JP7185274B2 - Method for repairing solid-liquid separation equipment and solid-liquid separation equipment - Google Patents

Description

The present invention relates to a method for repairing solid-liquid separation equipment having a groove-forming member at the bottom that forms a groove that opens upward, and to a solid-liquid separation equipment in which solids contained in received liquid settle to the bottom.

For example, in a sewage treatment plant, sewage such as sewage and rainwater is received, and sand contained in the sewage is allowed to settle in a groove formed by a groove forming member arranged at the bottom of the pond. Solid-liquid separation equipment, such as a settling basin, may be provided to collect sand deposited in the pit and remove it from the sewage. The settling basin is equipped with a screw conveyor arranged in the groove and a driving device for driving the screw conveyor as a transfer mechanism for transferring the sand accumulated in the groove to the sand collection pit. exist. As a settling basin equipped with this screw conveyor and driving device, for example, one described in Patent Document 1 is known. Hereinafter, the transfer mechanism of the method described in Patent Document 1 will be referred to as a screw conveyor type transfer mechanism. In recent years, a settling basin provided with a transfer mechanism having a transfer space forming member having an opening at the lower end thereof and a discharge port for discharging a fluid into the transfer space formed by the transfer space forming member. , which is described in Patent Document 2, has been developed. Hereinafter, the transport mechanism of the method described in Patent Document 2 will be referred to as an ejector-type transport mechanism. The opening of the transfer space forming member in this ejector-type transfer mechanism is provided in the groove where the sand settles, and the sand deposited in the groove is sucked into the transfer space by the flow of the fluid discharged from the discharge port. act as a mouth. Then, the sand sucked into the transfer space moves toward the sand collection pit on the downstream side in the transfer direction due to the flow of the fluid.

A settling basin equipped with a screw conveyor-type transfer mechanism drives the screw conveyor to collect sand in the sand collection pit, so the driving device of the screw conveyor wears out and needs to be replaced. Further, there is a possibility that dirt and the like may get caught in a driving force transmission device that is arranged between the driving device and the screw conveyor and that transmits the driving force to the screw conveyor, causing trouble. Furthermore, since the driving force transmission device is placed in dirty water, it may be damaged due to corrosion. As a result, the screw conveyor type transfer mechanism has a problem of high maintenance costs. On the other hand, a settling basin equipped with an ejector-type transfer mechanism does not have a driving device or a driving force transmission device, so there are few troubles and maintenance costs are low.

In addition to grit basins, solid-liquid separation equipment that sediments solids (such as metal powders) contained in received liquids to the bottom to separate liquids and solids is also used in sewage treatment plants. ing.

JP-A-2002-282607 JP-A-2015-361

In recent years, it has been desired to modify solid-liquid separation equipment equipped with a screw conveyor type transfer mechanism to a solid-liquid separation equipment equipped with an ejector type transfer mechanism at as low a cost as possible.

In view of the above circumstances, the present invention includes at least a method for repairing solid-liquid separation equipment with low repair costs, and solid-liquid separation equipment repaired by the repair method, and has unprecedented new effects Solid-liquid separation The purpose is to provide facilities.

The first method for repairing solid-liquid separation equipment of the present invention for solving the above object is to:
A method for repairing a solid-liquid separation facility having a groove-forming member at the bottom that forms a groove that opens upward,
a screw conveyor removing step of removing the screw conveyor arranged in the groove;
A discharge port for discharging fluid into an internal space defined by a hollow elongated space forming member having an opening at the bottom thereof and an inner peripheral surface of the space forming member in the groove from which the screw conveyor has been removed. and a transfer mechanism installation step for installing the
In the transfer mechanism installation step, the space forming member and the discharge port are maintained while maintaining the cross-sectional area of the groove from which the screw conveyor is removed to be equal to or greater than the cross-sectional area of the groove before the screw conveyor is removed. It is characterized by being a step of installing.

According to the first method for repairing solid-liquid separation equipment of the present invention, the solid deposited in the groove is removed without adding an arc-shaped groove forming member or concrete to the groove in which the screw conveyor is arranged. Since the solid-liquid separation equipment is modified to be transferred by a transfer mechanism having the space forming member and the discharge port, the solid-liquid separation equipment having a screw conveyor type transfer mechanism is changed to a solid-liquid separation device having an ejector type transfer mechanism. Modifications to equipment can be implemented at low cost.

The second solid-liquid separation equipment repair method of the present invention for solving the above object is as follows:
A method for repairing a solid-liquid separation facility having a groove-forming member at the bottom that forms a groove that opens upward,
a screw conveyor removing step of removing the screw conveyor arranged in the groove;
A groove inner peripheral surface protecting step of covering at least a part of the inner peripheral surface of the groove from which the screw conveyor has been removed with a protective material;
A discharge port for discharging fluid into an internal space defined by a hollow elongated space forming member having an opening at the bottom thereof and an inner peripheral surface of the space forming member in the groove from which the screw conveyor has been removed. and a transfer mechanism installation step for installing the

The protective material may be made of a material different from that of the groove forming member. Moreover, it is preferable that the protective material is replaceable or reworkable. Alternatively, the protective material may have a shape along the inner peripheral surface of the groove. Furthermore, the protective material may have the same thickness as the liner described below.

According to the second method for repairing solid-liquid separation equipment of the present invention, it is sufficient to cover at least a part of the inner peripheral surface of the groove in which the screw conveyor is arranged with the protective material, and the groove has an arc shape. There is no need for additional channel forming members, concrete, or the like. Therefore, according to the second method for repairing solid-liquid separation equipment of the present invention, the solid-liquid separation equipment equipped with the screw conveyor type transfer mechanism can be modified to the solid-liquid separation equipment equipped with the ejector type transfer mechanism at low cost. can. Furthermore, the inner peripheral surface of the groove covered with the protective material is protected from wear due to movement of solids.

In the first and second methods for repairing solid-liquid separation equipment, the phrases "placed in the groove" and "installed in the groove" refer to the member that was placed or the member that was installed. It is a concept including the case where a part of the member that is attached protrudes outside the groove.

Further, in the first and second methods for repairing solid-liquid separation equipment, a driving force transmission device for transmitting a driving force to the screw conveyor, which is arranged in a transmission device installation space connected to one end in the longitudinal direction of the groove. may have a transmission device removal step of removing the

If the driving force transmission device is left to remain, the driving force transmission device acts as a barrier to the movement of solids, and the solids accumulated around the driving force transmission device cannot move to the grooves and stay in the same position for a long time. There is a risk of staying in By including the step of removing the driving force transmission device, it is possible to prevent the solids deposited around the position where the driving force transmission device was disposed from remaining in the same position for a long period of time.

Furthermore, the first and second methods for repairing solid-liquid separation equipment may further include forming a sloped surface in the transmission device installation space that slopes downward toward the groove.

Since the inclined surface allows the solids that have settled in the transmission device installation space to slide down toward the groove, the solids that have slid down can be transferred by the ejector-type transfer mechanism. In addition, even if the solid deposited near the ejection port is deposited on the upstream side in the transfer direction from the ejection port, it is drawn into the internal space by ejecting the fluid from the ejection port. It can be transported by a type transport mechanism.

In the first and second methods for repairing solid-liquid separation equipment, the transfer mechanism installation step may be performed so that the shortest distance between the outer peripheral surface of the space forming member and the inner peripheral surface of the groove forming member is the space forming unit. The step of installing the space forming member at a position that becomes shorter along the outer peripheral surface from the upper end of the member toward the opening may be employed.

The groove may be widened to match the size of the screw conveyor. By installing the space forming member at a position where the shortest distance becomes shorter as it approaches the opening, the flow of solids toward the opening side at the lower end portion of the groove becomes faster than near the upper end of the space forming member. , even when the width of the groove is wide, it becomes easy to suck solid matter through the opening. As a result, it is possible to prevent solids from remaining in the grooves without being sucked through the openings.

Further, in the first and second methods for repairing solid-liquid separation equipment, the screw conveyor disposed on the inner peripheral surface of the groove forming member in the longitudinal central portion of the groove contacts and wears. You may have a liner removal process which removes a removable liner.

If the liner remains, the liner forms a step in the middle of the groove in the longitudinal direction, so there is a possibility that the solid may be dammed up by the step and remain in the stepped portion. By removing the liner, it is possible to prevent solids from remaining on the stepped portion.

In the second method for repairing solid-liquid separation equipment, without providing the liner removal step, the liner is left in the inner peripheral surface of the groove, and the area where the liner does not exist is removed from the liner. It may be covered with the protective material having the same thickness as the pressure. By doing so, the liner does not create a step, and solid matter can be prevented from remaining.

The solid-liquid separation equipment of the present invention that solves the above objects is
A solid-liquid separation facility in which the solids contained in the received liquid settle to the bottom,
a groove forming member provided on the bottom portion and having an arc-shaped inner peripheral surface;
a hollow space forming member extending along the longitudinal direction of the groove forming member and provided with an opening at the bottom;
a discharge port for discharging a fluid into an internal space defined by the inner peripheral surface of the space forming member;
The opening is arranged to face the arc-shaped inner peripheral surface of the groove forming member,
The space forming member is arranged such that the shortest distance between the outer peripheral surface of the space forming member and the inner peripheral surface of the groove forming member becomes shorter from the upper end of the space forming member toward the opening along the outer peripheral surface. and located in the groove formed by the groove forming member ,
a piping installation space connected to one end in the longitudinal direction of the groove formed by the groove forming member and having a piping for supplying fluid to the discharge port;
It is characterized in that a sloped surface directed downward toward the pipe installation space is provided on the opposite side of the groove with respect to the pipe installation space.

Further, the solid-liquid separation equipment has a piping installation space in which a piping connected to one end in the longitudinal direction of the groove formed by the groove forming member and supplying a fluid to the discharge port is arranged,
With respect to the pipe installation space, an inclined surface directed downward toward the pipe installation space may be provided on the side opposite to the groove.

Since the solids that have settled down on the inclined surface can be slid down toward the piping installation space, by discharging the fluid from the discharge port, the solids accumulated in the piping installation space are sucked into the internal space and transferred. be able to.

According to the present invention, a method for repairing a solid-liquid separation facility with a low repair cost, and a solid-liquid separation facility that includes at least the solid-liquid separation facility repaired by the repair method and has unprecedented new effects. can provide.

FIG. 3 is a plan view of a settling basin equipped with a screw conveyor type transfer mechanism; FIG. 2 is a cross-sectional view of the settling basin shown in FIG. 1 taken along the line AA. (a) is a BB cross-sectional view of the settling basin shown in FIG. 2. Moreover, (b) is a CC cross-sectional view of the settling basin shown in FIG. It is a top view of a settling basin provided with an ejector-type transfer mechanism. FIG. 5 is a cross-sectional view of the settling basin shown in FIG. 4 taken along line EE. (a) is a DD sectional view of the settling basin shown in FIG. Also, (b) is an EE cross-sectional view of the settling basin shown in FIG. FIG. 6 is a cross-sectional view of the settling basin shown in FIG. 5 taken along the line FF. 4A and 4B are diagrams showing several examples in which at least part of the inner peripheral surface 4a of the trough 4 is covered with a protective material; It is a flowchart which shows the flow of repair.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. A settling basin, which is one embodiment of the present invention, is a solid-liquid separation facility installed in a sewage treatment plant, which settles sand contained in wastewater such as sewage and rainwater, and then collects the settled sand. It is moved to a pit and removed from the sewage.

First, the settling basin equipped with a screw conveyor type transfer mechanism before renovation will be described. FIG. 1 is a plan view of a settling basin equipped with a screw conveyor type transfer mechanism.

A settling basin 1 equipped with a screw conveyor-type transfer mechanism shown in FIG. 1 receives wastewater such as sewage and rainwater from the right side in FIG. The received sewage flows slowly toward the left side of the drawing in this settling basin 1 while the sand contained in the sewage settles (see the straight arrow shown in FIG. 1). Hereinafter, the upstream side of the received sewage flow is simply referred to as the upstream side, and the downstream side of the sewage flow is simply referred to as the downstream side. At the upstream end of the grit basin 1, a dust remover (not shown) is provided for removing contaminants (screen residue) larger than a predetermined size, which are mixed in the sewage that has flowed into the grit basin 1. there is At the upstream end of the settling basin 1, there is also provided a gate (not shown) for selecting whether the settling basin 1 accepts or blocks sewage. A pump well (not shown) for storing sewage from which sand has been removed by the settling basin 1 is arranged downstream of the settling basin 1 . A pump is installed inside the pump well, and sewage sucked by the pump is sent to a sedimentation basin for the next stage of sewage treatment.

As shown in FIG. 1, the settling basin 1 is a substantially rectangular pond in plan view, which includes a sand collecting pit 2, a pond bottom surface 3, a trough 4, and a screw conveyor type transfer mechanism 5. As shown in FIG. In the upper part of the settling basin 1, two beams 9 are provided so as to block a part of the settling basin 1, and span across the settling basin 1 in the transverse direction. The sand collection pit 2 is provided in the downstream portion of the bottom of the settling basin 1 . The sand collection pit 2 is provided with a sand pump (not shown) for carrying out the sand in the sand collection pit 2 to the outside of the pond. The pond bottom 3 is a surface formed upstream of the sand collection pit 2 and on the left and right sides in the width direction of the pond, and is composed of the surface of concrete placed on the bottom of the settling basin 1 . The trough 4 is provided on the upstream side of the sand collection pit 2 and at the center in the pond width direction of the settling basin 1 at the bottom of the pond. The trough 4 of this embodiment corresponds to an example of a groove forming member. The bottom surface 3 of the pond is inclined downward as it approaches the trough 4 from both sides in the width direction of the pond, and is connected to the trough 4 at the bottom. A groove 41 opened upward is formed by the trough 4 . The longitudinal direction of the trough 4 , that is, the longitudinal direction of the grooves 41 coincides with the longitudinal direction of the settling basin 1 . The longitudinal length of the trough 4 in this embodiment is 5 m. A downstream end of the trough 4 is connected to the sand collection pit 2 . Most of the sand in the sewage that has flowed into the settling basin 1 settles toward the sand collection pit 2 , the pond bottom 3 , or the trough 4 . The sand that settles toward the pond bottom 3 slides down the inclined pond bottom 3 and accumulates in the groove 41. - 特許庁

A liner 42 is installed on the inner peripheral surface 4 a of the trough 4 at the central portion in the longitudinal direction of the groove 41 . The liner 42 is composed of a liner base 421 and a liner trough 422 . The liner base 421 is made of a high-strength steel plate with a thickness of 6 mm. Also, the liner trough 422 is formed of a high-strength steel plate having a thickness of 12 mm. In addition, each or one of the liner base 421 and the liner trough 422 may be formed of other materials such as highly wear-resistant resin. A liner trough 422 is fixed to the liner base 421 . The liner base 421 is provided with eight elongated holes 421a elongated in the vertical direction. The liner 42 is detachably attached to the pond bottom surface 3 by screwing a bolt (not shown) into the pond bottom surface 3 through the long hole 421a. By providing the elongated hole 421a which is elongated in the vertical direction, the liner 42 can be freely adjusted in its vertical mounting position. The liner trough 422 wears due to contact with the screw conveyor 51, which will be detailed later, when it bends. When the wear of the liner trough 422 exceeds a certain amount, the liner 42 can be replaced with a new one by removing the aforementioned bolts.

FIG. 2 is a cross-sectional view of the settling basin shown in FIG. 1 along the line AA. In addition, in FIG. 2, hatching indicating the cross section of the trough is omitted. Further, in FIG. 2, the flow direction of sewage is indicated by straight arrows.

As shown in FIG. 2 , the screw conveyor type transfer mechanism 5 has a screw conveyor 51 , a driving device 52 , a driving force transmission device 53 , a first coupling 54 and a second coupling 55 . The driving device 52 is composed of a motor 521 and a speed reducer 522 arranged on the beam 9 on the upstream side, and a drive shaft 523 extending from the speed reducer 522 toward the bottom of the pond. By driving the motor 521 , the drive shaft 523 rotates via the speed reducer 522 . The drive shaft 523 is connected to the driving force transmission device 53 by the first coupling 54 .

The driving force transmission device 53 is arranged in a transmission device installation space V1 connected to one longitudinal end of the groove 41 at the bottom of the pond. The transmission device installation space V<b>1 is a rectangular parallelepiped space provided upstream of the pond bottom 3 and the trough 4 . The driving force transmission device 53 is a device having a function of changing the driving direction and a deceleration function. The driving force transmission device 53 reduces the number of revolutions while converting the rotational motion about the shaft extending in the vertical direction into the rotational motion about the shaft extending in the longitudinal direction of the groove 41 . Part of the sand contained in the sewage settles in the transmission device installation space V1. Since the driving force transmission device 53 may be buried by the sedimented sand, the driving force transmission device 53 has a sandproof function.

The driving force transmission device 53 is connected to one end of the screw conveyor 51 by a second coupling 55 . Therefore, when the motor 521 is driven, the screw conveyor 51 rotates via the driving force transmission device 53 and the like. The screw conveyor 51 is a hollow shaft with helical blades on its circumference, which is arranged in the groove 41 . The screw conveyor 51 may be configured with a solid shaft having spiral blades around it. The axial direction of the screw conveyor 51 matches the longitudinal direction of the groove 41 . The other end of the screw conveyor 51 slightly protrudes into the sand collection pit 2 . The other end is supported by a bearing 511 arranged at a predetermined position. The bearing 511 is spanned between the left and right side walls of the settling basin 1 and supported by a support shaft 512 fixed to the side walls with bolts (not shown). As the screw conveyor 51 rotates, the blades around the screw conveyor 51 push sand accumulated in the groove 41 toward the sand collection pit 2 . As a result, sand deposited in the grooves 41 is transferred to the sand collection pit 2 . That is, the direction from the right side to the left side in FIG. 2 is the transfer direction of the sand.

FIG. 3(a) is a BB cross-sectional view of the settling basin shown in FIG. 3(b) is a cross-sectional view of the settling basin shown in FIG. 2 taken along the line CC. In these drawings, the direction from the back side to the front side of the drawing is the sand transfer direction. 3(a) and 3(b), hatching indicating the cross section of the trough is omitted.

As shown in FIG. 3(a), the trough 4 is made of a concrete flume having a U-shaped cross section. The trough 4 has a lower portion formed in a 1/2 arc with an inner diameter of 338 mm and an upper portion formed in a linear shape expanding outward by 2° in the groove width direction. Also, the trough 4 is fixed to the concrete placed in the pond bottom by three anchor bolts 411 . Only a part of the blades of the screw conveyor 51 protrude above the grooves 41 , but the rest of the blades are arranged within the grooves 41 . The blades of the screw conveyor 51 have an outer diameter of 320 mm. That is, the outer diameter of the screw conveyor 51 is slightly smaller than the inner diameter of the arc of the lower portion of the trough 4 . Therefore, a gap is formed between the blades of the screw conveyor 51 and the trough 4 . Further, the axial center of the screw conveyor 51 is positioned 13 mm above the center of a circle including the arc of the lower portion of the trough 4 as part of its circumference.

As described above, the liner 42 is installed on the inner peripheral surface 4a of the trough 4 at the central portion of the groove 41 in the longitudinal direction. As shown in FIG. 3B, the liner base 421 constituting the liner 42 covers the inner peripheral surface 4a of the trough 4, extends above the trough 4, and also covers the lower end portion of the bottom surface 3 of the pond. . The longitudinal central portion of the groove 41 in which the liner 42 is arranged and the portion from the upper end of the trough 4 to the vicinity of the upper end of the liner base 421 is compared with the portion other than the longitudinal central portion of the groove 41 shown in FIG. Then, the bottom surface 3 of the pond protrudes a little in the center. At this projecting portion, the liner base 421 is detachably fixed to the pond bottom surface 3 with bolts (not shown). The liner trough 422 is attached to the inner peripheral surface of the lower end of the liner base 421 . The screw conveyor 51 may bend downward due to its own weight or reaction force when transferring sand. When the deflection increases, the blades in the axially central portion of the screw conveyor 51 come into contact with the liner trough 422, and further deflection is suppressed. When the screw conveyor 51 rotates in the contact state, the liner trough 422 is worn. When the liner trough 422 is worn by a predetermined amount, maintenance can be easily performed by removing the above bolts and replacing the liner 42 .

Next, the refurbished settling basin equipped with an ejector transfer mechanism will be described. The grit collection pit 2, bottom 3, trough 4, and beam 9 of the settling basin 1 equipped with the screw conveyor type transfer mechanism 5 before the above-mentioned repair are used as they are after the repair. The reference numerals used are attached and the description thereof is omitted.

FIG. 4 is a plan view of a settling basin equipped with an ejector-type transfer mechanism. Since FIG. 4 shows the structure of the bottom of the settling basin, the beams above the settling basin are omitted. 5 is an EE cross-sectional view of the settling basin shown in FIG. In FIG. 5, hatching indicating the cross section of the trough is omitted. 4 and 5, the sand transfer direction is from the right side to the left side of the drawing. Further, in FIGS. 4 and 5, the flow direction of sewage is indicated by straight arrows.

As shown in FIG. 4, the refurbished settling basin 10 has an ejector type transfer mechanism 7 instead of the screw conveyor type transfer mechanism 5 of the settling basin 1 shown in FIGS. The ejector transfer mechanism 7 has a space forming member 71 , a support member 72 , a nozzle 73 and a nozzle pipe 74 . The space forming member 71 is a hollow elongated member having an opening at the bottom and extends along the longitudinal direction of the groove 41 . The length of the space forming member 71 in the extending direction is 5.05 m, and one end on the upstream side coincides with one end of the trough 4 . Therefore, the other end of the space forming member 71 is formed 0.05 m longer downstream than the other end of the trough 4, and the space forming member 71 protrudes into the sand collection pit 2 by that length. The space forming member 71 has a subspace forming portion 712 and a main space forming portion 711 provided at one end thereof. The cross-sectional shape of the subspace forming portion 712 is the same as the cross-sectional shape of the main space forming portion 711 . The sub space forming portion 712 has a significantly shorter length in the extending direction than the main space forming portion 711 . The sub-space forming part 712 and the main space-forming part 711 are detachably fastened by a fastening member 713 consisting of a bolt and a nut. Four supporting members 72 are provided at equal intervals in the extending direction of the space forming member 71 . The main space forming portion 711 is supported by the support member 72 so as to be arranged at a predetermined position within the groove 41 . The sub space forming portion 712 is not provided with the supporting member 72 and is supported by the main space forming portion 711 at a position connected to the main space forming portion 711 . An inner peripheral surface 711a (see FIG. 6A) of the main space forming portion 711 and an inner peripheral surface 712a (see FIG. 7) of the sub space forming portion 712 are continuous in the extending direction of the space forming member 71. As shown in FIG. A tip portion of the nozzle 73 is arranged in an internal space IS (see FIG. 7) defined by the subspace forming portion 712 . Since the sub space forming part 712 is detachably fastened to the main space forming part 711, for example, when the nozzle 73 is clogged, the sub space forming part 712 can be removed from the main space forming part 711 and the nozzle can be removed. By exposing 73, maintenance can be easily performed. Space formation member 71 and support member 72 will be described later in more detail.

The nozzle 73 is formed by flattening a round pipe from above and below, and a discharge port 73a formed at the tip thereof is formed to be long in the width direction of the pond and short in the vertical direction. Both ends in the extending direction of the space forming member 71 are open. The tip portion of the nozzle 73 is inserted into the internal space IS (see FIG. 7) from one open end. The discharge port 73a is arranged in the internal space IS, and discharges fluid in the extending direction of the space forming member 71 when transferring sand. The fluid discharged from the discharge port 73a is obtained by pumping up sewage stored in the settling basin 10 with a pump (not shown). However, water from other ponds, taps, or the like may be used as the fluid to be discharged from the discharge port 73a. This fluid may be a mixture of liquid and gas. Less is better. In this embodiment, the discharge pressure of the sewage discharged from the discharge port 73a is 0.09 MPa, and the amount of sprayed water is 1500 liters per minute. However, the discharge pressure may be 0.05 MPa or more and 0.3 MPa or less, and the injection water amount may be appropriately adjusted according to the length of the space forming member 71 . Moreover, the discharge flow rate of water is preferably 8 m/sec or more.

The nozzle pipe 74 is connected to the nozzle 73 . This nozzle pipe 74 is for supplying the above-described fluid to the nozzle 73 . As shown in FIG. 5, a flow control valve 741 and an electric valve 742 are installed in the upstream portion of the nozzle pipe 74 in the supply direction. In addition, in FIG. 5, the nozzle pipe 74 located upstream in the supply direction of the flow control valve 741 is omitted from the illustration. A part of the nozzle 73 and the supply direction downstream end portion of the nozzle pipe 74 are arranged in the transmission device installation space V1 (see FIG. 2) in which the driving force transmission device 53 was installed before the repair. Hereinafter, of the transmission device installation space V1, a space in which part of the nozzle 73 and the downstream end portion of the nozzle pipe 74 in the supply direction are arranged is referred to as a pipe installation space V3. The pipe installation space V3 is a rectangular parallelepiped that is smaller than the transmission device installation space V1. Further, the pipe installation space V3 is connected to one end of the groove 41 in the longitudinal direction. As shown in FIG. 4, in a portion of the space that was the transmission device installation space V1 excluding the pipe installation space V3, an inclined surface 8 is formed that faces downward toward the pipe installation space V3. It can be said that the inclined surface 8 is inclined downward as it approaches the groove 41 . The inclined surface 8 is composed of an upstream inclined surface 81 and left and right inclined surfaces 82 . The upstream inclined surface 81 is formed on the side opposite to the groove 41 with respect to the pipe installation space V3, and continues to the upstream side of the pipe installation space V3. The left and right inclined surfaces 82 are connected to both sides in the width direction of the pipe installation space V3. However, only the upstream inclined surface 81 may be formed as the inclined surface 8 without forming the left and right inclined surfaces 82 . When only the upstream inclined surface 81 is formed, it is desirable to extend the portion of the upstream inclined surface 81 outside the pipe installation space V3 in the pond width direction to the pond bottom surface 3 . The inclined surface 8 is composed of the surface with the placed concrete. In FIG. 5, cross-hatched cross-sections of the placed concrete are shown. By forming the inclined surface 8, the sand that has settled on the inclined surface 8 can slide down toward the pipe installation space V3. The inclination angle of the upstream inclined surface 81 and the inclination angle of the left and right inclined surfaces 82 are the same. Further, the inclination angle of the inclined surface 8 in this embodiment is gentler than the inclination angle of the pond bottom surface 3 (see FIG. 7), but these inclination angles may all be the same. The sand that slides down the inclined surface 8 and accumulates below the pipe installation space V3 is sucked into the internal space IS (see FIG. 7) and discharged into the internal space IS when the fluid is discharged from the discharge port 73a. It is transported towards the sand collection pit 2 by the flow of sewage. If the driving force transmission device 53 is removed and the transmission device installation space V1 is left as it is, the sand deposited on both sides of the transmission device installation space V1 in the pond width direction and the upstream end of the transmission device installation space V1 will be discharged. Since the fluid is far from the outlet 73a, even if the fluid is ejected from the ejection port 73a, it will remain without being sucked into the internal space IS. By forming the inclined surface 8, it is possible to prevent sand from remaining on those ends.

FIG. 6(a) is a DD sectional view of the settling basin shown in FIG. 6(b) is a cross-sectional view of the settling basin shown in FIG. 5 taken along line EE. 7 is a cross-sectional view of the settling basin shown in FIG. 5 taken along line FF. In these drawings, the direction from the back side to the front side of the drawing is the sand transfer direction. In FIG. 7, the inclined surface is indicated by a two-dot chain line, and the hatching indicating the cross section of the concrete forming the settling basin is omitted. 6(a), 6(b) and 7, hatching indicating the cross section of the trough is omitted.

As shown in FIG. 6A, the space forming member 71 has a cross-sectional shape of a 5/6 circle with an opening 71a at the lower end portion. That is, the cross-sectional shape of the space forming member 71 is in the shape of an arc formed by a part of a circle with the center 71c as the center point. The space forming member 71 is formed by molding a stainless plate material having a thickness of 3 mm into an arc shape having an inner diameter of 150 mm. The width of the opening 71a is 80 mm. This opening 71 a is provided over the entire length of the space forming member 71 . The opening 71a is arranged to face the lower end portion of the inner peripheral surface 4a of the trough 4, and functions as a suction port for sucking sand accumulated in the groove 41. As shown in FIG. The space forming member 71 partitions the inside of the groove 41 . The internal space IS formed by the space forming member 71 serves as a transfer space for transferring sand. Since the space forming member 71 has an arc-shaped cross section with the upper portion closed, the sand that settles toward the upper portion of the space forming member 71 in the settling basin 10 easy to slide off the outer surface of the Sand that slides down is deposited under the groove 41 . The internal space IS below the center 71c of the space forming member 71 narrows in the width direction toward the lower opening 71a. This makes it difficult for the sand sucked into the internal space IS to leak outside from the internal space IS. As described above, since the inner diameter of the arc of the lower portion of the trough 4 is 338 mm, the inner diameter of the lower portion of the trough 4 is at least twice the inner diameter of the space forming member 71 .

Supported portions 715 are fixed to the space forming member 71 at four locations at equal intervals in the extending direction of the space forming member 71 . The supported portion 715 is welded to the outer peripheral surface 71 b of the space forming member 71 . The supported portion 715 is used in combination with a supporting member 72 which will be described later. FIG. 6(a) shows one of the sets of the supported portion 715 and the support member 72. FIG. Since the other three supported portions 715 and the supporting member 72 have the same configuration, description of the other three supporting members 72 is omitted. The supported portion 715 is supported by the support member 72 . The support member 72 has a support plate 721 and two support screw shafts 722 . The support plate 721 is made of a stainless steel plate having an L-shaped cross section. The plate surface of the central portion 721a in the groove width direction in the lower portion of the support plate 721 is horizontal, and the plate surface of both end portions 721b in the groove width direction in the lower portion of the support plate 721 has the same inclination angle as the bottom surface 3 of the pond. Inclined. The support member 72 is fixed to the pond bottom surface 3 by bolts (not shown) passing through holes (not shown) provided at both end portions 721b in the groove width direction. Two elongated holes (not shown) elongated in the groove width direction are formed in the groove width direction central portion 721a, and the support screw shaft 722 penetrates the elongated holes. The support screw shaft 722 is a shaft with threads formed on the outer peripheral portion of the shaft. Two nuts 723 screwed to the support screw shaft 722 sandwich the central portion 721a in the groove width direction from above and below. Thus, the support screw shaft 722 is fixed to the support plate 721 so that the position in the vertical direction and the position in the groove width direction can be adjusted. The support screw shaft 722 also passes through a hole (not shown) formed in the upper end portion of the supported portion 715 . Two nuts 724 different from the nut 723 are screwed to the support screw shaft 722, and the nuts 724 sandwich the upper end portion of the supported portion 715 from above and below. As a result, the supported portion 715 is held by the support screw shaft 722 so that the position in the vertical direction can be adjusted. The space forming member 71 is fixed to the settling basin 1 by the supported portion 715 and the supporting member 72 so that the position in the vertical direction and the groove width direction can be adjusted. Note that the support screw shaft 722 may be fixed to one of the supported portion 715 and the support member 72 by welding or the like. Further, if it is not necessary to adjust the position of the space forming member 71 in the vertical direction and the groove width direction, the supported portion 715 and the supporting member 72 may be integrally formed. However, by adjusting the position where the space forming member 71 is arranged in the vertical direction and the groove width direction, when the space forming member 71 is installed, the position of the space forming member 71 in the height direction and the groove width direction can be changed. can be arbitrarily set at the construction site. Only one of the vertical position and the groove width direction of the space forming member 71 may be adjustable. Conversely, in addition to the vertical position and the groove width direction, the extension direction of the space forming member 71 may also be adjustable.

As described above, the cross-sectional shape of the trough 4 is such that the upper portion is linear and the lower portion is arcuate. Further, as described above, the cross-sectional shape of the space forming member 71 is an arc shape having the opening 71a at the lower end portion. In this embodiment, the center 71c of the circle including the arc as part of the circumference is positioned below the boundary line 41b between the linear portion of the trough 4 and the arcuate portion of the trough 4. there is With this arrangement, the shortest distance between the outer peripheral surface 71b of the space forming member 71 and the inner peripheral surface 4a of the trough 4 is from the upper end of the space forming member 71 along the outer peripheral surface 71b of the space forming member 71. It becomes shorter as it approaches 71a. When sewage is discharged from the outlet 73a (see FIG. 5) into the internal space IS formed by the space forming member 71, a flow of sewage is generated in the internal space IS. A pressure difference is generated between the internal space IS and the outside of the space forming member 71 due to the fluid flow. That is, a negative pressure is generated in the internal space IS in which the fluid flow is generated. Sand deposited in the groove 41 is sucked into the internal space IS through the opening 71a by the negative pressure. At this time, since the shortest distance between the outer peripheral surface 71b of the space forming member 71 and the inner peripheral surface 4a of the trough 4 becomes shorter as it approaches the opening 71a, the sand flowing toward the opening 71a at the lower end portion of the groove 41 does not reach the opening 71a. flow faster. As a result, sand can be easily sucked through the openings 71 a, and sand can be prevented from remaining in the grooves 41 . Further, when the trough 4 has a U-shaped cross-section, a large amount of sand can be deposited in the groove 41 compared with the case where the trough 4 has an arc-shaped cross-section. The sand sucked into the internal space IS is transferred toward the sand collection pit 2 by the flow of sewage generated within the internal space IS.

As shown in FIG. 7, the center of the ejection port 73a and the center 71c of the space forming member 71 are aligned. Further, the discharge direction of the sewage discharged from the center of the discharge port 73a and the extending direction of the space forming member 71 are the same. As a result, the sewage discharged from the discharge port 73a is less likely to spread in the radial direction orthogonal to the discharge direction. Further, the space forming member 71 prevents the sewage discharged from the outlet 73a from diffusing in directions other than the lower opening 71a, so that the flow of sewage is maintained within the internal space IS over a long distance.

As shown in FIG. 6(b), in the refurbished settling basin 10, the liner 42 that was present before the refurbishment has been removed, so that the inner peripheral surface 4a of the trough 4 is exposed in the longitudinal central portion of the groove 41 as well. ing. A protruding portion 3a protruding toward the center in the width direction of the pond is formed at the lower end portion of the bottom surface 3 of the pond where the liner 42 was attached before the repair. In this embodiment, the protruding portion 3a is left as it is, but it may be removed by scraping when removing the liner 42. FIG.

At least part of the inner peripheral surface 4a of the trough 4 may be covered with a protective material.

FIG. 8 shows several examples in which at least part of the inner peripheral surface 4a of the trough 4 is covered with a protective material.

FIG. 8(a-1) is a cross-sectional view of the bottom of the trough 4 taken along the longitudinal direction. 4 is a cross-sectional view taken in a direction crossing the longitudinal direction.

In this example, the liner 42 has been removed, and no new installation of the arc-shaped groove forming member or concrete placement has been performed, but the inner peripheral surface 4a of the trough 4 is provided with a protective material 61. there is This protective material 61 is a protective layer made of resin applied so as to cover the entire inner peripheral surface 4 a of the trough 4 . Therefore, the protective material 61 is provided above the upper end of the space forming member 71 . In addition, the protective member 61 may be provided higher than the trough 4 . The protective material 61 is provided along the inner peripheral surface 4a of the trough 4 and has the same shape as the inner peripheral surface 4a. It is conceivable that the inner peripheral surface 4a of the trough 4 is worn by the sand transferred by the ejector-type transfer mechanism 7, but by providing the protective material 61, the inner peripheral surface 4a of the trough 4 itself is not worn. You can prevent it from getting lost. When the protective material 61, which is a protective layer made of resin, is worn, the protective layer may be applied again. Repainting of the protective layer is cheaper than replacement of the trough 4, and provision of the protective material 61 reduces the maintenance cost.

FIG. 8(b-1) is also a sectional view of the bottom of the trough 4 taken along the longitudinal direction, and FIG. 8(b-2) is a trough whose bottom is shown in FIG. 4 is a cross-sectional view taken in a direction crossing the longitudinal direction.

In the examples shown in FIGS. 8(b-1) and 8(b-2), the liner 42 has not been removed, nor has a new arc-shaped groove forming member been installed or concrete has been poured. The protective member 62 in this example is a high-strength steel plate made of the same material as the liner trough 422, and is installed replaceably by, for example, bolting.

As shown in FIG. 8(b-2), a protective material 62 is provided so as to surround the liner trough 422 where the liner 42 is left, and the protective material 62 partially covers the liner base 421. As shown in FIG. The thickness of the protective material 62 shown in FIG. 8(b-2) is the same as the thickness of the liner trough 422. Therefore, there is no step with the liner trough 422, and sand can be prevented from remaining.

On the other hand, in the portion where the liner 42 is not provided, the protective material 62 is provided on the inner peripheral surface 4a of the trough 4 as shown in FIG. The thickness of the protective material 62 is the sum of the thickness of the liner base 421 and the thickness of the liner trough 422 . Therefore, there is no step with the liner 42 either.

Although the protective member 62 in this example is provided only to a position lower than the upper end of the space forming member 71, it can still prevent the inner peripheral surface 4a of the trough 4 from being worn by the transfer of sand. . When the protective member 62 made of steel plate is worn, the protective member 62 can be replaced, and the replacement cost of the protective member 62 is cheaper than the replacement of the trough 4, and the protective member 62 made of steel plate is provided. The maintenance cost will be low even if it is

The protective material 62 may be a stainless steel plate or the like instead of the high-strength steel plate. Moreover, the protective material 62 may be provided only on the portion below the space forming member 71 or may be provided only on the portion of the space forming member 71 facing the opening 71a.

FIG. 8(c-1) is also a cross-sectional view of the bottom of the trough 4 taken along the longitudinal direction, and FIG. 8(c-2) is a trough whose bottom is shown in FIG. 4 is a cross-sectional view taken in a direction crossing the longitudinal direction.

In the examples shown in FIGS. 8(c-1) and 8(c-2) as well, the liner 42 has not been removed, nor has a new arc-shaped groove forming member been installed or concrete has been placed. The protective material 63 in this example is a lining material such as a woven fabric or non-woven fabric impregnated with a hardening resin, or a plate material made of resin adhered thereto.

As shown in FIG. 8(c-2), a protective material 63 is provided over the liner trough 422 in the portion where the liner 42 is left, and the liner trough 422 is covered with the protective material 63. As shown in FIG. The portion of the protective material 63 covering the periphery of the edge of the liner trough 422 is gently slanted and does not have a sharp step, so sand can be suppressed from remaining.

On the other hand, in the portion where the liner 42 is not provided, the protective material 62 is provided on the inner peripheral surface 4a of the trough 4, as shown in FIG. 8(c-1). Further, as shown in FIG. 8(c-1), the portion of the protective material 63 that covers the edge of the liner 42 also slopes gently, and there is no sharp step, thereby suppressing residual sand. can be done.

Although the protective member 63 in this example is provided only up to the same height as the upper end of the space forming member 71, it can suppress wear of the inner peripheral surface 4a of the trough 4 due to transfer of sand. When the protective material 63, which is the lining material, is worn out, the protective material 63 can be lined again. Even if 62 is provided, the maintenance cost will be kept low.

FIG. 9 is a flow chart showing the flow of repair.

FIG. 2 shows an example of the flow of refurbishing the settling basin 1 equipped with the screw conveyor type transfer mechanism 5 shown in FIGS. , FIG. 5, FIG. 9, and the like. In the repair work, the screw conveyor type transfer mechanism 5 shown in FIG. The settling basin 1 is emptied by sucking up the water from the water with a pump (not shown) (pre-repair work). Then, the second coupling 55 is loosened, the bearing 511 and the support shaft 512 are removed, and the screw conveyor 51 arranged in the groove 41 is pulled out from the second coupling 55 and removed (step S1). Next, the first coupling 54 is loosened, the motor 521 and the speed reducer 522 arranged on the beam 9 on the upstream side are removed, and the drive shaft 523 is pulled out from the first coupling 54 (step S2). Then, the driving force transmission device 53 is lifted above the ground and removed together with the first coupling 54 and the second coupling 55 (step S3). After that, the liner trough 422 installed in the central portion in the longitudinal direction of the groove 41 is removed together with the liner base 421 (step S4). Thus, the removal work of the screw conveyor type transfer mechanism 5 is completed. After the removal work, the section where the liner trough 422 and the liner base 421 were installed expands the cross-sectional area of the groove 41 by the thickness of the liner trough 422 and the liner base 421 . The cross-sectional areas of the grooves 41 other than those where the liner trough 422 and the liner base 421 were installed, such as the upstream end and the downstream end, are the same as before the repair. That is, the groove 41 after the screw conveyor 51 has been removed is maintained to have a cross-sectional area equal to or greater than that before the removal. The space forming member 71, the nozzle 73, and the like are installed while maintaining these cross-sectional areas.

Next, the installation work of the ejector transfer mechanism 7 shown in FIG. 5 is performed. In this installation work, first, concrete is placed in a portion of the transmission device installation space V1 (see FIG. 2) other than the pipe installation space V3 to form the upstream inclined surface 81 and the left and right inclined surfaces 82 (step S5). After that, a nozzle pipe 74 is installed from the ground to the pipe installation space V3 along one of the side wall of the settling basin 10 and the left and right inclined surfaces 82, and a nozzle 73 having a discharge port 73a at the end of the pipe on the pipe installation space V3 side. is attached (step S6). Finally, the space forming member 71 is placed in the groove 41 from which the screw conveyor 51 has been removed, and the support member 72 is fixed to the bottom surface 3 of the pond. Then, the space forming member 71 is fixed to the support member 72 while adjusting the height position of the space forming member 71 by the support screw shaft 722 as necessary (step S7). These steps S6 and S7 correspond to an example of the transfer mechanism installation process. Through steps S6 and S7, the ejection port 73a is arranged in the internal space IS.

In this renovation, not only is the pond bottom 3 used as it is, but also an ejector type It has been refurbished into a settling basin 10 equipped with a transfer mechanism 7 . That is, the trough 4 is used as it is for the ejector-type transfer mechanism 7 except that the liner 42 shown in FIG. 2 is removed from the groove 41 . Therefore, modification to the settling basin 10 having the ejector type transfer mechanism 7 can be carried out at low cost. Note that the liner 42 may be left without being removed. However, if the liner 42 remains, a step is formed in the longitudinal direction of the groove 41, so the sand is blocked by the step and cannot be sucked into the internal space IS, and the sand remains at the step. There is a risk that it will be lost. Therefore, it is desirable to remove the liner 42 .

Alternatively, the driving force transmission device 53 may be left in the transmission device installation space V1 without being removed. However, the sand accumulated on the upstream side of the driving force transmission device 53 is blocked by the driving force transmission device 53 and is difficult to be transferred, and may stay there for a long time. Therefore, the driving force transmission device 53 is removed. is preferred. Also, the driving device 52 may be left without being removed. In addition, when leaving it, it is necessary to change the shape of the above-ground portion of the nozzle pipe 74 from that shown in FIG. In addition, the bearing 511 and the support shaft 512 may also be left unremoved. Especially, the bearing 511 exists at a position that blocks a part of the downstream end of the space forming member 71 in the transfer direction, and is located inside the internal space IS. It is desirable to remove it because there is a risk that it will block the flow of sewage flowing through.

9 does not include the step of protecting the inner circumferential surface of the groove. A step of providing materials 61-63 may be performed. That is, a groove inner peripheral surface protecting step may be performed in which at least a portion of the inner peripheral surface 4a of the trough 4 from which the screw conveyor 51 has been removed is covered with protective materials 61 to 63. FIG. This groove inner peripheral surface protection step may be performed after step S2 and before step S7, and the timing of the step is not limited. For example, it may be performed before step S6 is performed. Further, the step of protecting the inner circumferential surface of the groove may be performed without performing step S4 of removing the liner 42 . Even if the groove inner peripheral surface protection process is carried out, there is no need to install new arc-shaped groove forming members or pour concrete. Modification to a solid-liquid separation facility equipped with a mechanism can be implemented at a low cost. Furthermore, the inner peripheral surface 4a of the trough 4 covered with protective materials 61 to 63 shown in FIG. 8 is protected from wear due to movement of sand.

The present invention is not limited to the above-described embodiments, and can be modified in various ways within the scope of the claims. For example, although the trough 4 is made of a concrete flume, it may be formed by pouring concrete without using a concrete flume. In this case, the surface portion of the concrete corresponds to the groove forming member. Further, the driving force transmission device 53 may have only the function of changing the driving direction. Moreover, although the example in which the discharge port 73a is disposed within the internal space IS has been shown, the discharge port 73a may be located outside the internal space IS as long as it is positioned to discharge sewage into the internal space IS. Alternatively, the discharge port 73a may be arranged at a position coinciding with the surface formed by one end of the space forming member 71 in the extending direction, that is, at the boundary surface of the end in the extending direction of the internal space IS. In the present embodiment, after removing the screw conveyor 51, the driving force transmission device 53 is removed, the driving device 52 is removed, and then the liner 42 is removed. Some or all of screw conveyor 51, drive force transmission device 53, drive device 52 and liner 42 may be removed at the same time. Furthermore, the driving force transmission device 53, the driving device 52, and the liner 42 may be removed after the space forming member 71 is installed. In addition, the driving device 52 and the liner 42 may be removed after the nozzle piping 74 and the nozzle 73 are installed or the inclined surface 8 is formed. Further, in the present embodiment, the nozzle pipe 74 and the nozzle 73 are installed after the inclined surface 8 is created, and then the space forming member 71 is arranged, but the order of these may be changed. However, if the nozzle pipe 74 and the nozzle 73 are installed first when forming the inclined surface 8, they may interfere with the formation of the inclined surface 8. Therefore, after forming the inclined surface 8, It is desirable to install a nozzle pipe 74 and a nozzle 73 . Alternatively, the space forming member 71, the nozzle pipe 74, and the nozzle 73 may be combined and integrated before installation and then installed. In addition, although the space forming member 71 of the present embodiment has an arc-shaped cross section, it may have a U-shaped cross section with an open bottom, for example. In addition, the trough 4 of the present embodiment has a U-shaped cross section, but for example, it has a V-shaped cross section, a U-shaped cross section with an open top, or a cross-sectional shape consisting only of an arc (for example, 1 1/2 circular arc shape, circular arc shape less than 1/2 circular arc, or circular arc shape exceeding 1/2 circular arc).

Although the settling basin installed in the sewage treatment plant has been described above as an example, the present invention can also be applied to a sedimentation basin installed in the sewage treatment plant. In addition, solid-liquid separation equipment that separates liquid and solid by sedimenting solids (for example, metal powder, etc.) contained in received liquid to the bottom is used in addition to sewage treatment plants, and the present invention , can be widely applied to general solid-liquid separation equipment.
The solid-liquid separation equipment described so far is
A solid-liquid separation facility in which the solids contained in the received liquid settle to the bottom,
a groove forming member provided on the bottom portion and having an arc-shaped inner peripheral surface;
a hollow space forming member extending along the longitudinal direction of the groove forming member and provided with an opening at the bottom;
a discharge port for discharging a fluid into an internal space defined by the inner peripheral surface of the space forming member;
The opening is arranged to face the arc-shaped inner peripheral surface of the groove forming member,
The space forming member is arranged such that the shortest distance between the outer peripheral surface of the space forming member and the inner peripheral surface of the groove forming member becomes shorter from the upper end of the space forming member toward the opening along the outer peripheral surface. Further, it may be arranged in a groove formed by the groove forming member.
The solid-liquid separation equipment includes at least solid-liquid separation equipment refurbished by the first or second solid-liquid separation equipment refurbishment method of the present invention.
According to this solid-liquid separation equipment, since the flow of the solid toward the opening side becomes faster at the lower end portion of the groove, the solid can be easily sucked through the opening, and the solid can be suppressed from remaining in the groove. . Therefore, the solid-liquid separation equipment of the present invention is a solid-liquid separation equipment that has unprecedented new effects.
The groove forming member may have an arcuate cross-sectional shape or a substantially U-shaped cross-sectional shape. However, when the groove forming member has a substantially U-shaped cross section, a large amount of solid can be deposited in the groove compared to the case where the groove has an arcuate cross section.
Further, in this solid-liquid separation equipment, the groove forming member has a linear upper portion of the inner peripheral surface and an arcuate lower portion of the inner peripheral surface,
The space forming member has an arc-shaped cross section,
A center of a circle including the arc as part of the circumference may be positioned below a boundary between the upper portion and the lower portion of the groove forming member.
By doing so, the shortest distance between the space forming member and the groove forming member can be shortened from the upper end of the space forming member toward the opening along the outer peripheral surface of the space forming member.

Reference Signs List 1, 10 Grit basin 4 Trough 61, 62, 63 Protective material 8 Inclined surface 41 Groove 42 Liner 51 Screw conveyor 53 Driving force transmission device 71 Space forming member 71a Opening 73a Discharge port IS Internal space

Claims (7)

A method for repairing a solid-liquid separation facility having a groove-forming member at the bottom that forms a groove that opens upward,
a screw conveyor removing step of removing the screw conveyor arranged in the groove;
A discharge port for discharging fluid into an internal space defined by a hollow elongated space forming member having an opening at the bottom thereof and an inner peripheral surface of the space forming member in the groove from which the screw conveyor has been removed. and a transfer mechanism installation step for installing the
In the transfer mechanism installation step, the space forming member and the discharge port are maintained while maintaining the cross-sectional area of the groove from which the screw conveyor is removed to be equal to or greater than the cross-sectional area of the groove before the screw conveyor is removed. A method for repairing a solid-liquid separation facility, characterized by being a step of installing. A method for repairing a solid-liquid separation facility having a groove-forming member at the bottom that forms a groove that opens upward,
a screw conveyor removing step of removing the screw conveyor arranged in the groove;
A groove inner peripheral surface protecting step of covering at least a part of the inner peripheral surface of the groove from which the screw conveyor has been removed with a protective material;
A discharge port for discharging fluid into an internal space defined by a hollow elongated space forming member having an opening at the bottom thereof and an inner peripheral surface of the space forming member in the groove from which the screw conveyor has been removed. A method for repairing a solid-liquid separation facility, comprising a transfer mechanism installation step for installing a. 2. A transmission device removing step for removing a driving force transmission device for transmitting a driving force to said screw conveyor, which is disposed in a transmission device installation space connected to one longitudinal end of said groove. Or the repair method of the solid-liquid separation equipment described in 2. 4. The method for repairing solid-liquid separation equipment according to claim 3, further comprising forming an inclined surface in said transmission device installation space, which slopes downward toward said groove. In the transfer mechanism installation step, the shortest distance between the outer peripheral surface of the space forming member and the inner peripheral surface of the groove forming member becomes shorter as it approaches the opening along the outer peripheral surface from the upper end of the space forming member. 5. The method for repairing solid-liquid separation equipment according to any one of claims 1 to 4, wherein said step of installing said space forming member at a position. A liner removal step is provided for removing a detachable liner which is disposed on the inner peripheral surface of the groove forming member in the central portion in the longitudinal direction of the groove and which is worn by contact with the screw conveyor. The method for repairing solid-liquid separation equipment according to any one of claims 1 to 5. A solid-liquid separation facility in which the solids contained in the received liquid settle to the bottom,
a groove forming member provided on the bottom portion and having an arc-shaped inner peripheral surface;
a hollow space forming member extending along the longitudinal direction of the groove forming member and provided with an opening at the bottom;
a discharge port for discharging a fluid into an internal space defined by the inner peripheral surface of the space forming member;
The opening is arranged to face the arc-shaped inner peripheral surface of the groove forming member,
The space forming member is arranged such that the shortest distance between the outer peripheral surface of the space forming member and the inner peripheral surface of the groove forming member becomes shorter from the upper end of the space forming member toward the opening along the outer peripheral surface. and located in the groove formed by the groove forming member ,
a piping installation space connected to one end in the longitudinal direction of the groove formed by the groove forming member and having a piping for supplying fluid to the discharge port;
A solid-liquid separation facility characterized by comprising an inclined surface on the opposite side of the groove with respect to the pipe installation space, which slopes downward as the pipe installation space is approached.

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