Mud recovery system

Abstract

To provide a mud recovery system that achieves downsizing of a suction device and easy routing of a hose.SOLUTION: A mud recovery system S includes: a mud recovery head 1 for recovering mud accumulated under the floor; a mud recovery container 20 connected to the mud recovery head through a first hose 10, in which mud is recovered; a discharge pump 30 provided inside the mud recovery container for discharging the mud recovered in the mud recovery container; a suction device 60 connected to the mud recovery container through a second hose 40; and a mud recovery box 70 connected to the discharge pump through a third hose 50, in which mud is recovered. The mud recovery container 20 is arranged at a position near the underfloor. The suction device 60 performs a suction operation to recover the mud accumulated under the floor in the mud recovery container 20 through the mud recovery head 1 and the first hose 10. The discharge pump 30 performs a discharge operation to recover the mud recovered in the mud recovery container 20 in the mud recovery box 70 through the third hose 50.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a mud recovery system, and particularly to a mud recovery system used for recovering mud accumulated under the floor of a building.

Background Art

[0002] Conventionally, floods have occurred due to typhoons, heavy rainfalls, etc., and floor flooding or above-floor flooding has occurred in buildings such as houses. The river water and rainwater that have invaded under the floor contain fine particles of neighboring mud, and it is necessary to remove the mud (muddy water) accumulated under the floor, but this work is extremely laborious. Therefore, a mud recovery system for recovering mud accumulated under the floor of a building using a suction device such as a vacuum cleaner is known.

[0003] In the mud recovery system, specifically, a suction device and a large mud recovery box are installed outside the building in a state where they are connected by a hose. Then, the hose is extended from outside the building to under the floor inside the building, and the mud recovery head at the tip of the hose is operated to suck the mud accumulated under the floor. The mud sucked by the mud recovery head is recovered into the mud recovery box. For example, Patent Document 1 discloses a sludge recovery device for efficiently recovering sludge staying in a predetermined area, although it is not used for recovering mud accumulated under the floor of a building.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in a mud recovery system used to recover mud accumulated under the floor of a building, it has been difficult to install a large suction device and a mud recovery container near the building. Especially during disasters, since there are many damaged items placed, it has been even more difficult to install a large suction device and a mud recovery container near the building. When installing the suction device and the mud recovery container at a location far from the building, the hose becomes long, and the handling of the hose may become complicated. Also, when sucking up and recovering the mud accumulated under the floor of the building, it is necessary to set the suction force of the suction device high, and it has been difficult to use a general suction device. Therefore, there has been a demand for a technology that can recover the mud accumulated under the floor with a simpler configuration than before. For example, even when using a relatively small suction device (a vacuum cleaner), there has been a demand for a technology that can suck the mud from under the floor and recover the mud in a mud recovery container.

[0006] The present invention has been made in view of the above problems, and an object of the present invention is to provide a mud recovery system that can recover the mud accumulated under the floor with a simpler configuration than before. Another object of the present invention is to provide a mud recovery system that achieves miniaturization of the suction device and facilitates the handling of the hose.

Means for Solving the Problems

[0007] The above problem is solved by a mud recovery container of the present invention, which is a mud recovery system used when recovering mud accumulated under a building floor. The mud recovery system includes a mud recovery head for recovering the mud accumulated under the floor, a mud recovery container connected to the mud recovery head through a first hose for collecting mud inside, a suction device connected to the mud recovery container through a second hose, a discharge pump provided in the mud recovery container for discharging the mud collected in the mud recovery container, and a mud recovery box connected to the discharge pump through a third hose and formed larger than the mud recovery container for collecting mud inside. The mud recovery container is arranged at a position closer to the floor under the building than the mud recovery box. The suction device performs a suction operation to suck the mud accumulated under the floor into the mud recovery container through the mud recovery head and the first hose. The discharge pump performs a discharge operation to discharge the mud collected in the mud recovery container into the mud recovery box through the third hose.

[0008] With the above configuration, it is possible to realize a mud recovery container that can recover the mud accumulated under the floor with a simpler configuration than before. Specifically, the above mud recovery container is arranged at a position closer to the floor under the building than the mud recovery box. Therefore, the routing of the hoses can be made simpler than before (the length of each hose can be shortened). Also, when pumping up mud from under the floor, the suction force of the suction device can be set smaller. For example, a small-sized suction device can be used. By doing so, a mud recovery system with a simple configuration can be realized. Further, the discharge pump is provided in the mud recovery box and performs a discharge operation to discharge the mud collected in the mud recovery container into the mud recovery box. Therefore, the mud accumulated under the floor can be transferred to the mud recovery container by the suction operation of the suction device, and the mud collected in the mud recovery container can be transferred to the mud recovery box by the discharge operation of the discharge pump. By doing so, even when the suction force of the suction device is reduced, the mud can be suitably collected in the mud recovery box.

[0009] At this time, the sludge collection container is arranged indoors in the building, temporarily collects the sludge, the suction device is arranged indoors or outdoors in the building, the discharge pump is arranged inside the sludge collection container, and the sludge collection box is preferably arranged outdoors in the building. As described above, by arranging the sludge collection container indoors in the building, the handling of the hose can be made shorter, and the suction force of the suction device can be set smaller. For example, when the sludge collection container is installed under the floor indoors, the lift (suction lift) can be lowered when sucking the sludge accumulated under the floor into the sludge collection container. In this way, even when the suction force of the suction device is set smaller, the sludge can be suitably collected in the sludge collection container.

[0010] At this time, a check valve for preventing the backflow of the sludge is attached to the discharge pump or the third hose. The check valve enables the sludge collected in the sludge collection container to be transferred to the sludge collection box, and prevents the sludge collected in the sludge collection box from being transferred to the sludge collection container. By providing the check valve as described above, the sludge collection system can prevent the sludge from flowing back from the sludge collection box to the sludge collection container, and can suitably collect the sludge accumulated under the floor of the building.

[0011] At this time, a sludge detection unit is provided which is attached to the sludge collection container and detects that the amount of sludge collected in the sludge collection container has reached a predetermined amount or more. The discharge pump operates based on the detection result by the sludge detection unit, and discharges the sludge collected in the sludge collection container. With the above configuration, the sludge collection system can be made to function automatically or semi-automatically, and the sludge accumulated under the floor of the building can be suitably collected into the sludge collection box via the sludge collection container.

[0012] At this time, the mud collection container has a first hose connection portion connected to the first hose, the discharge pump has a pump suction port for sucking the mud collected in the mud collection container, the first hose connection portion is disposed at a position above the mud detection portion, and the pump suction port is preferably disposed at a position below the mud detection portion. As described above, by disposing the first hose connection portion at a position above the mud detection portion, the air in the mud collection container can be suitably sucked. Specifically, it is possible to suppress sucking the mud collected in the mud collection container. Also, as described above, by disposing the pump suction port at a position below the mud detection portion, when a predetermined amount of mud has accumulated in the mud collection container, the mud can be discharged (the pump can be prevented from idling).

[0013] At this time, the mud collection box preferably has a filter for separating the mud collected in the mud collection box into solids and liquid, and a liquid container for collecting the liquid separated by the filter. With the above configuration, the mud collected in the mud collection box can be separated, and the separated liquid (filtrate) can be reused. For example, when the mud accumulated under the floor has solidified, the mud can be dissolved using the liquid (filtrate), and the mud (muddy water) can be efficiently recovered.

[0014] At this time, the liquid container of the mud collection box is connected to the mud collection head through a fourth hose, and the mud collection box is preferably configured to be able to transfer the liquid collected in the liquid container to the mud collection head. With the above configuration, the liquid (filtrate) stored in the liquid container of the mud collection box can be transferred to the mud collection head, and the mud accumulated under the floor can be recovered while dissolving the mud using the liquid.

Advantages of the Invention

[0015] According to the mud recovery system of the present invention, it is possible to recover the mud accumulated under the floor with a simpler configuration than before. In addition, according to the mud recovery system of the present invention, it is possible to reduce the size of the suction device and facilitate the handling of the hose.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Modes for Carrying Out the Invention

[0017] Hereinafter, embodiments according to the present invention will be described with reference to FIGS. 1 to 4. This embodiment relates to a "mud recovery system" that is a system for recovering mud accumulated under the floor, achieving miniaturization of the suction device, and facilitating the handling of the hose.

[0018] <mud recovery system> As shown in FIG. 1, the mud recovery system S1 is used when a flood occurs due to a typhoon, heavy rain, etc., and when under-floor flooding or above-floor flooding occurs in a building B such as a house. Specifically, the mud recovery system S1 is used to efficiently recover the mud M (which may be muddy water) accumulated in the under-floor B2 (under-floor space) located under the floor B1 of the building B.

[0019] Note that "flooding above the floor" means a flooding state where the water level is above the floor of the building (residence) and exceeds 45 cm in height from the ground. "Flooding below the floor" means a state where the foundation of the building is flooded and the flooded position is at a height not exceeding 45 cm from the ground. For example, according to the law, the height of the floor of the building needs to be 45 cm or more from the ground surface directly below to the upper surface of the floor. The "mud (muddy water)" accumulated under the floor contains a large amount of relatively fine particles (clay and silt). Therefore, if the lift (suction lift) can be minimized when sucking the mud accumulated under the floor, the suction force of the suction device can be set small. For example, a household suction device (vacuum cleaner) can be used to suck the mud.

[0020] Specifically, the mud recovery system S1 includes a mud recovery head 1 installed under the floor B2 of the building B, a first hose 10, a mud recovery container 20, a discharge pump 30, a second hose 40 extending from under the floor B2 of the building B to the outside, a third hose 50, a suction device 60 installed outside the building B, a mud recovery box 70, and a generator 80.

[0021] As shown in FIG. 1, the mud recovery head 1 is a hollow head member connected to the tip of the first hose 10 and sucks the mud M accumulated under the floor B2 with the suction operation of the suction device 60. Specifically, the mud recovery head 1 has a hollow head body 2, a head port 3 provided at the tip of the head body 2, and a hose connection portion 4 provided at the end of the head body 2 and connected to the first hose 10.

[0022] As shown in FIGS. 1 and 2, the first hose 10, the second hose 40, and the third hose 50 are transfer hoses (transfer pipes) for transferring air and mud M (muddy water). The first hose 10 is mainly a hose for passing the mud M accumulated under the floor B2 and connects the mud recovery head 1 and the mud recovery container 20. The second hose 40 is mainly a hose for discharging the air in the mud recovery container 20 and connects the mud recovery container 20 and the suction device 60. The third hose 50 is a hose that mainly passes the mud M temporarily collected in the mud collection container 20 to the mud collection box 70, and connects the mud collection container 20 (discharge pump 30) and the mud collection box 70. As shown in FIG. 1, the first hose 10 extends along the floor B2 of the building B. The second hose 40 and the third hose 50 pass through the floor opening B3 from the floor B2 and extend from the inside of the building B to the outside.

[0023] A check valve 51 for preventing the backflow of the mud M is attached to the third hose 50. The check valve 51, also called a non-return valve or a reflux prevention valve, is a valve that enables the mud M collected in the mud collection container 20 to be transferred to the mud collection box 70, and prevents the mud M collected in the mud collection box 70 from being transferred to the mud collection container 20. As described above, by attaching the check valve 51 inside the mud collection container 20 that becomes a vacuum container (sealed container), the inside and outside of the check valve 51 can be set to the same pressure (equivalent pressure). Note that check valves may also be attached to the first hose 10 and the second hose 40.

[0024] As shown in FIGS. 1 and 2, the mud collection container 20 is a box-shaped container (sealed container) and has a size that can be installed on the floor B2 of the building B. For example, it has a height of about 30 to 50 cm so as to fit in the floor B2, and a length of about 40 to 60 cm both vertically and horizontally so as to pass through the floor opening B3. In the mud collection container 20, air inside the container body 21 is discharged through the second hose 40 by the suction operation of the suction device 60, and the mud M is sucked through the first hose 10, so that the mud M can be collected inside.

[0025] The mud collection container 20 has a container body 21 for collecting the mud M, a lid portion 22 that covers the container body 21 from above, a first hose connection portion 23 connected to the first hose 10, a second hose connection portion 24 connected to the second hose 40, and a third hose connection portion 25 connected to the third hose 50. Inside the mud recovery container 20, a discharge pump 30 for discharging the mud recovered in the container body 21 and a mud detection sensor 35 for detecting that the recovery amount of the mud M recovered in the container body 21 has reached a predetermined amount or more are attached.

[0026] The mud recovery container 20 temporarily recovers the mud M inside while making the inside of the container body 21 in a vacuum state (low vacuum state) by the suction operation of the suction device 60. The first hose connection part 23 is attached to the upper part of the side part of the container body 21. The second hose connection part 24 is attached to the upper part (lid part 22) of the container body 21 in order to preferably discharge the air inside the container body 21. The third hose connection part 25 is attached to the lower part of the side part of the container body 21 in order to preferably discharge the mud M accumulated in the container body 21.

[0027] As shown in FIGS. 1 and 2, the discharge pump 30 is a small pump and is installed at the bottom inside the mud recovery container 20. The discharge pump 30 operates to discharge the mud M recovered in the mud recovery container 20 to the inside of the mud recovery box 70 through the third hose 50. The discharge pump 30 has a pump body 31, a pump suction port 32 provided in the pump body 31 for sucking the mud M, and a pump discharge port 33 for discharging the mud M. The discharge pump 30 operates (starts operating) based on the first detection result by the mud detection sensor 35 and discharges the mud M recovered in the mud recovery container 20. Also, the discharge pump 30 stops operating based on the second detection result by the mud detection sensor 35.

[0028] The mud detection sensor 35 is, for example, a float sensor (also referred to as a float switch or a level sensor), and is arranged at a predetermined height position inside the mud recovery container 20. Specifically, the mud detection sensor 35 is attached to the upper part of the discharge pump 30 (pump body 31). Note that the mud detection sensor 35 may be a detector (detection part) other than the float sensor. The sludge detection sensor 35 is connected to the discharge pump 30 through communication, detects that the recovered amount of sludge M has reached a predetermined amount, and transmits a detection signal to the discharge pump 30. Specifically, the sludge detection sensor 35 includes a start sensor unit 35a (start float) and a stop sensor unit 35b (stop float).

[0029] When the start sensor unit 35a detects that the recovered amount of sludge M has reached a predetermined amount (equal to or more than the predetermined amount), the discharge pump 30 starts to discharge the sludge M recovered in the sludge recovery container 20. On the other hand, when the stop sensor unit 35b detects that the recovered amount of sludge M has reached a predetermined amount (equal to or less than the predetermined amount), the discharge pump 30 stops discharging the sludge M. More specifically, the start sensor unit 35a and the stop sensor unit 35b are automatic alternating type float switches. That is, when the water level of the sludge (slurry) rises and the start sensor unit 35a operates (when the start float rises), the discharge pump 30 starts. Then, when the water level of the sludge (slurry) drops and the stop sensor unit 35b operates (when the stop float drops), the discharge pump 30 stops.

[0030] As shown in FIG. 1, the suction device 60, also referred to as a vacuum device, is a device that performs a suction operation by receiving power supply from the generator 80. The generator 80 generates electricity by, for example, electromagnetic induction, supplies electricity to the suction device 60, and is installed outdoors of the building B together with the suction device 60. The suction device 60 performs a suction operation to recover the sludge M accumulated under the floor B2 into the sludge recovery container 20 through the sludge recovery head 1 and the first hose 10. In the suction device 60, for example, the operation is turned on and off manually, and the set value of the suction pressure (vacuum pressure) is also operated.

[0031] As shown in FIG. 1, the sludge recovery box 70 is formed larger than the sludge recovery container 20 and is used to recover the sludge M inside. For example, it is a sludge recovery box like a drum can. The sludge recovery container 20 temporarily stores the sludge M, and the sludge recovery box 70 transfers and collects the sludge M from the sludge recovery container 20. The sludge recovery box 70 includes a box body 71, a lid portion 72, a third hose connection portion 73 connected to the third hose 50, a sludge container 74 set inside the box body 71, a filter 75 disposed inside the sludge container 74, and a liquid container 76 set directly below the sludge container 74.

[0032] The filter 75 is, for example, a filter bag (earth bag), which separates the sludge collected in the sludge container 74 into solids (such as clay and silt) and liquid. The liquid container 76 collects the liquid (filtrate) separated by the filter 75 and can be detachably removed from the box body 71. For example, the liquid container 76 filled with liquid (filtrate) can be carried to under the floor of the building B. By doing so, when the sludge M accumulated under the floor has solidified, the sludge can be dissolved using the above liquid (filtrate), and the sludge (slurry) can be efficiently recovered. Note that filter media may be placed inside the sludge container 74.

[0033] In the above configuration, as shown in FIG. 1, in the sludge recovery system S1, a small sludge recovery container 20 is installed under the floor B2 of the building B. Therefore, the length of the hose can be shortened compared to the conventional case (the length of each hose can be shortened using a plurality of hoses), and the handling of the hose can be facilitated. That is, it is possible to avoid the hose becoming heavy due to the addition of the weight of the sludge as the length of a single hose increases. Also, by providing the sludge recovery container 20 and the sludge recovery box 70, the lift (suction lift) can be reduced when sucking the sludge M accumulated under the floor B2 into the sludge recovery container 20. Therefore, even when the suction force of the suction device 60 is set low, the sludge M can be suitably recovered. For example, it is also possible to use a household suction device (100V voltage specification) instead of a commercial suction device (200V voltage specification).

[0034] In the above configuration, as shown in FIG. 2, the suction device 60 operates to suck air inside the mud collection container 20, and the discharge pump 30 operates to discharge the mud M inside the mud collection container 20 to the mud collection box 70. In this way, by sharing the functions of the suction device 60 (mainly the function of discharging air) and the discharge pump 30 (mainly the function of discharging mud), the mud M accumulated under the floor can be efficiently recovered.

[0035] In the above configuration, as shown in FIG. 2, the first hose connection portion 23 and the second hose connection portion 24 are disposed at a position above the mud detection sensor 35. Therefore, the air inside the mud collection container 20 can be preferably sucked. Specifically, it is possible to suppress sucking the mud collected in the mud collection container 20.

[0036] In the above configuration, as shown in FIG. 2, the discharge pump 30 is disposed at the central portion (center portion) of the mud collection container 20. And the pump suction port 32 is disposed at a position below the mud detection sensor 35. Therefore, when a predetermined amount of mud has accumulated in the mud collection container 20, the mud can be preferably discharged. That is, it is possible to suppress the discharge pump 30 from idling.

[0037] <Method for Recovering Mud by Mud Recovery System> Next, a method for recovering mud by the mud recovery system S1 will be described with reference to FIGS. 1 and 2. For example, when the suction device 60 is turned on by an operator's operation, the mud recovery system S1 starts recovering the mud M accumulated under the floor. Specifically, the suction device 60 operates to suck the mud accumulated under the floor into the mud collection container 20 through the first hose 10.

[0038] When the mud detection sensor 35 (activation sensor unit 35a) detects that the mud M collected in the mud collection container 20 has reached a predetermined amount (first predetermined amount), the discharge pump 30 operates to discharge the mud M collected in the mud collection container 20. That is, until a predetermined amount of mud M accumulates in the mud collection container 20, the discharge pump 30 is stopped, and the mud M will accumulate in the mud collection container 20.

[0039] Then, the mud M accumulated under the floor is transferred to the mud collection container 20 by the suction device 60, and the mud M accumulated in the mud collection container 20 is transferred to the mud collection box 70 by the discharge pump 30, thereby recovering the mud M accumulated under the floor. As the mud M recovery operation progresses, when the mud detection sensor 35 (stop sensor unit 35b) detects that the mud M accumulated in the mud collection container 20 has reached a predetermined amount (the second predetermined amount), the discharge pump 30 stops its discharge operation. Then, when the suction device is turned off by the operator's operation, the mud recovery operation (mud recovery method) by the mud recovery system S1 is terminated.

[0040] In addition, when there are circumstances such that the mud M accumulated under the floor cannot be continuously recovered, the mud M may accumulate again in the mud collection container 20 up to a predetermined amount (the first predetermined amount). In that case, the discharge pump 30 resumes its discharge operation. That is, based on the amount of mud recovered in the mud collection container 20, the discharge pump 30 operates ON or OFF.

[0041] With the above-described mud recovery system S1 (mud recovery method using the mud recovery system S1), the mud accumulated under the floor can be recovered with a simpler configuration than in the past. In addition, the suction device can be miniaturized, and the handling of the hose can be facilitated.

[0042] <Second Embodiment> Next, the mud recovery system S2 of the second embodiment will be described with reference to FIGS. 3 and 4. Note that the description of the content overlapping with the above-described mud recovery system S1 will be omitted.

[0043] The mud recovery system S2 includes a mud recovery head 101 installed under the floor of the building B, a first hose 110 extending from under the floor to above the floor, a mud recovery container 120, a discharge pump 130, a second hose 140, suction devices 160A and 160B installed above the floor of the building B, a third hose 150 extending from above the floor to the outside of the building, a mud recovery box 170, and a transfer pump 177 installed outside the building B. The mud recovery system S2 further includes a fourth hose 180 connecting the mud recovery head 101 and the mud recovery box 170.

[0044] A backflow prevention valve 151 is attached to the pump discharge port of the discharge pump 130. The suction devices 160A and 160B can receive power supply from the building B.

[0045] As shown in FIG. 4, the mud recovery box 170 has a box body 171, a lid portion 172, a third hose connection portion 173, a mud container 174, a filter 175, a liquid container 176, and a transfer pump 177. The transfer pump 177 is installed inside the liquid container 176. The transfer pump 177 operates to transfer the liquid (filtrate) collected in the liquid container 176 to the mud recovery head 101 through the fourth hose 180. With the above configuration, the liquid (filtrate) stored in the liquid container 176 of the mud recovery box 170 can be transferred to the mud recovery head 101, and the mud M accumulated under the floor can be recovered while dissolving the liquid.

[0046] Even with the above-described mud recovery system S2, the suction device can be miniaturized, the hose handling can be facilitated, and the mud accumulated under the floor can be suitably recovered.

[0047] <Other Embodiments> In the above embodiment, as shown in FIG. 1, the mud recovery container 20 is installed under the floor B2 of the building B, but it is not particularly limited and may be installed above the floor of the building B. That is, the mud recovery container 20 may be installed at a position closer to the underfloor B2 than the mud recovery box 70.

[0048] In the above embodiment, the operator manually operates the suction operation of the suction device 60, but it is not particularly limited. For example, the mud recovery system S1 may further include an information processing device, and the mud recovery operation may be performed automatically or semi-automatically under the control of the information processing device.

[0049] In the above embodiment, as shown in FIGS. 1 and 2, the mud recovery system S1 includes a mud detection sensor 35 for turning on or off the operation of the discharge pump 30, but the mud detection sensor 35 may not be provided. For example, the operation of the discharge pump 30 may be turned on or off manually.

[0050] In the above embodiment, the mud recovery system according to the present invention has been mainly described. However, the above embodiment is merely an example for facilitating the understanding of the present invention and does not limit the present invention. The present invention can be changed and improved without departing from its gist, and it goes without saying that the equivalents of the present invention are included therein. In particular, what has been described in the above embodiment is merely an example and does not limit the present invention.

Explanation of Reference Numerals

[0051] S1, S2 Mud recovery system 1, 101 Mud recovery head 2 Head body 3 Head opening 4 Hose connection part 10, 110 First hose (first hose) 20, 120 Mud recovery container 21 Container body 22 Lid part 23 First hose connection part 24 Second hose connection part 25 Third hose connection part 30, 130 Discharge pump 31 Pump body 32 Pump suction port 33 Pump discharge port 35, 135 Mud detection sensor (mud detection section) 35a Activation sensor section 35b Stop sensor section 40, 140 Second hose (second hose) 50, 150 Third hose (third hose) 51, 151 Backflow prevention valve 60, 160A, 160B Suction device 70, 170 Mud collection box 71, 171 Box body 72, 172 Lid part 73, 173 Third hose connection part 74, 174 Mud container 75, 175 Filter 76, 176 Liquid container 177 Transfer pump 80 Generator 180 Fourth hose (fourth hose) B Building B1 Floor B2 Under the floor (under - floor space) B3 Under - floor opening M Mud (muddy water)

Claims

1. A mud recovery system used when recovering mud accumulated under the floor of a building, comprising: a mud recovery head for recovering the mud accumulated under the floor; a mud recovery container connected to the mud recovery head through a first hose and storing the recovered mud inside; a suction device connected to the mud recovery container through a second hose; a discharge pump provided in the mud recovery container for discharging the mud recovered in the mud recovery container; a mud recovery box connected to the discharge pump through a third hose, formed larger than the mud recovery container, and storing the mud inside; the mud recovery container is arranged at a position closer to the floor under the building than the mud recovery box; the suction device performs a suction operation to recover the mud accumulated under the floor into the mud recovery container through the mud recovery head and the first hose; the discharge pump performs a discharge operation to recover the mud recovered in the mud recovery container into the mud recovery box through the third hose. The mud recovery system is characterized by the above.

2. The mud recovery container is arranged indoors in the building and temporarily stores the mud. The suction device is arranged indoors or outdoors of the building. The discharge pump is arranged inside the mud recovery container. The mud recovery box is arranged outdoors of the building. The mud recovery system according to Claim 1 is characterized by the above.

3. A check valve for preventing the backflow of the mud is attached to the discharge pump or the third hose. The check valve: enables the mud recovered in the mud recovery container to be transferred to the mud recovery box; prevents the mud recovered in the mud recovery box from being transferred to the mud recovery container. The mud recovery system according to Claim 1 or 2 is characterized by the above.

4. The mud recovery container is provided with a mud detection unit for detecting that the recovered amount of the mud recovered in the mud recovery container has reached a predetermined amount or more. The discharge pump operates based on the detection result of the mud detection unit and discharges the mud recovered in the mud recovery container. The mud recovery system according to Claim 1 or 2 is characterized by the above.

5. The mud recovery container has a first hose connection part connected to the first hose. The discharge pump has a pump suction port for sucking the mud recovered in the mud recovery container. The first hose connection part is arranged at a position above the mud detection unit. The mud recovery system according to claim 4, wherein the pump suction port is disposed at a position lower than the mud detection unit.

6. The mud recovery system according to claim 1 or 2, wherein the mud recovery box includes a filter for separating the mud recovered in the mud recovery box into solids and liquid, and a liquid container for collecting the liquid separated by the filter.

7. The liquid container of the mud recovery box is connected to the mud recovery head through a fourth hose, The mud recovery system according to claim 6, wherein the mud recovery box is configured to be able to transfer the liquid collected in the liquid container to the mud recovery head.

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