Backfilling method, backfilling management device, and backfilling system for existing pipe rehabilitation

Abstract

To prevent a support from being destroyed by external force in the backfilling process of an existing pipe rehabilitation method.SOLUTION: A rehabilitation pipe 3 is installed inside an existing pipe 1 to be rehabilitated. A support 21 for restricting the floating of the rehabilitation pipe 3 is installed inside the rehabilitation pipe 3. A backfilling material 4 is injected between the rehabilitation pipe 3 and the existing pipe 1. During injection, displacement of the rehabilitation pipe 3 is measured by a displacement meter 31. A safety processing unit 32 performs safety processing to prevent destruction of the support 21 on the basis of the displacement measured by the displacement meter 31.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a backfilling method in a construction method for rehabilitating existing pipes, such as aging sewer pipes, and in particular to a method for injecting backfill material between a rehabilitation pipe installed within the existing pipe to be rehabilitated and the existing pipe, as well as a backfilling management device and a backfilling system. [Background technology]

[0002] A known method for rehabilitating existing pipes, such as aging sewer pipes, involves installing a rehabilitating pipe inside the existing pipe and filling the backfill space between the inner periphery of the existing pipe and the outer periphery of the rehabilitating pipe with backfill material (see Patent Documents 1 and 2, etc.). When the backfill material is injected, the buoyancy of the backfill material causes the rehabilitating pipe to tend to float up. To prevent this, supports are installed inside the rehabilitating pipe.

[0003] For example, the support structure in Patent Document 1 includes rod-shaped supports arranged in a vertical and horizontal cross pattern with jack bolts. The lower ends of the vertical supports are grounded on the inner bottom surface of the rehabilitating pipe via bottom wales. The upper ends of the vertical supports are passed through through holes at the top of the rehabilitating pipe and abut against the top of the existing pipe. Both ends of the horizontal supports are abutted against the inner surface of the rehabilitating pipe via wales.

[0004] The support structure in Patent Document 2 includes an annular frame and multiple short rod-shaped supports with jack bolts. The multiple supports are arranged radially around the annular frame at intervals. Each support is abutted against the inner surface of the rehabilitating pipe via a wale. Furthermore, the support at the upper end of the annular frame is abutted against the top of the existing pipe through a through-hole at the top of the rehabilitating pipe. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 7-268853 [Patent Document 2] Japanese Patent Application Publication No. 10-121565 Summary of the Invention [Problem to be solved by the invention]

[0006] In the backfilling process of this type of existing pipe rehabilitation method, the buoyancy and pressure caused by the injection of backfill material act as external forces on the support structure via the rehabilitation pipe. If this external force becomes excessive, the support structure will be destroyed, causing the rehabilitation pipe to float and large cross-sectional deformation. In view of the above circumstances, the present invention aims to prevent the destruction of supports due to external forces during the backfilling process of the existing pipe rehabilitation method. [Means for solving the problem]

[0007] In order to solve the above problems, the backfilling method for rehabilitating existing pipes according to the present invention includes: A backfilling method for injecting backfill material between a rehabilitation pipe installed in an existing pipe to be rehabilitated and the existing pipe, a step of installing a support structure in the rehabilitation pipe to restrict floating of the rehabilitation pipe; after said placement, initiating said injection; a step of measuring the displacement of the rehabilitating pipe by a displacement meter during the injection; a step of performing safety processing to prevent destruction of the support structure based on the displacement measured by the displacement meter; The present invention is characterized by the following.

[0008] When the backfill material is injected, the support resists the buoyancy from the backfill material, preventing the rehabilitated pipe from floating up. However, as the injection of backfill material progresses and the external force due to the buoyancy and pressure from the backfill material increases, and approaches the load capacity of the support, the rehabilitated pipe will undergo small cross-sectional deformation (displacement) in parts. This displacement is a sign that the support will buckle or otherwise fail. The amount of displacement correlates with the magnitude of the external force. By measuring this amount of displacement with a displacement meter, it is possible to detect signs of the support failing. Then, safety measures can be taken before the external force exceeds the load capacity of the support. Safety measures include issuing an alarm using an alarm means, stopping the injection of backfill material, reducing the injection flow rate, etc. In this way, the support structure can be prevented from being destroyed.

[0009] Preferably, the displacement of the top of the rehabilitating pipe is measured by the displacement meter. Normally, the bottom of the rehabilitated pipe is restrained by support when backfill material is injected. On the other hand, the top of the rehabilitated pipe is not restrained and can be displaced. Therefore, when the rehabilitated pipe undergoes cross-sectional deformation due to external forces from the backfill material, the displacement at the top of the rehabilitated pipe is greater than the displacement at other parts. Therefore, by using the top of the rehabilitated pipe as the displacement measurement point, displacement measurement can be facilitated and signs of support failure can be reliably detected.

[0010] Preferably, the displacement of the rehabilitation pipe relative to the support is measured by the displacement meter. This allows the displacement standard to be clearly defined. In addition, the displacement of the rehabilitated pipe relative to the existing pipe can be measured via the support structure. In order to measure the displacement of the rehabilitating pipe relative to the existing pipe, it is not necessary to install a displacement meter, for example, between the existing pipe and the rehabilitating pipe.

[0011] Preferably, the displacement of the rehabilitating pipe near a backfilling material injection hole formed in the rehabilitating pipe is measured by the displacement meter. During the injection process, the backfill material is injected through the injection hole into the backfill space between the existing pipe and the rehabilitating pipe. Because the backfill material is viscous, it fills first along the pipe axis at positions closer to the injection hole in the backfill space, and later at positions farther from the injection hole. As a result, the displacement of the rehabilitating pipe increases the earlier it is filled. Therefore, by measuring displacement at positions close to the injection hole, it is possible to quickly detect signs of support failure. Preferably, the distance from the displacement sensor to the injection hole along the pipe axis is equal to or less than half the pitch of the supports.

[0012] Preferably, the safety process includes issuing a warning by emitting a warning light, sound, or displaying a warning or a displacement amount. When the displacement measured by the displacement meter reaches a predetermined amount, the alarm means is activated to issue an alarm by emitting a light or sound, or displaying an alarm or a displacement amount. In response to the alarm, the worker can take safety measures such as stopping the injection of backfill material.

[0013] If, for the above safety reasons, the valves in the backfill material injection system are all closed in one go to abruptly stop the injection of the backfill material, there is a risk that the injection pipes in the injection system will burst before or after the valves or near the injection pump. Therefore, the safety treatment preferably includes gradually reducing the injection flow rate of the backfilling material, thereby preventing the injection pipe from being damaged by a sudden change in the injection flow rate. The injection flow rate of the backfill material may be reduced stepwise over multiple times, or may be reduced continuously and steplessly. For example, the injection flow rate of the backfill material can be gradually reduced by gradually or stepwise reducing the opening of the variable throttle valve. The gradual reduction operation may be performed manually by an operator, or may be performed automatically by a controller (control means).

[0014] The safety treatment may include an operation of releasing a portion of the backfill material into a drain pipe. This allows the injection flow rate of the backfill material to be reduced by the amount of material that is released. After that, the injection of the backfilling material may be stopped. Since the injection flow rate of the backfilling material is temporarily reduced by the amount of the escape flow rate before the injection is stopped, the range of change in the injection amount when the injection is stopped can be reduced, and the injection pipe can be prevented from bursting.

[0015] The device of the present invention is a backfill management device that manages the injection of backfill material between an existing pipe and the rehabilitation pipe, which is carried out in a state where a rehabilitation pipe is installed inside the existing pipe to be rehabilitationd and a support structure that restricts the floating of the rehabilitation pipe is installed inside the rehabilitation pipe, and a displacement meter for measuring the displacement of the rehabilitating pipe during the injection; a safety processing unit that performs safety processing to prevent destruction of the support structure based on the displacement measured by the displacement meter; The present invention is characterized by the following. When injecting backfill material, the displacement of the rehabilitation pipe is measured by a displacement meter, and safety measures are taken by the safety treatment section based on the measured displacement. This prevents the support from being destroyed.

[0016] Preferably, the displacement meter is provided in the support immediately below the top of the rehabilitation pipe, and measures the displacement of the top relative to the support. This clarifies the standard for displacement and makes displacement measurement easier. Furthermore, the displacement of the rehabilitated pipe relative to the existing pipe can be measured via the support structure.

[0017] Preferably, supports are installed at multiple positions spaced apart in the axial direction of the rehabilitated pipe, and the displacement meter is provided on the support closest to the backfill material injection hole formed in the rehabilitated pipe. This allows safety measures to be taken based on the displacement of the rehabilitation pipe at a position close to the injection hole, and ensures that the destruction of each support structure is prevented in advance. In addition, displacement meters may also be installed on supports far from the injection holes.

[0018] Preferably, the safety processing section includes an alarm generating means having at least one of an alarm lamp, an alarm buzzer, and a display. This allows the system to warn that the displacement of the rehabilitating pipe or the load on the support has reached a predetermined level by emitting a warning light, sounding a warning buzzer, or displaying a warning or displacement amount on the display. In response to the warning, workers can stop the injection of backfill material or reduce the injection flow rate.

[0019] Preferably, the safety treatment section includes an injection flow rate adjustment valve provided in the backfill material injection pipe, and a valve control means for remotely operating the injection flow rate adjustment valve. This allows the injection of backfilling material to be stopped or the injection flow rate to be reduced based on the measured displacement through automatic control by the valve control means.

[0020] Preferably, the safety treatment section includes a drain flow rate adjustment valve provided in a drain pipe branched from the backfill material injection pipe, and a valve control means for remotely operating the drain flow rate adjustment valve. This allows the valve control means to automatically control the backfill material to escape to the drain pipe based on the measured displacement, thereby reducing the injection flow rate.

[0021] The system of the present invention is a backfilling system that injects backfill material between a rehabilitation pipe installed in an existing pipe to be rehabilitated and the existing pipe, an injection system having an injection pump for the backfill material and an injection pipe extending from the injection pump; a support structure installed in the rehabilitation pipe to restrict the floating of the rehabilitation pipe; a displacement meter for measuring the displacement of the rehabilitating pipe during the injection; a safety processing unit that performs safety processing to prevent destruction of the support structure based on the displacement measured by the displacement meter; The present invention is characterized by the following. [Effects of the Invention]

[0022] According to the present invention, it is possible to prevent the support structure from being destroyed by external forces during the backfilling process of the existing pipe rehabilitation method. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. 1 shows a first embodiment of the present invention, and is a front cross-sectional view along line II in FIG. 2 of a support device installed in a rehabilitation pipe within an existing pipe to be rehabilitated, during the injection of backfill material. [Figure 2] FIG. 2 is a side cross-sectional view of the support device taken along line II-II in FIG. [Figure 3] FIG. 3 is an explanatory diagram of a backfilling system including the support device. [Figure 4] FIG. 4 is an explanatory diagram of a backfilling system according to a second embodiment of the present invention. [Figure 5] FIG. 5 is an explanatory diagram of a backfilling system according to a third embodiment of the present invention. [Figure 6] FIG. 6 is an explanatory diagram of a backfilling system according to a fourth embodiment of the present invention. [Figure 7] FIG. 7 is an explanatory diagram of a backfilling system according to a fifth embodiment of the present invention. [Figure 8] FIG. 8 is an explanatory diagram of a backfilling system according to a sixth embodiment of the present invention. [Figure 9] FIG. 9 shows a seventh embodiment of the present invention and is a front cross-sectional view of a support device installed in a rehabilitating pipe inside an existing pipe to be rehabilitated. DETAILED DESCRIPTION OF THE INVENTION

[0024] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. <First embodiment (FIGS. 1 to 3)> 1 and 2 show how to rehabilitate an existing pipe 1. The existing pipe 1 to be rehabilitated is, for example, an aging sewer pipe. Note that the existing pipe to be rehabilitated is not limited to a sewer pipe, but may also be a water pipe, a gas pipe, an agricultural water pipe, a hydroelectric power generation water pipe, a tunnel, etc.

[0025] As shown in Figures 1 and 2, a rehabilitation pipe 3 (lining pipe) is installed inside an existing pipe 1. The rehabilitation pipe 3 is configured as a helical pipe made by spirally winding a long strip-shaped member 3a (profile) made of synthetic resin. Note that the rehabilitation pipe 3 is not limited to a helical pipe, and may be a synthetic resin tube, a tubular shape formed by connecting multiple annular segments in the axial direction of the pipe, or a tubular shape formed by combining multiple plate-shaped segments in the circumferential and axial directions of the pipe.

[0026] As shown in Figure 1, a backfill space 2 is defined between the inner periphery of the existing pipe 1 and the outer periphery of the rehabilitation pipe 3. A backfill material 4 is injected and filled into the backfill space 2. The backfill material 4 is a viscous fluid when injected, and hardens after injection. Mortar or cement milk is used as the backfill material 4.

[0027] As shown in Figure 3, the backfilling system 5 for injecting backfilling material comprises an injection system 10 for the backfilling material 4, a shoring device 20, and a backfilling management device 30. The injection system 10 has an injection pump 11 and an injection pipe 12 for the backfilling material 4. The injection pump 11 is mounted on, for example, a work vehicle 6 shown in a simplified form in the figure. An injection pipe 12, such as a resin hose, extends from the injection pump 11 and is installed inside the manhole 7 and the rehabilitation pipe 3. The injection pipe 12 is provided with, for example, a manually operated on-off valve 13.

[0028] 2, an injection hole 3d is formed, for example, near the top of the rehabilitating pipe 3. The tip of the injection pipe 12 is connected to the injection hole 3d and faces the backfill space 2.

[0029] As shown in Figures 1 and 2, a shoring device 20 is installed inside the rehabilitating pipe 3 to restrict floating and cross-sectional deformation of the rehabilitating pipe 3 when backfill material is injected. The shoring device 20 includes a plurality of shoring structures 21 and a waling 22. As shown in Figure 2, the plurality of shoring structures 21 are arranged at intervals in the axial direction of the rehabilitating pipe 3. In other words, the shoring structures 21 are installed at a plurality of positions spaced apart in the axial direction of the rehabilitating pipe 3.

[0030] As shown in Figure 1, the support structure 21 includes vertical and horizontal rod-shaped supports 23, 24 arranged in a cross shape. Each support 23, 24 includes a jack bolt 25 and is extendable. The vertical load-receiving support 23 is arranged vertically along the vertical center line Lc of the support device 20. The bottom (lower end) of the vertical load-receiving support 23 is grounded to the bottom of the rehabilitating pipe 3 via a bottom wale 22B. This restrains the bottom of the rehabilitating pipe 3 from displacing relative to the existing pipe 1.

[0031] The upper end bracing portion 23p of the vertical load-receiving support 23 abuts against the top of the existing pipe 1 through the through hole 3c in the top 3p of the rehabilitation pipe 3. The top 3p of the rehabilitation pipe 3 can be displaced up and down along the upper end bracing portion 23p.

[0032] As shown in Figure 1, horizontal supports 24 intersect at the middle of vertical load-bearing supports 23. Both ends of the supports 24 are abutted against the inner side surfaces of the sides of the rehabilitating pipe 3 via wale raisers 22. As shown in Figure 2, each wale raiser 22 extends in the pipe axial direction (left and right direction in the figure). The wale raisers 22 restrain the rehabilitating pipe 3 so that it does not deform in cross section.

[0033] As shown in FIG. 3, the backfill management device 30 manages the injection of backfill material 4 into the backfill space 2 and includes a displacement meter 31 and a safety processing unit 32. For example, a contact-type displacement meter is used as the displacement meter 31. As shown in FIG. 1, the contact-type displacement meter 31 includes a movable probe 31a that is linked to the object to be measured, a main body 31b that slidably holds the movable probe 31a, and a displacement detection circuit 31c housed in the main body 31b. The displacement detection circuit 31c outputs a detection signal corresponding to the position of the movable body 31a and thus the displacement of the object to be measured. The detection signal may be output as an analog signal such as a voltage, or may be output as a digital signal. Instead of a contact-type displacement meter, a non-contact displacement meter such as a laser displacement meter or an ultrasonic displacement meter may be used as the displacement meter 31.

[0034] As shown in FIG. 2, the measurement target of the displacement meter 31 is the rehabilitating pipe 3. The displacement meter 31 is arranged inside the rehabilitating pipe 3 that is the measurement target. Preferably, the displacement meter 31 is attached to a support device 20 inside the rehabilitating pipe 3. More preferably, the displacement meter 31 is provided on the support 21A (one support) that is closest to the injection hole 3d among the multiple supports 21. The distance from the displacement meter 31 to the injection hole 3d along the pipe axis direction is equal to or less than half the arrangement pitch of the supports 21.

[0035] More specifically, as shown in FIG. 1 , the displacement meter 31 is provided in a portion 23d directly below the top 3p of the rehabilitating pipe in the vertical load-bearing support 23 of the shoring 21A. The main body 31b of the displacement meter 31 is fixed to the portion 23d directly below. The movable probe 31a protrudes upward from the main body 31b and is fixed in abutment against the inner surface of the top 3p of the rehabilitating pipe 3. The movable probe 31a slides in response to the displacement of the top 3p of the rehabilitating pipe 3, and the displacement detection circuit 31c outputs a detection signal corresponding to the sliding position of the movable probe 31a. In this way, the displacement meter 31 measures the displacement of the top 3p of the rehabilitating pipe relative to the shoring 21A. Because the shoring 21A is fixed to the existing pipe 1, the displacement meter 31 obtains displacement information of the rehabilitating pipe 3 relative to the existing pipe 1.

[0036] 3, the safety processing section 32 performs safety processing to prevent destruction of the support 21 based on the displacement measured by the displacement meter 31, and includes a controller 33 (alarm control means) and an alarm means 40. The controller 33 includes an input section 34, a CPU 35, a memory section 36, an alarm drive circuit 37, etc. A detection signal line 31d from the displacement meter 31 is connected to the input section 34. The input section 34 converts the electrical signal from the displacement meter 31 into a signal for use by the controller 33. A control program for safety processing is executed by the CPU 35.

[0037] The memory unit 36 stores the control program and data such as a threshold value Δs for safety processing. The threshold value Δs corresponds to the allowable displacement of the rehabilitating pipe 3, which is set so that the external force due to buoyancy and pressure when injecting the backfill material 4 does not exceed the load capacity of the support 21. Preferably, the threshold value Δs is set to a value that takes into account a safety factor for the "deflection amount" of the rehabilitating pipe 3 when a line load calculated from the load at which the supports 23 of the support 21 buckle and the installation pitch of the support 21 is applied to the rehabilitating pipe 3. Furthermore, the storage unit 36 may include a data logger that stores the displacement measured by the displacement meter 31.

[0038] An alarm means 40 is connected to the alarm drive circuit 37 of the controller 33 . The alarm emitting means 40 is operated by automatic control of the controller 33 based on the displacement measured by the displacement meter 31. The alarm emitting means 40 has at least one of an alarm lamp 41, an alarm buzzer 42, and an indicator display 43. It may have only one, two, or all three of these three. The alarm lamp 41 emits an alarm light. An example of the alarm lamp 41 is a rotating alarm light. The warning buzzer 42 outputs a warning sound.

[0039] The display 43 displays an alarm or a displacement amount. The alarm display includes characters, symbols, illustrations, etc., indicating that the displacement of the rehabilitating pipe top portion 3p has reached a predetermined magnitude (for example, a threshold value Δs). The displacement amount display is a display (raw data) of the displacement measurement value obtained by the displacement meter 31, and may be a numerical display, a graphical display such as a bar graph, or a graphic display. Preferably, the displacement amount display is always displayed in real time, regardless of whether the displacement of the rehabilitating pipe top portion 3p has reached the threshold value Δs.

[0040] The backfilling process in the rehabilitation method for the existing pipe 1 is carried out as follows. After the rehabilitation pipe 3 is installed in the existing pipe 1, the support device 20 is installed in the rehabilitation pipe 3. At this time, the upper end tensioning portion 23p of the vertical load-receiving support member 23 is passed through the through hole 3c in the rehabilitation pipe top portion 3p and brought into contact with (opposes) the top of the existing pipe 1. Also, an injection hole 3d is formed in the rehabilitation pipe 3, and the tip of the injection pipe 12 is connected to the injection hole 3d. A displacement meter 31 is installed on the support 21A closest to the injection hole 3d. Thereafter, the injection pump 11 is driven, the on-off valve 13 is opened, and the injection of the backfilling material 4 is started. The backfilling material 11 is injected from the injection pump 11 through the injection pipe 12 into the backfilling space 2.

[0041] When the backfill material 4 is injected, the rehabilitating pipe 3 is subjected to buoyancy and pressure from the backfill material 4 in the backfill space 2. Furthermore, the buoyancy and pressure act as an external force on the shoring device 20 via the rehabilitating pipe 3. This external force (load) is received by the shoring device 20. This makes it possible to prevent the rehabilitating pipe 3 from floating up or undergoing significant cross-sectional deformation. In particular, the shoring 21 can prevent the rehabilitating pipe 3 from floating up. The vertical load is mainly received by the vertical load-bearing shoring material 23 of the shoring 21.

[0042] On the other hand, as shown in Figure 1, when the external force (buoyancy and pressure) from the backfill material 4 increases and approaches the load-bearing capacity of the support 21, even if the load-bearing capacity has not yet been reached, the parts of the rehabilitating pipe 3 that are not directly restrained by the support device 20 will undergo slight cross-sectional deformation (displacement). In particular, the top 3p of the rehabilitating pipe will be slightly displaced in the vertical direction. The amount of displacement of the top 3p of the rehabilitating pipe at this time depends on the magnitude of the external force, the rigidity and pipe diameter of the rehabilitating pipe 3, etc. Such displacement of the rehabilitating pipe 3 is a sign of destruction of the support 21, such as buckling of the vertical load-bearing support 23. In FIG. 1, the rehabilitating pipe 3 before cross-sectional deformation (displacement) is indicated by a two-dot chain line, and the rehabilitating pipe 3 after cross-sectional deformation (displacement) is indicated by a solid line.

[0043] Furthermore, because the backfill material 4 is viscous during injection, it fills the backfill space 2 first in the pipe axial direction near the injection hole 3d, and fills later in the pipe axial direction farther from the injection hole 3d. That is, as shown in FIG. 2, the liquid level 4L of the backfill material 4 in the backfill space 2 during injection is higher the closer to the injection hole 3d and lowers with increasing distance from the injection hole 3d. Because the external force from the backfill material 4 is greater the higher the liquid level 4L, the greater the displacement of the rehabilitating pipe 3 in the pipe axial direction near the injection hole 3d. Therefore, the displacement of the rehabilitating pipe top 3p near the shoring 21A closest to the injection hole 3d increases before the displacement of the rehabilitating pipe top 3p near the other shoring 21. Furthermore, the load on the shoring 21A closest to the injection hole 3d increases before the load on the other shoring 21.

[0044] Such displacement of the rehabilitating pipe 3 is measured by the displacement meter 31. This makes it possible to detect signs of destruction of the support 21. By monitoring the displacement of the top 3p, which is the part of the cross section of the rehabilitation pipe 3 where the displacement is relatively greatest, it is possible to reliably detect signs of destruction of the support 21. Because the support 21 is not displaced relative to the existing pipe 1 before destruction, the displacement meter 31 installed on the support 21 can measure the displacement of the rehabilitating pipe 3 relative to the existing pipe 1 via the support 21. Therefore, there is no need to install a displacement meter 31, for example, between the existing pipe 1 and the rehabilitating pipe 3 in order to measure the displacement of the rehabilitating pipe 3 relative to the existing pipe 1. Furthermore, by attaching a displacement meter 31 to the support 21A, which is closest to the injection hole 3d among the multiple supports 21, it is possible to measure the displacement of the part of the rehabilitation pipe 3 where the displacement increases first, and to quickly detect signs of destruction of the support 21A.

[0045] Displacement information measured by the displacement meter 31 is input to the controller 33 of the safety processing part 32. In the controller 33, the CPU 35 determines whether or not the measured displacement has reached a threshold value Δs (allowable displacement amount).

[0046] When it is determined that the measured displacement has reached the threshold value Δs, a control signal is output from the CPU 35 to the alarm driving circuit 37. In response to the control signal, the alarm driving circuit 37 outputs a drive signal to the alarm means 40. The drive signal activates the alarm means 40, thereby carrying out safety processing. More specifically, the alarm lamp 41 emits an alarm light. Alternatively, the alarm buzzer 42 outputs an alarm sound. Alternatively, a warning display or a displacement amount display is shown on the display 43.

[0047] This allows the worker to recognize that the rehabilitation pipe 3 has undergone a predetermined displacement, and ultimately recognize that signs of destruction of the support structure 21 have been detected, and to take the necessary operations to prevent destruction, such as stopping the injection of backfill material 4. For example, an operator can stop the injection of the backfill material 4 by manually closing the on-off valve 13 or by stopping the injection pump 11. By stopping the injection, the cross-sectional deformation (displacement) of the rehabilitation pipe 3 is stopped, and the load applied to the support 21 can be prevented from increasing any further, thereby preventing the support 21 from being destroyed. In particular, the vertical load-receiving support 23 can be prevented from buckling due to an excessive load.

[0048] By using the displacement of the rehabilitation pipe 3 near the support 21A, where the applied load will increase first, as the standard, safety measures can be taken for the other supports 21 at a safer time, thereby reliably preventing destruction in advance. The high level backfill material 4 near the injection hole 3d in the backfill space 2 flows to the low level side in the pipe axial direction, thereby reducing the load applied to the support 21A after injection is stopped. The alarm issuing means 40 may be configured to stop issuing an alarm manually by an operator or automatically by the controller 32.

[0049] After safety treatment is performed, the backfill material 4 injected into the backfill space 2 is allowed to harden to a certain extent for a while (for example, 12 hours to the next day). As the backfill material 4 hardens, its buoyancy weakens, and preferably disappears. Then, injection of the backfill material 4 is resumed. Prior to resuming, it is preferable to slightly loosen the jack bolts 25 of the support structure 21 to remove the excessive pressing force caused by the decrease in buoyancy. Then, the backfill material 4 is injected until it is filled into the backfill space 2. At this time, the backfill management device 30 monitors the displacement of the rehabilitation pipe 3, and when the displacement reaches a predetermined size, safety treatment is performed.

[0050] Next, another embodiment of the present invention will be described. In the following embodiment, the same components as those already described will be denoted by the same reference numerals in the drawings and the description thereof will be omitted. <Second embodiment (Fig. 4)> As shown in Figure 4, in the backfilling system 5B of the second embodiment of the present invention, a variable throttle valve 14 (injection flow rate adjustment valve) is provided in place of the on-off valve 13 (Figure 3) in the injection pipe 12. An operator can adjust the injection flow rate of the backfilling material 4 by manually adjusting the opening of the variable throttle valve 14. During normal operation, the variable throttle valve 14 is fully open.

[0051] During the injection process of the backfill material 4, when the displacement measured by the displacement meter 31 reaches a predetermined magnitude and the alarm means 40 is activated, the operator closes the variable throttle valve 14. Preferably, the valve is closed gradually over a period of 5 to 30 seconds. By gradually reducing the injection flow rate rather than suddenly setting it to zero, it is possible to prevent the injection pipe 12 from bursting due to a sudden change in the injection flow rate. Incidentally, if the injection flow rate of the backfilling material 4 is suddenly reduced to 0, the injection pipe 12 may burst before or after the on-off valve 13 (FIG. 3) or near the injection pump 11. By reducing the injection flow rate of the backfilling material 4 and eventually reaching zero, the increase in the load applied to the support 21 can be suppressed, and the destruction of the support 21 can be prevented.

[0052] <Third embodiment (Fig. 5)> As shown in Fig. 5, in a backfilling system 5C according to a third embodiment of the present invention, a drain pipe 15 (drain path) branches off from the injection pipe 12. A drain flow rate adjustment valve 16 is provided in the drain pipe 15. The drain flow rate adjustment valve 16 is configured as a manual on-off valve or a variable throttle valve. Under normal conditions, the drain adjustment valve 16 is fully closed.

[0053] As shown by the two-dot chain line in Figure 5, an on-off valve 13 may be provided in the injection pipe 12 downstream of the branching portion of the drain pipe 15. Instead of the on-off valve 13, a variable throttle valve 14 (Figure 4) may be provided.

[0054] During the injection process of the backfill material 4, when the displacement measured by the displacement meter 31 reaches a predetermined magnitude and the alarm means 40 is activated, the worker opens the drain flow rate adjustment valve 16. It may be opened gradually over time. This allows some of the backfill material 4 to escape into the drain pipe 15 (drain path), reducing the injection flow rate into the backfill space 2 and preventing the destruction of the support 21.

[0055] Thereafter, the on-off valve 13 may be closed to stop the injection. In this case, the injection flow rate of the backfilling material 4 is temporarily reduced by the amount of the escape flow rate to the drain pipe 15 before the injection is stopped, so that the range of change in the injection amount when the injection is stopped can be reduced and the injection pipe 12 can be prevented from bursting.

[0056] <Fourth embodiment (FIG. 6)> As shown in Figure 6, in a backfilling system 5D according to a fourth embodiment of the present invention, a remotely controlled on-off valve 13A is provided in the injection pipe 12 of the injection system 10 instead of the manual on-off valve 13. The on-off valve 13A is opened and closed by remote control. The drive system of the on-off valve 13A may be electromagnetic or electric. During normal operation, the on-off valve 13A is in an open state.

[0057] The opening and closing of the on-off valve 13A is automatically controlled by a controller 33A (valve control means). The controller 33A is provided with a valve drive circuit 38 instead of the alarm drive circuit 37 (FIGS. 3 to 5). The valve drive circuit 38 is connected to the on-off valve 13A via a control signal line 38c. The on-off valve 13A and the controller 33A constitute a safety process part 32.

[0058] The safety processing part 32 of the fourth embodiment does not include the alarm emitting means 40 (FIGS. 3 to 5). Note that the fourth embodiment may also include the alarm emitting means 40, and the controller 33A may control the alarm emitting means 40 in addition to the on-off valve 13A.

[0059] When the backfilling material 4 is injected, the measured displacement information by the displacement meter 31 is input to the controller 33A. In the controller 33A, the CPU 35 determines whether or not the measured displacement has reached a predetermined magnitude. If it is determined that it has reached that magnitude, the CPU 35 outputs a control signal for the on-off valve 13A to the valve drive circuit 38. Based on this control signal, the valve drive circuit 38 outputs a drive signal to the on-off valve 13A. The drive signal closes the on-off valve 13A. This automatically stops the injection of the backfilling material 4 by remote control. As a result, the support 21 can be prevented from being destroyed by an excessive load.

[0060] <Fifth embodiment (FIG. 7)> As shown in Figure 7, in a backfilling system 5E according to a fifth embodiment of the present invention, a remotely controlled variable throttle valve 14A (injection flow rate adjusting valve) is provided in place of the on-off valve 13A (Figure 6) in the injection pipe 12 of the injection system 10. The opening of the variable throttle valve 14A is adjusted continuously or in stages by remote control. The drive system of the variable throttle valve 14A may be electromagnetic or electric. During normal operation, the variable throttle valve 14A is fully open.

[0061] The opening degree of the variable throttle valve 14A is automatically controlled by a controller 33A (valve control means). A valve drive circuit 38 of the controller 33A is connected to the variable throttle valve 14A via a control signal line 38c. The variable throttle valve 14A and the controller 33A constitute a safety processing unit 32.

[0062] Although the safety processing unit 32 of the fifth embodiment does not include the alarm means 40 (Figures 3 to 5), the fifth embodiment may also include the alarm means 40, and the controller 33A may also control the alarm means 40 in addition to the variable throttle valve 14A.

[0063] During the injection process of the backfilling material 4, measured displacement information by the displacement meter 31 is input to the controller 33A. In the controller 33A, the CPU 35 determines whether the measured displacement has reached a predetermined magnitude. When it is determined that it has reached a predetermined magnitude, the CPU 35 outputs a control signal for the variable throttle valve 14A to the valve drive circuit 38. Based on this control signal, the valve drive circuit 38 outputs a drive signal to the variable throttle valve 14A. The drive signal drives the variable throttle valve 14A in the closing direction. This automatically reduces the injection flow rate of the backfilling material 4. Preferably, injection is eventually stopped. As a result, it is possible to prevent the support 21 from being destroyed by an excessive load.

[0064] More preferably, the opening of variable throttle valve 14A is gradually reduced over a period of 5 to 30 seconds under the control of controller 33A. The opening may be reduced continuously without any steps, or may be reduced in multiple steps. Therefore, the injection flow rate is gradually reduced over time rather than reaching zero in one step. This prevents injection tube 12 from bursting due to a sudden change in the injection flow rate.

[0065] The timing to start the operation of gradually decreasing the opening of the variable throttle valve 14A may be before the measured displacement reaches the threshold value Δs. The opening of the variable throttle valve 14A may be decreased in accordance with an increase in the measured displacement. The final opening of the variable throttle valve 14A after the gradual reduction is not limited to being fully closed, but may be in a slightly open state.

[0066] <Sixth embodiment (FIG. 8)> As shown in Figure 8, in a backfilling system 5F according to a sixth embodiment of the present invention, a drain pipe 15 branches off from the injection pipe 12 of the injection system 10, and a remotely controlled drain flow rate adjustment valve 16A is provided in the drain pipe 15. The drain flow rate adjustment valve 16A may be an on-off valve that is opened and closed by remote control, or may be a variable throttle valve whose opening is adjusted continuously or in stages by remote control. The drive system of the drain flow rate adjustment valve 16A may be electromagnetic or electric. Under normal conditions, the drain flow rate adjustment valve 16A is fully closed.

[0067] Drain flow rate adjustment valve 16A is automatically controlled by a controller 33A (valve control means). A valve drive circuit 38 of controller 33A is connected to drain flow rate adjustment valve 16A via a control signal line 38d. Drain flow rate adjustment valve 16A and controller 33A constitute a safety processing unit 32.

[0068] Although the safety processing unit 32 of the sixth embodiment does not include the alarm means 40 (Figures 3 to 5), the sixth embodiment may also include the alarm means 40, and the controller 33A may also control the alarm means 40 in addition to the drain flow rate adjustment valve 16A.

[0069] When the backfill material 4 is injected, the measured displacement information by the displacement meter 31 is input to the controller 33A. In the controller 33A, the CPU 35 determines whether the measured displacement has reached a predetermined magnitude. If it is determined that it has reached a predetermined magnitude, the CPU 35 outputs a control signal for the drain flow rate adjustment valve 16A to the valve drive circuit 38. Based on this control signal, the valve drive circuit 38 outputs a drive signal to the drain flow rate adjustment valve 16A. The drive signal opens the drain flow rate adjustment valve 16A. The valve may be opened gradually over time. This allows a portion of the backfill material 4 to escape into the drain pipe 15, reducing the injection flow rate into the backfill space 2. As a result, destruction of the support 21 can be prevented.

[0070] 8, in the sixth embodiment, a remotely controlled on-off valve 13A may be provided in the injection pipe 12 downstream of the branch point of the drain pipe 15. After the drain flow rate adjustment valve 16A is opened, the on-off valve 13A may be closed by remote control from the controller 33A, thereby stopping the injection of the backfilling material 4. In this case, the injection flow rate of the backfilling material 4 is temporarily reduced by the amount of the escape flow rate to the drain pipe 15 before the injection is stopped, so that the range of change in the injection amount when the injection is stopped can be reduced and the injection pipe 12 can be prevented from bursting.

[0071] In place of the remotely controlled on-off valve 13A, a remotely controlled variable throttle valve 14A may be provided in the injection pipe 12 downstream of the branching portion of the drain pipe 15. Furthermore, instead of the remotely controlled on-off valve 13A, a manual on-off valve 13 or a manual variable throttle valve 14 may be provided. In response to the issuance of a warning by the warning means 40, an operator may close the on-off valve 13 or the variable throttle valve 14.

[0072] The support of the support device is not limited to a cross-shaped structure. <Seventh embodiment (FIG. 9)> As shown in FIG. 9 , in a shoring device 50 according to a seventh embodiment of the present invention, a shoring 51 is formed in a generally annular shape. The shoring 51 includes an annular frame 52 and a plurality of shoring members 53. Each shoring member 53 has a jack bolt 25 and is formed in a short rod shape. The plurality of shoring members 53 are arranged radially at intervals around the circumferential direction of the annular frame 52. Each of the shoring members 53, except for the upper shoring member 53A, is abutted against the inner surface of the rehabilitation pipe 3 via a wale 22. The shoring member 53A (upper end bracing portion) is passed through a through hole 3c in the top portion 3p of the rehabilitation pipe 3 and abuts against the top of the existing pipe 1. The upper shoring member 53A and the lower shoring member 53B constitute vertical load-bearing shoring members that extend along the vertical center line Lc of the shoring 51.

[0073] A displacement meter 31 is attached to the upper support 53A at a portion 53d directly below the top 3p of the rehabilitating pipe. A displacement meter main body 31b is fixed to the support 53A. A movable probe 31a protrudes upward from the main body 31b and is fixed against the inner surface of the top 3p of the rehabilitating pipe 3. This makes it possible to measure the displacement of the top 3p of the rehabilitating pipe relative to the support 51 when the backfill material 4 is injected. Based on the measurement information, safety measures can be taken to prevent the support 21 from being destroyed.

[0074] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention. For example, the support may be a single rod shape including the vertical load-bearing support 23 but not including the horizontal support 24 . In cases where the construction span is short, the number of supports in the support device may be only one. The displacement measurement site by the displacement meter 31 is not limited to the top 3p of the rehabilitating pipe 3, but may be a portion other than the top of the rehabilitating pipe 3. Displacement gauges 31 may also be provided on supports 21 other than support 21A. The displacement meter 31 does not necessarily have to be provided on the support 21. A dedicated support means separate from the support 21 may be installed inside the rehabilitating pipe 3, and the displacement meter 31 may be supported by the support means. The displacement of the rehabilitating pipe 3 at a position away from the support 21 in the pipe axis direction may also be measured.

[0075] Multiple injection holes 3d may be provided at intervals in the axial direction of the rehabilitating pipe 3. In this case, safety measures may be taken for each injection hole 3d. For example, a displacement meter 31 may be provided in the support 21 nearest each injection hole 3d, and when the measured displacement for each displacement meter 31 reaches a predetermined magnitude Δs, the injection of backfill material from the injection hole 3d nearest the support 21 on which the displacement meter 31 is provided may be stopped or the injection flow rate may be gradually reduced. Alternatively, when the measured displacement of at least one of the multiple displacement meters 31 reaches a predetermined magnitude Δs, the injection of backfill material from the multiple injection holes 3d may be stopped or the injection flow rate may be gradually reduced. [Industrial Applicability]

[0076] The present invention can be applied to, for example, the rehabilitation of deteriorated sewer pipes. [Explanation of symbols]

[0077] 1 Existing pipes 2 Backfill space 3 Rehabilitation pipe 3d injection hole 3c through hole 3p top 4 Backfill material 5 Backfilling System 5B, 5C, 5D, 5E, 5F Backfilling System 10 Injection system 11 Infusion pump 12 Injection tube 13 Manual on-off valve 13A Remotely controlled on-off valve 14 Manual variable throttle valve (injection flow rate adjustment valve) 14A Remotely controlled variable throttle valve (injection flow rate adjustment valve) 15 Drain pipe (drain line) 16 Manual drain flow control valve 16A Remotely controlled drain flow control valve 20 Shoring equipment 21 Shoring 21A Shoring closest to injection hole (shoring 1) 23d directly below part 30 Backfill management device 31 Displacement meter 32 Safety Processing Department 33 Controller (alarm control means) 33A Controller (valve control means) 40 Means of notification 41 Warning lamp 42 Alarm buzzer 43 Display 50 Shoring equipment 51 Shoring 53d directly below part

Claims

1. A backfilling method for injecting backfill material between a rehabilitation pipe installed in an existing pipe to be rehabilitated and the existing pipe, a step of installing a support structure in the rehabilitation pipe to restrict floating of the rehabilitation pipe; after said placement, initiating said injection; a step of measuring the displacement of the rehabilitating pipe by a displacement meter during the injection; a step of performing safety processing to prevent destruction of the support structure based on the displacement measured by the displacement meter; A backfilling method for rehabilitating existing pipes, comprising:

2. 2. The backfilling method according to claim 1, wherein the displacement of the top of the rehabilitating pipe is measured by the displacement meter.

3. A backfilling method according to claim 1, wherein the displacement of the rehabilitation pipe relative to the support is measured by the displacement meter.

4. The backfilling method according to claim 1, wherein the displacement of the rehabilitating pipe near the backfilling material injection hole formed in the rehabilitating pipe is measured by the displacement meter.

5. The backfilling method according to any one of claims 1 to 4, wherein the safety processing includes issuing an alarm by emitting an alarm light, sounding an alarm, displaying an alarm, or displaying a displacement amount.

6. The backfilling method according to any one of claims 1 to 4, wherein the safety treatment includes an operation of gradually reducing the injection flow rate of the backfilling material.

7. The backfilling method according to any one of claims 1 to 4, wherein the safety treatment includes an operation of releasing a portion of the backfilling material into a drain pipe.

8. A backfill management device that manages the injection of backfill material between an existing pipe and the rehabilitation pipe, which is carried out in a state where a rehabilitation pipe is installed in an existing pipe to be rehabilitationd and a support that restricts the floating of the rehabilitation pipe is installed in the rehabilitation pipe, a displacement meter for measuring the displacement of the rehabilitating pipe during the injection; a safety processing unit that performs safety processing to prevent destruction of the support structure based on the displacement measured by the displacement meter; A backfill management device comprising:

9. A backfill management device as described in claim 8, wherein the displacement meter is installed directly below the top of the rehabilitation pipe in the support and measures the displacement of the top relative to the support.

10. Support structures are installed at multiple positions apart in the pipe axis direction of the rehabilitation pipe, The backfill management device according to claim 8, wherein the displacement meter is provided on the support closest to the backfill material injection hole formed in the rehabilitation pipe.

11. A backfill management device according to any one of claims 8 to 10, wherein the safety processing part includes an alarm means having at least one of an alarm lamp, an alarm buzzer, and a display.

12. The backfill management device according to any one of claims 8 to 10, wherein the safety processing unit includes an injection flow rate control valve provided in the backfill material injection pipe and a valve control means for remotely operating the injection flow rate control valve.

13. A backfill management device as described in any one of claims 8 to 10, wherein the safety treatment unit includes a drain flow control valve provided in a drain pipe branched from the backfill material injection pipe, and a valve control means for remotely operating the drain flow control valve.

14. A backfilling system that injects backfill material between a rehabilitation pipe installed in an existing pipe to be rehabilitated and the existing pipe, an injection system having an injection pump for the backfill material and an injection pipe extending from the injection pump; a support structure installed in the rehabilitation pipe to restrict the floating of the rehabilitation pipe; a displacement meter for measuring the displacement of the rehabilitating pipe during the injection; a safety processing unit that performs safety processing to prevent destruction of the support structure based on the displacement measured by the displacement meter; A backfilling system comprising:

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