JP2885199B2 - Underground burial method for pipelines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to underground <br/> method in line, in particular, the conduit using the drilling waste soil caused by excavation of the surrounding ground of the various tubes, such as gas, electricity and water Land of
It relates to the lower burial method.

[0002]

2. Description of the Related Art In recent years, the use of underground spaces such as basements of buildings, subways, underpasses, underground shopping malls, and underground parking lots has been extremely increasing. In these underground works, a huge amount of excavated soil is generated, and its disposal is taken up as a social problem. In this kind of underground construction, since an underground space is basically created, excavated soil is unnecessary, and it is impossible to create an underground space without generating it. As a method of using the excavated soil, it has been conventionally used as earth and sand to fill a gap between a structure made by underground construction and an excavated portion.

[0003] As a method of using the excavated surplus soil for backfilling, there are methods of using the surplus soil as backfill soil as it is,
A method in which a binder such as quicklime or cement is added to and mixed with the excavated surplus soil, and the surplus soil is improved to a plastic state and used as backfill soil. There is known a method in which a slurry is added to the slurry to modify it into a hardenable residual soil slurry and use it as backfill soil.

[0004]

However, backfilling pipes using these methods has the following technical problems.

[0005] That is, in the above method, the properties of the remaining soil are good and can be adopted only when, for example, soil of the same quality as mountain sand is generated, and such high-quality soil is limited. Available amount is small. In addition, it is difficult to predict how much good soil will be generated at which point in time, and there is also a problem that a construction plan cannot be made. In addition, backfill soil generally needs to be stocked for several months, but at this time, it occupies a large area and may hinder construction work.

[0006] On the other hand, in the first method, the properties of the backfill soil improved in soil quality are dry, and particularly in the case of clayey soil, hard aggregates are formed, and the state is close to the state of lumps. If the soil in such a state is not sufficiently compacted by rolling by a machine at the time of backfilling, not only the strength is deteriorated, but also the settlement or the sinking is caused. In addition, since the pipeline is generally narrow, it is difficult to mount the compactor. Even if rolling is possible, if the backfill soil is rolled, lateral force and vibration are applied to the pipe, and there is a risk of breakage. In addition, the rolling operation must be performed carefully so as not to damage the pipe, which leads to an increase in the construction period. Furthermore, the loose-shaped improved soil has many gaps, is bulky, has poor transportation efficiency, and requires a large space for stocking.

[0007] On the other hand, in the other method, the residual soil slurry is not only scattered and soiled at the time of construction, but also a relatively large amount of water is added, so that the amount of cement required to solidify to a predetermined strength increases. . In addition, since the slurry is in the form of a slurry, its initial strength is very low, and the strength gradually increases thereafter. Therefore, the construction period is prolonged, and there is a problem in the case where it is necessary to refill immediately as in the case of road construction. It is necessary to maintain appropriate fluidity of the residual soil slurry, but for this purpose, the amount of water and the like must be adjusted according to the properties of the excavated residual soil, and its management is very troublesome.

The present invention has been made in view of the above-mentioned drawbacks, and has as its object the purpose of the present invention which does not require a large area at the time of stocking and transportation, has a relatively large initial strength, and is fastened at a construction site. It is an object of the present invention to provide a method of burying pipes underground , which does not need to be solidified and can shorten the construction period.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention excavates ground around a scheduled pipeline ,
The excavated soil generated by excavation is mixed with the ashes, as well as clay such as bentonite and kaolin to form a block under pressure, and the obtained block is placed at the bottom of the drilling hole.
The conduit is placed on the lock, the block around the conduit
The characterized in that the loading (claim 1).

[0010] In the present invention, the properties of the excavated soil to be blocked are not limited, but, for example, earth and sand, sandy soil, gravel soil, etc., having a high clay content are used. However, if the particle size of the gravel is too large (2 to 3 cm or more), it becomes difficult to perform pressure molding. Also,
Since the excavated soil and incineration ash and clay such as bentonite and kaolin are mixed, the properties, strength, density, water resistance, water shielding and the like when blocked are improved. The pressure is preferably about 5 to 100 kgf / cm2.

When the excavated soil is blocked, lime-based (slaked lime, quicklime), cement (ordinary Portland cement, early-strength Portland cement, blast furnace cement, fly ash, other special cement), gypsum,
Pressurization may be carried out in a state where a curable material (binder) such as blast furnace slag slag powder, asphalt, water glass natural polymer, or synthetic polymer is added alone or in combination of two or more (claim 2).

Further, when the excavated soil is blocked,
Cotton, pulp, hemp, wool and other natural fibers, polyethylene,
Synthetic fiber such as polypropylene and acrylic, carbon fiber,
Various fibers such as glass fibers and metal fibers may be added alone or in combination of two or more. The thickness of the fiber can be used from a very small diameter of about several μm to a very thick of 1-2 mm.
A single fiber or a twisted fiber may be used. The length of the fiber is about 5 mm to about 5 cm. Generally, when the fiber length is about 2 cm or more, the fibers become entangled and become dango-like when mixed, so that the length is desirably less than this length.

As the size of the block, various shapes are adopted in consideration of the places and functions to be buried, and it is recommended that the size of the block is about a brick for a small one and about 1 m square for a large one. If the backfill location is to be re-excavated, for example, one with a hanger may be employed to facilitate removal. Depending on the function required for the backfill portion, the blocks are simply stacked vertically and horizontally, but if fixing and water-blocking of the blocks are required, a plugging material such as mortar may be filled between the blocks. ).

In the practice of the present invention, backfilling is performed only with the excavated soil remaining in the block, but other materials, for example,
Sand (including purchased), clay, mortar, concrete waste, and any of the above can be used in any combination.

[0015]

In the underground burial method for a pipeline having the above-described structure, the excavated soil is pressurized and blocked, so that its strength is increased and the density, water resistance, water shielding and the like are also improved.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Figure 1 is a pipe according to the present invention
1 shows an embodiment of an underground burial method. In the underground burial work of a pipeline, first, as shown in FIG. 1A, the road surface pavement 12 is cut, and the subgrade 14 is excavated almost vertically to a predetermined depth to form a concave excavation hole 16. The excavated residual soil generated at this time is transported to a block manufacturing plant 18 installed adjacent to the construction site, where it is pressurized and formed into a block 20.

At the time of this pressure molding, clay and a binder are added and mixed as necessary, as described above. Then, in this embodiment, first, a plurality of blocks 20 are installed at the bottom of the drilling hole 16 (below the pipe to be laid). Next, the tube 10 is placed on the block 20, and in the space around the tube 10,
A number of blocks 20 are arranged on the side of the tube 10 and above the tube 10.
Are loaded vertically and horizontally, and the borehole 16 is backfilled. At this time, a plugging material such as mortar is filled between the blocks 20 as needed. When the block 20 is loaded in the excavation hole 16, the road surface pavement 12 is applied again, and the construction is completed as shown in FIG.

[0019]

As described above in detail with the embodiments of the present invention, according to the underground pipe burying method according to the present invention, excavated residual soil, incinerated ash, bentonite, kaolin The block is press-molded by mixing with clay, etc., and the surrounding area of the pipe is backfilled with the obtained block, so that it can be applied to various types of excavated soil, and the block has sufficient strength, density, water resistance, and water shielding. Because of the high quality, the quality is stable, the transportation efficiency and stocking are excellent, and the utilization rate of excavated soil is high. In addition, since the block has a higher initial strength than the slurry, it is suitable for pipeline construction, requires no curing time or rolling pressure, and can suppress damage and deformation of the pipe, The construction period can be significantly reduced. Furthermore, when performing re-digging, it is only necessary to take out the blocks, and the taken-out blocks can be reused .

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an embodiment of a method of burying a pipe underground according to the present invention in the order of steps.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Pipe 12 Road surface pavement 14 Subgrade 16 Drilling hole 18 Block manufacturing plant 20 Block

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E02F 7/00 F16L 1/024 F16L 1/038

Claims (3)

(57) [Claims] (1) excavating ground surrounding a planned pipeline, excavated soil, extinguished ash and bentonite produced by excavation;
The block is mixed with clay such as kaolin to form a block under pressure, and the obtained block is placed at the bottom of a borehole.
The conduit is placed on the click, the block around the conduit
Underground burial method of pipeline characterized by loading . Wherein said block is underground construction method of the conduit according to claim 1, characterized in that the mixture to pressure molding the binder to the excavated residual soil. 3. The pipeline according to claim 1, wherein the blocks are stacked vertically and horizontally at the excavation point, and a filling material such as mortar is filled between the blocks.
Underground burial method.