JPH086544B2 - Construction method of self-supporting power pole and its basic structure - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method of burying a utility pole foundation pipe across a groundwater vein and its foundation structure.

[Prior Art] When burying a base pipe for a normal utility pole, a preceding hole 3 corresponding to the length of the base pipe 2 is pierced by a screw auger 1 of a digging column truck (not shown). . (Fig. 9) Next, when the tip harpoon 4 of the screw auger 1 is connected to the pedestal 5 for the utility pole that is set in advance in the foundation pipe 2, and the screw auger 1 is rotated while applying the own weight of the digging construction pole car. , The foundation pipe 2 is also driven and rotated at the same time, and the cutting blades 6, 6 ... Fixed to the leading edge of the foundation pipe 2 are screwed in while breaking down the peripheral wall of the previously drilled preceding hole 3, and as shown in FIG. The outer peripheral wall of is screwed in close to the soil.

At this time, the soil 7 scraped off by the cutting blades 6, 6 ... Deposits below the pedestal 5 at the bottom of the foundation pipe 1 that has been dug as shown in FIG. If it occurs, completely bury it in earth and sand and then
Place it on the pedestal 5.

At this time, the gap d between the foundation pipe 2 and the electric pole 9 is completely packed with sand and solidified, and the ground portion 10 is solidified with quick-drying mortar 10 'so that the packed sand does not flow out. (Fig. 13)

[Problems to be Solved by the Invention] As described in the prior art, the construction of the self-supporting utility pole in the normal land without a groundwater vein is as described above, but when digging the screw auger, FIG. When the water vein 11 existing in the ground is unfortunately crossed, the inner wall of the preceding hole 3 collapses along with the outflowing water, and when pump drainage is troublesome or the water amount is abundant, The flooded part 12 in the preceding hole 3 is largely scooped out (Fig. 15) and the adhesion between the foundation pipe 2 and the soil, which will be constructed later, is hindered, and the fixing of the foundation pipe 2 becomes so unstable that the foundation The bearing capacity of the pipe 2 is unavoidable. (Fig. 16) This means that the landslides will gradually increase with the passage of time, and the instability will increase.

The present invention has been made in view of the above problems of the conventional technique, and its object is to provide a water vein as described above even in a state where the water vein crosses a portion where the foundation pipe is buried in the soil. The present invention proposes a method and a basic structure that can sufficiently fix the foundation pipe 2 and build an electric pole that can endure long-term use.

[Means for Solving the Problems] In order to achieve the above object, the method for constructing a self-supporting utility pole of the present invention is such that when there is a water vein crossing a foundation pipe that holds the power pole, the water vein is formed by drilling with a screw auger. It stays in the upper part that does not reach, and fits the convex part of the rotation connecting tool to the pair of locking parts provided in the upper end opening of the complete hollow base pipe equipped with a plurality of cutting blades at the tip, and After screwing the foundation pipe to the required depth across the water vein by rotating the screw auger with the harpoon part of the screw auger locked to the bolt nut fixed through the rotation connecting tool, Remove the rotation connecting tool, excavate and remove the earth and sand in the foundation pipe with only the screw auger to remove the screw auger at a desired depth, and remove the pair of bands of the suspension cradle. By suspending the pedestal portion fixed between the lower ends of the bands in the basic pipe by suspending with screws with each locking portion of the basic pipe, the lower portion of the pedestal portion is It is filled with earth and sand, the electric pole is placed on the pedestal portion of the suspension cradle, the space between the foundation pipe and the electric pole is filled with earth and sand, and the ground line portion is filled with quick-drying mortar. I am trying.

Further, the built-in foundation structure of the self-supporting utility pole of the present invention has a required length that traverses a groundwater vein, and a completely hollow foundation pipe having a pair of locking portions formed in an upper end opening thereof, and the above-mentioned member of the foundation pipe. A pedestal portion is fixedly provided between the lower ends of a pair of bands that are fastened by screws to the stop portion, and a regulation rod that defines the center point of the base pipe is stretched in a cross shape on the pedestal portion. Each of the base pipes is provided with each of the protrusions of a rotary connection tool that is provided with a pair of protrusions fixedly provided at both ends and a bolt and nut is inserted and fixed on one side. It is characterized in that the foundation pipe can be screwed into the ground by connecting and rotating the harpoon portion of the screw auger with the bolt nut in a state of being fitted to the locking portion.

[Operation] The surrounding wall of the preceding hole is prevented from collapsing by the digging method that cuts water directly into the underground pipe by the cutting edge of the foundation pipe and at the same time prevents the inflow of water and the landslide on the side wall of the foundation pipe. Since the foundation pipe is first screwed in and then the earth and sand in the pipe is excavated by a screw auger, the groundwater vein can be crossed very smoothly.

[Examples] Examples will be described with reference to the drawings.

It should be noted that, in FIGS. 1 to 8 according to the present invention, the same parts as those of the conventional product are designated by the same reference numerals.

First, as shown in the first illustration, the screw auger 1 is fastened to the upper part that does not reach the groundwater vein 11 to dig a preceding hole, and then the screw auger 11 is pulled out to leave the foundation pipe 2 completely hollow, and the second As shown in the figure, the foundation pipe 2 is connected to the tip harpoon 4 via a rotary connection tool 13 (shown in FIG. 8).

The rotary connecting tool 13 is fitted inside the foundation pipe 2, and the lower end projections 14, 14 are provided with notches 15 in the foundation pipe 2.
The pipes 16 and 16 are fixedly mounted on one side of the rotary connection tool 13 with both ends projecting, and bolts 17 are inserted and fixed to these pipes 16 and 16. As shown in the second drawing, a part of the tip harpoon 4 of the screw auger 1 is brought into contact with the bolt 17 penetrating the rotation connecting tool 13 so that they are connected to each other. In this way, the foundation pipe 2 having a completely hollow center is connected to the screw auger and pushed into the preceding hole 3 and screwed in. The cutting blades 6, 6 ... If you cut this along and enter, and reach the bottom 3a of the hole,
Only the pipe 2 is forcibly screwed in as it is. At this time, the foundation pipe 2 is immediately contacted with 6, 6 ...
The peripheral wall of the device does not almost block the water vein 11 to reliably prevent the inflow of water to enter the inside of the pipe, and it is possible to prevent the sediment from collapsing as shown in FIG.

Thus, the rotary connecting tool 13 is removed from the foundation pipe 2 which has reached a certain depth across the water vein 11 as shown in FIG. 4, and the earth and sand in the foundation pipe 2 are removed only by the screw auger 1 to obtain the required depth. Stop at the screw auger 1
And the tip hooks 20 and 20 of the band 19 provided at both ends of the suspension cradle 18 shown in FIG.
It is hung on 5,15 and fixed to the locking holes 22,22 of the base pipe 2 with screws 21,21 respectively, and the lower part of the pedestal part 5 is sufficiently filled with earth and sand, and then the utility pole 9 is placed on it. The pedestal portion 5 is to be placed and is provided with a cross-shaped regulating rod 23 so that the center point is provided.

Thus, the gap d between the utility pole 9 placed on the cradle part 5 and the pipe peripheral wall is sufficiently filled with earth and sand, and the ground wrinkle part 10 near the ground surface is filled with quick-drying mortar to complete the construction. To do. (FIG. 5) [Effect of the invention] Since the foundation pipe thus buried crosses the water vein directly by the pipe, it is possible to prevent landslide as much as possible as shown in FIGS. 3 to 5. The durability after burying the foundation pipe was also extremely good, and it was possible to bring about an extremely excellent effect in the burying work and structure as well as simplifying the work.

[Brief description of drawings]

1 to 5 are partially cutaway side views showing a specific example of the order of burying electric poles according to the present invention, FIG. 6 is a perspective view of a foundation pipe, and FIG. 7 is a perspective view of a suspension cradle. FIG. 8 is a perspective view of the rotary connection tool, FIGS. 9 to 13 are partially cutaway side views sequentially showing the conventional embedding in a normal case, and FIGS. 14 to 16.
The figure is a partially cutaway side view showing an excavated state when a water vein exists underground. DESCRIPTION OF SYMBOLS 1-Screw auger, 2-Foundation pipe 3-Preceding hole, 4-Tip harpoon 5-Receptor part, 6-Cutting blade 9-Power pole, 11-Water vein 13-Rotating connection tool, 18-Suspended cradle

Claims (2)

[Claims] 1. When there is a water vein crossing a foundation pipe (2) holding a utility pole, the drilling by a screw auger (1) is retained at an upper portion which does not reach the water vein, and a plurality of cutting blades (6, (6 ...) equipped with a pair of locking parts (15, 15) provided on the upper end opening of a completely hollow base pipe (2), the convex parts (14, 14) of the rotary connection tool (13) are fitted. Bolt nut (17) which is inserted and fixed in the rotation connecting tool (13).
After screwing the foundation pipe (2) to the required depth across the water vein by rotating the screw auger (1) with the harpoon part of the screw auger (1) locked to the Remove the motion connecting tool (13), excavate and remove the earth and sand in the foundation pipe (2) with only the screw auger (1), and remove the screw auger (1) at a desired depth, and suspend the cradle. The pair of bands (19, 19) of (18) are connected to the respective locking portions (1) of the foundation pipe (2).
After suspending the pedestal part (5) fixed between the lower ends of the bands (19, 19) in the foundation pipe (2) by suspending it with screws by fixing it to the pipes (5, 15), The lower part of the pedestal part (5) is filled with earth and sand, and the electric pole (9) is placed on the pedestal part (5) of the suspension pedestal (18), the foundation pipe (2) and the electric pole (9). The method for constructing a self-supporting utility pole is characterized in that the space is filled with earth and sand and the ground line portion (10) is filled with a quick-drying mortar (10 '). 2. A completely hollow base pipe (2) having a required length that traverses a groundwater vein and having a pair of locking portions (15, 15) formed in an upper end opening, and the base pipe (2). The locking part (1
A pair of bands (19, 1) that are fastened to the
While the pedestal part (5) is fixed between the lower ends of 9),
The cradle part (5) is provided with a suspension cradle (18) in which a regulating rod (23) defining the center point of the base pipe (2) is stretched in a cross shape, and a pair of convex portions is provided at both ends. (14, 14) are fixedly mounted, and a bolt and nut (17) is inserted and fixed on one side, and each of the convex portions (14, 14) of the rotary connection tool (13) is connected to the base pipe (2). ), The harpoon portion of the screw auger (1) is connected to the bolt nut (17) while being fitted in the respective locking portions (15, 15), and the base pipe (2) is grounded. The foundation structure for the built-in self-supporting utility pole, which can be screwed in.