JP3584356B2 - Tubular foundation - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a tubular foundation that supports columns for power transmission / distribution, communication, street lights, signal lights, and the like, and the base of a temporary building.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a tubular foundation having a plurality of excavating blades protruding at a tip thereof is laid on a predetermined ground, and a support (for example, a support for power transmission / distribution, communication, a street light, a signal light, etc.) is provided in the existing tubular foundation. Techniques for inserting and fixing, or fixing a pedestal on the upper part of a tubular foundation, and mounting and fixing a base such as a column for power transmission / distribution, communication, street lights, signal lights, temporary buildings, and the like are known. Have been.
The technique of laying the tubular foundation on the ground is as follows: after forming a hole in the predetermined ground with a depth corresponding to the laying length of the tubular foundation by preceding digging using an auger, screwing the tubular foundation into the hole. After that, insert the desired support and insert the solidifying agent such as mortar to join the tubular foundation and the support integrally, or insert the desired support or base etc. into the mortar or the like. It is to be mounted and fixed via a pedestal to a tubular foundation that is not to be made. When laying the tubular foundation, for example, in the case of laying the tubular foundation in the ground which is a preformed stratum, the laying area is sufficient only for the outer diameter of the tubular foundation, and a strong supporting force of the tubular foundation is obtained. Although it is possible to eliminate the damage to the ground and apply to narrow ground, it is difficult to screw the tubular foundation into the hard ground, and the hard foundation embraces the hard soil by screwing the tubular foundation. As a result, it becomes difficult to insert the mortar, so that a deeper excavation is required. In the tubular foundation laid without the mortar or the like, only a small sinking strength can be obtained.
[0003]
Further, as another conventional tubular foundation, each semicircle at the end of the steel pipe is deleted so as to diagonally intersect, and a fan-shaped plate having an outer diameter larger than the semicircle is fixed to the deleted portion to fix the tip of the steel pipe. A sealed pile is known (for example, see Japanese Patent Application Laid-Open No. 09-324419).
The technique of laying the steel pipe pile on the ground, the steel pipe pile is rotated by the auger, and the fan-shaped plate at the tip of the steel pipe pile is intruded into the ground while the fan-shaped plate at the tip of the steel pipe loosens the ground. Although the steel pipe piles can provide settlement strength with each fan-shaped plate, when laying the steel pipe piles, the area of the ground to be unraveled requires at least the area formed by a pair of fan-shaped plates, and the area of the ground to be laid Limits arise.
[0004]
[Problems to be solved by the invention]
The present invention has been made in view of the problems of these conventional tubular foundations, and has a structure capable of obtaining an easy screwing operation and obtaining a sinking strength after the laying, and has a structure of a pre-digging operation. It is an object of the present invention to provide a tubular foundation that can be reduced, applied to narrow ground, and the like.
[0005]
[Means for Solving the Problems]
The present invention achieves such an object,
According to a first aspect of the present invention, a part of each of the two semi-elliptical bottom plate pieces is fixed to the inner surface of the distal end portion of the tubular body, and the other part of each of the two semi-elliptical bottom plate pieces is fixed. Is separated from the tip of the tubular body, and the respective semi-elliptical bottom plate pieces are arranged in an intersecting form, and the ground is dug down to form soft earth and sand, and enters the tubular body. Is characterized in that it can be easily performed.
[0006]
According to a second aspect of the present invention, a pair of plate portions is provided at the tip of the tube according to the first aspect in parallel with the axis of the tube, and each of the pair of plate portions has two pieces. Is a tubular foundation connected to respective spaced portions of the semi-elliptical bottom plate pieces, and is characterized in that the supporting capacity and excavating ability of the semi-elliptical bottom plate pieces can be enhanced.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0008]
FIG. 1 is a side view of a tubular body 1 of a tubular foundation, and two plate pieces 3, 3 formed by cutting out a part of the tubular body 1 face each other at a distal end portion 11 thereof. For semi-elliptical shape to be described later (a shape corresponding to a half of an inclined surface obtained by projecting a circular cross section of the inner diameter of the tubular body 1). For solid support of a bottom plate piece and excavation of ground. Can be helpful.
[0009]
FIG. 2 is a perspective view of the bottom plate 2 of the tubular foundation. The bottom plate 2 is composed of two semi-elliptical bottom plate pieces 21 and 22, and each of the semi-elliptical bottom plate pieces 21 and 22 is flat. The side surfaces 21a and 22b cross each other and face each other.
[0010]
FIG. 3 is a side view of a tubular foundation formed by fixing the two semi-elliptical bottom plate pieces 21 and 22 shown in FIG. 2 to the distal end portion 11 of the tubular body 1 shown in FIG. The two semi-elliptical bottom plate pieces 21 and 22 are fixed to the inner surface of the distal end portion 11 of the tubular body 1 by welding, and the other half portions 21 d and 22 d Protrudes from the distal end 11a of the tubular body 1, is disposed in the same crossing form as shown in FIG. 2, and the crossing portion is welded. The other half portions 21d, 22d are connected to the lower ends of the two plate pieces 3, 3, respectively, by welding to form two triangular openings 4, 4, and two triangular through holes 5, 5. Have been.
[0011]
Here, the work of laying the tubular foundation having the structure shown in FIG. 3 will be described.
[0012]
First, a shallow hole is formed by applying an auger having a smaller diameter than the outer diameter of the tubular foundation to the place where the ground is laid, and the tubular foundation is inserted into the shallow hole and erected. Next, the tip of the auger is connected to the upper end of the tubular base, and when the auger is rotated while pressing, the tubular base is rotated while receiving the pressing. Both the pressing and rotating actions of the tubular foundation are performed by the two halves 21 d and 22 d of the two semi-elliptical bottom plate pieces 21 and 22 projecting from the tip 11 a of the tubular body 1, and cut the ground. The sediment passed through the two triangular through-holes 5, 5 is loosened. Then, the softened earth and sand which has been loosened advances through the two triangular openings 4, 4 formed in the inner surface of the tip end portion 11 of the tubular body 1, and is accumulated in the tubular body 1.
At the time of laying the tubular foundation, since the sediment accumulated in the tubular body 1 is loosened and softened, it is extremely easy to press and rotate the tubular foundation. It is possible to lay in a deep stratum, and since it is pushed in while being cut by the two plate pieces 3, 3, a hole having an inner diameter similar to the outer diameter of the tubular body 1 is excavated, and the laying of the tubular foundation without play is performed. Becomes possible.
[0013]
FIG. 4 is a side view according to another embodiment having a structure different from that of the tubular foundation shown in FIG. 3, and a tube 10 having a general structure having a flat distal end surface is used. Has been adopted.
In the two semi-elliptical bottom plate pieces indicated by reference numerals 21 and 22, these half portions 21c and 22c are fixed to the inner surface of the distal end portion 101 of the tubular body 10 by welding, and the other half portion 21d , 22d protrude from the distal end 101a of the tube body 10, and are arranged in a crossed form similar to that shown in FIG. Further, the other half portions 21d, 22d are connected by welding to two plate pieces 3, 3 projecting apart from the front end 101a by welding. The other half portions 21d and 22d are connected to the two plate pieces 3 and 3 by welding, respectively, and two triangular openings 4 and 4 and two triangular through holes 5 and 5 are formed. The tip portions 3a, 3a of the plate pieces 3, 3 project below the other half portions 21d, 22d.
[0014]
Therefore, the work of laying the tubular foundation having the structure shown in FIG. 4 will be described. In the same manner as the work of laying the tubular foundation shown in FIG. After a shallow hole is formed in the shallow hole, and the tubular foundation is inserted and erected in the shallow hole, the tubular foundation is rotated. Both the pressing and rotating actions of the tubular foundation are performed by laying the tubular foundation as required while forming a circular groove having the same diameter as the outer diameter of the tube body 10 through the tip portions 3a, 3a of the plate pieces 3, 3. Each of the two semi-elliptical bottom plate pieces 21, 22 projecting from the tip 101a cuts the ground, and the cut soil is separated into two triangular through holes 5 The earth and sand which has been loosened while passing through from 5, and which has been softened by being soaked advance into the pipe 10 through the two triangular openings 4 and 4 formed on the inner surface of the distal end portion 101 of the pipe 10, Stored.
At the time of laying the tubular foundation, since the sediment accumulated in the tubular body 10 is loosened and softened, it is extremely easy to press and rotate the tubular foundation. It can be laid in a deep stratum, and since it is pushed in while being cut by the two plate pieces 3, 3, an excavation of an inner diameter similar to the outer diameter of the pipe body 10 is made, and there is no play of the tubular foundation. Laying is possible.
[0015]
In addition, when the method of burying the lower end part of the support | pillar of transmission / distribution, communication, a street light, a signal light, etc. which is an object to be laid is employ | adopted, the tubular foundation shown to FIG. 3 and FIG. In each laying operation, it is necessary to discharge the earth and sand accumulated in the pipes 1 and 10 by using an auger or the like. Further, the plate piece of the tubular body shown in FIG. 3 may have a form in which the tip end protrudes from the lower end of the semi-elliptical bottom plate piece like the plate piece of the tubular body shown in FIG. Conversely, the plate piece of the tubular body shown in FIG. 4 is configured such that the tip end does not protrude from the lower end of the semi-elliptical bottom plate piece like the plate piece of the tubular body shown in FIG. Good.
[0016]
As described above, the embodiment according to the tubular foundation of the present invention has been described in detail. However, the present invention is not limited to the above-described embodiment, and can be designed without departing from the spirit of the present invention described in the claims. Can be variously changed.
In the embodiment of the present invention, for example, in order to lay the tubular foundation with high accuracy, the description has been made in which the two plate parts are protruded from the tubular foundation, but the two semi-elliptical bottom plate parts are durable. If it can be fixed firmly to the pipe body, it will be possible to efficiently remove the earth and sand, so the plate piece is not necessarily required, and the formation of the plate piece is a matter of design. Matters.
[0017]
【The invention's effect】
As can be understood from the above description, since the tubular foundation of the present invention can excavate in the entire cross-sectional area of the pipe, all the soil that enters the pipe becomes soft earth and sand that has been dug down, and enters the pipe. The sediment that has become difficult to adhere to the inside of the pipe. This means that the deep digging required to prevent the hard earth and sand that has entered the pipe from sticking into the pipe and alienating the excavation of the tubular foundation is reduced to a precedence with a shallow depth. It can be satisfied by digging, the amount of soil removal in the preceding digging work is reduced, and workability is improved. In addition, the laying work can be performed only by loosening the ground with the auger, without discharging the soil at the time of shallow advance digging by the auger. Then, the tubular foundation after the laying is provided with a strong supporting force against the sinking force of the tubular foundation by the bottom plate composed of the two semi-elliptical bottom plate pieces, and is laid firmly on a predetermined ground. .
[Brief description of the drawings]
FIG. 1 is a side view of a tubular body of a tubular foundation according to the present invention.
FIG. 2 is a perspective view of a bottom plate of the tubular foundation shown in FIG.
3 is a side view of a tubular foundation formed by fixing two semi-elliptical bottom plate pieces shown in FIG. 2 to the tubular body shown in FIG. 1;
FIG. 4 is a side view according to another embodiment different from the tubular foundation shown in FIG. 3;
[Explanation of symbols]
1, 10 pipe body 2 bottom plate 21, 22 semi-elliptical bottom plate piece 3 plate piece 4 triangular opening 5 triangular through hole

Claims (2)

A part of each of the two semi-elliptical bottom plate pieces is fixed to the inner surface of the distal end of the tubular body, and the other part of each of the two semi-elliptical bottom plate pieces is attached to the distal end of the tubular body. A tubular base, wherein each of the semi-elliptical bottom plate pieces is arranged in a crossed shape so as to be separated from the base plate. The distal end of the tubular body has a pair of plate pieces protruding in parallel with the axis of the tubular body, and each of the pair of plate pieces is separated from each other by two semi-elliptical bottom plate pieces. The tubular foundation according to claim 1, wherein the tubular foundation is connected to a tubular base.

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