JP3137731U - Hume tube - Google Patents

Abstract

[PROBLEMS] To reduce the amount of waste disposal by expanding the processing of incineration ash generated regularly, to effectively use waste, to prevent environmental destruction, and in addition, it is necessary as a fume tube Providing a fume tube having strength and smoothness of the inner surface.
A tube body 2 has a ring-shaped fitting recess 3 formed in a shape in which the other end of the tube body 2 is fitted to one end of the tube body 2, and the tube body 2 and the fitting recess 3, at least the tube main body 2 is composed of 40 to 55% silicon dioxide (SiO2), 5 to 10% calcium oxide (CaO), 5 to 12% ferric oxide (Fe2O3), and 13 to 13 aluminum oxide (Al2O3). 25%, magnesium oxide (MgO) 5-10%, phosphorus pentoxide (P2O5) 5-15%, sodium oxide (Na2O) 0.5-3%, chloride 100 mg / kg or less, brain value 8000 cm2 / g or more, Use concrete containing 15% or less of sewage sludge incineration ash containing cement.
[Selection] Figure 1

Description

  The present invention relates to a fume pipe containing incineration ash obtained by incinerating sewage sludge that is constantly generated in a sewage treatment plant as a part of the raw material.

  In general, in sewage treatment facilities, sewage sludge containing a large amount of organic matter that is regularly removed from sewage is generated. In many cases, this sewage sludge is incinerated, and the incinerated ash generated thereby is conventionally landfilled as industrial waste.

  On the other hand, Hume pipes are formed by arranging rebars in a cylindrical mold for centrifugal molding, injecting concrete while rotating it, and finishing the inner surface with concrete attached to the inner surface of the mold by centrifugal force. The main raw materials are fine aggregates such as sand, coarse aggregates such as crushed stone, cement and water. Further, the strength of the fume tube needs to be maintained according to its use, and the strength is standardized according to the tube diameter.

  Further, the inner surface of the fume tube is required to have smoothness so that water can flow smoothly.

  In the sewage treatment facility mentioned above, sewage sludge is generated as long as it is in operation, and the ash that has been incinerated is continuously generated as long as the sewage treatment plant is in operation. However, in some cases, the landfill facility will become stuck and sewage treatment will not be possible.

  In addition, the aggregates used to manufacture the fume pipes are naturally produced, and the collection of these relies exclusively on river mining or mountain drilling. It is a problem.

  In view of such a situation, the present invention can reduce the amount of waste disposal by expanding the processing of incineration ash that occurs regularly, and can effectively use waste and prevent environmental destruction. In addition, the present invention has been made for the purpose of providing a fume tube having the necessary strength and smoothness of the inner surface as a fume tube.

  In order to solve the above-described conventional problems and achieve the intended purpose, the feature of the device according to claim 1 is that one end side of the cylindrical tube main body portion is connected to the other end side of the tube main body portion. A ring-shaped fitting recess that can be fitted is provided in a coaxial arrangement with the pipe body, and the pipe body is composed of 40 to 55% silicon dioxide (SiO2), 5 to 10% calcium oxide (CaO), Ferric oxide (Fe2O3) 5-12%, aluminum oxide (Al2O3) 13-25%, magnesium oxide (MgO) 5-10%, phosphorus pentoxide (P2O5) 5-15%, sodium oxide (Na2O) 0. Sewage sludge incineration ash containing 5 to 3%, chloride 100 mg / kg or less, brane value 8000 cm 2 / g or more is formed using concrete mixed with an amount of 15% or less of the cement amount. is there.

  The invention according to claim 2 is characterized in that the fitting recess is integrally formed of the same material as that of the tube main body.

  The invention according to claim 3 is characterized in that the fitting recess is formed by integrally providing a tubular joint member on one end side of the tube main body.

  As described above, the fume tube according to the present invention includes a ring-shaped fitting recess that can be fitted to the other end of the tube main body at one end of the cylindrical tube main body. The tube main body is composed of 40 to 55% silicon dioxide (SiO2), 5 to 10% calcium oxide (CaO), 5 to 12% ferric oxide (Fe2O3), and aluminum oxide (Al2O3). 13-25%, Magnesium oxide (MgO) 5-10%, Phosphorus pentoxide (P2O5) 5-15%, Sodium oxide (Na2O) 0.5-3%, Chloride 100 mg / kg or less, Blaine value 8000 cm2 / g The sewage sludge incineration ash containing the above is formed by using concrete mixed with an amount of 15% or less of the cement amount. It will be can be, it is possible to reduce the waste disposal volume of incineration ash, it is possible to prevent the environmental damage generated from the collection of the natural bone material. In addition, the workability and quality at the time of manufacturing the fume tube are within an allowable range, the smoothness of the inner surface is good, and the strength enough to withstand use as a fume tube is obtained.

  Further, the fitting recess can be easily formed by being integrally formed of the same material as that of the tube main body.

  Moreover, since the fitting recess is formed by integrally providing a tubular joint member on one end side of the tube main body, a fume tube having a suitable joint can be easily formed.

  Next, an embodiment of the present invention will be described.

  1 to 2 show an example of a fume tube according to the present invention. In the figure, reference numeral 1 denotes a fume tube. The fume tube 1 has a tube main body 2 formed in a cylindrical shape. A fitting recess 3 is formed integrally with the tube body 2 at one end side of the tube body 2.

  The fitting recess 3 is a portion formed in a stepped shape on the inner surface of one end side of the tube main body 2, and has a shape that allows the other end of the tube main body 2 to be fitted.

  Further, the other end side of the tube main body 2 is a fitting convex portion 4 having a stepped outer peripheral surface and a thin tip, and can be fitted into the fitting concave portion 3. .

  The outer diameter of the fitting recess 3 may be formed larger than the outer diameter of the tube main body 2.

  3 to 4 show other examples of the fume tube according to the present invention. In the fume tube 1 in this embodiment, a tubular joint member 5 is fitted on one end side of the tube main body portion 2, and the fitting recess 3 is formed on one end side of the tube main body portion 2 by the joint member 5. Is formed.

  The joint member 5 is formed in a cylindrical shape, and a substantially half of the front end side of the tubular joint member 5 is integrated with the tube main body 2, and a substantially half of the rear end side is the other side of the tube main body 2. It is formed in a shape that can be fitted to the side end.

  Further, in the approximately half of the tip end side of the joint member 5, irregularities having a corrugated cross-sectional shape are formed on the inner peripheral surface, and this inner peripheral surface is fitted to the outer peripheral surface of the tube main body 2. . Further, a ring-shaped packing 6 is fitted into the substantially half of the rear end side of the joint member 5.

  On the other end side of the tube main body 2, a fitting projection 4 having a ring shape, which can be inserted inside the joint member 5, is integrally formed. The fitting protrusion 4 has an inner circumference equal to the inner circumference of the tube main body 2 and an outer circumference smaller than the outer circumference of the tube main body 2.

  As shown in FIG. 4, the fitting convex part 4 of the other fume pipe | tube 7 is inserted and fitted inside the joint member 5 of the fume pipe | tube 1 comprised in this way. Further, between the joint member 5 of the fume pipe 1 and the fitting convex portion 4 of the other fume pipe 7, a packing 6 is compressed and interposed, and the fume pipe 1 and the other fume pipe 7 are maintained while maintaining watertightness. Are connected.

  In the fume tube according to the present invention, a tube branch may be formed on the side surface of the tube main body 2. Moreover, the pipe body 2 may be bent. Further, the fitting convex portion 4 may be formed to be equal to the inner and outer diameters of the body portion of the tube main body portion 2.

  As for the above-mentioned fume pipe | tube 1, the pipe | tube main-body part 2 is centrifugally formed using the concrete containing incinerated ash. Next, the concrete containing incinerated ash will be described.

  In general, the components of sludge contained in sewage are almost the same nationwide, but the difference in the process of separating this from sewage, that is, the difference in the additives used, and the sludge that has settled and separated from the sewage in the cake The components of the incinerated ash that remains after incineration differ depending on the dehydration method used when converting to dehydration. The incineration ash used in the present invention is the one generated when incineration is performed on sludge obtained using a polymer flocculant without using lime or ferric chloride as a sewage treatment material.

  As an example of the incineration ash used in the present invention, the component analysis results of the incineration ash A and B generated at the treatment plant in Tokyo are shown in Table 1.

Table 1

  When manufacturing structures using fresh concrete, the manufacturer always has the following in mind: 1. Maintain a predetermined (objective) strength. 2. The concrete of the manufactured structure shall not be permanently altered. 3. The workability (workability) of concrete at the time of manufacture is an appropriate value. The appearance of the manufactured structure is clean.

  All of these are important factors, but workability is particularly important. Increasing the amount of water to improve workability (increasing the flowability of fresh concrete) reduces quality and durability. Must be managed strictly.

  Therefore, a lot of consideration is given to the material and mix design when making concrete. For example, even if the material satisfies the strength and the like, the material having the property of impairing workability is not suitable as a concrete material. As an aggregate as a material that impairs workability, a material having a good water absorption rate is a representative example.

  In addition to the incineration ash used in the present invention, there is an incineration ash that uses lime as a sewage sludge treatment material, which contains a large amount of calcium hydroxide as a component of the incineration ash and has a high water absorption rate. In order to obtain the same workability by using the same amount of incinerated ash as used in the present invention, a large amount of water must be used, and naturally the concrete is inferior in strength and durability.

  In general, engineers working with concrete are reluctant to reduce the water-cement ratio in concrete, reduce the amount of water, and produce high-quality concrete on a daily basis.

  In addition, the inner surface of a fume tube made of concrete mixed with incinerated ash becomes a smooth inner surface as compared with normal concrete. In this case, when centrifugal molding is performed, the fine particles in the concrete are applied to the inner surface due to the difference in specific gravity, and are stuck by centrifugal force. This is because the cement usually has a brane value of 4000 cm 2 / g or a blast furnace slab brane value of 4000 to 6000 cm 2 / g, whereas the incinerated ash has a brane value of 8000 cm 2 / g or more.

  Next, the test example which changed the mixing rate of the incineration ash in concrete using the incineration ash shown in Table 1 is shown.

The materials used in the test examples described below are as follows.
Cement C: Normal Portland cement (ρc = 3.16, Taiheiyo Cement)
Fine aggregate S1: Crushed sand (Ps1 = 2.60, Kamisato-cho, Kodama-gun, Saitama Prefecture, FM = 2.96)
Fine aggregate S2: natural sand (ρs2 = 2.64, Kamisato-cho, Kodama-gun, Saitama Prefecture, FM = 3.09)
Coarse aggregate G: crushed stone No. 6 (ρG = 2.70, FM = 5.91 from Kamisato-cho, Kodama-gun, Saitama)
Expandable material GP: Gypcal (ρGP = 3.00, Taiheiyo Cement)
Water reducing agent M150RX: Mighty 150RX (high performance water reducing agent) (manufactured by Kao Corporation)
Incinerated ash B: Tokyo New River Bank (Tokyo Sewerage Bureau ρashB = 2.60)
When the incinerated ash was added instead of aggregate, the effect on the workability of mortar was tested.

  As a result of testing the water-cement ratio to obtain a certain mortar workability, the incineration ash was added at a rate of 5, 7, 10 and 20% to the cement (hereinafter simply referred to as the addition rate). Table 2 shows the composition of mortar for achieving a constant flow value (target flow value: 210 mm ± 20 mm).

  In the table, W / S is a water cement ratio, S / C is an aggregate cement ratio, and W is water (the same applies hereinafter).

Table 2

  Similarly, as a result of the test on the influence of the water reducing agent for obtaining a certain workability, the mortar composition when the flow value (target flow value: 210 mm ± 20 mm) and the water cement ratio are constant is shown in Table 3. It was like.

Table 3

  From the above test results, the relationship between the incinerated ash usage rate, the water cement ratio, and the water reducing agent addition rate in the mortar is as shown in FIG.

  Table 4 shows the results of testing the mixing time in the formulations shown in Tables 1 and 2 above.

Table 4

  The mortar in the above kneading test was mixed with a 10 liter mortar mixer. Cement, sand, incinerated ash, water and water reducing agent were put into a kneading bowl at a time, and kneaded for 30 seconds. The mortar attached to the paddle and the kneading bowl was scraped off and then mixed for 60 seconds, and then the flow value was measured. The final mixing time was extended depending on the mixing conditions of the mortar.

  Compound No. 1-0 No. For 2-15, the flow value was within the allowable range. In 2-20 (incineration ash utilization rate of 20%), the prescribed workability could not be obtained even though the water reducing agent was increased.

  In addition, in the formulation with an increased water reducing agent, the required mixing time increased when the incineration ash utilization rate exceeded 10%.

  When the incinerated ash was added instead of aggregate, the effect on the workability of concrete was tested.

  As a result of testing the water-cement ratio to obtain a certain cement workability, the slump is constant when the incineration ash is added at a rate of 5, 7, 10 and 20% to the cement (target slump: Table 5 shows the concrete composition for achieving 8 cm ± 2 cm.

  In the table, S / a is the ratio of fine aggregate to coarse aggregate.

Table 5

  Similarly, as a result of the test on the influence of the water reducing agent to obtain a certain workability, the concrete mixture when the slump (target slump: 8 cm ± 2 cm) and the water cement ratio are constant is as shown in Table 6. Met.

Table 6

  From the above test results, the relationship between the incinerated ash usage rate, the water cement ratio and the water reducing agent addition rate in concrete is as shown in FIG.

  Table 7 shows the results of testing the mixing time and the mixing condition of the concrete shown in Tables 5 and 6 above.

Table 7

  In the mixing test, the concrete was mixed using a pan-type forced mixing mixer (maximum mixing capacity 55 liters) and the mixing amount was 45 liters. Cement, sand and incinerated ash are put into the mixer for 30 seconds, and water and a water reducing agent are added and mixed for 30 seconds to form a mortar. The mixer is once stopped and gravel is added. Kneaded for 60 seconds. Also, the final mixing time was extended depending on the mixing condition of concrete.

  To keep the slump constant, the water cement ratio and the water reducing agent addition rate tend to increase as the incineration ash usage rate increases, and the incineration ash usage rate increases rapidly from around 10%.

  From the above results, when the utilization rate of incinerated ash exceeds 10% for both mortar and concrete, the water-reducing agent addition rate required to obtain the required workability increases, increases rapidly, and the viscosity of concrete increases. Therefore, workability also deteriorates. For this reason, in order to ensure the workability associated with the use of incinerated ash, it is better to increase the unit water volume than to increase the water reducing agent, and in particular, the incinerated ash ratio is within 15% and the water cement ratio is 40 to 46%. preferable.

  The effect of the use of incinerated ash on the centrifugal formability of the fume tube was tested.

  Concrete mix No. mentioned above. a-0 to No. a-20 and no. b-0-No. Regarding b-20, the required high-speed compaction time and the compaction properties of the inner surface were tested, and the results were as shown in Table 8.

Table 8

  From this result, the compaction time increases with an increase in the usage rate of incinerated ash, and the tendency is stronger as the workability is improved by using a water reducing agent. In addition, blending No. a-20 and no. In b-10 to b-20, even if the compaction time is increased, the compactness of the inner surface is poor. In the formulation with improved workability by increasing the water cement ratio, an incineration ash usage rate of 15% or less can be used as a fume tube, but the same usage rate of 5 to 7% is more preferable. found.

  The effect of the use of incineration ash on the fume tube strength was tested.

  Concrete mix No. mentioned above. a-0, No. a-5, no. As a result of manufacturing a fume tube having a nominal diameter of 250, 400, 700 and 900 for each blend of a-15 and comparing the strength with the standard value and the smoothness of the inner surface of a normal fume tube, It was like that. The standard value is the strength of ordinary concrete calculated by the elastic strength.

  The smoothness was determined by visual observation.

Table 9

  From this result, if the usage rate of incineration ash is within 15% of the cement, all the specified values of the fume pipe were exceeded, and there was no difference from the fume pipe not using incineration ash.

  From the above-mentioned various test results, in the case of incinerated ash generated by the method using a polymer flocculant in the dewatered cake manufacturing process in the sludge treatment process, the components are as follows and the inner surface is smooth: As a possible material, it can be used without affecting the workability and strength during the production of the fume tube.

  Silicon dioxide (SiO2) 40-55%, calcium oxide (CaO) 5-10%, ferric oxide (Fe2O3) 5-12%, aluminum oxide (Al2O3) 13-25%, magnesium oxide (MgO) 5-10 %, Phosphorus pentoxide (P 2 O 5) 5 to 15%, sodium oxide (Na 2 O) 0.5 to 3%, chloride 100 mg / kg or less, brain value 8000 cm 2 / g or more.

  In addition, due to the workability of mortar and concrete, it is preferable that the usage rate of incineration ash is within 15% of the cement and the water cement ratio is 35% to 50%.

  Furthermore, the effect on the strength of the fume tube is sufficiently higher than the specified value when the usage rate of the incinerated ash is within 15% of the cement, and the same strength as that without the incinerated ash is obtained. .

It is side sectional drawing which shows an example of the fume pipe | tube of this invention. It is a front view same as the above. It is a sectional side view which shows the other example of the fume pipe | tube of this invention. It is a partial expanded sectional view which shows the connection structure of a fume pipe | tube same as the above. The graph which shows the relationship between the incinerated ash usage rate in concrete, a water cement ratio, and a water reducing agent addition rate. The graph which shows the relationship between the incinerated ash usage rate in a mortar, a water cement ratio, and a water reducing agent addition rate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hume pipe | tube 2 Pipe | tube main-body part 3 Fitting recessed part 4 Fitting convex part 5 Joint member 6 Packing 7 Other fume pipes

Claims (3)

On one end side of the cylindrical tube main body portion, a fitting recess having a ring shape in which the other end side of the tube main body portion can be fitted is provided in a coaxial arrangement with the tube main body portion,
The tube body is composed of silicon dioxide (SiO2) 40 to 55%, calcium oxide (CaO) 5 to 10%, ferric oxide (Fe2O3) 5 to 12%, aluminum oxide (Al2O3) 13 to 25%, magnesium oxide Sewage sludge incineration containing (MgO) 5-10%, phosphorus pentoxide (P2O5) 5-15%, sodium oxide (Na2O) 0.5-3%, chloride 100 mg / kg or less, brain value 8000 cm2 / g or more A fume tube made of concrete mixed with ash mixed in an amount of 15% or less of the cement.   The fume tube according to claim 1, wherein the fitting recess is integrally formed of the same material as the tube main body.   The fume tube according to claim 1, wherein a fitting member having a cylindrical shape is integrally provided on one end side of the tube main body portion to form the fitting recess.