JP3665833B2 - Refilling method for buried trench - Google Patents

Description

[0001]
[Industrial technical field]
The present invention relates to a burying method for burying water and sewage pipes and various cables, and more particularly to a burying method for burying a buried groove that is buried using residual soil that is industrial waste generated from a construction site.
[0002]
[Prior art]
Most of the residual soil generated at the civil engineering construction site is disposed of, but the disposal of construction residual soil has become a serious social problem because of the shortage of disposal sites.
As one solution to this problem, attempts have been made to make this type of residual soil into a slurry and use it for reclamation of grooves.
Specifically, the remaining soil and solidified material (such as cement) are mixed with water to make a slurry, and these slurries (hereinafter referred to as “fluidized soil”) are used as a groove backfill material. is there.
[0003]
[Problems to be solved by the invention]
The method of using fluidized soil as a backfill material has the following points to be improved.
<I> Since fluidized soil has an extremely high moisture content, it causes buoyancy in buried objects such as pipes.
Therefore, it is necessary to take a countermeasure against the buoyancy of the buried object separately, and there is no suitable buoyancy countermeasure at present.
<B> Since the fluidized soil has low viscosity, it is necessary to prevent the fluidized soil from flowing out by forming a sandbag or weir in the middle of the groove, and it takes a lot of work to form the soilbag or weir.
<C> Most fluidized soil is water and the amount of earth and sand used is small. Therefore, the reuse rate of the remaining soil is low.
[0004]
The present invention has been made in view of the above points. The purpose of the present invention is to make effective use of the remaining soil, and it is necessary to take special measures for measures for buoyancy of buried objects and measures for preventing outflow of fluidized soil. It is to provide a technology for backfilling buried trenches.
[0005]
[Means for solving problems]
The present invention relates to a method for burying a buried groove in which buried material is laid back in a buried groove and then backfilled with a backfill material. The embankment body is constructed by placing it in a slurry, and the slurry-like low-viscosity fluidized soil mainly composed of residual soil is filled in the embedding groove defined by the embankment body as a backfill material. This is a method for backfilling buried trenches.
Furthermore, the present invention relates to a method for burying a buried groove that is buried in a buried groove and then backfilled with a filling material, a step of cutting the buried groove, a step of laying the buried object in the buried groove, and a residual soil. A slurry-like high-viscosity fluidized soil, mainly composed of A buried groove filling-up method characterized by repeating a step of filling a buried groove defined by a bank body as a filling material.
Furthermore, the present invention is a buried groove filling-up method characterized in that the highly viscous fluidized soil is a kneaded product of mud and solidified material whose specific gravity is adjusted to the residual soil.
Furthermore, the present invention is a buried groove filling-up method characterized in that the low-viscosity fluidized soil is a kneaded product of mud and solidified material whose specific gravity is adjusted to the residual soil.
[0006]
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0007]
<I> Fluidized soil First, in the present invention, fluidized soil having different viscosities is used as (1) backfill material, (2) as a dam that regulates the outflow of fluidized soil, and (3) buoyancy resistance of buried objects. Use as material.
The fluidized soil is a slurry-like material obtained by kneading mud with a uniform specific gravity and soil to be treated such as residual soil generated at the construction site, or a solidifying material such as cement is added to these and kneaded. It means a solidified slurry.
[0008]
<B>"Muddysubstance" that is a component of fluidized soil of muddy substance is muddy water containing clay, silt, bentonite and other mud and water as a blending element, and the specific gravity of these mixtures is uniformly adjusted. means. The specific gravity of the mud is adjusted by the mixing ratio of mud and water.
In other words, the treated soil generated on site also serves as a compound for fluidized soil as well as a muddy compound. Specifically, it was recovered in an uncured state in addition to the remaining soil generated at the construction site. Includes old muddy water.
The creation of mud and fluidized soil is disclosed in Japanese Patent Application Laid-Open No. 5-182108 filed earlier by the present inventor and will not be described here.
[0009]
[Action]
Next, a method for burying an embedded object using the fluidized soil will be described.
[0010]
<I> Groove excavation and laying of buried objects (Figure 2)
The buried groove 1 is cut by a known excavator, and a buried object 3 such as a fume pipe is laid on the sand 2 formed at the bottom of the buried groove 1.
When laying the buried object 3, a sufficient water stop work is applied to the connecting portion with the end of the buried object 3 a previously buried.
[0011]
<B> Dyke body construction (Figs. 2 and 3)
When the laying of the buried object 3 is completed, the levee body 4 is constructed on the side of the digging progress direction of the buried groove 1. The levee body 4 is constructed by dividing the fluidized soil described above with high viscosity (low-specific gravity fluidized soil) into several layers or by continuously placing them in a mountain shape. The fluidized soil used for the construction of the levee body 4 is constructed by a spraying method or a formwork method, and at least has a viscosity sufficient to be self-supported immediately after placing.
The cast fluidized soil covers the outer periphery near the end of the buried object 3 and is placed in close contact with the unevenness of the wall surface of the buried groove 1 to finally define the buried groove 1 into two. .
As the fluidized soil constituting the dam body 4, for example, the specific gravity of the mud is about 1.05 to 1.10, the mixing ratio of the mud is about 0.2, and the flow value is 80 to 120 mm. Things can be used.
In addition, the code | symbol 2a of the drawing right side of FIG. 2 is the hardening bank body constructed | assembled by the last span.
[0012]
<C> Backfill (Figure 1)
When the construction of the levee body 4 is completed, low-viscosity (high specific gravity) fluidized soil is filled as the backfill material 5 in the buried groove 1 defined by the dam bodies 4, 4 a.
The backfill material 5 is prevented from flowing out by the dam body 4 defining the buried groove 1, and filled in every corner of the buried groove 1 to gradually increase the liquid level.
As the liquid level of the backfill material 5 increases, the upward buoyancy F generated in the buried object 3 also gradually increases.
This buoyancy F is canceled by the downward weights W, W of the respective levee bodies 4, 4 a placed at both ends of the buried object 3, thereby preventing the buried object 3 from rising.
That is, the bank body 4 not only functions as a weir that prevents the backfill material 5 from flowing out, but also functions as a buoyancy counter member for the buried object 3.
As the fluidized soil 5 constituting the backfill material 5, for example, the specific gravity of the mud is in the range of 1.05 to 1.15, the mixing ratio of the mud is 0.2 to 0.4, and the flow A value of 100 to 140 mm can be used.
Similarly, the buried object 3 is buried while repeating the excavation process of the buried groove 1, the laying process of the buried object 3, the construction process of the dam body 4, and the backfilling process.
In addition, it is necessary to select the appropriate specific gravity for the fluidized soil to be actually used depending on the nature of the generated soil at the construction site.
[0013]
Second Embodiment of the Invention
FIG. 4 shows another embodiment in which the bank body 4 and the backfill material 5 are constructed hierarchically.
The construction method will be described. For example, after the first divided dam body 4b is constructed, the first backfill material 5b is filled up to the height of the first divided dam body 4b, and then the second portion is placed on the top of the first divided dam body 4b. After adding the division bank body 4c, the 2nd backfill material 5c is filled into the upper part of the 1st backfill material 5b. Similarly, the dam body 4 and the backfill material 5 are constructed in several stages so that the third divided dam body 4d is additionally installed at the top of the second divided dam body 4b.
[0014]
【The invention's effect】
The present invention can obtain the following effects.
<I> It can be effectively used as a backfill material by fluidizing the construction residual soil, which has been problematic in the past.
<B> The embankment body and backfilling material can be constructed using the same kind of fluidized soil, only with different specific gravity.
<C> Since the levee body and the backfill material are the same type of fluidized soil, they are compatible with each other, and high integrity can be secured after construction.
<D> The levee body not only functions as a cut-off material for the backfill material, but also functions as a weight member that opposes the buoyancy generated in the buried object, and does not require a separate buoyancy countermeasure for the buried object. <E> Since the backfill material uses fluidized soil with low viscosity, it can be filled up to every corner of the buried groove, and good backfilling without generating voids inside is possible.
[Brief description of the drawings]
[Fig. 1] Explanatory view of filling backfill material [Fig. 2] Explanatory view of building process of levee body [Fig. 3] Cross sectional view of dam body location [Figure 4] Hierarchical backfilling Example 2 Illustration [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Burrowing groove 2 ... Laying sand 3 ... Buried object 4 ... Dam body (viscous fluidized soil)
5 ... Backfill (fluidized soil with low viscosity)

Claims (4)

After burying the buried object in the buried groove, backfilling the buried groove backfilled with backfill material,
A levee body was constructed by placing slurry-like highly viscous fluidized soil mainly composed of residual soil into a part of the buried groove,
A slurry-like low-viscosity fluidized soil mainly composed of residual soil is filled as a backfill material in a buried groove defined by the bank body,
A method for backfilling buried trenches. After burying the buried object in the buried groove, backfilling the buried groove backfilled with backfill material,
A process of excavating the buried groove;
Laying buried objects in the buried grooves;
A step of constructing a dam body by placing slurry-like highly viscous fluidized soil mainly composed of residual soil into a part of the buried groove;
And repeating the step of filling slurry-like low-viscosity fluidized treated soil mainly composed of residual soil as a backfill material in the buried groove defined by the levee body,
A method for backfilling buried trenches. The buried groove filling method according to claim 1 or 2, wherein the highly viscous fluidized soil is a kneaded product of mud and solidified material whose specific gravity is adjusted to the residual soil. 3. The buried groove filling method according to claim 1 or 2, wherein the low-viscosity fluidized soil is a kneaded product of mud and solidified material whose specific gravity is adjusted to the residual soil.

Images