JPH10122427A - Buried pipe laying method coping with differential settlement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct the gradient of a vitch main pipe by burying the vitch main pipe, surrounded by a surrounding body provided in a laying place, in the ground, then filling a hardening filler in the converged stage of ground subsidence and raising the vitch main pipe. SOLUTION: A vitch main pipe 6 is installed on a foundation member 5 in a laying place. Forms 16, 17 are provided around the periphery of the vitch main pipe 6 to previously provide space 11 corresponding to ground subsidence, above the vitch main pipe 6 to surround it, and fluidized earth 9 is filled between the forms 16, 17 to form a surrounding body 8. Fluidized earth 9 and earth to be refilled 10 are filled in regular order over the periphery of the surrounding body 8 to bury it. Afterwards, in the converged stage of ground subsidence with a space part 12 formed at the intermediate part of the vitch main pipe 6 and surrounding body 8, a hardening filler is filled in the space parts 11, 12 so as to raise the vitch main pipe 6 to straighten hanging. The gradient of the vitch main pipe 6 can thereby be corrected, so that waste and sediment are not accumulated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for laying down buried pipes such as sewer pipes in order to cope with uneven settlement.

[0002]

2. Description of the Related Art A typical example of a conventional underground pipe such as a sewer pipe will be described with reference to FIGS. 13 to 16. As shown in FIGS. A base material 5 such as sandy soil is spread on the bottom of an excavated portion 4 formed by excavating the ground 1 and a sewer main pipe 6 is placed thereon, as shown in FIGS. Then, the backfill material 15 is sequentially charged into the outer periphery thereof, compacted, paved, or the like, so that the sewer main pipe 6 is laid in the ground 1 as a straight pipe as shown by a chain line. However, when the ground 1 is soft ground or the like, as shown by the solid line due to differential settlement after the execution, there is a problem that the middle part hangs down, the flowability decreases, and dirt and earth and sand are deposited. .

[0003]

Therefore, in order to solve such a problem, the laying of the sewer main pipe 6 has to be conventionally performed. They had to replace or crush existing pipes and insert new pipes by the propulsion method. However, all of these construction methods require problems such as excavation of the ground or installation of a propulsion construction machine, resulting in large-scale construction, and the cost is high as in the case of new construction.

Accordingly, an object of the present invention is to solve the problems of the conventional laying method corresponding to the uneven settlement of a buried pipe as described above. The main pipe does not hang down even if the water is raised, and the drainage performance does not decrease and dirt and sediment do not accumulate. It is an object of the present invention to provide a method of laying a buried pipe that can cope with uneven settlement without requiring large-scale construction because no installation of machinery is required and the cost is low.

[0005]

In order to achieve the above object, the present invention provides a method for laying a buried pipe for burying a sewer main pipe in the ground, comprising the steps of:
After burying the enclosed sewer main pipe by providing a space corresponding to the ground subsidence in advance by the surrounding body at the laying place, at the stage where the ground subsidence has converged, fluidized treated soil or mortar etc. The method is characterized by injecting a filler having high fluidity and curability over time and causing the main pipe of the sewer to float by buoyancy generated by the injection.

[0006] The invention described in claim 2 or 3 is claim 1.
In the invention described in (1), the surrounding body is constituted by fluidized soil or a sheath tube.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 to 6 showing a first embodiment of the present invention, the same reference numerals are used for the same parts as those in the prior art and the parts common to each embodiment, and the description is omitted. The different parts will be mainly described. In the first embodiment of the present invention, a sewer main pipe 6 is installed on a foundation material 5 at a laying point, and a space corresponding to land subsidence is previously formed above the sewer main pipe 6 by molds 16 and 17 around its outer periphery. 11 is provided and surrounded, and fluidized soil is filled between the molds 16 and 17 to form an enclosure 8. It is buried by paving, etc. (Fig. 1,
2).

Then, as shown by an arrow in FIG. 3, land subsidence occurs, and the intermediate part of the surrounding body 8 and the sewer main pipe 6 hangs down by this land subsidence, and a space 12 is formed below. Land subsidence converges. Here, FIGS.
As shown in FIG. 1, a highly fluid and time-hardening filler 13 such as fluidized soil for filling or mortar is injected into the spaces 11 and 12, and the buoyancy generated by this causes the sewer main pipe 6 to flow.
Float to correct sagging. Then, the filler material 13 hardens with the passage of time, whereby the base portion and the periphery of the sewer main pipe 6 are reinforced, and long-term safety is ensured.

The second embodiment of the present invention shown in FIGS. 7 to 12 differs from the first embodiment only in that the surrounding body 8 is constituted by a sheath tube instead of the fluidized soil. Since there is no other difference, the detailed description is omitted.

[0010]

The present invention is as described above. According to the first aspect of the present invention, there is provided a method of laying a burial main pipe in the ground, wherein the laying portion is provided with a surrounding body by a surrounding body. After burying the sewer main pipe which was provided with a space corresponding to the land subsidence in advance, and at the stage where the land subsidence was converged, the fluidity of the fluidized treated soil or mortar in the space was high and the time was over. A curable filler is injected, and the sewer main is lifted by the buoyancy generated thereby.
In the invention according to claim 1, in the invention according to claim 1, since the surrounding body is constituted by fluidized soil or a sheath pipe, the ground is soft ground and uneven settlement after burying the sewer main pipe is performed. Even if it occurs, the slope of the sewer main can be corrected, so that the downflow performance does not decrease and dirt and earth and sand are not deposited, and in the construction of the method, ground excavation or propulsion construction machinery There is no need for installation, etc., so the construction does not become large and the cost is low,
In addition, the filler hardens as time passes, thereby reinforcing the foundation and surroundings of the sewer main pipe, and has the effect of ensuring long-term safety.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing an initial state of a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line 2-2 in FIG.

FIG. 3 is a vertical sectional front view showing a state in the middle stage of the above.

FIG. 4 is a sectional view taken along line 4-4 of FIG.

FIG. 5 is a longitudinal sectional front view showing a state at the end of the above.

FIG. 6 is a sectional view taken along line 6-6 of FIG.

FIG. 7 is a longitudinal sectional front view showing an initial state of a second embodiment of the present invention.

FIG. 8 is a sectional view taken along line 8-8 in FIG.

FIG. 9 is a longitudinal sectional front view showing a state in the middle stage of the above.

FIG. 10 is a sectional view taken along line 10-10 of FIG.

FIG. 11 is a longitudinal sectional front view showing a state at the end of the above.

FIG. 12 is a cross-sectional view taken along line 12-12 of FIG.

FIG. 13 is a vertical sectional front view similar to FIG. 1 of the laying method of the same kind as the present invention.

FIG. 14 is a cross-sectional view taken along line 14-14 of FIG.

FIG. 15 is a vertical sectional front view similar to FIG. 3 of the above.

FIG. 16 is a cross-sectional view taken along line 16-16 of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ground 2 Manhole 3 Manhole 4 Excavation part 5 Foundation material 6 Sewer main pipe 7 Space 8 Surrounding body 9 Fluidized soil 10 Backfill material 11 Space 12 Space 13 Filling material

Claims (3)

[Claims] 1. A method of laying a buried pipe in a ground where a buried pipe is buried in a laying place by a surrounding body in advance by providing a space corresponding to ground subsidence. Later, at the stage when the land subsidence has converged, a highly fluid and time-hardening filler such as fluidized treated soil or mortar is injected into the space, and the sewer main is lifted by the buoyancy generated by this. A method of laying a buried pipe corresponding to uneven settlement. 2. The method for laying a buried pipe according to claim 1, wherein the enclosure is made of fluidized soil. 3. The method of laying a buried pipe according to claim 1, wherein the surrounding body is constituted by a sheath pipe.