JP2020093976A - Grout material for sewer pipe renovation method and sewer pipe renovation method using same - Google Patents

Abstract

To provide a grout material for a sewer pipe renovation method and the sewer pipe renovation method, comprising: installing a separate pipe in a deteriorated sewer pipe, filling mortar as a grout material in a gap generated between the two, and curing the mortar to obtain a composite pipe having strength comparable to that of a newly constructed pipe.SOLUTION: Provided is a grout material for a sewer pipe renovation method formed of a grout material composition comprising cement, lightweight aggregates, a mineral that imparts underwater inseparability, and an additive as essential components, where mortar obtained by adding a predetermined amount of water to a grout material composition followed by mixing has the following properties as measured by specific test methods: 1. a unit volume mass of 1.30 to 1.40 Kg/L; 2. a flow-down time of 5 to 7 seconds; 3. a pull-out flow value of 210 to 290 mm; 4. underwater inseparability: an amount of suspended substance of 0.80 g or less; 5. a unit volume mass difference of 0.05 Kg/L or less between an upper part unit volume mass and a lower part unit volume mass as obtained by a 4 m injection test; and 6. compression strength of 21 to 60 N/mm.SELECTED DRAWING: Figure 1

Description

The present invention relates to an aged grout material for a sewer pipe rehabilitation method (hereinafter, may be simply referred to as a grout material) and a sewer pipe rehabilitation method using the grout material, and more specifically, a component necessary as a grout material. Is a single-part grout material that can create a mortar with excellent fluidity in which each component is uniformly dispersed in a short time by adding a predetermined amount of water and stirring. Yes, in the presence of sewage inside the aging mortar pipe, a separate pipe is installed, when filling the mortar in the gap with the sewage remaining in the gap between the two, Part of the mortar melts into the sewage or the components of the mortar do not change, and the sewage can be stably and uniformly filled into the gap while being discharged to the outside. The present invention relates to a grouting material for a sewer rehabilitation method and a sewer rehabilitation method using the same, in which a cured product can be obtained after being discharged and then a uniform cured product can be obtained, and a composite pipe having a strength comparable to that of a new pipe can be obtained. ..

Agricultural water pipes, sewer pipes, and water pipes are durable, but they are buried underground and used for an extremely long period of time, so deterioration is inevitable. Therefore, the inside of the existing pipe may be lined in order to rehabilitate the old pipe that has deteriorated due to cracking or corrosion. As one of the methods for lining an existing pipe, a method of arranging a new new pipe (hereinafter sometimes referred to as a lining pipe or profile) inside the existing pipe is known.

That is, the pipe lining construction method of the prior art is that a device called a pipe making machine is carried into the existing pipe, a strip-shaped member is supplied to the pipe making machine, and a strip-shaped member is wound inside the existing pipe to make a new lining pipe. To mold. The lining pipe newly formed by the pipe making machine is smaller than the inner diameter of the existing pipe. Therefore, there is a gap between the existing pipe and the lining pipe, not only the position of the lining pipe becomes unstable, but also the pressure of water flowing through the lining pipe cannot be applied to the existing pipe, and the lining pipe is The strength cannot be secured.

Therefore, in order to secure the strength of the lining pipe placed inside, from the cement-based filler that mixes the necessary components using the backfill material injection device between the inner surface of the existing pipe and the outer surface of the lining pipe newly installed inside. A backfill material (also referred to as grout material) is injected (see Patent Documents 1-6).
According to this method (SPR method: Swadge Pipe Renewal), a three-layer composite pipe consisting of an existing pipe, a filler and a lining pipe is formed, and the strength of an aged existing pipe can be restored to a strength comparable to that of a new pipe. it can.

In the construction method, on the site, necessary components are weighed, mixed, water is added, and the mixture is stirred to create a cement-based filler slurry. It is assumed that problems such as occurrence of such a phenomenon impair fluidity and an accident such as deterioration of strength of a cured product occur.
In order to prevent the lining pipe from floating, it is preferable that the cement-based filler has a low unit volume mass, and it is necessary to inject the filler into a long and narrow space between the existing pipe and the lining pipe placed inside. Therefore, the property of high fluidity is also required, and if the strength of the cured product can be increased, it can be used even in construction sites with large voids, so the development of a cement-based filler having such properties is desired. Was there.

By the way, as mentioned above, reinforced concrete pipes, which are sewer pipes, are also buried underground and used for an extremely long period of time. Rehabilitation of sewer pipes has become an indispensable issue for maintaining a social life because not only the function of the drainage pipe is deteriorated but also secondary damage such as road collapse is feared.
Specifically, in the SPR method, for example, a hard vinyl chloride profile is fitted and installed in a corrosion-deteriorated existing pipe ditch, and then mortar (grout material) is injected into the gap between the existing pipe and the profile. Therefore, it is a rehabilitation method to be integrated as a composite pipe. Specifically, for example, since there are all cross-sectional shapes of existing pipe inner diameter 250 mm to 5000 mm, non-circular pipe culvert short side 900 mm or more, long side 6000 mm, In addition to being able to deal with it, it is required to be able to perform construction even under the common use of sewage, and the target is the rehabilitation of a pipe with a small inner diameter where people cannot enter the pipe to work.
In the construction, since the profile is installed in the existing pipe and the voids are filled with mortar, buoyancy is generated in the profile and it is necessary to take measures to prevent levitation. In the case of a large-diameter pipe that allows people to work inside the pipe, it is easy to prevent levitation, but in a pipe with a small internal diameter that people cannot enter, buoyancy can be reduced. A mortar of a small type is required (see Patent Document 7).
A grout material to which bentonite or the like is added has also been proposed (see Patent Documents 8-10).

In addition, in the SPR method for sewer pipes, usually, while flowing sewage into the existing pipe (under common use of sewage), attach a profile in the existing pipe, seal only the voids at both ends, and mortar the voids. Since the mortar to be filled comes into contact with the sewage remaining in the gap and is discharged while discharging, the mortar itself and its components are dissolved into the sewage during the contact with the sewage. Component changes occur, for example, mortar concentration and component changes occur in the upper and lower parts of the mortar in the flow direction and gravity direction, and there is a difference in the unit volume mass of the filled mortar described later, and thus it is uniform and stable. When the mortar filled was not able to be filled and hardened, a uniform hardened product could not be obtained, and there was a problem that the compressive strength and the like varied.

JP 2001-19523 A JP 2001-19528 A JP, 2002-338320, A JP, 2003-42345, A JP, 2007-45650, A JP, 2009-132557, A JP, 2013-256433, A Japanese Examined Patent Publication No. 64-002834 JP, 2004-284930, A JP, 2013-249214, A

A first object of the present invention is to install a separate pipe inside the deteriorated sewage pipe and fill the gap between the two with sewage inside the sewage pipe. Even if there is residual sewage in the mortar, the mortar comes into contact with the sewage, and part of the mortar begins to dissolve into the sewage, so that it does not separate, and the sewage is stably discharged to the outside. Since it is possible to fill the gap uniformly, by curing the mortar filled in the gap, a uniform cured product is obtained, and a grout material for the sewer rehabilitation method that a composite pipe with a strength comparable to a new pipe can be obtained. To provide.
A second object of the present invention is to install a separate pipe inside an existing pipe in which sewage is present using the grouting material for sewage pipe rehabilitation method of the present invention, so that the sewage remaining in the gap between the two is Even if there is mortar in contact with the sewage in the gap, the mortar can be filled into the sewage without melting, the sewage can be easily discharged, and then cured to obtain a uniform cured product. Another object of the present invention is to provide a sewer pipe rehabilitation method in which a composite pipe having a strength comparable to that of a new pipe can be obtained.

As a result of intensive studies conducted by the inventors to solve the above problems, cement, a lightweight aggregate, a water-inseparability-imparting mineral and a grout material composition consisting of granules containing admixtures as essential components have a predetermined amount of water. The mortar with added and mixed is specified in terms of unit volume mass, falling time, drawing flow value, inseparability in water, unit volume mass difference between upper unit volume mass and lower unit volume mass obtained in 4m injection test, compression strength, etc. It was found that the above problems can be solved by using a grout material composition having a value of, and the present invention has been accomplished.

The invention according to claim 1 of the present invention for solving the above-mentioned problems is composed of a grout material composition consisting of a granular material containing cement, a lightweight aggregate, an inseparability imparting mineral in water and an admixture as essential components. A grout material for sewage pipe rehabilitation method,
Mortar obtained by adding and mixing a predetermined amount of water to the grout material composition has the following properties measured by the following test method. ~6. It is a grout material for a sewer pipe rehabilitation method characterized by being equipped with.

(Mortar property)
1. Unit volume mass is 1.30 to 1.40 Kg/L,
2. Flow time is 5 to 7 seconds,
3. Withdrawal flow value of 210-290 mm,
4. Inseparability in water: Suspended substance amount 0.80g or less,
The unit volume mass difference between the upper unit volume mass and the lower unit volume mass obtained in the 5.4 m injection test is 0.05 Kg/L or less,
6. Compressive strength is 21 to 60 N/mm ² .

(Test method)
1. Unit volume mass: According to JIS A 1116 "Unit volume mass test method for fresh concrete and test method by mass of air amount (mass method)", kneaded sample (mortar) is put in a 1 L container and measured.

2. Flow-down time: Hold the mortar with your finger to hold the outlet of the J14 funnel specified by JCCE-F541 “JETCE-F541 “Determination of fluidity of filled mortar (draft)”, fill the mortar, and remove your finger from the outlet to remove the mortar. The flow-out time (unit: second) until the mortar flow from the outlet is interrupted for the first time is measured.

3. Extraction flow value: The flow cone specified in JIS R5201-1999 "Cement physical test method" is filled with mortar, and the spread when the flow cone is pulled up vertically is measured.

4. Underwater inseparability: Using the underwater inseparability test apparatus shown in FIG. 4 installed with an inclination of 10 degrees, 300 mL of water was put into a cylindrical container A having a diameter of 80 mm and a length of 200 mm, an inner diameter of 20 mm, and a height of 500 mm. 1000 mL of mortar filled in the vinyl chloride pipe B was poured into the cylindrical container A by opening the valve C, and the extruded suspended water was collected on the filter paper at the collection place D, and the suspension collected on the filter paper was cooled to 100° C. 1 The amount of suspended matter (g) dried for time is determined.

5.4m injection test: A 4m injection test device shown in FIG. 5 (two fume tubes with an inner diameter of 350 mm and a length of 2000 mm are connected to each other, and an outer diameter is set in an injection port and an upper sampling place and a lower sampling place. A profile having a length of 330 mm and a length of 4500 mm is installed, and a gap between the fume tube and both ends of the profile is sealed. 10 L of water is put into the gap.), and the mortar is squeezed into the injection port. Mortar was injected at a flow rate of 15 L/min, and the mortar flowing out from the upper sampling site and the lower sampling site was collected as the upper sample and the lower sample, respectively, and the upper unit volume mass and the lower unit volume mass were measured. Calculate the unit volume mass difference between the mass and the lower unit volume mass.

6. The compressive strengths of the upper sample and the lower sample are measured by the following test method (compressive strength):
In accordance with JSCE-G521 of the Japan Society of Civil Engineers, mortar is filled and molded in a mold of φ50×100 mm, demolded at the age of 2 days, put in a plastic bag until the age of the test material, and the temperature is 20°C±2°C. It is aged in a room, the material age is 28 days, and the pressure is measured using a pressure resistance tester (Maekawa Tester Co., Ltd., 1000 kN).

The invention according to claim 2 of the present invention is the grout material for a sewer rehabilitation method according to claim 1, wherein the water inseparability imparting mineral is a smectite clay mineral, and the addition amount is cement, lightweight aggregate, or admixture. 5 parts by mass or less relative to 100 parts by mass of a composition containing a material as an essential component, a swelling power measured by the following test method of 10 ml/2 g or more, and a swelling amount that is a product of the addition amount and the swelling power is 15 to 60. It is characterized by being.

(Test method)
1. It is measured according to the Japan Bentonite Industry Association standard test method JBAS-104-77 "Bentonite (powdered) swelling test method".

The invention according to claim 3 of the present invention is the grout material for a sewer pipe rehabilitation method according to claim 1 or 2, wherein the water inseparability-imparting mineral is a holmite-based clay mineral, and the addition amount is cement or lightweight. It is characterized in that it is 1 to 3 parts by mass with respect to 100 parts by mass of the composition containing the aggregate and the admixture as essential components.

The invention according to claim 4 of the present invention is the grout material for a sewer pipe rehabilitation method according to any one of claims 1 to 3, wherein the underwater non-separation imparting mineral is a smectite clay mineral and a holmite-based mineral. It is characterized by being a mixture with clay minerals.

The invention according to claim 5 of the present invention is a construction site, wherein the grout material composition according to any one of claims 1 to 4 is mixed with a predetermined amount of water and stirred, and then the test method is used. The following properties measured 1. ~6. Create a mortar that has, in a state where sewage is present inside the existing sewer pipe, install a separate pipe, fill the gap with the mortar in a state where sewage remains in the gap between the two, In the sewage pipe rehabilitation method, the mortar cures after the sewage is discharged and filling is completed.
(Mortar property)
1. Unit volume mass is 1.30 to 1.40 Kg/L,
2. Flow time is 5 to 7 seconds,
3. Withdrawal flow value of 210-290 mm,
4. Inseparability in water: Suspended substance amount 0.80g or less,
The unit volume mass difference between the upper unit volume mass and the lower unit volume mass obtained in the 5.4 m injection test is 0.05 Kg/L or less,
6. Compressive strength is 21 to 60 N/mm ² .

The invention according to claim 1 of the present invention is a grout for a sewer rehabilitation method, which is composed of a grout material composition consisting of a granular material containing cement, a lightweight aggregate, an underwater non-separation imparting mineral and an admixture as essential components. Material,
Mortar obtained by adding and mixing a predetermined amount of water to the grout material composition has the above-described properties 1. ~6. It is a grout material for a sewer rehabilitation method characterized by comprising:
When a separate pipe is installed inside the aged sewer pipe, and when filling the gap between the two, there is sewage inside the sewer pipe, and even if there is sewage remaining in the gap, the mortar remains By contacting the sewage and causing part of the mortar to dissolve into the water, it does not separate, and the sewage can be stably and uniformly filled into the gap while being discharged to the outside. When the filled mortar is cured, a uniform cured product is obtained, and a remarkable effect is obtained that a composite pipe having a strength comparable to that of a new pipe is obtained.
In addition, the said predetermined amount of water is the said 1st property which the said mortar measured by the said test method. ~6. It means the amount of water required to prepare.
The present invention is a one-piece grout material in which all the necessary components as a grout material are blended as powder and granules, and if each component is added and stirred at the site with a predetermined amount of water, each component becomes uniform in a short time. Since it is possible to create a mortar that has excellent fluidity and resistance to separation of each component, it does not take time and costs, and the problem that fluidity is impaired due to mismeasurement and the strength of the cured product are impaired. There is a remarkable effect that there is no problem such as.

In the grout material of the present invention, if a predetermined amount of water is added and stirred, it is possible to obtain a mortar in which each component is uniformly dispersed in a short time and which is excellent in separation resistance of each component.

By using the grout material of the present invention, lightweight, high strength, fluidity, material separation resistance of each component, pumpability, adhesiveness, durability, chemical resistance, resistance to temperature change, sewer pipe An excellent cured product having strength required in the field can be obtained.

The invention according to claim 2 of the present invention is the grout material for a sewer rehabilitation method according to claim 1, wherein the water inseparability imparting mineral is a smectite clay mineral, and the addition amount is cement, lightweight aggregate, or admixture. 5 parts by mass or less with respect to 100 parts by mass of a composition containing a material as an essential component, a swelling force measured by the test method of 10 ml/2 g or more, and a swelling amount that is a product of the addition amount and the swelling force is 15 to 60. It is characterized by
Even when mortar comes into contact with sewage when filling the gap, it does not separate (high water inseparability) due to the fact that part of the mortar begins to dissolve in the water and has good fluidity. It has an even more remarkable effect that it can be filled while holding.

The invention according to claim 3 of the present invention is the grout material for a sewer pipe rehabilitation method according to claim 1 or 2, wherein the water inseparability-imparting mineral is a holmite-based clay mineral, and the addition amount is cement or lightweight. Aggregate, 1 to 3 parts by mass with respect to 100 parts by mass of a composition containing an admixture as an essential component,
Even when mortar comes into contact with sewage when filling the gap, it does not separate (high water inseparability) due to the fact that part of the mortar begins to dissolve in the water and has good fluidity. It has an even more remarkable effect that it can be filled while holding.

The invention according to claim 4 of the present invention is the grout material for a sewer pipe rehabilitation method according to any one of claims 1 to 3, wherein the underwater non-separation imparting mineral is a smectite clay mineral and a holmite-based mineral. It is characterized by being a mixture with clay minerals,
Since a mixture of smectite-based clay minerals and holmite-based clay minerals was used, even when the mortar came into contact with sewage when filling the gap, it was more likely that some of the mortar would dissolve into the water. It is less and does not separate (higher inseparability in water), and because it can be filled with better fluidity, it is possible to reduce the amount of minerals imparted with inseparability in water, which is economical. Has a great effect.

The invention according to claim 5 of the present invention is a construction site, wherein the grout material composition according to any one of claims 1 to 4 is mixed with a predetermined amount of water and stirred, and then the test method is used. The measured properties 1. ~6. Create a mortar that has, in a state where sewage is present inside the existing sewer pipe, install a separate pipe, fill the gap with the mortar in a state where sewage remains in the gap between the two, A sewage pipe rehabilitation method characterized in that the mortar is cured after discharging the sewage and completing filling.
If a separate pipe is installed inside the existing pipe where sewage exists inside, even if there is sewage remaining in the gap between the two, the mortar melts into the sewage while contacting the mortar with the sewage. There is a remarkable effect that the sewage can be easily discharged without being filled, and then cured to obtain a uniform cured product and a composite pipe having a strength comparable to that of a new pipe.

(A)-(D) is explanatory drawing explaining an example of the sewer pipe rehabilitation construction method of this invention. FIG. 2 is an explanatory diagram in which a part of FIG. 1B is enlarged. FIG. 3 is an explanatory diagram in which a part of FIG. 1C is enlarged. FIG. 4 is an explanatory diagram illustrating the underwater non-separation test apparatus. FIG. 5 is an explanatory diagram illustrating a 4 m injection test device.

Next, embodiments of the present invention will be described in detail.
1(A) to 1(D) are explanatory views illustrating an example of the sewer pipe rehabilitation method of the present invention. FIG. 2 is an explanatory diagram in which a part of FIG. 1B is enlarged. FIG. 3 is an explanatory diagram in which a part of FIG. 1C is enlarged.
As shown in FIG. 1(a), an existing pipe 1 is installed underground. 2 is a manhole. Sewage 3 flows in the existing pipe 1.
As shown in FIG. 1(b), when rehabilitating the deteriorated existing pipe 1, inside the existing pipe 1, an outer winding profile drum 4 and a pipe making machine 6 equipped with a power unit 5 are used to remove both side edge portions. The profile 7 having a joint portion is continuously fed and spirally wound, and the joint portions which are in contact with each other are joined by fitting to form a tubular body 8 of the profile. Sewage 3 flows in the tubular body 8 of the profile. A gap 9 is formed between the existing pipe 1 and the tubular body 8 of the profile.
As shown in FIG. 1C, while maintaining the state in which the sewage 3 has flowed in the tubular body 8 of the profile, seals 10 are installed in the gaps 9 at both ends of the tubular body 8 of the profile to seal the tubular body 8. After installing the air/sewage drainer 11 at one end on the downstream side, the backfilling mortar injecting machine 12 is operated, and a predetermined amount of water is added to the grout material of the present invention on site to prepare mortar, The created mortar 13 is filled in the gap 9 formed between the existing pipe 1 and the tubular body 8 of the profile.
As shown in FIG. 1D, after the mortar 13 is completely filled in the gap 9 between the existing pipe 1 and the tubular body 8 of the profile, the mortar 13 can be cured to obtain a cured product (rehabilitation pipe 14). it can.

2 and 3, the same symbols as those in FIG. 1 indicate the same components as those described in FIG. Reference numeral 15 shown in FIGS. 2 and 3 is an injection port of the mortar 13. 2 and 3, the upper gap 9 is described wider than the lower gap 9, but in this construction example, when the sewage 3 flows after the sewage pipe is rehabilitated, the step difference becomes as small as possible and the low resistance is obtained. It was done in order to become. In some cases, the upper clearance 9 and the lower clearance 9 may have the same width.

As a method of arranging a new lining pipe inside the existing pipe 1, there is a method of inserting a new pipe (not shown) into the existing pipe 1, but any method may be used.

According to this construction method, a three-layer composite pipe composed of the existing pipe 1, the cured product 14 and the tubular body 8 of the profile is formed, and the strength of the aged existing pipe 1 can be restored to a strength comparable to that of the new pipe. ..

FIG. 4 is an explanatory diagram illustrating the underwater non-separation test apparatus.
As shown in FIG. 4, the underwater non-separation test apparatus 16 is provided with a cylindrical container A having a diameter of 80 mm and a length of 200 mm with an inclination of 10 degrees with respect to a horizontal plane, and one end of the cylindrical container A is installed. A PVC pipe B having an inner diameter of 20 mm and a height of 500 mm, which is provided with a funnel 17 at the upper end, is vertically connected through the valve C, and the other end of the cylindrical container A is used for collecting a sample. A collection place D is provided.

300 mL of water was put into the cylindrical container A, 1000 mL of mortar filled in the PVC pipe B was poured into the cylindrical container A by opening the valve C, and the extruded suspended water was placed in the funnel 18 installed at the upper part of the beaker 20 at the collection place D. It is collected on the set filter paper 19, and the residue collected on the filter paper 19 is dried in a dryer (not shown) at 100° C. for 1 hour. After drying, the dry mass (g) including the filter paper 19 is obtained. The amount of suspended matter (g) is calculated by the following formula.
Suspended substance amount (g)=dry mass (g)-filter paper mass (g).

FIG. 5 is an explanatory diagram illustrating a 4 m injection test device.
As shown in FIG. 5, the 4 m injection test device 21 was connected to two fume tubes 22 having an inner diameter of 350 mm and a length of 2000 mm, and the upper part of the sample was collected in the fume tube 22 provided with the injection port 15 for the mortar 13. A tubular body 8 having an outer diameter of 330 mm and a length of 4500 mm, which has a location 23 and a lower sampling location 24, is installed. A seal 10 is installed by sealing in a gap 9 between both ends of the fume tube 22 and the tubular body 8 of the profile, and 10 L of water is put in the gap 9. When 10 L of water is put into the gap 9, about 100 mm of water will enter from the bottom of the fume tube 22 upward to the dotted line position in the figure.
The 4 m injection test device 21 is a grout mixer (OKZ-150W, Okasan Kiko Co., Ltd.) 26 for putting water and powder and kneading to create the mortar 13, and a container (90 L) 27 for containing the created mortar 13. , A squeeze pump (Okasan Kiko Co., Ltd. OKP-15MS) 28 for injecting the mortar 13 into the gap 9 through the inlet 15 of the 4 m injecting test device 21, and a passage for the mortar 13 for injecting the mortar 13. A pressure-resistant hose 30 having a pressure gauge 29 is provided.

Water and powder are put into the grout mixer 26, kneading is performed, the obtained mortar 13 is stored in a container (90 L) 27, and the squeeze pump 28 is operated to flow the mortar 13 from the inlet 15 at a flow rate of 15 L/min. The mortar 13 that has flowed out after the water and the air have been discharged from the upper sampling place 23 and the lower sampling place 24 is collected respectively, and the upper unit volume mass and lower part of the collected mortar 13 are collected. The unit volume mass is measured, the unit volume mass difference between the upper unit volume mass and the lower unit volume mass is determined, and the compressive strength of the upper sample and the compressive strength of the lower sample are determined.

The grout material of the present invention can be used by any method as long as it can be used as a cement mortar material in the field of modern civil engineering and construction, and particularly in the field where a pump is used, the grout material is pressure-fed over a long distance, It is useful in the construction method to be installed.
Since a pump is used in the existing inner pipe inner surface lining method for sewage pipes, it is important to have excellent pumpability and material separation resistance and fluidity of each component.

The cement used in the present invention is an essential component as a curing agent, and typical examples thereof include ordinary Portland cement, early-strength Portland cement, white cement, moderate heat Portland cement, sulfate resistant Portland cement, low heat resistance. There are Portland cements such as Portland cement and super early strength Portland cement (jet cement, super cement, SQ cement), silica cement, blast furnace cement, various mixed cements such as fly ash cement, and special cements such as alumina cement and expanded cement.
These can be used alone or as a mixture of two or more.
Cement is preferably used in the grout material powder composition of the present invention in an amount of 30 to 80% by mass, more preferably 50 to 80% by mass.

The lightweight aggregate used in the present invention is preferably blended in an amount of 6 to 165 parts by mass with respect to 100 parts by mass of cement. If it is less than 6 parts by mass, the lightness may be impaired, and if it exceeds 165 parts by mass, the compressive strength and the adhesive strength may be impaired.

The lightweight aggregate used in the present invention has the following characteristics 1. ~2. And the following characteristics 1. ~3. Artificial lightweight aggregates having The former should be compounded in an amount of 5 to 150 parts by mass relative to 100 parts by mass of cement, and the latter should be compounded in an amount of 1 to 15 parts by mass relative to 100 parts by mass of cement. Uniform dispersibility, material separation resistance of each component, pumping by pumping. It is preferable for imparting properties such as durability and durability.
(Characteristics of aggregate)
1. Bulk specific gravity: 0.1 to 0.7 g/cm ³
2. Particle size (JIS A 1102 aggregate sieving test method): 50 to 100% by mass of particles having a sieve size of less than 0.3 mm are contained.
(Characteristics of artificial lightweight aggregate)
1. Bulk specific gravity: 0.3 to 1.2 g/cm ³
2. Particle size (JIS A 1102 Aggregate sieving test method): 85 to 100% by mass of particles having a sieve size of 0.5 to 2 mm are contained.
3. Hardness (Kiya type hardness tester): 0.5-10kg
If a lightweight aggregate having such characteristics is not used, there is a possibility that a slurry with excellent fluidity that is uniformly dispersed in a short time by adding a predetermined amount of water and stirring in the field may not be obtained. ..
If the above lightweight aggregate is used, a predetermined amount of water is added and stirred at the site, so that each component can be uniformly dispersed in a short time to form a slurry having excellent fluidity and separation resistance, which is troublesome. Therefore, the cost can be reduced and a cured product having excellent strength can be obtained.

Typical examples of the lightweight aggregate used in the present invention include granular plastics such as expanded polystyrene and expanded polystyrene volume reduction products, perlite, vermiculite, shirasu balloon, fly ash balloon, and expanded glass.
These can be used alone or as a mixture of two or more.

The admixture used in the present invention is for further improving one or two or more of the adhesiveness, fluidity, separation suppression, etc. to an existing structure or other contact base material, and to 100 parts by mass of cement. It is preferable to mix 1 to 30 solids by mass.
Depending on the type of admixture, if it is less than 1 part by mass, the action and effect may not be surely exhibited, and if it exceeds 30 parts by mass, the hardening of cement may be adversely affected, so that it may not be used.

For the admixture used in the present invention, the existing pipe 1 and the strip-shaped member are continuously fed and spirally wound, and the mortar is bonded to the tubular body 8 having a profile in which the joining portions that are in contact with each other are joined by fitting. It is a component that further improves the strength, and a re-emulsified synthetic resin emulsion powder is used. Examples of the re-emulsified synthetic resin emulsion powder include acrylic type, acrylic-styrene type, SBR type, vinyl acetate type, and vinyl acetate having saponification resistance of ethylene, (meth)acrylic acid ester, versatic acid vinyl ester, etc. Various emulsions such as a modified vinyl acetate-based emulsion obtained by copolymerization of the above can be mentioned, and one or more of these emulsions can be used in combination.

The admixture used in the present invention contains a polymeric water reducing agent in order to improve the fluidity of the mortar. Examples of the polymeric water reducing agent include, for example, melamine sulfonate formaldehyde condensate, naphthalene sulfonate formaldehyde condensate, alkylnaphthalene sulfonate formaldehyde condensate, lignin sulfonate, modified lignin sulfonate system. Compound, highly condensed triazine-based condensate, polycarboxylic acid salt, polycarboxylic acid salt derivative, oxycarboxylic acid salt, oxycarboxylic acid salt derivative, aminosulfonic acid salt-based polymer compound, isoprene-based compound, polyalkylanhydrocarboxylic acid Examples thereof include acid salts, and these can be used alone or in combination of two or more.

A thickener is used in the admixture used in the present invention in order to increase the viscosity of the mortar and suppress the separation of each component in the mortar. Examples of the thickener include cellulose-based, modified starch-based protein-based, latex-based, water-soluble polymer-based, clay mineral-based, and the like, and it is possible to use one or more of these in combination. I can.

In addition, anti-bleeding agents such as holmite minerals, shrinkage reducing agents such as fly ash and gypsum, expanding agents such as calcium sulfaluminate, foaming agents such as aluminum powder and hydrogen peroxide solution, and foaming agents such as various surfactants. , Fibers such as polyvinyl alcohol fiber, carbon fiber, steel fiber, and other cement additives (materials), for example, known AE agents (air entraining agents), superplasticizers, accelerators, early-strengthening agents, quick-setting agents, retarders Agents, defoamers, water retention agents, accelerators, self-leveling agents, rust inhibitors (eg, phosphates, amines, nitrites), colorants, crack reducing agents, water-soluble polymers, etc. All can be used unless it significantly inhibits

The water inseparability-imparting mineral used in the present invention is preferably a grout material of the present invention, a smectite-based clay mineral capable of expressing thixotropic properties, a mica-based clay mineral, vermiculite, a pyrophyllite, and a holmite-based clay mineral. Further, a smectite-based clay mineral or a holmite-based clay mineral having anisotropy such that the particle shape is plate-like or linear-like is more preferable because it has a high thixotropic property imparting ability.
The grout material of the present invention, which is a smectite-based clay mineral capable of exhibiting thixotropic properties, is a typical example of particles having a plate-like shape, and can include montmorillonite, nontronite, and saponite. Bentonite is preferred. Bentonite is used to improve the viscosity and fluidity of mortar, which is composed mainly of layered silicate bentonite (a generic term for clay whose main component is montmorillonite). Bentonite is the main component as it is. And those containing organically modified bentonite as the main component. As commercially available products, "OPTIBENT987987" (trade name), "OPTIBENT1284" (trade name), "NANOTHIXB1490" (trade name) and the like manufactured by Rockwood can be used.

The smectite clay mineral is added in an amount of 5 parts by mass or less with respect to 100 parts by mass of a composition containing cement, a lightweight aggregate, and an admixture as essential components, and has a swelling power measured by the test method of 10 ml/2 g or more. The swelling amount, which is the product of the addition amount and the swelling force, is preferably 15 to 60, and even when the mortar comes into contact with the sewage at the time of filling the gap, part of the mortar is water. It can be filled with good fluidity without being separated (highly inseparable in water) due to melting.
If the addition amount is 5 parts by mass or more, the compressive strength may decrease.
If the swelling power is less than 10 ml/2 g, the inseparability in water may be poor.
If the swelling amount is less than 15, the inseparability in water may be poor.
If the amount of swelling exceeds 60, the pumpability is lowered, and if the water powder ratio is adjusted, the compressive strength may be lowered.

As a typical example of the water-separation-imparting mineral used in the present invention, the grout material of the present invention is a form of linear and fibrous formite-based clay mineral capable of expressing thixotropic properties. Examples include sepiolite, attapulgite, and palygorskite, with sepiolite being most preferred.
As for sepiolite, naturally occurring sepiolite is appropriately pulverized, or water is mixed and stirred to be defibrated to obtain a desired sepiolite. As a commercial product, Milcon (product of Showa KDE Co., Ltd.) and the like can be used.

The holmite-based clay mineral is preferably added in an amount of 1 to 3 parts by mass with respect to 100 parts by mass of a composition containing cement, a lightweight aggregate, and an admixture as an essential component, and when filling the gap, Even when the mortar comes into contact with the sewage, the mortar does not separate due to a part of the mortar dissolving into the water (high inseparability in water) and can be filled with good fluidity.
If the amount of the holmite-based clay mineral added is less than 1 part by mass, the inseparability in water may be poor.
When the amount of the holmite-based clay mineral added exceeds 3 parts by mass, the pumpability is lowered, and when the water-powder ratio is adjusted, the compressive strength may be lowered.

When a mixture of smectite clay mineral and holmite clay mineral is used, even when the mortar comes into contact with the sewage at the time of filling the gap, a part of the mortar is less likely to dissolve into water. In addition, since it does not separate (higher inseparability in water) and can be filled with better fluidity, the compounding amount of the inseparability-imparting mineral in water can be reduced, which is economical.

In the present invention, the grout material of the present invention is mixed with a predetermined amount of water, and the mixture is stirred to obtain the above-mentioned characteristics 1. It is essential to make a mortar with ~6.
The unit volume mass is 1.30 to 1.40 Kg/L. If it is less than 1.30 Kg/L, the lightweight aggregate may float and separate in sewage, and if it exceeds 1.40 Kg/L, the profile May surface.
The flow-down time is 5 to 7 seconds, and if the time is less than 5 seconds, the drawing flow value becomes large, and the lightweight aggregate may float and separate in water. If the time exceeds 7 seconds, the pumpability may decrease. ..
The withdrawal flow value is 210 to 290 mm, and if it is less than 210 mm, the pumpability may be deteriorated, and if it exceeds 290 mm, the lightweight aggregate may float in water and be separated.
The unit volume mass difference between the upper unit volume mass and the lower unit volume mass obtained in the 4 m injection test is 0.05 Kg/L or less, and when it exceeds 0.05 Kg/L, the difference in upper and lower compressive strength increases and the compressive strength is 21 N. /Mm ² may be less.
As for the inseparability in water, the amount of suspended matter is 0.80 g or less, and when it exceeds 0.80 g, the unit volume mass difference between the upper unit volume mass and the lower unit volume mass may exceed 0.05 Kg/L.
The compressive strength is 21 to 60 N/mm ² , and if it is less than 21 N/mm ² , it may be difficult to use at a construction site where strength is required such as a construction site with a large gap between the existing pipe and the lining pipe arranged inside. If it exceeds 60 N/mm ² , the unit volume mass of the mortar may exceed 1.40 Kg/L.

In the present invention, the above-mentioned characteristics 1. By using the grout material having ~6., a separate pipe is installed inside the existing pipe in which the sewage exists, and there is sewage remaining in the gap between the two, and mortar and sewage are mixed during filling. Even if the mortar and its components do not dissolve into the sewage, the sewage can be easily discharged and uniformly filled, and then cured to obtain a uniform cured product. , A composite pipe with a strength comparable to that of a new pipe can be obtained.

The above description of the embodiments is for explaining the present invention, and does not limit the invention described in the claims or reduce the scope thereof. Further, the configuration of each part of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims.

Next, the present invention will be described in detail with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples without departing from the gist of the present invention.

(Example 1-1)
The following grout material composition of the present invention was prepared by mixing 1.5 parts by mass of the following bentonite with 100 parts by mass of the composition consisting of the following cement, lightweight aggregate, artificial lightweight aggregate and admixture.
Cement: Nakamitsu Heat Portland Cement (manufactured by Taiheiyo Cement Co.): 72 parts by weight lightweight aggregate: Perlite B-04 (manufactured by Showa Chemical Industry Co., Ltd.): 19.6 parts by weight Artificial lightweight aggregate: POLASTONE S-1 (Showa KDE) ): 3 parts by mass Admixture: Sec Ace (manufactured by Showa KDE): 5.4 parts by mass Bentonite: Izumo bentonite (manufactured by Kasanen Kogyo Co., Ltd.): 1.5 parts by mass 100 parts of the grout material composition of the present invention 41 parts by mass of water was mixed with each part and kneaded with a grout mixer (OKZ-150W, Okasan Kiko Co., Ltd.) for 90 seconds to prepare a mortar.
With respect to the mortar, a unit volume mass, a withdrawal flow value, a flow-down time, an inseparability in water, a 4 m pouring test and a compressive strength test of 28 days old were carried out by the above-mentioned test method, and each was measured. The viscosity (viscosity mPa·s) of the mortar was measured by the following test method.
(Viscosity measuring method): Using a tuning fork vibration viscometer specified in JIS Z8803 "Viscosity measuring method for liquids", put 100 ml of mortar with a temperature of 20 ± 2°C in a 100 ml container, and put the viscosity detecting part of the viscometer on a horizontal plane. The viscometer was operated so that it was installed vertically, and the viscosity indicated after 1 minute was measured.
The measured results are shown in Table 1.

(Example 1-2)
5 parts by mass of Izumo bentonite (manufactured by Kasanen Kogyo Co., Ltd.) was mixed with 100 parts by mass of the composition prepared in Example 1-1 to prepare the grout material composition of the present invention, and the grout material of the present invention was prepared. The test was performed and measured in the same manner as in Example 1-1, except that 42 parts by mass of water was added to 100 parts by mass of the composition to prepare a mortar.
The measured results are shown in Table 1.

(Example 1-3)
Tenryu seal (manufactured by Kanto Bentonite Mining Co., Ltd.) was used as bentonite, and 1 part by mass was mixed with 100 parts by mass of the composition prepared in Example 1-1 to prepare a grout material composition of the present invention. The test was performed and measured in the same manner as in Example 1-1, except that 42 parts by mass of water was added to 100 parts by mass of the grout material composition of the present invention to prepare a mortar.
The measured results are shown in Table 1.

(Example 1-4)
Tenryu seal (manufactured by Kanto Bentonite Mining Co., Ltd.) was used, and 4 parts by mass was mixed with 100 parts by mass of the composition prepared in Example 1-1 to prepare the grout material composition of the present invention. The test was carried out and measured in the same manner as in Example 1-1, except that mortar was prepared by mixing 46 parts by mass of water with 100 parts by mass of the grout material composition of the present invention.
The measured results are shown in Table 1.

(Example 1-5)
As the bentonite, Super Clay (manufactured by Hojun) was used, and 1 part by mass was mixed with 100 parts by mass of the composition prepared in Example 1-1 to prepare the grout material composition of the present invention. The test was performed and measured in the same manner as in Example 1-1, except that 42 parts by mass of water was added to 100 parts by mass of the grout material composition of the present invention to prepare a mortar.
The measured results are shown in Table 1.

(Example 1-6)
The grout material composition of the present invention was prepared by mixing 2 parts by mass of Super Clay (manufactured by Hojun Co., Ltd.) with 100 parts by mass of the composition prepared in Example 1-1 to prepare the grout material of the present invention. The test was performed and measured in the same manner as in Example 1-1, except that 44 parts by mass of water was added to 100 parts by mass of the composition to prepare a mortar.
The measured results are shown in Table 1.

(Example 1-7)
As the bentonite, Kunipia F (manufactured by Kunimine Industry Co., Ltd.) was used, and 0.5 part by mass was mixed with 100 parts by mass of the composition prepared in Example 1-1 to prepare the grout material composition of the present invention. Then, the test was carried out and measured in the same manner as in Example 1-1, except that 42 parts by mass of water was added to 100 parts by mass of the grout material composition of the present invention to prepare a mortar.
The measured results are shown in Table 1.

(Example 1-8)
1 part by mass of Kunipia F (manufactured by Kunimine Industries Co., Ltd.) was mixed with 100 parts by mass of the composition prepared in Example 1-1 to prepare the grout material composition of the present invention. The test was performed and measured in the same manner as in Example 1-1, except that mortar was prepared by mixing 46 parts by mass of water with 100 parts by mass of the material composition.
The measured results are shown in Table 1.

(Comparative Example 1-1)
As in Example 1-1, except that bentonite was not mixed and 100 parts by mass of the composition prepared in Example 1-1 was mixed with 40 parts by mass of water to prepare a mortar for comparison. Then, the test was conducted and measured.
The measured results are shown in Table 2.

(Comparative Example 1-2)
As bentonite, Kasaoka bentonite (produced by Kasanen Kogyo Co., Ltd.) was used, and 3 parts by mass was mixed with 100 parts by mass of the composition prepared in Example 1-1 to prepare a grout material composition for comparison. A test was performed and measured in the same manner as in Example 1-1, except that 42 parts by mass of water was added to 100 parts by mass of the grout material composition to prepare a mortar.
The measured results are shown in Table 2.

(Comparative Example 1-3)
Izumo bentonite (manufactured by Kasanen Kogyo Co., Ltd.) was used as the bentonite, and 1 part by mass was mixed with 100 parts by mass of the composition prepared in Example 1-1 to prepare a grout material composition for comparison. A test was performed and measured in the same manner as in Example 1-1, except that 41 parts by mass of water was added to 100 parts by mass of the grout material composition to prepare a mortar.
The measured results are shown in Table 2.

(Comparative Example 1-4)
As a bentonite, a Tenryu seal (manufactured by Kanto Bentonite Mining Co., Ltd.) was used, and 6 parts by mass was mixed with 100 parts by mass of the composition prepared in Example 1-1 to prepare a grout material composition for comparison. Then, a test was performed and measured in the same manner as in Example 1-1, except that 46 parts by mass of water was added to 100 parts by mass of the grout material composition to prepare a mortar.
The measured results are shown in Table 2.

(Comparative Example 1-5)
As a bentonite, Super Clay (manufactured by Hojun Co.) was used, and 4 parts by mass was mixed with 100 parts by mass of the composition prepared in Example 1-1 to prepare a grout material composition for comparison, The test was carried out and measured in the same manner as in Example 1-1, except that mortar was prepared by mixing 46 parts by mass of water with 100 parts by mass of the grout material composition.
The measured results are shown in Table 2.

From Table 1, in Examples 1-1 to 1-8, in the unit volume mass, drawing flow value, flow-down time, inseparability in water, 4 m injection test and 28-day-old compressive strength test, the present invention was used. It turns out that it is within the prescribed range of. Therefore, even if there is sewage inside the sewage pipe and there is sewage remaining in the gap, the mortar comes into contact with the sewage, and part of the mortar begins to dissolve into the water to separate it. Instead, the sewage can be stably and uniformly filled into the gap while being discharged to the outside, so that if the mortar filled in the gap is cured, a uniform cured product is obtained, and the strength is comparable to that of a new pipe. It is understood that the effect of obtaining the composite pipe can be obtained.
On the other hand, from Table 2, in the case of Comparative Examples 1-1 to 1-3, the inseparability in water and the unit volume mass difference between the upper unit volume mass and the lower unit volume mass are both outside the specified range of the present invention. In Comparative Examples 1-4 to 1-5, the compressive strength was out of the specified range of the present invention, and it was not possible to stably and uniformly fill the gap, and a uniform cured product could not be obtained.

(Example 2-1)
Using sepiolite (Milcon SP2 (manufactured by Showa KDE)), 1 part by mass was mixed with 100 parts by mass of the composition prepared in Example 1-1 to prepare the grout material composition of the present invention. Tests were conducted and measured in the same manner as in Example 1-1, except that 42 parts by mass of water was added to 100 parts by mass of the grout material composition of the present invention to prepare a mortar.
Table 3 shows the measurement results.

(Example 2-2)
2 parts by mass of sepiolite (Milcon SP2 (manufactured by Showa KDE)) was mixed with 100 parts by mass of the composition prepared in Example 1-1 to prepare a grout material composition of the present invention. The test was conducted and measured in the same manner as in Example 1-1, except that 42 parts by mass of water was added to 100 parts by mass of the grout material composition of the invention to prepare a mortar.
Table 3 shows the measurement results.

(Example 2-3)
3 parts by mass of sepiolite (Milcon SP2 (manufactured by Showa KDE)) was mixed with 100 parts by mass of the composition prepared in Example 1-1 to prepare a grout material composition of the present invention. The test was carried out and measured in the same manner as in Example 1-1, except that mortar was prepared by mixing 46 parts by mass of water with 100 parts by mass of the grout material composition of the present invention.
Table 3 shows the measurement results.

(Comparative Example 2-1)
0.5 parts by mass of sepiolite (Milcon SP2 (manufactured by Showa KDE)) was mixed with 100 parts by mass of the composition prepared in Example 1-1 to prepare a grout material composition for comparison. A test was performed and measured in the same manner as in Example 1-1, except that 40 parts by mass of water was added to 100 parts by mass of the grout material composition to prepare a mortar.
Table 4 shows the measured results.

(Comparative Example 2-2)
4 parts by mass of sepiolite (Milcon SP2 (manufactured by Showa KDE)) was mixed with 100 parts by mass of the composition prepared in Example 1-1 to prepare a grout material composition for comparison. The test was performed and measured in the same manner as in Example 1-1 except that 48 parts by mass of water was added to 100 parts by mass of the grout material composition to prepare a mortar.
Table 4 shows the measured results.

From Table 3, in Examples 2-1 to 2-3, in the unit volume mass, the withdrawal flow value, the flowing down time, the inseparability in water, the 4 m injection test and the compressive strength test of 28 days old, the present invention was used. It turns out that it is within the prescribed range of. Therefore, even if there is sewage inside the sewage pipe and there is sewage remaining in the gap, the mortar comes into contact with the sewage, and part of the mortar begins to dissolve into the water to separate it. Instead, the sewage can be stably and uniformly filled into the gap while being discharged to the outside, so that if the mortar filled in the gap is cured, a uniform cured product is obtained, and the strength is comparable to that of a new pipe. It is understood that the effect of obtaining the composite pipe can be obtained.
On the other hand, from Table 4, in the case of Comparative Example 2-1, the inseparability in water and the unit volume mass difference between the upper unit volume mass and the lower unit volume mass are both outside the specified range of the present invention, and Comparative Example 2 In the case of -2, the compressive strength is out of the specified range of the present invention, it is impossible to stably and uniformly fill the gap, and it is found that a uniform cured product cannot be obtained.

(Example 3-1)
With respect to 100 parts by mass of the composition prepared in Example 1-1, 0.5 parts by mass of Izumo bentonite (manufactured by Kasanen Kogyo Co., Ltd.) and 0.5 parts by mass of sepiolite (Milcon SP2 (manufactured by Showa KDE Co.)), Example 1-1 except that a mortar was prepared by mixing to prepare a grout material composition of the present invention and mixing 100 parts by mass of the grout material composition of the present invention with 41 parts by mass of water. The test was conducted and measured in the same manner.
Table 5 shows the measurement results.

(Example 3-2)
To 100 parts by mass of the composition prepared in Example 1-1, 1 part by mass of Tenryu Mark (manufactured by Kanto Bentonite Mining Co., Ltd.) and 0.5 part by mass of sepiolite (Milcon SP2 (manufactured by Showa KDE)) were mixed. Then, the grout material composition of the present invention was prepared, and 42 parts by mass of water was added to 100 parts by mass of the grout material composition of the present invention to prepare a mortar. Then, the test was conducted and measured.
Table 5 shows the measurement results.

(Example 3-3)
To 100 parts by mass of the composition prepared in Example 1-1, 0.5 parts by mass of Izumo bentonite (manufactured by Kasanen Kogyo Co., Ltd.) and 1 part by mass of sepiolite (Milcon SP2 (manufactured by Showa KDE)) were mixed. The grout material composition of the present invention was prepared by the same procedure as in Example 1-1, except that 41 parts by mass of water was added to 100 parts by mass of the grout material composition of the present invention to prepare a mortar. The test was conducted and measured.
Table 5 shows the measurement results.

(Example 3-4)
To 100 parts by mass of the composition prepared in Example 1-1, 1 part by mass of Tenryu Ind. (manufactured by Kanto Bentonite Mining Co., Ltd.) and 1 part by mass of sepiolite (Milcon SP2 (manufactured by Showa KDE)) were mixed. A grout material composition of the present invention was prepared, and 44 parts by mass of water was added to 100 parts by mass of the grout material composition of the present invention to prepare a mortar, in the same manner as in Example 1-1. The test was conducted and measured.
Table 5 shows the measurement results.

From Table 5, in Examples 3-1 to 3-4, in the unit volume mass, the withdrawal flow value, the flowing time, the inseparability in water, the 4 m injection test and the compressive strength test of 28 days old, the present invention was used. It turns out that it is within the prescribed range of. Therefore, even if there is sewage inside the sewage pipe and there is sewage remaining in the gap, the mortar comes into contact with the sewage, and part of the mortar begins to dissolve into the water to separate it. Instead, the sewage can be stably and uniformly filled into the gap while being discharged to the outside, so that if the mortar filled in the gap is cured, a uniform cured product is obtained, and the strength is comparable to that of a new pipe. It is understood that the effect of obtaining the composite pipe can be obtained.
Since a mixture of smectite-based clay minerals and holmite-based clay minerals was used, even when the mortar came into contact with sewage when filling the gap, it was more likely that some of the mortar would dissolve into the water. Since the amount of the mineral becomes less and does not separate (has higher inseparability in water) and can be filled with better fluidity, there is a possibility that the blending amount of the inseparability imparting mineral in water can be reduced.

(Example 4-1)
42 parts by weight of water was added to 100 parts by weight of the grout material composition of the present invention prepared in Example 1-3 to prepare a mortar, and the results were already obtained in Example 1-3. The 4m injection test conducted by connecting two fume tubes was not conducted, and the test was conducted in the same manner as in Example 1-1, except that the following 30m injection test conducted by connecting 15 fume tubes was replaced. did.
30m injection test:
Five fume tubes with an inner diameter of 350 mm and a length of 2000 mm used in the 4 m injection test device shown in FIG. 5 were connected, and an outer diameter of 330 mm and a length were set in the tube provided with an injection port and an upper sampling site and a lower sampling site. Using a 30 m injection tester in which a profile of 30500 mm is installed and a gap between the fume tube and both ends of the profile is sealed, 75 L of water is put in the gap to a height of about 10 cm from the fume tube and the profile bottom. did.
The mortar was injected at a flow rate of 25 L/min from the inlet using a squeeze pump, and the mortar flowing out from the upper sampling site and the lower sampling site was sampled as an upper sample and a lower sample, respectively, and the upper unit volume mass and The lower unit volume mass was measured, the unit volume mass difference between the upper unit volume mass and the lower unit volume mass was determined, and the compressive strength of the upper sample and the lower sample was measured.
Table 6 shows the measurement results.

From Table 6, in Example 4-1, even in the 30 m injection test performed by connecting a large number of fume tubes, the unit volume mass, the withdrawal flow value, the flow down time, the water inseparability, the 4 m injection test and the material age 28 In the daily compressive strength test, it was found that all were within the specified range of the present invention. Therefore, even if there is sewage inside the sewage pipe and there is sewage remaining in the gap, the mortar comes into contact with the sewage, and part of the mortar begins to dissolve into the water to separate it. Instead, the sewage can be stably and uniformly filled into the gap while being discharged to the outside, so that if the mortar filled in the gap is cured, a uniform cured product is obtained, and the strength is comparable to that of a new pipe. It has been clarified that the effect of obtaining the composite pipe can be obtained.

The present invention is a grout material for a sewer rehabilitation method, which is composed of a grout material composition consisting of cement, lightweight aggregate, underwater non-separation-imparting minerals and admixtures as essential components, wherein the grout The mortar obtained by adding and mixing a predetermined amount of water to the wood composition has the above-mentioned properties 1. ~6. It is a grout material for a sewer rehabilitation method characterized by comprising:
When a separate pipe is installed inside the aged sewer pipe, and when filling the gap between the two, there is sewage inside the sewer pipe, and even if there is sewage remaining in the gap, the mortar remains By contacting the sewage and causing part of the mortar to dissolve into the water, it does not separate, and the sewage can be stably and uniformly filled into the gap while being discharged to the outside. When the filled mortar is cured, a uniform cured product can be obtained, and a remarkable effect that a composite pipe having a strength comparable to that of a new pipe can be obtained,
The sewage pipe rehabilitation method grout material of the present invention is a one-piece grout material in which all the necessary components as a grout material are blended as powder and granules, and if a predetermined amount of water is added and stirred on site Since it is possible to create a mortar in which each component is uniformly dispersed in a short time and has excellent separation resistance of each component, there is no need for labor, cost is reduced, and fluidity is impaired due to measurement error. Has a remarkable effect that there is no problem such as deterioration of the strength of the cured product,
By using the grout material of the present invention, lightweight, high strength, fluidity, material separation resistance of each component, pumpability, adhesiveness, durability, chemical resistance, resistance to temperature change, sewer pipe Since it has the remarkable effect of being able to obtain an excellent cured product having the strength required in the field, it has a high industrial utility value.

1 Existing pipe 2 Manhole 3 Sewage 4 Outer winding profile drum 5 Power unit 6 Pipe making machine 7 Profile 8 Profile tubular body 9 Gap 10 Seal 11 Air/sewage drain 12 Mortar injection device 13 Mortar 14 Hardened material (reforming pipe)
15 inlet 16 underwater inseparability tester 17, 18 funnel 19 filter paper 20 beaker 21 4m injection tester 22 fume tube 23 upper sampling location 24 lower sampling location 26 grout mixer 27 container 28 squeeze pump 29 pressure gauge 30 pressure hose 30

The present invention relates to an aged grout material for a sewer pipe rehabilitation method (hereinafter, may be simply referred to as a grout material) and a sewer pipe rehabilitation method using the grout material, and more specifically, a component necessary as a grout material. Is a single-part grout material that can create a mortar with excellent fluidity in which each component is uniformly dispersed in a short time by adding a predetermined amount of water and stirring. There, in a state where sewage sewer internal dilapidated the mortar is present, at the time of filling the mortar into the gap by installing a separate pipe, sewage gap formed between them remained state, Part of the mortar melts into the sewage or the components of the mortar do not change, and the sewage can be stably and uniformly filled into the gap while being discharged to the outside. The present invention relates to a grouting material for a sewer rehabilitation method and a sewer rehabilitation method using the same, in which a cured product can be obtained after being discharged and then a uniform cured product can be obtained, and a composite pipe having a strength comparable to that of a new pipe can be obtained. ..

In the construction method, on the site, necessary components are weighed, mixed, water is added, and the mixture is stirred to create a cement-based filler slurry. It is assumed that problems such as occurrence of such a phenomenon impair fluidity and an accident such as deterioration of strength of a cured product occur.
In order to prevent floating of the lining pipe, it is preferable that the cement-based filler has a low unit volume mass, and it is necessary to inject the filler into the long and narrow gap between the existing pipe and the lining pipe arranged inside. Therefore, the property of high fluidity is also required, and if the strength of the cured product can be increased, it can be used even in construction sites with large gaps , so it is desirable to develop a cement-based filler having such properties. Was there.

By the way, as mentioned above, reinforced concrete pipes, which are sewer pipes, are also buried underground and used for an extremely long period of time. Rehabilitation of sewer pipes has become an indispensable issue for maintaining a social life because not only the function of the drainage pipe is deteriorated but also secondary damage such as road collapse is feared.
Specifically, in the SPR method, for example, after a hard vinyl chloride profile is fitted and installed in an existing corrosion-deteriorated pipe conduit, mortar (grout material) is injected into the gap between the existing pipe and the profile. Therefore, it is a rehabilitation method to be integrated as a composite pipe. Specifically, for example, since there are all cross-sectional shapes of existing pipe inner diameter 250 mm to 5000 mm, non-circular pipe culvert short side 900 mm or more, long side 6000 mm, In addition to being able to deal with it, it is required to be able to perform construction even under the common use of sewage, and the target is the rehabilitation of a pipe with a small inner diameter where people cannot enter the pipe to work.
In the construction, since the profile is installed in the existing pipe and the gap is filled with mortar, buoyancy is generated in the profile, so it is necessary to take measures to prevent levitation. In the case of a large-diameter pipe that allows people to work inside the pipe, it is easy to prevent levitation, but in a pipe with a small internal diameter that people cannot enter, buoyancy can be reduced. A mortar of a small type is required (see Patent Document 7).
A grout material to which bentonite or the like is added has also been proposed (see Patent Documents 8-10).

In addition, in the SPR method for sewer pipes, normally, while flowing sewage into the existing pipe (under common use of sewage), a profile is installed in the existing pipe and only the gaps at both ends are sealed and the mortar is placed in the gaps. Since the mortar to be filled comes into contact with the sewage remaining in the gap and is discharged while discharging, the mortar itself and its components are dissolved in the sewage during the contact with the sewage. Component changes occur, for example, mortar concentration and component changes occur in the upper and lower parts of the mortar in the flow direction and gravity direction, and there is a difference in the unit volume mass of the filled mortar described later, and thus it is uniform and stable. When the mortar filled was not able to be filled and hardened, a uniform hardened product could not be obtained, and there was a problem that the compressive strength and the like varied.

A first object of the present invention, the mortar was placed a separate tube within the sewer dilapidated, when filling a gap formed therebetween, sewage present inside the sewer, and the gap Even if there is residual sewage in the mortar, the mortar comes into contact with the sewage, and part of the mortar begins to dissolve into the sewage, so that it does not separate, and the sewage is stably discharged to the outside. Since it is possible to fill the gap uniformly, by curing the mortar filled in the gap, a uniform cured product is obtained, and a grout material for the sewer rehabilitation method that a composite pipe with a strength comparable to a new pipe can be obtained. To provide.
A second object of the present invention is to install a separate pipe inside an existing pipe in which sewage is present using the grouting material for sewage pipe rehabilitation method of the present invention, so that the sewage remaining in the gap between the two is Even if there is mortar in contact with the sewage in the gap , the mortar can be filled into the sewage without melting, and the sewage can be easily discharged, and then cured to obtain a uniform cured product. Another object of the present invention is to provide a sewer pipe rehabilitation method in which a composite pipe having a strength comparable to that of a new pipe can be obtained.

Invention 請 Motomeko 1 wherein for eliminating the problem, cement, lightweight aggregate, grout composition comprising a particulate material to smectite clay minerals and admixtures essential component as a water nondisjunction imparting mineral It is a grout material for sewage pipe rehabilitation method composed of objects,
Mortar obtained by adding and mixing a predetermined amount of water to the grout material composition has the following properties measured by the following test method. ~6. Equipped with
The added amount of the smectite clay mineral is 5 parts by mass or less (however, 0 is not included) with respect to 100 parts by mass of the grout material composition, and the swelling power measured by the following test method 7 is 10 ml/2 g or more and 20 ml. /2 g or less, and the swelling amount which is the product of the addition amount and the swelling power is 15 to 60, which is a grout material for a sewer rehabilitation method.

5.4m injection test: A 4m injection test device shown in FIG. 5 (two fume tubes with an inner diameter of 350 mm and a length of 2000 mm are connected to each other, and an outer diameter is set in an injection port and an upper sampling place and a lower sampling place. A profile having a length of 330 mm and a length of 4500 mm is installed, and a gap between the fume tube and both ends of the profile is sealed. 10 L of water is put in the gap .), and a squeeze pump is used for the mortar. Mortar was injected at a flow rate of 15 L/min, and the mortar flowing out from the upper sampling site and the lower sampling site was collected as the upper sample and the lower sample, respectively, and the upper unit volume mass and the lower unit volume mass were measured. Calculate the unit volume mass difference between the mass and the lower unit volume mass.

Invention 請 Motomeko 2 wherein, in the sewer pipe rehabilitation method for grout of claim 1 wherein the addition amount of the smectite clay mineral, 5 parts by mass or less with respect to the grout composition 100 parts by weight (provided that , 0 is not included), the swelling power measured by the following test method 7 is 10 ml/2 g or more and 15 ml/2 g or less, and the swelling amount, which is the product of the addition amount and the swelling power, is 15 to 60. ..

(Test method)
7 . It is measured according to the Japan Bentonite Industry Association standard test method JBAS-104-77 "Bentonite (powdered) swelling test method".

Invention 請 Motomeko 3 wherein, in the sewer pipe rehabilitation method for grout according to claim 1 or claim 2, wherein the water nondisjunction imparting mineral is a mixture of a smectite clay mineral and hormite clay minerals It is characterized by

請 Motomeko 4 the described invention, the properties described below were measured by the test method of the stirred by blending a predetermined amount of water to the grout composition of claim 1 to claim 3 in construction site 1. ~6. Create a mortar that has, in the presence of sewage inside the existing sewage pipe, install a separate pipe, fill the gap with the mortar in a state where sewage remains in the gap between the two, In the sewage pipe rehabilitation method, the mortar cures after the sewage is discharged and filling is completed.
(Mortar property)
1. Unit volume mass is 1.30 to 1.40 Kg/L,
2. Flow time is 5 to 7 seconds,
3. Withdrawal flow value of 210-290 mm,
4. Inseparability in water: Suspended substance amount 0.80g or less,
The unit volume mass difference between the upper unit volume mass and the lower unit volume mass obtained in the 5.4 m injection test is 0.05 Kg/L or less,
6. Compressive strength is 21 to 60 N/mm ² .

請 Motomeko 1 (and claim 2) the described invention, cement, lightweight aggregate, grout composition comprising particulate material to smectite clay minerals and admixtures essential component as a water nondisjunction imparting mineral A grout material for sewage pipe rehabilitation method consisting of
Mortar obtained by adding and mixing a predetermined amount of water to the grout material composition has the following properties measured by the following test method. ~6. Equipped with
The added amount of the smectite clay mineral is 5 parts by mass or less (however, 0 is not included) with respect to 100 parts by mass of the grout material composition, and the swelling power measured by the following test method 7 is 10 ml/2 g or more and 20 ml. /2 g or less (in the invention of claim 2, the swelling power is 10 ml/2 g or more and 15 ml/2 g or less), and the swelling amount, which is the product of the addition amount and the swelling force, is 15 to 60. It is a grout material for water pipe rehabilitation method,
When a separate pipe is installed inside the aged sewer pipe, and when filling the gap created between the two, there is sewage inside the sewer pipe, and even if there is sewage remaining in the gap , the mortar remains By contacting the sewage and causing part of the mortar to dissolve into the water, it does not separate, and the sewage can be stably and uniformly filled into the gap while being discharged to the outside. When the filled mortar is cured, a uniform cured product is obtained, and a remarkable effect is obtained that a composite pipe having a strength comparable to that of a new pipe is obtained.
In addition, the said predetermined amount of water is the said 1st property which the said mortar measured by the said test method. ~6. It means the amount of water required to prepare.
The present invention is a one-piece grout material in which all the necessary components as a grout material are blended as powder and granules, and if each component is added and stirred at the site with a predetermined amount of water, each component becomes uniform in a short time. Since it is possible to create a mortar that has excellent fluidity and resistance to separation of each component, it does not take time and costs, and the problem that fluidity is impaired due to mismeasurement and the strength of the cured product are impaired. There is a remarkable effect that there is no problem such as.

Further, the invention of claim 1 (and claim 2), wherein, when before Symbol you Hama charged into the gap, even if the contact mortar sewage, due part of the mortar Tokedasu towards the water Further, it has a further remarkable effect that it can be filled with good fluidity without separation (high inseparability in water).

Invention 請 Motomeko 3 wherein, in the sewer pipe rehabilitation method for grout according to claim 1 or claim 2, wherein the water nondisjunction imparting mineral is a mixture of a smectite clay mineral and hormite clay minerals It is characterized by
Since using a mixture of smectite clay minerals and hormite clay minerals, when you Hama charged in the gap, even if it contacts mortar sewage, and some of the mortar Tokedasu towards the water It is less and does not separate (higher inseparability in water), and because it can be packed with better fluidity, it is economical because the amount of minerals imparting inseparability in water can be reduced. Has a remarkable effect.

請 Motomeko 4 the described invention, the above properties were measured by the test method of the stirred by blending a predetermined amount of water to the grout composition of claim 1 to claim 3 in construction site 1. ~6. Create a mortar that has, in the presence of sewage inside the existing sewage pipe, install a separate pipe, fill the gap with the mortar in a state where sewage remains in the gap between the two, A sewage pipe rehabilitation method characterized in that the mortar is cured after discharging the sewage and completing filling.
If a separate pipe is installed inside the existing pipe with sewage inside, and even if there is sewage remaining in the gap between the two, the mortar will melt into the sewage while contacting the mortar with the sewage in the gap. There is a remarkable effect that the sewage can be easily discharged without being filled, and then cured to obtain a uniform cured product and a composite pipe having a strength comparable to that of a new pipe.

FIG. 5 is an explanatory diagram illustrating a 4 m injection test device.
As shown in FIG. 5, the 4 m injection test device 21 was connected to two fume tubes 22 having an inner diameter of 350 mm and a length of 2000 mm, and the upper part of the sample was collected in the fume tube 22 provided with the injection port 15 for the mortar 13. A tubular body 8 having an outer diameter of 330 mm and a length of 4500 mm, which has a location 23 and a lower sampling location 24, is installed. Seals 10 are installed in the gaps 9 at both ends of the fume pipe 22 and the tubular body 8 having the profile, and 10 L of water is put in the gaps 9. When 10 L of water is put into the gap 9, about 100 mm of water will enter from the bottom of the fume tube 22 upward to the dotted line position in the figure.
The 4 m injection test device 21 is a grout mixer (OKZ-150W, Okasan Kiko Co., Ltd.) 26 for putting water and powder and kneading to create the mortar 13, and a container (90 L) 27 for containing the created mortar 13. , A squeeze pump (Okasan Kiko Co., Ltd. OKP-15MS) 28 for injecting the mortar 13 into the gap 9 through the inlet 15 of the 4 m injecting test device 21, and a passage for the mortar 13 for injecting the mortar 13. A pressure-resistant hose 30 having a pressure gauge 29 is provided.

Water and powder are put into the grout mixer 26, kneading is performed, the obtained mortar 13 is stored in a container (90 L) 27, and the squeeze pump 28 is operated to flow the mortar 13 from the inlet 15 at a flow rate of 15 L/min. in it is implanted into the gap 9 and the upper sampling location 23 and the lower sampling location mortar 13 flowing out after discharging the water and air from 24 taken respectively, the upper unit volume weight and lower collection mortar 13 The unit volume mass is measured, the unit volume mass difference between the upper unit volume mass and the lower unit volume mass is determined, and the compressive strength of the upper sample and the compressive strength of the lower sample are determined.

The smectite clay mineral is added in an amount of 5 parts by mass or less with respect to 100 parts by mass of a composition containing cement, a lightweight aggregate, and an admixture as essential components, and has a swelling power measured by the test method of 10 ml/2 g or more. , preferably the amount of swelling is the product of the amount and swelling power is 15 to 60, when you Hama charged in the gap, even if it contacts mortar sewage, a portion of the mortar is water It can be filled with good fluidity without separation (high inseparability in water) due to melt-out toward one side.
If the addition amount is 5 parts by mass or more, the compressive strength may decrease.
If the swelling power is less than 10 ml/2 g, the inseparability in water may be poor.
If the swelling amount is less than 15, the inseparability in water may be poor.
If the swelling amount exceeds 60, the pumping property is deteriorated, and if the water powder ratio is adjusted, the compressive strength may be decreased.

Hormite clay minerals, addition amount cement, lightweight aggregate, preferably 1 to 3 parts by weight with respect to 100 parts by mass of the composition to the admixture as essential components, when you Hama charge in the gap Even when the mortar comes into contact with sewage, the mortar does not separate due to a part of the mortar dissolving into the water (high inseparability in water) and can be filled with good fluidity.
If the amount of the holmite-based clay mineral added is less than 1 part by mass, the inseparability in water may be poor.
When the amount of the holmite-based clay mineral added exceeds 3 parts by mass, the pumpability is lowered, and when the water-powder ratio is adjusted, the compressive strength may be lowered.

With a mixture of smectite clay minerals and hormite clay minerals, when you Hama charged in the gap, even if it contacts mortar sewage, Tokedasu more like a part of the mortar towards water In addition, the amount of the minerals does not separate and does not separate (higher inseparability in water), and since it can be packed with better fluidity, the compounding amount of the inseparability imparting minerals in water can be reduced, which is economical.

In the present invention, the grout material of the present invention is mixed with a predetermined amount of water, and the mixture is stirred to obtain the above-mentioned characteristics 1. It is essential to make a mortar with ~6.
The unit volume mass is 1.30 to 1.40 Kg/L. If it is less than 1.30 Kg/L, the lightweight aggregate may float and separate in sewage, and if it exceeds 1.40 Kg/L, the profile May surface.
The flow-down time is 5 to 7 seconds, and if the time is less than 5 seconds, the drawing flow value becomes large, and the lightweight aggregate may float and separate in water. If the time exceeds 7 seconds, the pumpability may decrease. ..
The withdrawal flow value is 210 to 290 mm, and if it is less than 210 mm, the pumpability may be deteriorated, and if it exceeds 290 mm, the lightweight aggregate may float in water and be separated.
The unit volume mass difference between the upper unit volume mass and the lower unit volume mass obtained in the 4 m injection test is 0.05 Kg/L or less, and when it exceeds 0.05 Kg/L, the difference in upper and lower compressive strength increases and the compressive strength is 21 N. /Mm ² may be less.
As for the inseparability in water, the amount of suspended matter is 0.80 g or less, and when it exceeds 0.80 g, the unit volume mass difference between the upper unit volume mass and the lower unit volume mass may exceed 0.05 Kg/L.
The compressive strength is 21 to 60 N/mm ² , and if it is less than 21 N/mm ² , it may be difficult to use at a construction site where strength is required such as a construction site with a large gap between the existing pipe and the lining pipe arranged inside. If it exceeds 60 N/mm ² , the unit volume mass of the mortar may exceed 1.40 Kg/L.

From Table 1, in Examples 1-1 to 1-8, in the unit volume mass, drawing flow value, flow-down time, inseparability in water, 4 m injection test and 28-day-old compressive strength test, the present invention was used. It turns out that it is within the prescribed range of. Therefore, even if sewage exists inside the sewer pipe, and even if there is sewage remaining in the gap , the mortar comes into contact with the sewage, and part of the mortar begins to melt toward the water, thus separating it. Instead, the sewage can be stably and uniformly filled into the gap while being discharged to the outside, so that if the mortar filled in the gap is cured, a uniform cured product is obtained, and the strength is comparable to that of a new pipe. It is understood that the effect of obtaining the composite pipe can be obtained.
On the other hand, from Table 2, in the case of Comparative Examples 1-1 to 1-3, the inseparability in water and the unit volume mass difference between the upper unit volume mass and the lower unit volume mass are both outside the specified range of the present invention. In Comparative Examples 1-4 to 1-5, the compressive strength was out of the specified range of the present invention, and it was not possible to stably and uniformly fill the gap, and a uniform cured product could not be obtained.

From Table 3, in Examples 2-1 to 2-3, in the unit volume mass, the withdrawal flow value, the flowing down time, the inseparability in water, the 4 m injection test and the compressive strength test of 28 days old, the present invention was used. It turns out that it is within the prescribed range of. Therefore, even if sewage exists inside the sewer pipe, and even if there is sewage remaining in the gap , the mortar comes into contact with the sewage, and part of the mortar begins to melt toward the water, thus separating it. Instead, the sewage can be stably and uniformly filled into the gap while being discharged to the outside, so that if the mortar filled in the gap is cured, a uniform cured product is obtained, and the strength is comparable to that of a new pipe. It is understood that the effect of obtaining the composite pipe can be obtained.
On the other hand, from Table 4, in the case of Comparative Example 2-1, the inseparability in water and the unit volume mass difference between the upper unit volume mass and the lower unit volume mass are both outside the specified range of the present invention, and Comparative Example 2 In the case of -2, the compressive strength is out of the specified range of the present invention, it is impossible to stably and uniformly fill the gap, and it is found that a uniform cured product cannot be obtained.

From Table 5, in Examples 3-1 to 3-4, in the unit volume mass, the withdrawal flow value, the flowing time, the inseparability in water, the 4 m injection test and the compressive strength test of 28 days old, the present invention was used. It turns out that it is within the prescribed range of. Therefore, even if sewage exists inside the sewer pipe, and even if there is sewage remaining in the gap , the mortar comes into contact with the sewage, and part of the mortar begins to melt toward the water, thus separating it. Instead, the sewage can be stably and uniformly filled into the gap while being discharged to the outside, so that if the mortar filled in the gap is cured, a uniform cured product is obtained, and the strength is comparable to that of a new pipe. It is understood that the effect of obtaining the composite pipe can be obtained.
Since using a mixture of smectite clay minerals and hormite clay minerals, when you Hama charged in the gap, even if it contacts mortar sewage, and some of the mortar Tokedasu towards the water The amount is less, does not separate (has higher water inseparability), and can be packed with better fluidity, so that the compounding amount of the water inseparability imparting mineral may be reduced.

(Example 4-1)
42 parts by weight of water was added to 100 parts by weight of the grout material composition of the present invention prepared in Example 1-3 to prepare a mortar, and the results were already obtained in Example 1-3. The 4m injection test conducted by connecting two fume tubes was not conducted, and the test was conducted in the same manner as in Example 1-1, except that the following 30m injection test conducted by connecting 15 fume tubes was replaced. did.
30m injection test:
Five fume tubes with an inner diameter of 350 mm and a length of 2000 mm used in the 4 m injection test device shown in FIG. 5 were connected, and an outer diameter of 330 mm and a length were set in the tube provided with an injection port and an upper sampling site and a lower sampling site. Using a 30 m injection tester in which a profile of 30500 mm is installed and a gap between the fume tube and both ends of the profile is sealed, 75 L of water is put in the gap to a height of about 10 cm from the fume tube and the profile bottom. did.
The mortar was injected at a flow rate of 25 L/min from the inlet using a squeeze pump, and the mortar flowing out from the upper sampling site and the lower sampling site was sampled as an upper sample and a lower sample, respectively, and the upper unit volume mass and The lower unit volume mass was measured, the unit volume mass difference between the upper unit volume mass and the lower unit volume mass was determined, and the compressive strength of the upper sample and the lower sample was measured.
Table 6 shows the measurement results.

From Table 6, in Example 4-1, even in the 30 m injection test performed by connecting a large number of fume tubes, the unit volume mass, the withdrawal flow value, the flow down time, the water inseparability, the 4 m injection test and the material age 28 In the daily compressive strength test, it was found that all were within the specified range of the present invention. Therefore, even if sewage exists inside the sewer pipe, and even if there is sewage remaining in the gap , the mortar comes into contact with the sewage, and part of the mortar begins to melt toward the water, thus separating it. Instead, the sewage can be stably and uniformly filled into the gap while being discharged to the outside, so that if the mortar filled in the gap is cured, a uniform cured product is obtained, and the strength is comparable to that of a new pipe. It has been clarified that the effect of obtaining the composite pipe can be obtained.

The present invention is a grout material for a sewer rehabilitation method, which is composed of a grout material composition consisting of cement, lightweight aggregate, underwater non-separation-imparting minerals and admixtures as essential components, wherein the grout The mortar obtained by adding and mixing a predetermined amount of water to the wood composition has the above-mentioned properties 1. ~6. It is a grout material for a sewer rehabilitation method characterized by comprising:
When a separate pipe is installed inside the aged sewer pipe, and when filling the gap created between the two, there is sewage inside the sewer pipe, and even if there is sewage remaining in the gap , the mortar remains By contacting the sewage and causing part of the mortar to dissolve into the water, it does not separate, and the sewage can be stably and uniformly filled into the gap while being discharged to the outside. When the filled mortar is cured, a uniform cured product can be obtained, and a remarkable effect that a composite pipe having a strength comparable to that of a new pipe can be obtained,
The sewage pipe rehabilitation method grout material of the present invention is a one-piece grout material in which all the necessary components as a grout material are blended as powder and granules, and if a predetermined amount of water is added and stirred on site Since it is possible to create a mortar in which each component is uniformly dispersed in a short time and has excellent separation resistance of each component, there is no need for labor, cost is reduced, and fluidity is impaired due to measurement error. Has a remarkable effect that there is no problem such as deterioration of the strength of the cured product,
By using the grout material of the present invention, lightweight, high strength, fluidity, material separation resistance of each component, pumpability, adhesiveness, durability, chemical resistance, resistance to temperature change, sewer pipe Since it has the remarkable effect of being able to obtain an excellent cured product having the strength required in the field, it has a high industrial utility value.

Claims (5)

Cement, a lightweight aggregate, an underwater non-separation imparting mineral and a grout material for a sewer rehabilitation method composed of a grout material composition consisting of a powder and granules having an admixture as an essential component,
Mortar obtained by adding and mixing a predetermined amount of water to the grout material composition has the following properties measured by the following test method. ~6. A grout material for sewage pipe rehabilitation method, characterized by being equipped with.
(Mortar property)
1. Unit volume mass is 1.30 to 1.40 Kg/L,
2. Flow time is 5 to 7 seconds,
3. Withdrawal flow value of 210-290 mm,
4. Inseparability in water: Suspended substance amount 0.80g or less,
The unit volume mass difference between the upper unit volume mass and the lower unit volume mass obtained in the 5.4 m injection test is 0.05 Kg/L or less,
6. Compressive strength is 21 to 60 N/mm ² .
(Test method)
1. Unit volume mass: According to JIS A 1116 "Unit volume mass test method for fresh concrete and test method by mass of air amount (mass method)", kneaded sample (mortar) is put in a 1 L container and measured.
2. Flow-down time: Hold the mortar with your finger to hold the outlet of the J14 funnel specified by JSCE-F541 "Method for testing the fluidity of filled mortar (draft)", fill the mortar, and remove your finger from the outlet to remove the mortar. The flow-out time (unit: second) until the mortar flow from the outlet is interrupted for the first time is measured.
3. Extraction flow value: The flow cone specified in JIS R5201-1999 "Cement physical test method" is filled with mortar, and the spread when the flow cone is pulled up vertically is measured.
4. Underwater inseparability: Using the underwater inseparability test apparatus shown in FIG. 4 installed with an inclination of 10 degrees, 300 mL of water was put into a cylindrical container A having a diameter of 80 mm and a length of 200 mm, an inner diameter of 20 mm, and a height of 500 mm. 1000 mL of mortar filled in the vinyl chloride pipe B was poured into the cylindrical container A by opening the valve C, and the extruded suspended water was collected on the filter paper at the collection place D, and the suspension collected on the filter paper was cooled to 100° C. 1 After drying for an hour, the amount of suspended solids (g) is determined.
5.4m injection test: A 4m injection test device shown in FIG. 5 (two fume tubes with an inner diameter of 350 mm and a length of 2000 mm are connected to each other, and an outer diameter is set in an injection port and an upper sampling place and a lower sampling place. A profile having a length of 330 mm and a length of 4500 mm is installed, and a gap between the fume tube and both ends of the profile is sealed. 10 L of water is put into the gap.), and the mortar is squeezed into the injection port. Mortar was injected at a flow rate of 15 L/min, and the mortar flowing out from the upper sampling site and the lower sampling site was collected as the upper sample and the lower sample, respectively, and the upper unit volume mass and the lower unit volume mass were measured. Calculate the unit volume mass difference between the mass and the lower unit volume mass.
6. The compressive strengths of the upper and lower samples are measured and determined by the following test method.
(Compressive strength):
In accordance with JSCE-G521 of the Japan Society of Civil Engineers, mortar is filled and molded in a φ50×100 mm mold, and the mold is demolded at the age of 2 days and put into a plastic bag until the age of the test material, and the temperature is 20°C ± 2°C. It is aged in a room, the material age is 28 days, and the pressure is measured using a pressure resistance tester (Maekawa Tester Co., Ltd., 1000 kN). The water inseparability imparting mineral is a smectite clay mineral, and the addition amount is 5 parts by mass or less based on 100 parts by mass of a composition containing cement, a lightweight aggregate, and an admixture as essential components, and measured by the following test method. The grout material for a sewer pipe rehabilitation method according to claim 1, wherein the swelling power is 10 ml/2 g or more, and the swelling amount, which is the product of the added amount and the swelling force, is 15 to 60.
(Test method)
1. It is measured according to the Japan Bentonite Industry Association standard test method JBAS-104-77 "Bentonite (powdered) swelling test method". The underwater non-separation imparting mineral is a holmite clay mineral, and the addition amount is 1 to 3 parts by mass with respect to 100 parts by mass of a composition containing cement, a lightweight aggregate and an admixture as essential components. The grout material for the sewer pipe rehabilitation method according to claim 1 or 2. The water-separation-imparting mineral is a mixture of a smectite-based clay mineral and a holmite-based clay mineral, and the grout material for a sewer pipe rehabilitation method according to any one of claims 1 to 3. The following properties measured at the construction site by the above-mentioned test method by mixing a predetermined amount of water with the grout material composition according to any one of claims 1 to 4 and stirring the mixture. ~6. Create a mortar that has, in a state where sewage is present inside the existing sewer pipe, install a separate pipe, fill the gap with the mortar in a state where sewage remains in the gap between the two, The sewage pipe rehabilitation method, wherein the mortar cures after the sewage is discharged and filling is completed.
(Mortar property)
1. Unit volume mass is 1.30 to 1.40 Kg/L,
2. Flow time is 5 to 7 seconds,
3. Withdrawal flow value of 210-290 mm,
4. Inseparability in water: Suspended substance amount 0.80g or less,
The unit volume mass difference between the upper unit volume mass and the lower unit volume mass obtained in the 5.4 m injection test is 0.05 Kg/L or less,
6. Compressive strength is 21 to 60 N/mm ² .

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