JP6837256B2 - Grout material for sewage pipe rehabilitation method and sewage pipe rehabilitation method using it - Google Patents

Description

The present invention relates to an aged mortar material for a sewage pipe rehabilitation method (hereinafter, may be simply referred to as a mortar material) and a sewage pipe rehabilitation method using the same. Is a one-material type mortar 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, Since a part of the mortar does not dissolve toward the sewage or the components of the mortar do not change, and the sewage can be stably and uniformly filled in the gap while being discharged to the outside, the mortar fills the sewage. It relates to a mortar material for sewage pipe rehabilitation method and a sewage pipe rehabilitation method using it, in which a uniform cured product can be obtained and a composite pipe with strength comparable to that of a new pipe can be obtained by curing after discharging. ..

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 they are inevitably deteriorated. Therefore, in order to rehabilitate an existing pipe that has deteriorated due to cracks or corrosion, the inside of the existing pipe may be lined. As one of the methods for lining an existing pipe, a method of arranging another new pipe (hereinafter, may be referred to as a lining pipe or a profile) in the existing pipe is known.

That is, in the conventional method of lining in a pipe, a device called a pipe making machine is carried into an existing pipe, a strip-shaped member is supplied to the pipe making machine, and a strip-shaped member is wound in the existing pipe to make a new lining pipe. Will be molded. 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, and not only the position of the lining pipe becomes unstable, but also the pressure such as water flowing through the lining pipe cannot be applied to the existing pipe, and the lining pipe cannot be burdened. The strength cannot be secured.

Therefore, in order to secure the strength of the lining pipe placed inside, from a cement-based filler in which the necessary components are mixed between the inner surface of the existing pipe and the outer surface of the newly installed lining pipe using a backfill material injection device. The backfilling 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 the old pipe can be restored to a strength comparable to that of a new pipe. it can.

In the above method, the necessary components were weighed and mixed at the site, water was added and stirred to create a cement-based filler slurry, which caused problems such as labor and cost increase and weighing errors. It is assumed that the problem will occur and the fluidity will be impaired, and the strength of the cured product will be impaired.
In order to prevent the lining pipe from floating, a cement-based filler having a low unit volume mass is preferred, and it is necessary to inject the filler into a 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 at construction sites with large gaps . Therefore, it is desired to develop a cement-based filler having such characteristics. Was there.

By the way, as mentioned above, the reinforced concrete pipe, which is a sewer pipe, is also buried underground and used for an extremely long period of time. Rehabilitation of sewerage pipes has become an indispensable issue for maintaining social life, because not only the function as a pipe is reduced but also secondary damage such as road collapse is a concern.
Specifically, in the SPR method, for example, after fitting and installing a profile made of rigid vinyl chloride in an existing pipe that has deteriorated due to corrosion, mortar (grout material) is injected into the gap between the existing pipe and the profile. This is a rehabilitation method that integrates as a composite pipe. Specifically, for example, there are all cross-sectional shapes of existing pipes with an inner diameter of 250 mm to 5000 mm, a non-circular pipe with a short side of 900 mm or more, and a long side of 6000 mm. It is required to be able to handle it and to be able to construct it even under the common use of sewage, and the rehabilitation of a pipe with a small inner diameter that cannot be worked by people inside the pipe is also targeted.
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 take measures to prevent levitation, but in the case of a pipe with a small inner diameter that people cannot enter, the unit volume mass that can reduce buoyancy. A small type of mortar 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 the common use of sewage), a profile is attached in the existing pipe, only the gaps at both ends are sealed, and mortar is used in the gaps. The mortar to be filled comes into contact with the sewage remaining in the gap and is filled while discharging the sewage. Therefore, the mortar itself and its components dissolve into the sewage during the contact with the sewage. Component changes occur, for example, changes in mortar concentration and components occur in the upper and lower parts in the flow direction and gravity direction of the mortar, and there is a difference in the unit volume mass described later of the filled mortar, so that it is uniform and stable. When filling was not possible and the filled mortar was cured, there was a problem that a uniform cured product could not be obtained and the compression strength and the like varied.

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

A first object of the present invention is that when a separate pipe is installed inside an aged sewer pipe to fill the gap formed between the mortar, sewage is present inside the sewer pipe, and the gap is formed. Even if there is sewage remaining in the sewage, the mortar comes into contact with the sewage and a part of the mortar dissolves toward the sewage, so that the mortar does not separate and is stably discharged to the outside. Since the gap can be uniformly filled, if the mortar filled in the gap is cured, a uniform cured product can be obtained, and a composite pipe having a strength comparable to that of 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 exists by using the mortar material for the sewage pipe rehabilitation method of the present invention, and the sewage remaining in the gap generated between the two is removed. Even if there is, the mortar can be easily discharged by filling the gap with the mortar in contact with the sewage without the mortar dissolving toward the sewage, and then the sewage is cured to obtain a uniform cured product. It is to provide a sewage 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 diligent research to solve the above problems, the inventors have made a predetermined amount of water in a grout composition composed of cement, a lightweight aggregate, a mineral that imparts inseparability in water, and an admixture as essential components. The unit volume mass, flow time, withdrawal flow value, inseparability in water, unit volume mass difference between the upper unit volume mass and the lower unit volume mass obtained in the 4 m injection test, compression strength, etc. are specified for the mortar in which It has been found that the above-mentioned problems can be solved by using a grout material composition having a value of, and the present invention has been achieved.

In order to solve the above problems, the present invention rehabilitates a sewage pipe composed of a grout composition composed of cement, a lightweight aggregate, sepiolite as an inseparable mineral in water, and a powder or granular material containing an admixture as an essential component. It is a grout material for construction methods,
The 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 the sewage pipe rehabilitation method, which is characterized by being equipped with.

(Mortar properties)
1. 1. Unit volume mass is 1.30 to 1.40 kg / L,
2. 2. Flow time 5-7 seconds,
3. 3. Pull-out flow value is 210-290 mm,
4. Inseparable in water: Suspended substance amount is 0.80 g 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. Compression strength is 21-60N / mm ² .

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

2. 2. Flow time: JSCE standard JSCE-F541 "Fluidity test method for filled mortar (draft)" stipulates that _{the outlet of the J 14} funnel is pressed with a finger to fill the mortar, and the mortar is released from the outlet. The flow time (unit: seconds) until the mortar flow from the outlet is interrupted for the first time is measured.

3. 3. Pull-out flow value: The flow cone specified in JIS R5201-1999 "Physical test method for cement" is filled with mortar, and the spread when the flow cone is pulled up vertically is measured.

4. Inseparability in water: Using the underwater inseparability test device shown in FIG. 4 installed at an inclination of 10 degrees, 300 mL of water was placed in a cylindrical container A having a diameter of 80 mm and a length of 200 mm, and an inner diameter of 20 mm and a height of 500 mm. 1000 mL of mortar filled in the PVC pipe B of No. 1 was poured into the cylindrical container A by opening the valve C, the extruded suspended water was collected on the filter paper at the collection place D, and the suspension collected on the filter paper was collected at 100 ° C. 1 The amount of suspended substance (g) dried for hours is determined.

5.4m injection test: The 4m injection test device shown in Fig. 5 (two Hume pipes with an inner diameter of 350 mm and a length of 2000 mm are connected, and the outer diameter is inside the pipe provided with the injection port, the upper sampling location, and the lower sampling location. A profile of 330 mm and a length of 4500 mm is installed, and the gap between the hume pipe and both ends of the profile is sealed. Using 10 L of water in the gap ), the mortar is injected using a squeeze pump. Inject at a flow rate of 15 L / min, collect the mortar flowing out from the upper sampling place and the lower sampling place as the upper sample and the lower sample, respectively, measure the upper unit volume mass and the lower unit volume mass, and measure the upper unit volume mass. Find the unit volume mass difference between the mass and the lower unit volume mass.

6. The compression strength of the upper sample and the lower sample is measured and obtained by the following test method (compression strength):
According to the Japan Society of Civil Engineers standard JSCE-G521, mortar is filled and molded in a mold of φ50 x 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 cured indoors, the age of the material is 28 days, and the measurement is performed using a pressure resistance tester (Maekawa Testing Machine Mfg. Co., Ltd. 1000 kN).

The present invention, in the sewer pipe rehabilitation method for grout, the amount of the sepiolite cement, lightweight aggregate, is from 1 to 3 parts by weight with respect to grout composition 100 parts by weight to the admixture essential components It is characterized by that. Further, in the present invention, it is more preferable that the amount of the sepiolite added is 2 to 3 parts by mass with respect to 100 parts by mass of the grout material composition.

The present invention, in the sewer pipe rehabilitation method for grout, characterized in that the water nondisjunction imparting mineral is a mixture of a smectite clay mineral and sepiolite.

The present invention, properties of the following 1 was stirred by blending a predetermined amount of water to the grout composition in construction sites was measured by test method described above. ~ 6. A separate pipe is installed in a state where sewage exists inside the existing sewage pipe, and the mortar is filled in the gap with sewage remaining in the gap generated between the two. This is a sewage pipe rehabilitation method, characterized in that the mortar drains the sewage and hardens after filling.
(Mortar properties)
1. 1. Unit volume mass is 1.30 to 1.40 kg / L,
2. 2. Flow time 5-7 seconds,
3. 3. Pull-out flow value is 210-290 mm,
4. Inseparable in water: Suspended substance amount is 0.80 g 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. Compression strength is 21-60N / mm ² .

The present invention is a grout material for a sewage pipe rehabilitation method, which comprises a grout material composition composed of cement, a lightweight aggregate, sepiolite as an inseparable mineral in water, and a powder or granular material containing an admixture as an essential component. ,
The above-mentioned properties of a mortar obtained by adding and mixing a predetermined amount of water to the grout material composition as measured by the above-mentioned test method. ~ 6. It is a grout material for the sewage pipe rehabilitation method, which is characterized by being equipped with.
When a separate pipe is installed inside an aged sewer pipe and the gap created between the two is filled, the mortar is used even if there is sewage inside the sewer pipe and there is sewage remaining in the gap. The mortar does not separate due to contact with the sewage and a part of the mortar dissolves toward the water, and the sewage can be stably and uniformly filled in the gap while being discharged to the outside. When the filled mortar is hardened, a uniform cured product can be obtained, and a remarkable effect of obtaining a composite pipe having a strength comparable to that of a new pipe can be obtained.
The predetermined amount of water refers to the above-mentioned properties of the mortar measured by the above-mentioned test method. ~ 6. It means the amount of water required to prepare.
The present invention is a one-material type grout material in which all the components necessary for a grout material are blended as powders and granules, and if a predetermined amount of water is added and stirred at the site, each component becomes uniform in a short time. Since it is possible to create a mortar having excellent dispersed fluidity and separation resistance of each component, it is not troublesome, the cost is reduced, the fluidity is impaired due to a weighing error, and the strength of the cured product is impaired. It has a remarkable effect that there are no problems such as.

In the grout material of the present invention, if a predetermined amount of water is added and stirred, a mortar having excellent fluidity in which each component is uniformly dispersed in a short time and separation resistance of each component can be obtained.

By using the grout material of the present invention, it is excellent in light weight, high strength, fluidity, material separation resistance of each component, pumping property, adhesiveness, durability, chemical resistance, temperature change resistance, and drainage pipe. An excellent cured product having the strength required in the field can be obtained.

The present invention, in the sewer pipe rehabilitation method for grout, addition amount a cement of the sepiolite, lightweight aggregate, 1-3 parts by weight with respect to grout composition 100 parts by weight to the admixture essential components (more It is preferably 2 to 3 parts by mass with respect to 100 parts by mass of the grout material composition) .
Even if the mortar comes into contact with sewage when filling the gap, it does not separate (high inseparability in water) because a part of the mortar dissolves toward the water and provides good fluidity. It has a further remarkable effect that it can be held and filled.

The present invention, in the sewer pipe rehabilitation method for grout, which is characterized in that the water nondisjunction imparting mineral is a mixture of a smectite clay mineral and sepiolite,
Since a mixture of smectite clay mineral and sepiolite was used, even if the mortar comes into contact with the sewage when filling the gap, part of the mortar will be less likely to dissolve into the water and separate. Since it can be filled with better fluidity in addition to being non-separable (higher inseparability in water), the amount of minerals imparting inseparability in water can be reduced, which has the further remarkable effect of being economical. ..

In the present invention, the above-mentioned properties measured by the above-mentioned test method by mixing a predetermined amount of water with the above-mentioned grout material composition and stirring at the construction site. ~ 6. A separate pipe is installed in a state where sewage exists inside the existing sewage pipe, and the mortar is filled in the gap with sewage remaining in the gap generated between the two. It is a sewage pipe rehabilitation method characterized in that the mortar drains the sewage and hardens after filling.
A separate pipe is installed inside the existing pipe where sewage exists inside, and even if there is sewage remaining in the gap between the two, the mortar dissolves toward the sewage while bringing the mortar into contact with the sewage in the gap. The sewage can be easily discharged by filling it without draining, and then cured to obtain a uniform cured product, which has a remarkable effect of obtaining a composite pipe having a strength comparable to that of a new pipe.

(A) to (D) are explanatory views explaining an example of the sewage pipe rehabilitation method of the present invention. FIG. 2 is an enlarged explanatory view of a part of FIG. 1 (b). FIG. 3 is an enlarged explanatory view of one part of FIG. 1 (c). FIG. 4 is an explanatory diagram illustrating an underwater inseparability test apparatus. FIG. 5 is an explanatory diagram illustrating a 4 m injection test apparatus.

Next, embodiments of the present invention will be described in detail.
1 (a) to 1 (d) are explanatory views explaining an example of the sewage pipe rehabilitation method of the present invention. FIG. 2 is an enlarged explanatory view of a part of FIG. 1 (b). FIG. 3 is an enlarged explanatory view of one part of FIG. 1 (c).
As shown in FIG. 1 (a), the existing pipe 1 is installed underground. 2 is a manhole. Sewage 3 is flowing in the existing pipe 1.
As shown in FIG. 1 (b), when the deteriorated existing pipe 1 is rehabilitated, an outer winding profile drum 4 and a pipe making machine 6 provided with a power unit 5 are used inside the existing pipe 1 at both edge ends. The profile 7 having a joint portion is continuously fed and spirally wound, and the joint portions that are in contact with each other are joined by fitting to form a tubular body 8 of the profile. Sewage 3 is flowing 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. 1 (c), while the state in which the sewage 3 flows through the tubular body 8 of the profile is maintained, seals 10 are installed and sealed in the gaps 9 at both ends of the tubular body 8 of the profile. After installing the air / sewage drain 11 at one end downstream, the backfill mortar injection machine 12 is operated to mix a predetermined amount of water with the grout material of the present invention at the site and stir to create a mortar. The prepared 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. 1 (d), after the mortar 13 is completely filled in the gap 9 between the existing pipe 1 and the tubular body 8 of the profile, it is cured to obtain a cured product (rehabilitation pipe 14). it can.

In FIGS. 2 and 3, the same reference numerals as those in FIG. 1 indicate the same as those described in the above description of FIG. Reference numeral 15 in FIGS. 2 and 3 is an inlet for the mortar 13. In FIGS. 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 becomes as small as possible and the resistance is low. It was done to make it. In some cases, the upper gap 9 and the lower gap 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 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 old existing pipe 1 can be restored to a strength comparable to that of the new pipe. ..

FIG. 4 is an explanatory diagram illustrating an underwater inseparability test apparatus.
As shown in FIG. 4, in the underwater inseparability test apparatus 16, a cylindrical container A having a diameter of 80 mm and a length of 200 mm is installed at 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, in which a funnel 17 is installed at the upper end, is vertically connected to the portion via a valve C, and a sample is collected at the other end of the cylindrical container A. A collection place D is provided.

300 mL of water is put into the cylindrical container A, 1000 mL of mortar filled in the PVC pipe B is poured into the cylindrical container A by opening the valve C, and the extruded suspended water is put into the funnel 18 installed on the upper part of the beaker 20 at the sampling place D. It is collected on the set filter paper 19, and the residue collected on the filter paper 19 is dried at 100 ° C. for 1 hour in a dryer (not shown), and after drying, the dry mass (g) including the filter paper 19 is determined. The amount of suspended substance (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 apparatus.
As shown in FIG. 5, the 4 m injection test apparatus 21 is connected to two Hume pipes 22 having an inner diameter of 350 mm and a length of 2000 mm, and an upper sample is taken in the Hume pipe 22 provided with the injection port 15 of the mortar 13. A tubular body 8 having a profile with an outer diameter of 330 mm and a length of 4500 mm is installed, which comprises a place 23 and a lower sampling place 24. The gaps 9 at both ends of the hume pipe 22 and the tubular body 8 of the profile are sealed, and a seal 10 is installed, and 10 L of water is put in the gap 9. When 10 L of water is put into the gap 9, water is put in about 100 mm upward from the bottom of the Hume pipe 22 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 adding water and powder and kneading to prepare a mortar 13, and a container (90 L) 27 for accommodating the prepared mortar 13. , Squeeze pump (OKP-15MS, Okasan Kiko Co., Ltd.) 28 for injecting the mortar 13 into the gap 9 through the injection port 15 of the 4 m injection test device 21, and a passage of the mortar 13 for injecting the mortar 13. A pressure-resistant hose 30 having a pressure gauge 29 is provided.

Water and powder were put into the grout mixer 26 and kneaded, and the obtained mortar 13 was housed in a container (90 L) 27, and the squeeze pump 28 was operated to flow the mortar 13 from the injection port 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 obtained, and the compressive strength of the upper sample and the compressive strength of the lower sample are obtained.

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. It is useful in the construction method to be installed.
Since the lining method for the inner peripheral surface of the existing pipe of the sewage pipe uses a pump, it is important that the material separation resistance and fluidity of each component are excellent as well as the pumping property.

The cement used in the present invention is an essential component as a hardening demonstrating material, and typical examples include ordinary Portorand cement, early-strength Portorand cement, white cement, moderate heat Portorand cement, sulfate-resistant Portorand cement, and low heat. There are various types of cement such as Portland cement, ultra-fast-strength Portland cement (jet cement, super cement, SQ cement), silica cement, blast furnace cement, fly ash cement, and special cement such as alumina cement and expansion cement.
These can be used alone or in admixture of two or more.
The cement is preferably used in the grout powder / granular material composition of the present invention in an amount of preferably 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. Aggregate with and the following characteristics 1. ~ 3. An artificial lightweight aggregate having the above can be preferably used. The former is blended with 5 to 150 parts by mass with respect to 100 parts by mass of cement, and the latter is blended with 1 to 15 parts by mass with respect to 100 parts by mass of cement for uniform dispersibility, material separation resistance of each component, and pump pumping. It is preferable to impart properties such as property and durability.
(Characteristics of aggregate)
1. 1. Bulk specific gravity: 0.1 to 0.7 g / cm ³
2. 2. Particle size (JIS A 1102 aggregate sieving test method): Contains 50 to 100% by mass of particles having a sieve size of less than 0.3 mm.
(Characteristics of artificial lightweight aggregate)
1. 1. Bulk specific gravity: 0.3-1.2 g / cm ³
2. 2. Particle size (JIS A 1102 aggregate sieving test method): Contains 85 to 100% by mass of particles having a sieve size in the range of 0.5 to 2 mm.
3. 3. Hardness (Kiya type hardness tester): 0.5 to 10 kg
If a lightweight aggregate having such characteristics is not used, a predetermined amount of water may be added and stirred at the site to obtain a slurry having excellent fluidity that is uniformly dispersed in a short time. ..
If the lightweight aggregate is used, when a predetermined amount of water is added and stirred at the site, it is possible to prepare a slurry having excellent fluidity and separation resistance in which each component is uniformly dispersed in a short time, which is troublesome. Therefore, it is possible to reduce the cost and obtain a cured product having excellent strength.

Typical examples of the lightweight aggregate used in the present invention include granular plastics such as expanded polystyrene and expanded polystyrene volume-reduced products, pearlite, vermiculite, shirasu balloons, fly ash balloons, and expanded glass.
These can be used alone or in admixture of two or more.

The admixture used in the present invention is for further improving one or more of the adhesiveness, fluidity, separation suppression, etc. to the existing structure and other contact base materials, with respect to 100 parts by mass of cement. It is preferable to add 1 to 30 parts by mass of solid content.
Although it depends on the type of admixture, if it is less than 1 part by mass, the action and effect may not be exhibited reliably, and if it exceeds 30 parts by mass, it adversely affects the hardening of cement, so that it may not be used.

In the admixture used in the present invention, the existing pipe 1 and the strip-shaped member are continuously fed and spirally wound, and the tubular body 8 having a profile in which the mating joints are joined by fitting is bonded to the mortar. 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, for example, acrylic, acrylic-styrene, SBR, vinyl acetate, and vinyl acetate with ethylene, (meth) acrylic acid ester, and versatic acid vinyl ester. Various emulsions such as modified vinyl acetate-based emulsions improved by copolymerizing the above can be mentioned, and one or more of these emulsions can be used in combination.

As the admixture used in the present invention, a polymer water reducing agent is used in order to improve the fluidity of the mortar. Examples of polymer water reducing agents include formaldehyde condensates of melamine sulfonates, formaldehyde condensates of naphthalene sulfonates, formaldehyde condensates of alkylnaphthalene sulfonates, lignin sulfonates, and modified lignin sulfonates. Compounds, highly condensed triazine-based condensates, polycarboxylates, polycarboxylate-based derivatives, oxycarboxylates, oxycarboxylate-based derivatives, aminosulfonate-based polymer compounds, isoprene-based compounds, polyalkyl anhydrous carboxylics Examples thereof include acid salts, and one or more of these can be used in combination.

As the admixture used in the present invention, a thickener is used in order to increase the viscosity of the mortar and suppress the separation of each component in the mortar. Examples of thickeners include cellulose-based, modified starch-based protein-based, latex-based, water-soluble polymer-based, clay mineral-based, and the like, and one or more of these may be used in combination. You can.

In addition, bleeding inhibitors such as formite minerals, shrinkage reducing agents such as fly ash and plaster, swelling agents such as calcium sulfolaminate, foaming agents such as aluminum powder and hydrogen peroxide solution, and foaming agents such as various surfactants. , Polyvinyl alcohol fiber, carbon fiber, fiber such as steel fiber, other cement additives (materials), such as known AE agents (air entrainment agents), fluidizers, accelerators, fast-strengthening agents, quick-setting agents, delays. Advantages of the present invention such as agents, antifoaming agents, water retention agents, accelerators, self-leveling agents, rust preventives (for example, phosphates, amines, nitrites), colorants, crack reducers, water-soluble polymers, etc. All can be used as long as it does not significantly inhibit.

As the inseparable mineral in water used in the present invention, smectite-based clay minerals, mica-based clay minerals, vermiculite, pyrophyllite, and formite-based clay minerals capable of exhibiting thixotropic properties in the grout material of the present invention are preferable. Further, smectite-based clay minerals or formite-based clay minerals having anisotropy such as a plate-like or linear particle shape are more preferable because they have a high ability to impart thixotropic properties.
Montmorillonite, nontronite, and saponite can be mentioned as typical examples of smectite-based clay minerals capable of expressing thixotropy in the grout material of the present invention and having a plate-like particle shape. Bentonite is preferred. Bentonite is mainly composed of bentonite (a general term for clay containing montmorillonite as the main component), which is a layered silicate as the main component, and is used to improve the viscosity and fluidity of mortar. Bentonite is the main component as it is. And those with organically modified bentonite as the main component. On the market, Rockwood's "OPTIBENT 987987" (trade name),
"OPTIBENT 1284" (product name), "NANOTHIX B1490" (product name), etc. can be used.

The amount of smectite clay mineral added is 5 parts by mass or less with respect to 100 parts by mass of the composition containing cement, lightweight aggregate, and admixture as essential components, and the swelling power measured by the above test method is 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 By dissolving in the direction, it does not separate (high inseparability in water) and can be filled with good fluidity.
If the amount added 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 inferior.
If the amount of swelling is less than 15, the inseparability in water may be inferior.
If the amount of swelling exceeds 60, the pumping property is lowered, and if the water powder ratio is adjusted, the compressive strength may be lowered.

As a typical example of the underwater inseparable mineral used in the present invention, the grout material of the present invention is a formite-based clay mineral having a linear or fibrous particle shape capable of exhibiting thixotropy. Sepiolite, Atapargite, Palygorskite can be mentioned, with Sepiolite being the most preferred.
Sepiolite is obtained by appropriately pulverizing naturally occurring sepiolite or defibrating it by mixing and stirring with water to obtain the desired sepiolite. As a commercially available product, Milcon (Showa KDE Co., Ltd. product) or the like can be used.

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 if the mortar comes into contact with sewage, a part of the mortar dissolves toward the water, so that the mortar does not separate (high inseparability in water) and can be filled with good fluidity.
If the amount of formalite-based clay mineral added is less than 1 part by mass, the inseparability in water may be inferior.
If the amount of the formalite-based clay mineral added exceeds 3 parts by mass, the pumping property is lowered, and if 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 Since it is reduced, does not separate (higher inseparability in water), and can be filled with better fluidity, the amount of the mineral that imparts inseparability 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 stirred to achieve the above-mentioned characteristics. It is important to make a mortar having ~ 6.
The unit volume mass is 1.30 to 1.40 kg / L, and if it is less than 1.30 kg / L, the lightweight aggregate may float and separate in the sewage, and if it exceeds 1.40 kg / L, the profile May surface.
The flow time is 5 to 7 seconds, and if it is less than 5 seconds, the pull-out flow value becomes large, and the lightweight aggregate may float and separate in water, and if it exceeds 7 seconds, the pumping property may decrease. ..
The pull-out flow value is 210 to 290 mm, and if it is less than 210 mm, the pumping property may decrease, and if it exceeds 290 mm, the lightweight aggregate may float and separate in water.
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 if it exceeds 0.05 kg / L, the difference in compressive strength between the upper and lower sides becomes large and the compressive strength is 21 N. It may be less than / mm ^2.
The amount of suspended substance in water is 0.80 g or less, and if 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, a predetermined amount of water is mixed and stirred to achieve the above-mentioned characteristics 1. By using the grout material having ~ 6, a separate pipe is installed inside the existing pipe where sewage exists inside, and there is sewage remaining in the gap generated between the two, and the mortar and sewage are mixed during filling. The mortar and its components do not dissolve toward the sewage even if they come into contact with each other, and 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.

It should be noted that the description of the above-described embodiment is for explaining the present invention, and does not limit or reduce the scope of the invention described in the claims. 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 as long as the gist of the present invention is not deviated.

(Example 1-1)
The grout 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 composed of the following cement, lightweight aggregate, artificial lightweight aggregate and admixture.
Cement: Moderate heat Portland cement (manufactured by Taiheiyo Cement): 72 parts by mass Lightweight aggregate: Perlite B-04 (manufactured by Showa Chemical Industry Co., Ltd.): 19.6 parts by mass
Artificial lightweight aggregate: Polarston S-1 (manufactured by Showa KDE Co., Ltd.): 3 parts by mass Admixture: Sec Ace (manufactured by Showa KDE Co., Ltd.): 5.4 parts by mass Bentonite: Izumo bentonite (manufactured by Kasanen Kogyo Co., Ltd.): 1. 5 parts by mass
41 parts by mass of water was added to 100 parts by mass of the grout material composition of the present invention and kneaded with a grout mixer (OKZ-150W, Okasan Kiko Co., Ltd.) for 90 seconds to prepare a mortar.
The mortar was measured by the above test method by performing a unit volume mass, a withdrawal flow value, a flow time, inseparability in water, a 4 m injection test, and a compressive strength test at a material age of 28 days. Further, the viscosity (viscosity mPa · s) of the mortar was measured by the following test method.
(Viscosity measurement method): Using a sound fork vibration viscometer specified in JIS Z8803 "Method for measuring viscosity of liquid", put 100 ml of mortar at a temperature of 20 ± 2 ° C. in a 100 ml container, and place the viscosity detector of the viscometer on a horizontal surface. It was installed so as to be perpendicular to the relative position, the viscometer was operated, and the indicated value of the viscosity after 1 minute was measured.
The measurement 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 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 composition to prepare a mortar.
The measurement results are shown in Table 1.

(Example 1-3)
Using Tenryu Mark (manufactured by Kanto Bentonite Mining Co., Ltd.) as bentonite, 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 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 measurement results are shown in Table 1.

(Examples 1-4)
Using Tenryu Mark (manufactured by Kanto Bentonite Mining Co., Ltd.), 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 46 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 measurement results are shown in Table 1.

(Example 1-5)
Using Super Clay (manufactured by Hojun) as bentonite, 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 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 measurement 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) with respect to 100 parts by mass of the composition prepared in Example 1-1 to prepare the grout material of the present invention. The test was carried out 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 measurement results are shown in Table 1.

(Example 1-7)
Using Kunipia F (manufactured by Kunimine Kogyo Co., Ltd.) as bentonite, 0.5 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. Then, a 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 measurement results are shown in Table 1.

(Example 1-8)
1 part by mass of Kunipia F (manufactured by Kunimine 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 of the present invention was prepared. The test was carried out 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 material composition to prepare a mortar.
The measurement results are shown in Table 1.

(Comparative Example 1-1)
Same as Example 1-1 except that 40 parts by mass of water was added to 100 parts by mass of the composition prepared in Example 1-1 without mixing bentonite to prepare a mortar for comparison. Was tested and measured.
The measurement results are shown in Table 2.

(Comparative Example 1-2)
Kasaoka bentonite (manufactured by Kasanen Kogyo Co., Ltd.) was used as bentonite, 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. , 42 parts by mass of water was added to 100 parts by mass of this grout material composition to prepare a mortar, and the test was carried out in the same manner as in Example 1-1 for measurement.
The measurement results are shown in Table 2.

(Comparative Example 1-3)
Izumo bentonite (manufactured by Kasanen Kogyo 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 for comparison. The test was carried out 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 this grout material composition to prepare a mortar.
The measurement results are shown in Table 2.

(Comparative Example 1-4)
Using Tenryu Mark (manufactured by Kanto Bentonite Mining Co., Ltd.) as bentonite, 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, the test was carried out 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 this grout material composition to prepare a mortar.
The measurement results are shown in Table 2.

(Comparative Example 1-5)
Using super clay (manufactured by Hojun) as bentonite, 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. A test was conducted 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 this grout material composition to prepare a mortar.
The measurement results are shown in Table 2.

From Table 1, in Examples 1-1 to 1-8, the present invention was used in the unit volume mass, the withdrawal flow value, the flow time, the inseparability in water, the 4 m injection test, and the compressive strength test at a material age of 28 days. It can be seen that it is within the specified range of. Therefore, even if there is sewage inside the sewage pipe and there is sewage remaining in the gap , the mortar may come into contact with the sewage and part of the mortar may be separated toward the water. Instead, the sewage can be stably and uniformly filled in the gap while being discharged to the outside. Therefore, if the mortar filled in the gap is cured, a uniform cured product can be obtained and the strength is comparable to that of a new pipe. It can be seen that the effect of obtaining a composite tube 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 all outside the specified range of the present invention. In the cases of Comparative Examples 1-4 to 1-5, it can be seen that the compressive strength is out of the specified range of the present invention, the gap cannot be stably and uniformly filled, and a uniform cured product cannot be obtained.

(Example 2-1)
Using Sepiolite (Milcon SP2 (manufactured by Showa KDE Co., Ltd.)), 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 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 measurement results are shown in Table 3.

(Example 2-2)
Sepiolite (Milcon SP2 (manufactured by Showa KDE)) was mixed with 2 parts by mass of 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 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 measurement results are shown in Table 3.

(Example 2-3)
Sepiolite (Milcon SP2 (manufactured by Showa KDE)) was mixed with 3 parts by mass of 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 46 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 measurement results are shown in Table 3.

(Comparative Example 2-1)
Sepiolite (Milcon SP2 (manufactured by Showa KDE Co., Ltd.)) was mixed with 0.5 parts by mass with respect to 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 40 parts by mass of water was added to 100 parts by mass of this grout material composition to prepare a mortar.
The measurement results are shown in Table 4.

(Comparative Example 2-2)
Sepiolite (Milcon SP2 (manufactured by Showa KDE Co., Ltd.)) was mixed with 4 parts by mass with respect to 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 48 parts by mass of water was added to 100 parts by mass of the grout material composition to prepare a mortar.
The measurement results are shown in Table 4.

From Table 3, in Examples 2-1 to 2-3, the present invention was used in the unit volume mass, the withdrawal flow value, the flow time, the inseparability in water, the 4 m injection test, and the compressive strength test at a material age of 28 days. It can be seen that it is within the specified range of. Therefore, even if there is sewage inside the sewage pipe and there is sewage remaining in the gap , the mortar may come into contact with the sewage and part of the mortar may be separated toward the water. Instead, the sewage can be stably and uniformly filled in the gap while being discharged to the outside. Therefore, if the mortar filled in the gap is cured, a uniform cured product can be obtained and the strength is comparable to that of a new pipe. It can be seen that the effect of obtaining a composite tube 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 were both outside the specified range of the present invention, and Comparative Example 2 In the case of −2, it can be seen that the compressive strength is out of the specified range of the present invention, the gap cannot be stably and uniformly filled, and a uniform cured product cannot be obtained.

(Example 3-1)
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)) with respect to 100 parts by mass of the composition prepared in Example 1-1. The grout material composition of the present invention was prepared by mixing, and 41 parts by mass of water was mixed with 100 parts by mass of the grout material composition of the present invention to prepare a mortar. The test was conducted in the same manner and measured.
The measurement results are shown in Table 5.

(Example 3-2)
1 part by mass of Tenryu Mark (manufactured by Kanto Bentonite Mining Co., Ltd.) and 0.5 parts by mass of Sepiolite (Milcon SP2 (manufactured by Showa KDE Co., Ltd.)) are mixed with 100 parts by mass of the composition prepared in Example 1-1. The same as in Example 1-1 except that the grout material composition of the present invention was prepared and 42 parts by mass of water was mixed with 100 parts by mass of the grout material composition of the present invention to prepare a mortar. Was tested and measured.
The measurement results are shown in Table 5.

(Example 3-3)
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 with 100 parts by mass of the composition prepared in Example 1-1. The grout material composition of the present invention was prepared in the same manner as in Example 1-1 except that 41 parts by mass of water was mixed with 100 parts by mass of the grout material composition of the present invention to prepare a mortar. Tested and measured.
The measurement results are shown in Table 5.

(Example 3-4)
1 part by mass of Tenryu Mark (manufactured by Kanto Bentonite Mining Co., Ltd.) and 1 part by mass of Sepiolite (Milcon SP2 (manufactured by Showa KDE)) are mixed with 100 parts by mass of the composition prepared in Example 1-1. The same as in Example 1-1 except that the grout material composition of the present invention was prepared and 44 parts by mass of water was mixed with 100 parts by mass of the grout material composition of the present invention to prepare a mortar. A test was performed and measured.
The measurement results are shown in Table 5.

From Table 5, in Examples 3-1 to 3-4, the present invention was used in the unit volume mass, the withdrawal flow value, the flow time, the inseparability in water, the 4 m injection test, and the compressive strength test at a material age of 28 days. It can be seen that it is within the specified range of. Therefore, even if there is sewage inside the sewage pipe and there is sewage remaining in the gap , the mortar may come into contact with the sewage and part of the mortar may be separated toward the water. Instead, the sewage can be stably and uniformly filled in the gap while being discharged to the outside. Therefore, if the mortar filled in the gap is cured, a uniform cured product can be obtained and the strength is comparable to that of a new pipe. It can be seen that the effect of obtaining a composite tube 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 It is possible to reduce the amount of the mineral that imparts inseparability in water because it is less, does not separate (has higher inseparability in water), and can be filled with better fluidity.

(Example 4-1)
A mortar was prepared by blending 42 parts by mass of water with 100 parts by mass of the grout material composition of the present invention prepared in Example 1-3, and the results have already been obtained in Example 1-3. The 4m injection test performed by connecting two Hume pipes was not performed, but the test was performed and measured in the same manner as in Example 1-1 except that the test was replaced with the following 30m injection test performed by connecting 15 Hume pipes. did.
30m injection test:
Fifteen Hume pipes with an inner diameter of 350 mm and a length of 2000 mm used in the 4 m injection test apparatus shown in FIG. 5 are connected, and an outer diameter of 330 mm and a length are provided in a pipe provided with an injection port, an upper sampling place and a lower sampling place. Using a 30 m injection test device in which a profile of 30500 mm is installed and the gap between both ends of the hume pipe and the profile is sealed, 75 L of water is put into the gap to a height of about 10 cm from the bottom of the hume pipe and the profile. did.
The mortar is injected from the injection port at a flow rate of 25 L / min using a squeeze pump, and the mortar flowing out from the upper sampling place and the lower sampling place is collected as the upper sample and the lower sample, respectively, and the upper unit volume mass is used. 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.
The measurement results are shown in Table 6.

From Table 6, in Example 4-1 even in the 30 m injection test conducted by connecting a large number of Hume pipes, the unit volume mass, the withdrawal flow value, the flow time, the inseparability in water, the 4 m injection test and the material age 28 In the day's compression strength test, it was found that all of them 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 may come into contact with the sewage and part of the mortar may be separated toward the water. Instead, the sewage can be stably and uniformly filled in the gap while being discharged to the outside. Therefore, if the mortar filled in the gap is cured, a uniform cured product can be obtained and the strength is comparable to that of a new pipe. It was clarified that the effect of obtaining a composite tube can be obtained.

The present invention is a grout material for a sewage pipe rehabilitation method, which comprises a grout material composition composed of cement, a lightweight aggregate, a mineral that imparts inseparability in water, and a powder or granular material containing an admixture as an essential component. The above-mentioned properties of a mortar obtained by adding and mixing a predetermined amount of water to a material composition as measured by the above-mentioned test method. ~ 6. It is a grout material for the sewage pipe rehabilitation method, which is characterized by being equipped with.
When a separate pipe is installed inside an aged sewer pipe and the gap created between the two is filled, the mortar is used even if there is sewage inside the sewer pipe and there is sewage remaining in the gap. The mortar does not separate due to contact with the sewage and a part of the mortar dissolves toward the water, and the sewage can be stably and uniformly filled in the gap while being discharged to the outside. When the filled mortar is hardened, a uniform cured product can be obtained, and a remarkable effect of obtaining a composite pipe having a strength comparable to that of a new pipe can be obtained.
The grout material for the sewage pipe rehabilitation method of the present invention is a one-material type grout material in which all the components necessary for the grout material are blended as powders and granules, and if a predetermined amount of water is added and stirred at the 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, it is not troublesome, the cost is reduced, and the fluidity is impaired due to a weighing error. It has a remarkable effect that there is no problem such as the strength of the cured product being impaired.
By using the grout material of the present invention, it is excellent in light weight, high strength, fluidity, material separation resistance of each component, pumping property, adhesiveness, durability, chemical resistance, temperature change resistance, and drainage pipe. It has a remarkable effect of being able to obtain an excellent cured product having the strength required in the field, and therefore has 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 product (rehabilitation pipe)
15 Injection port 16 Underwater inseparability test device 17, 18 Roth 19 Filter paper 20 Beaker 21 4m injection test device 22 Hume pipe 23 Upper sampling location 24 Lower sampling location 26 Grout mixer 27 Container 28 Squeeze pump 29 Pressure gauge 30 Pressure resistant hose

Claims (3)

A grout material for sewage pipe rehabilitation method, which is composed of a grout material composition consisting of cement, a lightweight aggregate, sepiolite as an inseparable mineral in water, and a powder or granular material containing an admixture as an essential component.
The 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 a,
A grout material for a sewage pipe rehabilitation method , wherein the amount of sepiolite added is 2 to 3 parts by mass with respect to 100 parts by mass of the grout material composition.
(Mortar properties)
1. 1. Unit volume mass is 1.30 to 1.40 kg / L,
2. 2. Flow time 5-7 seconds,
3. 3. Pull-out flow value is 210-290 mm,
4. Inseparable in water: Suspended substance amount is 0.80 g 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. Compression strength is 21-60N / mm ² .
(Test method)
1. 1. Unit volume mass: According to JIS A 1116 "Unit volume mass test method for fresh concrete and test method based on the mass of air volume (mass method)", the kneaded sample (mortar) is placed in a 1 L container and measured.
2. 2. Flow time: Hold the outlet of the J14 funnel specified in JSCE-F541 "Fluidity test method (draft) of filled mortar" of the Japan Society of Civil Engineers with your finger, fill the mortar, and release your finger from the outlet to release the mortar. Measure the flow time (unit: seconds) until the mortar flow from the outlet is interrupted for the first time.
3. 3. Pull-out flow value: The flow cone specified in JIS R5201-1999 “Physical test method for cement” is filled with mortar, and the spread when the flow cone is pulled up vertically is measured.
4. Inseparability in water: Using the underwater inseparability test device shown in FIG. 4 installed at an inclination of 10 degrees, 300 mL of water was placed in a cylindrical container A having a diameter of 80 mm and a length of 200 mm, and an inner diameter of 20 mm and a height of 500 mm. 1000 mL of mortar filled in the PVC pipe B of No. 1 was poured into the cylindrical container A by opening the valve C, the extruded suspended water was collected on the filter paper at the collection place D, and the suspension collected on the filter paper was collected at 100 ° C. 1 Dry for hours and determine the amount of suspended substance (g).
5.4m injection test: The 4m injection test device shown in Fig. 5 (two Hume pipes with an inner diameter of 350 mm and a length of 2000 mm are connected, and the outer diameter is inside the pipe provided with the injection port, the upper sampling location, and the lower sampling location. A profile of 330 mm and a length of 4500 mm is installed, and the gap between the hume pipe and both ends of the profile is sealed. Using 10 L of water in the gap), the mortar is injected using a squeeze pump. Inject at a flow rate of 15 L / min, collect the mortar flowing out from the upper sampling place and the lower sampling place as the upper sample and the lower sample, respectively, measure the upper unit volume mass and the lower unit volume mass, and measure the upper unit volume mass. Find the unit volume mass difference between the mass and the lower unit volume mass.
6. The compressive strength of the upper sample and the lower sample is measured and obtained by the following test method.
(Compression strength):
According to the Japan Society of Civil Engineers standard JSCE-G521, 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 cured indoors, the age of the material is 28 days, and the measurement is performed using a pressure resistance tester (Maekawa Testing Machine Mfg. Co., Ltd. 1000 kN). The grout material for a drainage pipe rehabilitation method according to claim 1, wherein the inseparable mineral in water is a mixture of a smectite clay mineral and sepiolite. 1. The following properties measured by the above test method by mixing a predetermined amount of water with the grout material composition according to claim 1 or 2 at the construction site and stirring the mixture. ~ 6. A separate pipe is installed in a state where sewage exists inside the existing sewage pipe, and the mortar is filled in the gap with sewage remaining in the gap generated between the two. A sewage pipe rehabilitation method, characterized in that the mortar drains the sewage and hardens after filling.
(Mortar properties)
1. 1. Unit volume mass is 1.30 to 1.40 kg / L,
2. 2. Flow time 5-7 seconds,
3. 3. Pull-out flow value is 210-290 mm,
4. Inseparable in water: Suspended substance amount is 0.80 g 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. Compression strength is 21-60N / mm ² .

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