JP2003147772A - Pile core setting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pile core setting tool capable of improving execution accuracy by easily controlling a pile core position and verticality of a steel pipe pile when burying the steel pipe pile in the ground by rotatably jacking the steel pipe pile. SOLUTION: This pile core setting tool is characterized by being constituted by arranging a circular arc-shaped member 7 having a circular arc-shaped surface 7a having a radius of curvature not less than a radius of curvature of the outer periphery of the steel pipe pile 1 in one end part, and arranging a distance discriminating means such as a nut 9 for discriminating a distance from the circular arc-shaped surface 7a in the radial direction of the steel pipe pile 1 in the other end part.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile core setting jig for setting a pile core position of a steel pipe pile, and in particular, a spiral blade is provided at the tip portion. The present invention relates to a pile core setting jig suitable for setting a pile core position of a steel pipe pile when the steel pipe pile is rotationally propelled and embedded in the ground. 2. Description of the Related Art Conventionally, as shown in FIG. 3, a steel pipe pile 1 having a cutting blade, excavation claw, and a spiral blade 1c attached to its tip is rotated and propelled by a rotary driving device 3 to thereby rotate the steel pipe. The pile 1 is twisted into the ground 2 and propelled to automatically press the volume of the steel pipe pile 1 body in the lateral direction of the pile.
There is known a construction method in which foundation piles are installed on a predetermined ground 2 without soil removal. When the steel pipe pile 1 is rotationally embedded, it is necessary to manage the pile core position and the verticality of the steel pipe pile 1, but even if the pile core position 4 is set on the ground 2, the steel pipe pile 1 is installed. Since the pile core position 4 becomes invisible at that time, conventionally, as shown in FIG. 4, relief core positions 5 a and 5 b that are separated from the pile core position 4 by a predetermined distance (for example, 1 m) in two perpendicular directions are set. When the burial of the steel pipe pile 1 is started by preparing a measuring rod 6 having a length obtained by subtracting the radius of the steel pipe pile 1 from the distance between the clearance core positions 5a, 5b and the pile core position 4, Position 5a,
The pile core position 4 was confirmed by applying the measuring rod 6 to the outer peripheral surface of the steel pipe pile 1 from the two directions 5b. However, in the above-described conventional example, there is a problem that the error is increased and the accuracy is poor because the measuring rod 6 is only applied to one point on the outer peripheral surface of the steel pipe pile 1. . Moreover, since the operator grips the measuring rod 6 and hits the outer peripheral surface of the steel pipe pile 1 with a point, there is a problem that the measuring operation is difficult and workability is poor. Further, even if it can be confirmed that the measuring bar 6 is in contact with the outer peripheral surface of the steel pipe pile 1, there is a problem that it cannot be easily confirmed whether or not the steel pipe pile 1 being rotated is vertical. there were. The present invention solves the above problems,
The purpose is to provide a pile core setting jig that can facilitate the management of the pile core position and verticality of the steel pipe pile and improve the construction accuracy when the steel pipe pile is rotationally propelled and embedded in the ground. It is to be provided. To achieve the above object, a pile core setting jig according to the present invention is a pile core setting jig for setting a pile core position of a steel pipe pile, and is embedded in the pile core setting jig. The steel pipe pile has a radius of curvature equal to or greater than the outer circumference curvature radius, and an arcuate surface that is in contact with and slides on the outer circumference surface of the steel pipe pile is formed at one end, and the circle in the radial direction of the buried steel pipe pile A distance determining means for determining a distance from the arcuate surface is provided at the other end. Since the present invention is constructed as described above, the arcuate surface provided at one end of the pile core setting jig is provided at the other end while sliding against the outer peripheral surface of the steel pipe pile. When the steel pipe pile is rotated and propelled by embedding it in the ground by determining the distance from the escape center position that is a predetermined distance away from the pile core position in advance by the distance determination means for determining the distance from the arcuate surface It is possible to easily manage the pile core position of the steel pipe pile and improve the construction accuracy. [0009] Since the arc-shaped surface and the outer peripheral surface of the steel pipe pile can be applied with a line or a surface, the operator can easily apply it to the outer peripheral surface of the rotating steel pipe pile holding the pile core setting jig.
Measuring accuracy is also improved. Further, the arcuate surface provided at one end of the pile core setting jig has a predetermined width in the vertical direction, so that the steel pipe pile can be rotated and propelled when buried in the ground. It is also possible to manage the verticality of steel pipe piles. [0011] The distance discriminating means is configured to provide a relief core position set at a predetermined distance from a preset pile core position, and an outside of the steel pipe pile to be embedded from the distance between the pile core positions. Various means can be applied in which the distance obtained by subtracting the radial radius can be determined in the radial direction of the steel pipe pile embedded from the arcuate surface. For example, an index such as a nut or marking is provided at a position corresponding to the clearance core position. Alternatively, the end of the pile core setting jig may be configured to be extensible and the length of the end of the pile core setting jig may be adjusted to a position corresponding to the escape core position. The arcuate surface may have a radius of curvature corresponding to the radius of curvature of the steel pipe pile to be buried, or it may be set to the radius of curvature of the steel pipe pile of the maximum diameter assumed. The steel pipe pile having a smaller radius of curvature may be used in common. Further, for the purpose of reducing the frictional resistance when the steel pipe pile is in contact with and sliding on the outer peripheral surface of the steel pipe pile when it is embedded, a lubricating member such as a synthetic resin having a small surface friction coefficient is provided on the arcuate surface. Friction reducing means may be applied. DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a pile core setting jig according to the present invention will be specifically described with reference to the drawings. FIG. 1 is a plan view and a front view showing the configuration of a pile core setting jig according to the present invention, and FIG. 2 manages the pile core position and verticality of a steel pipe pile using the pile core setting jig according to the present invention. It is a figure which shows a mode. still,
The numerical values, materials, shapes, and arrangement relationships shown below are merely examples when the present invention is applied, and are not limited to these. In FIG. 1, A is the pile core position 4 of the steel pipe pile 1.
Is a pile core setting jig that has a predetermined length and a radius of curvature equal to or greater than the outer radius of curvature of the steel pipe pile 1 to be buried. The arcuate member 7 formed with the arcuate surface 7a to be slid in contact is joined. The measuring rod 6 is composed of, for example, a PC (precast) steel rod or a reinforcing bar having an outer diameter of 15 mm and a length of 1 m, and is joined to the arcuate member 7 by welding 8 or the like. A screw portion 6a is formed to a predetermined length at the end of the measuring rod 6 opposite to the side to which the arcuate member 7 is attached, and a nut 9 serving as a distance determining means is formed on the screw portion 6a.
a and 9b are screwed together. The arcuate member 7 has, for example, an outer diameter of 26
It has an inner circumference radius of curvature (133.7 mm) corresponding to the outer circumference radius of curvature (133.7 mm) of the steel pipe pile 1 of 7.4 mm, and has a thickness t
Is about 2 mm to 3 mm, the width W is 34 mm, and the total length L of the arc is about 1/4 (about 210 mm) of the total circumferential length. The arc-shaped member 7 cuts the steel pipe into a ring shape,
Furthermore, what was cut | disconnected to 1/4 of the whole circumference is employable. Although not shown, the arc-shaped surface 7a has a small surface friction coefficient for the purpose of reducing the frictional resistance when the steel pipe pile 1 is slid and buried in contact with the outer peripheral surface of the steel pipe pile 1. Friction reducing means such as a lubricating member such as resin may be provided. The nuts 9a and 9b serving as distance discrimination means are
From the clearance distance between the escape core positions 5a and 5b set at a predetermined distance from the preset pile core positions 4a and 4b in which the steel pipe piles 1a and 1b are embedded and the pile core positions 4a and 4b The threaded portion 6a of the measuring rod 6 so that the distance obtained by subtracting the outer diameter radius of each steel pipe pile 1a, 1b can be discriminated from the arcuate surface 7a of the arcuate member 7 in the radial direction of the steel pipe piles 1a, 1b. And are fixed to the predetermined position. In this embodiment, as shown in FIG. 1, in the case of a steel pipe pile 1a having an outer diameter of 267.4 mm (radius 133.7 mm), the distance from the arcuate surface 7a to the nut 9a is 866.mm.
It is set to 3 mm and the outer diameter is 165.2 mm (radius 8
In the case of the 2.6 mm) steel pipe pile 1b, the distance from the arcuate surface 7a to the nut 9b is set to 917.4 mm. The radius of curvature of the arcuate surface 7a of the arcuate member 7 may be set to the outer radius of curvature of the steel pipe pile 1 having the maximum diameter to be used, and the pile core position 4 and the clearance core positions 5a and 5b are separated from each other. What is necessary is just to set the fixing position of the nut 9 from the circular-arc-shaped surface 7a by the dimension which deducted the outer periphery radius of each steel pipe pile 1 from the space | interval. An index such as marking may be provided in place of the nut 9 at a position corresponding to the clearance core positions 5a and 5b, and the measuring rod 6 of the pile core setting jig A is configured to be extendable and retractable. You may adjust the length of the edge part of the measuring rod 6 of the pile core setting jig | tool A to the position corresponding to the relief core positions 5a and 5b. Next, the manner in which the pile core position 4 and the verticality of the steel pipe pile 1 are managed by the above pile core setting jig A will be described with reference to FIG. First, as shown in FIG. 2, a pile core position 4 for embedding the steel pipe pile 1 is set, and a clearance core position 5a is set in advance by taking a distance of 1 m from the pile core position 4 in two directions at right angles from the pile core position 4 in advance. , 5b, and poles, reinforcing bars and the like serving as indexes are driven into the escape core positions 5a, 5b. Then, as shown in FIG. 3, when the steel pipe pile 1 provided with a spiral blade 1c at its tip is rotated and propelled by the rotary drive device 3 and embedded in the ground 2, a pile core position 4 and
Two sets of pile core setting jigs A in which the distance from the arcuate surface 7a to the nut 9 is set by subtracting the outer peripheral radius of the steel pipe pile 1 to be embedded from the distance from the escape core positions 5a and 5b,
The arcuate surface 7a of the arcuate member 7 is abutted and slid on the outer peripheral surface of the steel pipe pile 1 from the respective escape core positions 5a and 5b so that the index of the escape core positions 5a and 5b and the position of the nut 9 coincide. To manage. According to the above construction, the arcuate surface 7a of the arcuate member 7 provided at one end of the pile core setting jig A is brought into contact with and slides on the outer peripheral surface of the steel pipe pile 1, and the other end is provided. By determining the distance from the escape core positions 5a and 5b previously separated from the pile core position 4 by a nut 9 serving as a distance determination means for determining the distance from the provided arcuate surface 7a, It is possible to easily manage the pile core position 4 of the steel pipe pile 1 when the steel pipe pile 1 is rotationally propelled and embedded in the ground 2, and the construction accuracy can be improved. In particular, since the arcuate surface 7a and the outer peripheral surface of the steel pipe pile 1 can be brought into contact with each other by a line or a surface, the outer peripheral surface of the steel pipe pile 1 rotated by the operator holding the pile core setting jig A. It is easy to touch and the measuring accuracy is improved. Since the arcuate surface 7a provided at one end of the pile core setting jig A has a predetermined width W in the vertical direction, the steel pipe pile 1 is rotated and propelled when buried in the ground 2. It is also possible to manage the verticality of the steel pipe pile 1 together. The arcuate surface 7a is a steel pipe pile 1 to be buried.
The radius of curvature corresponding to the outer radius of curvature of the steel pipe pile 1 may be adopted, or it is set to the outer radius of curvature of the steel pipe pile 1 of the largest diameter assumed and common to the steel pipe pile 1 having a smaller outer radius of curvature than that. It may be configured so that it can be used. Since the present invention has the above-described configuration and operation, the arcuate surface provided at one end of the pile core setting jig is brought into contact with and slides on the outer peripheral surface of the steel pipe pile. While the distance discriminating means for discriminating the distance from the arcuate surface provided at the other end portion, the distance from the escape core position that is a predetermined distance away from the pile core position is discriminated in advance. It is possible to easily manage the pile core position of the steel pipe pile when it is rotated and propelled and buried in the ground, and the construction accuracy can be improved. In particular, the arcuate surface and the outer peripheral surface of the steel pipe pile are lines,
Alternatively, since it can be applied on the surface, the operator can easily apply it to the outer peripheral surface of the steel pipe pile that grips and rotates the pile core setting jig, and the measuring accuracy is improved. Further, when the arcuate surface provided at one end of the pile core setting jig has a predetermined width in the vertical direction, the steel pipe pile is rotated and propelled when embedded in the ground. The management of the verticality of the steel pipe pile can be performed together. The arcuate surface may have a radius of curvature corresponding to the radius of curvature of the steel pipe pile to be buried, or may be set to the radius of curvature of the steel pipe pile of the maximum diameter assumed. The steel pipe pile having a smaller radius of curvature may be used in common.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view and a front view showing a configuration of a pile core setting jig according to the present invention. FIG. 2 is a diagram showing a state in which the pile core position and verticality of a steel pipe pile are managed using the pile core setting jig according to the present invention. FIG. 3 is a diagram showing a state where a steel pipe pile is buried. FIG. 4 is a diagram illustrating a conventional example. [Explanation of Symbols] A ... Pile core setting jig 1, 1a, 1b ... Steel pipe pile 1c ... Spiral blade 2 ... Ground 3 ... Rotation drive device 4a, 4b ... Pile core position 5a, 5b ... Escape core position 6 ... Measuring rod 6a ... Screw portion 7 ... Arc-shaped member 7a ... Arc-shaped surface 8 ... Welding 9, 9a, 9b ... Nut

Claims (1)

[Claims] [Claim 1] A pile core setting jig for setting a pile core position of a steel pipe pile, having a curvature radius equal to or greater than an outer peripheral curvature radius of an embedded steel pipe pile, An arcuate surface that contacts and slides on the outer peripheral surface is formed at one end, and a distance discriminating unit that discriminates a distance from the arcuate surface in the radial direction of the embedded steel pipe pile is provided at the other end. A pile core setting jig characterized by that.