Quality control system and quality control method

Abstract

To enable a quality change of mortar to be perceived in a step of charging mortar.SOLUTION: A quality control system of mortar which is charged into a filling space between an existing pipe and a renewal pipe disposed inside the existing pipe is configured to include: a unit water amount sensor that detects a unit water amount of the mortar that flows in a charging pipe section that charges the mortar into the filling space; and a determination section that determines if the unit water amount detected by the unit water amount sensor is a predetermined first permissible value.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a quality management system and a quality management method.

Background Art

[0002] There is known a sewer pipe rehabilitation method in which a separate pipe is installed inside an aging sewer pipe, and mortar of a grout material is uniformly filled in the gap formed between the two. In such a sewer pipe rehabilitation method, there is known a technique of adding and mixing a predetermined amount of water to a grout material composition so that a plurality of predetermined properties of the mortar are measured (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Even if it is found by measurement that the conditions as predetermined properties (physical properties) are satisfied at the stage before the kneaded mortar is filled, the physical properties of the mortar change over time while the step of injecting the mortar between the existing pipe and the rehabilitated pipe is being performed. For this reason, it is required to grasp the change in the quality of the mortar in the step of injecting the mortar.

[0005] In consideration of the above problems, an object of the present invention is to enable grasping of the change in the quality of the mortar in the step of injecting the mortar.

Means for Solving the Problems

[0006] One aspect of the present invention for solving the above-described problems is a quality management system for mortar injected into an injection space between an existing pipe and a rehabilitation pipe provided inside the existing pipe. The quality management system includes a unit water amount sensor that detects the unit water amount of the mortar flowing through an injection pipe section that injects mortar into the injection space, and a determination unit that determines whether the unit water amount detected by the unit water amount sensor is a predetermined first allowable value.

[0007] One aspect of the present invention is the above-described quality management system, wherein the first allowable value may be set so as to satisfy a flow value required for the mortar injected into the injection space.

[0008] One aspect of the present invention is the above-described quality management system, wherein the first allowable value may be set so as to satisfy the compressive strength after a predetermined time has elapsed, which is required for the mortar injected into the injection space.

[0009] One aspect of the present invention is the above-described quality management system, wherein the first allowable value may be a value within a predetermined range in which a predetermined margin is set with respect to a reference value.

[0010] One aspect of the present invention is the above-described quality management system, further including a flow path switching unit that switches between an injection flow path that injects mortar from the injection pipe section into the injection space and a non-injection flow path that does not inject mortar from the injection pipe section into the injection space, based on the determination result of the unit water amount by the determination unit.

[0011] One aspect of the present invention is the above-described quality management system, wherein the non-injection flow path through which mortar flows based on the determination result of the unit water amount may be a flow path that discharges the mortar to be kneaded again.

[0012] One aspect of the present invention is the above-described quality control system, further comprising a pressure sensor that detects the pressure in the injection pipe when mortar is being injected, wherein the determination unit further determines whether the pressure detected by the pressure sensor is within the range of a second allowable value, and the flow path switching unit may perform switching between the injection flow path and the non-injection flow path based on the determination result of the pressure by the determination unit.

[0013] One aspect of the present invention is the above-described quality control system, wherein the non-injection flow path through which mortar flows based on the determination result of the pressure may be a flow path that discharges the mortar to be discarded.

[0014] One aspect of the present invention is the above-described quality control system, further comprising a temperature sensor that detects the temperature of the mortar that has been kneaded at a stage prior to flowing into the injection pipe unit, and the temperature detected by the temperature sensor may be used to determine whether the kneaded mortar has a quality that allows injection into the injection space.

[0015] One aspect of the present invention is a management method in a quality control system for mortar injected into an injection space between an existing pipe and a rehabilitation pipe provided inside the existing pipe, the quality control method including a determination step in which a determination unit determines whether the unit water amount of the mortar flowing through an injection pipe unit that injects mortar into the injection space, detected by a unit water amount sensor, is a predetermined allowable value.

Effects of the Invention

[0016] According to the present invention, an effect is obtained in that it becomes possible to grasp changes in the quality of mortar in the process of injecting mortar.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Mode for Carrying Out the Invention

[0018] [Overall Configuration Example of Construction System] FIG. 1 shows an overall configuration example of the construction system (an example of a quality control system) of this embodiment. The construction system in the figure renovates and renews the sewer 10 underground by the pipe rehabilitation method. The repair by the pipe rehabilitation method is not limited to sewers, and for example, water supply pipes, industrial water, etc. may also be targeted. In the following, the case of repairing the sewer 10 will be described as an example.

[0019] In the pipe rehabilitation method, a rehabilitation pipe 12 is installed on the inner wall side of the existing pipe 11 in the sewer 10. The method for installing the rehabilitation pipe 12 is not particularly limited, and for example, any of the known methods may be adopted. As the rehabilitation pipe 12 is formed, a space portion 13 (an example of an injection space) as a gap is formed between the inner wall side of the existing pipe 11 and the outer wall side of the rehabilitation pipe 12. In the pipe rehabilitation method, mortar is injected into the space portion 13. When injecting mortar, a pipe mouth seal 14 is provided at positions corresponding to both ends of the rehabilitation pipe 12 so that the mortar injected into the space portion 13 does not leak out.

[0020] A plant 20 is installed on the ground. The plant 20 is a facility for manufacturing the mortar to be injected into the space portion 13. As a process until the mortar is injected into the space portion 13, first, the powder and water as raw materials of the mortar are kneaded in the first tank 21 provided in the plant 20 to form the mortar. The mortar accumulated in the first tank 21 is injected into the space portion 13 via an injection pipe 31 (an example of an injection piping portion) by the pressure applied by a pump (not shown). In addition, an air vent pipe 33 is provided in the space portion 13. The air vent pipe 33 is provided to allow the air in the space portion 13 to escape as mortar is injected into the space portion 13.

[0021] In this embodiment, the injection pipe 31 is provided with a unit water amount sensor 40a and a pressure sensor 40b. The unit water amount sensor 40a detects the unit water amount of the mortar flowing in the injection pipe 31. The pressure sensor 40b detects the pressure in the injection pipe 31 in a state where mortar is flowing. The detection output of the unit water amount sensor 40a and the detection output of the pressure sensor 40b are input to the quality management device 100.

[0022] In addition, a flow path switching unit 50 is provided in the injection pipe 31. The flow path switching unit 50 switches between a first flow path (an example of an injection flow path) through which mortar flows from the injection pipe 31 into the space portion 13 and a second flow path (an example of a non-injection flow path) through which the mortar flowing into the injection pipe 31 flows from the injection pipe 31 to the return pipe 32 without being injected into the space portion 13. The mortar flowing into the return pipe 32 is stored in a second tank 22 provided in the plant 20. The operation of switching the flow path in the flow path switching unit 50 is controlled by the quality management device 100.

[0023] The quality management device 100 performs quality management of the mortar injected into the injection pipe 31. Specifically, the quality management device 100 determines whether or not the mortar injected into the injection pipe 31 has a quality (injection quality) that can be injected into the space portion 13 based on the detection outputs of the unit water amount sensor 40a and the pressure sensor 40b. The specific content of the injection quality in this embodiment will be described later. When the quality management device 100 determines that the mortar has an injectable quality, it sets the flow path switching unit 50 to a state where mortar flows through the first flow path. On the other hand, when the quality management device 100 determines that the mortar does not have an injectable quality, it controls the flow path switching unit 50 so as to switch to a state where mortar flows from the first flow path to the second flow path.

[0024] Note that, in the figure, an example where the quality management device 100 is installed on the ground at the construction site is shown, but the location where the quality management device 100 is installed is not particularly limited. For example, the quality management device 100 may be installed in the sewer 10. Further, the quality management device 100 may be provided as, for example, a server on the cloud, and may be communicably connected to the unit water volume sensor 40a, the pressure sensor 40b, the flow path switching unit 50, etc. via a network.

[0025] [Regarding the quality evaluation index of mortar] As described above, the mortar used for injection into the space portion 13 is required to satisfy a predetermined injection quality. Hereinafter, the evaluation index of the injection quality in the present embodiment will be described. Heretofore, as an index for evaluating the injection quality of the mortar injected into the space portion, the outside air temperature, the temperature of the water (water temperature) kneaded with the mortar, the unit volume mass, the flow value, and the uniaxial compressive strength have been used. For each of the above indexes, a predetermined value (control value) that satisfies the injection quality of the mortar has been determined.

[0026] When using the above indexes, under the environment of the outside air temperature of the control value, water with a water temperature that satisfies the control value is kneaded with the powder agent to produce mortar, and then the unit volume mass and the flow value are measured. Regarding the uniaxial compressive strength, the uniaxial compressive strength is measured after a predetermined time has elapsed for the mortar sampled as a sample immediately after kneading. In this case, mortar is manufactured at the construction site so as to satisfy the control values of each index other than the uniaxial compressive strength, and the manufactured mortar is injected into the space portion between the existing pipe and the correction pipe. The physical properties of the manufactured mortar change over time. For this reason, under the situation where the mortar is being injected into the space portion, the injection quality of the mortar decreases over time. Currently, for example, since it takes time and effort to measure each index, it is difficult to quantitatively grasp the decrease in the injection quality after the injection of the mortar has started.

[0027] In view of the above, the inventor of the present application focused on the unit water content as an index that can quantitatively measure the physical properties of mortar during injection. The unit water content has a relationship with the water-to-powder ratio of the mortar. The water-to-powder ratio is the weight ratio of the water used in the production of the mortar to the powder that is the material of the mortar.

[0028] Figure 2 shows the relationship between workability and durability with respect to the water-to-powder ratio. In the coordinate plane shown in the figure, the horizontal axis represents the water-to-powder ratio, and the vertical axis represents workability and durability. Workability is an index regarding the ease of handling of the produced mortar in a fluid state. Durability is the performance of resistance to deterioration of the hardened mortar.

[0029] Among the above-mentioned respective indexes, the outside air temperature is related to workability and durability, the water temperature is related to workability, the unit volume mass is related to workability, the flow value is related to workability, and the uniaxial compressive strength is related to durability. Moreover, workability is dominated by the flow value, and durability is dominated by the uniaxial compressive strength. Therefore, in the following description of Figure 2, the case where the flow value is regarded as workability and the uniaxial compressive strength is regarded as durability will be taken as an example.

[0030] In Figure 2, line L1 shows the relationship between workability (flow value) and the water-to-powder ratio. As shown by line L1, workability increases as the water-to-powder ratio increases. Also, line L2 shows the relationship between durability (uniaxial compressive strength) and the water-to-powder ratio. As shown by line L2, the uniaxial compressive strength increases as the water-to-powder ratio decreases.

[0031] For the water-to-powder ratio, an appropriate value range from the upper limit value CU1 that satisfies the injection quality to the lower limit value (primary lower limit value) CL1 is defined. Also, for workability (flow value), a lower limit value CL2 that satisfies the injection quality is determined. For durability (uniaxial compressive strength) as well, a lower limit value CL3 that satisfies the injection quality is determined. The workability (flow value) corresponding to the appropriate value range (CL1 to CU1) of the water-to-powder ratio and being equal to or greater than the lower limit value CL2 is shown as the numerical range BD1. Also, the durability (uniaxial compressive strength) corresponding to the appropriate value range (CL1 to CU1) of the water-to-powder ratio and being equal to or greater than the lower limit value CL3 is shown as the numerical range BD2. In this case, the water-to-powder ratio that can achieve both the workability (flow value) and the durability (uniaxial compressive strength) of the injection quality ranges from the secondary lower limit value CL11 to the upper limit value CU1.

[0032] Therefore, in the present embodiment, the value of the water-to-powder ratio at which the line L1 and the line L2 intersect within the range from the secondary lower limit value CL11 to the upper limit value CU1 is defined as the optimum value CR. The optimum value CR is the water-to-powder ratio that is guaranteed to satisfy both the workability (flow value) and the durability (uniaxial compressive strength) as the injection quality. In the present embodiment, when manufacturing the mortar, the water and the powder which is the material of the mortar may be mixed according to the water-to-powder ratio based on the optimum value CR.

[0033] In the present embodiment, paying attention to the fact that the water-to-powder ratio and the unit water amount have a correlation, the unit water amount is treated as an evaluation index for the injection quality of the mortar. Moreover, in the present embodiment, the unit water amount of the mortar corresponding to the optimum value CR (optimum unit water amount) is derived as the value of the evaluation index (allowable value (an example of the first allowable value)) that satisfies the injection quality of the mortar. The optimum unit water amount may be obtained, for example, by measuring the mortar manufactured by kneading water and powder with weights corresponding to the optimum value CR, or may be obtained as an empirical value, or may be obtained based on the data regarding the relationship between the water-to-powder ratio and the unit water amount accumulated so far.

[0034] Regarding the unit water content of the mortar, it can be easily detected by, for example, an existing unit water content sensor. Therefore, in the construction system of this embodiment, a unit water content sensor 40a is provided in the injection pipe 31 to detect the unit water content of the mortar flowing in the injection pipe 31. The change in the injection quality of the mortar at the stage immediately before being injected into the space portion 13 can be grasped based on the unit water content detected by the unit water content sensor 40a provided in this way. In this case, the unit water content sensor 40a is preferably provided on the side of the injection pipe 31 as close as possible to the discharge port.

[0035] Here, since the allowable value as the optimum unit water content is based on the water-to-powder ratio as the optimum value CR, one unique value corresponding to the optimum value CR can be obtained. However, in the actual situation of injecting the mortar into the space portion 13, if the optimum unit water content is set to a specific single value, the injection quality will not be satisfied due to the value of the unit water content being other than the optimum unit water content, which will rather make quality control difficult. Therefore, in this embodiment, for the optimum unit water content, for example, a predetermined margin may be set with the value based on the optimum value CR water-to-powder ratio as the reference value.

[0036] In addition, as the mortar changes over time, for example, its viscosity increases as a physical property. The higher the viscosity, the more difficult it is for the mortar to flow in the injection pipe 31. Although a constant pressure is applied to the inside of the injection pipe 31 by a pump, as the mortar becomes more difficult to flow, the pressure inside the injection pipe 31 increases. That is, based on the change in the pressure inside the injection pipe 31, it is also possible to grasp the change (deterioration) in the injection quality of the mortar to be injected into the space portion 13 according to the passage of time.

[0037] Therefore, in the construction system of this embodiment, in addition to the unit water amount sensor 40a, a pressure sensor 40b is provided in the injection pipe 31 to detect the pressure in the injection pipe 31. Based on the pressure detected by the pressure sensor 40b, it becomes possible to grasp the change in the injection quality of the mortar at the stage immediately before it is injected into the space portion 13. That is, in this embodiment, in addition to the unit water amount, the pressure (intra-pipe pressure) in the injection pipe 31 is used as an evaluation index.

[0038] An abnormal increase in the pressure in the injection pipe 31 may cause damage to the injection pipe 31. Since the pressure in the injection pipe 31 can be detected by the pressure sensor 40b as in this embodiment, it is also possible to stop the injection of the mortar in response to the pressure in the injection pipe 31 reaching a certain level or higher and avoid damage to the injection pipe 31. By avoiding damage to the injection pipe 31, the construction can proceed smoothly without interruption, and the safety of the workers can also be ensured.

[0039] The allowable value (an example of the second allowable value) of the evaluation index as the intra-pipe pressure may be set within a range that satisfies conditions such as not exceeding the buckling limit pressure of the rehabilitation pipe 12 and being below the predetermined maximum allowable value corresponding to the damage of the injection pipe 31.

[0040] [Functional configuration example of quality management device] With reference to FIG. 3, a functional configuration example of the quality management device 100 will be described. In the figure, together with the quality management device 100, the unit water amount sensor 40a, the pressure sensor 40b, and the flow path switching unit 50 are shown.

[0041] The quality management device 100 in the figure may be configured to include a computer that realizes the functions as each functional unit shown by executing a program. The computer may be configured to include a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), a storage device such as an HDD (Hard Disk Drive) or an SSD (Solid State Drive), and the like.

[0042] The quality control device 100 in FIG. 3 includes an acquisition unit 101, a determination unit 102, a flow path control unit 103, and a user interface unit 104. The acquisition unit 101 acquires the unit water volume detected by the unit water volume sensor 40a and the in-pipe pressure detected by the pressure sensor 40b. The determination unit 102 determines whether or not the mortar flowing through the injection pipe 31 satisfies the injection quality based on the unit water volume or the in-pipe pressure acquired by the acquisition unit 101. Specifically, the determination unit 102 determines whether or not the unit water volume acquired by the acquisition unit 101 is within the allowable value range. If the unit water volume is within the allowable value range, it is determined that the injection quality is satisfied; if the unit water volume is outside the allowable value range, it is determined that the injection quality is not satisfied.

[0043] In addition, the determination unit 102 determines whether or not the in-pipe pressure acquired by the acquisition unit 101 is within the allowable value range. If the in-pipe pressure is within the allowable value range (below the threshold value), it is determined that the injection quality is satisfied; if the in-pipe pressure is outside the allowable value range, it is determined that the injection quality is not satisfied.

[0044] That is, the determination unit 102 determines that the injection quality is not satisfied when at least one of the unit water volume and the in-pipe pressure acquired by the acquisition unit 101 is outside the allowable value range.

[0045] The flow path control unit 103 controls the flow path switching unit 50 so that the flow path of the mortar is switched between the first flow path and the second flow path.

[0046] The user interface unit 104 is a part corresponding to the user interface. Specifically, the user interface unit 104 includes input devices such as a mouse, a keyboard, a touch panel, and a touch pad, and output devices such as a display and a sound output unit.

[0047] [Example of the process procedure of mortar injection] With reference to the flowchart in FIG. 4, an example of the process procedure of mortar injection in this embodiment will be described. Step S100: When injecting mortar into the space portion 13, first, a process of manufacturing mortar is performed at the plant 20. At this time, an operator inputs water and powder, which is a material of mortar, into the first tank 21 according to the water-powder ratio based on the optimum value CR. Also, when manufacturing mortar, it may be performed in a range of allowable outside air temperature in advance. Further, when manufacturing mortar, water within a specified temperature range may be input into the first tank 21. The manufactured mortar is in a state of being stored in the first tank 21.

[0048] Step S102: Next, a process of checking whether the temperature (mixing temperature) of the manufactured mortar is within a predetermined allowable value range is performed.

[0049] Step S104: When it is confirmed that the mixing temperature is within the allowable value range, injection of the mortar stored in the first tank 21 into the space portion 13 is started. At this time, the flow path switching unit 50 forms a first flow path through which the mortar flows from the injection pipe 31 into the space portion 13 under the control of the flow path control unit 103 of the quality control device 100.

[0050] Step S106: While the mortar is being injected into the space portion 13, the acquisition unit 101 of the quality control device 100 acquires the unit water amount detected by the unit water amount sensor 40a. The acquisition of the unit water amount by the acquisition unit 101 may be executed periodically. The determination unit 102 of the quality control device 100 determines whether the unit water amount acquired by the acquisition unit 101 is within the allowable value range.

[0051] Step S108: If it is determined in Step S106 that the unit water amount is not within the allowable value range, the mortar currently flowing through the injection pipe 31 does not meet the injection quality. Therefore, in this case, the flow path control unit 103 of the quality control device 100 controls the flow path switching unit 50 to switch the flow path of the mortar from the first flow path to the second flow path. By switching to the second flow path in this way, the mortar does not flow into the space portion 13 and is made to flow into the second tank 22 via the return pipe 32.

[0052] Step S110: When the mortar that fails to meet the injection quality due to the unit water amount being outside the allowable value range is remixed by adding a mixing agent (such as a fluidizing agent or a water reducing agent) again, it may be possible to restore the injection quality to a state where it is satisfied again. Therefore, as the process of step S110, the mortar stored in the second tank 22 is remixed in step S108.

[0053] Step S112: Under the state where the mortar is being injected into the space portion 13, the acquisition unit 101 of the quality management device 100 acquires the in-pipe pressure detected by the pressure sensor 40b. The acquisition of the in-pipe pressure by the acquisition unit 101 may be executed periodically. When the unit water amount is within the allowable value range in step S106, the determination unit 102 of the quality management device 100 determines whether the in-pipe pressure acquired by the acquisition unit 101 is within the allowable value range. Note that the allowable value of the in-pipe pressure may be such that the upper limit value is set but the lower limit value is not set. In this case, the determination unit 102 may determine whether the in-pipe pressure is within the allowable value range based on whether the in-pipe pressure acquired by the acquisition unit 101 is less than or equal to the threshold value corresponding to the upper limit value.

[0054] Step S114: When it is determined in step S112 that the in-pipe pressure is outside the allowable value range, the mortar currently flowing through the injection pipe 31 does not meet the injection quality. Therefore, in this case, the flow path control unit 103 of the quality management device 100 controls the flow path switching unit 50 to switch the flow path of the mortar from the first flow path to the second flow path.

[0055] Step S116: Mortar that fails to meet the injection quality due to the in-pipe pressure being outside the allowable range is difficult to return to a state where it meets the injection quality even if re-kneaded. Therefore, as the process of step S116, the mortar stored in the second tank 22 by step S114 is discarded.

[0056] Step S118: When it is determined in step S112 that the in-pipe pressure is within the allowable range, the injection of mortar into the space portion 13 continues. Therefore, in step S118, it is determined whether or not the injection of mortar into the space portion 13 has been completed. If the injection of mortar is not completed, the process returns to step S106. Then, when the injection of mortar is completed, the process in the figure ends.

[0057] In the above description, when the unit water volume is outside the allowable range and when the in-pipe pressure is outside the allowable range, the switching to the second flow path is performed in both cases, and the process of whether to re-knead or discard the mortar stored in the second tank is performed. As a modification of this embodiment, a third flow path (an example of a non-injection flow path) may be formed by providing another transfer pipe. A third tank may be further provided at the discharge port of the third flow path. The flow path switching unit 50 is capable of switching the flow path among the first flow path, the second flow path, and the third flow path according to the control of the flow path control unit 103 of the quality management device 100. In this case, the second flow path may be formed when the unit water volume is outside the allowable range, and the third flow path may be formed when the in-pipe pressure is outside the allowable range. With such a configuration, since the transfer pipes through which the mortar is discharged can be separated between the case where the unit water volume is outside the allowable range and the case where the in-pipe pressure is outside the allowable range, it is possible to improve the working efficiency.

Explanation of Reference Numerals

[0058] 10 Sewers, 11 Existing pipes, 12 Recycling pipes, 13 Space part, 20 Plant, 21 First tank, 22 Second tank, 31 Injection pipe, 32 Return pipe, 33 Air vent pipe, 40a Unit water volume sensor, 40b Pressure sensor, 50 Flow path switching part, 100 Quality control device, 101 Acquisition part, 102 Judgment part, 103 Flow path control part, 104 User interface part

Claims

1. A quality control system for injecting mortar into an injection space between an existing pipe and a rehabilitation pipe provided inside the existing pipe, comprising: a unit water amount sensor that detects the unit water amount of the mortar flowing through an injection pipe unit that injects mortar into the injection space; a determination unit that determines whether the unit water amount detected by the unit water amount sensor is a predetermined first allowable value; A quality control system comprising the above.

2. The first allowable value is set so as to satisfy a flow value required for the mortar injected into the injection space. The quality control system according to Claim 1.

3. The first allowable value is set so as to satisfy the compressive strength after a predetermined time has elapsed, which is required for the mortar injected into the injection space. The quality control system according to Claim 1 or 2.

4. The first allowable value is a value within a predetermined range in which a predetermined margin is set with respect to a reference value. The quality control system according to Claim 1 or 2.

5. Further comprising a flow path switching unit that switches between an injection flow path for injecting mortar from the injection pipe unit into the injection space and a non-injection flow path for not injecting mortar from the injection pipe unit into the injection space, based on the determination result of the unit water amount by the determination unit. The quality control system according to Claim 1 or 2.

6. The non-injection flow path through which mortar flows based on the determination result of the unit water amount is a flow path for discharging the mortar to be kneaded again. The quality control system according to Claim 5.

7. Further comprising a pressure sensor that detects the pressure inside the injection pipe unit when mortar is being injected, The determination unit further determines whether the pressure detected by the pressure sensor is within the range of a second allowable value, The flow path switching unit switches between the injection flow path and the non-injection flow path based on the determination result of the pressure by the determination unit. The quality control system according to Claim 5.

8. The non-injection flow path through which mortar flows based on the determination result of the pressure is a flow path for discharging the mortar to be discarded. The quality control system according to Claim 7.

9. Further comprising a temperature sensor that detects the temperature of the mortar kneaded in the previous stage before flowing into the injection pipe unit, The temperature detected by the temperature sensor is used to determine whether the kneaded mortar has a quality that allows injection into the injection space. The quality control system according to Claim 1 or 2.

10. A management method in a quality control system for mortar injected into an injection space between an existing pipe and a rehabilitation pipe provided inside the existing pipe, a determination step in which a determination unit determines whether or not a unit water amount of mortar detected by a unit water amount sensor that detects the unit water amount of mortar flowing through an injection pipe unit that injects mortar into the injection space is a predetermined allowable value A quality control method including the above.

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