JP5187968B2 - Ready-made pile burial equipment and burial method - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a ready-made pile embedding device and method, and in particular, when a ready-made pile is buried in a buried hole in a pre-boring method, a ready-made pile support for supporting a ready-made pile in a suspended state until cement milk is solidified. It is related with the burying apparatus and the burying method of the ready-made pile which have the characteristics in.

When burying ready-made piles in the pre-boring method, the bottom of the buried hole formed by excavating and excavating the ground is further drilled with an enlarged wing to form a large-diameter buried hole for consolidation, for example, soil cement Cement milk such as (concrete) is built, and a ready-made pile is inserted into the buried hole and buried.
If the ready-made pile is directly installed on the built cement milk in the process of burying the ready-made pile, the ready-made pile may sink into the soil cement by its own weight. Therefore, it is necessary to prevent the ready-made piles from self-sinking until the soil cement is solidified. For this reason, an apparatus for supporting the ready-made piles in a suspended state is known (see Patent Document 1).
The ready-made pile self-sediment prevention device described in Patent Document 1 has a plurality of rotating metal fittings protruding radially at the upper end of a pre-made pile inserted into a buried hole, and the rotating metal fitting is attached to a rod for suspension. The ready-made pile cap is fixed after the concrete for solidification has been solidified by engaging it in a state where it is rotated and locked in a locking groove opened at the lower end of the ready-made pile cap attached to the lower end of the pile. Is rotated in the direction opposite to the engaging direction to remove the rotating metal fitting from the locking groove.

Further, although not described in the patent literature, FIG. 7 is a side sectional view schematically showing a ready-made pile and its supporting mechanism shown for explaining the embedding of the ready-made pile in the conventional pre-boring method. .
As shown in FIG. 7, in the conventional method of burying a pre-made pile, the pre-made pile 10 provided with a thick plate-like iron rotating bracket 12 welded or bolted to the upper end portion via an iron attachment ring (not shown) On the other hand, a rotary cap 20 is attached to the lower end of a rotary shaft (excavation shaft) 30 of an excavator excavating the buried hole, for example, an earth drill, and the rotary cap 20 and the rotary fitting 12 are detachably engaged. The ready-made pile 10 is inserted into the buried hole while rotating the rotating cap 20, and hence the rotating metal fitting 12, and the ready-made pile 10 in a state where both are integrated. Then, when the ready-made pile 10 reaches a predetermined embedding position, the rotation is stopped, and the ready-made pile 10 is maintained in a suspended state so as not to sink into the cement milk built in the embedding hole.
In this state, it waits for cement milk (for example, soil cement) to solidify, and when solidified, the engagement between the rotating cap 20 and the rotating metal fitting 12 is released.

Meanwhile, the excavator is used as a crane that simply supports the ready-made pile 10 and cannot perform any other work. In addition, it is conceivable to use a Yatco ready-made pile as another means for supporting the ready-made pile in a suspended state, but such operations as preparing the Yatco ready-made pile and attaching the Yatco ready-made pile are added.
Therefore, in the conventional method and apparatus, there is a problem that it takes time and cost to bury the ready-made pile, and therefore the construction efficiency is not good.

No. 6-3868

  The present invention has been made to solve the above-described conventional problems, and the purpose thereof is to maintain the suspension of the ready-made pile without using external equipment when the ready-made pile is buried in the pre-boring method. This is to reduce the burial cost of ready-made piles and improve the work efficiency.

The invention of claim 1 is a prefabricated pile embedding device for embedding in an embedding hole having cement milk built at the bottom, and projects outward from the upper end of the premade pile , a rotating bracket soil in and supported the prefabricated pile of a plurality of hanging supportable around a rotating cap with the rotary bracket and disengageably engaging portion, a driving means for rotating the rotary cap The rotating metal fitting suspends and supports the ready-made pile at an embedded position in the embedded hole.
According to a second aspect of the present invention, in the ready-made pile embedding device according to the first aspect, the rotating metal fitting rotates together with the rotating cap to excavate the ground surrounding the embedding hole.
According to a third aspect of the present invention, in the ready-made pile embedding device according to the first aspect, the rotating cap includes a spiral wing on a peripheral wall thereof.
The invention according to claim 4 is the ready-made pile embedding device according to claim 3, wherein the starting end of the spiral blade is the same height as the rotation bracket when the rotation cap and the rotation bracket are engaged. It is characterized by being set to.
The invention of claim 5 is a method for burying a ready-made pile embedded in a buried hole in which cement milk is built at the bottom, and projects outward from the upper end of the ready-made pile, and the buried hole is embedded in the buried hole. the rotary bracket soil in and supported the prefabricated pile of a plurality of hanging can support around the steps of engaging integral to the rotary cap, embedding position of the inlay cavity of the prefabricated pile by rotating the rotary cap And a step of suspending and supporting the ready-made piles by the plurality of metal fittings for rotation at the embedded position.
According to a sixth aspect of the present invention, in the method for burying a ready-made pile according to the fifth aspect, the rotating bracket rotates together with the rotating cap to excavate the ground around the buried hole.
The invention according to claim 7 is the method for burying a ready-made pile according to claim 5, characterized in that it includes a step of excavating the ground surrounding the buried hole with a spiral blade provided on the peripheral wall of the rotating cap that rotates. .

In the pre-boring method, the ready-made pile can be maintained in a suspended state in the buried hole filled with the soil cement for root consolidation without using external equipment, and can be prevented from falling.
Therefore, construction efficiency on site can be improved.

It is a front view which shows the whole embedment apparatus (cross section) of the 1st Embodiment of this invention. It is a perspective view of the upper surface of the ready-made pile shown in FIG. It is a perspective view of the rotation cap attached to the lower end of the rotating shaft of the rotary device for excavation (auger drive machine). It is a figure which shows the state (cross section) which laid the ready-made pile. It is a front view which shows the whole burying apparatus (cross section) of the ready-made pile of 2nd Embodiment. FIG. 6A is a perspective view illustrating an engagement portion between a rotating cap and a ready-made pile according to the second embodiment, and FIG. 6B is a plan view of the rotating cap. It is a front view which shows the conventional ready-made pile rotation insertion apparatus (cross section).

DESCRIPTION OF EMBODIMENTS An embodiment of a ready-made pile embedding device according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a front view showing the entire prefabricated pile embedding device according to the first embodiment of the present invention, FIG. 2 is a perspective view of the top surface of the prefabricated pile, and FIG. 3 is a rotating shaft of an excavating rotating device (auger drive machine). It is a perspective view of the rotation cap attached to the lower end of.
The basic structure of the ready-made pile embedding device according to this embodiment is the same as the conventional ready-made pile embedding device already described. That is, a plurality of rotating metal fittings 12 attached to the upper end portion of the ready-made pile 10 and extending outward, a rotating cap 20 detachably engaged with the rotating metal fitting 12, and a drive for driving the rotating cap 20 It consists of a rotating shaft of an excavator, for example. When burying a ready-made pile using this burying device, cement milk (for example, soil cement) 42 is built at the bottom of the buried hole 40 excavated in advance. On the other hand, the rotating metal fitting 12 is welded to the upper end surface of the ready-made pile 10 outwardly in the radial direction, and is integrally connected. Removably engages the attached rotating cap.

  The rotating metal fitting 12 is the same as the conventional one in that it is welded to an iron attachment ring 14 having a predetermined width attached to the upper end surface of the ready-made pile 10. However, as shown in FIGS. 2 and 3, the rotating metal fitting 12 has an outer end longer than the conventional rotating metal fitting 12, and when the ready-made pile 10 is inserted into the embedding hole 40, It is formed in the length which mounts on the ground, and is different from the conventional one in that point, and has a feature in that point as will be described later.

The structure of the rotating cap 20 is the same as that of the conventional one, and as shown in FIG. 3, it is detachably attached to the lower end of the rotating shaft 30 of the excavating rotating device by any means. That is, the rotary cap 20 is formed integrally with the upper surface iron plate 20a and the peripheral edge of the upper surface iron plate 20a so as to form a recess for accommodating the head of the ready-made pile 10, and the peripheral wall formed of the same iron plate. It consists of 20b. The peripheral wall 20b includes a groove opening 24a at the lower end of the peripheral wall 20b, a guide portion 24b extending upward from the groove opening 24a, and a locking portion formed in the horizontal direction following the guide portion 24b. A locking groove 24 made of 24c is cut out. The locking groove 24 is formed to have a width capable of engaging with the rotating metal fitting 12 attached to the ready-made pile 10.
Therefore, after aligning the ready-made pile 10 and the rotation cap 20, the metal fitting for rotation 12 attached to the upper end surface thereof is inserted into the locking groove 24 from the opening 24a of the locking groove 24 along the guide portion 24b. Then, by rotating the rotating shaft 30 in the clockwise direction in FIG. 3, the rotating metal fitting 12 can be introduced into the locking portion 24c.
Thereby, the metal fitting 12 for rotation, and thus the ready-made pile 10 and the rotation cap 20 are engaged and integrated. Further, by rotating the rotating shaft 30 in the reverse direction (counterclockwise), the engagement between the rotating metal fitting 12 and the rotating cap 20 can be released.

Next, using the ready-made pile embedding device having the above configuration, a procedure for embedding the ready-made pile 10 in the embedding hole 40 having a root-solidified portion on the bottom side and building cement milk (here, soil cement) 42. Will be described.
First, a buried ground 40 is formed by excavating and excavating desired ground with a rotating excavator (not shown). Next, the ground drill is pulled up while forming a large-diameter root consolidation portion in the excavated hole and injecting cement milk 42 into the buried hole 40.

  Next, instead of the ground drill of the excavator that has been lifted, the rotating cap 20 is attached to the lower end of the rotating shaft 30, and the locking groove opening 24 a at the lower end of the rotating cap 20 is used as the rotating bracket 12 of the ready-made pile 10. Align to. Thereafter, the rotating cap 20 is rotated simultaneously with the lowering, and the rotating metal fitting 12 is engaged with and integrated with the engaging portion 24c through the opening 24a and the guide portion 24b of the groove 24. Therefore, when the rotating shaft 30 is rotated, the end of the locking portion 20c of the rotating cap 20 comes into contact with the rotating metal fitting 12 to rotate the rotating metal fitting 12, and thus the ready-made pile 10, and the ready-made pile 10 is buried in that state. Insert into hole 40 and lower. When the tip end side of the rotating metal fitting 12 attached to the upper end of the ready-made pile 10 comes into contact with the ground around the buried hole 40, the ground around the buried hole 40 is excavated by the rotating metal fitting 12 for rotation, and according to the excavation. The ready-made pile 10 further descends in the buried hole 40.

  When the ready-made pile 10 descends to a predetermined position in the embedding hole 40 in which the soil cement 42 for consolidation is built (see FIG. 1), the rotation of the rotating cap 20 and thus the rotating metal fitting 12 is temporarily stopped, and then The rotating cap 20 is reversed to remove the rotating metal fitting 12 from the locking portion 24c, and then the rotating cap 20 is pulled up.

FIG. 4 is a view showing a state (cross section) in which a ready-made pile is buried.
The ready-made pile 10 separated from the rotary cap 20 is supported by the ground around the buried hole by the rotating metal fitting 12 and is kept suspended in a predetermined position (buried position) in the buried hole 40 as shown in the figure. Thereafter, the root cement soil cement 42 is solidified and embedded in the ground.

In this embodiment, since the rotating metal fitting 12 is provided with a function as a support for preventing the sinking of the excavating blade and the ready-made pile, the strength and length of the rotating metal fitting 12 are determined by the hardness of the surrounding ground and the ready-made pile. It is determined appropriately by its own weight. For example, it is conceivable to increase the number of rotating metal fittings 12, to form the rotating metal fittings 12 with a material having strength, or to make the shape of the rotating metal fittings 12 have a strong structure, that is, thicker or longer. However, in relation to the strength of the rotating bracket 12, when the ready-made pile 10 is placed in the rooting soil cement 42, it receives its buoyancy, so the load weight acting on the rotating bracket 12 is The structure and strength can be selected in consideration of the side because it is much reduced than the dead weight.
As described above, the rotating metal fitting 12 can be easily attached to the attachment ring 14 by welding or bolting in the field.

In the above embodiment, the rotating metal fitting 12 has a function as a ground excavating blade. However, depending on the ground, the rotating metal fitting 12 may not be excavated or may be difficult to excavate. Next, a second embodiment for application in such a case will be described.
FIG. 5: is a front view which shows the whole embedding apparatus of the ready-made pile of 2nd Embodiment. FIG. 6A is a perspective view showing an engagement portion between the rotary cap 20 and the ready-made pile 10 of the ready-made pile embedding device of the second embodiment, and FIG. 6B is a plan view of the rotary cap 20.
The rotary cap 20 according to the present embodiment, like the rotary cap 20 of the first embodiment, is a disc-shaped upper upper iron plate 20a that is detachably attached to the rotary shaft 30 of the excavating rotary device, and the upper iron plate 20a. It consists of a peripheral wall 20b having a predetermined vertical width formed integrally along the peripheral edge, and first, the same locking groove 24 as in the embodiment is formed on the peripheral wall.

  However, the rotating cap 20 of the present embodiment is different from that of the first embodiment in that the spiral blades 26 are attached to the peripheral wall 20b of the rotating cap 20. As shown in FIG. 6B, the spiral wing 26 has a circumferential length of at least one round around the rotation cap 20 avoiding the position of the locking groove 24 in plan view, divided into two, three or four (for rotation). The number of metal fittings 12) is shifted up and down, and is integrally joined to the peripheral wall by, for example, welding. Here, as shown in FIG. 5, the lower starting end of the spiral blade 26 is at the same level as the lower guide surface of the rotating bracket 12 of the locking portion 24c (position in the vertical direction of the peripheral wall 20b of the rotating cap 20). 5 and the width L1 thereof is a length L2 extending outward from the ready-made pile 10 of the rotating bracket 12 attached to the upper end of the ready-made pile 10, as shown in FIG. It is preferable to form it slightly longer.

In the second embodiment, since the rotary cap 20 is provided with the spiral blade 26 for ground excavation as described above, when the ground is hard and it is difficult to excavate with the rotary bracket 12, the strength of the rotary bracket 12 is the strength of the target ground. It can be used when it is not suitable for excavation.
That is, when the ready-made pile 10 is inserted into the buried hole 40, the ready-made pile 10 is suspended in the buried hole 40, and the rotating metal fitting 12 at the upper end comes into contact with the surface (ground) of the ground, the rotating cap 20 is removed. When rotating, the spiral blade 26 rotates, and at the same time, the rotating bracket 12 of the ready-made pile 10 descends with the cap 20 while rotating in the ground where the spiral blade 26 is crushed.

  When the cap 20 is lowered to a predetermined position in the embedding hole, the rotation of the rotating cap 20 is stopped. When the rotation of the rotating cap 20 is stopped, the starting end of the spiral blade 26 is at the same level as the lower surface of the locking portion 24c of the rotating metal fitting 12 as described above, so that the rotating metal fitting 12 is not crushed at the stop position. Supported by hard ground. Therefore, the ready-made pile 10 does not slide down by its own weight.

The spiral blade used in the present embodiment can also be attached to the peripheral wall 20b of the rotating cap 20 at the site, for example, by welding or the like (in some cases, attached by mechanical means such as bolts and nuts).
Therefore, similarly to selecting the rotating bracket 12 for the ready-made pile 10 according to the ground of the construction site, the spiral blades 26 are appropriately selected from those having a plurality of widths according to the rotating bracket 12 to be attached. Anything can be selected and attached to the rotating cap 20.
When the construction is completed, the rotating metal fitting 12 is left on the site together with the ready-made pile 10, but the spiral blade 26 can be reused as many times as it is removed after the rotating cap 20 is pulled up. Can do.

  If a plurality of types of rotating metal fittings 12 are prepared depending on their length and strength, the number and length of the rotating metal fittings 12 to be attached to the tip of the ready-made pile 10 depending on the ground condition at the construction site. You can decide. Further, depending on the ground, when excavation with the rotating metal fitting 12 is difficult, the spiral blade 26 can be easily attached to the rotating cap 20 by welding or the like. In that case, the width of the spiral blade 26 can be determined in consideration of the length of the rotating metal fitting 12.

According to the present embodiment, the spiral blades 26 attached to the rotating metal fitting 12 and the rotating cap 20 can of course be assembled in advance in a factory or the like, but not only that but can be determined and assembled on site, so Rotating metal fittings and spiral blades suitable for the field can be used. In addition, since the ready-made pile can be supported in the suspended state only by the metal fittings for rotation on the enlarged rooted part where the soil cement 42 is built without using an excavator or a Yatco ready-made pile, which is an external equipment, There is an advantage or feature that does not require any external equipment for hanging.
In addition, the rotating bracket 12 is the same type as that used in the past, and it is only necessary to extend the length a little, which is advantageous from a cost standpoint. As a result, the work efficiency can be improved because it is possible to proceed to the next work as it is.

  DESCRIPTION OF SYMBOLS 10 ... Ready-made pile, 12 ... Rotating metal fitting, 14 ... Mounting ring, 20 ... Rotation cap, 20a ... Upper surface iron plate, 20b ... Peripheral wall, 24 ... Locking groove, 24a ... opening, 24b ... guide part, 24c ... locking part, 26 ... spiral blade, 30 ... rotating shaft (of excavator), 40 ... buried hole.

Claims (7)

An embedded pile burying device embedded in a burial hole with cement milk built at the bottom,
A plurality of rotating metal fittings protruding outward from the upper end of the ready-made pile , supported by the ground around the buried hole in the buried hole, and capable of supporting the ready-made pile suspended in air,
A rotating cap provided with an engaging portion detachable from the rotating metal fitting;
Anda driving means for rotating said rotary cap,
The prefabricated pile embedding apparatus, wherein the rotating metal fitting suspends and supports the prefabricated pile at an embedding position in an embedding hole. In the ready-made pile embedding device according to claim 1,
The rotating pile is rotated together with the rotating cap to excavate the ground around the buried hole, and is a prefabricated pile embedding device. In the ready-made pile embedding device according to claim 1,
The rotary cap has a spiral wing on its peripheral wall, and is a ready-made pile embedding device. In the buried pile embedding device according to claim 3,
Beginning of the spiral blade, when said rotating cap that engages the rotary bracket, embedded devices already manufactured pile you characterized in that it is set to the same height as the said rotating bracket. It is a method of burying a ready-made pile that is buried in a buried hole in which cement milk is built at the bottom,
A plurality of rotating metal fittings protruding outward from the upper end of the ready-made pile and supported by the ground around the buried hole in the buried hole and capable of supporting the ready-made pile suspended in the air are integrated with the rotating cap. Process,
Placing said prefabricated pile embedded position of the inlay cavity by rotating the rotary cap,
A step of suspending and supporting the ready-made pile by the plurality of rotating metal fittings at the embedded position;
A method for burying a ready-made pile characterized by comprising: In the method for burying ready-made piles according to claim 5,
A method for burying a ready-made pile, comprising the step of excavating the surrounding ground of a buried hole by rotating the metal fitting for rotation together with the rotating cap . In the method for burying ready-made piles according to claim 5,
A method for burying a ready-made pile, comprising a step of excavating a ground surrounding a buried hole with a spiral wing provided on a peripheral wall of the rotating cap.

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