JP3193016U - Residual concrete recovery equipment for concrete pump truck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily collect and clean residual concrete in a hopper after a concrete pump vehicle finishes concrete placing work at a construction site, and to collect contaminated water generated by the cleaning without discharging it to the site. Residual concrete recovery equipment is provided. SOLUTION: A device for collecting residual concrete in a hopper 3 provided in a concrete pump truck after the concrete placing work is completed, and a discharge port 4 and a discharge port 4 formed at the bottom of the hopper 3 are provided. A pipe structure 8 having a shutter 5 for opening and closing, a take-in port 6 for taking in residual concrete from a discharge port 4, and a discharge port 7 for discharging the taken-in residual concrete to a predetermined residual concrete processing location, and a pipe structure. It includes a screw mechanism 9 that is housed inside the body 8 and conveys residual concrete taken in from the intake port 6 toward the discharge port 7, and a hydraulic motor 10 that rotationally drives the screw mechanism 9. [Selection diagram] Fig. 2

Description

  The present invention relates to a residual concrete recovery device for a concrete pump truck that can easily recover and wash the concrete (residual concrete) remaining in the hopper at the rear of the vehicle body after the concrete pump truck has placed concrete at a construction site.

  When a concrete pump truck performs concrete placement work at the construction site, concrete is put into the hopper provided at the rear of the concrete pump truck body from the mixer truck (raw concrete truck), and the concrete in the hopper is installed in the pump truck. A concrete pump (piston pump or the like) is pumped through a pumping pipe and discharged from the tip of the pumping pipe to the placement site. It is necessary to remove and clean the concrete remaining in the pressure feed pipe and the concrete remaining in the hopper in preparation for the next work after the placement work is completed.

  The concrete remaining inside the pressure feeding pipe is returned to the mixer truck from the tip of the pressure feeding pipe by the air pressure generated during the idle operation of the concrete pump. Also, the sponge is fed from the hopper into the pressure feeding pipe, water is supplied into the hopper, the concrete pump is operated, the sponge is pushed by the water pressure / air pressure generated at that time, and the residual concrete is returned from the tip of the pressure feeding pipe to the mixer truck. Such a technique is also known (see Patent Document 1).

Japanese Patent No. 2895322

  On the other hand, the concrete remaining in the hopper is transferred to a construction unicycle vehicle (cat car) located below the opening at the bottom of the hopper, and is temporarily stored in the site for disposal. It is stored for a long time and is finally treated as industrial waste for a fee. Residual concrete in the hopper is usually about 2 cups in a cat car, roughly 0.3 to 0.4 m3 (cubic meters), but the total amount of the placement sites in various parts of Japan is huge and pumped. Contractors (general contractors, etc.) spend a large amount of money each month as industrial waste and are required to be reused.

  Moreover, the concrete stuck to the inner surface of the hopper without being discharged into the cat car is washed using water ejected from a handy nozzle provided in the concrete pump car. Alkaline contaminated water mixed with concrete produced by washing is discharged from the outlet at the bottom of the hopper to the ground and flows into the drainage groove (side groove) at the site. Since this causes environmental pollution, improvement is required.

  The purpose of the present invention, which was devised in view of the above circumstances, was to allow the residual concrete in the hopper to be easily recovered and washed after the concrete pump car finished the concrete placing work at the construction site, and the contamination caused by the washing. It is an object of the present invention to provide a residual concrete recovery device for a concrete pump truck that can recover water without discharging it to the site.

  The present invention devised to achieve the above object is a device for recovering residual concrete in a hopper provided at the rear part of the body of a concrete pump car after completion of the concrete placing work, and is provided at the bottom of the hopper. A pipe structure having a formed discharge port, a shutter that opens and closes the discharge port, and an intake port for taking in the residual concrete from the discharge port and a discharge port for discharging the taken-in residual concrete to a predetermined residual concrete processing location And a screw mechanism that conveys residual concrete contained in the pipe structure from the intake port toward the discharge port, and a hydraulic motor that rotationally drives the screw mechanism. A residual concrete recovery device for a pump car is provided.

  In the residual concrete collecting device for a concrete pump vehicle according to the present invention, the pipe structure has an intake port for taking in the residual concrete from the discharge port of the hopper and extends from below the hopper toward the bottom of the body of the concrete pump vehicle. A bottom pipe that is taken out, a post pipe that has a sheath portion that extends vertically upward through the vehicle body from the tip of the bottom pipe and is rotatable about the vertical axis, and forward from the top of the post pipe along the vehicle body And a boom pipe that has a discharge port at the tip and is supported so as to be tiltable in the vertical direction with respect to the sheath part.The screw mechanism includes a bottom screw housed inside the bottom pipe, a post pipe Post screws housed inside, boom screws housed inside the boom pipe, these bottom screws and post screws And a coupling member for interlocking the boom screw, hydraulic motors, the bottom screw, may be configured to drive any one of the post screws and the boom screw.

  In the residual concrete collecting apparatus for a concrete pump car according to the present invention, a turning drive mechanism for turning the boom pipe by turning the sheath portion around the vertical axis, and the boom pipe tilting up and down with respect to the sheath portion. And a tilting drive mechanism.

According to the concrete recovery device for a concrete pump car according to the present invention, the following effects can be exhibited.
(1) After the concrete pump car finishes the concrete placing work at the construction site, the residual concrete in the hopper is opened from the intake port into the pipe structure by opening the shutter of the discharge port formed at the bottom of the hopper. It is dropped and transported toward the discharge port by a screw mechanism provided inside the pipe structure, and discharged to a predetermined residual concrete processing location (for example, a hopper of a mixer car) and collected. Therefore, the cost for processing the residual concrete in the hopper as industrial waste can be reduced, and the residual concrete can be reused as new concrete, leading to a significant cost reduction.
(2) The concrete stuck to the inner surface of the hopper is washed using the water ejected from the handy nozzle provided in the concrete pump truck, and the alkaline contaminated water mixed with the concrete produced by the washing is left as described above. Like concrete, it falls into the pipe structure from the intake port, is transported through the pipe structure by a screw mechanism, and is discharged to a predetermined residual concrete processing location (for example, a hopper of a mixer car). Therefore, the contaminated water generated by washing the hopper can be collected without being discharged to the site, and environmental problems can be avoided.
(3) Residual concrete in the hopper and contaminated water generated by cleaning the hopper can be easily transferred to a predetermined residual concrete processing location (for example, a hopper of a mixer truck) by opening the shutter and driving the screw mechanism as described above. Since it can be collected and no special preparatory work for collection, such as changing pipes, is required, the burden on the worker is small and the working time can be shortened.
(4) Since the residual concrete and contaminated water are transported through the pipe structure by rotating the screw mechanism, the flow pressure in the pipe in the pipe structure is It is much weaker than Therefore, the useful life as an apparatus becomes long.
(5) The screw mechanism is driven by a hydraulic motor, and since the hydraulic motor can be driven by a hydraulic pump provided in the concrete pump car, no external power source is required to drive the screw mechanism. High convenience in the field.

It is explanatory drawing which shows the residual concrete collection | recovery apparatus of the concrete pump vehicle which concerns on one Embodiment of this invention, (a) is a side view, (b) is a rear view, (c) is a top view. FIG. 2 is a partially enlarged cutaway view of FIG. FIG. 3 is a view taken in the direction of arrow III in FIG. 2. FIG. 4 is a view taken along arrow IV in FIG. 2.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present specification and drawings, elements having substantially the same functions and configurations are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not shown. To do.

(Outline of residual concrete recovery device 1 for concrete pump truck)
1 (a), 1 (b), and 1 (c) show a residual concrete recovery device 1 for a concrete pump vehicle according to an embodiment of the present invention. This residual concrete recovery device 1 is mounted on a body (deck) 2 of a concrete pump car for placing concrete at a construction site, and a hopper 3 provided at the rear portion of the body 2 after completion of the concrete placing work. The residual concrete inside is collected.

  When a concrete pump truck performs concrete placement work at a construction site, concrete is put into a hopper 3 from a mixer truck (raw car, not shown), and the concrete in the hopper 3 is provided on the body 2 of the concrete pump truck. A concrete pump (piston pump or the like, not shown) is pumped through a pumping pipe (not shown) and discharged from the tip of the pumping pipe to the placement site. It is necessary to remove and wash the concrete remaining in the hopper 3 in preparation for the next work after the placing work is completed, and the residual concrete recovery apparatus 1 according to the present embodiment is used for this.

  As shown in FIG. 2 which is a partially enlarged cutaway view of FIG. 1A, FIG. 3 which is a view taken along the arrow III in FIG. 2, and FIG. 4 which is a view taken along the arrow IV in FIG. The residual concrete collecting device 1 of the pump car has a discharge port 4 formed at the bottom of the hopper 3, a shutter 5 that opens and closes the discharge port 4, and an intake port 6 that takes in the residual concrete from the discharge port 4. A pipe structure 8 having a discharge port 7 for discharging residual concrete to a predetermined residual concrete treatment site, and a residual concrete housed in the pipe structure 8 and taken in from the intake port 6 toward the discharge port 7 A screw mechanism 9 for conveying and a hydraulic motor 10 for rotationally driving the screw mechanism 9 are provided.

(Discharge port 4, shutter 5)
As shown in FIG. 2, a discharge port 4 for discharging the residual concrete in the hopper 3 downward is formed in the lowest part of the bottom of the hopper 3. The discharge port 4 is opened and closed by a shutter 5, and the shutter 5 is driven in the horizontal direction by a hydraulic cylinder 11. The hydraulic pressure for operating the hydraulic cylinder 11 is supplied from a hydraulic pump (not shown) originally provided in the concrete pump truck. Therefore, it is not necessary to separately prepare an external power source for opening and closing the shutter 5.

  The shutter 5 is opened and closed by operating an operation button on an operation panel (not shown), and is closed to store the ready-mixed concrete to be placed in the hopper 3 at the time of placing concrete, and the residual concrete in the hopper 3 after the placement is finished. Is opened from the discharge port 4 to the pipe structure 8. The shutter 5 is provided with an elastic seal made of rubber, resin, or the like in order to prevent moisture contained in the ready-mixed concrete from leaking out from the gap with the discharge port 4 when the discharge port 4 is closed at the time of placing. Yes.

(Pipe structure 8)
As shown in FIGS. 2, 3, and 4, the pipe structure 8 has an intake 6 for taking in residual concrete from the discharge port 4 of the hopper 3, and below the body 2 of the concrete pump vehicle from below the hopper 3. A bottom pipe 8a extending obliquely forward toward the front, a post pipe 8b extending vertically upward from the tip of the bottom pipe 8a through the vehicle width direction end, and an upper part of the post pipe 8b And a boom pipe 8c extending forward along the vehicle body 2 and having a discharge port 7 at the tip. The post pipe 8b has a sheath part 12 that is rotatable about a vertical axis, and the boom pipe 8c is supported so as to be tiltable in the vertical direction with respect to the sheath part 12.

  As shown in FIG. 2, the bottom pipe 8a and the post pipe 8b are connected via a lower elbow pipe 13 (or L-shaped pipe). As shown in FIGS. 2 and 3, the post pipe 8 b includes a pipe body 14 that is vertically supported and fixed to the vehicle body 2, and a sheath portion 12 that is rotatably attached to the pipe body 14 about a vertical axis. . The rotation range of the sheath portion 12 is 280 degrees in the present embodiment, but is not limited to this range. As shown in FIG. 1 (b), the post pipe 8 b penetrates the vehicle width direction end of the vehicle body 2 and extends vertically upward, so that various types of concrete pump cars provided in the approximate center of the vehicle body 2 are used. It does not interfere with equipment (concrete pumps, pressure feed pipes, etc.) and does not impede the functions of these equipment.

  As shown in FIGS. 3 and 4, the sheath portion 12 of the post pipe 8 b and the boom pipe 8 c are connected via an upper elbow pipe 15. The upper elbow pipe 15 is provided with a fixed joint 16 that is fastened and fixed to the sheath portion 12, and a rotary joint 17 that supports the boom pipe 8c so as to be tiltable in the vertical direction. In the present embodiment, the tilt range of the boom pipe 8c is set to −10 degrees to 45 degrees with respect to the horizontal, but is not limited to this range. The rotary joint 17 is provided with a water stop seal (not shown). Further, as shown in FIG. 2, a discharge port 7 is formed at the tip of the boom pipe 8c for discharging the residual concrete taken from the hopper 3 to a predetermined residual concrete processing portion (for example, a hopper of a mixer car). ing.

  According to the above configuration, the sheath part 12 of the post pipe 8b is rotated around the vertical axis, and the boom pipe 8c is tilted in the vertical direction with respect to the sheath part 12, as shown in FIG. Since the boom pipe 8c turns around the vertical axis and the boom pipe 8c tilts in the vertical direction as shown in FIG. 1A, it can cope with any situation. That is, by appropriately turning and tilting the boom pipe 8c, the discharge port 7 of the boom pipe 8c can be aligned with the hopper of the mixer truck regardless of the stop position of the mixer truck with respect to the vehicle body 2 of the concrete pump truck. In this embodiment, a 5-inch iron pipe is used for the bottom pipe 8a, the post pipe 8b, and the boom pipe 8c. However, the size and material are not limited thereto. Cast products are used for the upper elbow tube 15 and the lower elbow tube 13.

(Screw mechanism 9)
As shown in FIG. 2, the screw mechanism 9 includes a bottom screw 9a housed inside the bottom pipe 8a, a post screw 9b housed inside the post pipe 8b, and a boom housed inside the boom pipe 8c. It has the screw 9c and the interlocking member (bevel gear) which interlock | cooperates these bottom part screw 9a, the post screw 9b, and the boom screw 9c.

  The bottom screw 9 a includes a center rod 18 and a spiral blade 19 attached to the center rod 18. The center rod 18 is supported at the base end by the bearing 20, and the tip end is supported by the bearing 21 through the partition wall 20 provided in the lower elbow tube 13. A bevel gear 22 is attached to the tip of the center rod 18. An elastic member (such as rubber or resin, not shown) is attached to the peripheral edge of the spiral blade 19 to narrow the gap with the inner peripheral surface of the bottom pipe 8a as much as possible.

  Similarly, the post screw 9b includes a center rod 23 and a spiral blade 24 (including the above-described elastic member). As shown in FIG. 2, the lower end of the center rod 23 penetrates a partition wall 25 provided in the lower elbow tube 13 and is supported by a bearing 26. The upper end of the center rod 23 is an upper portion as shown in FIG. A partition wall 27 provided in the elbow pipe 15 is passed through and supported by a bearing 28. As shown in FIG. 2, a bevel gear 29 that meshes with the bevel gear 22 of the bottom screw 9 a is attached to the lower end of the center rod 23, and a bevel gear 30 is attached to the upper end of the center rod 23.

  Similarly, the boom screw 9c includes a center rod 31 and a spiral blade 32 (including the elastic member described above). As shown in FIG. 4, the base end of the center rod 31 penetrates a partition wall 33 provided in the boom pipe 8c and is supported by a bearing 34. The tip of the center rod 31 is a bearing as shown in FIG. 35 is supported. As shown in FIG. 4, a bevel gear 36 is attached to the proximal end of the center rod 31. The boom screw 9c is interlocked with the post screw 9b via an elbow screw 9d accommodated in the upper elbow pipe 15, as shown in FIGS.

  As shown in FIGS. 3 and 4, the elbow screw 9d includes a center rod 37 and a spiral blade 38 (including the above-described elastic member). As shown in FIG. 3, one end of the center rod 37 penetrates a partition wall 39 provided in the upper elbow pipe 15, and is supported by a bearing 40. The other end of the center rod 37 is as shown in FIG. A partition wall 41 provided in the boom pipe 8c is passed through and supported by a bearing 42. As shown in FIG. 3, a bevel gear 43 that meshes with the bevel gear 30 of the post screw 9b is attached to one end of the center rod 37, and the boom screw 9c is attached to the other end of the center rod 37 as shown in FIG. A bevel gear 44 that meshes with the bevel gear 36 is attached.

  According to the above configuration, the bottom screw 9a, the post screw 9b, and the boom screw 9c are all interlocked by the bevel gears 22, 29, 30, 43, 44, and 34.

(Hydraulic motor 10)
As shown in FIGS. 2 and 4, the hydraulic motor 10 is attached to the proximal end of the boom pipe 8c, and rotationally drives the center rod 31 of the boom screw 9c. The hydraulic pressure that activates the hydraulic motor 10 is supplied from a hydraulic pump (not shown) that is originally provided in the vehicle body 2 of the concrete pump car, and an external power source for driving the screw mechanism 9 is provided. There is no need to prepare it separately. When the boom screw 9c is rotated by the hydraulic motor 10, the elbow screw 9d, the post screw 9b, and the bottom screw 9a rotate in synchronism, and the screw mechanism 9 is appropriately driven as a whole.

  For example, if the bevel gear is abolished and a hydraulic motor is provided for each screw, the number of installed hydraulic motors will increase and the cost will increase, and complicated control will be required to synchronize and synchronize these hydraulic motors. In the present embodiment, since one hydraulic motor 10 is sufficient, the cost is low, and complicated control for synchronization is not required. The hydraulic motor 10 is not limited to the one that drives the boom screw 9c, but may be one that drives any one of the bottom screw 9a, the post screw 9b, and the elbow screw 9d. The hydraulic motor 10 is normally rotated, reversely rotated, and stopped by operating an operation button (not shown) on an operation panel.

(Turning drive mechanism 45)
As shown in FIGS. 1 (a), 1 (b), 1 (c), and 2, the sheath portion 12 of the post pipe 8b is rotated around the vertical axis by the turning drive mechanism 45. It has become. The turning drive mechanism 45 includes an external gear 46 attached to the sheath portion 12 and an electric motor 48 including a pinion 47 that is supported by the vehicle body 2 and meshes with the external gear 46. The electric motor 48 is normally rotated, reversely rotated, and stopped by operating an operation button on an operation panel (not shown), and when the electric motor 48 is rotated forward and backward, the electric motor 48 is rotated as shown in FIG. As shown in c), the boom pipe 8c rotates about the vertical axis. Electric power for driving the electric motor 48 is supplied from the battery originally provided in the body 2 of the concrete pump car, and it is necessary to prepare an external power source for driving the turning drive mechanism 45 separately. There is no.

(Tilt drive mechanism)
As shown in FIG. 1A, FIG. 1B, FIG. 1C, and FIG. 2, the boom pipe 8c is tilted up and down by a tilt drive mechanism 49. The tilting drive mechanism 49 includes a hydraulic cylinder 50 having one end attached to the boom pipe 8c and the other end attached to the sheath portion 12 of the post pipe 8c. The hydraulic cylinder 50 can be expanded and contracted by operating an operation button on an operation panel (not shown), and the boom can be expanded and contracted by expanding and contracting the hydraulic cylinder 50 as shown in FIG. The pipe 8c tilts in the vertical direction with respect to the sheath portion 12. The hydraulic pressure for operating the hydraulic cylinder 50 is supplied from the hydraulic pump originally provided in the body 2 of the concrete pump car, and it is necessary to prepare an external power source for driving the tilting drive mechanism. There is no.

(Action / Effect)
As shown in FIG. 2, according to the residual concrete collecting apparatus 1 for a concrete pump vehicle according to the present embodiment, after the concrete pump vehicle finishes the concrete placing work at the construction site, the residual concrete in the hopper 3 3 is opened into the bottom pipe 8a from the intake port 6 by opening the shutter 5 of the discharge port 4 formed at the bottom, and the hydraulic motor 10 is driven to connect the bottom screw 9a, post screw 9b, and boom screw 9c. By operating in conjunction with each other, it is conveyed toward the discharge port 7 through the post pipe 8b and the boom pipe 8c, and is discharged to a predetermined residual concrete processing portion (for example, a hopper of a mixer car) and collected. Therefore, the cost for treating the residual concrete in the hopper 3 as industrial waste can be reduced, and the residual concrete can be reused as new concrete, leading to a significant cost reduction.

  The concrete stuck to the inner surface of the hopper 3 is washed using water ejected from a handy nozzle (not shown) provided in the body 2 of the concrete pump car, and the alkaline contamination mixed with the concrete produced by the washing. The water falls into the bottom pipe 8a from the intake port 6 in the same manner as the residual concrete described above, and the bottom screw 9a, the post screw 9b, and the boom screw 9c are interlocked by the hydraulic motor 10 so that the post pipe 8b, the boom pipe It is conveyed toward the discharge port 7 through 8c, discharged to a predetermined residual concrete processing location (for example, a hopper of a mixer truck), and collected. Therefore, the contaminated water generated by cleaning the hopper 3 can be collected without being discharged to the site, and environmental problems can be avoided.

  As described above, residual concrete in the hopper 3 and contaminated water generated by washing the hopper 3 are opened as the shutter 5 and the screw mechanism 9 is driven by the hydraulic pump 10 to drive a predetermined residual concrete processing portion (for example, a mixer truck). Hoppers) can be easily collected and no special preparatory work for collection, such as changing pipes, is required, so the burden on the worker is small and the working time can be shortened. Specifically, the work that conventionally took about 60 minutes can be shortened to about 30 to 40 minutes.

  The screw mechanism 9 is rotated so that residual concrete and contaminated water are transported through the pipe structure 8 so as to be screw-fed. Compared with the inside of the pumping pipe at the time of concrete placement (when using a piston pump), it is much weaker. That is, while the screw mechanism 9 conveys residual concrete and contaminated water with static pressure by screw feeding, the piston pump at the time of placing concrete feeds concrete with dynamic pressure, so the flow in the pipe in the pipe structure 8 is reduced. The pressure is much weaker compared to the inside of the pressure feeding pipe when placing concrete. Therefore, the useful life as an apparatus becomes long.

  The screw mechanism 9 is driven by a hydraulic motor 10, and the hydraulic motor 10 can be driven by a hydraulic pump that is originally provided in the vehicle body 2 of the concrete pump car. Therefore, external power for driving the screw mechanism 9 is used. No source is required, and convenience is high on site.

  By turning the sheath portion 12 of the post pipe 8b around the vertical axis by the turning drive mechanism 45, the boom pipe 8c turns around the vertical axis as shown in FIG. By tilting the boom pipe 8c in the vertical direction, the boom pipe 8c tilts in the vertical direction as shown in FIG. That is, by appropriately turning and tilting the boom pipe 8c, the discharge port 7 of the boom pipe 8c can be aligned with the hopper of the mixer truck regardless of the stop position of the mixer truck with respect to the vehicle body 2 of the concrete pump truck. Residual concrete in the hopper 3 of the pump truck can be appropriately transferred to the hopper of the mixer truck.

  Further, since each screw 9a, 9b, 9c, 9d constituting the screw mechanism 9 is interlocked by the bevel gears 22, 29, 30, 43, 44, 34, a single hydraulic motor 10 is sufficient as a drive source. . Therefore, the cost is low, and complicated operation control of the drive source for synchronization is not required.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiments, and various types within the scope described in the claims of the utility model registration. It goes without saying that any modification or modification of the above belongs to the technical scope of the present invention.

  INDUSTRIAL APPLICABILITY The present invention can be used for an apparatus for recovering residual concrete in a hopper provided at the rear part of a concrete pump car body after completion of concrete placing work.

DESCRIPTION OF SYMBOLS 1 Residual concrete collection apparatus 2 of concrete pump vehicle Body 3 Hopper 4 Discharge port 5 Shutter 6 Intake port 7 Discharge port 8 Pipe structure 8a Bottom pipe 8b Post pipe 8c Boom pipe 9 Screw mechanism 9a Bottom screw 9b Post screw 9c Boom screw DESCRIPTION OF SYMBOLS 10 Hydraulic motor 45 Turning drive mechanism 49 Tilt drive mechanism

Claims (3)

A device for recovering residual concrete in a hopper provided at the rear of a concrete pump car body after completion of the concrete placing work,
A discharge port formed in the bottom of the hopper;
A shutter that opens and closes the outlet;
A pipe structure having an intake port for taking in the residual concrete from the discharge port, and having a discharge port for discharging the taken-in residual concrete to a predetermined residual concrete processing location;
A screw mechanism for conveying residual concrete accommodated in the pipe structure and taken in from the intake port toward the discharge port;
A hydraulic motor that rotationally drives the screw mechanism;
A residual concrete recovery device for a concrete pump car characterized by comprising: The pipe structure has an intake port for taking in residual concrete from the discharge port of the hopper, and extends from below the hopper toward the lower side of the body of the concrete pump car, and the bottom pipe A post pipe having a sheath portion extending vertically upward through the vehicle body from the tip and rotatable about a vertical axis; and extending forward from the top of the post pipe along the vehicle body to the tip A boom pipe having a discharge port and supported so as to be tiltable up and down with respect to the sheath part;
The screw mechanism includes a bottom screw housed in the bottom pipe, a post screw housed in the post pipe, a boom screw housed in the boom pipe, and the bottom screw and post screw. And an interlocking member that interlocks the boom screw,
The hydraulic motor drives any one of the bottom screw, the post screw, and the boom screw.
The residual concrete recovery device for a concrete pump truck according to claim 1. A turning drive mechanism for turning the boom pipe by turning the sheath portion around a vertical axis;
A tilting drive mechanism for tilting the boom pipe in the vertical direction with respect to the sheath portion;
The residual concrete recovery device for a concrete pump car according to claim 2.

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