JP2008121718A - Water passage repairing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water passage repairing method using grout material (a) that gives minimum buoyancy to a new pipe. <P>SOLUTION: The grout material (a) is filled between an agricultural water tunnel water passage (a closed water passage) A and a reinforcing plastic composite pipe B inserted thereinto via filling ports 1. The grout material consists of milk a' which is formed of hardening material, kneaded water and admixture and to which the admixture as dispersant is added, and a bubble group c which is formed of diluted solution c' in which foaming agent is mixed and air c". It has a wet density of 0.5 t/m<SP>3</SP>or lower, a flow value of 140 mm or smaller, and a compression strength of 500 KN/m<SP>2</SP>or higher for a material age of 28 days, wherein air has a capacity ratio of 65% or more, the weight ratio of the kneaded water to the hardening material is 55% or less, and the weight ratio of the admixture to the hardening material is 0.1-0.5%, meaning low gravity. The grout material gives small buoyancy to the new pipe and serves for easy buoyancy preventing measures. In a construction site, the diluted solution in which the foaming agent is dissolved and air are manufactured by an bubble manufacturing device 14b, and the bubbles and the milk are kneaded by a kneading machine 14a and filled between the pipe B and the closed water passage via a filling pipe 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is to insert new pipes into a closed water channel such as an aging existing water channel tunnel or an existing pipe water channel one after another and join the new pipes to form a new pipe, and the new pipe and the existing water channel tunnel. It is related to the repair method of the water channel by the pipe-in tunnel method of filling the grout material through the inlet of the new pipe during the period, and the repair method of the water channel filling the grout material around the pipe laid in the open channel is there.

Today, when existing waterway tunnels or existing pipe waterways formed by box culverts, fume pipes, etc. have become obsolete in the past as water and sewage pipes, agricultural water pipes, etc. The water channel is renewed (renovated) by a pipe-in-tunnel method or the like that is inserted into the pipe to form a new pipe.
Hereinafter, a structure in which a cylindrical space is formed in the horizontal direction in the underground, such as an existing waterway tunnel made of box culverts, an existing pipe waterway, etc., is collectively referred to as a “closed waterway” and is arranged in the closed waterway. The pipes that are installed and the new pipes are called “new pipes”.
On the other hand, non-cylindrical water channels such as groove-shaped water channels are collectively referred to as “open water channels”.

In these repair methods, the grout material is filled between the new pipe (secondary lining pipe) and the water channel (primary lining pipe).
As one method, for example, as shown in FIGS. 6 and 7, new pipes B are sequentially inserted into an existing tunnel water channel (closed water channel) A, and the new pipes B are connected to each other through a pipe joint C. In addition, a new pipe B ′ is formed, and the grout material a is filled between the new pipe B ′ (new pipe B) and the closed water channel (existing pipe) A through the inlet of the new pipe B ( (See Patent Documents 1 and 2).
Japanese Patent Laid-Open No. 9-166242 JP-A-9-235996

As shown in FIG. 7, the filling of the grout material “a” in these refurbishing methods is performed by setting the new pipe length obtained by joining about 15 to 20 new pipes B as the filling range of the grout material “a” once. An intermediate partition wall D is formed between the new pipe B and the closed channel A at both ends of the pipe, and the grout material a is injected between the new pipe B and the closed channel A from the inlet formed in the new pipe B. ing.
Moreover, this grout material a is used also when filling the circumference | surroundings of the pipe | tube B laid in the groove | channel (open channel) H cut by the ground, and fixing the pipe | tube B to the ground (FIG. 5). reference).

As grouting materials used in these repair methods, air mortar and air milk are known, and Non-Patent Document 1 is a typical conventional blending example for the air mortar and air milk. Among these, for all blends having a uniaxial compressive strength of 500 kN / m ² or more, W / C (weight ratio of kneaded water to hardened material) is 60% or more (> 55%), and the wet density is 0.00. It exceeds 5t / m ³ .
"FCB method (lightweight embankment method using air bubbles mixed lightweight soil) Nobuo Mishima and Kimito Masumura Riko Books Co., Ltd. July 30, 2000 First edition issued"

In the filling operation of the grout material a, if the specific gravity of the grout material a increases, the buoyancy to the new pipe B also increases, and a pipe presser (support work) is provided on the new pipe B or the like. It is necessary to take measures to prevent buoyancy (lifting) such as placing a. This measure leads to cost increase.
In general, in order to reduce the specific gravity of the grout material a, it is necessary to increase the number of bubbles and decrease the curing material and the kneading water. However, generally, the curing material and the kneading water are kneaded and manufactured separately from the bubble group, and the ratio (W / C) between the curing material C and the kneading water W cannot be made very small. That is, if W / C is made small, kneading by a mixer or the like becomes insufficient, making it impossible to manufacture, and pumping pressure becomes large when pumping with a hose, making pumping difficult. Further, reducing the curing material is very effective for reducing the specific gravity of the grout material, but the strength which is the basic performance of the grout material after curing cannot be ensured.

  An object of the present invention is to minimize the buoyancy of a grout material to a new pipe while solving the above problems.

In order to solve the above-described problem, the water channel repair method of the present invention is to insert new pipes (B) into the closed water path (A) one after another and join the new pipes (B) together to form new pipes ( B ′), and a method for repairing the water channel in which the grout material (a) is filled between the new pipe (B ′) and the closed water channel (A) through the inlet (1) of the new pipe (B). In the grout material (a), a milk (a ′) composed of a curing material, kneaded water and an admixture and added with the admixture as a dispersant, a dilute solution containing a foaming agent (c ′) and Using a bubble group (c) consisting of air (c ″),
The wet density of the grout material (a) is 0.5 t / m ³ or less, the compression strength is 500 kN / m ² or more at the age of 28 days, the air (c ″) is 65% or more by volume ratio, and the kneaded water is cured. The weight ratio to the material shall be 55% or less,
At the construction site, the dilute solution (c ′) and air (c ″) in which the foaming agent is dissolved are sent to the bubble production device (14b), and after the production of the bubbles, the milk (a ′) to which the bubbles and the admixture are added. Are fed into a kneading machine (14a) interposed in an injection pipe (10) connected to the injection port (1), kneaded by the kneading machine (14a), and a low specific gravity grout material (a And the grout material (a) is filled between the new pipe (B ′) and the closed water channel (A).

Further, the water channel repair method of the present invention is a water channel repair method in which a pipe (B) is laid in an open water channel (H) and the grout material (a) is filled around the pipe (B).
As the grout material (a), a milk (a ′) composed of a curing material, kneaded water and an admixture and added with the admixture as a dispersant, a dilute solution containing a foaming agent (c ′) and air (c ″) ) Using a bubble group (c) consisting of
The wet density of the grout material (a) is 0.5 t / m ³ or less, the compression strength is 500 kN / m ² or more at the age of 28 days, the air (c ″) is 65% or more by volume ratio, and the kneaded water is cured. The weight ratio to the material shall be 55% or less,
At the construction site, the dilute solution (c ′) and air (c ″) in which the foaming agent is dissolved are sent to the bubble production device (14b), and after the production of the bubbles, the milk (a ′) to which the bubbles and the admixture are added. Are fed into a kneading machine (14a) interposed in an injection pipe (10) connected to the injection port (1), kneaded by the kneading machine (14a), and a low specific gravity grout material (a And the grout material (a) is filled around the pipe (B).

  Furthermore, the water channel repair method of the present invention is the water channel repair method, wherein the milk (a ′), the diluent (c ′) and the air (c ″) are used in the three systems, and the kneader (14a). And is kneaded by the kneader (14a).

That is, according to the present invention, since the buoyancy increases as the specific gravity of the grout material increases, the grout material has a specific gravity as low as possible.
Next, in order to prevent the above problem from occurring as much as possible even when the specific gravity is low, the present invention includes, as the grout material, a milk composed of a hardener, kneaded water, and an admixture, and the admixture added as a dispersant. Using a foamed diluent and a group of air bubbles, the wet density of the grout material is 0.5 t / m ³ or less, the compressive strength is 500 kN / m ² or more at a material age of 28 days, and the air The volume ratio was 65% or more, and the weight ratio of the kneaded water to the cured material was 55% or less.

Here, the grout material mixed with bubbles is generally called air mortar or air milk, and the difference between the mortar and milk is whether or not sand enters. In the present invention, in order to reduce the weight, a milk specification that does not contain sand, and a milk composed of a hardener, kneaded water, and an admixture and added with the admixture as a dispersant, a dilute solution containing a foaming agent, and By using the air bubble group consisting of air, it is possible to provide a grout material having a high compressive strength while reducing the weight. Further, the wet density of the grout material is 0.5 t / m ³ or less, the compression strength is 500 kN / m ² or more at the age of 28 days, the volume ratio of air is 65% or more, and the weight ratio of the kneaded water to the cured material is By setting it to 55% or less, the waterway can be properly repaired.

  In the present invention, even when the specific gravity is low (light), the admixture is added as a dispersant and the grout material that obtains the required compressive strength is used depending on the order of addition. It is possible to obtain an effect that the buoyancy prevention measure is improved with a simple one. Moreover, since the load based on the buoyancy by the grout material applied to the new pipe can be reduced, the filling length of the grout material between the new pipe and the water channel can be increased, or a long new pipe can be used. At the same time, the filling (placement) speed can be increased, and the cost can be reduced.

Hereinafter, the present invention will be described by illustrating the best mode of the invention.
As an embodiment of the present invention, as a grout material, it comprises a hardener, kneaded water and a milk mixed with an admixture and added with the admixture as a dispersant, and a foam group comprising a foamed diluent and air. The grout material has a wet density of 0.5 t / m ³ or less, the compression strength is 500 kN / m ² or more at 28 days of age, the air is 65% or more by volume, and the weight of the kneaded water relative to the cured material A configuration with a ratio of 55% or less is adopted.

  Here, the admixture added as a dispersant is an admixture used in ordinary concrete, and main examples thereof include polycarboxylic acid, naphthalene sulfonic acid, and melamine sulfonic acid. The amount added is appropriately selected within the range of the amount recommended by the admixture manufacturer for use in concrete in experiments, actual operations, etc., and used in an appropriate amount so that the target strength can be obtained. . For example, the admixture is 0.05% or more and 0.5% or less by weight with respect to the curing material.

  Hardeners include Portland cement, blast furnace cement, fly ash cement, mixed cement, cement-type hardener, alumina cement, lime, gypsum, blast furnace slag, fly ash, etc. Can be mentioned.

Next, the diluting liquid constituting the bubble group is usually composed of a foaming agent and water, and the dilution ratio is a ratio of the foaming agent and water. As the foaming agent, those known for air mortar and air milk can be used, and examples thereof include a foaming agent (trade name: Light Foam) manufactured by Sumitomo Osaka Cement Co., Ltd. The dilution ratio and expansion ratio may be adjusted within the range recommended by the foaming agent manufacturer in experiments, actual operations, etc. For example, in the case of the foaming agent exemplified above, the dilution ratio is 20 times. The expansion ratio may be 25 times. In this case, if the foaming agent is 1 kg, the water will be 19 kg and the diluent will be 20 kg at a dilution factor of 20 times. The air volume is 480 liters when the expansion ratio is 25 times with respect to 20 kg of this diluted solution, and the bubble group volume is 500 liters when the density of the foaming agent and water is 1 kg / liter and the mass of air is 0 kg. Therefore, the total mass of the bubble group is 20 kg, and the density of the bubble group is 20/500 = 0.04 kg / liter (40 kg / m ³ ).

The grout material used in the present invention is manufactured using the above materials.
The compressive strength of the grout material is 500 kN / m ² or more at a material age of 28 days.
The physical properties used for designing the grout material are wet density and uniaxial compressive strength (strength).
There is a general relationship between the wet density and the strength: “When the density is reduced, the strength is also reduced.” When the density is reduced, the number of bubbles increases and the amount of the hardened material decreases. Conversely, when the strength is increased ( Increasing the density) reduces the number of bubbles and increases the hardener. From this relationship, it is generally difficult to increase the strength while reducing the wet density.
For example, if the density of air bubbles is 40 kg / m ³ , and if all grout materials (air milk) 1 m ³ are air bubbles, the air milk has a wet density of 40 kg / m ³ and is lightweight. However, since such a grout material contains no hardener, the strength expression is 0 (uniaxial compressive strength = 0). However, the mass of the bubble group occupies a large weight for further weight reduction.

In a grout material having such characteristics, when a soil tank test is performed, when a grout material having a compressive strength of 100 kN / m ^{2 at} a material age of 28 days is used, a protective effect on the new tube B cannot be obtained. On the contrary, it results in increasing deformation. On the other hand, when the same 500 kN / m ² grout material is used, the protection effect on the new tube B is sufficiently obtained. Therefore, the compressive strength of the grout material in the present invention is required to be 500 kN / m ² or more at a material age of 28 days.
In addition, said soil tank test is based on the method (construction method) described in the following nonpatent literatures 2-3. In other words, this soil tank test is a steel soil tank with an inner space of □ 1.05m x H0.4m, which can be loaded at the same time, filled with Toyoura standard sand as the ground material, and 2mm thick placed in the center of the tank. Steel model existing pipe, FRP pipe with an inner diameter of 150 mm arranged inside the existing pipe, and a model soil tank test device composed of an embedded material filled between the existing pipe and the pipe (FRP pipe) The relationship between the load and the displacement of the tube is obtained.
“Examination of pipe-in-tunnel method with repair of old tunnel” (Abstracts of Annual Meeting of the Agricultural Civil Society of Japan) “Examination of pipe-in-pipe construction method with repair of old pipelines” (Abstracts of Annual Meeting of the Agricultural Civil Society of Japan 2005)

Further, the wet density of the grout material is 0.5 t / m ³ or less.
In consideration of the buoyancy to the new pipe, the wet density is more effective as it lowers the specific gravity of the grout material. However, the wet strength is maintained while securing the compressive strength of 500 kN / m ² or more at the age of 28 days. The range in which the density requirement can be secured simultaneously is set to 0.5 t / m ³ or less.

  The volume ratio of air contained in the bubble group to the entire grout material is 65% or more, and preferably 70% or more. Grout material containing 65% or more of the volume by volume of air should have a very low specific gravity compared to conventional grouting materials, buoyancy to the new pipe should be minimized, and buoyancy prevention measures should be simplified. Can be made, and it is not necessary to take measures to prevent buoyancy. Also, a long tube can be used. On the other hand, the upper limit of the volume ratio of air may be set as appropriate within a range that does not cause deterioration of the function of the grout material.

It should be noted that how to determine the amount of air, for example, if the bubble group is 600 liters in 1 m ^{3 of} the grout material, the remaining 400 liters are shared with the hardener (for example, blast furnace cement type B) and the kneaded water. It will be. In this case, as shown in Table 1 below, it can be seen that the density of the grout material varies depending on its composition (the ratio of the curing material and the kneaded water), and thus the amount and density of the bubble groups are not uniquely related. For this reason, the amount and density of the bubble group are appropriately determined based on other configurations (the ratio of the curing material and the kneaded water).

Moreover, there is no restriction | limiting in particular in the flow value of a grout material, What is necessary is just to set the fluidity | liquidity of a desired grout material suitably according to an application part. For example, it is set to 140 mm or less.
The flow value is based on the cylinder method of the consistency test method of the Japan Highway Public Corporation Standard “Test Method for Air Mortar and Air Milk (JHSA 313-1992)”. That is, the sample was placed in a cylinder having an inner diameter of 8 cm and a height of 8 cm, and the diameter of the bottom surface of the sample after being pulled out was measured.

In the method for producing a grout material, bubbles are produced by using a diluted solution in which a foaming agent is dissolved and air, and then the bubbles and the milk to which the admixture is added are kneaded.
That is, it is necessary to add the admixture to the grout material.
In addition, regardless of the above method, when no admixture is added, the physical properties of the grout material are as follows.
As an example, Table 2 below shows the results of making grout materials with various blends and testing their 28-day strength (compressive strength at 28-day material age).
As shown in this test result, when the W / C is 60% or more (NO1 to NO6), the uniaxial compressive strength (28-day strength) increases as the amount of the hardener increases as in the conventional cement and concrete fields. Although it increases, when W / C is 55% or less (NO7 to NO12), the uniaxial compressive strength decreases even if the amount of the hardener increases.
The reason for this is considered to be that the hardener aggregates and is not uniformly dispersed. When the specimens for compression test of NO7 to NO12 having a large amount of the curing material are observed, it can be confirmed that many dark grains having a diameter of about 1 mm are observed.

As another example, the results are shown in the case where a grout material 1 m ³ having the composition shown in Table 3 below is prepared and tested for its 28-day strength (compressive strength at 28-day age). Also in this result, like the experiment result of Table 2, the uniaxial compressive strength (28-day strength) decreases as the amount of the hardener increases and W / C decreases.

As can be seen from the above examples, in the present invention, an admixture is added as a dispersant in order to prevent aggregation of the curing material and to secure and increase the strength of the grout material. In addition, the dispersing agent is generally used for the purpose of improving fluidity of mortar, concrete, and the like. However, in the present invention, it is used not for improving the fluidity of the grout material but for preventing aggregation when bubbles are mixed.
Moreover, in the manufacturing method of the grout material which concerns on this invention, the addition method of the said admixture (dispersant) needs to add to the milk before mixing bubbles.
In contrast, the method of adding the above admixture to the milk after mixing the bubbles (hereinafter also simply referred to as “post-addition”) has the effect of preventing the aggregation of the hardener and ensuring the strength of the grout material. Not enough.
As an example, Table 4 shows the formulation table and test results when several types of grout materials with different production methods were prepared with the same formulation except for the amount of the dispersant, and the physical properties were tested.

In addition, it is most efficient to add the dispersant at the end, which is usually called post-addition, and this is generally the case. However, as shown in the above test results, in the blending ratio of the present invention, when added at the end (Table 4 NO4 to 5), only the fluidity of the grout material is improved, and it is not sufficient for preventing aggregation of the hardened material (Table 4). 4 Refer to “No. 4-5“ State at the time of mixing ”).
On the other hand, when it is added to the milk before mixing the bubbles (Table 4 NO2 to 3), the milk is satisfactory without aggregation, and a satisfactory value can be obtained at 28 days strength (Table). 4 Refer to NO2-3 “State at the time of mixing” and “28 days strength”).

Next, an embodiment related to a construction method will be described.
The method of the present invention uses the grout material described above for filling between various conventional new pipes and closed channels, or for filling around pipes laid in open channels. In the above, the milk, the diluting solution in which the foaming agent is dissolved, and the air, preferably in the three systems, are each sent to a kneading machine interposed in the injection pipe connected to the injection port and kneaded by the kneading machine. A low specific gravity grout material is manufactured, and the grout material is filled between the new pipe and the water channel.

1 (a) to 1 (f) and FIG. 2 show an embodiment, and this embodiment is strengthened in an agricultural water tunnel channel (existing pipe / closed channel) A having a circular cross section or a horseshoe shape shown in FIG. New pipes B made of plastic composite pipes (thin-walled FRPM pipes) are inserted one after another, and the new pipes B are joined together to form new pipes B ′, and between the new pipes B ′ and the closed channel A The grout material a is filled through the inlet (for example, φ50 mm) 1 of each new tube B.
As for the equipment for inserting the new pipe B and filling the grout material a, the total length of the agricultural water tunnel A is one work area, and the work space H is secured before the entrances at both ends thereof to perform these operations. The grout inlet 1 does not have to be provided in each new pipe B, and is optional for each of the first, second, third, and new pipes B in consideration of the filling properties of the grout material a.

Carrying in (inserting) the new pipe B into the closed channel A is appropriately performed using a known transport carriage or the like, and the connection (joining) of the new pipe B is similarly a pipe made of a reinforced plastic composite pipe. A known means such as using a joint C is employed (see Patent Document 3). Each new pipe B is fixed to the closed water channel A by an appropriate means with its joint.
Japanese Patent Laid-Open No. 2001-21063

  When the transfer and connection of the new pipe B into the closed channel A is completed over one work area (the entire length of the tunnel), as shown in FIG. 1A, the closed water path A and the new pipe B at both ends of the first work area. An end blockage wall D is formed between the two ends by a mortar or the like, and the gap is closed. The end clogging wall D is first attached with a mortar back (for example, length: 600 mm) d1 at the tip of the earliest new pipe B and the rear end of the final new pipe B (both ends of the new pipe B ′), The mortar bag d1 is filled with the grout material a, and after the solidification, a material excellent in drying and cracking resistance such as cement is filled on the outside of the wall, and the end surface treatment d2 is performed.

  Moreover, the drainage port 2 is formed in the upper part in the edge part obstruction | occlusion wall D of one side (right end in a figure). The size or the like of the drain port 2 is appropriately determined based on the data obtained in experiments and actual construction, etc., for the drainage performance of the pool water b described later. Note that the end blocking wall D may employ other known means such as a well-known one such as urethane foam.

If end blockage walls D are formed at both ends of one work area (both ends of the new pipe B ′), the grout material a filling plant equipment E is carried into the work space H at one end of the work area, and the plant The injection hose 10 of grout material a is fed into the new pipe B from the equipment E.
The plant equipment E can have various modes. For example, as shown in FIG. 3 or as shown in FIG. 4, the plant equipment E can be moved to each construction site by installing the plant equipment E on the truck T. Can be.
At this time, the end closing wall D can be attached to the injection hose 10 of the grout material a and subsequently enter the injection step when the closing wall D on one side is completed without waiting for the formation of both ends. In this case, the end blockage wall D may be formed before the grout material a reaches the new tube B inserted last.

  The injection hose (injection pipe) 10 is configured such that the grout material supply hose 11 can be fed from the plant equipment E over the entire length of the closed channel A (new pipe) in one work area. Two injection hoses 13a and 13b are connected to the part through a three-way valve 12 so as to be selectively communicated.

  A blender (kneader) 14a and a bubble production device 14b are interposed on the plant equipment E side of the supply hose 11, and a dilute c ′ and air c ″ in which a foaming agent is dissolved are fed into the bubble production device 14b. Are mixed into a bubble group c, and the bubble group c is further fed into the kneader 14a into which the milk a 'is fed. The kneader 14a causes the bubble group c (diluent c', air c "). And milk a ′ are further kneaded, and the air c ”of the bubble group c is 65% or more and 80% or less of air milk (grouting material) a by volume. The bubble production apparatus 14b is provided. Alternatively, the dilute solution c ′ in which the foaming agent is dissolved and the air c ″ can be directly fed into the other kneader 14a.

  The grout material a is selectively fed into the two injection hoses 13a and 13b through the three-way valve 12. The injection hose 13a, 13b is provided with a connection fitting 15 at its tip, and is connected to the injection port 1 at the upper rear end of each new tube B by this connection fitting 15. In the figure, 16 is a relief valve for the grout material a interposed in the supply hose 11, and 17 is a pressure gauge.

  The milk a ′ is prepared by mixing a hardening material and water in a milk kneading mixer and adding an admixture as a dispersant. ) And the air c ″ of the bubble group c is sent from the compressor to the kneader 14a and the bubble production device 14b through the bubble generation device in three systems, respectively ( (See Fig. 3 and 4.) At the start of injection of grout material a, it is confirmed whether the grout material a satisfies the test conditions by the tests specified in the JHS A313 flow test and the JIS A1216 uniaxial compressive strength test. To do.

  When the closing by the end blocking wall D between the closed water channel A and the new pipe B at both ends of the new pipe B ′ is completed, one of the injection hoses 13a and 13b is connected to the new pipe at one end as shown in FIG. After the grout material a is fed into the injection hose 13a by the three-way valve 12 after being connected to the B inlet 1 and the grout material a is fed into one of the injection hoses 13a, the grout material a It enters between the closed channel A and the new pipe B from the inlet 1 and flows from the inlet 1 to the lower side of the new pipe B with a certain gradient and flows between the new pipe B ′ and the closed channel A while being gradually filled. , And flows toward the other end (the next-stage inlet 1) of the pipe B ′. At this time, the injection pressure is, for example, 0.1 MPa.

  If the injection of the grout material a into the injection port 1 proceeds and, as shown in FIG. 2, the grout material a reaches the next injection port 1 (the injection port 1 of the adjacent new pipe B) and leaks, The feeding of the grout material a to the injection hose 13a is stopped, the other injection hose 13b is connected to the next injection port 1, and the grout material a is sent to the other injection hose 13b by the three-way valve 12, Grout material a is fed between the closed channel A and the new pipe B from the stage inlet 1. As described above, the grout material a enters between the closed channel A and the new pipe B from the inlet 1 and gradually fills between them, while the other end of the new pipe B ′ (the next stage note). Flows towards inlet 1).

  Thus, after confirming the leakage of the grout material a from the next injection port 1 to be injected next, the injection hose 13b of the grout material a is connected to the injection port 1 of the next step. When the grout material a leaks from the next-stage injection port 1, the grout material a has reached the injection port 1, and in that state, the next-stage injection port 1. As shown in FIG. 2, the grout material a fed from the next-stage inlet 1 proceeds toward the previous-stage inlet 1, and from the previous-stage inlet 1, as shown in FIG. There is almost no risk of forming an air layer between the filled layer of the grout material a.

  By repeating this action, as shown in FIG. 1 (d), the grout material a reaches the other end closed wall D and leaks from the drain port 2 at the top of the wall D (see FIG. 1 (e)). Eventually, the filling of the grout material a over the entire length of the new pipe B ′ is completed (FIG. 1 (f)). When these filling operations are completed, the injection hose 10 and the like are removed and the operation is completed.

  The grout material a need only be filled in one day from one end of the new pipe B ′ to the other end (one work zone), but it is usually difficult to fill the entire length in one day. . For this reason, it is carried out in several days. In this case, as shown in FIG. 1C, at the end of the day's work, the end of filling of the grout material a is caused by leakage from the inlet 1. Immediately after confirmation (the grout material a is filled up to the position of the dotted line), the start of the next day is resumed as shown by the solid line by the injection of the grout material a from the inlet 1.

  In this way, the grout material a is supplied to the injection port 1 to be injected the next day at the end of the day's work, like the above-described injection switching of the grout material a from the preceding injection port 1 to the next injection port 1. In that state, the grout material a is injected from the inlet 1 so that the grout material a fed on the next day advances toward the final inlet 1 of the previous day, and the grout of the previous day There is almost no fear of forming an air layer with the packed layer of the material a, and the trouble of stopping the work for one day is eliminated. In this case, the number of days to open (stop) the work is not limited to one day, but is arbitrary as long as there is no trouble.

  In this embodiment, for example, if the grout material a is blended as shown in Table 5, the fluidity (performance determined by the flow value and governs the casting performance) is good, and the uniaxial strength (N / mm 2). ): 0.5 or more, (compressed) air volume (volume%): about 70, specific gravity: about 0.5, and between the new pipe B 'of about 500 m and the closed channel A, the glazing material a is blown Even if it is placed, there is no problem in its workability.

  However, this grout material a is water-impervious (shows the water permeability after curing (water-impervious performance)), and works under water (even if there is some accumulated water in the closed channel, the material is separated at the time of driving. Since it does not occur and the specific gravity is large, it is inferior to the ability to push out water by diving into water). Therefore, as the grout material a is filled between the new pipe B ′ and the closed channel A, the new pipe B ′ The accumulated water b between the closed channels A is difficult to be pushed out. For this reason, a means such as water absorption from the drain port 2 is adopted to appropriately discharge the accumulated water b.

The embodiment is a case of updating the agricultural water tunnel channel A. However, the present invention is not limited to the updating of the agricultural water tunnel channel A, and the existing tube is closed to update the existing pipes such as the water and sewage pipes. Adopted not only in existing pipe renewal methods and pipe-in-pipe construction methods such as forming new pipes by inserting new pipes in order as water channels, but also in pipe-in water channel construction methods that install pipes in existing water channels Needless to say, you can.
At that time, for example, in a pipe with no opening such as a water pipe instead of a pipe having an opening at both ends of a tunnel or the like, a vertical shaft is formed, and the new pipe B and various equipments are carried into the vertical shaft. Then, the new tube B is inserted and the grout material a is filled.
In addition, the plant equipment E can be carried into the new pipe B ′.

  Furthermore, as shown in FIG. 5, the above-described implementation is performed even when the grout material a having the above composition is filled around the pipe B (pipe B ′) laid in the groove (open channel) H cut in the ground. The same effect as the form can be obtained.

Action explanatory diagram of the embodiment of the present invention Action explanatory diagram of the same embodiment Action explanatory diagram of the same embodiment Action explanatory diagram of the same embodiment Action explanatory diagram of the same embodiment Action explanatory diagram of the same embodiment Partial enlarged view for explaining the operation of the embodiment Schematic of an example of plant equipment of the same embodiment Schematic cross section of another example of the plant equipment Cross-sectional view of another embodiment Cross section of conventional example Same part cutaway perspective view

Explanation of symbols

A Closed channel (agricultural water tunnel channel, existing pipe)
B New pipe B 'New pipe C Pipe fitting D End blockage wall H Groove (work space)
a Grout wood (air milk)
a′milk b pooled water c bubble group c ′ dilute solution c dissolving foaming agent ”air 1 inlet 2 drain port 10 grout material injection hose 11 grout material supply hose 12 three-way valve 13a, 13b grout material injection hose 14a blender (Kneading machine)
14b Bubble production device 15 Connection fitting 16 Relief valve

Claims (3)

A new pipe (B) is inserted into the closed channel (A) one after another and the new pipes (B) are joined together to form a new pipe (B ′). The new pipe (B ′) and the closed pipe are closed. A method of repairing a water channel that fills grout material (a) through an inlet (1) of a new pipe (B) between water channels (A),
As the grout material (a), a milk (a ′) composed of a curing material, kneaded water and an admixture and added with the admixture as a dispersant, a dilute solution containing a foaming agent (c ′) and air (c ″) ) Using a bubble group (c) consisting of
The wet density of the grout material (a) is 0.5 t / m ³ or less, the compression strength is 500 kN / m ² or more at the age of 28 days, the air (c ″) is 65% or more by volume ratio, and the kneaded water is cured. The weight ratio to the material shall be 55% or less,
At the construction site, the dilute solution (c ′) and air (c ″) in which the foaming agent is dissolved are sent to the bubble production device (14b), and after the production of the bubbles, the milk (a ′) to which the bubbles and the admixture are added. Are fed into a kneading machine (14a) interposed in an injection pipe (10) connected to the injection port (1), kneaded by the kneading machine (14a), and a low specific gravity grout material (a ) And filling the grout material (a) between the new pipe (B ′) and the closed channel (A). A method of repairing a water channel in which a pipe (B) is laid in an open water channel (H) and the grout material (a) is filled around the tube (B),
As the grout material (a), a milk (a ′) composed of a curing material, kneaded water and an admixture and added with the admixture as a dispersant, a dilute solution containing a foaming agent (c ′) and air (c ″) ) Using a bubble group (c) consisting of
The wet density of the grout material (a) is 0.5 t / m ³ or less, the compression strength is 500 kN / m ² or more at the age of 28 days, the air (c ″) is 65% or more by volume ratio, and the kneaded water is cured. The weight ratio to the material shall be 55% or less,
At the construction site, the dilute solution (c ′) and air (c ″) in which the foaming agent is dissolved are sent to the bubble production device (14b), and after the production of the bubbles, the milk (a ′) to which the bubbles and the admixture are added. Are fed into a kneading machine (14a) interposed in an injection pipe (10) connected to the injection port (1), kneaded by the kneading machine (14a), and a low specific gravity grout material (a ) And filling the grout material (a) around the pipe (B). The milk (a ′), the diluent (c ′) and air (c ″) are fed into the kneading machine (14a) by the three systems and kneaded by the kneading machine (14a). Item 3. A method for repairing a waterway according to item 1 or 2.

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