The invention discloses a rotation exhausting type aeration tank for a municipal wastewater treatment. The aeration tank comprises a tank body. A second rotation shaft is rotatingly arranged on the center of a top plate. Two first rotation shafts are symmetrically and rotatingly arranged on the external sides of two fixing racks in the tank body. The second rotation shaft is connected to the firstrotation shafts in a transmission mode through two belts. A third rotation shaft and a fourth rotation shaft are arranged in the tank body. The left sides and right sides of the third rotation shaftand the fourth rotation shaft are rotatingly connected to two fixing racks. The third rotation shaft is rotatingly connected to the lower end of the second rotation shaft through a bevel gear set. A fifth rotation shaft is rotatingly arranged between two fixing racks. The lower end of the fifth rotation shaft is rotatingly connected to the fourth rotation shaft through a bevel gear set. The thirdrotation shaft and the fourth rotation shaft are both evenly provided with a plurality of valves. The aeration tank can fully contact the air, which is blown into the aeration tank by a blower, with water, the oxygen content of water is increased, and thus the aeration effect is strengthened.

Rotation exhausting type aeration tank for municipal wastewater treatment

The invention belongs to the technical field of top-down main body structure construction, and particularly relates to a top-down concrete structure gap waterproof device and a construction method. Two ends of a construction top-down structure are provided with inclined openings towards a soil facing layer in a downward mode. A steel plate water stopping belt, a grouting pipe and a water scenarioexpansion water stopping strip are embedded. An outer convex triangular wedge-shaped template is arranged at a lower structure pouring concrete inlet, and secondary compensating grouting is carried out through a grouting pipe after concrete is solidified. The top-down concrete structure gap waterproof device and the construction method have the beneficial effects that the bearing capacity, leakageprevention and safety of a top-down concrete structure in a tunnel are solved, and the cost of maintenance, manpower and material resources in the later period is saved.

Top-down concrete structure gap waterproof device and construction method

The present invention relates to a grouting method for reinforcing a joint arising during the construction of a building. More specifically, according to a building joint grouting method, as a stiffener is conveniently injected to prevent a water leak from a joint part which is a junction part between preplaced concrete and post-placed concrete, constructability and economic feasibility can be promoted. Meanwhile, even for work in the wintertime, a junction characteristic between the stiffener and a joint surface between the preplaced concrete and post-placed concrete is improved. Thus, the joint part between the preplaced concrete and post-placed concrete can be reinforced. Furthermore, as a foundation structure is stably constructed, sinkholes can be prevented, which can lead to promoting the safety of a pedestrian or a vehicle driver driving on a road.

Grouting method for joint portion of concrete structure to prevent sinkhole

The present invention relates to a top-down construction method of an underground structure using a grouting method for reinforcing a joint generated when a building is constructed and, more specifically, to a top-down construction method of an underground structure of a building using a joint grouting method, which simply injects a reinforcing material (filler) such as grout so as to prevent cracks in a joint between pre-placed concrete and post-placed concrete to promote constructability and economic feasibility and more stably constructs columns of a foundation structure to prevent a sinkhole phenomenon.

Top-down method for underground structure to prevent sinkhole

Microbubble-generated mixed aerator

The present invention relates to a grouting construction method for reinforcing a joint generated when constructing a building and an underground structure top-down joint grouting construction method using the same, and more specifically, to a building joint grouting construction method, which efficiently implements injection of a reinforcing material with respect to a joint portion to be possible to promote constructability and economic feasibility, and an underground structure top-down joint grouting construction method using the same.

Grouting method for joint portion of concrete structure in construction and top-down joint grouting method for underground structure using the same

The present invention relates to an apparatus for preventing precipitation of sludge, agitating liquid and aerating micro bubbles in a liquid storage tank, which increases the dissolved oxygen by aerating micro bubbles in liquid within a tank storing liquid components on or under the ground, and agitates the liquid to prevent a phenomenon of precipitating and piling sludge at the lower part of the tank so as to discharge the liquid at a homogeneous concentration The apparatus for preventing precipitation of sludge, agitating liquid and aerating micro bubbles in a liquid storage tank comprises a tank for agitating, aerating and storing liquid components of stock farming sewage and wastewater, agricultural and domestic sewage and wastewater, or industrial sewage and wastewater; a first pipeline for flowing the liquid in the tank to outside by pumping; a pump for pumping so as to flow the liquid in the tank through the first pipeline; an oxygen supplier for supplying highly concentrated oxygen to the liquid pumped by the pump to form micro bubbles; a second pipeline for flowing the liquid having micro bubbles into the tank by the pump and consisting of a flexible hose; and an agitating and aerating device for floating the precipitated sludge by spraying the liquid transferred through the second pipeline to the lower part of the tank so as to mix with the liquid, rotating through the water pressure supplied from the pump and performing a horizontally reciprocating motion to agitate and aerate the liquid in the tank

Apparatus for preventing precipitation of sludge, agitating liquid and micro bubble aerator in liquid storage tank

PURPOSE: A device of collecting a solid sludge is provided to increase a collecting efficiency of a sludge by collecting the sludge over the entire bottom of a storage bath. CONSTITUTION: A device of collecting a solid sludge consists of a main crane boom (110), a sub-crane boom (120), a rotary crane boom (130), a sludge sucking unit (300), and a control unit. The rotary crane boom is combined to one side of the sub-crane boom and rotates in a left and right direction. The sludge sucking unit is installed on the rotary crane boom and sucks solid materials from the bottom of a storage bath by moving along a longitudinal direction of the rotary crane boom. The sucked solid materials are supplied to the outside. The control unit sucks solid materials from the bottom of the storage bath by rotating the rotary crane boom back and forth in a predetermined radius and successively moving the sludge sucking unit along a longitudinal direction of the rotary crane boom.

Pickup-device for solidity sludge

The present invention relates to a variable filler to support a column-type soil retaining wall, which is installed between a soil retaining wall and a deck plate constructed on a ground excavation surface of various kinds of civil and architectural construction sites. In particular, the variable filler requires a space required for arranging a rebar and deposit concrete during bottom-up construction for an underground soil retaining wall space, placed between a structure slab and a retaining wall (temporary wall) before a vertical member, which is the weakest portion in a method to construct an underground structure in a top-down type, by the bottom-up construction is completed and, at the same time, plays a role of transferring soil pressure of the soil retaining wall to the slab structure. Accordingly, the variable filler is easily installed, thereby providing construction convenience, improving supporting force, and being easily installed regardless of an interval between the soil retaining wall and the deck plate, which is uneven in a site or among sites.

Variable filler for supporting column-type wall

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Grouting method for joint portion of concrete structure in construction and top-down joint grouting method for underground structure using the same

Apparatus for preventing precipitation of sludge, agitating liquid and micro bubble aerator in liquid storage tank

Pickup-device for solidity sludge

Variable filler for supporting column-type wall