JP2911412B2 - Filling material for construction work, method of manufacturing the same, and method of filling construction site using the filler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filler for construction work, and more particularly to a filler for construction work suitable as a filler for construction work and a backfill material for excavation work.

[0002]

2. Description of the Related Art In construction work such as subway work and cable burial work, it is necessary to backfill an excavated portion after the work is completed. Conventionally, in this backfilling work, construction surplus soil generally generated during excavation work has been used as backfilling material. Backfilling work using construction surplus soil is performed by using heavy equipment such as dump trucks in a wide area where heavy equipment can enter. Moreover, in a narrow place where these heavy machines cannot enter, the construction is carried out by manually transporting the residual soil.

[0003] When the backfilling work is performed using a heavy machine such as a dump truck, there are inconveniences such as generating a loud noise or generating a large amount of dust. Further, when the backfilling work is performed manually, disadvantages such as a longer construction period and an increase in cost are caused. In this regard, the surplus construction soil was not always the best backfill material for construction work.

[0004] The above-mentioned drawbacks associated with the use of construction backfill as backfill material can be solved, for example, by providing the backfill material with appropriate fluidity. That is, if the backfill material has appropriate fluidity, the backfill material can be transported by pressure feeding. By transporting the backfill material by pressure, it is possible to prevent the generation of loud noise and a large amount of dust, and to transport the backfill material even in a narrow work space without human intervention. Becomes possible.

[0005] Conventionally, as a backfill material having fluidity, for example, a man-made soil (trade name) handled by TIC Corporation has been known. Man-made soil is a material prepared by adding cement or water to construction surplus soil to exhibit appropriate fluidity.
Therefore, according to the backfilling operation using the man-made soil, while suppressing the generation amount of noise and dust,
Also, backfilling work can be performed under excellent workability regardless of the size of the work space.

[0006]

However, the above-mentioned conventional backfill material, that is, a man-made soil, uses construction residual soil as an aggregate. Therefore, in the process of preparing a man-made soil, it is necessary to supply construction residual soil as a material to a plant for preparation.

[0007] Surplus soil contains various substances different from sand and gravel used as aggregate for concrete. Therefore, it is not possible to share a plant facility for preparing man-made soil with a plant facility for preparing concrete. In this respect, the man-made soil has a disadvantage that it cannot be easily manufactured in a general concrete plant.

[0008] In addition, the construction residual soil used by the man-made soil as an aggregate sometimes contains coarse-grained sand. If coarse sand is contained in the backfill material produced by adding cement, water, etc. to the construction surplus soil, after the backfill material is filled at the excavation site, In addition, due to the difference in specific gravity, coarse-grained sand may be separated from other components. Such separation of the components causes sedimentation in the backfilled portion.
In this respect, the man-made soil has a possibility of generating large settlement depending on the quality of the construction surplus soil used.

[0009] Meanwhile, concrete used for construction work is generally prepared in a concrete plant and then transported to a construction site by an agitator truck (mixer truck). After discharging concrete at the construction site, cement, sand, gravel, and the like remaining in the luggage compartment of the agitator car are washed away in a dedicated car wash. The wastewater generated during car washing contains sludge water containing cement components, sand, and gravel.

[0010] Sand and gravel contained in the wastewater can be reused as a raw material for concrete by classifying according to the particle size. On the other hand, sludge water contained in wastewater has been conventionally treated as non-reusable industrial waste. That is, when concrete is handled by the conventional method, it is necessary to treat the sludge water as industrial waste.

The present invention has been made in view of the above points, and can be easily manufactured in a general concrete plant using sludge water as a raw material, and can easily maintain stable quality. A first object is to provide a filler for construction work.

A second object of the present invention is to provide a method for producing the above-mentioned filler for construction work, and further provide a method for filling a construction site using the above-mentioned filler for construction work. This is the third object.

[0013]

A first object of the present invention is to reduce the number of curing days in a range from 7 days to 28 days.
The cement weighed at a predetermined weight ratio, the sand weighed at a predetermined weight ratio, and the washing wastewater of the concrete handling equipment are subjected to sand, gravel, and sludge so that the compressive strength at the time of passing is 10 kgf / cm ² or less. separating the water, the sludge water obtained by concentrating such a solids concentration of 20 to 30 wt%, construction containing a concentrated sludge water which is metered in a predetermined weight ratio Achievable with fillers.

In the present invention, when cement, sand and concentrated sludge water are prepared at a predetermined mixing ratio, a filler material which exhibits appropriate fluidity during filling operation and thereafter exhibits appropriate strength is realized. . In the present invention, sand whose particle size is easy to control is used for the aggregate. For this reason, the quality of the filler can be stably maintained by a simple method. Further, the components of cement, sand, and concentrated sludge water are all components contained in ordinary concrete. For this reason, the filler for construction work according to the present invention can be manufactured in a general concrete plant.

A second object of the present invention is to produce a filler for construction work having a compressive strength of 10 kgf / cm ² or less after a hardening period in the range of 7 days to 28 days. A method of separating washing wastewater from concrete handling equipment into sand and gravel, and sludge water, and a step of separating the sludge water separated in the sludge water separation step into a solid content of 20 to 30% by weight. A method for producing a filler for construction work, comprising: a sludge water concentration step of concentrating concentrated sludge water; and a kneading step of kneading a predetermined amount of the concentrated sludge water, a predetermined amount of cement, and a predetermined amount of sand. Is achieved by

In the present invention, the sludge water separation step comprises:
It is a process that is always performed when handling concrete. When the sludge water separated from the washing wastewater is concentrated to a predetermined concentration, the weight of the solid components contained in the sludge water can be easily controlled, and the tank for storing the sludge water can be made smaller. Further, the kneading of the concentrated sludge water, the cement and the sand can be carried out using a plant for kneading ordinary concrete as it is. Therefore,
According to the above method, in a normal concrete plant,
A filler having stable quality can be easily manufactured.

A third object of the present invention is to weigh the sample at a predetermined weight ratio so that the compressive strength at the time when the curing time in the range of 7 days to 28 days has passed is 10 kgf / cm ² or less. The obtained cement, sand weighed at a predetermined weight ratio, and sludge water generated during washing of concrete handling equipment are concentrated to a solid concentration of 20 to 30% by weight. The filler for construction work containing the concentrated sludge water measured by weight ratio, a filler preparation step of loading the storage vehicle, a filling site to be filled with the filler for construction work, and the storage vehicle A filling method for a construction work filler, comprising: a pipe laying step of laying a pipe therebetween; and a filler supply step of supplying the construction work filler from the storage vehicle to the filling site via the pipe. Achieved by .

In the present invention, the filler used for the filling work exhibits appropriate fluidity during the work. For this reason,
If a pipe is laid from the storage vehicle loaded with the filler to the filling site, the filler can be easily transported from the storage vehicle to the filling site by a method such as pressure feeding. According to such a method, generation of noise and dust is suppressed, and high workability is realized.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram for explaining an example of a use form of a filler according to an embodiment of the present invention. FIG. 1 shows a state in which a building 14 has been constructed at a position slightly away from the slope 12 of the mountain 10.

When the building 14 is constructed at a position slightly away from the slope 12 of the mountain 10 as shown in FIG. 1, it is necessary to prevent earth and sand sliding down the slope from reaching the building 14. . For this reason, in the present embodiment, the retaining wall 16 is provided between the slope 12 and the building 14, and the slope 12 and the retaining wall 1 are provided.
6, a filler 18 is filled.

In the present embodiment, a filler obtained by kneading a predetermined weight ratio of cement, a predetermined weight ratio of sand, and a predetermined weight ratio of concentrated sludge water is used as the filler 18. I have. The mixing ratio of cement, sand, and concentrated sludge water is, specifically, 75 kg, 1446 kg, and 400 liters per m ^3, respectively.

In this embodiment, since the filler 18 does not need to be hardened quickly, ordinary cement is used as "cement" for convenience in handling.
The cement that can be used as a raw material for the filler 18 is not limited to ordinary cement, but includes blast furnace cement,
Alternatively, an early-strength cement can be used.

In this embodiment, the cleaning sand that has been subjected to the cleaning step is used as "sand". The sand that can be used as a raw material of the filler 18 is not limited to the cleaning sand,
Mountain sand or river sand can also be used. “Concentrated sludge water” used as a raw material of the filler 18 is:
The sludge water obtained by removing sand and gravel from the wastewater generated when cleaning the equipment used for handling concrete, in particular, the luggage compartment of the agitator truck (mixer truck) used for transporting concrete, is subjected to an appropriate method. It is a liquid substance concentrated to a concentration. Therefore, the concentrated sludge water contains solids contained in concrete (specifically, cement, fine sand, limestone powder, and dirt of sand and gravel used as aggregate for concrete) and water. include. The concentrated sludge water used in this example is prepared so that the weight ratio of the solid content is 20 to 30%. In addition, the method of controlling the concentration of the concentrated sludge water can be controlled not only by the weight of the solid content but also by the specific gravity.

The filler 18 having the above-mentioned distribution ratio shows appropriate fluidity during the filling operation. If the filler 18 does not show fluidity, it is necessary to transport the filler 18 between the slope 12 and the retaining wall 16 by using a heavy machine such as a dump truck or manually. On the other hand, if the filler 18 exhibits fluidity as in the present embodiment, the filler 18 can be fluidly transported between the slope 12 and the retaining wall 16.

FIG. 1 shows that the filling material 18 is provided on the slope 12 and the retaining wall 1.
6 shows an example in which pumping is performed by the pump truck 20 up to the interval between the pressure and the pressure. The construction method shown in FIG.
Is stopped at an appropriate position near the building 14, a pipe 22 is laid from the discharge port of the pump car 20 to between the slope 12 and the retaining wall 16, and then the pump of the pump car 20 is operated. Can be realized.

The filler 18 that has flowed from the pipe 22 between the slope 12 and the retaining wall 16 owes to its own fluidity to fill the space where the filler 18 is to be filled from the place where the filler 18 is driven. Spread slowly. Therefore, according to the method of the present embodiment, an excellent filling rate can be realized without using compaction equipment such as a vibrator. For this reason, according to the method of the present embodiment, the filler 18 is formed between the slope 12 and the retaining wall 16 with high working efficiency without generating a loud noise and generating a large amount of dust. Can be filled.

In the above-mentioned construction method, the "filling material preparing step" according to claim 3 is performed by storing the filling material 18 in a pump truck 20 by laying the pipe 22 in a desired state. The “pipe laying step” according to item 3 is performed by using the filling material 18 between the slope 12 and the retaining wall 16 from the pump truck 20
The "filling material supply step" according to the third aspect is realized by pressure feeding.

Next, a second example of the usage of the filler 18 of this embodiment will be described with reference to FIG. FIG. 2 shows a side view of the excavated portion 30 of the subway construction. In FIG. 2, a subway vehicle 32, 3
4, bulkhead 36, water and wastewater piping 38, and cable 4
0 is represented.

When the excavated portion 30 is provided in the course of subway construction, it is necessary to refill the excavated portion 30 after necessary work is completed. In such a case, the filler 18 of the present embodiment can be used as a backfill material for filling the excavated portion 30. As described above, the filler 18 has appropriate fluidity during operation. Therefore, the filler 18
Can be transported using an agitator wheel as in the case of concrete.

FIG. 2 shows that the filler 18 is conveyed by the agitator wheel 42 to a position immediately adjacent to the excavated portion 30 and the agitator wheel 4.
2 shows a method of supplying the filler 18 into the inside of the excavated portion 30 through the outflow channel 44 provided in the excavating part 30. In the construction method shown in FIG. 2, the agitator wheel 42 storing the filler 18 is stopped at a position immediately adjacent to the excavated portion 30, the outflow path 44 of the agitator wheel 44 is adjusted to an appropriate state, and then the agitator wheel 18 18 can be realized.

According to this construction method, the excavated portion 30 can be backfilled with high working efficiency without generating large noise and generating a large amount of dust. In the above-mentioned method, the "filling material preparation step" of the third aspect is performed by storing the filler 18 in the agitator wheel 42, and the outflow path 44 is adjusted to a desired state. The “pipe laying step” described above is realized, and the “filling material supply step” according to claim 3 is realized by causing the filler 18 to flow out of the agitator wheel 42.

Next, a third example of the usage of the filler 18 of the present embodiment will be described with reference to FIG. FIG. 3 is a diagram illustrating a side view of an excavated portion 50 of a foundation portion of a building.
In FIG. 3, inside the excavated portion 50, a steel frame 52 constituting the foundation of the building is shown. 3, the same components as those shown in FIG. 2 are denoted by the same reference numerals, and the description thereof will be omitted or simplified.

Excavation part 50 in foundation work of building construction
When the required work is completed, the excavated part 50
Need to be backfilled. In such a case, the filler 18 of the present embodiment can be used as a backfill material to be filled in the excavated portion 50. As described above, the filler 18 can be conveyed using an agitator wheel, similarly to concrete. FIG. 3 shows that the filler 18 is conveyed by the agitator wheel 42 to a position immediately adjacent to the excavated portion 50.
The filling material 18 is removed from the excavated portion 5
0 shows the method of supply inside. According to the construction method shown in FIG. 3, as in the case of the construction method shown in FIG. 2, the digging portion 50 can be buried with high working efficiency without generating a loud noise and without generating a large amount of dust. Can be reverted.

In the above method, the "filling material preparing step" according to the third aspect of the present invention is performed by adjusting the outflow path 44 to a desired state by storing the filling material 18 in the agitator wheel 42. The "pipe laying step" according to the third aspect and the "filling material supply step" according to the third aspect are realized by causing the filler 18 to flow out of the agitator wheel 42, respectively.

Next, with reference to FIG. 4, a fourth example of the usage of the filler 18 of this embodiment will be described. FIG. 4 is a plan view showing a foundation work portion of a detached house in a plan view. 4, the same components as those shown in FIG. 2 or 3 are denoted by the same reference numerals, and the description thereof will be omitted or simplified.

As shown in FIG. 4, a concrete wall 60 corresponding to the layout of each room is provided at the base of a detached house. The concrete wall 60 usually has a ground clearance of about 30 cm. The ground surface 62 surrounded by the concrete wall 60 is usually covered with concrete or the like in order to prevent moisture from reaching the floor of the house. In such a case, the filler 18 of this embodiment can be used as a covering material instead of concrete.

When the ground surface 62 is covered with the filler 18, the filler 18 is conveyed to the vicinity of the construction site by the agitator wheel 42, and the outflow path 4 of the agitator wheel 42 is provided.
4 and the filling material 18 is transferred to the ground surface 6 through a pipe 64.
It can be realized by supplying it to the upper part of 2. According to the above construction method, the ground surface 62 can be produced with high working efficiency without generating a loud noise and without generating a large amount of dust.
Can be coated.

In the above method, the filling material 18 is stored in the agitator wheel 42 so that the "filling material preparing step" of the third aspect adjusts the outflow path 44 and the pipe 64 to a desired state. Thus, the “pipe laying step” according to the third aspect is realized, and the “filling material supply step” according to the third aspect is realized by causing the filler 18 to flow out of the agitator wheel 42.

By the way, the filling material to be filled between the retaining wall and the slope and the backfill material used for backfilling the excavated portion are required to have appropriate fluidity, as well as a breathing rate and compressive strength. Appropriate values are required. The breathing rate is a ratio of the height H at the end of the filling operation of the filler (or the backfilling material) and the decrease width ΔH in the height direction generated in the process of curing the filler, that is, (ΔH
/ H) * 100. If the bleeding rate is high, large sedimentation occurs on the surface of the filler (or backfill material) during the curing process. For this reason, the smaller the breathing rate of the filler or the backfill material, the better.

In the initial stage of hardening of the filler (or backfill material), aggregates and cement particles having a high specific gravity settle, and unnecessary water rises with relatively light fine substances. Aggregate such as sand and water are easily separated when water is added alone in the process of preparing the filler. On the other hand, the filler 18 of this embodiment is added in a form in which water is contained in the concentrated sludge water. When the water is added in such a form, the ratio of the water separated from the aggregate is suppressed to a small value. For this reason, the breathing rate of the filler 18 is suppressed to a small value as compared with a filler or the like to which water is added alone.

Further, backfill materials for subway construction and cable line construction are excavated again when rework is required later. For this reason, it is desirable that the compressive strength of the backfill material is sufficiently strong for practical use and that it can be re-excavated, specifically, does not exceed 10 kgf / cm ² . The compounding ratio employed in the present embodiment is a value set so that the above-mentioned fluidity, breathing rate, compressive strength and the like are at appropriate levels.

FIG. 5 shows the contents of the experiment performed to determine the mixing ratio of the filler 18 and the results of the experiment. “Flow value” shown in FIG. 5 is a characteristic value indicating the fluidity of the test object. In this embodiment, the flow value is about 80 mm in diameter.
The test object is filled in a cylindrical container having a height of about 80 mm, and the test object is dropped on the floor by opening the bottom surface of the cylindrical container. This is a value measured for the direction. The flow value becomes larger as the test object shows higher fluidity.

"Appearance evaluation" shown in FIG. 5 is a result of relatively evaluating the appearance of the test object immediately after construction. Further, the compressive strength shown in FIG. 5 is a result of expressing the compressive strength (kgf / cm ² ) of the test object in relation to the number of curing days of the test object. The "sludge water" shown in FIG.
Means concentrated sludge water having a solid content of 20 to 30% by weight. In the following description, the weight ratio of the solid content in the sludge water is referred to as the concentration of the sludge water.

As shown in FIG. According to the compounding ratio of 3, the bleeding rate can be suppressed to a very small value, a good appearance evaluation can be obtained, and the filling material and backfilling can be performed at both the 7th curing day and the 28th curing day. Suitable strength can be obtained as a material. The test object No. The flow value “20.5 × 22” obtained with the compounding ratio of 3 is a value at which an appropriate fluidity can be obtained when the test object is used in the form shown in FIGS.

Therefore, in this embodiment, the filler 1
No. 8 is shown in FIG. The compounding ratio shown as 3 is determined. Therefore, according to the filler 18, when used in the form shown in FIGS. 1 to 4, a requirement relating to the fluidity required for the filler or the backfill material, a requirement relating to the breathing rate, a requirement relating to the appearance, And all the requirements regarding the compressive strength can be satisfied.

By the way, in this embodiment, the filler 1
No. 8 with No. 8 3 is determined,
The present invention is not limited to this, and the weight ratio of cement, the weight ratio of sand, and the weight ratio of concentrated sludge water are as follows: 3 or No. It can be changed within a range in which an evaluation substantially equivalent to the evaluation obtained by the compounding ratio shown in 2 can be obtained.

In this embodiment, No. 3 or No. 2. The weight ratio of the cement, the weight ratio of the sand, and the weight ratio of the concentrated sludge water, which can obtain substantially the same evaluation as the evaluation obtained by the compounding ratio shown in 2, are the "predetermined weights" Ratio ".

Next, a method of manufacturing the filler 18 of this embodiment will be described with reference to FIGS. FIG.
1 shows a side view of a car wash and an aggregate classification facility provided in a concrete plant, and a plan view of a water treatment facility provided adjacent to the aggregate classification facility.

An agitator vehicle 70 shown in FIG. 6 is a vehicle that has transported concrete to a construction site and then returned to a car wash. In the car wash shown in FIG. 6, the cargo room of the agitator car 70 used for transporting the concrete is washed. A car wash chute 72 is provided in the car wash area.
The concrete remaining in the luggage compartment of the agitator car 70 is washed with fresh water and then discharged onto the car wash chute 72.
As described later, sludge water is constantly circulating on the car wash chute 72. The concrete and washing water discharged onto the car wash chute 72 are mixed with sludge water in a raw water tank 74.
Flows into.

The raw water tank 74 has a first pump 76 near its bottom and a second pump 76 near its upper end. The first pump 76 is a pump for mainly pumping heavy sand and gravel from the substances flowing into the raw water tank 74 together with the sludge water.
On the other hand, the second pump 78 is a pump that is driven when the amount of water stored in the raw water tank 74 has reached a predetermined level or more. It is a pump for pumping cement together with sludge water.

The sand, gravel and sludge water pumped by the first pump 76 are supplied to a wedge screen 80. The wedge screen 80 is a device for classifying sand and gravel. Wedge screen 80
Has a mesh-shaped slope 82 that allows only sand to pass through. A crash fire 84 is provided below the slope 82. For this reason, sand and sludge water among the substances supplied to the wedge screen 80 from the first pump 76 flow into the crush fire 84. On the other hand, the gravel supplied to the wedge screen 80 is discharged from the lower end of the slope 82.

A cyclone 85 is provided above the crash fire 84. Cyclone 85
, Fine sand and sludge water are supplied from the second pump 78. The cyclone 85 takes out fine sand from the sludge water and returns it to the crash fire 84.

FIG. 6 shows the inside of the crash fire 84.
Crash fire 84
The screw which extends inside of this is arrange | positioned. The sand and fine sand that have flowed into the crush fire 84 are conveyed by the rotating screw, and
Is discharged from the right end.

A stock yard 86 is provided below the right end of the crash fire 84. In the stockyard 86, a storage room for storing sand and a storage room for storing gravel are separated. The sand discharged from the crush fire 84 and the gravel discharged from the wedge screen 80 are supplied to these storage rooms, respectively.

Sludge water from which sand and fine sand have been removed remains inside the crush fire 84. This sludge water is supplied to the above-described car wash chute 72 as circulating water. In addition, sludge water from which fine sand exceeding a predetermined particle size has been removed remains inside the cyclone 85.
This sludge water is supplied to a water treatment facility 88 provided adjacent to the aggregate classification facility.

The water treatment facility 88 has a plurality of water storage tanks. Sludge water discharged from the cyclone 85 is first supplied to a water storage tank 90. The sludge water supplied to the water storage tank 90 is supplied to the screw decanter 94 by the third pump 92. The screw decanter 94 is a device for separating sludge water into a material having a high specific gravity, that is, a material having a low specific gravity, that is, a material having a low cement content, while containing a large amount of cement.

The low specific gravity sludge water separated by the screw decanter 94 is discharged to a water storage tank 96. On the other hand, the high specific gravity sludge water separated by the screw decanter 94 is discharged to the concentration tank 100. In this embodiment, the operating conditions of the screw decanter 94 are determined so that the concentrated sludge water stored in the concentration tank 100 has a concentration of 20 to 30%.

The cement component contained in the sludge water is more likely to undergo a hydration reaction as the amount of water present around the cement component increases. When using sludge water as a raw material of the filler 18, it is desirable that cement components capable of causing a hydration reaction remain in the sludge water to some extent. If the sludge water is stored as concentrated sludge water, the storage amount of the sludge water can be reduced, and the hydration reaction of the cement contained in the sludge water can be delayed.

In this embodiment, the concentration of the concentrated sludge water is set to 20 to 30% so that the filler 18 exhibits an appropriate compressive strength after curing. The concentration of the concentrated sludge water is not limited to 20 to 30%,
As long as the compressive strength required for the filler 18 can be achieved,
It can be changed to a different value.

The concentrated sludge water stored in the concentration tank 100 is supplied to the vibrating ball mill 104 by the fourth pump 102. The vibrating ball mill 104 is a pulverizer having a plurality of iron balls therein. The concentrated sludge water pulverized by the vibration ball mill 104 is used as a raw material of the filler 18 in a later step.

In the concentrated sludge water, a cement component, fine sand, or the like may exist in a lump. Further, there is a case where the unhydrated cement component is present in a state covered with a dirt component. The vibrating ball mill 104 performs a pulverization treatment of the concentrated sludge water in order to pulverize the aggregated coarse particles and to expose the unhydrated cement component. According to the present embodiment, the concentrated sludge water is pulverized into a raw material for the filler 18, whereby the particle diameter of the raw material for the filler 18 is homogenized, and stable quality, specifically, stable non-separation is achieved. Properties (breathing resistance) can be ensured, and the hydration bonding force of the unhydrated cement will be used effectively,
Stable strength can be secured.

FIG. 7 is a flowchart showing a comparison between a general method for producing concrete and a method for producing the filler 18 of this embodiment. In FIG. 7, the raw materials described in the hatched columns are the raw materials of the filler 18. Also, the raw materials described above them are general raw materials for concrete.

That is, general concrete is produced by using an aggregate composed of cement, water, an admixture, and sand and gravel as raw materials, and kneading them in appropriate amounts. On the other hand, the filler 18 of the present embodiment
Is manufactured by kneading appropriate amounts of cement, concentrated sludge water, and aggregate sand.

The solid content contained in the concentrated sludge water is a substance originally contained in concrete. Therefore,
The raw material of the filler 18 does not contain any substance different from the raw material of the concrete. For this reason, the plant equipment used for kneading the filler 18 and the equipment for kneading general concrete can be shared without any adverse effect.

The sludge water used as a raw material for the filler 18 is a substance which has been conventionally treated at a high cost as industrial waste. By using sludge water as a raw material for the filler 18, it is possible to reduce the amount of industrial waste discharged, and to eliminate the cost required for waste treatment, and to enjoy great cost advantages. can do. As described above, the filler 18 is provided by utilizing existing facilities for manufacturing concrete.
It has the features that it can be manufactured without new capital investment and that the amount of industrial waste discharged can be reduced.

In the above embodiment, the sludge water and fine sand are separated by the cyclone 85 so that the “sludge water separation step” according to the second aspect of the present invention uses the screw decanter 94 to remove the sludge water. , Filler 18
The "sludge water concentrating step" according to claim 2 by concentrating to an appropriate concentration capable of realizing the required compressive strength, fluidity, inseparability, appearance, etc., of cement, concentrated sludge water, sand and The kneading step according to claim 2 is realized by kneading.

In the above embodiment, the filler 18 is used as a filler for construction work or a backfill material for excavation work. However, the use of the filler 18 is not limited to these. The filler 18 is, for example, a backfill material for an underground structure such as a common ditch, a backfill material for shield work, a filler material between an underground building and a retaining wall, a filler material filled in a steel pipe pile, and the like. Can also be used.

[0068]

As described above, according to the first aspect of the present invention, appropriate fluidity can be exhibited at the time of filling operation, stable quality can be easily maintained, and conventionally, it has been treated as industrial waste. A filler which uses sludge water as a raw material and can be easily produced in a general concrete plant is realized.

According to the second aspect of the present invention, a filler capable of exhibiting appropriate fluidity at the time of filling operation and maintaining a stable quality by simple management can be obtained by using sludge water as a raw material. It can be easily manufactured in a plant. Furthermore, according to the third aspect of the present invention, the filling work at the construction site is performed with high workability while suppressing generation of noise and dust by using a filler having appropriate fluidity. Can be.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a first usage example of a filler according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a second usage example of the filler according to one embodiment of the present invention.

FIG. 3 is a diagram illustrating a third usage example of the filler according to one embodiment of the present invention.

FIG. 4 is a diagram illustrating a fourth usage example of the filler according to one embodiment of the present invention.

FIG. 5 is a table showing the results of a test performed to determine a compounding ratio of a filler according to one embodiment of the present invention.

FIG. 6 is a view for explaining a process of producing concentrated sludge water as a raw material of a filler according to one embodiment of the present invention.

FIG. 7 is a flowchart illustrating a process of manufacturing a filler and a process of manufacturing general concrete according to one embodiment of the present invention.

[Explanation of symbols]

 12 Slope 16 Retaining wall 18 Filling material 20 Pump car 22,64 Piping 30,50 Excavated part 42,70 Agitator car 44 Outflow channel 62 Ground surface 72 Car wash chute 74 Raw water tank 80 Wedge screen 84 Crash fire 85 Cyclone 86 Stockyard 90 Water storage Tank 94 Screw decanter 100 Concentration tank 104 Vibration ball mill

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁶ identification code FI C04B 18/16 ZAB B09B 3/00 // C09K 103: 00 (58) Field surveyed (Int.Cl. ⁶ , DB name) C09K 17/10 B28C 7/00 B28C 7/16 C04B 18/16 C09K 17/02 B09B 3/00 C02F 11/00

Claims (3)

(57) [Claims] 1. After a curing time in the range of 7 to 28 days
The cement weighed at a predetermined weight ratio, the sand weighed at a predetermined weight ratio, the washing wastewater of concrete handling equipment, sand and gravel, and sludge water so that the compressive strength at a point is 10 kgf / cm ² or less. And the sludge water is separated by 20 to 3
1. A filler for construction work, comprising: concentrated sludge water measured by a predetermined weight ratio, which is obtained by concentrating to a solid content concentration of 0% by weight. 2. After a curing period in the range of 7 to 28 days
Compression strength at the points A manufacturing method of 10 kgf / cm ² or less is construction filler, a detergent drain concrete handling equipment, sand and gravel, and sludge water separation step of separating into a sludge water The sludge water separated in the sludge water separation step is
A sludge water concentration step of forming a concentrated sludge water having a solid content concentration of ３０30% by weight, a predetermined amount of the concentrated sludge water, and a predetermined amount of cement;
A method for producing a filler for construction work, comprising: a kneading step of kneading a predetermined amount of sand. 3. After a curing time in the range of 7 to 28 days
So that the compressive strength at the point is 10 kgf / cm ² or less,
By concentrating the cement weighed to a predetermined weight ratio, the sand weighed to a predetermined weight ratio, and the sludge water generated by washing the concrete handling equipment to a solid concentration of 20 to 30% by weight. The obtained construction work filler containing the concentrated sludge water measured at a predetermined weight ratio, a filler preparation step of loading the storage vehicle, and a filling site to be filled with the construction work filler, A pipe laying step of laying a pipe between the storage vehicle and a filler supply step of supplying the construction work filler from the storage vehicle to the filling site via the pipe. Filling method for construction work filler.