does not rotate,
The mortar 25 is injected into the hollow pile 1 and the hollow pile 1
It is characterized in that the lower part of the and the propulsion head 10 are integrally connected.

In the pile burying device according to the second aspect, the hollow pile 1, the propulsion head 10 rotatably fitted to the lower end of the hollow pile 1, and the hollow head of the hollow pile 1 are inserted. The hollow pile 1 is provided with a connecting auxiliary bar 7 projecting into the hollow portion at the lower end thereof, and the propulsion head 10 is provided at the lower end of the hollow pile 1. A spiral blade 12 is provided around the outer periphery of a cylindrical body 11 having a bottom plate 13 that is rotatably fitted to the base plate 13 so as to extend around one turn. In addition, the bottom plate 13 is provided with a digging blade 16 on its lower surface, and the upper surface of the bottom plate 13 has a concavo-convex shape with a diameter smaller than the diameter of the hollow portion of the hollow pile 1 so that the rotary rod 20 can be inserted therethrough. An inner cylinder 18 is projected, and the rotary rod 20 is a hollow pile 1. The lower end of the rotating rod 20 which is formed longer Ri engaging piece that was the disengageably said engagement means
22 is provided.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show one embodiment of an embedding device used in the method of the present invention, and FIGS. 5 and 6 show one embodiment of the method of the present invention step by step.

The burial device used in the method of the present invention is
It is provided with a hollow concrete pile (hereinafter referred to as a pile) 1 to be buried, a propulsion head 10 rotatably fitted to a lower end portion of the pile 1, and a rotating rod 20 for rotating the propulsion head 10.

As shown in FIGS. 1 and 2, the pile 1 is provided with end plates 2 and 3 at its upper and lower ends, and
A reinforcing plate 4 is provided which is connected to the end plates 2 and 3 and surrounds the outer periphery of the concrete portion over a required length. Although not shown, in the concrete of the pile 1,
A shaft reinforcement and a spiral reinforcement having both ends connected to the end plates 2 and 3 are embedded. Then, in the pile 1 used in the present invention, a plurality of mounting ribs 5 of a required length are erected at intervals in the circumferential direction in the concrete at the lower end thereof, which are connected to the end plate 3. The attachment muscles 5 are connected by ring muscles 6,
Auxiliary connecting muscles 7 projecting into the hollow portion 8 of the pile 1 are connected to the ring muscles 6.

As shown in FIGS. 1 and 3, the propulsion head 10 has a spiral wing for screwing the outer periphery of a cylindrical body 11 formed to have a diameter such that the lower end of the pile 1 can be rotatably fitted on the lower end.
The bottom plate 13 is formed by projecting approximately 12 turns, and at the lower end of the cylindrical body 11, an engaging hole 14 having a substantially rectangular shape in a plane and engaging with a rotating rod 20 described later is formed at the center thereof. A wing plate 15 is provided on the lower surface of the bottom plate 13, and a plurality of digging blades 16 are provided on the wing plate 15, and an engaging hole 14 is formed at the center of the wing plate 15. A cutout recess 17 is provided subsequent to. Further, on the upper surface of the bottom plate 13, an inner cylinder 18 having a larger diameter than the engaging hole 14 and smaller than the diameter of the hollow portion 8 of the pile 1 and having irregularities formed by a striped steel plate or the like is erected.
Further, an insole plate 19 having good slidability is laid on the bottom plate 13 between the cylindrical body 11 and the inner cylinder 18.

The rotating rod 20 is, as shown in FIGS.
A rod that is a hollow tube with a bottom and is formed sufficiently longer than the pile 1
At a lower end portion of 21 is provided an engaging piece 22 that is engaged with the engaging hole 14 and has substantially the same shape as the engaging hole 14. Further, its upper end portion can be coupled to an auger drive device (not shown).

The construction method of the present invention is carried out using the above-mentioned burying device. First, as shown in FIG. 5 (a), the propulsion head 10 is placed on the ground A, and the pile 1 and the rotary rod 20 inserted into the pile 1 are hung down.
(B) As shown in Fig. 1, the lower part of the pile 1 is the propulsion head.
The pile 1 is placed between the cylindrical body 11 and the inner cylinder 18 of 10 to mount the pile 1 on the insole plate 19, and the engaging piece 22 at the lower end of the rotating rod 20 is used as the engaging hole of the bottom plate 13. Mate and stand upright,
The upper end of the pile 1 is connected to a hanging device (not shown) for pile driving and the upper end of the rotating rod 20 is connected to an auger drive device (not shown).

In this state, if the auger drive device is activated and the rotating rod 20 is rotated, the rotational force is generated by the propulsion head.
The propulsion head 10 penetrates into the ground by the propelling action by screwing the spiral blade 12 into the ground while the ground is excavated by the excavating blade 1 at the tip of the propelling blade 10. At that time, the pile 1 penetrates into the ground together with the propulsion head 10 without rotating. In this case, the earth and sand excavated and fluidized by the excavating blade 1 are pushed in the outer peripheral direction of the propulsion head 10 as the propulsion head 10 penetrates, and are compacted to the surrounding ground.

In this penetration work, if the weight of the pile 1 is applied to a certain degree so that the pile 1 does not separate from the propulsion head 10 in accordance with the penetration of the propulsion head 10, the propulsion effect of the spiral blade 12 is good. However, when the weight is applied to a large degree, friction between the lower end surface of the pile 1 and the propulsion head 10 becomes large, and a large amount of rotational power is required.

The penetration of the pile 1 is carried out until the propulsion head 10 is sufficiently penetrated into the support layer B as shown in FIG. 5 (c). If the penetration depth is deeper than the length of the pile 1, the conventional method is used. The pile 1 and the rotary rod 20 are added in the same manner as in (1). At the end of the penetration construction, as in the conventional construction, a Yatco pile (not shown) is attached to the upper end of the pile 1 to advance the penetration, and the upper end of the pile 1 is aligned with a predetermined position. And
After finishing the penetration, disconnect the Yatco pile and
Remove the pile 1 from the lifting device and then
As shown in (c), the rotating rod 20 is detached from the propulsion head 10 and pulled up.

After that, as shown in FIGS. 5 (d) and 6,
Cement milk, mortar or ready-mixed concrete (hereinafter referred to as mortar) 25 is injected (thrown) into the hollow portion 8 of the pile 1, whereby the mortar 25 is propelled by the propelling pile 10.
Inside the uneven inner cylinder 18 and the uneven inner cylinder 18 and the auxiliary muscle 7
The gap between the pile 1 and the projecting pile 1 is also filled, and the pile 1 and the propulsion pile 10 are integrally and firmly bonded via the mortar 25. As a result, even when the pulling force acts on the pile 1, the pulling resistance force is greatly increased by the resistance of the spiral blade 12 of the propulsion pile 10 in addition to the peripheral frictional force of the pile 1.

The rotary rod 20 may be provided with a jet hole at its tip, and when the rotary rod 20 is pulled up, cement milk or mortar may be injected from the jet hole. Moreover, during the penetration of the pile 1, water, air, cement milk or the like can be appropriately injected as necessary. If water or air is injected, the frictional resistance at the time of penetration can be reduced and the penetration can be promoted, which is particularly effective for the penetration of long piles. It is also possible to inject it when the pile 1 hits a hard formation or a highly viscous formation in the middle of penetration.

[0020]

As described above, in the construction method of the present invention, the lower end of the hollow pile is fitted with the propulsion head having the spiral blade and the excavating blade, and the propulsion head is rotated to penetrate the pile non-rotatably. By doing so, the pile can be buried in the ground with low noise, low vibration, and no soil by excavating and advancing by the propulsion head. And, since the pile is made to penetrate by screwing the propulsion head without giving rotation, the pile does not receive a torsion moment, there is no danger of damaging the pile, and it is easy to embed a long pile. You can do it well. Further, the labor for carrying out the remaining soil can be saved, and the pile construction can be economically performed.

The buried pile is integrally connected to the propulsion head by the mortar filled therein, and further, a connecting auxiliary bar is projected in the lower part of the pile and the propulsion head is uneven. Since the inner cylinder with a ridge is erected, the binding force of the mortar between the pile and the propulsion head is excellent. Therefore, even if the pulling force acts on the pile, in addition to the large peripheral frictional force due to the penetration construction using the propulsion head, a large pulling resistance force can be obtained due to the resistance of the spiral blade of the propulsion head. .

[Brief description of drawings]

FIG. 1 is a front view of a half section showing an embodiment of a pile burying device.

FIG. 2 shows an embodiment of a hollow pile.
Is a front view of a half section, and (b) is a plan sectional view.

FIG. 3 shows an embodiment of a propulsion head,
(A) is a sectional front view, and (B) is a plan view.

FIG. 4 shows an embodiment of a rotating rod, which includes (a)
Is a front view and (b) is a plan view.

5 (a), (b), (c), and (d) show one embodiment of the method of the present invention in the order of steps.

FIG. 6 is a front view of a half section showing a state in which the hollow pile and the propulsion head are joined together by concrete.

[Explanation of symbols]

1 hollow pile End plate 5 Attachment 6 ring muscle 7 Auxiliary muscle for connection 8 hollow 10 propulsion head 11 cylindrical body 12 spiral wings 13 Bottom plate 14 Engagement hole 15 wings 16 drilling blade 18 inner cylinder 20 rotating rod

【Figure 1】 21 rod 22 Engaging piece 25 Mortars

Claims (2)

[Claims] 1. A hollow rod is provided with a spiral blade projecting on the outer periphery at the lower end thereof, and a propulsion head provided with an excavating blade at the tip end thereof is rotatably fitted to propel a rotary rod inserted in the hollow portion of the pile. After engaging the head and inserting the mortar into the hollow pile while rotating it like screwing the propulsion head into the ground, mortar is injected into the hollow pile and the lower part of the hollow pile and the propulsion head are integrated. Burying method for piles, which is characterized in that they are mechanically connected. 2. A hollow pile comprising a hollow pile, a propulsion head rotatably fitted to the lower end of the hollow pile, and a rotating rod which is inserted into the hollow portion of the pile to rotate the propulsion head. , A connecting auxiliary bar is provided so as to project into the hollow portion of the lower end portion thereof, and the propulsion head spirally fits around the lower end portion of the hollow pile rotatably around the outer circumference of a cylindrical body having a bottom plate. Wings are projected,
The bottom plate is provided with an engaging means for engaging with the rotating rod at the center thereof, and a drilling blade is projectingly provided on the lower surface of the bottom plate, and the upper surface of the bottom plate has a diameter smaller than that of the hollow portion of the hollow pile. A protruding inner tube having a diameter that allows the rotating rod to be inserted, and the rotating rod is detachable from the engaging means at the lower end of the rotating rod formed longer than the hollow pile. The pile burying device is characterized in that the engaging piece is provided.