JP2002068819A - Back filling material of pipe liner and performing method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a back filling material which does neither heave a liner when injected nor cause a weak part on the hardened body to be formed and favorably manifests adhesive and compressive strength at the part to place concrete in contact with the hardened concrete when dividedly injected and to provide an executing method for injecting the back filling material. SOLUTION: This back filling material is obtained by mixing a main material liquid (liquid A) containing hydraulic cement excluding alumina cement with a hardening material liquid (liquid B) containing alumina cement and II type anhydrous gypsum at the specific ratio so that the total mass of the alumina cement and the II type anhydrous gypsum in the mixed liquid of liquids A and B has the specific ratio to the total mass of the hydraulic cement, the alumina cement and the II type anhydrous gypsum or the total mass of the tempered water of liquids A and B in the mixed liquid has the specific ratio to the total mass of the hydraulic cement, the alumina cement and the II type anhydrous gypsum.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cement-based backing material used for a backfilling method for pipe linings and a construction method using the same.

[0002]

2. Description of the Related Art As one of pipe lining works, a strip with a back rib is spirally wound to form a liner on the inner surface of the pipe, and grout is formed in a gap generated by the interposition of the rib between the liner and the pipe. There is a construction method to fix the liner by injecting such a material.

[0003] A cement-based backing material called grout used in this kind of construction method is a mixture of hydraulic cement and water, which is generally called cement milk. It is known to be injected. In addition, backfilling materials used for pipe lining construction include an adhesive main material such as Portland cement described in JP-A-11-105134, a lightweight aggregate such as obsidian, an expanding material, a surfactant, and a resin emulsion. There are also special mortars that incorporate such.

[0004] The conventional cement-based backfill material called grout has the following problems since it uses a material such as cement milk, for which a hardening time is not set. In the case of a soft tube made of a synthetic resin lining, the injection of the backfill material makes it easy for the soft tube to float, and it is necessary to take some means to prevent this floating, which complicates the work. . Since the curing time is not set, the material is easily separated after the injection, and the strength tends to vary and the breathing phenomenon is likely to occur. The special mortar described in Japanese Patent Application Laid-Open No. H11-105134 also has the above-mentioned problems because the curing time is not set.

Japanese Patent Publication No. 57-10058 discloses a construction method in which a curing time is set for a grout material. A cement kneading material and a soluble aluminum comprising calcium aluminate or calcium haloaluminate are mixed with anhydrous, semi-hydrated or semi-hydrated water. A cement hardening agent comprising an inorganic sulfate made of gypsum or sodium sulfate is described. The ratio of soluble aluminum to inorganic sulfate is 0.1 to 1 part by mass of soluble aluminum.
Powdered or suspended cement stiffening agent in the range of 1 to 5 parts by mass is separately pumped to cement so that the stiffening agent is in the range of 10 to 50% by mass, and then mixed and mixed. A construction method to be applied is described. Moreover, it is described that a cement to which a mixture of alumina cement and gypsum is added is already known as a rapid-hardening cement.

As described in Japanese Patent Publication No. 57-10058, rapidly hardening cement generally has strength within a short time, but has a short setting time, so that it hardens during the handling and is hardened. There is a problem that causes trouble. As a countermeasure, it is generally essential to add a setting retarder such as an organic carboxylic acid such as gluconic acid or citric acid or a salt thereof to the rapid-hardening cement in order to delay the setting effect. However, even when a setting retarder is added, its effect varies depending on the type and amount of the added setting retarder, and is further affected by various incidental conditions in the practical work such as temperature and kneading time.

That is, 12CaO.7Al ₂ O ₃ , 3CaO.A, which is calcium aluminate as a soluble aluminum or a calcium haloaluminate in which a halogen element is solid-dissolved.
l ₂ O ₃ or a suspension of cement hardener containing 11CaO ・ 7Al ₂ O ₃・ CaF ₂ will set and harden within 30 minutes at most. In this situation, during the pouring operation, a cured product may be generated in a liquid preparation tank or a pipe or a pump for pressure-feeding a hardening material liquid (hereinafter, also referred to as a liquid B), and the work may not be able to be continued.

[0008] The B time required for the construction by delaying the curing time of the B liquid
In order to ensure the stability of the solution, it is necessary to add a setting retarder such as an organic carboxylic acid such as gluconic acid or citric acid or a salt thereof when preparing the solution B. Even if added, the effect varies depending on the setting retarder and the amount added, and further, due to various incidental conditions in the implementation work such as temperature and kneading time, during the construction, unexpected setting hardening occurs before injection. There is also a problem that the liquid B cannot be pumped. In addition, the setting retarder for delaying the hardening of the liquid B needs to be dissolved in the kneading water for the liquid B in advance before kneading the cement rapidly hardened material with water to prepare the liquid B. ,
There is also a problem that the work is complicated.

In addition, B using soluble aluminum CaO.Al ₂ O ₃
The liquid does not cure for more than 3 hours, depending on the amount ratio with water when prepared, and the curing time of the liquid B when using alumina cement is about 7 hours, all of which are sufficient for implementation. Although the stability of the liquid B can be ensured, there is a problem that the compression strength of a cured body formed by mixing the main material liquid (hereinafter also referred to as liquid A) and the liquid B is low.

As a solution to this problem, as a curing agent liquid, alumina cement and type II anhydrous gypsum are used, and a type II anhydrous gypsum having a Blaine value of 3000 cm ² / g or more is added to 0.5 part by mass of alumina cement. １．５1.5 parts by mass, and the total amount of alumina cement and type II anhydrous gypsum is 20 parts by mass with respect to 100 parts by mass of hydraulic cement excluding alumina cement in the mixture of the main material liquid and the hardening material liquid. Patent 2929352 which describes use as described above.
There is an official gazette.

As described in the aforementioned Japanese Patent No. 2929352, even if the solution B is left without adding a setting retarder,
The stability after preparation is high, and the mixed liquid of the liquid A and the liquid B hardens within 15 minutes, and the unconfined compressive strength value per day of the material is 10%.
It has the property of being at least kg / cm ^{2 and} having a breathing rate of at most 20%.

[0012] However, the grout material disclosed in Japanese Patent No. 2929352 has an effect as described in this publication in a chemical solution for injecting into the ground. However, a liner formed by spirally winding a strip with ribs on the back surface of the present invention, In the case of a backfill material used in a backfill method in which a cement-based backfill material is injected into a gap created by the rib between the inner surface of the pipe and the applied inner surface, the strength development after curing and breathing are slightly increased. Need improvement.

As a method of injecting a backfill material such as grout in pipe lining work, a method of making a hole at a fine pitch above a liner closely wound on a pipe and injecting the backfill material through the hole is used. It has been known.

In Japanese Patent No. 2844359, as a method for simplifying the injection, a curved-type spacer having an overall opening is installed in parallel with the inner surface of the pipe, and a liner is formed from above. A method of injecting a backfill material into the back of the liner through a gap formed between the tube and the pipe is described. In addition, as the injection in the large diameter pipe lining construction, it is better to inject in a divided manner, for example, injecting the lower half, injecting the upper half after curing, in order to prevent the lining pipe from being crushed. Have been.

However, although it is very efficient as a method for simply injecting the backfill material, a hardening time for the backfill material is set, especially in the case of a large-diameter construction, in order to inject separately. If not, there was a problem that the injection efficiency was deteriorated over several days and the injection efficiency was adversely affected.

[0016]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cement system for injecting a gap formed by a rib between a liner formed by spirally winding a strip with a rib on the back surface and an inner surface of a pipe provided with the liner. Backfill material and a method of injecting the backfill material, wherein the backfill material is two liquids of liquid A and liquid B,
By setting the curing time, the risk of floating of the liner due to the injection of the backfill material is eliminated, and the formed cured body does not have bleeding, so there is no fragile part at the top of the cured body, and it is divided. When injected, the joint at the spliced part is also good, and by improving the compressive strength, injection of backfill material and backfill material that can prevent lifting due to the mixed solution when split injection is performed It is to provide a construction method.

The backing material of the present invention is intended to satisfy the following requirements as its performance, that is, the curing time and the breathing rate of the mixed liquid of the liquid A and the liquid B, and the compressive strength of the formed cured product. And Curing time: A mixed liquid of the liquid A and the liquid B is cured in a range of 2 minutes to 20 minutes. -Breathing rate: The breathing rate of the mixed liquid when the mixed liquid of the liquid A and the liquid B is cured is 0%. -Compressive strength of the cured product: Compressive strength of the cured product formed by mixing liquid A and liquid B when liquid A containing 200 kg of ordinary Portland cement per 200 L of liquid A is used for one hour. 5 kg / cm ² or more, and the compressive strength (final ultimate strength) after 28 days of material age is 150 kg / cm ² or more.

[0018]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, as a backfill material, a main material liquid (A) containing hydraulic cement except alumina cement has been used.
Liquid) and a hardening material liquid (liquid B) containing alumina cement and type II anhydrous gypsum in a specific ratio, setting the hardening time and initial / final strength, and hardening the main material liquid When mixed with a liquid material, the total mass of alumina cement and type II anhydrous gypsum in the mixed solution is specified with respect to the total mass of hydraulic cement excluding alumina cement, alumina cement and type II anhydrous gypsum. And the total mass of the kneading water of the main material liquid and the hardening material liquid in the mixture is the total mass of hydraulic cement excluding alumina cement, alumina cement and type II anhydrous gypsum. By mixing to a specific ratio,
A liquid mixture of the liquid A and the liquid B is cured in a range of 2 minutes to 20 minutes,
The inventor has found that a significantly better performance and efficiency can be achieved by a backfill material having an initial / final strength and no breathing and a construction method using the same, and completed the present invention.

The first invention of the present invention relates to a cement-based backing which is injected into a gap created by the rib between a liner formed by spirally winding a strip with a rib on the back side and a pipe inner surface on which the liner is provided. A backing material, wherein the backing material comprises a main material liquid containing hydraulic cement except alumina cement, and a hardening material liquid containing alumina cement and type II anhydrous gypsum. The ratio of the total mass of alumina cement and type II anhydrous gypsum to the total mass of hydraulic cement excluding alumina cement, alumina cement and type II anhydrous gypsum in the mixture of both solutions is 0.1 to 0.1.
4, and the ratio of the total mass of the kneading water to the total mass of the hydraulic cement excluding alumina cement, the alumina cement and the type II anhydrous gypsum in the mixture of the main material liquid and the hardening material liquid is 0.45. A backing material for a pipe lining, which is mixed and used so as to be 0.8 or less. ”.

The second invention of the present invention relates to a cement-based backing material between a liner formed by spirally winding a strip with a rib on the back surface and a rib formed between the liner and the inner surface of the pipe. In the backfill method of injecting, the backfill material comprises a main material liquid containing hydraulic cement except alumina cement, and a hardening material liquid containing alumina cement type II anhydrous gypsum, and the main material liquid The ratio of the total mass of alumina cement and type II anhydrous gypsum to the total mass of hydraulic cement excluding alumina cement, alumina cement and type II anhydrous gypsum in the mixture of the hardening material liquid and alumina liquid is 0.1 to 0. 4, and the total quality of the kneading water with respect to the total mass of hydraulic cement, alumina cement and type II anhydrous gypsum excluding alumina cement in a mixture of the main material liquid and the hardening material liquid. Ratio and construction method. "The gist of the back-filling material in the tube tension, characterized in that mixed and injected as is from 0.45 to 0.8 in.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below.

Main material liquid (liquid A) in backfill material of the present invention
Is obtained by kneading hydraulic cement (excluding alumina cement) with water. Hydraulic cements that can be used as the main material include:
Various portland cements such as white, blast furnace cement,
Examples thereof include mixed cements such as silica cement and fly ash cement, and these cements can be used alone or in combination of two or more.

The amount ratio of hydraulic cement in liquid A is A
The amount is 200 parts by mass or more, preferably 220 to 250 parts by mass of hydraulic cement per 200 L of liquid. If the hydraulic cement is less than 200 parts by mass, the ultimate strength is low. Also,
If the hydraulic cement is added in an amount exceeding 250 parts by mass in order to increase the strength, the viscosity increases, a load is applied to the pump, and the mixability tends to deteriorate. In this case,
A is set so that the hydraulic cement is 200 to 250 parts by mass.
A method of preparing a liquid and injecting it in proportion to the hardening material liquid, for example, injecting so that the ratio of the main material liquid to the hardening material liquid is 3: 1 can be used.

The curing material liquid (B) in the backfill material of the present invention
Liquid) is obtained by kneading the hardening material for the hydraulic cement with water. The alumina cement used as the hardening material is 1 to 5 types of alumina cement specified in JIS-R2511 "Alumina cement for refractories", or alumina cement having a quality equivalent thereto.
Of these, it is preferable to use three to four types of alumina cement or those having a quality equivalent thereto.

Alumina cement includes CaO.Al ₂ O ₃ , CaO.2
Mainly composed of calcium aluminate such as Al ₂ O ₃ and 4Ca
Calcium alumino ferrites such as O ・ Al ₂ O ₃・ FeO ₃
Calcium aluminosilicate, such as _{2CaO · Al 2 O 3 · SiO} 2 is a cement composed of compounds such as.

In the liquid B of the present invention, type II anhydrous gypsum is used together with alumina cement. The amount ratio of the alumina cement and the type II anhydrous gypsum in the liquid B is from 0.5 part by mass of the type II anhydrous gypsum to 1 part by mass of the alumina cement.
The range is 1.5 parts by mass. When the compounding ratio of the type II anhydrous gypsum to 1 part by mass of alumina cement is less than 0.5 part by mass or more than 1.5 parts by mass, the strength of the cured product mixed with the main material liquid and cured is reduced.

In solution B, gypsum other than type II anhydrous gypsum, such as gypsum α-hemihydrate, gypsum β-hemihydrate, gypsum dihydrate and type III anhydrous gypsum, is used as gypsum in combination with alumina cement. In either case, the strength of the cured product is low and the desired strength cannot be obtained. It is permissible for gypsum in a form other than type II anhydrous gypsum to be mixed as impurities into the type II anhydrous gypsum used.

The alumina cement used for preparing the solution B
Any type of wrapping bag with type II anhydrous gypsum may be used.For example, a method in which alumina cement and type II anhydrous gypsum are transported to the site in separate bags and a predetermined amount is used for preparation of solution B, or a method in which alumina cement and type II anhydrous gypsum are used in advance. And a method of mixing gypsum with a predetermined amount ratio, carrying the mixture to the site in a premix packaging bag, and using it. The latter method is preferable in consideration of the efficiency and complexity of the site.

The backfill material of the present invention is used by mixing solution A and solution B. The amount ratio of the liquid A and the liquid B is such that the total amount ratio of the alumina cement and the type II anhydrous gypsum to the total amount of the hydraulic cement, the alumina cement and the type II anhydrous gypsum in the mixed solution is 0.1. ~ 0.4, preferably 0.15 ~ 0.
Mix so as to be in the range of 3. Hydraulic cement, alumina cement and II except for alumina cement in the mixture
Alumina cement and
If the total amount ratio with the type II anhydrous gypsum is less than 0.1, the curing time and the initial / final ultimate strength of the cured product cannot be satisfied. On the other hand, if it exceeds 0.4, the initial strength of the cured product cannot be satisfied.

The backfill material of the present invention is characterized in that the main material liquid and the hardening cement are mixed with respect to the total amount of the hydraulic cement excluding the alumina cement, the alumina cement and the type II anhydrous gypsum in the mixed solution of the solution A and the solution B. The total amount ratio of the kneading water to the material liquid is 0.45 to 0.5.
8, preferably 0.5 to 0.6. If the total ratio of alumina cement and type II anhydrous gypsum to the total amount of hydraulic cement excluding alumina cement, alumina cement and type II anhydrous gypsum in the mixed solution is less than 0.45, the flow of the mixed solution The back of the liner cannot be filled sufficiently due to lack of properties. On the other hand, if it exceeds 0.8, the initial and final ultimate strength of the cured product cannot be satisfied.

In the method for applying a backfill material using the backfill material according to the present invention, the A liquid and the B liquid are mixed at the above-mentioned quantitative ratio and injected into the space on the back surface of the liner. As a method of mixing the liquid A and the liquid B at such a volume ratio, for example, when the mass of the hydraulic cement in the liquid A per 200 L is set to 200, the liquid A and the liquid B having the same volume are used. Solution A and Solution B prepared so that the total mass of alumina cement and type II anhydrous gypsum are 20 or more are individually pumped by means of a pump capable of changing the liquid sending capacity per unit time, or separately by using separate pumps.
A pressure pipe, a stirrer, a mixing chamber (in-tube mixer, pipe mixer) provided in an injection pipe, and the like, and a method of mixing them by mixing. Also, in the mixture of the main material liquid and the hardening material liquid, the total mass of the hydraulic cement excluding the alumina cement in the main material liquid, the alumina cement in the hardening material liquid and the type II anhydrous gypsum, The total mass ratio of alumina cement and type II anhydrous gypsum in the material liquid is 0.1 to 0.4, and the hydraulic cement excluding the alumina cement in the main material liquid and the alumina cement type II in the hardened material liquid Liquid A and Liquid B are mixed if the total mass ratio of the kneading water in the main material liquid and the kneading water in the hardening material liquid to the total mass of anhydrous gypsum is 0.45 to 0.8. Is not particularly limited, and the ratio may be changed.

[0032]

Next, the present invention will be described specifically with reference to examples and comparative examples. The present invention is not limited to these examples.

Examples and Comparative Examples Liquid A: 137 L of water was added to 200 kg of ordinary Portland cement (commercially available) as a hydraulic cement and kneaded to prepare a kneading capacity of 200 L. Liquid B: Gypsum with alumina cement (JIS R 2511, 3 types) as a hardening material and various Blaine values adjusted in the proportions shown in Table 1 (commercially available, except for III-type anhydrous gypsum as a first-class reagent)
After mixing, water is added and kneaded, and the kneading capacity is 2
It was prepared to be 00L.

The following items were tested using the solution A and the solution B prepared as described above. Table 1 shows the mixing ratio between hydraulic cement and water, the type and grape value of gypsum used in combination with the hardening material and the mixing ratio (mass ratio: gypsum / hardening material), the mixing formula of liquid B, and the injection of liquid A and liquid B. And the mixing ratio of the A liquid and the B liquid (mass ratio: the total amount of the hardening material and the gypsum / the total amount of the hydraulic cement amount, the alumina cement amount, and the type II anhydrous gypsum in the mixed solution).

The test items, test methods and evaluation contents are as follows:
It is as follows.・ Curing time: At a temperature of 20 ° C., the solution A and the solution B are mixed well and allowed to stand in a container, and after mixing, the time required until the contents do not move even when the container is tilted is measured. did.・ ・ ・: The curing time was in the range of 2 minutes to 20 minutes. X: The curing time was less than 2 minutes or longer than 20 minutes.

· Breathing rate: mixed liquid 5 of liquid A and liquid B
00 ml was placed in a measuring cylinder (capacity: 500 ml) and allowed to stand, the amount of breathing (Vml) during curing was measured, and the breathing rate was determined by the following formula.・ ・ ・: The breathing rate was 0%. X: The breathing rate was greater than 0%.

Compressive strength of cured product: A mixture of Liquid A and Liquid B is poured into a cylindrical mold (diameter: 5 cm × height: 10 cm), and the formed cured product is uniaxially compressed for 1 hour. Was measured. In addition, the uniaxial compressive strength of the hardened material for one hour is 5 hours.
With respect to the composition having a weight of kg / cm ² or more, the uniaxial compressive strength was measured using an Amsler universal testing machine after a material age of 28 days. ○ ・ ・ ・ The compressive strength value per hour of material age is 5kg / cm ² or more, and
The compressive strength value after a material age of 28 days was 150 kg / cm ² or more. ×: The compressive strength value for one hour of the material age was less than 5 kg / cm ² , or the compressive strength value after 28 days of the material age was less than 150 kg / cm ² .

Table 1 shows the results of the evaluation of each of the curing time, the breathing rate, and the compressive strength value of the formed cured product of the mixture of the liquid A and the liquid B in each test, and the overall evaluation. .

· Overall evaluation ・ ・ ・: All evaluation results were ○. ×: Any of the evaluation results of the curing time, the breathing rate, and the compressive strength value of the formed cured product of the mixed liquid of the liquid A and the liquid B was ×.

[0040]

[Table 1]

Experiments Nos. 1-5 show the effect of the type of gypsum used with Alumina cement in B liquid. As plaster
Gypsum other than type II anhydrous gypsum-α hemihydrate, β hemihydrate,
When the type III anhydrous and dihydrate gypsum were used, none of the strength values intended by the present invention was obtained. (Experiment No.2
~ 5)

In Experiments Nos. 6 to 11, the mixing ratio of the liquid A and the liquid B-the total mass of the hydraulic cement, the alumina cement and the type II anhydrous gypsum in the mixed solution was calculated based on the ratio of alumina cement / type II anhydrous gypsum. Shows the effect of the percentage of the total mass of. When the total mass ratio of alumina cement / type II anhydrous gypsum to the total mass of hydraulic cement, alumina cement, and type II anhydrous gypsum is less than 0.1 (Experiment No. 11), the hardening targeted by the present invention The time and strength value of the cured product could not be obtained.
On the other hand, when the ratio exceeded 0.4 (Experiment No. 8), the initial strength value of the cured product intended by the present invention could not be obtained.

In Experiment No. 12, the total mass ratio of the kneading water in the main material liquid and the kneading water in the hardening material liquid was 0 with respect to the total mass of the hydraulic cement and the alumina cement / type II anhydrous gypsum. .8, and the curing time and the strength value of the cured product aimed at by the present invention could not be obtained.

Further, a filling test was carried out using the solution A, the solution B and the mixed solution obtained under the following conditions in Table 2. -Liquid A: It was prepared by kneading ordinary Portland cement (commercially available) as a hydraulic cement and water in the composition shown in Table 2. -Liquid B: Alumina cement (JIS R 2511, 3 types) is used as a hardening material, and mixed with gypsum (commercially available, but type II anhydrous gypsum is first class) with various brane values adjusted in the ratio shown in Table 2. And kneaded by adding water, and the kneading capacity is 20
It was adjusted to be 0 L.

The following items were tested using the solution A and the solution B prepared as described above. Type / Brain value and blending ratio (mass ratio: gypsum / hardening material) of gypsum used in combination with curing material, blending and prescription of solution B, injection ratio of solution A and solution B, mixing ratio of solution A and solution B (mass ratio) : Total amount of hardener and gypsum / total amount of hydraulic cement and alumina cement in mixed solution and total amount of type II anhydrous gypsum), water powder ratio of mixed solution (hydraulic cement and alumina cement / type II anhydrous) (Total mass ratio of kneading water in the main material liquid to kneading water in the hardening material liquid) with respect to the total mass of gypsum.

The test items, test methods and evaluation contents are as follows:
It is as follows.・ Curing time: At a temperature of 20 ° C., the solution A and the solution B are mixed well and allowed to stand in a container, and after mixing, the time required until the contents do not move even when the container is tilted is measured. did.・ ・ ・: The curing time was in the range of 2 minutes to 20 minutes. X: The curing time was less than 2 minutes or longer than 20 minutes.

Filling test: The prepared liquid A and liquid B were fed into a simulated tube having a diameter of 1200 mm and a length of 1 m at the injection ratio shown in Table 2, and
Mixing using a U-shaped tube, installing a curved spacer with an overall opening in parallel on the inner surface of the tube, forming a liner from above, through the space created between the liner and the tube, The back of the liner was divided and filled eight times. After standing for one day, it was disassembled and the state of filling was visually observed.・ ・ ・: Sufficiently filled and joint surface was also good. X: Only partially filled.

Table 2 shows the test results.

[Table 2]

Experiment Nos. 13 to 16 show that the water-powder ratio of the mixed solution, that is, the total mass of hydraulic cement excluding alumina cement, alumina cement, and type II anhydrous gypsum was kneaded in the main material liquid. The effect of the total mass ratio of water and the kneading water in the curing agent liquid on the curing time and the filling property will be described. In Experiment No. 15 in which the total mass ratio of the kneading water in the main material liquid and the kneading water in the hardening material liquid was less than 0.45 with respect to the total mass of the hydraulic cement and the alumina cement / type II anhydrous gypsum, Filling was only partially possible due to too high a viscosity. In Experiment No. 16, the water-powder ratio of the mixed solution was 0.9.
3 and 0.8 or more, the curing time was shorter than 30 seconds and 2 minutes, and the resin was cured before being sufficiently filled, so that it was only partially filled.

[0050]

The present invention is used in a backfill method in which a cement-based backfill material is injected into a gap formed by the rib between a liner formed by spirally winding a strip with a rib on the back surface and the inner surface of the pipe on which the strip is provided. In the method of injecting the backfill material and the backfill material, the use of the backfill material defined in the present invention has the following effects. (1) Since the curing time of the mixture can be set to 2 to 20 minutes, the backing material cannot be sufficiently filled on the back of the liner when the curing time is less than 2 minutes. There is no possibility that the initial strength one hour after mixing the liquid and the liquid B cannot be obtained. (2) If the compressive strength of the cured product is less than 5 kg / cm ² after 1 hour of mixing the A liquid and the B liquid, the newly injected backfill material will cure due to insufficient strength when split injection is performed. easily around the back of the body, there is a possibility that push up the liner, since the back-filling material of the present invention the compressive strength of the cured body of one hour after mixing the liquids a and B may be the 5 kg / cm ² or more There is no fear of liner lifting. (3) The cured product obtained by mixing and curing the liquid A and the liquid B has a final ultimate strength of 150 kg / cm ² or more. There is no. (4) Since the formed cured body has no breathing, no fragile portion is formed on the upper part of the cured body.

Claims (2)

[Claims] 1. A cement-based backing material injected into a gap formed by a rib between a liner formed by spirally winding a strip with a rib on a back surface and an inner surface of a pipe provided with the liner. Filling material containing hydraulic cement except alumina cement, alumina cement and II
Aqueous cement and II based on the total mass of hydraulic cement, alumina cement and type II anhydrous gypsum, excluding alumina cement, in the mixture of the main material liquid and the hardening material liquid Hydraulic cement, alumina cement and type II anhydrous gypsum in which the ratio of the total mass of the type anhydrous gypsum is 0.1 to 0.4, and the main material liquid and the hardening material liquid are both in the mixture of the two liquids except alumina cement Ratio of the total mass of kneading water to the total mass of 0.45 to 0.5.
8. A backing material for a pipe lining, which is mixed and used as in item 8. 2. A backfill method in which a cement-based backfill material is injected into a gap created by the rib between a liner formed by spirally winding a strip with ribs on the back surface and an inner surface of a pipe provided with the liner. The backfill material is composed of a main material liquid containing hydraulic cement excluding alumina cement and a hardening material liquid containing alumina cement II type anhydrous gypsum, and the main material liquid and the hardening material liquid are mixed. Hydraulic cement except alumina cement in the mixture liquid, the ratio of the total mass of alumina cement and type II anhydrous gypsum to the total mass of alumina cement and type II anhydrous gypsum is 0.1 to 0.4, and the main material liquid The ratio of the total mass of the kneading water to the total mass of the hydraulic cement, the alumina cement and the type II anhydrous gypsum excluding the alumina cement in the mixture of the hardening material liquid and the two liquids is 0.45 to 0.8. Back-filling material method construction of pipe tension, which comprises injecting and mixing a certain way.