JPH07113213B2 - Mounting method of sinkage measuring rod in underground - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to an improvement in a method of attaching a sinking amount measuring rod in an underground buried object.

<Prior art and problems> When constructing manholes or drains, if underground buried objects (gas pipes, water pipes, cables, etc.) exist near the excavated site, the buried objects will loosen the ground and cause groundwater. There is a risk of subsidence due to springing up.

Therefore, it is necessary to measure the subsidence amount of the buried object after the construction of the manhole and the like. For this reason, conventionally, the buried site of the above-mentioned buried object is excavated, and as shown in FIG.
, The lower end of the rod 2'is bound to this ring, and then backfilling is performed, and the subsidence amount of the buried object is measured from the displacement amount of the upper end of the rod. In FIG. 4, 3'denotes a plastic pipe for preventing intrusion of sediment.

However, in order to tie the two split rings together, it is necessary to excavate just below the buried object, inevitable weakening of the foundation that supports the buried object, and a sewer pipe with a diameter of 600 mmφ or more. In this case, the backfilling area will be considerably large, and until the large amount of backfilling soil has hardened, the settlement of the buried material will occur significantly. Therefore, there is a concern that the buried object may be damaged.

<Object of the Invention> An object of the present invention is to provide a method of mounting a sinkage measuring rod capable of sufficiently reducing the sinkage of a buried object after backfilling.

<Structure of the Invention> The method of mounting the sinkage measuring rod in the underground buried object according to the present invention is such that the upper surface of the underground buried object is exposed by excavating to a depth reaching the upper surface of the underground buried object, and the exposed upper surface The method is characterized in that the lower end of the rod is fixed with an adhesive, and then backfilling is performed to expose the upper end of the rod on the ground.

<Description of Embodiments> The present invention will be described below with reference to the drawings.

In FIG. 1, m is the manhole to be constructed, P is the buried pipe to be measured for settlement, and only the buried pipe existing above the diagonal line of 45 ° from the lower corner O of the manhole is the measurement target. .

According to the present invention, the subsidence amount measuring rod is attached before the excavation work on the manhole construction site.

In order to carry out the present invention, as shown in FIG. 2A, the buried pipe upper surface S is exposed by excavating to a depth reaching the buried pipe upper surface S. After that, the mounting member 1 is fixed to the upper surface of the exposed pipe with an adhesive (for example, epoxy resin), and the lower end of the rod 2 is screwed to the screw hole projection 11 of the mounting member 1. The arc angle θ of the mounting bracket 1 is normally 2π / 6 to 2π / 8, and the exposed height h of the pipe for bonding the mounting bracket 1 is h.
Is the pipe diameter D, And under θ = 2π / 6 to 2π / 8, h≈0.07 to 0.
It is 04D. Especially, it is desirable to set h = 1 / 20D.

After the lower end of the rod body 2 is bonded to the buried pipe in this manner, a plastic pipe (vinyl chloride pipe) 3 is inserted to prevent the rod body 2 from entering the earth and sand as shown in FIG. 2B.
After carrying out primary backfilling (shown by 4) and sufficiently rolling, as shown in FIG. 2C, a concrete block 5 is laid and a protector (made of cast iron) 6 is placed and backfilled to the local board. (Indicated by 7).

Thus, by opening the lid of the protector, the upper end of the rod can be exposed on the ground, and the sinking amount of the rod can be measured, for example, as follows. As shown in FIG. 1, a measurement reference point A is provided at a position that does not affect excavation. Place the level gauge where the reference point A and the upper end B of the rod can be seen.
Set a box measure at reference point A and read the height. Open the lid of the protector and place a box measure on the top of the stick to read the height. Repeat the work from time to time according to the progress of construction to measure the subsidence amount of the pipe.

In the above, as shown in FIG. 3A, wedge-shaped spacers 8, 8 may be fixed to the exposed upper surface of the pipe with an adhesive, and the fitting 1 may be fixed on these spacers. An adhesive may be used to fix the mounting bracket, but the third
As shown in FIG. B, a fitting method using a dovetail groove and a ridge can be used, and as shown by 9 in FIG. 3B, a screw fixing method can be used together.

<Effects of the Invention> As described above, according to the method of attaching the sinkage measurement rod in the underground buried object according to the present invention, since it is sufficient to perform the excavation to the extent that only the upper surface of the buried pipe is exposed, it is possible to directly under the buried pipe. Compared to the conventional method that requires excavation, the ground directly under the buried pipe can be retained as the original solid ground, and backfilling at both ends of the pipe is unnecessary, and the backfilling amount can be reduced accordingly. Therefore, loosening or softening of the ground in the burial ground can be eliminated well, and the subsidence amount measuring rod can be attached to the burial pipe, and the subsidence of the burial pipe after backfilling can be limited to a slight one. .

[Brief description of drawings]

FIG. 1 is an explanatory view showing a method of measuring the subsidence amount of an underground buried object using a measuring rod attached according to the present invention, FIGS. 2A and 2B.
In addition, FIG. 2C is an explanatory view showing a work procedure of the measuring rod mounting method according to the present invention, FIG. 3A is an explanatory view showing another embodiment of the present invention, and FIG. 3B is a b in FIG. 3A. 4B is a sectional view and FIG. 4 is an explanatory view showing a conventional example. In the figure, S is the upper surface of the underground buried object, 1 is a mounting bracket, 2
Is a stick.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tadayuki Matsumoto 3-3-2 Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture Kansai Electric Power Co., Inc. (72) Koji Ohsako 3-chome Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture No. 22 Inside Kansai Electric Power Co., Inc. (72) Inventor Satoshi Mizouchi 3-3 Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture No. 22 Inside Kansai Electric Power Co., Inc. (72) Masaru Kitada 3-3 Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture No. 22 in Kansai Electric Power Co., Inc. (72) Inventor Yoichi Sasaki, 3-1, 7 Chisune, Nishiyodogawa-ku, Osaka-shi, Osaka Prefecture Ryosei Electric Co., Ltd. (72) Inventor Masahiro Kataho Chifune, Nishi-yodogawa-ku, Osaka City, Osaka Prefecture 3-17 No. 1 Ryosei Densetsu Co., Ltd. (72) Inventor Nobuo Hiroyama 4-4-12 Nakagagaya, Suminoe-ku, Osaka City, Osaka Prefecture Suminoe Kogyo Co., Ltd.

Claims (1)

[Claims] 1. Excavation is performed to a depth reaching the upper surface of the underground buried object to expose the upper surface of the underground buried object, and the lower end of the rod is fixed to the exposed upper surface with an adhesive. Done,
A method for mounting a sinking amount measuring rod in an underground buried object, characterized in that the upper end of the rod is exposed from the ground.