JPH08254284A - Colored soil for recognizing buried structure - Google Patents

Abstract

PURPOSE: To recognize existence of a buried structure safely without taking much labor or time by coloring with pigment, all or a part of backfilled earth(s) which is (are) used when various kinds of buried structure buried or built under an earth surface are backfilled. CONSTITUTION: Backfilled earth is formed as a treatment earth which is formed by mixing water and hardening-agent with sediment and/or the improved earth thereof, it includes foaming agent or foaming agent, and it is a colored earth having a color difference of 3.0 or more or 6.0 or more compared with present positioned earth. Pigment is not limited in either case of an inorganic system and an organic system, but an inorganic pigment is used as the pigment. The inorganic pigment has good alkali resistance, light resistance, weather resistance, and heat resistance. There is no browning of hue in the inorganic pigment. The color of the inorganic pigment is preferably to be an auxiliary color or a near color comparing with the present positioned earth. Colored earths 15 for recognizing buried structure are arranged on all upper surface parts positioned around a gas pipe 1 as the buried structure, upper surface parts, and both side surface parts, a roadbed 7 and a subgrade 9 are arranged thereon, and then road pavement 11 is carried out thereon. It is thus possible to obtain colored earth for recognizing the buried structure easily, recognize the buried structure by a constructor easily, and also carry out work safely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a colored soil for recognizing a buried object used for backfilling a buried object such as a gas pipe or a communication cable underground.

[0002]

2. Description of the Related Art Various kinds of buried objects such as gas pipes, water pipes, communication cables, etc. that are buried or constructed under the surface of roads or other ground surfaces are dug up and backfilled many times for the purpose of repair and maintenance. . Further, since the buried objects such as the gas pipes are linearly present on a plane, it is very difficult to display the existence of such buried objects in all places on the ground.

Therefore, it is difficult to know exactly where these buried objects are buried, and accidentally damage the gas pipe and cause an accident during excavation work, for example, work for digging up and repairing a water pipe. The case that it ends up does not follow.

In order to prevent such an accident, as shown in FIG. 3, the gas pipe 1 is provided on the upper surface immediately above the buried object such as the gas pipe 1.
The display tape 3 indicating the existence of the gas is arranged, and the protective plate 5 for preventing the damage of the gas pipe 1 is arranged. For example, in the case of city gas, medium pressure (internal pressure 1 kgf
/ Cm ² or more and less than 10 kgf / cm ² ) and low pressure (internal pressure less than 1 kgf / cm ² ) the display tape 3 is arranged.

Here, the display tape 3 is, for example, a green polyethylene sheet having a thickness of 0.15 mm and a width of about 400 mm. Further, the protective plate 5 has, for example, a thickness of 6 to 1
It is an iron plate having a width of 2 mm and a width of 600 to 1000 mm. At high pressure (internal pressure of 10 kgf / cm ² or more), the arrangement of the display tape 3 and the protective plate 5 is specified. In the figure, 7 is a roadbed, 9 is a roadbed, and 11 is a road pavement.

[0006]

However, the placement of the display tape 3 and the protective plate 5 requires the placement work by an operator in the excavated groove 13 and the placement work by a heavy machine. Further, since beams are installed everywhere in the excavated trench, the protection plate 5 and the like must be arranged avoiding these beams, which is time-consuming, time-consuming, and dangerous.

Further, when the display tape 3 and the protective plate 5 are already arranged, a worker who works at the time of re-digging discovers the display tape 3 and the protective plate 5 and bury them below them. Excavation will be carried out while paying attention to the buried objects such as the gas pipe 1. However, after the display tape 3 and the protective plate 5 are once removed, nothing remains to call attention to the presence of the buried object.

Therefore, the present invention has been made to solve the above problems, and does not require the labor and time for disposing the display tape and the protective plate as in the conventional case.
The purpose of the present invention is to provide a colored soil for recognizing a buried object, which is safe and easy to recognize the existence of the buried object.

Although no conventional colored soil has been proposed for the purpose of recognizing the presence of a buried object, a colored soil has been proposed in a field different from the present invention. For example, JP-A-58-58
The "colored zeolite" disclosed in 190819 is used for remodeling of golf course greens and for soils, etc. However, since zeolite is a tuffaceous material, if the particle size is small, it will be affected by the rainfall, and Since the wet disintegration of the grass is accelerated, particles may flow near the roots of the lawn, which may impair the air flow.

Therefore, the mined ore containing the zeolite as the main component is roughly crushed and classified, the impurities are removed and dried, and the obtained dried product is sieved to a desired particle size by a sifter and sized. The manufacturing process is extremely complicated.

[0012] The "crushed particles using the residue of gravel washing" disclosed in Japanese Patent Laid-Open No. 3-27215 is used for horticultural soil mixed with a ground coat material, an oil and fat adsorbent, and a fertilizer. In order to obtain the appropriate particle size and strength,
This also requires complicated steps such as dewatering the gravel washing residue under pressure, forcibly mixing it with a soil stabilizer, drying and solidifying, and further adjusting the particle size.

The "colored shirasu particles" disclosed in JP-A-4-278024 are used for turf growth, lawn debots and the like.
After drying at a temperature of 0-800 ℃, remove the granules of 0.2 mm or less, the particle size (0.2
.About.0.6 mm and 0.6 to 2 mm), and further sieving the solidified portion by the synthetic resin (by 0.6 mm and 2 mm sieve).

As described above, the conventional colored soil requires a complicated manufacturing process depending on its purpose, and many processing steps are required to impart characteristics other than coloring, and therefore, it is used for the purpose of the present invention. To do so would be costly and completely unsuitable. Therefore, the present invention provides a colored soil for recognizing a buried object, which is inexpensive and can be easily manufactured.

[0014]

[Means for Solving the Problems]

(1) The invention of claim 1 is obtained by coloring all or part of backfill soil used for backfilling various buried objects buried or constructed below the ground surface with a pigment. Provided is a colored soil for recognizing a buried object, which is characterized by:

(2) According to the invention of claim 2, the backfill soil is treated soil in which water and / or solidified material is mixed with soil and / or improved soil thereof, and the buried object recognition according to claim 1 is characterized. Provide colored soil for use.

(3) In the invention of claim 3, the treated soil is
The colored soil for recognizing a buried object according to claim 2, which is an aerated treated soil containing a foaming agent or a foaming agent.

(4) The invention according to claim 4 is characterized in that the buried object recognizing colored soil is a colored soil having a color difference of 3.0 or more with respect to the current position soil. There is provided a colored soil for recognizing a buried object according to any one of 1.

(5) The invention according to claim 5 is characterized in that the colored soil for recognizing a buried object is a colored soil having a color difference of 6.0 or more with respect to the soil at the present position. The colored soil for recognizing a buried object according to any one of 1.

[0019]

[Action]

Various buried objects which are buried or constructed under the surface of the road such as the present invention include gas pipes, water pipes,
Communication cables and various other types are possible. Also,
The term "embedded object" includes any material that may be accidentally damaged when it is excavated again or when another adjacent object is excavated.

The term "underground" as used herein is generally under a road, but is not limited to this and includes all places where buried objects may exist. In addition, the backfill soil mentioned here includes the following cases. (1) Earth and sand and improved soil thereof, or a mixture thereof, (2) The earth and sand and the improved soil may be lightweight earth and sand containing a lightweight material such as expanded polystyrene. (3) It may be a treated soil obtained by mixing the soil and / or the improved soil of (1) and (2) with water and a solidifying material.

(4) The treated soil of (3) above may be an aerated treated soil having bubbles due to a foaming agent or a foaming agent. The earth and sand may be soil generated when excavating a groove for burying or soil brought in from a place other than the excavation site. The improved soil refers to soil and sand stabilized by, for example, lime.

Among the backfilled soils, the treated soil is most preferable as the target soil used for the colored soil. The treated soil has the following advantages. (1) Since the treated soil already contains a solidifying material, it can also serve as a fixing for the color pigment. (2) By mixing the pigments at the same time in the mixing step of the treated soil manufacturing step, new equipment and steps for coloring are not required. (3) Since the treated soil is mixed with water, a pigmented soil for recognizing an embedded object can be manufactured inexpensively, easily, and with good quality because the pigment is easily dispersed uniformly in a short time. it can.

Also, when the improved soil and the lightweight soil are used as the target soil for the colored soil, a step of producing an improved soil by mixing an improved material with the soil, and a lightweight material for the soil and the improved soil By mixing the pigments in the step of mixing and producing the lightweight earth and sand, new equipment and steps for coloring are not required.

The above-mentioned foaming agent is a material which, when mixed in the slurry, produces a gas by a chemical reaction, such as a metal aluminum powder which produces hydrogen by a reaction with an alkali. Further, the foaming agent is one that physically introduces bubbles by a surface active action, and refers to, for example, a surface active agent such as a synthetic surface active agent, a resin soap type and a hydrolyzed protein type.

Pigments include organic pigments and inorganic pigments. Organic pigments are superior in coloring property to inorganic pigments, but are inferior in alkali resistance, weather resistance, light resistance and heat resistance. From these reasons, it is desirable to use the inorganic pigment, but from the viewpoint of cost, the organic pigment is cheaper and advantageous.

Further, it is preferable to use uniform pigment particles and those which prevent primary aggregation and secondary aggregation. This makes it possible to prevent blurring and change in hue, enhance colorability, dispersibility, hiding power, etc., and improve color developability. The mixing amount of the pigment to be mixed with the backfilled soil is determined by the color of the backfilled soil, the color of the existing soil around the buried object, and the type of pigment.

The above-mentioned pigments are not limited to inorganic and organic pigments, but are preferably excellent in alkali resistance, light resistance, weather resistance, heat resistance, etc., and are resistant to alkali, light, weather, heat, etc. Inorganic pigments that show as little color fading as possible are preferable.

The pigment is selected by comprehensively judging the following conditions. (1) It is necessary to obtain a color difference that can be distinguished from the current position soil. That is, the color difference at which it is possible to identify the presence of the colored soil for recognizing a buried object in the soil at the current position is 1.5 or more, and the color difference that makes the colored soil for a buried object recognition conspicuous is 3.0 or more. The color difference is 6.0 or more, and the color difference is 12.0 or more.

(2) The color of the backfilled soil is
It is desirable to have a complementary color or a relationship close to that of the existing soil. (3) The color can be predetermined depending on the type of the buried object. For example, green is used when the buried object is a gas pipe, blue is used when the buried object is a water pipe, and red is used when the buried object is a communication cable such as a telephone line.

It is also possible to use a binder to ensure coloring. That is, when soil is colored with, for example, an inorganic pigment by stirring with a mixer or the like, the pigment is not fixed to the soil without the binder.

However, when the backfill position is shallower than the groundwater level or when the pigment particles are smaller than the earth and sand, the pigment rarely leaves the soil particles in the normal backfilling state. However, it is possible that the pigment may flow out if there is running water. Therefore, it is necessary to fix the pigment with the binder.

As the binder, cement or a cement-based, lime-based, slag-based solidifying material is easily available,
It is relatively inexpensive and it is possible to reliably fix the pigment in the backfill soil. Other binders include acrylic acid ester-based, cyanoacrylate-based, epoxy-based,
Nitrile resins and the like are considered.

As a method of mixing the binder, there may be considered a case where only the binder is mixed with the backfill soil and a case where the binder and water are mixed together with the backfill soil. This mixing amount is determined by the type and amount of pigment, the type of backfill soil, the required color difference, and the strength required for the finished colored soil.

It is also possible to perform firing in a simple furnace without using a binder. Alternatively, a pigment-dissolved liquid may be added by spraying to reduce the water content by drying for coloring.

[0036]

EXAMPLES Examples of the present invention will be described below. (Example 1) The pigment used in Example 1 was an inorganic pigment, and an inorganic pigment manufactured by Bayer was used. As the backfill soil, treated soil of Kanto loam (natural water content ratio 85%) was used. The color of the pigment was red, and Biferrox 130M (iron oxide type) was used.

Since the treated soil was used as the backfill soil, no binder was used. The mixing amount of pigment is shown in Table 1.
As shown in, various changes were made. The colored soil for recognizing a buried object was manufactured by adding and mixing a pigment to the final step (stirring / mixing step of a mixer of soil, water, and solidifying material) of the process for manufacturing treated soil.

Then, as items to be examined in the experimental results, (1) coloring property of whether or not coloring is successful (2) fading property of whether fading of hue occurs (3) sufficient fluidity as a treatment degree (4) Backfill soil has four items of strength, that is, whether or not the backfilled soil satisfies the upper limit of strength that enables re-excavation.

As a result of the experiment, (1) the pigment mixing amount was ³ to 10 kg / m ³ (2) the cement amount was 150 kg / m ³ (3) the water mixing amount was 400 kg / m ³ , the coloring property was A color difference of 3.0 or more is ensured for each backfill soil before coloring, fading does not fade in the ground below the groundwater level, and fluidity is 200 mm or more immediately after manufacturing (Road Public Corporation formula (Cylinder flow test) and coloring for recognizing buried objects that can suppress the final strength (uniaxial compressive strength) of backfilled soil to about 3.0 kgf / cm ² or less that can be easily re-excavated with a scoop. Soil could be produced.

(Example 2) The same pigment as in Example 1 was used, and as the backfill soil, a treated soil of sand (natural water content ratio 6%) was used. The pigment is green and chromium oxide green GM
(Chromium oxide type) was adopted. Further, since the treated soil was used as the backfill soil, no binder was used. The amount of pigment mixed was variously changed (Table 1). The colored soil for recognizing buried objects is manufactured by the final process (sand, sand,
The pigment was added and mixed in a stirring and mixing step of mixing the water and the solidifying material with a mixer).

As the items to be examined for the experimental results, (1) coloring property of whether or not coloring is successful (2) fading property of whether fading of hue occurs (3) sufficient fluidity as a treatment degree (4) Backfill soil has four items of strength, that is, whether or not the backfilled soil satisfies the upper limit of strength that enables re-excavation.

As a result of the experiment, (1) the pigment mixing amount is ³ to 20 kg / m ³ (2) the cement amount is 60 kg / m ³ (3) the water mixing amount is 300 kg / m ³ (4) the cohesive soil is used as sand By adjusting the weight ratio to be 10%, a color difference of 3.0 or more could be secured with respect to the backfill soil before coloring.

Further, the fading property does not cause fading in the ground below the groundwater level, and the flowability is 200 m immediately after the production.
Secure at least m (road public corporation type cylinder flow test),
Further, it was possible to manufacture a colored soil for recognizing buried objects, which can suppress the final strength (uniaxial compressive strength) of backfilled soil to approximately 3.0 kgf / cm ² or less, which can be easily re-excavated with a scoop or the like. .

(Example 3) The same pigment as in Example 1 was used, and improved soil of Kanto Loam was used as backfill soil. The color of the pigment was green, and chromium oxide green GM (chromium oxide type) was adopted. No binder was used because the position of backfill soil was shallower than the groundwater level. The amount of pigment mixed was variously changed (Table 1). The colored soil for recognizing buried objects was manufactured by adding and mixing pigments in the lime mixing step in the improved soil manufacturing step.

As the items to be examined for the experimental results, there are two items: (1) coloring property of whether coloring is successful or not (2) fading property of whether fading of hue occurs.

As a result of the experiment, the amount of pigment mixed was 3 to 20 kg /
With m ^3, to ensure color difference of 10 or more with the subgrade material (sand), also it was not observed discoloration. In addition, although the example which mixed a pigment in the manufacturing process of improved soil was shown in this application, it is also possible to mix pigment with improved soil and manufacture the colored soil for buried object recognition.

Example 4 The same pigment as in Example 1 was used, and sandy soil (generated soil) was used as backfill soil. The color of the pigment is yellow and Bayferrox 920 (iron oxide type)
It was adopted. No binder was used because the position of backfill soil was shallower than the groundwater level. The amount of pigment mixed was variously changed (Table 1). The colored soil for recognizing buried objects was manufactured by mixing with a mixer at the backfill site.

As the items to be examined for the experimental results, there are two items: (1) coloring property of whether coloring is successful or not (2) fading property of whether fading of hue occurs. As a result of the experiment, the pigment mixture amount is 3 to 20k.
By setting g / m ³ , a color difference of 10 or more with the soil at the current position (the sandy soil) was secured, and no fading was observed.

(Example 5) The same pigment as in Example 1 was used, and lightweight sand of sandy soil was used as backfill soil.
The color of the pigment was red, and Biferrox 130M (iron oxide type) was used. Moreover, since the backfill position was shallower than the groundwater level, no binder was used.

The amount of pigment mixed was variously changed (Table 1). The colored soil for recognizing buried objects was manufactured by adding and mixing pigments in the lightweight material mixing step in the lightweight earth and sand manufacturing process. Then, as the items to be examined for the experimental results, there are two items: (1) coloring property of whether coloring is successful or not (2) fading property of whether fading of hue occurs.

As a result of the experiment, the pigment mixture amount was 1 to 10 kg /
With m ^3, to ensure color difference of 10 or more with the subgrade material (sand), also it was not observed discoloration. In addition, although the example which mixed a pigment in the manufacturing process of lightweight earth and sand was shown in this application, it is also possible to manufacture pigmented soil for buried object recognition by mixing a pigment with lightweight earth and sand.

(Example 6) The same pigment as in Example 1 was used, and the foamed treated soil of Kanto Loam was used. The color of the pigment was red, and Biferrox 130M (chromium oxide type) was used. Further, since the foamed treated soil was used as the backfill soil, no binder was used.

The amount of pigment mixed was variously changed (Table 1). The colored soil for recognizing buried objects was manufactured by adding and mixing pigments in the mixing step of the soil, the solidifying material, the water, and the foam material in the manufacturing process of the foamed treated soil.

[0054]

[Table 1]

Then, as the examination items of the experimental results, (1) coloring property of whether or not coloring is successful (2) fading property of whether fading of hue occurs (3) sufficient fluidity as a treatment degree (4) Backfill soil has four items of strength, that is, whether or not the backfilled soil satisfies the upper limit of strength that enables re-excavation.

As a result of the experiment, (1) the amount of pigment mixed is ³ to 10 kg / m ³ (2) the amount of solidifying material is 100 kg / m ³ (3) the amount of water mixed is 400 kg / m ³ (4) the amount of bubbles is 230 L By setting it to be / m ³ , a color difference of 3.0 or more can be secured with respect to the backfilled soil before coloring.

Further, the fading property does not cause fading in the ground below the groundwater level, the fluidity can be pumped, and the P funnel flow time immediately after production is 15 seconds or less. It was possible to manufacture a colored soil for recognizing buried objects, the strength (uniaxial compressive strength) of which can be easily re-drilled with a scoop or the like to be suppressed to about 3.0 kgf / cm ² or less. In addition, although the example which mixes a pigment in the manufacturing process of an aerated processing soil was shown in this application, it is also possible to mix a pigment with an aerated processing soil and manufacture the colored soil for buried object recognition.

A method of actually burying an embedded object using the above-described colored soil for recognizing an embedded object will be described below with reference to FIGS. 1 and 2. In FIG. 1 and FIG. 2, the buried object is the gas pipe 1. Further, the underground where the burial is performed is under the pavement 11 of the road.

In FIG. 1, colored soil 15 for recognizing an embedded object is arranged on all of the upper surface portion, the lower surface portion, and both side surface portions located around the gas pipe 1 which is an embedded material. A roadbed 7 and a roadbed 9 are present above the buried object recognizing colored soil 15, and a pavement 11 for the road is provided thereon.

By arranging the colored soil 15 for recognizing the buried object not only on the upper surface of the gas pipe 1 but also on both side surfaces thereof in this way, even when re-excavation is performed from the side of the gas pipe 1, the work can be performed. The member can immediately notice the presence of the gas pipe and prevent the gas pipe from being damaged.

That is, the excavation is also performed on other buried objects. For example, when excavating a water pipe or a communication cable (not shown) adjacent to the gas pipe 1, the excavation is performed from the side of the gas pipe 1. It may happen. Even in such a case, since the buried object recognizing colored soil 15 appears during the excavation work, the fact that the gas pipe 1 is buried is immediately recognized and the attention is called. Therefore, the gas pipe 1 is not inadvertently damaged.

Further, as shown in FIG. 2, the gas pipe 1 which is a buried object.
The colored soil 15 for recognizing the buried object is arranged only on the upper surface around the road, and the roadbed 7 made of treated soil is provided around most of the gas pipe 1.
It is also possible to arrange. In this way, since the buried object recognizing colored soil 15 only needs to be arranged on the upper surface of the gas pipe 1, the amount of the buried object recognizing colored soil 15 used can be saved.

As described above, according to these embodiments, the buried object is backfilled by using the buried object recognizing colored soil having a color difference of 3.0 or more, preferably 6.0 or more, from the soil at the present position. , It becomes possible to recognize the existence of the buried object at the time of re-excavation and easily call the attention.

That is, since the color difference between the backfill soil and the soil at the present position is 3.0 or more, preferably 6.0 or more, the soil at the present position and the backfill soil can be easily identified during excavation work. When such backfilled soil appears, it can be easily recognized that the buried object exists below or on the side of the soil.

Further, compared to the case where the display tape 3 and the protection plate 5 are arranged as in the conventional case, the labor and time for the arrangement are not required. In other words, by performing backfilling using the buried object recognizing colored soil 15, it is possible to leave a mark sufficient to immediately recognize the buried object and call attention.

[0066]

INDUSTRIAL APPLICABILITY According to the present invention, as a backfill soil used for backfilling various buried objects buried or constructed under the surface of the earth, coloring obtained by coloring all or part of it with a pigment By using the soil, the colored soil for recognizing a buried object can be easily obtained (Claim 1). Further, the treated soil can be used as the backfill soil, which facilitates the backfill work (claims 2 and 3). The colored soil for recognizing buried objects
By using colored soil having a color difference of 3.0 or more or 6.0 or more with respect to the current location soil, the operator can easily recognize the buried object and safe construction is possible (claim 4,
5).

[Brief description of drawings]

FIG. 1 is a diagram showing a burying method using the buried object recognizing colored soil of the present invention.

FIG. 2 is a diagram showing another embodiment of the present invention.

FIG. 3 is a diagram showing a structure for protecting a conventional underground buried object.

[Explanation of symbols]

 1 Gas pipe (buried object) 3 Display tape 5 Protective plate 7 Roadbed 9 Roadbed 11 Pavement 15 Colored soil for recognizing buried object

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomorou Suzuki 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Pipe Co., Ltd.

Claims (5)

[Claims] 1. A burial characterized by being obtained by coloring all or part of backfill soil used for backfilling various buried objects buried or constructed below the ground surface with a pigment. Colored soil for object recognition. 2. The buried soil recognizing colored soil according to claim 1, wherein the backfill soil is a treated soil in which water and / or a solidifying material is mixed with soil and / or improved soil thereof. 3. The buried soil recognizing colored soil according to claim 2, wherein the treated soil is a foamed treated soil containing a foaming agent or a foaming agent. 4. The buried object according to claim 1, wherein the buried object recognizing colored soil is a colored soil having a color difference of 3.0 or more with respect to the current position soil. Colored soil for recognition. 5. The buried object according to claim 1, wherein the buried object recognizing colored soil is a colored soil having a color difference of 6.0 or more with respect to the current position soil. Colored soil for recognition.