JP2005139614A - Spiral support - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that considerable expense and much time are required due to the necessity of digging up and re-erecting a support together with foundation so as to replace the support, when the support is deteriorated and damaged, because the conventional support is embedded in concrete so that the foundation can be created. <P>SOLUTION: A hole is opened in the center of a concrete foundation; the support, on which a torsion flat steel bar is mounted, is inserted into the hole; and crushed stones are stuffed between the hole and the torsion flat steel bar. Thus, in the replacement of the support, only the support can be pulled out, and easily replaced. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a support column that stands on a concrete foundation.

  Conventionally, when placing a support on a concrete foundation, as shown in Fig. 6, first dig a hole in the ground, solidify the bottom of the hole, and place a concrete foundation (4a) with a hole in the center on it. The soil is backfilled, and the column (6c) is placed in the hole in the foundation, and mortar is packed in between.

In the case of such a conventional support column, when the support column is worn out or damaged, it is necessary to dig up the foundation and replace it again in order to replace it.
Therefore, the present invention is intended to reduce cost and time by making it possible to easily replace only the support.

With reference to FIG. 1, which shows the basis of the present invention, a method for easily replacing the column will be described. First, the end of the flat bar (1) is left a little, and the tip is twisted to form the flat bar (2). Next, a concrete foundation (4) with a hole (3) in which a twisted flat bar is inserted in the center is made. Therefore, the concrete foundation is first installed in the ground.
Next, a twisted flat bar is inserted into the hole in the foundation and stood. At this time, the flat steel portion is left out of the surface of the foundation. Next, when the crushed stone (5) is dropped between the twisted flat bar and the hole and the crushed stone is hardened, the twisted flat bar is fixed.

  This twisted flat bar has a feature that it cannot be easily pulled out even if it is pulled straight. When pulled up, the spiral blade part tries to push up the crushed stone, but the crushed stone is pressed against the wall of the hole, and a large frictional force is not generated.

Therefore, when removing this, it can be easily removed by turning a twisted flat bar. Since this is a state where the spiral blade part is simply sandwiched between crushed stones, it can be easily removed by turning it along the inclination of the blade. In this way, twisted flat bars cannot be pulled straight, but can be easily pulled out by turning.
Therefore, if a spiral post is attached to this twisted flat bar, the post can be easily replaced.

Here, we are experimenting that twisted flat bars cannot be easily pulled out by putting twisted flat bars into the holes in the foundation and filling them with crushed stone.
First, prepare a foundation of a concrete cylinder with a diameter of 30 cm and a hole with a diameter of 11 cm in the center. Next, prepare a twisted flat bar with a width of 75 mm, a thickness of 9 mm, and a length of 400 mm. Therefore, a twisted flat bar was set up in the hole in the foundation, one was fixed with mortar grout, and the other was filled with crushed stone with a maximum particle size of 25 mm.

First, the experimental results when fixed with mortar grout will be described with reference to FIG.
FIG. 7 shows the relationship between the elapsed time from the start of drawing and the drawing resistance.
From the start of drawing up to 800 seconds, the resistance to drawing increases while the grout is compressed, and after 800 seconds, the compression of the mortar reaches its limit. At this time, the pulling-out resistance suddenly increases due to the restraint by the foundation having higher strength. When the pulling resistance reached 20KN, the foundation broke tensile.

Next, the experimental results when the crushed stone is filled will be described with reference to FIG. FIG. 8 shows the relationship between the displacement length after the start of drawing and the drawing resistance force. This shows that when crushed stones are packed, crushed stones are simply packed from the mouth of the hole, but the pulling resistance of 20KN is almost the same as when fixed with mortar grout.
The experiment was conducted four times, and when the crushed stone was thought to be loose, the pulling resistance was a low value. In this case, the foundation finally broke.

  From the above two comparative tests, it can be seen that the pulling resistance is substantially the same when fixed with mortar grout and when filled with crushed stone.

  When the conventional support is damaged, it is necessary to replace the foundation every time, which takes time and money. However, the spiral support of the present invention allows the support to be pulled out without changing the foundation. And when you set it up again, you can easily stand up again by removing the crushed stone in the foundation. As described above, there is an effect that the time for replacing the column is shortened and the cost is not increased.

  Next, embodiments using spiral struts will be sequentially described.

  First, a first embodiment based on claim 1 will be described with reference to FIG. FIG. 2 shows a structure in which a timber support (6a) is attached to a flat steel portion protruding on the foundation shown in FIG. In this case, a groove in which a flat bar is inserted is cut under the timber, a flat bar portion is sandwiched in the groove, and the column is tightened with a bolt to stand up.

  Next, a description will be given of how to replace the support column when it becomes obsolete or damaged. In this case, if you pull out while turning the column, it will come out easily. After pulling out, remove the crushed stone, set up a new column, and put the crushed stone again. In this way, the support can be replaced very easily in a short time.

  Next, a second embodiment based on claim 2 using this method will be described with reference to FIG. First, a twisted flat bar (2) obtained by twisting a flat bar into the pipe (7) is inserted and welded to form a column (6b). Next, make a concrete foundation (4) with a hole (3) in the center of the pipe.

Therefore, the concrete foundation is first installed in the ground. Next, insert the column into the hole in the foundation and set up the column. At this time, put the pipe part in the hole a little. Therefore, crushed stone is dropped between the pipe, the twisted flat bar, and the hole in the foundation with the column upright. Then, when the crushed stone is hardened, the column is fixed.
If you put mortar (8) in between, it will be ready.

  Next, if you want to remove it for replacement, remove the mortar and turn the column to remove it easily. After pulling out the column, you can remove the crushed stone, set up a new column and put the crushed stone again.

 FIG. 4 shows a wooden fence as a third embodiment based on claim 1. As shown in Fig. 1, a concrete foundation (4) with a hole in the center is placed side by side on the ground, a twisted flat bar (2) is inserted into the hole in the foundation, and a crushed stone is placed between the twisted flat bar and the hole. Drop down and harden. Then, a wooden rod support (6a) is attached to the tip of a twisted flat bar, and a square is passed between the supports to form a fence.

Next, FIG. 5 shows a guardrail as a fourth embodiment based on claim 2. Although it is the same as the thing shown in FIG. 3, the hole (3) into which a pipe enters beforehand is opened on the concrete wall surface (9). A pipe (7) with a twisted flat bar (2) attached is inserted into this hole, and crushed stones are dropped between them and hardened. And between the support | pillars is connected with the steel plate of the guard rail, and the guard rail is formed.

  Thus, the spiral pile of the present invention can be used by making a hole in a concrete foundation or block, and thus has a wide range of use.

The front view of this invention foundation. 1 is a front view of a first embodiment of the present invention. The front view of 2nd Example of this invention. The front view of this invention 3rd Example. The front view of 4th Example of this invention. Traditional struts and strut foundations. A graph of an experiment with a twisted flat bar fixed with a mortar grout. Graph when experimenting with twisted flat bars fixed with crushed stones.

Explanation of symbols

1 flat bar 2 twisted flat bar 3 hole
4, 4a Foundation 5 Crushed stone
6a, 6b, 6c strut
7 Pipe 8 Mortar 9 Wall

Claims (2)

  Make a twisted flat bar with a twisted tip, leaving the end of the flat bar, and then make a concrete foundation with the hole into which the twisted flat bar is inserted, and embed this foundation in the ground. Next, insert a twisted flat bar into the hole in the foundation so that the end flat bar part protrudes from the surface of the foundation, and then drop crushed stone between the twisted flat bar and the hole. Spiral strut characterized by attaching a strut to the end of the steel. Twist a flat bar to make a twisted flat bar, insert the tip of this flat bar into the pipe and weld it to a column, and then make a concrete foundation with a hole in the center of the pipe. The base according to claim 1, wherein the foundation is embedded in the ground, and then a pillar is inserted into the hole in the foundation, and a crushed stone is dropped between the pipe, the twisted flat bar, and the hole. Spiral prop.

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