JPH0814350B2 - Civil engineering method for underground pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a method for civil engineering construction of underground buried pipes such as oil pipes, gas pipes, water pipes, and pipes for communication cables, and particularly improvement of construction efficiency. It is about.

[Prior Art] When burying oil pipes, gas pipes, water pipes, etc. in the ground, it is necessary to bury them at a certain depth or more from the ground surface to protect the oil pipes.

When burying these oil pipes and gas pipes, first, the road surface to be buried is torn down, the unit length is excavated to remove the earth and sand, and then earth retaining and water replacement. Next, a pipe is arranged in the excavated groove, and after being welded / joined with the previously buried pipe, backfilling is performed. When burying pipes in this way, civil works and piping work are performed in a series of sequence from the start to the end of construction.

Then, when forming the groove, the mountain retaining and water change should be performed with sufficient care to prevent the roadbed or the like from collapsing during the piping work. Also, when backfilling is performed after the pipe is placed, spread the earth and sand of the receiving back to the same thickness on the left and right so that the backfilling part does not receive unbalanced pressure. By carefully compacting the unloaded and unwound earth and sand with a rammer or tamper, compaction is performed to increase the watertightness and strength of the unwound earth and sand. This rolling is repeated to backfill the excavated trench.

[Problems to be Solved by the Invention] In the case of burying a pipe as described above, an ironworking work such as piping, welding, and inspection is performed between civil works such as excavation and backfilling. For example, if you work 8 hours a day,
After excavation work is performed for 3 hours, ironing work such as piping and welding is performed for 3 hours, and then backfilling work is performed for 2 hours. For this reason, the workers who are doing the civil engineering work are idle during the ironworking work, and the ironworking work is done only for 2 to 3 hours a day, and the civil engineering work is performed by 5 workers, welding, and inspection. Even if three workers perform the ironing work, etc., the burial distance per day is about 20 m, which is very inefficient.

Further, in order to secure the safety of the piping work, it is necessary to firmly mount the mountain and perform water replacement, which is not easy.

Further, when the pipes are aligned at the time of welding, if the squareness of the pipe end faces does not appear to a certain extent, the newly installed pipe is tilted slightly to the left and right and up and down to make the weld clearance uniform. Therefore, there is a disadvantage that the excavation hole needs to be wide and deep.

In addition, there is a disadvantage in that a large amount of good quality sand is required for backfilling, and it is expensive to carefully compact the sand.

Also, when actually installing a buried pipe and performing filling,
It is difficult to achieve sufficient compaction over the entire range of a long buried pipe, and in some cases there is a risk of insufficient compaction. If there is such an inaccurate rolling part, the buried part of the pipe will be depressed, and excessive earth pressure will act on the buried pipe, causing cracks in the pipe body or damage such as falling out of the diameter part. It had the disadvantage that it could cause an accident.

Further, if the civil engineering work takes a long time, the traffic regulation time becomes long, and there is a disadvantage that traffic congestion is likely to occur.

The present invention has been made in order to solve the above disadvantages, and proposes a civil engineering method such as underground burial that can efficiently perform the burial of pipes by separating the civil engineering work and the ironwork work such as piping. The purpose is.

[Means for Solving the Problem] A method for constructing an underground buried pipe according to the present invention is to secure a space having a U-shaped groove having a hollow space larger than a cross-sectional area of the buried pipe inside a groove formed by excavating earth and sand. Install the material with the U-shaped groove facing down, fill the groove on the space securing material to fix the space securing material, draw the embedded pipe into the intermediate space of the fixed space securing material, and then pipe the space. It is characterized in that the space between the securing material and the buried pipe is filled with a filling material.

[Operation] In the present invention, the space securing material having a hollow space is installed in the groove formed by excavating the soil, and the space securing material is prevented from collapsing the soil on the side wall of the groove, thereby eliminating the need for mountain retaining.

In addition, after installing the space securing material, the groove above the space securing material is backfilled to finish the civil engineering work, and the traffic regulation is lifted in a short time.

In addition, the piping work can be performed easily and quickly by blowing a pipe for embedding into the hollow space of the fixed space securing material.

Furthermore, by filling the hollow space after piping with the filling material to fix the buried pipe and covering the buried pipe with the filling material and the space securing material, the additional load such as vertical earth pressure acting on the buried pipe is reduced. You can

[Embodiment] FIGS. 1 (a) to 1 (f) are sectional views showing construction steps of an embodiment of the present invention. When burying the pipe 3 in the ground 1, first, as shown in FIG. 1 (a), the ground 1 is excavated by a unit length to form a groove 2 having a depth D that provides a predetermined soil cover. . Next, as shown in FIG. 1 (b), the groove 2 has a hollow portion 4 as a space securing member, and a U-shaped groove 5 made of concrete or steel is installed so that its upper portion is covered. By installing the U-shaped groove 5 in the groove 2 in this way, the sediment on the side wall of the groove 2 can be suppressed by the U-shaped portion of the U-shaped groove 5, and the work of the next step can be performed without clogging.

After installing all the U-shaped gutters 5 in the groove 2 formed by excavating the unit length, the upper part of the U-shaped gutter 5 is backfilled with earth and sand 6 as shown in FIG. Fix 5 At the time of this backfilling, since only the upper part of the U-shaped gutter 5 needs to be backfilled with the earth and sand 6, the backfilling soil can be reduced and the time for backfilling work can be shortened.

After the groove 2 is backfilled with the earth and sand 6, the asphalt concrete and the crushed stone 7 are spread on the earth and sand 6, and the groove 2 is completely backfilled by rolling.

After the groove 2 is backfilled, as shown in FIG. 2, a pipe / joining groove 8 having a size corresponding to the diameter and length of the pipe 3 to be buried is excavated in the pipe working portion. Through this piping / joining groove 8,
As shown in FIG. 1 (e), the pipe 3 is inserted in the hollow portion 4 of the U-shaped groove 5.
Pull in. Then, the front and rear pipes 3 provided in the hollow portion 4 are joined by welding or the like to form a pipe. Thereafter, as shown in FIG. 1 (f), the hollow portion 4 between the pipe 3 and the U-shaped groove 5 is filled with a filling material 9 such as styrofoam to fix the pipe 3. When the fixing of the pipe 3 is completed, the pipe / joining groove 8 is backfilled.

In this way, the hollow portion 4 of the space securing member including the U-shaped side groove 5
Since the pipe 3 for burying can be drawn in and piped,
The piping work can be performed easily and quickly.

Further, the pipe 3 is filled with the material 9 in accordance with the inside of the hollow portion 4 after the pipe 3 is fixed, and the buried pipe 3 is filled with the filling material 9 and the U-shaped groove 5.
By covering with, it is possible to significantly reduce the additional load such as vertical earth pressure acting on the buried pipe 3.

In this way, when the pipe 3 is buried, the civil engineering work and the ironing work such as entering can be performed separately. Therefore, it is not necessary to enter ironwork during civil engineering work, and if the arrangement of U-shaped gutters 5 and backfilling are sequentially performed after excavation, for example, when performing work for 8 hours a day,
Excavation work, array work and backfill work can be performed for 6 hours each day, and 5 workers can perform civil engineering work for 40 m.

Therefore, for example, if a distance of 80 m is buried, according to the conventional construction method, the civil engineering work and the ironworking work require four working days, but according to this embodiment, the civil engineering work is performed by five workers. The work can be performed in two days, and thereafter, as in the conventional case, three workers can perform the ironing work such as piping by one person, and the working days and the working man-hours can be significantly reduced.

In the above-mentioned embodiment, the case where the U-shaped dividing groove 5 is used as the space securing material for forming the hollow portion 4 in the groove 2 has been described, but a concrete box or a rectangular steel pipe having a hollow space as the space securing material is described. Even if a hard vinyl chloride pipe, a reinforced plastic pipe or the like is used, the same operation as in the above embodiment can be achieved.

[Effects of the Invention] As described above, according to the present invention, a space securing material having a hollow space composed of a U-shaped groove is installed in a groove formed by excavating the earth and sand, and the soil on the side wall of the groove collapses by the space securing material. Since this can be prevented, the retaining of the excavated trench can be omitted.

In addition, since only the upper part of the space securing material needs to be backfilled when performing backfilling, backfilling soil can be reduced and the cost and time for backfilling work can be reduced.

Further, the piping work can be performed easily and quickly by drawing the pipe for embedding into the hollow space of the fixed space securing member and piping it.

Furthermore, by filling the hollow space after piping with the filling material to fix the buried pipe and covering the buried pipe with the filling material and the space securing material, the additional load such as vertical earth pressure acting on the buried pipe is reduced. Therefore, it is possible to prevent the buried pipe from being damaged.

Further, since civil works such as excavation and iron works such as piping and welding can be performed separately, the pipe burying work can be efficiently performed.

In addition, since the traffic can be opened immediately after the completion of the civil engineering work, the traffic regulation due to the pipe burying can be minimized.

[Brief description of drawings]

1 (a) to 1 (f) are cross-sectional views showing a construction process of an embodiment of the present invention, and FIG. 2 is a perspective view showing a pipe / joining groove. 2 ... Groove, 3 ... Pipe, 4 ... Hollow part, 5 ... U-shaped groove,
6 ... Backfill soil, 7 ... Asphalt concrete, 8 ...
… Piping / joining groove, 9… Filling material.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kimio Sato 566-4 Karasawa, Fujisawa City, Kanagawa Prefecture (56) References JP-A-61-40937 (JP, A) JP-A-57-96142 (JP, A) Japanese Unexamined Patent Publication No. 2-183025 (JP, A) Actual exploitation Sho 56-71590 (JP, U)

Claims (1)

[Claims] 1. A civil engineering construction method in which a buried pipe is installed and backfilled in a groove formed by excavating earth and sand, and a space having a U-shaped groove having a hollow space larger than the cross-sectional area of the buried pipe is secured inside the groove. The material is installed with the U-shaped groove facing down, the excavated groove on the space securing material is backfilled to fix the space securing material, and the embedded pipe is drawn into the hollow space of the fixed space securing material to pipe the space. A civil engineering method for an underground buried pipe, characterized by filling a gap between the securing material and the buried pipe with a filler.