JP2008297834A - Fixed sucking/conveying device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixed sucking/conveying device capable of stably maintaining sand discharging performance by properly controlling the sediment deposited on the bottom of a large-scale reservoirs including dam lakes during the operating period over a long period of time. <P>SOLUTION: An opening/closing device 11 having pumping function is installed between a sand discharge tube body 1 and a suction port 3. Obstruction can be collapsed by generating pulsating flow. The sucking/conveying device can be easily maintained and operated for a long period by separating the opening/closing device 11 from the sand discharge tube body 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an apparatus for sucking and conveying sand mud accumulated on a water bottom.

In a large-scale reservoir including a dam lake, a hydropipe disclosed in Japanese Patent Application Laid-Open No. 2002-294677 and a multi-purpose disclosed in Japanese Patent Application Laid-Open No. Hole suction sand pipes are known. Structurally, in both cases, a plurality of suction ports are provided in the axial direction on the lower surface of the pipe, and sand is discharged using the movement of water due to the difference in water level. These devices are considered to be economically superior because they have a simple structure and basically do not require the energy required for sand removal.
JP 2002-294677 A Japanese Patent Laying-Open No. 2005-2609

  However, the question remains whether hydropipe is a technology that can always reproduce stable operation through repeated use. Furthermore, it cannot be said that a clear measure has been established for both technologies in the block and in the vicinity of the suction port. In addition, since the multi-hole suction sand pipe has an inlet opening / closing device directly under the sand discharging pipe, there is a problem in maintenance and inspection work including replacement work of the opening / closing device in a long-term operation.

  In the present invention, a space is created between the suction port and the sand discharge pipe by providing the suction port from the sand discharge pipe main body, and the selection of the mechanical structure of the switchgear including a general-purpose valve such as a gate valve can be expanded. . In the present invention, by using an opening / closing device having a pump function such as a plunger or a diaphragm for all of the suction ports, when an obstruction occurs, the opening / closing operation is repeated to generate a pulsating flow and collapse the obstruction portion. This is a suction conveyance device having a function of causing

  Furthermore, by providing a slide valve at the water inlet and closing the pressure of the pulsating flow generated by closing it in the sand pipe, it is possible to promote the collapse of the blockage.

  The suction port opening / closing device having the pulsating flow generation function of the present invention can solve the blockage which has been a problem of the fixed sand discharge pipe.

  Furthermore, since the suction port is provided outside the sand pipe main body, maintenance work including replacement of the switchgear becomes easy, so that long-term operation is possible.

  An overall schematic view of the present invention is shown in FIG. The sand pipe main body 1 is fixed away from the water bottom by the pile 6 and the cradle 7.

  The fixed sand discharge pipe main body 1 and the pipe on the discharge port side are connected by a universal joint 8 to correct a position error that occurs during installation.

  The normal operation of this apparatus is performed in a state where the sand mud 12 covers the sand discharge pipe as shown in FIG. 2 by natural sedimentation or sand collection.

  The water inlet 2 provided at the top of the vertical cylinder is normally closed by a slide valve disk 9. This prevents sand mud flowing during the standby period from entering the sand discharge pipe. By closing this slide valve, it is possible to keep the pressure of the pulsating flow used during the collapse operation of the blockage in the pipe and to prevent the lake from being polluted by backflow.

  4 and 5 show the opening / closing device 11 attached to the sand discharge pipe main body 1 as seen from a cross section B-B 'in FIG. FIG. 4A shows the closed state of the plunger type opening / closing device, and FIG. 4B shows the open state. FIG. 5A shows the closed state of the diaphragm type opening / closing device, and FIG. 5B shows the open state.

  In the structure of the plunger type opening / closing device, a packing 14 is attached to the plunger 13, a seal 16 is sandwiched between the valve body 15, and a lid 17 provided with a pressure port 18 is attached. A closed state is established by supplying pressurized water or air from the pressure port 18 to the room 19. In order to make it open, water or air fed into the room 19 is sucked into a negative pressure.

  The diaphragm type opening / closing device operates by performing the same operation with the diaphragm 20.

  In FIG. 1, the suction port 3 is arranged directly beside, but depending on the property of the deposit or the shape of the water bottom, a shape as shown in FIG. 6 is possible. 6 (a), the suction port 3 is applied obliquely from below, FIG. 6 (b) is applied from directly below, and FIG. 6 (c) is applied to sand removal from a place closer to the water bottom.

  In order to start the sand removal operation, the water inlet 2 is first opened as shown in FIG. 2B by the actuator 10 that drives the slide valve disk 9 with water pressure or pneumatic pressure.

  Next, the valve 5 provided at the discharge port 4 is opened and water is passed through the sand discharge pipe.

  After confirming the water flow, the optional opening / closing device 11 is opened, and the sand mud 12 accumulated from the suction port 3 is sucked and conveyed to discharge the sand. Depending on the sand removal plan, it is possible to open several inlets at the same time.

  When the blockage occurs, the water inlet 2 is closed and the valve 5 is opened to allow water to pass. In the case of intravascular blockage, the upstream switchgear closest to the blockage is actuated to collapse the blockage. The blockage at the suction port operates the opening / closing device at the blockage location to collapse the blockage.

  In the case of large-scale blockage near the suction port that requires sputum that is expected to occur in the future by repeated use, a hole is dug outside the suction port and the switchgear is operated to cause the blockage. The function of the device can be restored by dropping excessive deposits.

  With this method, even when dredging, accidents that damage the sand discharge pipe do not occur.

Schematic diagram of fixed sand discharge pipe State diagram to start sand removal Structure of water inlet Structure of plunger type switchgear Structure diagram of diaphragm type switchgear Inlet shape

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sand discharge pipe main body 2 Water inlet 3 Inlet 4 Discharge 5 Valve 6 Pile 7 Pedestal 8 Universal joint 9 Slide valve disk 10 Actuator 11 Opening and closing device 12 Sand sediment 13 Plunger 14 Packing 16 Seal 17 Lid 18 Pressure port 19 Room 20 Diaphragm

Claims (3)

  An apparatus for sucking, transporting and removing sand mud accumulated on the bottom of the water, characterized in that an opening / closing device having a pulsating flow generation function is provided outside the sand discharge pipe main body at the suction port.   A suction conveyance device for assisting the function of claim 1 by providing a slide valve at a water inlet of the sand discharge pipe.   A suction conveyance device having an opening and closing device that operates with a single pipe by pressurizing and sucking each suction port with a fluid such as water or air.

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