JPH0649184B2 - Pipe inner surface lining repair method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention provides a lining repair for an inner surface of an existing pipe such as a gas pipe or a water pipe, in which a repair is performed so as to form a resin lining film on the inner surface of the pipe. Regarding construction method.

[Prior art] In laying pipes such as gas pipes and water pipes, corrosion holes and cracks may occur in the pipes with the passage of time, which may cause leakage, so rehabilitation repair method for repairing leaks or preventive maintenance As a lining repair, a coating is formed on the inner surface of the pipe by using a resin.

Conventionally, as a lining repairing method using this type of resin, the following method is known for existing pipes having a small pipe diameter and a small to medium diameter.

． Spray air flow method For example, JP-A-54-127941 (Japanese Patent Publication No. 58-
No. 14826) and Japanese Patent Application Laid-Open No. 54-156046, a high-speed air flow is made to flow from one end side into the pipe of the construction pipe, and the resin is carried in this air flow to make the pipe inside the pipe. A method in which a film is formed by a resin air flow that adheres to the inner surface by blowing.

． Pig lining method, for example, JP-A-55-44320 and JP-A-58-1.
As in the prior art disclosed in Japanese Unexamined Patent Publication No. 74273 and the like, two front and rear pigs are introduced into the pipe of the construction pipe, the resin is interposed between the pigs, and the resin that advances by the movement of the pig is moved to the rear surface of the pig. A method of forming a coating so that it flows out further backward and is applied to the inner surface of the pipe.

． Resin plug flow method For example, JP-A-57-105270 and JP-A-58-
As in the prior art disclosed in Japanese Patent No. 6272 or the like, a liquid resin having fluidity is injected into a pipe of a construction pipe from an opening at one end thereof in a plug shape so as to close the pipe over a required length, and the resin plug is attached. , A method in which a film is formed by a resin film remaining on the inner surface of the pipe in the process of causing the flow to proceed due to the pressure difference generated in the pipe before and after that.

[Problems to be Solved by the Invention]

By the way, when constructing the lining repair of the laid pipe by the above-mentioned conventional method, the pipe to be constructed is, for example,
When using a small diameter pipe with a small pipe diameter and a pipe system (such as a supply pipe in a gas pipe) in which a curved pipe part such as an elbow or a diameter changing part is present in the middle of the pipe, repair by the pig lining method described above. In the construction method, there is a problem in application because the pig is caught in the middle of the pipeline and cannot move.

Therefore, in the construction of the lining repair targeting the above-mentioned piping system, the repairing method by the above-mentioned spray airflow method is generally put into practical use. However, in the case of this repairing method, the resin used has a low viscosity (for example, 15,000) because the resin is supported by the high-speed air flow and blown into the pipe.
There is a restriction that a resin of 0 cps or less) must be used, and in connection with this, the thickness of the lining coating formed on the inner surface of the pipe is almost 0.5 mm or less and thin, and the film cannot be thickly lined. There was a point.

In this respect, the above-mentioned repair method using the resin plug flow method is attracting attention as a method capable of forming the lining film formed on the inner surface of the pipe to have an appropriate thickness.
However, the prior arts disclosed in the above-mentioned publications and the like conventionally proposed as this construction method have the following problems.

That is, in the above-mentioned prior art, the resin plug of the required length injected into the pipe is made to flow due to the pressure difference generated before and after the resin plug, but the resin plug is moved here only in the pipe depending on the pressure difference. However, if the amount of resin decreases due to the formation of a film due to the progress of flow, a phenomenon occurs in which the flow rate of the resin plug flow gradually increases as the amount of resin decreases. It is known that the flow rate of the resin is related to the thickness of the lining film formed on the inner surface of the pipe as suggested in Japanese Patent Publication No. 50-28456. There has been a problem that the film thickness of the coating film formed on the inner surface of the pipe becomes non-uniform over the entire length of the pipe due to the sequential change of the flow velocity of the plug flow.

Further, the resin plug flow flowing and flowing in the pipe causes the amount of resin to decrease and blow through when advancing a predetermined distance, but in this case, in the above-mentioned prior art, consideration is not given to damping the pressure difference as the flow progresses. As a result, when the resin blows through at the moving end of the flow, the resin blows out vigorously due to the high pressure difference, causing large pressure fluctuations in the pipe, and this pressure fluctuation adversely affects the uncured fruit lining coating formed on the pipe inner surface. The problem that the thickness of the film becomes non-uniform, such as the occurrence of uneven waves in the film due to the above, is also derived.

The present invention solves the above-mentioned problems in the repairing method by the resin plug flow method described above, and the coating formed on the inner surface of the pipe has a constant thickness over the entire length of the construction pipe, and moreover, has a required thickness (thick film). An object of the present invention is to provide a lining repairing method capable of forming a uniform film and being able to cope with a case where a construction pipe is long.

[Means for Solving the Problems]

In order to achieve this object, the present invention provides a construction pipe to be repaired.
A liquid resin A having fluidity is injected into the inside of 1 in a plug shape so as to close the inside of the pipe over a required length, and the resin diameter A, the resin viscosity, and the resin plug A are previously provided before and after the resin plug A. Based on the condition of the length of the resin plug A at the set speed required to form the target thickness of the lining film.
A control means that directly causes a pressure difference that gives fluidity to the front end surface and the rear end surface of the resin plug A, and that attenuates the pressure difference in accordance with the decrease in the resin amount due to the progress of the flow of the resin plug A. A throttle for controlling the flow rate of the compressed air introduced into the pipe at the injection side pipe end of the resin plug A while maintaining the flow velocity of the resin plug flow in the pipe 1 by the control. A launcher 2 having a blower control device 16 including a valve 12 and an on-off valve 14 is connected, and the outlet side pipe end and the discharge side pipe pressure and the discharge air amount that change with the pipe flow of the resin plug A are detected. A receiver 3 equipped with a pressure gauge 20 and a flowmeter 21 is connected, and a signal for detecting the pressure inside the discharge side pipe and the amount of discharged air is used to keep the flow velocity of the resin plug A in the pipe 1 constant. The air blow control device 16 is controlled.

[Work]

In such a repairing method, the resin plug introduced into the repaired construction pipe flows through the pipe due to the pressure difference directly acting on the front and back surfaces, and the lining is made by the resin film remaining on the inner surface of the pipe during the progress. A film is formed, and the thickness of this film depends on the flow velocity of the resin plug flow due to the pressure difference,
It can be freely controlled by appropriately selecting the relational conditions of resin viscosity and resin plug length, so the thickness of the lining film to be formed can be formed to a desired thickness (about 1 mm to 10 mm). It will be possible.

Moreover, in this case, since the pressure difference that imparts fluidity to the resin plug is controlled to be attenuated according to the decrease in the resin amount,
Since the flow velocity does not change due to the decrease in the amount of resin and the flow velocity of the resin plug flow in the pipe is maintained at a substantially constant velocity, the film thickness is made uniform over the entire length of the construction pipe. it can.

In addition, thixotropic resin is used as the resin filled over the required length from the launcher connected to the injection side pipe end of the resin plug, and when external force is applied, the surface of this resin is destroyed and softening phenomenon occurs. To form a coating film in the pipe while flowing, and set a high initial pressing force to give fluidity to the resin plug at the launcher part, and pressing force during running in the pipe after flowing once. Can reduce the amount of air used.

〔Example〕

An embodiment of a lining repairing method according to the present invention will be described below with reference to the drawings.

FIG. 1 schematically shows an example of a construction device in which the repairing method is carried out, and reference numeral 1 is a construction pipe to be repaired.
This construction pipe 1 generally has a diameter of 1 when it comes to gas pipes.
The target is a supply pipe having a diameter of about 5 to 40 mm and a construction pipe having a small diameter and a relatively small diameter called a branch pipe having a diameter of about 50 to 150 mm. The construction pipe 1 is divided into repair sections of a predetermined length for repair, a launcher 2 is connected to the opening at one end, and a receiver 3 that allows the inside to be seen is connected to the opening at the other end. .

A resin injector 4 is connected to the launcher 2 via an opening / closing solenoid valve 5, and the lining resin A is introduced from the resin injector 4 into the launcher 2. Here, the resin A is a liquid resin having a fluidity of a normal temperature two-liquid curing type prepared by mixing a main agent and a curing agent, and a resin having thixotropy is used. It should be noted that the resin injector 4 may be supplied by pressure-feeding a resin in which a main agent and a curing agent are mixed by an air pressurizer in advance, or the main agent and the curing agent may be pressure-fed by separate pumps and statically fed during the pressure-feeding process. Both may be mixed and supplied by a mixer or the like.

The launcher 2 also has a flow control device 7 at its open end.
A small compressor 6 is connected via the compressor 6, and the compressed air from the compressor 6 is introduced into the launcher 2 with its flow rate regulated by the flow rate control device 7 and fed into the construction pipe 1.

The compressed air sent from the compressor 6 is a flow control device.
7 is also introduced into the resin injector 4 via a switching solenoid valve 8 and a governor 9 which are interlocked with 7, and the lining resin A is flow-controlled via a pressure sliding plate 10 provided in the resin injector 4. A predetermined amount is injected into the launcher 2 in a liquid state at a constant pressure through an opening / closing solenoid valve 5 that is opened in conjunction with the device 7.

Further, the flow rate control device 7 controls the supply / cutoff of the compressed air from the compressor 6, a filter 11 for cleaning the compressed air, a flow rate control unit 13 having a throttle valve 12 for controlling the flow rate of the compressed air, and a supply of the compressed air. An on-off valve 14 is provided, and a pressure gauge 15 is provided in the air passage of the on-off valve 14, the on-off valve 14, the relief valve 18, and the throttle valve 12 described above.
And a flow rate controller 16 for controlling the above. The flow rate controller 16 receives a signal such as a pipe flow velocity of a plug flow of the resin A, which will be described later, by the antenna 17, and also controls the throttle valve 12, the relief valve 18, and the opening / closing valve 14 based on the detection of the air pressure by the pressure gauge 15. To control.

On the other hand, the receiver 3 connected to the other opening of the construction pipe 1.
A shutoff valve 28, a pressure gauge 20, a flowmeter 21 and the like are connected to the pressure gauge 20 and the flowmeter 21.
The pressure in the pipe on the discharge side and the amount of exhaust air from the pipe, which change with the flow of, are detected, and the flow velocity of the lining resin A in the pipe is detected by these detections, and this detection signal is transmitted to the transmitter 22 and the antenna 25. The signal is transmitted to the antenna 17 on the start end side via the flow rate controller 7 and is controlled by the flow rate controller 7.

A cyclone-type resin separation hopper 26 having an air discharge valve 27 is connected to the end of the receiver 3 and is preliminarily closed when the lining resin A reaches the receiver 3 through which the inside can be seen. Open the air discharge valve 27 and close the shutoff valve 28 to remove the residual resin from the resin separating hopper.
It is designed to be collected within 26.

Next, the work process of the repair work by the above-mentioned construction device will be described.

First, the opening / closing solenoid valve 5 is opened from inside the resin injector 4 to inject a predetermined amount of the lining resin A in the liquid state into the launcher 2 on the starting end side. This resin A is injected with the lining resin A
Is injected in a plug shape so as to close the inside of the launcher 2 for a required length into the inside of the starting end side pipe of the construction pipe 1. Hereinafter, the resin A injected in this plug shape will be referred to as a resin plug, and the same symbol A as that of the resin will be given to this.

When the injection of the above-mentioned resin plug A is completed, the open / close solenoid valve 5
Closed, open the on-off valve 14 on the side of the blast system and open the compressor 6
The pressure-supplied air from is sent into the pipe from the end of the launcher 2 while controlling the flow rate by the throttle valve 12. As a result, the pressure-fed air from the compressor 6 acts on the rear surface of the resin plug A, causing a pressure difference between the front and rear of the resin plug A, and the fluid pressure is imparted to the resin plug A by the pressure difference. Form a confluence and flow in the pipe of the construction pipe 1 toward the other side.

The pressure acting on the rear side of the resin plug A due to the pressure difference at this time is such that the initial pressure for imparting fluidity to the resin plug A is, for example, approximately 1.5 kg / cm ² or less relative to atmospheric pressure, and the fluidity is imparted. When the resin plug A flows in the pipe of the construction pipe 1, the pressure is adjusted by the relief valve 18 and lowered to a low pressure of, for example, about 0.6 kg / cm ² or less with respect to the atmospheric pressure.

When the resin plug A flows and advances in the pipe, the resin contacting the inner surface of the pipe is adhered and remains on the wall surface of the required thickness due to the adhering force to the wall surface during advancing, and the resin film left on the resin plug flow A After passing through, the lining film 19 having a required film thickness is formed on the inner surface of the tube.

According to an experiment here, when a pressurized fluid is applied to the resin plug A injected into the construction pipe 1 from the rear and the pressure difference of the fluid causes the resin plug A to move in the pipe as a whole, the pressure of the pressurized fluid acts on the resin. The shape of the rear end surface of the plug A is shown in FIG. 3 when the resin plug A flows in the pipe due to the resultant force of the pressing force a shown in FIG. 2, the adhesive force influence coefficient b on the inner wall surface, and the resin shear stress c. Flow progresses in the shape as shown in.

From the above flow progressing state, the pressing force a from the rear side to the resin end face is further increased to increase the flow velocity V of the resin plug A.
When the speed is increased, the above-mentioned resin end surface shape becomes a bullet shape as shown in FIG. 4. On the other hand, when the flow rate V of the resin plug A is decreased by decreasing the pressing force a, as shown in FIG. Moreover, it was found from the results of experiments that the resin end surface shape was close to vertical.

According to the experiment, the resin viscosity cps, the flow velocity V,
The relationship with the film thickness t of the lining film formed is: If the flow velocity V is constant, the one with higher resin viscosity (50,
000 cps to 800,000 cps) has a thin film thickness, and a resin having a low resin viscosity has a thick film. ． It was also found that when the resin viscosity is constant, a film having a higher flow velocity V has a thicker film and a film having a lower flow velocity has a thinner film.

According to the above experimental results, when the resin viscosity is changed while the flow velocity V of the resin plug A is constant, the end surface shape of the resin plug A is lower when the resin viscosity is lower, as shown in FIG. The thicker the film thickness, and the higher the resin viscosity, the vertical end face shape as shown in FIG.

Further, when the resin viscosity is constant and the pressure of the pressurized fluid is increased to increase the flow velocity of the resin plug A, the end face of the resin becomes a bullet shape as shown in FIG. When the fluid pressure is lowered and the flow velocity is slowed, the end face shape of the resin becomes the vertical end face shape shown in FIG. 5, and the film thickness becomes thin.

That is, in terms of the relationship between the resin viscosity and the flow velocity, if the resin plug A is made to flow so that the end surface shape of the resin becomes a bullet shape as shown in FIG.
The film pressure becomes a thin film when the resin plug A is made to flow so as to have a nearly vertical end face shape as shown in the figure.

To theoretically consider this, P in FIG. 4 and FIG.
_1, a component force relationship of the pressure in the P ₂ points, pressure as shown in FIG. 6 in the case of edge shapes are bullet-shaped (Figure 4) is perpendicular to the tangential direction S ₁ of the resin sphere R It acts in the ₀ direction, and the component component of the force is decomposed into a component component R ₁ that causes the resin to flow and a component component R ₂ that presses the resin against the inner wall of the pipe.

On the other hand, when the end face shape of the resin is vertical (Fig. 5),
As shown in FIG. 7, the pressing force of P ₂ equidistant from the inner wall surface of the pipe to P ₁ acts in the Q ₀ direction perpendicular to the tangential direction S ₂ of the resin spherical surface, and the component force flows through the resin. It is decomposed into a component force Q _{1 for} advancing and a component force Q ₂ for pressing the resin against the inner wall of the pipe.

Comparing the above-mentioned component forces R ₁ and Q ₁ that cause the resin to flow and the component forces R ₂ and Q ₂ that press the resin against the inner wall of the pipe, the cannonball type shown in FIG. Force R
₁ is much smaller than the component force Q ₁ corresponding to that of the vertical type shown in FIG. It is understood that the resin remains attached to the inner wall of the pipe as a thick film from the point that the component force of R ₁ balances with the sum of the influence coefficients of the resin shear stress and the adhesive force.

From the above results, if the resin plug A is made to flow so that the end surface shape on the pressure side of the resin plug A becomes a bullet shape (FIG. 4), the thickness of the lining film formed is thick. On the other hand, when the resin plug A is made to flow so as to have a nearly vertical end face shape (shown in FIG. 5), the film pressure of the formed lining film is formed into a thin film experimentally and theoretically. According to the experiment, the results shown in Table 1 were obtained for the relationship between the pipe diameter, the resin viscosity, the injected resin plug length, the resin flow rate, the initial pressing force and the film thickness.

In view of the relationship between the pipe diameter, resin viscosity, and injected resin plug length shown in Table 1 above, when trying to form a No. 2 film thickness of 2.0 mm on the inner surface of the pipe, the resin plug A to be flowed into the pipe is It is necessary to proceed at 9 cm / sec, and it is understood that the thickness of the lining coating formed can be freely controlled by appropriately setting the flow rate of the resin plug A.

Therefore, when constructing the repairing method according to the present invention, first select the thickness of the lining film to be formed on the inner surface of the target construction pipe 1 and select this thickness. The resin plug A required to form a desired film thickness based on the relevant conditions such as the diameter of the pipe to be repaired, the viscosity of the resin to be used, and the length of the resin plug to be injected based on the selection of
Is set, and the pressure difference is selected by controlling the flow rate and pressure of the compressed air from the compressor 6 so that the resin plug A flows and advances in the pipe at the set flow rate.

In this case, the resin to be used is a thixotropic resin as described above, and when an external force is applied to this type of resin, the surface structure of the resin is destroyed to cause a softening phenomenon, and it takes time to remove the external force. Since it has a property of recovering its original state with the passage of time, the pressure difference that imparts fluidity to the resin plug A is, as described above, the pressure of the pressurized fluid (approximately 0.6 kg / cm ² or less when traveling in the pipe after flowing). ), The initial pressure for imparting fluidity is set to a slightly higher pressure of about 1.5 kg / cm ² .

Even if the pressure is set in this way, the initial pressure is the launcher.
It acts on the part 2 and has almost no effect on the inside of the construction pipe 1,
In addition, the pressure after flowing in the construction pipe 1 is set to a low pressure of approximately 0.6 kg / cm ² or less so that it has a slight pressure difference with respect to the atmospheric pressure.
Even in the above, the phenomenon of blow-through from the corrosion hole can be reliably avoided.

Further, when the resin plug A flows in the pipe due to the pressure difference and the formation of the lining coating proceeds, the amount of resin in the resin plug A gradually decreases due to the formation of the coating.

In the present invention, when the resin amount of the resin plug A decreases,
In response to the decrease in the resin amount, the pressure difference is controlled so as to be attenuated, and the flow rate control device 7 controls the compressor 6 so that the in-pipe flow velocity of the control plug A becomes substantially constant.
Control the amount of air from.

That is, when the amount of resin decreases, the flow rate of the resin plug A in the pipe tends to increase accordingly,
The change in the flow velocity is detected by the pressure gauge 20 and the flowmeter 21 provided in the receiver 3 on the arrival side. This is because the pipe pressure in the construction pipe 1 and the amount of accumulated air discharged from the pipe on the front side in the traveling direction of the resin plug A both change relatively in relation to the change in the flow velocity of the resin plug A. , The state of this change, pressure gauge 20 and flow meter 21
The change in the flow velocity of the resin plug A in the pipe is detected by the detection by this, and this detection signal is received by the antenna 17 of the flow rate control device 7 on the starting end side via the transmitter 22 and the antenna 25, and from the pressure gauge 15. Is calculated with the pressure signal of
The relief valve 18, the throttle valve 12, and the opening / closing valve 14 are controlled by the flow rate controller 16 so that a pressure difference is obtained so that the flow velocity of the resin plug A becomes substantially constant, and thereby the construction pipe is passed from the compressor 6 through the launcher 2. The air flow rate of the compressed air introduced into 1 is controlled so that the pressure difference that imparts fluidity to the resin plug A is automatically attenuated as the amount of resin decreases.

When such control is performed, the resin plug A will flow while the flow velocity in the pipe is controlled from the starting end side of the pipe to the moving end at a substantially constant velocity.
The thickness of the lining coating formed on the inner surface of the pipe is constant over the entire length of the construction pipe 1, and a lining coating having a uniform thickness is formed.

Further, when the resin plug flow A flows for the required distance and reaches the moving end where the resin is consumed, the resin is sprayed at that time. In this case, however, if the control as described above is performed, the resin plug flow A When the resin reaches the moving end and the resin blows out, the pressure difference becomes small, so that the pressure fluctuation occurring in the pipe of the construction pipe 1 due to the blowout of the resin plug flow A also becomes small. As a result of the pressure fluctuation, the uncured lining film formed on the inner surface of the pipe is not adversely affected by uneven waves. Further, the influence of pressure fluctuation does not affect other piping systems communicating with the construction pipe 1.

In the repair work of the present invention, there is a restriction on the flow amount of the resin plug A that is caused to flow in the pipe due to the pressure difference,
When the construction pipe 1 to be repaired is long, due to the restriction that a large amount of injected resin cannot be injected, the resin plug A is divided into multiple injections according to its length, and the flow is repeated. The construction may be carried out, or the resin plugs A may be constructed in such a manner that the resin plugs A are injected in a multi-stage manner at predetermined intervals in the interior of the construction pipe so as to be simultaneously advanced.

In this case, according to the experiment, the resin injected and fluidized in the latter stage is
It was confirmed that the film simply started passing over the film formed by the injection flow in the previous stage, and when it reached the inside of the uncoated film, the film formation on the inner surface of the pipe started from there. By this, lining repair for the required length of pipe is achieved up to the end.

Further, in the case of the illustrated embodiment, the pressure difference is generated by causing the pressurized fluid from the compressor 6 to act on the rear side of the resin plug A. This pressure difference is, for example, the front side in the traveling direction of the resin. A negative pressure suction force may be applied to the inside of the pipe to generate a pressure difference in the pipe, or both the pressurized fluid and the negative pressure suction force may be used together to generate the pressure difference.

〔The invention's effect〕

The present invention provides the following effects by adopting the repairing method as described above.

(1) First, the resin plug injected into the construction pipe to be repaired without using a pig flows through the pipe due to the pressure difference between the front and back of the pipe, and remains in contact with the inner wall surface of the pipe during the progress. Since the lining film is formed by the resin film, the thickness of the film can be freely controlled by appropriately selecting the relevant conditions such as the flow rate of the resin plug flow due to the pressure difference and the resin viscosity. As a result, the thickness of the lining film to be formed should be the desired thickness (1 mm
It can be formed to about 10 mm).

(2) In addition, in this case, since the pressure difference that imparts fluidity to the resin plug is controlled to be attenuated in accordance with the decrease in the resin amount, the flow rate does not change due to the decrease in the resin amount, and Since the flow velocity of the resin plug flow in (1) is maintained at a substantially constant velocity, the film thickness can be formed to be uniform over the entire length of the construction pipe.

(3) Further, the resin used can also reduce the sagging phenomenon of the lining coating film by enabling the use of a highly viscous resin having thixotropic properties, and the resin has a pressing force to flow it evenly over the entire rear end surface. Because of the distribution, it is possible to eliminate variations in the film thickness such that the upper surface side of the tube is thin and the lower surface side is thick, and a coating film of uniform thickness can be formed in the tube circumferential direction.

(4) Furthermore, connect the outlet side pipe end of the existing pipe to a receiver equipped with a pressure gauge and a flow meter that detect the discharge side pipe pressure and the discharge air amount that change with the flow of the resin plug in the pipe. And the signal that detects the amount of exhaust air, the blower control device is controlled to keep the flow rate of the resin plug flowing in the pipe constant, so even if the amount of resin decreases, the lining coating with a uniform film thickness can be applied. A film is formed.

(5) Furthermore, since the influence of pressure fluctuation does not affect other piping systems communicating with the construction pipe, for example, a supply pipe branched from the gas pipe as the construction pipe is injected with resin from the ground meter side at its end. When the lining is installed so that it blows to the conduit side, the pressure fluctuation due to the blow-through of the resin does not affect the conduit side.Therefore, it is not necessary to shut off the gas flow in the conduit during the construction, The lining construction of the branch supply pipe can be carried out by the no-blowing method while the gas is being distributed in a normal supply state.

[Brief description of drawings]

FIG. 1 is a cross-sectional view schematically showing an example of a construction apparatus for carrying out the repairing method of the present invention, and FIGS. 2 and 3 are pressing force at the time of resin flow according to the present invention, an influence coefficient of adhesive force, and resin slippage. Vector diagrams showing the relationship of stress, FIGS. 4 and 5 are explanatory views of the resin end surface shape showing the relationship between the resin pressing force at the time of resin flow and the film thickness and the flow velocity, FIG. 6 and FIG. FIG. 7 is an explanatory view showing the component relationship of pressure at the same point in FIGS. 4 and 5, respectively. 1 …… Construction pipe, 2 …… Launcher, 3 …… Receiver, 4
…… Resin injector, 5 …… Open / close control valve, 6 …… Compressor, 7 …… Flow control device, 8 …… Switching solenoid valve, 11 …… Filter, 12 …… Throttle valve, 13 …… Flow control unit, 14 …… Open / close valve, 15 …… Pressure gauge, 16 …… Flow controller, 17 …… Antenna, 18 …… Relief valve, 19 …… Lining coating, 20
...... Pressure gauge, 21 ...... Flowmeter, 23 …… Transmitter, 25 …… Antenna, 26 …… Resin separation hopper, 28 …… Shutoff valve, A …… Resin resin (resin plug).

Claims (1)

[Claims] A liquid resin (A) having fluidity is injected into a construction pipe (1) to be repaired from one end opening thereof in a plug shape so as to close the pipe for a required length, and the resin plug (A) Before and after), flow into the resin plug (A) at the set speed necessary to form the target lining film thickness based on the relational conditions of pipe diameter, resin viscosity, and resin plug (A) length. Control that causes a pressure difference that imparts the property directly to the front end surface and the rear end surface of the resin plug (A), and attenuates the pressure difference in accordance with the decrease in the resin amount due to the progress of the flow of the resin plug (A). Means for controlling the flow velocity of the resin plug flow in the pipe (1) at a substantially constant velocity and controlling the flow rate of the compressed air introduced into the pipe at the injection side pipe end of the resin plug (A). Throttle valve (12) and on-off valve to control air flow rate
A launcher (2) having a ventilation control device (16) equipped with (14)
) Is connected, and a pressure gauge (20) and a flow meter (21) are provided at the other outlet side pipe end to detect the discharge side pipe pressure and the discharge air amount that change as the resin plug (A) flows inside the pipe. (3) is connected to the blower control device (16) so as to keep the flow velocity of the resin plug (A) in the pipe (1) constant by a signal that detects the pressure in the discharge side pipe and the amount of exhaust air. A lining repairing method for the inner surface of the pipe characterized by being controlled.