JPS59367Y2 - Subsidence prevention device for poles, piles, etc. - Google Patents

Description

[Detailed Description of the Invention] The present invention mainly relates to a subsidence prevention device that is attached to the tip of a pole when constructing a pole, pile, etc. (hereinafter simply referred to as a pole) on soft ground.

In particular, there are many places with soft ground in areas surrounding rivers, and poles for power transmission, power distribution, and communication, as well as tramway poles on railway tracks, etc., constructed in these soft ground areas will deteriorate over time due to the weight of the poles. sink.

Furthermore, even if poles that have tilted due to subsidence are supported by stretching wire ropes, it is difficult to repair tilted poles, and the height of the poles also becomes low, often requiring changes to the facility.

Conventionally, when constructing poles on soft ground, there is a method in which the tip (or end) of the pole is made of concrete, iron plate, etc., larger than the diameter of the pole to increase the supporting capacity.

However, in this case, in order to bury the tip, it is necessary to excavate a hole several times the area of the pole's base, which increases the construction cost and also requires that the surrounding area be sufficiently wide when installing. Since construction is not possible without it, this method limits where it can be built.

In addition, methods such as those shown in FIGS. 1 to 4 have also been considered.

That is, a method of fixing the crosspiece member 2 to a predetermined location of the root of the pole 1 and burying the crosspiece member 2 so as to place it on the stepped portion 4 (see Fig. 1), and assembling the crosspiece member 2 and the holding member. A holding member 3a such as a log is placed on the bottom of the hole in a direction perpendicular to the horizontal member 2 (see Fig. 2), or a cobblestone or chestnut stone 3b is laid as a holding member (see Fig. 3).These holding members There is a method in which the tip of the pole 1 is placed on top of the pole, and a method in which the cross member 2 is used and the ground stabilizer 3C is filled (see FIG. 4).

By the way, in the case of Fig. 1, a hole for mounting the crosspiece member 2 must also be excavated as a hole for installing the pole.
Excavation takes time, and the pole cannot be erected unless the area is several times larger than the base area of Pole 1.

Furthermore, this method has little effect on preventing subsidence.

In the case of Fig. 2, although this is an effective method for preventing subsidence to some extent, it requires excavating a hole 5 large enough to accommodate the holding member 3a, which requires sheet pile digging, which requires a large amount of labor in the excavation work. However, the area where excavation is possible is limited, and it is impossible to erect the pole 1 in a narrow place.

Additionally, the composition of the ground is disturbed during excavation.

In the case of Figure 3, the work is simple, but it is hardly expected to have any effect in preventing subsidence, since it is simply a row of cobblestones and chestnut stones.

The case shown in Fig. 4 is not very useful because the use of stabilizers may have an adverse effect on crops when applied to fields or the like.

The present invention aims to eliminate these drawbacks and provide a subsidence prevention device that can be constructed by drilling a round hole slightly wider than the base area of the pole.

An embodiment of the present invention will be described below with reference to the accompanying drawings.

The present invention includes a tip fitting 7 attached to the tip 6 of the pole 1, and a ring body 8 with a wing plate attached to the tip.
It is composed of.

The tip fitting 7 is constructed as follows.

A flat pole mounting plate 9 whose outer diameter is slightly larger than the outer diameter of the pole 1 is provided at the upper end. A flange 10 formed with a large inner diameter is integrally provided.

Further, a plurality of bolt holes 11 are drilled at predetermined locations on the side wall circumferential surface of the flange 10, and bolts 12 can be screwed into the bolt holes 11 to tighten and fix the pole 1 to the lower end 6. It's like that.

The flange 10 is formed into a circle when the cross section of the tip of the pole 1 is circular, and a square when the cross section of the tip of the pole 1 is square, and is formed to correspond to the shape of the cross section of the tip of the pole 1.

A cylindrical ring body receiving part 13 having the same center point is provided on the lower surface of the pole mounting plate 9.

The outer diameter of the ring body receiving portion 13 is the same as the ring 18.23 described later.
It is formed to have a diameter slightly smaller than the inner diameter of the ring 18 and the same thickness as the ring body 8 or slightly larger so that the ring body 8 can be smoothly inserted.

A slide portion 14 formed into an inverted triangular pyramid shape is continuously provided integrally with the lower end edge of the ring body receiving portion 13 .

The outer circumferential surface of the slide portion 14 is preferably shaped to provide less frictional resistance when penetrating into the ground.

Note that the slide portion 14 is preferably formed hollow.

This slide portion 14 includes a blade plate 20a20, which will be described later.
In order to expand b wider than the inner diameter of the ring 18, a plurality of slide protrusions 15 as shown in FIGS. It is best to fix it by fastening, welding, etc.

The tip of the sliding protrusion 15 is flush with the circumferential surface of the sliding portion 14, but the lower end is preferably tapered to a height of about half the width of the ring 18. A rod 16 of a predetermined length is screwed and welded to the rod 16, and a flat holding plate 17 is fixed to the tip of the rod 16 by means of bolts 17a, welding, or the like.

Next, the ring body 8 is constructed as follows.

The inner diameter of the ring 18 is slightly larger than the outer diameter of the ring body receiving part 13, and the outer diameter is formed to be equal to or slightly smaller than the outer diameter of the pole mounting plate 9. The outer diameter of the plate 9 and the outer diameter of the ring body receiving portion 13 are determined relative to each other.

The ring 18 also has holes 19a and 19b spaced at equal intervals.

19C, 19d are bored, and the slide portion 1 has a slide protrusion 15 as shown in FIGS. 7 and 8.
4, a notch groove 18a is cut at a location corresponding to the slide protrusion 15.

At least four blade plates 2 are provided on the upper and lower surfaces of this ring 18.
0 a and 20 b are movably fixed.

The blade plates 20 a and 20 b are flat plates that are the same as or slightly larger than the outer diameter of the ring 18 , and have a gap equal to the diameter of the rod 16 so that the rod 16 can be inserted through the center of the ring 18 . It is formed by dividing a circular plate into two parts, and is made up of two vane plates 20 a and 20 b with their divided surfaces facing each other.

The end portions of the blades 20a, 20b have holes 21a, 21
b is bored, and the hole 19a, 1 of the ring 18
The two pairs of blade plates 20 a and 20 b are movably arranged and fixed on the upper and lower surfaces of the ring by countersunk screws 22 a and 22 b of 9 b so that the gaps between the two pairs intersect.

It is preferable that these four blade plates 20 a and 20 b are arranged so that when they are spread out and fitted into the ring body receiving part 13 , their ends are overlapped with each other.

A ring 23 having the same shape as the ring 18 is connected to the ring 18 at least at one point by a connecting portion 24 so as to have the same central axis as the ring 18, adjacent to the lower side of the blade plates 20a and 20b attached to the lower surface of the tongue 18.

The ring 23 is placed at a position where it does not come into contact with the blades 20a, 20b attached to the lower surface of the ring 18, and the connecting portion 24 is placed at a position where it does not become an obstacle when the blades 20a, 20b are expanded. It is being

Furthermore, when using the ring 18 provided with the notched groove 18a, the ring 23 is similarly provided with the notched groove 23a.

When implementing the device of the present invention configured as described above,
After vertically drilling a round hole 25 slightly larger than the outer diameter of the pole 1 mounting plate 9 at the location where the pole 1 is to be erected, insert the flange 10 of the mounting bracket 7 into the tip 6 of the pole 1 and tighten the bolt 1.
2, the ring body 8 is tightened and fixed, and the ring body 8 is attached to the rod 16.

Then, the pole 1 is inserted perpendicularly to the round hole 25 until it reaches the bottom surface of the hole 25.

When the ring 23 reaches the bottom surface, it descends under the weight of the pole 1, and the inner surfaces of the vanes 20a and 20b gradually expand in the horizontal direction along the circumferential surface of the slide portion 14 or the surface of the slide protrusion 15. Gradually it sinks into the ground.

When the inner surfaces of the vanes 20 a and 20 b are pushed out to the inner peripheral surface of the ring 18 or the inner surface of the notch groove 18,
The ring 18.23 is fitted into the ring body receiving portion 13 and fixed to the lower end of the pole 1.

The results of this experiment are as follows. Slide part 14 has iron plate thickness of 3.2% Weight 16Kf Taber 1/1 Ring body 8 has iron plate thickness of ring 131X Blade 9% Rin Diameter Before opening 45 countries opened The area of the rear 73cIR was 0.159 m2 before the blades were expanded, but it was 0.3691112 in the expanded state, and the weight of the device was 28 kg.

The area in the expanded state is approximately twice as large.

This is New Year's Day 39 cm in diameter, 15 m in length, and weighs 350 kg.
When using a pole with an opening area of 0.119 m2, the area ratio of the pole opening to the blade when expanded is approximately 3.1 times.

If the ground can withstand a vertical load of 2000 kg, it can withstand a load of 6200 kg.

In addition, the bending moment of each blade is approximately 3500 kg.
and if 4 blades are used, 4 x 3500
Since kg = 14000 kg, it can sufficiently withstand the weight of the pole.

When comparing this with the construction method in the US as shown in Figure 16, when using a CP of 13 m and 350 kg, the state of subsidence is the total of cello level Kara.

According to the present invention configured as described above, the pole can be erected by simply digging a round hole with a diameter slightly larger than the diameter of the pole on New Year's Day, but the structure of the soil can be changed by the conventional round hole erecting method. Pole can be installed without disturbing it.

Therefore, there is no need for a sheet pile trench, and the time and labor required for excavation can be reduced.

It can also be installed in narrow places, such as between gutters and the edge of the road, or on paths in fields.

Further, the weight of the pole causes the slat to sink into the ground in the horizontal direction, and the expanded area of the slat is sufficient to withstand the weight of the pole.

Furthermore, since the moment of curvature of the vane is large, it is possible to prevent the pole from sinking.

It is also a useful idea that can be used on reclaimed land where the ground is soft and when constructing foundations for buildings.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention.
The figure is an explanatory diagram of the conventional construction method, Figure 5 is a perspective view of the assembled state,
6 is a partial sectional view taken along the line A-A in FIG. 5; FIG. 7 is a perspective view of another embodiment in an assembled state; FIG. Figure 9 is a plan view of the ring body, Figure 10 is a bottom view of the same, Figure 11 is a CC sectional view of Figure 9, Figure 12 is a DD sectional view of Figure 9, and Figure 13 is a wing spread. Fig. 14 is a state diagram when the device according to the present invention is inserted into the mounting hole, Fig. 15 is a state diagram when the load of the pole is applied, and Fig. 16 is shown in the experimental example. This is a diagram of the conventional construction method. Explanation of symbols 1 is a pole, 7 is a tip mounting bracket, 8 is a ring body, 13 is a ring body receiving part, 14 is a slide part, 16 is a rod, 17 is a holding plate, 18.23 is a ring, 20a,
20 b is a wing plate.

Claims (3)

[Scope of utility model registration request] (1) A flange 10 with an inner diameter slightly larger than the tip end of the pole 1 is provided on the upper surface of the pole mounting plate 9, and a flange 10 with an outer diameter slightly smaller than the inner diameter of the ring 18 is provided on the lower surface. A ring body receiving part 13 having a cylindrical shape of about 100 mm and a sliding part 14 having an inverted triangular pyramid shape are integrally arranged,
and a tip mounting bracket 7 which is integrally stepped with a rod 16 having a holding plate 17 fixed to the tip of the slide portion 14, and a ring body receiving portion 13.
A pole mounting plate having an inner diameter slightly larger than the outer diameter of the pole mounting plate 9, and a gap for insertion of a rod 16 provided in the center of each pair on the upper and lower surfaces of a ring 18 having an outer diameter approximately equal to or slightly smaller than that of the pole mounting plate 9. Feather plates 20a, 20 with an outer diameter equal to or slightly smaller than 9
The ring body 8 is movably fixed with countersunk screws 22 a and 22 b so that the gaps b intersect, and the ring 18 and the ring 23 are connected at least at one place via the lower blade plates 22 a and 22 b. Subsidence prevention device for poles, piles, etc. (2) The subsidence prevention device for poles, piles, etc., according to claim 1, wherein the flange 10 has a circular or square shape. (3) Slide protrusions 15 are provided at predetermined intervals on the circumferential surface of the slide portion 14, and notched grooves 18a, 23a are provided on the ring 18.23 at positions corresponding to the slide protrusions 15.
The pole set forth in paragraph 1 of the claims for utility model registration,
Subsidence prevention device for piles, etc.