JP2017002493A - Method of burying pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of burying a pile that prevents the pile from wobbling relatively pliers when burying the pile with the pliers connected to a pile head of the pile.SOLUTION: A jack 13 consisting of a fixed part 13a, a movable part 13b and a hydraulic cylinder 13c is built in a steel pipe 11 to serve as pliers 10. When the pliers 10 are connected to a pile 20, the hydraulic cylinder 13c of the jack 13 is extended to bring the movable part 13b into contact with an upper surface of a pile head 21 of a pile 20. The hydraulic cylinder 13c is further extended and then the fixed part 13a of the jack 13 and the steel pipe 11 fixed thereto are pushed up by a reaction from the pile head 21. Consequently, a projection 22 of the pile 20 introduced into a lateral groove 12b of a cut 12 of the steel pipe 11 is pressed forcibly against a groove edge of the lateral groove 12b, thereby eliminating a clearance between the cut 12 and projection 22. The pliers 10 and pile 20 are tightly connected together without wobbling.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pile burying method.

  The pile head is covered with a steel pipe and connected to the pile head, lifted with a crane, inserted in advance into the embedding hole formed by the pile driver to the expected embedding depth, and when the insertion is completed, the yatco is removed from the pile. A pile burying method of separating and pulling up from a hole for burying by a crane is known.

As in Patent Document 1, as a connection structure between a pile and a Yatco, there is a structure in which a protrusion is provided on the outer periphery of the pile head, and an L-shaped notch including a vertical groove and a horizontal groove is provided on the outer periphery of a steel pipe to be a Yatco. .
The L-shaped notch of this Yatco has its longitudinal groove extending upward from the lower end of the steel pipe along the axial direction of the steel pipe, and its lateral groove extending from the upper end of the longitudinal groove along the circumferential direction of the steel pipe.
Lower the Yatco from the top of the pile and place it on the top of the pile, insert the protrusion of the pile into the longitudinal groove of the notch, then rotate the Yatco in the circumferential direction to guide the protrusion of the pile into the lateral groove of the notch Thus, the pile and the Yatco are connected.

JP-A-6-49855

  However, with the Yatco connected to the pile head in this way, there is play (gap) between the notch of the Yatco and the protrusion on the pile head. If the pile is inserted in an inclined state, it may cause a construction failure.

  Therefore, the problem to be solved by the present invention is to prevent the pile from wobbling with respect to the rattle when the pile is buried in a state where it is connected to the pile head of the pile.

In order to solve the above-described problems, in the pile embedding method of the present invention, a jack is built in a steel pipe to be a yatco.
And when connecting the Yatco to the pile, this jack is extended and the steel pipe is pushed up by reaction from the pile head of the pile, and the protrusion of the pile introduced into the transverse groove of the notch of the steel pipe is connected to the groove edge of the transverse groove ( It was pressed against the lower edge to eliminate play.

More specifically, the embedding method of the present invention includes the following steps.
Yatco, which consists of a steel pipe with a built-in jack, and has a notch made of a longitudinal groove extending in the axial direction from the lower edge of the steel pipe and a lateral groove extending in the circumferential direction of the steel pipe from the upper edge of the longitudinal groove on the lower outer periphery of the steel pipe And a step of preparing a pile having a protrusion on the outer periphery of the pile head.
The Yatco is lowered from above the pile, the protrusion of the pile is inserted into the longitudinal groove of the notch, and then the steel pipe of the Yatco is rotated in the circumferential direction to introduce the protrusion of the pile into the lateral groove of the notch. Process.
The process of pushing down the steel pipe by the reaction from the pile head of the pile by extending the jack of the Yatco, and pressing the projection of the pile against the groove edge of the notch transverse groove.
A step of suspending a pile connected to the Yatco and inserting the pile into a burial hole provided in advance in a planned burial site until reaching a planned burial depth.

  Moreover, in the pile burying method of the present invention, when separating the yatco from the pile, the jack is contracted to pull down the steel pipe, thereby separating the pile protrusion from the groove edge of the transverse groove of the steel pipe notch. It was decided.

Specifically, it is preferable that the embedding method of the present invention further includes the following steps.
The step of pulling down the steel pipe by contracting the jack of the Yatco and separating the protrusion of the pile that has been pressed against the groove edge of the lateral groove of the notch from the groove edge.
The step of rotating the Yatco steel pipe in the circumferential direction and then lifting it so that the protrusions of the pile escape from the notches.

  Furthermore, it is preferable to include a step of lifting the yatco while extending the jack jack separated from the pile and escaping from the embedding hole.

  Since the embedding method of the present invention is configured as described above, when connecting the Yatco and the pile, the jack is extended to forcibly press the protrusion of the pile against the groove edge of the notch of the steel pipe notch. The play between the protrusion and the lateral groove of the notch is eliminated, and the pile is prevented from wobbling with respect to the Yatco.

  In addition, when the Yatco is separated from the pile, the jack is contracted to force the pile protrusion to separate from the groove edge of the transverse groove of the steel pipe notch, thereby eliminating the catch between the notch and the protrusion. And the pile can be separated smoothly.

  In addition, when pulling up the Yatco separated from the pile from the hole for embedding, even if the pile and Yatco are abnormally in close contact with each other due to the excavated soil entering the gap between the pile and Yatco, the jack can be extended. The pile and the Yatco are forcibly separated, and the Yatco is prevented from rising together.

Schematic showing equipment used for pile burial method Schematic showing the connection process between Yatco and piles Schematic showing the connection process between Yatco and piles Schematic showing the connection process between Yatco and piles Schematic showing the connection process between Yatco and piles Schematic showing the pile burial process Schematic showing the pile burial process Schematic showing the pile burial process Schematic showing the pile burial process

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the pile embedding method according to the embodiment, each facility shown in FIG. 1 is used, and the step shown in FIGS. 2 to 5 is connected to the pile head and the case shown in FIGS. 6 to 9 is connected. Inserting the pile into the burial hole and then separating the Yatco from the stake to escape from the burial hole.

As shown in FIG. 1, in the pile embedding method of the embodiment, a yatco 10, a pile 20 and an auger 30 are prepared as main facilities.
The Yatco 10 includes a steel pipe 11 and a jack 13, and the steel pipe 11 has a structure similar to that of the prior art. Moreover, the pile 20 and the auger 30 also have the same structure as before.

The steel pipe 11 of the Yatco 10 has a notch on the outer periphery of the lower part thereof. The notch 12 is composed of a longitudinal groove 12a and a transverse groove 12b penetrating in the radial direction of the steel pipe, and has an L shape as a whole. A plurality of notches 12 are provided in parallel in the circumferential direction of the steel pipe 11.
The longitudinal groove 12a extends upward from the lower end of the steel pipe 11 along the axial direction of the steel pipe 11, and the lateral groove 12b is bent about 90 degrees from the upper end of the longitudinal groove 12a and is shown along the circumferential direction of the steel pipe 11 in the drawing. Extends to the right.
The jack 13 of the Yatco 10 is built slightly above the notch 12 of the steel pipe 11. The type and structure of the jack 13 are not particularly limited. In the illustrated example, the jack 13 includes a pair of upper and lower fixed portions 13 a and a movable portion 13 b, and the fixed portion 13 a is fixed inside the steel pipe 11.
The movable portion 13b is connected to the fixed portion via the hydraulic cylinder 13c, and can move up and down along the axial direction of the steel pipe 11 in accordance with the expansion and contraction of the hydraulic cylinder 13c accompanying the supply and discharge of oil through the hydraulic pipe 13d. It has become.

The pile 20 has a pile head 21 at the upper end thereof, and a protrusion 22 protruding in the radial direction of the pile is formed on the outer periphery of the pile head 21. A plurality of protrusions 22 are provided in parallel in the circumferential direction of the pile 20.
The shape of the protrusion 22 is not particularly limited, but is a prismatic shape in the drawing.
The protrusion 22 is formed in a size that can be inserted into the notch 12 of the steel pipe 11. In other words, the circumferential length of the pile 20 of the protrusion 22 is smaller than the groove width of the vertical groove 12 a of the notch 12, and the axial length of the pile 20 of the protrusion 22 is larger than the groove width of the lateral groove 12 b of the notch 12. Is also formed small.

In the pile embedding method according to the embodiment, as shown in FIG. 2, the pile 20 is formed in the joint hole H <b> 1 that is preliminarily formed in the vicinity of the pile embedding site in order to facilitate the connection with the Yatco 10. It is inserted using a proper means, and only the pile head 21 is exposed to the ground surface.
On the other hand, the Yatco 10 is suspended above the pile 20 using a crane (not shown).
In this case, the phase in the circumferential direction of the notch 12 of the steel pipe 11 of the Yatco 10 is appropriately adjusted so as to match the phase in the circumferential direction of the protrusion 22 of the pile 20.

Next, as shown in FIG. 3, the yatco 10 lifted by a crane (not shown) is lowered and the steel pipe 11 is put on the pile head 21 of the pile 20, and at the same time, the pile is placed in the vertical groove 12 a of the notch 12 of the steel pipe 11. Twenty protrusions 22 are inserted.
The Yatco 10 is lowered until the protrusion 22 of the pile 20 is positioned in the vicinity of the upper end of the vertical groove 12a of the notch 12, and the descent is stopped in this state.

Further, as shown in FIG. 4, the suspended Yatco 10 is rotated in the circumferential direction of the steel pipe 11, and the protrusion 22 of the pile 20 is introduced into the lateral groove 12 b of the notch 12 of the steel pipe 11.
The Yatco 10 is further rotated until the protrusion 22 of the pile 20 is located in the vicinity of the right end of the lateral groove 12b of the notch 12, and stops rotating in this state. As shown in the figure, a play (gap) is formed between the protrusion 22 of the pile 20 and the notch 12 of the steel pipe 11.

Further, as shown in FIG. 5, the jack 13 built in the steel pipe 11 of the Yatco 10 is operated, the hydraulic cylinder 13 c is extended, and the movable portion 13 b is brought into contact with the upper surface of the pile head 21 of the pile 20.
When the hydraulic cylinder 13c is further extended from this state, the movable portion 13b receives a reaction from the pile head 21, whereby the fixed portion 13a of the jack 13 and the steel pipe 11 fixed to the fixed portion 13a are lifted by a minute amount.
Along with this, the notch 12 of the steel pipe 11 is also raised by a small amount, and the protrusion 22 on the outer periphery of the pile head 21 is pressed against the lower edge of the lateral groove 12b of the notch 12.
By such pressing operation using the jack 13, there is no play between the protrusion 22 of the pile 20 and the notch 12 of the steel pipe 11, and the pile 20 is firmly fixed so that it does not wobble or tilt with respect to the Yatco 10. Connected.
Thus, the connection work between the Yatco 10 and the pile 20 is completed.

Next, as shown in FIG. 6, the pile 20 to which the Yatco 10 is connected is lifted by a crane or the like, moved in advance to the embedding hole H <b> 2 previously created in the planned embedding site by a pile driving machine or the like, and then lowered. And insert it into the embedding hole H2.
At the time when the height stays high, the auger 30 is used to rotate the pile 20 together with the Yatco 10 in the circumferential direction and insert the pile 20 into the embedding hole H2 deeper until reaching the planned embedding depth.
In a state where the pile 20 is inserted at a planned embedding depth, the level of the pile 20 and the core of the pile 20 are confirmed using a transit level device, and if there is an abnormality, correction is appropriately performed. According to the method of the embodiment, since the pile 20 is firmly connected to the Yatco 10, there is no abnormality or very little, if any, and correction is usually unnecessary. If necessary, it can be easily corrected. The work using the transit level device is not indispensable for carrying out the present invention.
Thus, the burying work of the pile 20 is completed.

Further, as shown in FIG. 7, when the hydraulic cylinder 13 c of the jack 13 of the Yatco 10 is contracted, the movable portion 13 b is in contact with the upper surface of the pile head 21. Lowers a small amount so that it can be pulled to the side.
For this reason, since the fixing portion 13a of the jack 13 and the steel pipe 11 fixed to the fixing portion 13a are also lowered by a small amount, and the notch 12 is also lowered by a small amount, the pile pressed against the lower edge of the lateral groove 12b The 20 protrusions 22 are separated upward from the lower edge of the lateral groove 12b, and the pressing is released.

  Further, as shown in FIG. 8, the auger 30 is used to rotate the Yatco 10 in the circumferential direction, and the protrusion 22 of the pile 20 is moved from the right end of the lateral groove 12b of the notch 12 of the steel pipe 11 to the upper end of the vertical groove 12a. Lead to the department.

Further, as shown in FIG. 9, when the protrusion 22 of the pile 20 moves into the vertical groove 12a of the notch 12, the Yatco 10 is raised using a crane or the like, and the protrusion 22 is allowed to escape from the vertical groove 12a. Thereby, the connection between the Yatco 10 and the pile 20 is released.
By using the jack 13, the protrusion 22 of the pile 20 is forcibly separated from the groove edge of the lateral groove 12 b of the notch 12 of the steel pipe 11, so that the notch 12 and the protrusion 22 Separation is performed smoothly without being caught.
Further, from this state, the hydraulic cylinder 13c of the jack 13 is extended again as shown in the figure while pulling up the yoke 10.
In general, when the excavated soil enters the gap between the pile 20 and the yatco 10 and the pile 20 and the yatko 10 are in an abnormally close contact state, the piles rise together when the yatco 10 is pulled up, and a planned burial depth can be obtained. It will cause poor construction. However, since the pile 20 can be forcibly separated from the Yatco 10 by extending the jack 13 in this way, the pile 20 is prevented from rising. It should be noted that the extension operation of the hydraulic cylinder 13c is not indispensable for carrying out the present invention.
When the Yatco 10 is further raised and taken out from the embedding hole H2, all steps are completed.

  It should be considered that the embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications and variations within the scope and meaning equivalent to the terms of the claims.

10 Yatco 11 Steel pipe 12 Notch 12a Vertical groove 12b Horizontal groove 13 Jack 13a Fixed part 13b Movable part 13c Hydraulic cylinder 13d Hydraulic pipe 20 Pile 21 Pile head 22 Protrusion 30 Auger H1 Bonding hole H2 Buried hole

Claims (3)

Yatco, which consists of a steel pipe with a built-in jack, and has a notch made of a longitudinal groove extending in the axial direction from the lower edge of the steel pipe and a lateral groove extending in the circumferential direction of the steel pipe from the upper edge of the longitudinal groove on the lower outer periphery And a step of preparing a pile having a protrusion on the outer periphery of the pile head,
The Yatco is lowered from above the pile, the protrusion of the pile is inserted into the longitudinal groove of the notch, and then the steel pipe of the Yatco is rotated in the circumferential direction to introduce the protrusion of the pile into the lateral groove of the notch. Process,
The process of pushing up the steel pipe by the reaction from the pile head of the pile by extending the jack of the Yatco, and pressing the protrusion of the pile against the groove edge of the lateral groove of the notch,
A method of burying a pile, including a step of suspending a pile to which the Yatco is connected and inserting the pile into a burial hole provided in advance in a planned burial site up to a planned burial depth. further,
The step of pulling down the steel pipe by contracting the jack of the Yatco and separating the protrusion of the pile that was pressed against the groove edge of the lateral groove of the notch from the groove edge;
The pile embedding method according to claim 1, further comprising: rotating the steel pipe of the Yatco in a circumferential direction and then lifting the pipe to allow the protrusion of the pile to escape from the notch and separating the Yatco from the pile. further,
The pile embedding method according to claim 2, further comprising a step of lifting the yatco while extending the jack of the yatco separated from the pile to escape from the embedding hole.

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