JP2010043157A - Heavyweight material for construction groundwork and method for supplying the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make use of heavyweight concrete containing baryte, to reduce disposal cost in disposal of a balance weight for construction equipment discarded, to recycle the discharged waste material, and to provide a heavyweight material suitable for construction groundwork. <P>SOLUTION: The heavyweight material for construction groundwork comprises debris of heavyweight concrete containing baryte. Debris of waste heavyweight concrete recovered from a balance weight for construction equipment discarded can be used, the bulk specific gravity of the debris is regulated to ≥2.0, and the debris can be utilized as a heavyweight banking material, etc. The material for construction groundwork can be used to prevent an underwater structure or an underground structure from rising. When such a heavyweight material for construction groundwork is supplied, a mixture of debris of various waste heavyweight concretes containing baryte recovered from balance weights for various construction equipments discarded is subjected to quality regulation as usage under uniform management so as to obtain a material of stable quality fit for its use and purpose, and this material is supplied. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a heavy material for civil engineering foundations made of crushed heavy concrete containing barite and a method for supplying the same, and in particular, waste containing barite used for various construction machine counterweights to be discarded. The present invention relates to a heavy-duty material for civil engineering foundations that effectively uses heavy-duty concrete and a method for supplying the heavy-weight material.

  Counterweights are used in various construction machines such as excavators and crane cars (hereinafter referred to as “construction machines” as appropriate) in order to prevent overturning by balancing the construction machines during operation. There are two types of counterweights, a casting type and a can-making type. The can-making type is an iron plate on the outside, and the inside is filled with heavy concrete having a unit volume weight larger than that of ordinary concrete.

  The statutory useful life of construction machinery is 11 years, and the number of construction machinery dismantled in Japan exceeds 6,000 units per year. However, with the disposal of construction machinery, about 8,000 tons of counterweight is disposed of every year. ing. Casting type counterweights can be processed by existing casting crushers and have achieved a recycling rate exceeding 80%. On the other hand, the can-making type crushes heavy concrete filled inside, but uses iron-based material as heavy aggregate, and heavy concrete has high strength. And a special processing system is also required, so the recycling rate is just over 20%.

  By the way, in soft ground, etc., it is necessary to prevent underground structures from lifting due to the lifting pressure from groundwater or earthquakes. Therefore, conventionally, there have been measures to prevent lifting by ingots, heavy concrete, anchor methods, etc. Has been proposed. For example, in Patent Document 1, in order to economically prevent the underground structure from lifting and reduce the groundwater uplift pressure acting on the underground structure, a bottom expansion portion is formed at the lower portion of the underground structure, There is described a method for preventing the underground structure from being lifted by placing an overload above the weight obtained by subtracting the weight of the underground structure from the pumping pressure acting on the underground structure at the expanded bottom.

  When replacing existing pipes such as sewage pipes or installing new pipes, a large amount of residual soil is generated by drilling. If this residual soil is backfilled in the drilling section, a large amount of clay is present. Because of this, the stability of the soil around the subsurface facilities is degraded, and the subsurface facilities cannot be reliably protected, so improved soil is used. As this improved soil, for example, Patent Document 2 proposes an improved soil prepared by mixing and stirring earth and sand and crushed recycled concrete to clay in the excavated residual soil.

  In addition to the above-mentioned soil (lifting prevention material) and improved soil (backfill material), waste materials such as concrete waste materials include earth foundation materials, roadbed materials, caisson inserts, and landfills for civil engineering foundation materials. It is used as a stabilizer and sandbag filling material.

Japanese Patent Laid-Open No. 06-158671 JP 2001-11844 A

  As mentioned above, heavy concrete is used for canning type counterweights of construction machinery, but iron ore of magnetite and hematite that has been used so far as heavy aggregate constituting heavy concrete, Due to the recent increase in prices due to brisk steel demand, and the strength of the aggregate itself, the recycled aggregate manufacturing equipment can be used to collect and recycle aggregates and reuse them as heavy aggregates. Progressing. However, those containing pyrite such as pyrite steel are concerned about the elution of harmful substances such as sulfuric acid. On the other hand, barite is known as one of heavy aggregates, but has not been sufficiently put into practical use due to some difficulties in terms of strength, quality stability, supply, etc. (FIG. 1). Indicates that the strength varies depending on the particle size of barite).

  On the other hand, it is conceivable to use heavy concrete crushed material as the above-mentioned civil engineering foundation material, but iron-based heavy concrete crushed material is used only for the collection and utilization of iron ore, and the concrete part is utilized. Not. Further, those containing pyrite, such as pyrite steel, have a risk of elution of harmful substances such as sulfuric acid. Therefore, there has been no heavy material for civil engineering foundations that is made of crushed heavy concrete and is inexpensive and easy to use.

  Therefore, the present invention has been made in view of the problems in the conventional technology described above, and is intended to utilize heavy concrete containing barite and to reduce the processing cost of construction equipment counterweight to be discarded. At the same time, the purpose is to provide a heavy material suitable for civil engineering foundation by recycling heavy concrete waste material of construction equipment counterweight.

  In order to solve the above problems, the present inventors focused on the characteristics of barite and the characteristics of heavy concrete using barite as a heavy aggregate, the market price, etc. It came to make this invention. That is, the present invention is a heavy-duty material for civil engineering foundations, and is characterized by comprising a heavy concrete crushed material containing barite.

  The reason why concrete containing barite is used is as follows. Since barite is less expensive than iron ore, the production cost of heavy concrete can be reduced by using barite as the heavy aggregate. In addition, since barite is low in strength (see Fig. 1), heavy concrete using barite can be easily crushed and does not require a large amount of energy for crushing. The processing cost can be reduced. In addition to these, crushed materials can be used as heavy-weight materials for civil engineering foundations as they are after adjusting the particle size without sorting them into aggregates and cement paste. In addition, barite is a harmless and safe mineral that can be applied underwater or underground because there is no concern about water pollution or soil pollution, providing heavy materials for civil engineering foundations with stable quality. (As shown in FIG. 1 and Table 2, the quality is not stable when barite is used as a simple substance, but the quality is stabilized by using a crushed concrete).

  The "heavy material for civil engineering foundation" as used in the present invention is used for civil engineering foundations such as lifting prevention materials, backfilling materials, embankment materials, filling materials, landfill ground stabilization materials, sandbag filling materials, etc. The bulk specific gravity is 2.0 or more. As above-mentioned, this granule lump consists of a crushed material of heavy concrete containing barite. Although the particle size of a powder lump is not specifically limited, Preferably it is the maximum particle size of 40 mm or less.

  In the above-mentioned heavy material for civil engineering foundation, it is preferable that the crushed material is a crushed material of waste weight concrete recovered from a construction machine counterweight to be discarded. Thereby, the processing cost of the construction machine counterweight to be discarded can be reduced, the waste material to be discharged can be recycled, and heavy materials for civil engineering foundations can be provided at low cost.

  Further, in the above heavy material for civil engineering foundation, the crushed material may be adjusted to have a bulk specific gravity of 2.0 or more, preferably 2.2 or more. Thereby, the quality of a crushed material is stabilized more and it can utilize for a heavy embankment material etc. The specific gravity is adjusted by the volume capacity or the like.

  Furthermore, the crushed material can be used for preventing the floating of the underwater structure or the underground structure. Barite has a large specific gravity of about 4.0 to 4.3, so if crushed heavy concrete containing barite is used to prevent the floating of underwater structures, etc., it is more effective than using ordinary earth and sand. Can be functional. An example of an underwater structure is a sinking box. Examples of underground structures include pipelines and manholes.

  Further, the present invention is a method for supplying heavy materials for civil engineering foundations composed of the above-mentioned heavy concrete crushed material, and crushing various waste heavy concrete containing barite collected from various construction machine counterweights to be discarded In order to make the mixture of materials a stable quality material that meets the purpose of the application, it is characterized by being supplied after adjusting the quality for each application under a centralized management.

  Various waste heavy concrete crushed materials containing barite recovered from various construction machinery counterweights include various types of barite stones of various quality, strength, specific gravity, particle size, etc. Because there are various uses of heavy materials for use as described above, providing quality materials that are consistent with the purpose of use by supplying the products after adjusting the quality for each use under unified management. Is possible.

  As described above, according to the present invention, it is possible to utilize heavy concrete containing barite, and in particular, when the concrete is used in a construction machine counterweight, its processing cost At the same time, it is possible to recycle the discharged concrete waste material and provide a heavy material suitable for civil engineering foundations.

  As described above, the present invention is a heavy-duty material for civil engineering foundations, and is characterized by comprising a heavy concrete crushed material containing barite. Barite is a mineral crystallized from barium sulfate, and its English name is called Barite. Mainly produced in China and the United States, the specific gravity is about 4.0 to 4.3, and the crystal structure is brittle as shown in the graph of FIG. However, when heavy concrete is manufactured using barite as a heavy aggregate (formulation is shown in Table 1), as shown in Table 2, conventional concrete, conventional DSM (molten slag) and iron oxide powder are used. Although its strength is slightly lower than that of heavy concrete, it has strength that can be used as heavy concrete.

  The crushed material refers to a material obtained by crushing the above heavy concrete with a crusher such as a jaw crusher. The particle size of the crushed material is not particularly limited, but a single particle size (a state where the particle size distribution is sharp and the pulverized material having a specific particle size is unevenly distributed) is not preferable because the mass per volume is reduced, and a wider particle size distribution is preferable. Aggregates with small particles enter the voids between the materials and are closely packed. As a result, the mass per unit volume is increased, and performance as a civil engineering material for the purpose of weight increase is preferable. Specifically, a crushed material having a maximum particle size of 40 mm or less and a particle size of 10 to 25% by mass with a particle size of 0.4 to 8 mm is preferable.

  The present invention utilizes the property that the strength of heavy concrete using barite is slightly lower than that of conventional heavy concrete using iron ore, and produces heavy concrete using barite, Used for industrial products that do not require particularly high strength (such as counterweights for construction machinery), and when the industrial products are discarded after several to several decades, they are crushed and used as heavy materials for civil engineering foundations. By planning to use it, it is possible not only to reduce the manufacturing cost and processing cost of the industrial products by using relatively inexpensive barite, but also to supply inexpensive heavy materials for civil engineering foundations. It can also contribute to the improvement of the recycling rate of the industrial product. The barite alone has a low strength and the strength varies depending on the particle size, so it is difficult to use, but these problems can be solved by using a crushed concrete. In addition, it is difficult to recover barite from heavy concrete containing barite, but in the present invention, it is not necessary to recover the barite, so that it is highly practical.

  In the manufacture of heavy concrete using barite, barite is used as a heavy aggregate, and in addition to barite, cement, water, admixture (material) are used, and the blending ratio is 30 compared with water cement. Heavy concrete is produced at about 80% (see Table 1). Examples of characteristics of the manufactured heavy concrete are as shown in Table 2.

  In order to produce a construction machine counterweight using this heavy concrete, a heavy concrete is filled into a cylindrical container formed of an iron plate or the like, as in the prior art. Since heavy concrete in a construction machine counterweight is not required to have high strength, it does not have to be as strong as heavy concrete using iron ore as a heavy aggregate. If heavy concrete containing barite is used, it can be easily crushed during the disposal of construction equipment counterweights, and the energy required for crushing can be greatly reduced. It is preferable because a crushed product in which the cement paste and the cement paste are integrated can be obtained, and the crushed product can be used as a civil engineering foundation material simply by adjusting the particle size. When barite is used as a basic material for civil engineering foundations, it is not preferable in terms of variation in strength. However, if crushed material in which barite is covered with cement paste is used, relatively stable and sufficient strength can be obtained. Since it is obtained, it is preferable. In addition, although it is difficult to recover barite from concrete containing barite, it is not necessary in the present invention, and is highly practical.

  The above-mentioned heavy concrete crushed material using barite can be used for various heavy materials for civil engineering foundations. For example, overlay soil (lifting prevention material), improved soil, embankment material, roadbed material, caisson It can be used for filling materials, ground stabilization materials for landfills, filling materials for sandbags, etc. Of these, some examples of use will be described later.

  Of the civil engineering foundation materials, the embankment material is a material used for laying and building up on a low ground or slope during development of residential land or road maintenance. Simply embedding on soft ground is likely to cause land subsidence in the future, so rolling and ground improvement work are often performed together. The use of heavy materials made of the crushed material of the present invention is preferable in terms of promoting the use of land because the settlement time for ground improvement is shortened and stabilized at an early stage.

  The roadbed material is a material used for road ground and the like, and is classified into an upper layer roadbed material and a lower layer roadbed material. Each of these roadbed materials has a standard defined by JIS. The use of heavy materials made of the crushed material of the present invention is preferable because it has compaction properties equivalent to those of recycled roadbed materials.

  The caisson filling material refers to a material filled in an underwater structure such as a breakwater or a steel large box-shaped caisson used to construct an underground structure. It is preferable to use a heavy material made of the crushed material of the present invention because a mass necessary for stabilization can be easily obtained.

  The land stabilization material for landfills is a material for stabilizing soft ground such as landfills, and is intended to prevent the floating of structures with low specific gravity (such as sewer pipes). is there.

  The sandbag filling material is a material used to produce a sandbag by filling in a cloth bag, and is usually filled with sand and sand. When a heavy material made of the crushed material of the present invention is used, a high mass can be easily obtained, which makes it possible to stabilize the sandbag installation location.

  The crushed material of heavy concrete containing barite according to the present invention can be used for each civil engineering foundation exemplified above as a heavy material. In particular, the underground structure as shown in Patent Document 1 is used. It is more preferable to use it as an overlying soil for preventing the lifting of the material, and since it is a heavy material, when used as the overlying soil, the amount used per volume can be reduced. In addition to the underground structure described in Patent Document 1, for the same purpose, a building constructed in a landfill, a building built in a site where the building was removed, an underground pipe, and an assembly installed in the ground It can be suitably used to prevent floating of underground structures such as manholes and underwater structures. Note that no special machinery or equipment is required for filling, laying, rolling, compacting, etc. of heavy materials according to the present invention, and construction can be performed in the same manner as in general civil engineering work.

  Next, a method for producing heavy materials for civil engineering foundations of the present invention from construction machine counterweights to be discarded will be described.

  First, the counterweight is removed from the construction machine at the processing place where the construction machine (construction machine) such as a power shovel to be discarded is placed. This counterweight is a steel can filled with heavy concrete containing barite. Next, the steel plate is peeled off from the steel can using Labandi, and the heavy concrete is crushed by a crusher such as a crusher. Although the degree of crushing is not particularly limited, it is usually crushed to a particle size of a concrete aggregate or roadbed material.

  Next, some examples of utilization of heavy materials made of the crushed material according to the present invention to a civil engineering foundation will be described with reference to the drawings.

(1) Material for preventing floating of underground structure FIG. 2 is a schematic view showing a case where the heavy material according to the present invention is used for preventing the lifting of a manhole as an example of the underground structure. This manhole 1 is an assembly type used for sewers etc., for example, Comprising: The bottom part is equipped with the collar part 1a. Although the manhole 1 exists in the ground, there is a possibility that the groundwater level may rise or the surrounding ground 3 may be lifted if it is soft. Therefore, the heavy material 2 according to the present invention is stacked from the upper part of the flange 1a of the manhole 1 to the vicinity of the ground surface to prevent the manhole 1 from being lifted. In FIG. 2, only a part of the heavy material 2 stacked around the manhole 1 is shown. The heavy material 2 is actually disposed over the entire circumference of the manhole 1. In the construction, a space is formed to install the manhole 1 in the ground 3, the manhole 1 is placed in the space, and then the heavy material 2 is stacked in the space around the manhole 1. . The particle size of the crushed material according to the present invention is not particularly limited. Although the heavy material 2 may be used as a simple substance, it is used by mixing with a binder such as excavated earth and sand, various fillers, and cement as necessary.

(2) Lifting prevention material of underwater structure FIG. 3 shows the case where the heavy material according to the present invention is used for preventing the lifting of a submerged box as an underwater structure. The submerged box 11 is, for example, a box-shaped concrete block connected in a tunnel shape. For example, a vehicle such as an automobile travels in an internal space. The submerged box 11 exists in the sea, a lake, a canal, and the like, and is located on the surface of the ground 13. However, since the water 14 exists above, there is a possibility that the box 11 may be lifted by buoyancy. Therefore, the heavy material 12 according to the present invention is placed above the submerged box 11 to prevent the submerged box 11 from being lifted. In the construction, after placing the submerged box 11 on the ground 13, the heavy material 12 is laid on the submerged box 11. When laying, it is preferable to take measures such as placing the heavy material 12 to be placed in a bag so that the heavy material 12 is not dissipated by running water or the like, or fixing it with a binding material. Alternatively, it may be embanked to the surface of the sea and left to settle until it settles down. The particle size of the crushed material according to the present invention is not particularly limited. In addition to the submerged box 11, the heavy materials according to the present invention can be used in the same way for a pier, a balancer of a drilling structure for a subsea oil field, a subsea gas field, or the like.

(3) Embankment Material FIG. 4 shows a case where the heavy material according to the present invention is used for the embankment material. In old rivers, swamps, and wetlands, the ground is soft, so it is not possible to build buildings in that state. Therefore, by placing the heavy material 22 according to the present invention above the soft ground 21, the soft ground 21 is drained, the unstable soft state is eliminated at an early stage, and the building is made stable. Build. Conventionally, light-weight embankment materials are often used so that settlement and wall side pressure do not increase. However, in the present invention, the problem of soft ground is solved by subsidizing and stabilizing the ground early. That is, the conditions for applying this material as a banking material are places where it is not necessary to consider the side pressure on the walls, for example, places where there are no dredging walls in the surrounding area, etc. However, it can be suitably used for land of the opposite nature to the place where earth pressure reduction is desirable. The particle size of the crushed material according to the present invention is approximately the same as the crushed material of general concrete conventionally used for embankment materials.

(4) Roadbed Material FIG. 5 shows a case where the heavy material according to the present invention is used for the roadbed material. For example, when the gas pipe 31, the culvert 32, and the sewage pipe 33 are laid on the ground 36 by the propulsion method, since the backfilling is not performed, it is not possible to take a lift prevention measure that can be performed at the time of backfilling. Therefore, if the groundwater level 37 rises or the surrounding ground 36 is soft, the gas pipe 31 or the like may be lifted. Therefore, the heavy material 34 according to the present invention is laid as a heavy roadbed material above the gas pipe 31 and the like to prevent the gas pipe 31 and the like from being lifted. The crushed material of heavy concrete used is used in accordance with various standards for conventional roadbed materials. A conventional surface layer roadbed material 35 is separately laid above the heavy material 34.

(5) Insertion material FIG. 6 shows a case where the heavy material according to the present invention is used as an insertion material of caisson. The caisson 41 is a large steel box that is used when constructing an underwater structure such as a breakwater or an underground structure. Usually, the caisson 41 has a hollow inside and remains as it is. It stands in the sea 43. Therefore, the heavy material 44 according to the present invention is filled in the cavity of the caisson 41, and the caisson 41 itself can be stabilized by weighting or lowering the center of gravity. Further, when the caisson 41 is fixed to the ground 42 with an anchor or the like, the stabilization of the caisson 41 leads to a reduction in anchor work. The particle size and strength of the heavy concrete crushed material of the present invention used as the heavy material 44 are not particularly limited, but it is preferable that the specific gravity has a small variation. The crushed material is used as it is by filling the hollow portion so that the filling rate is substantially equal. In addition, in the case of the caisson used for a quay, after filling with a filling material to near the upper surface, it is covered with concrete (ordinary concrete). On the other hand, in the case of breakwater caisson, there is a wave-dissipating one, and in this case, the filling material is filled only up to several meters from the sea surface, and after filling the filling material, a concrete cover is made, This part is a facility for wave eradication.

  Next, a method of supplying heavy materials for civil engineering foundations (hereinafter referred to as “heavy materials”) according to the present invention will be described with reference to the drawings.

  FIG. 7 shows an example of manufacturing a heavy material according to the present invention by separating and crushing waste heavy concrete containing barite from a waste construction machine at a disposal site of various waste construction machines.

  The disposal construction machine processing sites 51 are scattered throughout the country to manufacture heavy materials from various discarded construction machines. The waste construction machine processing place 51 includes various waste construction machine places 52 for storing the received waste construction equipment, and a decomposition processing place 53 for disassembling the received waste construction equipment and separating and disassembling the waste counterweight and the like from the construction equipment. , A processing site 54 for processing machine parts, etc., for processing the separated waste counterweight, an office 55, a test chamber 56, and the like.

  The processing site 54 for machine parts, etc. is a crushing processing plant equipped with a decomposition processing site 54a for decomposing the waste counterweight separated in the decomposition processing plant 53 into iron plates and concrete, and a crushing device for crushing the separated concrete. 54b, a quality adjusting facility 54c equipped with a sieving device for adjusting the particle size of the crushed concrete and a mixing device, a crushed material storage site 54d for storing crushed material that is adjusted in particle size and shipped as a heavy material, A waste storage site 54e for storing waste such as powder parts which are generated as a result of crushing and quality adjustment and are not shipped as heavy materials is provided. The test chamber 56 is provided with various test devices for measuring the particle size, specific gravity, and the like of the crushed material.

  The waste construction machine received in the waste construction machine processing place 51 is temporarily stored in various waste construction machine place 52, disassembled in the decomposition processing place 53, and the waste counterweight and the like are separated and decomposed, and the processing place 54 for machine parts and the like. Transport to.

  Next, the separated waste counterweight is decomposed into an iron plate and concrete at the decomposition treatment site 54a of the treatment plant 54 for machine parts, etc., and the separated concrete is crushed at the crushing treatment plant 54b and crushed by the quality adjustment equipment 54c. Adjust the particle size of concrete. In some cases, the crushed materials are mixed by the quality adjusting equipment 54c. The crushed material is tested in the test chamber 56, and the crushed material that can be shipped is temporarily stored in the crushed material storage place 54d to prepare for shipment. On the other hand, the waste generated by crushing concrete is stored in the waste storage place 54e and disposed of.

  Figure 8 shows a collection of crushed and lump of waste heavy concrete containing barite obtained from various waste construction machines (hereinafter referred to as “crushed material”) in one place (Heavy Materials Center). Then, an example in the case of obtaining heavy materials of the present invention by mixing and quality adjustment for each application will be shown.

  The heavy material center 61 is arranged in one place or several places throughout Japan, and is roughly divided into a receiving / stock yard 61a that accepts various crushed materials from the treatment plants 51A to 51D of various waste construction machines, and a crushed variety of accepted varieties. A stock yard 61b for storing items, a quality adjustment facility 61c for the crushed material received, a shipping yard 61d for shipping the crushed material after quality adjustment as a heavy material, a test chamber 61e for testing the crushed material, It consists of an office (control room) 61f that manages the entire heavy material center 61.

  The receiving / stock yard 61a is provided to receive various crushed materials from the processing sites 51A to 51D of a plurality of various waste construction machines, and includes a hopper, a crushed material transporter, and the like.

  The stock yard 61b has a scale capable of storing a large quantity of crushed materials of various types received in the receiving / stock yard 61a, and temporarily stores the received crushed materials in different places according to quality and the like. Provided.

  The quality adjustment facility 61c is a facility for adjusting the quality of the crushed material stored in the stock yard 61b to obtain heavy materials, and includes a mixer, a crusher, a sieve, a specific gravity sorter, a classifier, and the like.

  The test room 61e is provided for testing the quality and the like of heavy materials whose quality has been adjusted at the quality adjustment facility 61c, and is provided with various test devices for measuring strength, specific gravity, particle size, moisture, and the like.

  The shipping yard 61d ships the crushed material (heavy material) stored in the stock yard 61b as it is according to the order from the user, or ships the heavy material whose quality is adjusted in the quality adjustment facility 61c as described above. For this purpose, a shipping facility having equipment and devices necessary for shipping is provided.

  Next, an operation example of the heavy material center 61 will be described with reference to FIG.

  When the crushed material manufactured at the treatment plants 51A to 51D of various waste construction machines can be directly provided to the user as a heavy material, the crushed material is shipped directly to the user from each of the treatment plants 51A to 51D. Other crushed materials are transported to the heavy material center 61 and received at the receiving / stock yard 61a of the heavy material center 61.

  The crushed materials produced at the treatment plants 51A to 51D of various waste construction machines are crushed various waste heavy concrete containing barite recovered from various construction machine counterweights. , Various qualities in terms of strength, specific gravity, particle size, and the like. Therefore, each crushed material received in the receiving / stock yard 61a of the heavy material center 61 is stored in the stock yard 61b in different places according to the quality of each crushed material.

  When the heavy material center 61 receives an order from a customer, if the crushed material stored in the stock yard 61b can be used as it is as a heavy material, the crushed material is directly transferred to the shipping yard 61d and used as it is as a heavy material. If this is not possible, quality adjustment is performed at the quality adjustment facility 61c. As described above, since there are various uses of heavy materials, it is necessary to adjust the quality according to the uses of heavy materials. For example, when used as a caisson filling material, the bulk specific gravity is 2.0 or more (unit volume underwater mass 2.3 or more), and when used as a manhole lift prevention material, the bulk specific gravity is 2.0 or more. It is necessary to do. In addition, when used for embankment, it is necessary to have quality defined in JIS (A5032, A5023, etc.) of roadbed materials.

  The crushed material that has undergone quality adjustment in the quality adjustment facility 61c is measured in the test room 61e for specific gravity, strength, and the like. The product is shipped from the shipping yard 61d to the user as various heavy materials.

  As described above, various waste heavy concrete crushed materials including barite recovered from various construction machine counterweights include various quality materials, and therefore, at the treatment plants 51A to 51D of various waste construction machines. The manufactured crushed material has various qualities, and there are various uses of heavy materials. However, the heavy material center 61 performs management for each application under centralized management. We can always provide consistent and stable quality materials.

It is a graph which shows the split tensile strength, such as barite. It is a use figure as a floating prevention material to the underground structure (manhole) of the heavy-duty material for civil engineering foundations concerning this invention. It is a use figure as a floating prevention material to the underwater structure (submerged box) of the heavy material for civil engineering foundation concerning this invention. It is a use figure as a banking material of the heavy-duty material for civil engineering foundations concerning this invention. It is a use figure as a roadbed material of the heavy-duty material for civil engineering foundations concerning this invention. It is a usage figure as a caisson insertion material of the heavy-duty material for civil engineering foundations concerning this invention. It is the schematic which shows an example of the disposal construction machine processing place for enforcing the supply method of the heavy material for civil engineering foundation concerning this invention. It is a flowchart which shows the process in the heavy material center for enforcing the supply method of the heavy material for civil engineering foundation concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Manhole 1a Saddle 2 Heavy material 3 Ground 11 Submerged box 12 Heavy material 13 Ground 14 Water 21 Soft ground 22 Heavy material 23 Ground 31 Gas pipe 32 Underdrain 33 Sewage pipe 34 Weight material 35 Surface layer base material 36 Ground 37 Groundwater level 41 Caisson 42 Ground 43 Sea 44 Heavy material 51 (51A to 51D) Waste construction machine processing place 52 Various waste construction machine place 53 Decomposition place 54 Processing place 54a for machine parts etc. Decomposition place 54b Crushing place 54c Quality adjustment equipment 54d Crushed material place Place 54e Waste storage place 55 Office 56 Test room 61 Heavy material center 61a Reception / stock yard 61b Stock yard 61c Quality adjustment facility 61d Shipment yard 61e Test room 61f Office room (control room)

Claims (5)

  Heavy material for civil engineering foundations, characterized by consisting of crushed heavy concrete containing barite.   The heavy material for a civil engineering foundation according to claim 1, wherein the crushed material is a crushed material of waste heavy concrete recovered from a construction machine counterweight.   The heavy material for a civil engineering foundation according to claim 1 or 2, wherein the crushed material has a bulk specific gravity adjusted to 2.0 or more.   The heavy-duty material for civil engineering foundation according to claim 1, 2 or 3, wherein the civil engineering foundation material is a material used for preventing the floating of an underwater structure or underground structure.   The method for supplying heavy materials for civil engineering foundations according to claim 2, wherein a mixture of various waste heavy concrete crushed materials including barite collected from various construction machine counterweights to be discarded is matched to the purpose of use. A heavy-weight material supply method for civil engineering foundations, which is supplied after adjusting the quality for each application under centralized management in order to make the material stable and stable.

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