JP3211893U - Vacuum cleaner for construction site - Google Patents

Abstract

The present invention provides a vacuum cleaner for a construction site that makes it easy to collect mud and clean inside a tank and prevent mud from entering a submersible pump for drainage and a suction device. A moving carriage, a suction port 21a for sucking mud water, a main tank 4 for separating the sucked mud water into mud and water, a drain port 30a for draining the separated water, and the sucked air are discharged. A pump tank 6 which has an air discharge port 32a and receives water separated in the main tank 4 and air in the main tank 4, and a negative pressure in the main tank 4 and the pump tank 6 to make muddy water in the main tank 4. A vacuum cleaner for a construction site provided with a suction device for sucking into the main tank 4, wherein the main tank 4 is housed in the main tank 4 and has a plurality of holes open at the top; The basket 2 is detachably mounted, and is provided with a dewatering mesh bag having an open upper portion for receiving muddy water sucked from the suction port 21a and separating it into muddy soil and water. [Selection] Figure 4

Description

  The present invention, for example, is a construction site cleaning system that sucks and treats mud such as accumulated water and residual water mixed with earth and sand at construction sites and construction sites, latency cut water after placing concrete, and residual water in water tanks. It is about the improvement of the machine.

  In general, vacuum cleaners used in shield construction or the like are known as vacuum cleaners for sucking and treating mud water such as accumulated water and residual water mixed with earth and sand at civil engineering sites.

  Although not shown in the figure, the vacuumer is a combination of a vacuum pump unit and a drainage pump unit, and there are many large-scale and large-scale products. In addition to troublesome arrangements, there was a problem that the usage was complicated.

  Further, as a small vacuum cleaner, there is a 100V specification wet and dry vacuum cleaner, but this vacuum cleaner has a problem that it is inferior in the ability to suck muddy water.

  Therefore, in order to solve the problems described above, a construction water absorber (hereinafter referred to as a vacuum cleaner) that is relatively small and easy to use and also has a muddy water suction processing capability has been developed and put into practical use (for example, Patent Document 1 and Non-Patent Document 1).

  That is, although not shown, the vacuum cleaner is provided with a carriage, a tank provided in the carriage, a cyclone provided at the upper part of the tank, a mesh-like basket removably accommodated in the tank, and a tank. And a drainage pump, a vacuum blower (vacuum pump), etc., which is provided in the carriage and makes the tank negative pressure.

  Thus, according to the vacuum cleaner, when the pressure in the tank becomes negative due to the operation of the vacuum blower, the muddy water sucked from the suction port of the cyclone falls downward while being separated into the air component and the mud component by the cyclone. . At this time, in the negative pressure tank, the mud having a large mass falls into the lower cage, and the air component having a small mass is sucked into the vacuum pump through the suction pipe and discharged to the atmosphere.

  Of the mud that has fallen into the basket, coarse mud remains in the basket, and moisture and fine mud pass through the basket mesh and accumulate at the bottom of the tank, and are sucked up by the drain pump and drained out of the tank. When mud accumulates in the basket to some extent, the upper lid of the tank is opened, and the basket is taken out from the tank and disposed of.

  The vacuum cleaner separates the sucked mud into air, water, and mud, and the air and water are discharged out of the tank. The mud is stored in a basket and then taken out and disposed of with the basket. Therefore, there is an advantage that the muddy water treatment in the tank can be performed relatively easily and conveniently.

However, the above vacuum cleaner still has problems as shown in the following (1) to (5).
(1) That is, since the vacuum cleaner directly receives muddy water with a mesh-shaped basket, a part of the fine mud may pass through the basket mesh and the fine mud may accumulate in the tank. There is a problem that it takes time to collect the water and clean the inside of the tank.
(2) In addition, the vacuum cleaner says that part of the mud passes through the basket mesh to block the drainage pump, or mud with a small mass separated by the cyclone enters the vacuum blower. There was a problem.
(3) Furthermore, the vacuum cleaner is equipped with a plurality of tanks in front of the vacuum blower as a countermeasure against intrusion of mud into the vacuum blower, and the water level in the tank is detected by a float type. In order to prevent erroneous detection of float floating due to evacuation, it was necessary to provide a separate room for the float, and there was a problem that the apparatus itself was enlarged.
(4) In addition, the vacuum cleaner uses a 5.5 kW motor as the vacuum blower motor, but it is used with the rotational speed reduced to about 1750 rpm as a countermeasure against heat generation of the vacuum blower and overload of the motor. The motor capacity is only used up to about 3.5 kW. As a result, there was a problem that the capacity was insufficient when sucking muddy water, and the motor burned out even if measures against heat generation and overload were taken.
(5) Furthermore, the silencer is disposed in the blower chamber and the motor is disposed above the vacuum blower having a high heat generation temperature, so that the heat dissipation efficiency of the silencer deteriorates. At the same time, there was a problem that the motor received heat from the vacuum blower.

Japanese Utility Model Publication No. 6-69389

List of products on the San-A Industries Co., Ltd. website (Fuma 8K for cleaning and collection (vacuum shooter tank: mud collection)), [Search May 18, 2017], Internet <URL: http: //www.sanee. co.jp/ ＞

  The present invention has been made in view of such problems, and its purpose is to facilitate the collection of mud and the cleaning of the tank, as well as to prevent the mud from entering the drainage submersible pump and suction device. An object of the present invention is to provide a vacuum cleaner for a construction site that can be prevented and that the device itself can be miniaturized and that has an excellent suction capability.

  In order to achieve the above object, a vacuum cleaner for a construction site according to the present invention is provided on a portable movable carriage and a movable carriage, has a suction port for sucking muddy water, and converts the sucked muddy water into mud and water. A main tank to be separated, a pump provided on the movable carriage, having a drain outlet for draining the separated water and an air outlet for discharging the sucked air, and accepting the water separated in the main tank and the air in the main tank A vacuum cleaner for a construction site provided with a tank, a suction device for sucking muddy water into the main tank with negative pressure in the main tank and the pump tank, and a control panel provided in the mobile carriage. The main tank is housed in the main tank and has a basket having a large number of holes opened upward, and is detachably mounted in the basket and sucked from the suction port. A dewatering mesh bag having an open top for receiving water and separating it into mud and water is provided, and the pump tank is housed in the pump tank and drains water accumulated in the pump tank from a drain outlet. The water level detection system is characterized by a sensor-type submersible pump for drainage.

  The drainage submersible pump is preferably a capacitive submersible pump provided with three sensor detectors having different heights for detecting three points of a stop water level, an operating water level, and an abnormally high water level.

  The basket is a punching basket or a mesh basket with an open top, and the dewatering mesh bag is provided with a tightening string or a tightening band at an opening, and the dewatering mesh bag is widened. In the state, it is preferable to be fastened and fixed to the opening of the basket by a fastening string or a fastening band.

  Each of the main tank and the pump tank is formed of a stainless steel plate and is detachably attached to the moving carriage, and a tank body that is open at the top, an opening / closing lid that covers the opening of the tank body so as to be openable and closable, It is preferable to provide a cleaning inspection window that can be opened and closed provided at the lower end of the tank body.

  Between the main tank and the pump tank, a water passage for guiding water separated in the main tank into the pump tank, and air sucked together with muddy water in the main tank is guided from the main tank into the pump tank. Preferably, an air passage is provided, and a baffle plate that reverses the air in the main tank flowing in from the air passage in the vertical direction and guides it to the air discharge port is provided in the pump tank.

  The suction device is connected to an air discharge port of a pump tank via a suction hose, and a vacuum blower that sucks muddy water into the main tank with negative pressure in the main tank and the pump tank, and a motor that drives the vacuum blower It is preferable that a vacuum blower and a motor are assembled in a vertical direction on a movable carriage, and a vacuum blower having a high heat generation temperature is arranged on the upper side of the motor.

  Preferably, a Y-type strainer is interposed between the suction hose and the air discharge port of the pump tank.

  The vacuum blower preferably includes a safety valve that automatically takes in a large amount of air when the usable range of the vacuum blower is exceeded.

  A silencer is connected to the discharge port of the vacuum blower, and the silencer is disposed in a vertically oriented posture on the moving carriage, and the outer peripheral surface of the silencer is covered with a heat insulating material. Is preferred.

  It is preferable that a suction nozzle is connected to the suction port of the main tank via a flexible suction hose, and a flexible drain hose is connected to the drain port of the pump tank.

  The suction nozzle includes a suction pipe connected to a distal end portion of a suction hose, and a scraper nozzle provided at the distal end portion of the suction pipe and having a slit-like suction port widened at the distal end. It is preferable that a suction adjustment hole is formed at the base end portion of the pipe, and the suction adjustment hole can be opened and closed by a cylindrical slide member slidably fitted to the base end portion of the suction pipe.

    The movable carriage is provided with a horizontal frame, a rectangular parallelepiped housing frame standing on the horizontal frame and housing the suction device, and covering at least the upper surface and the left and right side surfaces of the housing frame to form a room for housing the suction device. A removable or openable / closable cover body, an operating lever provided on the receiving frame, a plurality of suspension fittings provided on the upper end of the receiving frame, and at least six casters provided on the lower surface of the horizontal frame. It is preferable.

  The control panel includes at least a forced drain switch for driving a submersible pump for drainage for a certain period of time, an operation push button for operating a submersible pump for drainage and a suction device, and a stop push button for stopping the submersible pump for drainage and a suction device. And an abnormal indicator lamp that informs lighting and flashing of an overload of the submersible pump for drainage and the suction device and an abnormally high water level in the pump tank.

  The vacuum cleaner for a construction site according to the present invention has a main tank that separates sucked mud into mud and water, and accepts sucked mud that is attached to the basket in a detachable manner. Since it is equipped with a muddy water and a mesh bag for dewatering that separates into water, the mud is dehydrated without passing through the mesh basket and collecting in the tank like a conventional vacuum cleaner. As a result, the muddy soil can be easily recovered and the main tank can be easily cleaned.

  Since the vacuum cleaner for construction sites according to the present invention collects mud in the muddy water with a dewatering mesh bag attached to and detached from the bucket, the muddy earth is prevented from entering the submersible pump for drainage and the suction device. In addition, the submersible pump for drainage and the suction device can be eliminated, and the dewatered mesh bag containing the mud can be thrown away as industrial waste or reused.

  The vacuum cleaner for a construction site according to the present invention has two tanks, a main tank and a pump tank, and a water level detection system is provided with a sensor-type submersible pump for drainage in the pump tank. There is no need to provide a large number of tanks as in the case of vacuum cleaners, or to provide a separate room for floats, as in the case of float type water level detection, and the size of the device itself can be reduced compared to conventional vacuum cleaners. it can.

  The vacuum cleaner for a construction site according to the present invention is a sensor type equipped with three sensor detectors having different heights for detecting three points of a stop water level, an operating water level, and an abnormally high water level in a drainage submersible pump. Since the electrostatic capacity type submersible pump is used, erroneous detection is extremely difficult to occur, and malfunction of the drainage submersible pump can be prevented. Also, if the detector detects an abnormally high water level, it can be judged that the drainage hose is clogged or the drainage submersible pump is abnormal, and all operations can be stopped to prevent water from entering the suction device. .

  The vacuum cleaner for a construction site according to the present invention is provided with a tightening string or a tightening band at the opening of the dewatering mesh bag, and with the opening of the dewatering mesh bag being widened, the tightening string or the tightening band at the opening of the basket. Therefore, the sucked mud water can be reliably and satisfactorily received in the dewatering mesh bag.

  In the vacuum cleaner for construction sites according to the present invention, the main tank and the pump tank are formed of stainless steel plates, so that it is not necessary to apply paint after cleansing (operation for removing dirt, rust, and old paint film). Further, since the main tank and the pump tank are detachably attached to the movable carriage, it is possible to clean using shot blasting and to reduce the maintenance process. Further, since a cleaning inspection window that can be opened and closed is provided in the main tank and the pump tank, the main tank and the pump tank can be easily and easily cleaned.

  The vacuum cleaner for a construction site according to the present invention is provided with an air passage between the main tank and the pump tank that guides air sucked together with muddy water from the main tank to the pump tank. In the tank, a baffle plate that reverses the air in the main tank flowing in from the air passage in the vertical direction and then guides it to the air discharge port of the pump tank is disposed. Muddy water sucked into the main tank can be prevented from splashing to some extent by the mesh bag for dehydration, preventing inflow of moisture and dust intrusion into the suction device. Can do.

  The vacuum cleaner for a construction site according to the present invention includes a vacuum blower and a motor, and the vacuum blower and the motor are assembled in a vertical direction on a movable carriage, and the vacuum blower having a high heat generation temperature is disposed on the upper side of the motor. Therefore, the motor does not receive heat from the vacuum blower, and the temperature rise of the motor can be suppressed.

  The vacuum cleaner for a construction site according to the present invention connects an air discharge port of a pump tank and a vacuum blower of a suction device with a suction hose, and a Y-type strainer is interposed between the suction hose and the air discharge port of the pump tank. Therefore, it is possible to further prevent dust from entering the vacuum blower.

  The vacuum cleaner for a construction site according to the present invention includes a safety valve that automatically takes in a large amount of air when the vacuum blower exceeds the usable range (high negative pressure range) of the vacuum blower. When the degree reaches a certain value, the safety valve automatically opens and a large amount of air can be taken in to prevent overload of the motor and heat generation of the vacuum blower. Further, since the vacuum blower is provided with a safety valve, the motor output can be used with MAX without reducing the rotation speed of the vacuum blower, and the suction force can be maintained at a certain level or higher even when the muddy water is sucked.

  The vacuum cleaner for a construction site according to the present invention has a silencer connected to the discharge port of the vacuum blower, and the silencer is disposed on the moving carriage in the atmosphere and in a vertical posture. , Better heat dissipation efficiency. Moreover, since the outer peripheral surface of the silencer is covered with a heat insulating material, burns due to heat generated by the silencer can be prevented.

  The vacuum cleaner for a construction site according to the present invention has a suction nozzle connected to the suction port of the main tank via a flexible suction hose, and a flexible drainage hose connected to the drainage port of the pump tank Therefore, drainage of the accumulated water in narrow places, suction of residual water in the water storage tank, drainage of residual water in places where pumps do not fit, etc. are excellent in workability and drain to a predetermined place It can be very convenient.

  The vacuum cleaner for a construction site according to the present invention is configured such that the suction nozzle is provided with a scraper nozzle having a slit-like suction port at the tip of the suction pipe, so that the suction efficiency can be improved and the floor surface or the like can be improved. Even stuck mud can be scraped off and sucked. In addition, a suction adjustment hole is formed at the base end of the suction pipe, and the suction adjustment hole can be opened and closed by a cylindrical slide member that is slidably fitted to the base end of the suction pipe. If the suction member is slid or the suction head is high and the suction adjustment hole is opened and sucked, the suction can be prevented, and when the remaining water is sucked, the slide member is slid to suck. When the adjustment hole is closed, the suction force is increased.

  In the vacuum cleaner for a construction site according to the present invention, since the movable carriage is provided with at least six casters, it is difficult to remove the wheel into a groove or the like during traveling. Further, since the movable carriage includes a removable or openable / closable cover body that covers the suction device, maintenance of the suction device can be performed easily and easily by opening the cover body.

  The vacuum cleaner for a construction site according to the present invention has a forced drain switch for a pump for operating the submersible pump for drainage for a certain period of time, so when the forced drain switch is pressed, the submersible pump for drainage only for a certain period of time. Is activated, draining the water in the pump tank, which is extremely convenient for confirming the operation of the submersible pump for drainage and draining water after work repair. Further, since the control panel is provided with an abnormal indicator lamp that notifies the overload of the submersible pump for drainage and the suction device and the abnormally high water level in the pump tank by lighting and blinking, it becomes easy to limit the abnormal part.

It is the perspective view which looked at the cleaner for construction sites concerning the embodiment of the present invention from the front side. It is the perspective view which similarly looked at the vacuum cleaner for construction sites from the back side. It is a left view of the vacuum cleaner for construction sites in the state where a part of cover body was removed. It is a perspective view of the main tank and pump tank part of the cleaner for construction sites. It is a front view of a main tank and a pump tank part similarly. It is a top view of a main tank and a pump tank part similarly. It is the left view of a main tank and a pump tank part similarly. It is a right view of a main tank and a pump tank part similarly. The dewatering mesh bag is shown, (A) is a front view of the dewatering mesh bag in a flat shape, (B) is a perspective view of the dewatering mesh bag mounted on the basket taken out from the main tank, (C ) Is a perspective view of the dewatered mesh bag with mud. A suction nozzle, a suction hose, and a drainage hose are shown, (A) is a front view of a suction nozzle, (B) is a front view of a suction hose, (C) is a front view of a drainage hose.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 to 3 show a vacuum cleaner for a construction site according to an embodiment of the present invention. The vacuum cleaner for a construction site is, for example, a pool or residual water mixed with earth and sand at a civil engineering site or a construction site. It is intended to suck in and treat muddy water such as late-cut water after installation and residual water in the water tank, and is provided in the portable mobile cart 1 and the mobile cart 1, and the basket 2 and the dewatering mesh bag 3 are The main tank 4 accommodated, the pump tank 6 provided in the movable carriage 1 and containing the submersible pump 5 for drainage, and the suction device provided in the movable carriage 1 to make the inside of the main tank 4 and the pump tank 6 negative pressure 7 and a control panel 8 provided on the movable carriage 1.

  As shown in FIG. 1 to FIG. 3, the portable movable carriage 1 includes a horizontal frame 9 formed in a frame shape by a plurality of metal pillars, and a plurality of metal erected on the horizontal frame 9. A storage frame 10 that is formed in a rectangular parallelepiped shape by a pillar-shaped material and that accommodates the suction device 7, an upper surface cover 11 a that covers the upper surface and the left and right side surfaces of the storage frame 10, and forms a room in which the suction device 7 is accommodated A cover body 11 composed of a side cover 11b, a planar U-shaped operating lever 12 provided in a horizontal posture on the storage frame 10, four suspension fittings 13 provided on the upper end of the storage frame 10, and a horizontal frame 9 And six casters 14 provided in two rows on the lower surface of the cover, and two side covers 11b of the cover body 11 are detachably attached to the receiving frame 10 by a plurality of butterfly bolts 15. It has been.

  In the above embodiment, the two side covers 11b of the cover body 11 are detachable from the housing frame 10 by the butterfly bolt 15, but in other embodiments, the cover is not shown. The two side covers 11b of the body 11 may be swingably attached to the receiving frame 10 by hinges so that the two side covers 11b can be opened and closed.

  In the above embodiment, the upper surface and the left and right side surfaces of the storage frame 10 are covered with the cover body 11, but in other embodiments, the upper surface, the left and right side surfaces, and the front surface of the storage frame are not shown. Further, the back surface may be covered with the cover body 11.

  The main tank 4 separates the sucked mud into mud and water, and flows the separated water to the pump tank 6 side, and also flows the air sucked into the main tank 4 into the pump tank 6, In the main tank 4, a basket 2 having a large number of holes open at the top and a basket 2 that is detachably mounted in the basket 2, accepts the sucked mud and separates it into mud and water, and dewatered at the top. Each mesh bag 3 is accommodated.

  Specifically, as shown in FIGS. 1, 2, 4 to 6, and 8, the main tank 4 is formed of a stainless steel plate and is detachably attached to the movable carriage 1, and moves to the lower end. A tank main body 18 having an open upper portion provided with a mounting bracket 17 fixed to the horizontal frame 9 of the carriage 1 by a bolt 16 and an opening of the tank main body 18 are swingably attached via a hinge 19. An opening / closing lid 20 that covers the opening of 18, an L-shaped suction tube 21 that is inserted in the opening / closing lid 20 and forms a suction port 21 a, and a lever cup provided at the tip of the suction tube 21 A male adapter 22 of a ring (a lever-type joint comprising a male adapter and a female coupler) and an opening of a patchon lock or the like that is provided between the tank body 18 and the opening / closing lid 20 and holds the opening / closing lid 20 in a closed state. And means 23, and a closable cleaning inspection window 24 of the cam type structure provided at the lower portion of the tank body 18.

  The basket 2 is made of a stainless steel punching basket with a handle 2a that is open at the top, with the opening facing upward in the main tank 4 and the base end of the suction pipe 21 positioned in the opening. Is held and held by.

Further, as shown in FIG. 9, the dewatering mesh bag 3 has two tightening cords 3a attached to the opening formed with opposing slits, and the opening of the basket 2 in a state where the opening is widened. Are fastened and fixed by two fastening strings 3a.
That is, the dewatering mesh bag 3 is inserted into the basket 2 with the opening facing upward, and then the opening of the dewatering mesh bag 3 is expanded outward by 180 degrees along the opening of the basket 2. The two fastening strings 3 a are folded and fastened to the opening portion side of the basket 2, thereby being fastened and fixed to the opening portion of the basket 2. The mesh of the dewatering mesh bag 3 is set so that only water flows out when mud is received in the dewatering mesh bag 3.

  In this embodiment, the size of the dewatering mesh bag 3 (size when flattened) is formed in a rectangular shape having a width of 48 cm and a height of 62 cm. The mesh size of the mesh is 0.5 mm.

  In the above-described embodiment, the punching basket 2 whose upper side is opened in the basket 2 is used. However, in other embodiments, a basket-like mesh basket whose upper side is opened in the basket 2 may be used. good.

  In the above embodiment, the two fastening strings 3a are attached to the opening of the dewatering mesh bag 3. However, in other embodiments, the opening of the dewatering mesh bag 3 is not shown. Alternatively, only one tightening cord 3a may be attached, or a tightening band (not shown) is attached to the opening of the dewatering mesh bag 3 instead of the tightening cord 3a, and the opening of the dewatering mesh bag 3 is attached. You may make it clamp | tighten and fix to the opening part of the basket 2 with a clamping band.

  The pump tank 6 receives water separated in the main tank 4 and air sucked into the main tank 4, drains the received water, and discharges the received air to the suction device 7 side. The pump tank 6 accommodates a submersible pump 5 for drainage that uses a sensor type water level detection method for draining water accumulated in the pump tank 6 from the drain port 30a.

  Specifically, as shown in FIGS. 1 and 4 to 7, the pump tank 6 is formed of a stainless steel plate and is detachably attached to the movable carriage 1, and the horizontal frame 9 of the movable carriage 1 is attached to the lower end portion. A tank main body 27 with an open upper portion provided with a mounting bracket 26 fixed to a bolt 25 and an opening of the tank main body 27 is swingably attached to the opening of the tank main body 27 via a hinge 28, and the opening of the tank main body 27 is opened and closed. An openable / closable cover 29 that covers freely, a drainage pipe 30 that is provided in a penetrating manner at the top of the tank body 27, and a lever coupling (from a male adapter and a female coupler) provided at the tip of the drainage pipe 30. The male adapter 31 of the lever-type joint), the open / close lid 29 and the exhaust pipe 32 that forms the air exhaust port 32a, and the outlet of the exhaust pipe 32. A Y-type strainer 33 with a built-in screen for removing foreign substances and dust, an opening / closing means 34 such as a patch lock provided between the tank body 27 and the opening / closing lid 29, and holding the opening / closing lid 29 closed; A cleaning inspection window 35 having a cam-type structure that can be opened and closed is provided at the lower end of the tank body 27.

Further, as shown in FIG. 5, the drainage submersible pump 5 is provided with three sensor detectors 5a, 5, and 5c having different heights for detecting three points of a stop water level, an operating water level, and an abnormally high water level. It consists of a capacitive submersible pump, is installed in a standing posture on the bottom wall of the pump tank 6, and the discharge port of the capacitive submersible pump is connected to a drain pipe 30. This electrostatic capacity type submersible pump performs drain ON / OFF control by the lowest and middle sensor detection units 5a and 5b.
That is, in the electrostatic capacity type submersible pump, water accumulates in the pump tank 6, and when the middle sensor detection unit 5 b detects the water level, the operation starts and drains. When the water level drops and the lowest sensor detection unit 5a detects the water level, the drive is controlled to stop the operation. Furthermore, when the water level in the pump tank 6 rises to the uppermost sensor detection unit 5c, the electrostatic capacity type submersible pump determines that the drainage hose 58 is clogged or the drainage submersible pump 5 is abnormal, The drive is controlled to stop and prevent water from entering the suction device 7.

  In this embodiment, the drainage submersible pump 5 is a drainage submersible sewage pump (3-point type, model: DOX-212KAW) manufactured by Sakuragawa Pump Manufacturing Co., Ltd.

Between the main tank 4 and the pump tank 6, as shown in FIG. 4, a water passage 36 for guiding water separated in the main tank 4 into the pump tank 6, and muddy water in the main tank 4. Air passages 37 for guiding the air sucked together from the main tank 4 into the pump tank 6 are provided.
That is, as shown in FIG. 5, the water passage 36 is formed with openings at the lower ends of the main tank 4 and the pump tank 6, and flanges 38 provided at the outer peripheral edges of the openings are fastened together with a packing 39. It is formed by connecting in an airtight manner with a tool 40 (consisting of a bolt and a nut). Further, as shown in FIG. 5, the air passage 37 is formed with openings at the upper ends of the main tank 4 and the pump tank 6, and the flanges 41 provided at the outer peripheral edge of each opening are tightened via the packing 42. It is formed by connecting airtightly with a tool 43 (consisting of a bolt and a nut).

  Further, as shown in FIGS. 4 to 6, a baffle plate 44 that reverses the air in the main tank 4 flowing in from the air passage 37 in the vertical direction and guides it to the air discharge port 32 a is disposed in the pump tank 6. Has been. The baffle plate 44 is formed in a box shape with an upper surface and one side surface opened, and the upper end of the baffle plate 44 is positioned above the lower end of the exhaust pipe 32 provided in a penetrating manner in the opening / closing lid 29. And it is attached to the inner peripheral surface of the pump tank 6 so as to surround the opening of the air passage 37 in the pump tank 6. Therefore, the air flowing into the pump tank 6 from the air passage 37 once flows upward by the baffle plate 44, then reverses in the vicinity of the opening / closing lid 29 and then flows into the exhaust pipe 32. As a result, it becomes difficult for the splash in the main tank 4 to flow to the air discharge port 32a side of the pump tank 6, so that the inflow of moisture and dust into the suction device 7 can be prevented.

  As shown in FIG. 3, the suction device 7 is connected via a suction hose 45 to a Y-type strainer 33 provided at the outlet of an exhaust pipe 32 that forms an air discharge port 32a of the pump tank 6, and the inside of the main tank 4 and A vacuum blower 46 that sucks muddy water into the main tank 4 from the suction port 21 a with a negative pressure inside the pump tank 6, a motor 47 that drives the vacuum blower 46, and a belt transmission mechanism that interlocks and connects the vacuum blower 46 and the motor 47. 48 (consisting of a driving pulley 48a, a driven pulley 48b, and a belt 48c), and a vacuum blower 46 and a motor 47 are assembled in a vertical direction in a space surrounded by the cover body 11 and on the movable carriage 1. In addition, a vacuum blower 46 having a high heat generation temperature is disposed above the motor 47. Thereby, the motor 47 does not receive heat radiation from the vacuum blower 46, and the temperature rise of the motor 47 can be suppressed.

  Further, the vacuum blower 46 is provided with a safety valve (not shown) that automatically takes in a large amount of air when the usable range of the vacuum blower 46 is exceeded, and when the degree of vacuum reaches a certain value, the safety valve It opens automatically and takes in a large amount of air to prevent overload of the motor 47 and heat generation of the vacuum blower 46. As a result, the vacuum blower 46 can use the output of the motor 47 with MAX without reducing the rotation speed, and can maintain the suction force at a certain level or higher even when the muddy water is sucked.

  Furthermore, a silencer 50 is connected to the discharge port of the vacuum blower 46 via a connection hose 49. The silencer 50 is disposed on the mobile carriage 1 in a state of being opened to the atmosphere and in a vertical posture. The outer peripheral surface of the silencer 50 is covered with a heat insulating material (Aeroflex (registered trademark)). Thereby, the heat dissipation efficiency of the silencer 50 is improved, and burns due to heat generated by the silencer 50 can be prevented.

  In the suction device 7, the operation of the vacuum blower 46 is stopped during the operation of the drainage submersible pump 5, and the vacuum blower 46 will be operated when the operation of the drainage submersible pump 5 is stopped. The drive is controlled.

In this embodiment, a Roots type blower having a maximum degree of vacuum of −40 kPa, a maximum suction amount of 4.84 m ³ / min, and a rotation speed of 2400 rpm is used for the vacuum blower 46. As the motor 47, a motor 47 having an output of 5.5 kW is used. Furthermore, when the degree of vacuum reaches −40 kPa, the safety valve of the vacuum blower 46 is automatically opened, and a large amount of air is taken in to prevent overload of the motor 47 and heat generation of the vacuum blower 46.

  The control panel 8 is provided on the movable carriage 1, and in the control panel 8, a forced drain switch for pump (not shown) for operating the submersible pump 5 for drainage for a certain period of time, and a leakage breaker (not shown). ), A circuit protector (not shown), a thermal relay (not shown) of the drainage submersible pump 5, and a thermal relay (not shown) for the motor 47 of the suction device 7. On the surface, a power button 51 for turning on the power, a power indicator lamp 52 for indicating that the power has been turned on, an operation push button 53 for operating the drainage submersible pump 5 and the suction device 7, a drainage submersible pump 5 and A stop push button 54 for stopping the suction device 7, a pump lamp 55 for informing the operation of the submersible pump 5 for drainage, an overload of the drain pump and the suction device 7, and an abnormally high water level in the pump tank 6 A fault indicator lamp 56 to notify the lighting and flashing is provided.

  In this embodiment, when the forced drainage switch for pumps (not shown) is pressed once, the drainage submersible pump 5 is operated for 5 seconds, and the vacuum blower 46 and the like are activated by the overload of the drainage pump and the suction device 7. When heat is generated, the abnormality indicator lamp 56 is turned on, and when the water level in the pump tank 6 becomes an abnormally high water level, the abnormality indicator lamp 56 blinks. Furthermore, when the operation push button 53 is pressed, the suction device 7 is operated after the drainage submersible pump 5 has been operated for 5 seconds.

  The construction site vacuum cleaner described above can be detachably attached to the suction pipe 21 forming the suction port 21a of the main tank 4 and a power cable (not shown) of a predetermined length as accessories. A flexible suction hose 57 of a predetermined length to be connected and a drainage pipe 30 forming a drain port 30a of the pump tank 6 to be detachably connected by a lever coupling. A drain hose 58 and a suction nozzle 59 that is detachably connected to the tip of the suction hose 57 by lever coupling are provided.

  As shown in FIG. 10, the suction nozzle 59 is provided at the base end portion of the metal suction pipe 61 provided with the male adapter 60 of the lever coupling, and at the tip end portion of the suction pipe 61, and has a wider width at the tip end. And a scraper nozzle 62 having a slit-like suction port. A suction adjustment hole 61a is formed in the proximal end portion of the suction pipe 61, and the suction adjustment hole 61a is slidably attached to the proximal end portion of the suction pipe 61. It can be opened and closed by a fitted rubber cylindrical slide member 63.

  In this embodiment, a cabtire cable having a length of 10 m is used as the power cable (not shown), and the suction hose 57 is provided with female couplers 64 of lever couplings at both ends. A flexible hose with a length of 20 m and a nominal diameter of 40 A is used. Further, the drain hose 58 is provided with a female coupler 65 of a lever coupling at one end and a length of 5 m, and a nominal diameter of 25 A is possible. A flexible hose is used.

  Next, the case where the above-described vacuum cleaner for a construction site is used and muddy water is sucked and processed at a civil engineering site or a construction site will be described.

  First, a vacuum cleaner for a construction site is carried to a civil engineering site or a construction site and installed in a horizontal place, and a suction hose 57 and a suction nozzle 59 are sequentially connected to the suction pipe 21 that forms the suction port 21a of the main tank 4. The drain hose 58 is connected to the drain pipe 30 that forms the drain port 30a of the pump tank 6, and the vacuum cleaner for the construction site is connected to the power source by a power cable (not shown).

  At this time, when the tip of the suction nozzle 59 is submerged or when the suction head is high, the slide member 63 of the suction nozzle 59 is moved to keep the suction adjustment hole 61a open.

  Next, the opening / closing lid 20 of the main tank 4 is opened, the basket 2 is taken out, the dewatering mesh bag 3 is mounted in the taken out basket 2 with the opening widened, and the opening of the dewatering mesh bag 3 is tightened. The string 3a is fastened and fixed to the opening of the basket 2.

  When the dewatering mesh bag 3 is mounted in the basket 2, the basket 2 and the dewatering mesh bag 3 are accommodated in the main tank 4, and the opening / closing lid 20 is closed.

  In this state, the power button 51 is pressed to turn on the power, and the operation push button 53 is pressed. Then, after the drainage submersible pump 5 is operated for a certain time (in this example, 5 seconds), the vacuum blower 46 of the suction device 7 is operated, and the air in the main tank 4 is supplied to the vacuum blower 46 side via the suction hose 45. To make negative pressure in the main tank 4 and the pump tank 6.

  When the pressure in the main tank 4 becomes negative, the suction nozzle 59 sucks muddy water from the civil engineering site. The sucked muddy water passes through the suction hose 57 and is collected from the suction pipe 21 into the main tank 4 and put into the dewatering mesh bag 3 in the basket 2. In addition to the muddy water, air is also sucked into the main tank 4 by the suction nozzle 59.

  At this time, since the suction nozzle 59 is provided with the scraper nozzle 62 having a slit-like suction port at the tip of the suction pipe 61, the suction efficiency can be improved, and even if it is mud stuck to the floor surface, etc. It can be scraped off and sucked. Further, a suction adjustment hole 61a is formed in the proximal end portion of the suction pipe 61 of the suction nozzle 59, and the suction adjustment hole 61a can be opened and closed by the slide member 63. Therefore, when the suction nozzle 59 is submerged or the suction head is high. When the slide member 63 is slid and the suction adjustment hole 61a is opened and sucked, the blockage can be prevented. When the remaining water is sucked, the slide member 63 is slid to open the suction adjustment hole 61a. When closed, the suction force can be increased. Furthermore, since the muddy water is put into the mesh bag 3 for dehydration, splashing can be suppressed to some extent.

  The muddy water thrown into the dewatering mesh bag 3 is separated into mud and water by the dewatering mesh bag 3, and only the mud is accumulated in the dewatering mesh bag 3.

  The air sucked together with the muddy water into the main tank 4 flows into the pump tank 6 from an air passage 37 provided between the main tank 4 and the pump tank 6 and once flows upward by the baffle plate 44. Inverted in the vicinity of the opening / closing lid 29, flows into the exhaust pipe 32, reaches the vacuum blower 46 through the suction hose 45, and is discharged from the silencer 50 into the atmosphere. As a result, the splash in the main tank 4 becomes difficult to flow to the air discharge port 32a side of the pump tank 6, so that the inflow of moisture and dust into the vacuum blower 46 can be prevented. Furthermore, since the Y-type strainer 33 is interposed between the air discharge port 32 a of the pump tank 6 and the suction hose 45, it is possible to further prevent dust from entering the vacuum blower 46.

  The water that has passed through the dewatering mesh bag 3 flows down from the plurality of holes of the basket 2 and accumulates at the bottom of the main tank 4, and a water passage 36 provided between the main tank 4 and the pump tank 6. And then flows into the pump tank 6.

  When water accumulates in the pump tank 6 and the sensor detector 5b in the middle of the submersible pump 5 detects the water level, the submersible pump 5 operates to suck up the water in the pump tank 6, and the drain pipe 30 Then, the water is drained to a predetermined place (for example, a sewer) through the drainage hose 58. During the operation of the drainage submersible pump 5, the operation of the vacuum blower 46 of the suction device 7 is stopped.

  When the water level in the pump tank 6 is lowered by the drainage of the drainage submersible pump 5 and the lowest sensor detection unit 5a of the drainage submersible pump 5 detects the water level, the drainage submersible pump 5 stops and the suction device 7 Operation resumes. Thereby, muddy water can be sucked into the main tank 4 from the suction nozzle 59.

  In this way, the vacuum cleaner for the construction site is capable of sucking muddy water, detecting full water by the sensor detection unit 5b, starting the submersible pump 5 for drainage, stopping the vacuum blower 46, detecting water level drop by the sensor detection unit 5a, and draining water. The operation of stopping the middle pump 5 → starting the vacuum blower 46 → sucking muddy water is sequentially repeated.

  When all the muddy water has been sucked, the stop push button 54 is pressed to stop the operation of the construction site cleaner. When the stop push button 54 is pressed, a warm-up operation is performed for several minutes (3 minutes in this example) in order to dehumidify the inside of the vacuum blower 46, and then the operation is stopped. During this time, the pump lamp 55 blinks.

  After completion of the operation, the opening / closing lid 20 and the cleaning inspection window 24 of the main tank 4, the opening / closing lid 29 and the cleaning inspection window 35 of the pump tank 6 are opened, and the dewatering mesh bag 3 containing the mud is put together with the basket 2. The dehydrated mesh bag 3 containing the mud is taken out and discarded as industrial waste, or only the mud is discarded and the dehydrated mesh bag 3 is washed and reused. In addition, the deposits in the main tank 4 and the pump tank 6 are removed and washed, and the three sensor detectors 5a, 5b, and 5c of the submersible water pump 5 are removed.

  In addition, when the suction capability is reduced or the suction is not performed during the operation of the vacuum cleaner for the construction site, or when the abnormality indicator lamp 56 is lit or blinked, the cause is investigated and measures are taken. For example, when the suction capacity decreases, the dewatering mesh bag 3 may be full or clogged, so the operation of the vacuum cleaner for the construction site is stopped and the dewatering mesh bag 3 is replaced, Or clean it. When the abnormality indicator lamp 56 is lit, the submersible water pump 5 and the suction device 7 are overloaded, so the thermal relay (not shown) of the submersible water pump 5 and the motor 47 of the suction device 7 are used. In order to stop the drainage submersible pump 5 and the suction device 7, the power supply side adjustment, the safety valve readjustment, and the drainage submersible pump 5 are cleaned. Further, when the abnormality indicator lamp 56 blinks, the drain hose 58 or the drainage submersible pump 5 is blocked, or the sensor detection parts 5a, 5b, 5c of the drainage submersible pump 5 are dirty, and the pump tank. Since the six rooms are at an abnormally high water level, the drainage hose 58 and the drainage submersible pump 5 are blocked, or the sensor detectors 5a, 5b, and 5c of the drainage submersible pump 5 are cleaned.

  Thus, the construction site vacuum cleaner described above is equipped with the dewatering mesh bag 3 that receives the muddy water and separates it into the muddy water and the water in the basket 2. The portion passes through the mesh-shaped basket and does not accumulate in the tank, and the mud is collected well by the dewatering mesh bag 3, making it easy to collect the mud and in the main tank 4. Cleaning becomes easy. In addition, the dewatering mesh bag 3 can prevent the mud from entering the drainage submersible pump 5 and the suction device 7, and the drainage submersible pump 5 and the suction device 7 can be prevented from malfunctioning. The mesh bag 3 can be discarded as industrial waste as it is, or can be reused.

  In the construction site cleaner, the tank is composed of the main tank 4 and the pump tank 6, and the water level detection method is a sensor type submersible submersible pump 5 disposed in the pump tank 6. There is no need to provide a large number of tanks as in the conventional vacuum cleaner, or to provide a separate room for floats as the water level detection is float type, which reduces the size of the device itself compared to conventional vacuum cleaners. You can plan. For example, when the same suction device 7 is used, the conventional vacuum cleaner has a length of 1800 mm, a width of 1150 mm, and a height of 815 mm, whereas the construction site cleaner has a length of It is 1400 mm, width is 1100 mm, and height is 740 mm, and it can be downsized compared to conventional vacuum cleaners.

  Furthermore, since the vacuum cleaner for the construction site uses a sensor-type capacitive submersible pump for the drainage submersible pump 5, erroneous detection is extremely difficult to occur. Can be prevented. When the sensor detection unit 5c detects an abnormally high water level, it is determined that the drainage hose 58 is clogged or the drainage submersible pump 5 is abnormal, and all operations are stopped to allow water to enter the suction device 7. Can be prevented.

  Further, since the vacuum cleaner for the construction site is fastened and fixed to the opening of the basket 2 by the tightening string 3a with the opening of the dewatering mesh bag 3 widened, the sucked muddy water is removed from the dewatering mesh bag. 3 can be reliably and well received.

  Further, the vacuum cleaner for the construction site has the main tank 4 and the pump tank 6 formed of stainless steel plates, so that it is not necessary to apply paint after cleansing (operation for removing dirt, rust, and old paint film). In addition, since the main tank 4 and the pump tank 6 are detachably attached to the movable carriage 1, it is possible to clean using shot blasting and to reduce the maintenance process. Further, since the cleaning inspection windows 24 and 35 that can be opened and closed are provided in the main tank 4 and the pump tank 6, the main tank 4 and the pump tank 6 can be cleaned easily and easily.

  Furthermore, since the vacuum cleaner for the construction site has a configuration in which the vacuum blower 46 and the motor 47 are assembled in the vertical direction on the movable carriage 1 and the vacuum blower 46 having a high heat generation temperature is disposed above the motor 47, the motor 47 does not receive heat radiation from the vacuum blower 46, and the temperature rise of the motor 47 can be suppressed.

  Further, in the construction site cleaner, when the vacuum level reaches a certain value when the vacuum blower 46 is operated, a safety valve (not shown) is automatically opened to take in a large amount of air. Further, heat generation of the vacuum blower 46 can be prevented. In addition, since the vacuum blower 46 is equipped with a safety valve, the output of the motor 47 can be used with MAX without reducing the number of rotations of the vacuum blower 46, and the suction force can be kept above a certain level even when sucking muddy water. it can.

  Further, the construction site cleaner has the silencer 50 disposed on the movable carriage 1 in the open state in the atmosphere and in a vertical posture, so that the heat radiation efficiency is improved. Moreover, since the outer peripheral surface of the silencer 50 is covered with a heat insulating material, burns due to heat generated by the silencer 50 can be prevented.

  Further, in the construction site vacuum cleaner, since the movable carriage 1 includes the six casters 14, it is difficult to remove the wheel into a groove or the like during traveling. Further, since the movable carriage 1 includes the removable or openable cover body 11 that covers the suction device 7, the maintenance of the suction device 7 can be performed easily and easily by opening the cover body 11.

  Further, in the vacuum cleaner for the construction site, the control panel 8 includes a forced drain switch for pumps (not shown) that operates the drain submersible pump 5 for a certain period of time. Very convenient for draining water after work repair. Further, since the control panel 8 is provided with an abnormality indicator lamp 56 that notifies an overload of the drainage submersible pump 5 and the suction device 7 and an abnormally high water level in the pump tank 6 by lighting and blinking, it is easy to limit the abnormal portion. Become.

  1 is a mobile cart, 2 is a basket, 3 is a mesh bag for dehydration, 3a is a tightening string, 4 is a main tank, 5 is a submersible pump for drainage, 5a, 5b and 5c are sensor detectors, 6 is a pump tank, 7 is Suction device, 8 is a control panel, 9 is a horizontal frame, 10 is a storage frame, 11 is a cover body, 12 is an operating lever, 13 is a hanging bracket, 14 is a caster, 18 is a tank body, 20 is an opening / closing lid, and 21a is a suction Mouth, 24 is a cleaning inspection window, 27 is a tank body, 29 is an opening / closing lid, 30a is a drainage port, 32a is an air discharge port, 33 is a Y-strainer, 35 is a cleaning inspection window, 36 is a water passage, 37 is Air passage 44, baffle plate 45, suction hose 45, vacuum blower 46, motor 47, muffler 50, operation push button 53, stop push button 54, indicator lamp 56, suction hose 57 58 is Water hose, the suction nozzle 59, the suction pipe 61, 61a is suction adjusting hole, 62 scraper nozzle, 63 is the slide member.

Claims (13)

  A portable mobile trolley (1), a main tank (4) provided on the mobile trolley (1), having a suction port (21a) for sucking muddy water, and separating the sucked muddy water into mud and water, The main tank (4) has a drain port (30a) for draining the separated water and an air drain port (32a) for discharging the sucked air. 4) A pump tank (6) for receiving the air in the interior and a movable carriage (1), and the muddy water is put into the main tank (4) by making negative pressure in the main tank (4) and the pump tank (6). A vacuum cleaner for a construction site comprising a suction device (7) for sucking and a control panel (8) provided on a movable carriage (1), wherein the main tank (4) is located inside the main tank (4). And has a number of holes open at the top A sket (2), and a dewatering mesh bag (3) that is detachably mounted in the basket (2) and that is open at the top for receiving muddy water sucked from the suction port (21a) and separating it into mud and water. The pump tank (6) is housed in the pump tank (6), and the water level detection method for draining the water accumulated in the pump tank (6) from the drain port (30a) is a sensor type drain. A vacuum cleaner for a construction site, characterized by being provided with an underwater pump (5).   The drainage submersible pump (5) includes three sensor detection units (5a), (5b), and (5c) having different heights for detecting three points of a stop water level, an operating water level, and an abnormally high water level. The vacuum cleaner for a construction site according to claim 1, wherein the vacuum pump is a capacitive submersible pump.   The basket (2) is a punching basket or mesh basket having an open top, and the dewatering mesh bag (3) is provided with a tightening string (3a) or a tightening band at the opening, The construction site according to claim 1, wherein the mesh bag (3) is fastened and fixed to the opening of the basket (2) by a fastening string (3a) or a fastening band in a state where the opening of the mesh bag (3) is widened. Vacuum cleaner.   The main tank (4) and the pump tank (6) are both formed of stainless steel plates and are detachably attached to the movable carriage (1). The tank bodies (18) and (27) are opened at the top. And openable and closable lids (20) and (29) that openably and closably open the openings of the tank bodies (18) and (27), and openable and closable cleaning provided at the lower ends of the tank bodies (18) and (27). The construction site cleaner according to claim 1, further comprising inspection windows (24) and (35).   Between the main tank (4) and the pump tank (6), a water passage (36) for guiding water separated in the main tank (4) into the pump tank (6), and in the main tank (4) And an air passage (37) for guiding the air sucked together with the muddy water from the main tank (4) into the pump tank (6), and flows into the pump tank (6) from the air passage (37). The construction according to claim 1 or 4, further comprising a baffle plate (44) for reversing the air in the main tank (4) in the vertical direction and guiding the air to the air discharge port (32a). On-site vacuum cleaner.   The suction device (7) is connected to the air discharge port (32a) of the pump tank (6) via the suction hose (45), and makes the inside of the main tank (4) and the inside of the pump tank (6) have a negative pressure. A vacuum blower (46) for sucking muddy water into the main tank (4) and a motor (47) for driving the vacuum blower (46) are provided, and the vacuum blower (46) and the motor are provided on the movable carriage (1). The vacuum cleaner for a construction site according to claim 1, wherein a vacuum blower (46) having a high exothermic temperature is arranged above the motor (47).   The cleaning for a construction site according to claim 6, wherein a Y-type strainer (33) is interposed between the suction hose (45) and an air discharge port (32a) of the pump tank (6). Machine.   The said vacuum blower (46) is provided with the safety valve which takes in a large amount of air automatically, when the usable range of a vacuum blower (46) is exceeded, It is for construction sites of Claim 6 characterized by the above-mentioned. Vacuum cleaner.   A silencer (50) is connected to the discharge port of the vacuum blower (46), and the silencer (50) is disposed on the moving carriage (1) in an open state and in a vertical posture, The vacuum cleaner for a construction site according to any one of claims 6, 7, and 8, wherein the outer peripheral surface of the silencer (50) is covered with a heat insulating material.   A suction nozzle (59) is connected to the suction port (21a) of the main tank (4) via a flexible suction hose (57), and also to the drain port (30a) of the pump tank (6). A vacuum cleaner for a construction site according to any one of claims 1, 4, 5 and 6, characterized in that a flexible drain hose (58) is connected.   The suction nozzle (59) is provided at the tip of the suction pipe (61) and the suction pipe (61) connected to the tip of the suction hose (57), and is a slit-like suction port having a wider width at the tip. A suction adjustment hole (61a) is formed in the proximal end portion of the suction pipe (61), and the suction adjustment hole (61a) is formed at the proximal end of the suction pipe (61). The vacuum cleaner for a construction site according to claim 10, wherein the vacuum cleaner can be opened and closed by a cylindrical slide member (63) slidably fitted on the part.   The movable carriage (1) includes a horizontal frame (9), a rectangular parallelepiped accommodation frame (10) which is erected on the horizontal frame (9) and accommodates the suction device (7), and an accommodation frame (10). A removable or openable / closable cover body (11) that covers at least the upper surface and the left and right side surfaces, and forms a room in which the suction device (7) is accommodated, and an operation lever (12) provided on the accommodation frame (10), A plurality of suspension fittings (13) provided at the upper end of the housing frame (10) and at least six casters (14) provided on the lower surface of the horizontal frame (9) are provided. Vacuum cleaner for construction site described in 1.   The control panel (8) includes at least a forced drain switch for a pump that operates at least a submersible pump for drainage (5) for a certain period of time, and an operation push button (53) that operates a submersible pump for drainage (5) and a suction device (7). A stop push button (54) for stopping the submersible pump for drainage (5) and the suction device (7), an overload of the submersible pump for drainage (5) and the suction device (7), and a pump tank (6) The vacuum cleaner for a construction site according to claim 1, further comprising an abnormal indicator lamp (56) for notifying an abnormally high water level by lighting and flashing.

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