JPH0260804B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION When installing, for example, traffic regulation sign poles, curved mirror poles, etc. on the ground surface, the present invention can be installed in a foundation pipe installed underground or in a cylindrical excavated hole. After planting the poles, the first step is to fill the foundation pipe or cylindrical excavation hole with gravel, and the second step is to inject a rapidly hardening cement solution into the gravel in the foundation pipe or the excavation hole to harden and harden it. An object of the present invention is to provide a method for constructing a concrete body for installing a pole.

As shown in Fig. 1, the pole installation method according to the conventional technology is as follows: First, the foundation pipe 1, which is a hollow pipe of planned length and diameter with the upper and lower ends open, is driven into the ground, and then the foundation pipe is installed by any means. The soil in 1 was removed to create a cavity 2 as shown in Figure 2, and a pole 3 was planted in the cavity 2 as shown in Figure 3. After making a slightly viscous solution and mixing it with water, it begins to set after about 3 to 5 minutes, and after that it hardens to the same hardness as regular cement over time. A hard cement solution is mixed in a container such as a plastic bucket, injected and filled into the cavity 2 of the foundation pipe 1, and the vertical upright state of the pole 3 is supported until it solidifies, and the foundation pipe 1 and pole 3 are bonded to the hardened cement body 4. The pole 3 was installed in an integrated state.

Now, the important element in such a method is that the foundation pipe 1, which is integrated with the pole 3 by the cement hardened body 4, must exhibit sufficient lateral pressure resistance underground. The foundation pipe 1 needs to have a considerably larger diameter than the pole 3 and a calculated length, which creates a considerable amount of space between the foundation pipe 1 and the pole 3. It will be done.

Of course, the void also has the advantage of sufficiently absorbing the error with the pole 3 which is intended to stand vertically if the foundation pipe 1 is accidentally laid at a slight inclination, and the cement hardened body 4 is also sufficient. Due to its thickness, the integral strength of the foundation pipe 1 and the pole 3 is also sufficient.

The cement used in this case is made into a solution when mixed and has rapid hardening performance.
The property of creating a solution that mixes cement and water in a container without going through the troublesome process of mixing the four components of sand, gravel, and water, allowing it to reliably penetrate and fill even the smallest voids. Therefore, when the aggregate used as a reinforcing material is made of ordinary particles such as sand, when mixed with water, only the aggregate actively settles to the bottom of the container and cannot be stirred sufficiently. requires a special material that becomes fine particles on the same level as cement, which is in the form of a solution and rapidly hardens, and requires various additives to achieve sufficient hardness, which is quite expensive. If aggregate is mixed in, the material becomes quite expensive and becomes impractical, so it is necessary to find a way to utilize inexpensive gravel as the aggregate.

If gravel could be used effectively, it would of course be sufficient aggregate, but it would also be possible to reduce the amount of rapidly hardening cement used by about half, which would greatly reduce the construction cost. This makes it possible to measure costs.

Therefore, if we use a common-sense means of mixing gravel when mixing the cement solution in a plastic container, the gravel will actively settle at the bottom of the container, making the stirring operation extremely difficult and inefficient. Even if these inconveniences are alleviated by dredging and sufficiently stirred, when pouring this into the foundation pipe 1, the lower end of the pole 3 is at the center of the foundation pipe 1, and the length of the pole is at the center of the foundation pipe 1. The container is placed in an inclined state touching the top side, and when cement solution is injected into this state, the cement solution first drains from the container and the precipitated gravel is not completely drained. When the entire amount of gravel is finally discharged, the gravel that precipitated in the foundation pipe 1 fills the cavity 2, making it difficult to verticalize the tilting pole 3, wasting time. Then, the cement solution begins to solidify, making it impossible to vertically correct the pole 3.

Therefore, in order to avoid this situation, the pole 3 must be firmly fixed vertically by another person or by another supporting means before pouring the cement solution, which also requires a complicated operation. It is something that will be done.

In order to meet such requirements, the present invention, as a first step, sequentially fills gravel 5 from the bottom of a foundation pipe 1 with poles 3 planted thereon, as shown in FIG. As shown in FIG. 5, when the foundation pipe 1 is filled with gravel 5 up to the vicinity of its upper end, the pole 1 is held almost vertically fixed.

Next, in the second step, as shown in FIG. 6, when a cement solution made of cement is injected, the cement solution penetrates into the pores of the gravel 5 very smoothly, and immediately fills all the pores of the gravel 5 and solidifies. Then, as time passes, a strong concrete body 6 is formed.

That is, in the present invention, as a first step, gravel 5 is filled into the foundation pipe 1 in which the poles 3 are planted, and
A strong concrete body 6 is created by holding the pole 3 to be planted in the foundation pipe 1 by a two-step method in which a rapidly hardening cement solution made by dissolving cement is injected and penetrated in the second step. It is.

In the above embodiment, the foundation pipe 1 was installed underground, but as shown in FIG. 7, instead of driving the foundation pipe 1 underground, it was installed underground. A corresponding cylindrical hole was excavated, a pole 3 was planted in the hole, and gravel 5 was filled in the first step according to the above embodiment, and then a cement solution was injected and penetrated into the hole in the second step. Of course, it is also possible to construct a concrete body 6 that holds the pole 3, and the effect is not much different.

However, in this case, if the construction geology is a gravel stratum, the area around the hole may collapse and the cylindrical hole cannot be excavated, resulting in an inverted truncated pyramid-shaped hole. Since the cement solution to be used permeates into the gravel layer around the hole, geological restrictions may have to be met due to the instability of the amount of cement solution used.

As described above, the present invention mixes the gravel 5 and the cement solution into a ready-mixed concrete state by separately filling and injecting the gravel 5 and the cement solution into the foundation pipe 1 in which the poles 3 are planted or into the excavated hole. There are great advantages to this, such as creating a concrete body 6 with the same strength as that of the filled concrete body 6 and obtaining a stable installation effect for the pole 3.

[Brief explanation of the drawing]

Figures 1 to 4 are explanatory diagrams of pole construction according to the prior art, Figures 5 to 7 are explanatory diagrams showing examples of pole construction of the present invention, and Figures 5 and 6 are illustrations of foundation pipes. An example of pole construction when installed is shown, and FIG. 7 shows an example of pole construction in a cylindrical excavated hole instead of a foundation pipe. 1... Foundation pipe, 3... Pole, 5... Gravel, 6... Concrete body.

Claims (1)

[Claims] 1. After planting a pole in a cavity demarcated by a foundation pipe installed underground or in an excavation hole excavated into the ground, the top side of the cavity or excavation hole demarcated by the foundation pipe as a first step. Filling the pole with gravel up to the vicinity to establish the vertical state of the pole, and then, in a second step, injecting and filling the cavity defined by the foundation pipe or the excavated hole with a rapidly hardening cement solution to set and harden it, A method for constructing a concrete body for pole installation, characterized in that a concrete body is created.