A system for holding at least one object to be held in a shaft-type building structure, comprising: a holding device, which in turn comprises at least a first holding device element having a holding portion for holding the holding device on a shaft-type building structure and at least a second holding device element having a second holding portion for holding the holding device on a shaft-type building structure. The at least second holding device element is movably mounted between a first operating position, in which the holding device can be or is held on a shaft-type building structure by means of the second holding device element, and a second operating position, in which the holding device cannot be or is not held on a shaft-type building structure by means of the second holding device element.

A hydrovac unit with a mud tank and water tank arranged symmetrically, so that the center of gravity does not substantially shift forwards or backwards during operation. The mud tank may be located inside the water tank. The mud tank may be supported and reinforced by external ribs, which may be fixed to the mud tank. The water tank may be formed by a rear face attached to the mud tank and a cylinder portion, the mud tank and rear face sliding into the cylinder portion for assembly and secured in place. The contents of the hydrovac unit may be dumped by tilting using a hoist. The tank assembly may be heated and insulated.

A hydrovac unit with a mud tank and water tank arranged symmetrically, so that the center of gravity does not substantially shift forwards or backwards during operation. The mud tank may be located inside the water tank. The mud tank may be supported and reinforced by external ribs, which may be fixed to the mud tank. The water tank may be formed by a rear face attached to the mud tank and a cylinder portion, the mud tank and rear face sliding into the cylinder portion for assembly and secured in place. The contents of the hydrovac unit may be dumped by tilting using a hoist. The tank assembly may be heated and insulated.

A pump-storage device comprises a treatment container including an interior separated by a partitioning board into an upper chamber and a lower chamber intercommunicating with the upper chamber via a first intercommunication port. An inlet intercommunicates with the upper chamber. A second intercommunication port intercommunicates the lower chamber with an outside. A first control valve controls intercommunication between the upper and lower chambers. A second control valve controls intercommunication between the upper chamber and a gas suction source. An actuation rod extends through the first intercommunication port. A first fixing block, a second fixing block, and a third fixing block are mounted from top to bottom in sequence on the actuation rod. An upper stop plate is disposed between the first and second fixing blocks. A lower stop plate is disposed between the second and third fixing blocks. The upper and lower stop plates are elastically supported.

A pump-storage device comprises a treatment container including an interior separated by a partitioning board into an upper chamber and a lower chamber intercommunicating with the upper chamber via a first intercommunication port. An inlet intercommunicates with the upper chamber. A second intercommunication port intercommunicates the lower chamber with an outside. A first control valve controls intercommunication between the upper and lower chambers. A second control valve controls intercommunication between the upper chamber and a gas suction source. An actuation rod extends through the first intercommunication port. A first fixing block, a second fixing block, and a third fixing block are mounted from top to bottom in sequence on the actuation rod. An upper stop plate is disposed between the first and second fixing blocks. A lower stop plate is disposed between the second and third fixing blocks. The upper and lower stop plates are elastically supported.

A large bore mobile vacuum system is used with special large bore vacuum adapters to enable a method and system for cleaning ground tanks used to store wastewater. The ground tank cleaning method and system may be safer and more efficient that conventional methods by enabling a human operator to physically remain outside of the ground tank, while preventing the contents of the ground tank from being exposed to the environment during the ground tank cleaning.

Embodiments of the present invention include a hose handling system having a hose guide plumbed via a wash line to a fluid delivery device. The hose guide includes a pulley installed on a frame member, and a spray nozzle adapted to dispense a wash mixture. The hose guide is adapted to guide a hose as the hose is inserted into or withdrawn from a manhole, with the hose traversing the pulley. The wash mixture can be delivered through a wash line to the hose guide, which sprays the wash mixture on the hose in order to reduce or eliminate gross contamination or microbial contamination on the hose. The wash mixture typically, but not necessarily, has a freezing point below 32° F. and includes: a quaternary ammonium compound, an alcohol or glycol, an alcohol ethoxylate, and a fragrance.

Disclosed are a bailer-type long-shaft pump (100) and an associated pump station (200). The long-shaft pump comprises a bailer vehicle (110), a long shaft (120), a bearing (130), a transmission device (140) and an electric motor (150). One end of the long shaft (120) successively passes through the bearing (130) and the transmission device (140) so as to be in transmission connection with a drive shaft of the electric motor (150). The pump station (200) comprises a pump station foundation (210), several equipment rooms (231) transversely distributed at intervals and constructed on the pump station foundation (210), and two ends of the long shaft (120) are supported on side walls of two adjacent equipment rooms. The bailer-type long-shaft pump achieve large water flow and low lift, the pump station is space-saving, has shorter construction cycle, and reduces investment and operation costs.

Disclosed are a bailer-type long-shaft pump (100) and an associated pump station (200). The long-shaft pump comprises a bailer vehicle (110), a long shaft (120), a bearing (130), a transmission device (140) and an electric motor (150). One end of the long shaft (120) successively passes through the bearing (130) and the transmission device (140) so as to be in transmission connection with a drive shaft of the electric motor (150). The pump station (200) comprises a pump station foundation (210), several equipment rooms (231) transversely distributed at intervals and constructed on the pump station foundation (210), and two ends of the long shaft (120) are supported on side walls of two adjacent equipment rooms. The bailer-type long-shaft pump achieve large water flow and low lift, the pump station is space-saving, has shorter construction cycle, and reduces investment and operation costs.

An apparatus for cleaning waste collection systems of solid materials. The apparatus is capable of cleaning waste systems in two known ways. First, a pumping method uses normal and injected water flow to suspend the solids in a slurry. A submersible pump moves the slurry from a collection point up to a pressurized container where the water content of the slurry is decanted and reused as injection water while the particulate material settles to the bottom of the pressurized container. Second, a vacuum system may be used to move the slurry from the waste system to the waste container. The vacuum system creates a negative pressure differential, causing material to be pulled through a vacuum tube and into the waste container. When the container becomes substantially full of solid particles, it may be emptied at a dumpsite.