JP2011236578A - Subsidence prevention pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a subsidence prevention pile which is capable of preventing subsidence without increasing the number of components and in which subsidence prevention is not impeded even if an obstacle such as hard rock is present.SOLUTION: A subsidence prevention pile comprises: a pipe-shaped pile body 110, with a plurality of slits 111 formed from one end side of the pile body 110 toward the other end side and tongue piece parts 112 formed between the neighboring slits 111; and a sharp part 120 detachably attached to the one end of the pile body 110. The sharp part 120 is formed integrally with a body part 121 with a sharp point and a fitting part 122, which is located in a rear end side of the body part 121 and onto which the one end of the pile body 110 fits. When the sharp part 120 is separated from the one end of the pile body 110, the tongue piece part 112 formed at the one end of the pile body 110 expands the diameter outwardly.

Description

  The present invention relates to a settlement prevention pile used for a construction scaffold or the like.

A scaffold used at a construction site is constructed by combining steel pipes generally called single pipes with joints or the like.
The foundation of this scaffold may be configured by driving a single tube with a conical pointed end attached to the tip into the ground (see Patent Document 1).

However, if the single tube is simply driven into the ground, the single tube will further sink to the ground due to a load during use, and the entire scaffold may be distorted.
In order to prevent such a risk, a pile has been devised in which a projecting member is projected from the side of the distal end side of the single pipe driven into the ground in order to prevent the single pipe from sinking (see Patent Document 2). .

Japanese Patent Application Laid-Open No. 07-300854 JP 2005-009295 A

However, the pile described in Patent Document 2 is a press in which an overhang member separate from the pile body driven into the ground is inserted in advance inside the tip of the pile body, and the pile body is driven into the ground after being driven into the ground. The projecting member is protruded outward from the pile body by a bar.
That is, the pile main body and the projecting member are separate bodies, and there is a problem that the number of parts increases.
In addition, when there is an obstacle such as a hard rock in the portion where the projecting member projects, the projecting member may be prevented from projecting by being obstructed by the obstacle, and the purpose of preventing settlement may not be achieved.

  The present invention was devised in view of the above circumstances, and provides a settlement prevention pile that can prevent settlement without causing an increase in the number of parts, and also prevents settlement even when there are obstacles such as hard rocks. The purpose is to provide a settlement-preventing pile that will not be hindered.

  The subsidence prevention pile according to the present invention has a plurality of slits formed from one end side to the other end side, and a pipe-like pile body having a tongue piece between the slits, and can be detached from one end side of the pile body A sharpened portion attached to the body, and the sharpened portion is a body portion having a sharp tip and a rear end side of the body portion, and a fitting portion into which one end side of the pile body is fitted is integrated. When the sharpened part is separated from the one end side of the pile main body, the tongue piece formed on the one end side of the pile main body expands toward the outside.

  The tongue piece is formed with a weakened portion, for example, a hole, which is weaker than other portions.

  The main body portion of the sharpened portion has a conical shape.

  The tip of the tongue piece is pointed.

  The length of the slit is set shorter than the dimension in which the pile body is driven into the ground.

  The subsidence prevention pile according to the present invention has a plurality of slits formed from one end side to the other end side, and a pipe-like pile body having a tongue piece between the slits, and can be detached from one end side of the pile body A sharpened portion attached to the body, and the sharpened portion is a body portion having a sharp tip and a rear end side of the body portion, and a fitting portion into which one end side of the pile body is fitted is integrated. It is formed, and when the sharpened part is detached from one end side of the pile body, the tongue piece part formed on one end side of the pile body is designed to expand toward the outside, so after driving into the ground, When the sharp part at the tip is removed and the main body part is driven into the ground, the tongue piece part naturally expands in diameter. For this reason, it is possible to prevent subsidence without using a separate part as in this type of subsidence prevention pile.

  Even if there are obstacles such as hard rocks before the pile body is driven, the tongue piece is formed with a weaker part, for example, a hole, than the other part. One part naturally deforms. For this reason, the pile main body is not blocked by an obstacle such as a hard rock.

It is a schematic perspective view of the settlement prevention pile concerning an embodiment of the invention. It is a schematic perspective view of the pile main body which comprises the settlement prevention pile which concerns on embodiment of this invention. It is a schematic explanatory drawing explaining the usage method of the settlement prevention pile which concerns on embodiment of this invention. It is a schematic perspective view of the pile main body which comprises the settlement prevention pile which concerns on other embodiment of this invention. It is a schematic explanatory drawing which shows the deformation | transformation of the tongue piece part of the pile main body in the settlement prevention pile which concerns on other embodiment of this invention. It is a schematic perspective view of the pile main body which comprises the settlement prevention pile which concerns on other embodiment of this invention. It is a schematic perspective view of the pile main body which comprises the settlement prevention pile which concerns on other embodiment of this invention.

  The settlement prevention pile 100 according to the embodiment of the present invention includes a pipe-shaped pile body 110 in which a plurality of slits 111 are formed from one end side toward the other end side, and the gap between the slits 111 becomes a tongue piece portion 112; The pile main body 110 is provided with a sharpened portion 120 detachably attached to one end side of the pile main body 110, the sharpened portion 120 being a main body portion 121 having a sharp tip and a rear end side of the main body portion 121, and the pile. The fitting portion 122 into which one end side of the main body 110 is fitted is integrally formed, and when the sharpened portion 120 is detached from one end side of the pile main body 110, a tongue piece portion 112 formed on one end side of the pile main body 110 is formed. The diameter is increased toward the outside.

First, the pile body 110 has a round pipe shape, and six slits 111 directed to the other end are formed on one end thereof. The slit 111 is set to be shorter than the dimension in which the pile body 110 is driven into the ground. That is, when the pile main body 110 is driven into the ground, the slit 111 completely enters the ground.
The slits 111 are formed at intervals of 60 degrees.

  The pile body 110 is made of steel, and by forming the slit 111, the tongue piece portion 112 between the slit 111 and the slit 111 naturally expands toward the outside due to stress ( (See FIG. 2).

  On the other hand, the sharpened portion 120 is made of steel in the same manner as the pile main body 110, and has a substantially conical main body 121 whose bottom surface diameter is substantially equal to the diameter of the pile main body 110, and the rear end side of the main body portion 121. The cylindrical fitting part 122 which protrudes from is integrally formed. The main body 121 is a portion that becomes a tip when the settlement prevention pile 100 is driven into the ground.

In the fitting portion 122, the six tongue pieces 112 of the pile body 110 squeezed inward are fitted. That is, the sharpened portion 120 is attached to the pile body 110 by fitting the six tongue pieces 112 into the fitting portion 122.
In addition, the tongue piece part 112 which is the one end side of the pile main body 100 is only fitted by the fitting part 122, and is not necessarily integrated by welding or other integration means. That is, the sharpened portion 120 is detachably attached to the pile main body 110.

  The tip of the tongue piece 112 is pointed as shown in FIG. For this reason, after the sharpened portion 120 is detached from the pile main body 110, the further driving of the pile main body 110 is smoothly performed.

Next, the use procedure of the settlement prevention pile 100 having the above-described configuration will be described with reference to FIG.
In a state where the sharpened portion 120 is attached to one end side of the pile main body 110, the pile main body 110 is driven into the ground G from the sharpened portion 120 (see FIG. 3A).
When the pile main body 110 is driven to the front of the target depth, for example, about 50 cm, the driving is temporarily stopped (see FIG. 3B).
At this time, it is desirable that all the tongue pieces 112 are located below the ground G. That is, when even a part of the tongue piece 112 is positioned on the ground G, the surface of the surface of the ground G may be dug up by the tongue piece 112 due to the driving of the pile body 110 after the sharpened portion 200 described later is removed. Because.
Since the length of the slit 111 is set to be shorter than the dimension in which the pile main body 110 is driven into the ground G, all the tongue pieces 112 can be positioned below the ground G.

As shown in FIG. 3 (C), the release rod 200 is inserted from the other end side of the pile body 110 in this state. The detachment bar 200 is a steel bar set longer than the pile body 110.
With the tip of the release rod 200 inserted into the main body 121 of the sharpened portion 120, the rear end of the release rod 200 protruding from the other end side of the shoe main body 110 is driven with a hammer or the like.
The sharpened portion 120 is detached from one end side of the pile main body 110 by driving the separation rod 200. Further, the removal rod 200 is driven to move the sharpened portion 120 away from one end side of the pile body 110.
Since the sharpened portion 120 is detached from the one end side of the pile main body 110, the tongue piece portion 112 on the one end side of the pile main body 110 in the ground G is enlarged in diameter toward the outside.
In the state of FIG. 3C, since the tongue piece 112 is in the ground G, the diameter of the tongue piece 112 is not enlarged as shown in FIG. It is depicted with a larger diameter.

With the sharpened portion 120 detached from the pile body 110, the removal rod 200 is extracted from the pile body 110, and the pile body 110 is driven into the ground G to a desired depth.
By driving the pile body 110 further, the pile body 110 is driven into the ground G while expanding the tongue piece portion 112 further outward (see FIG. 3D).

  When a scaffold is built on the basis of such a pile main body 110, the pile main body 110 is driven into the ground G with the tongue piece portion 112 radially expanded when viewed from the ground surface side. Even if a load is applied to 110, the pile main body 110 does not further sink.

Next, 110 A of main-body parts which comprise the subsidence prevention pile which concerns on other embodiment of this invention are demonstrated, referring FIG.
The main body part 110A is different from the main body part 110 of the settlement settlement pile 100 described above in that a weak part is provided in the tongue piece part 112A.
This weak part is a part formed weaker than the other part of the tongue piece part 112A. For example, as shown in FIG. 4, it can be set as a weak part by opening hole 113A in a part of tongue piece part 112A.

Such a weak part exhibits its effect in the following cases.
That is, as shown in FIG. 5 (A), the tip 120A of the settlement prevention pile 100 driven into the ground has come into contact with an obstacle R such as a hard rock, making further driving difficult. Even in this case, the tongue portion 112A is deformed outward from the portion where the hole 113A, which is a fragile portion, is opened, and the tip side of the pile body 110A is deformed as if it is a lantern, so that settlement can be prevented. is there.

Further, as shown in FIG. 5B, when the pile main body 110A is further driven into the ground after the sharpened portion 120A is detached from the pile main body 110A, a strong obstacle such as a hard rock on the front end side of the tongue piece 112A. If there is an object R, the pile main body 110A cannot be driven at that time.
However, if the tongue piece portion 112A has a hole 113A as a fragile portion, the tongue piece portion 112A is deformed from the portion of the hole 113A that is the fragile portion, as shown in FIG. Since the obstacle R is avoided, the pile body 110A can be driven further.

In addition to the type in which the hole 113A is formed in the tongue piece 112A as shown in FIG. 4, as the fragile portion, a concave groove 114A along the width direction is formed in the tongue piece 112A as shown in FIG. There are types. The concave groove 114A can be formed not only on the front side of the tongue piece 112A, but also on the back side, or on both the front and back sides.
Needless to say, the hole 113A opened as the fragile portion may be not only a round hole but also any hole, and two or more holes may be opened in one tongue piece portion 112A.
Of course, two or more fragile portions made of grooves such as the concave groove 114A may be formed.

  Furthermore, although the tip of the tongue piece 112 (112A) is pointed in the above-described embodiment, it is needless to say that the tongue piece 112B may be not sharp as shown in FIG.

  In the above-described embodiment, the sharpened portion 120 has the conical main body 121. However, the main body 121 may be a pyramid shape or a shape obtained by obliquely cutting a cylinder. In other words, it is important that it is formed so as to be easy to be driven into the ground.

DESCRIPTION OF SYMBOLS 100 Settlement prevention pile 110 Main body part 111 Slit 112 Tongue piece part 120 Sharp part 121 Main body part 122 Fitting part

Claims (6)

  A pipe-shaped pile body having a plurality of slits formed from one end side toward the other end side and a tongue piece between the slits, and a sharpened portion removably attached to one end side of the pile body The sharpened portion is formed integrally with a main body portion having a sharp tip and a rear end side of the main body portion, and a fitting portion into which one end side of the pile main body is fitted, and the sharpened portion is A settlement-preventing pile in which a tongue piece formed on one end side of the pile body expands toward the outside when detached from one end side of the pile body.   The sag prevention pile according to claim 1, wherein the tongue piece is formed with a fragile portion weaker than other portions.   3. The settlement prevention pile according to claim 2, wherein the fragile portion is a hole.   The settlement-preventing pile according to claim 1, 2 or 3, wherein the main body portion of the sharpened portion has a conical shape.   5. The settlement prevention pile according to claim 1, wherein a tip of the tongue piece is pointed.   6. The settlement prevention pile according to claim 1, wherein a length of the slit is set to be shorter than a dimension in which the pile main body is driven into the ground.

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