33results about How to "Reduced demolition workload" patented technology

The invention belongs to the technical field of bridge construction, and particularly provides a support-free construction method of a steel-concrete composite beam concrete cast-in-place bridge deck.The method comprises the following steps of installing steel main beams and steel cross beams according to drawing requirements, and machining needed profiled steel plates or steel plates according to a transverse line type of a bottom surface of a bridge deck; laying processed profiled steel plates on an upper flange plate of the steel main beams section by section in a bridge direction; installing reinforcing steel bars in the bridge deck on the laid profiled steel plates; installing side molds on the two sides of the bridge deck; and pouring concrete on the profiled steel plates and on inner sides of side molds in the step 3) and curing. Problems that in the prior art, supports and formworks need to be disassembled after bridge deck construction is completed in support construction, and a disassembling workload is large are solved; and support-free construction is adopted, dismounting operation is not needed, high-altitude operation is not needed, a safety risk is reduced, a dismounting operation platform does not need to be built, construction cost is reduced, and construction efficiency is improved.

The invention relates to a sewage pipeline blocking device and a construction method thereof. The sewage pipeline blocking device is arranged on the wall of a working well and is used for sealing a pipeline. The sewage pipeline blocking device comprises a rubber plate, a water retaining steel plate and a reserved hole pipe which are arranged in sequence, wherein the rubber plate is attached to thewell wall; first preserved holes which are corresponding in positions are respectively formed in the water retaining steel plate and the rubber plate; and the reserved hole pipe communicates with thefirst preserved holes. According to the sewage pipeline blocking device, the water retaining steel plate is used for main blocking, performs sealing water stop in combination with the rubber plate, has a relatively good blocking effect, and can ensure the construction safety in an operation area; the reserved hole pipe can realize the continuous sewage transportation, and the transportation of intake sewage of sewage treatment plants does not need to be completely stopped; the dismantling workload in later period is small; the workload of underwater frogmen is effectively reduced; and the operating risk is reduced.

The invention discloses a method for passing through an abandoned roadway. The method for passing through the abandoned roadway comprises a method for allowing a coal face to pass through the abandoned roadway. The method for allowing the coal face to pass through the abandoned roadway comprises the following steps: S01: marking a first intersection area intersected with the coal face in the abandoned roadway in advance; S02: sequentially distributing at least two mutually-independent first support timber cribs along the advancing direction of the coal face in the first intersection area to support a first false roof; S03: allowing a coal cutter in the coal face to advance in a sectional way in the first intersection area to cut the first support timber cribs; and S04: allowing the coal cutter to sequentially advance according to the way in the step S03 until the coal cutter passes through the first intersection area. According to the method for passing through the abandoned roadway, the workload for dismounting the timber cribs is reduced by adopting the mutually-independent support timber cribs, the labor intensity of staff is alleviated, the workload is reduced, and the assuredprocessibility factor of the staff is improved.

The invention discloses a sliding type folding wallboard. The wallboard comprises a sliding type guide rail and at least two vertical unit plates, wherein the sliding type guide rail comprises at least two hollow connecting pipes which sequentially sleeve each other; the hollow connecting pipes are transversely arranged, and the head parts of the hollow connecting pipes are arranged in the tail parts of the adjacent hollow connecting pipes; vertical connecting shafts are disposed on the tail parts of the hollow connecting pipes, the unit plates are in one-to-one correspondence with the connecting shafts, and the unit plates are rotationally connected with the connecting shafts. The sliding type guide rail in the structure can provide relatively high strength, the unit plates can provide shielding, a steel frame structure does not need to be built again, plates or cloth does not need to be laid, and a large number of connecting pieces do not need to be installed on the site; when the structure serves as a large-scale wallboard of a large temporary building so that the workload, time consumption, labor cost and the like for dismantling the large temporary building can be reduced.

The invention belongs to the field of tunnel engineering, and particularly relates to a construction method for transverse expanding excavation conversion when a tunnel section suddenly changes to a large-span section. According to the construction method, when the tunnel section enters the transition section of the suddenly-changed large-span section, firstly a preceding pilot tunnel is excavated, and then excavation expands towards the arch part of the suddenly-changed large-span section while excavating a following pilot tunnel; then 90-degree straight turning pilot tunnel expanding excavation is conducted in the side wall direction, during expanding excavation, a portal support is added to serve as temporary protection, and a portal cross beam is installed outside the large-span section contour line in the line direction; and after excavation is conducted to the position of a side wall arch foot of the large-span section, an annular arch frame of the large-span section is erected on the lower side of a portal cross beam at a time. According to the construction method, the portal support is large in operation space, high in safety and convenient to construct, meanwhile, the portal cross beam is arranged on the outer side of a main tunnel primary support arch frame, extension or erection of the main tunnel annular arch frame is not affected, the portal cross beam and upright end wall portal vertical supports at the junction of the two sections can serve as permanent primary supports, and the dismantling workload of the temporary portal is reduced.

The invention provides a shallow-burying exposure construction method applicable to a hard rock tunnel with an extra large fracture surface. The excavated volume of soft soil exposed on the earth surface is compared with that of a first excavation part formed by means of a CD method, cover arch construction is conducted if the excavated volume of the soft soil is higher than that of the first excavation part, a benching tunneling method is adopted for excavation, and if the excavated volume of the soft soil is not higher than that of the first excavation part, the CD method is adopted for excavation; according to the CD method, the whole process is divided into four steps for excavation, correspondingly there are four parts to be supported, and backfill of the ground needs to be conductedin time after a second excavation part is completed; according to the benching tunneling method, the whole process is divided into three steps for excavation, and backfill of the earth surface is conducted after excavation of an upper bench is finished; side slopes of excavated soft soil are supported in time through bolt mesh spraying. The open excavation amount and grouting amount of the groundare decreased under the situation that the fracture surface of the tunnel is extra large, the adaptability is high, environmental pollution is small, the excavation speed is high, and economic benefits are remarkable.

The invention discloses a fining twisted steel-based lifting appliance and a lifting method thereof. The lifting appliance comprises a first fixed beam; fining twisted steel passes through the two ends of the first fixed beam through an anchor; the middle of the fining twisted steel passes through a second fixed beam through an anchor; a hydraulic jack is arranged above the second fixed beam; the top of the hydraulic jack is provided with a movable beam; and the fining twisted steel passes through the two ends of the movable beam through an anchor. The lifting method comprises the following steps of: welding the first fixed beam on a lifted object, and welding the second fixed beam on a fixed reference object; fastening the anchor on the movable beam and the anchor on the first fixed beam, and lifting the hydraulic jack; loosening the anchor on the movable beam, fastening the anchor on the second fixed beam, and retracting the hydraulic jack; and reciprocating the movable beam until the lifted object is in position. The fining twisted steel and the anchors are adopted to serve as the lifting appliances for the first time so as to lift equipment in a small space and avoid frequent replacement of stress groups.

The invention relates to the technical field of building construction structures, in particular to a water-stopping form board. The water-stopping form board comprises a flaky framework and is characterized in that a plurality of through holes are evenly distributed in the framework, first filling structures which can expand after water absorption are filled into the through holes, the first filling structures filled into the through holes and the framework form a planar form board structure without pores in the surface, and a waterproof structure with time effectiveness wraps the outer side of the form board formed by the framework and the first filling structures. The water-stopping form board is simple in structure, convenient in mounting and pouring, capable of greatly increasing concrete pouring efficiency, capable of increasing the water stopping effect at concrete gaps and worthy of popularization and does not need an additional new water-stopping structure.

The invention discloses a flue modification method and a flue anticorrosive structure. The flue modification method comprises: removing the original heat insulation layer and the inner liner layer ofa flue shell, and performing sandblasting, grinding and partial repairing on the inner wall of the flue shell; and then coating the inner wall of the flue shell with a primer layer, and after the primer layer is completely cured, adhering a glass brick to the primer layer with an adhesive to form a heat-insulating anti-corrosion layer. The flue anticorrosive structure comprises a flue shell, and is characterized in that the inner wall surface of the flue shell is covered with a heat-insulating anti-corrosion layer, and the heat-insulating anti-corrosion layer comprises a primer layer coveringthe inner wall surface of the flue shell and a glass brick attached to the primer layer with an adhesive. The invention utilizes the original concrete (brick) flue shell structure, and uses the superior anti-corrosion characteristics of the primer, the adhesive and the glass brick, thereby achieving the dual purpose of anti-corrosion and heat preservation in the wet flue gas environment, and provides a cost-effective flue modification structure with simple structure and an effective anti-corrosion layer.

The invention relates to a set of sealing equipment and construction technology in the LNG full containment tank vault air-blowing jacking process and belongs to the technical field of LNG full containment tank equipment. The equipment comprises a main seal and an auxiliary seal. The main seal comprises a plurality of main sealing plates (1) which are connected end to end in an overlapped mode, and the upper edges of the main sealing plates (1) are fixed to the lower surface of a tank top covering plate (7). The auxiliary seal comprises auxiliary sealing soft plates (2) connected to the lower portions of the main sealing plates (1) in an overlapped mode. According to the construction technology, after the main sealing plates (1) and the auxiliary sealing soft plates (2) are cut according to specific specifications, the main sealing plates (1) are fixed to the lower surface of the tank top covering plate (7) through a batter board (3) and wedges (4), the auxiliary sealing soft plates (2) are bonded to the lower edges of the main sealing plates (1), after sealing is qualified, enough air is introduced in, and then vault air-blowing jacking is completed. Through the sealing equipment and the construction technology in the LNG full containment tank vault air-blowing jacking process, the problems that a sealing system in the LNG full containment tank vault air-blowing jacking process is difficult to install, poor in sealing effect and high in requirement for a concrete outer tank wall are solved.

The invention provides an old retaining wall provided with a stretching buffer layer for treatment, and belongs to the technical field of pavement infrastructure engineering. The old retaining wall provided with the stretching buffer layer for treatment comprises a left underground layer, a right underground layer is fixedly connected to one side face of the left underground layer, and an existing retaining wall is fixedly connected to the inner wall of the left underground layer. The tensile buffer layer is arranged, the elasticity and the bearing capacity of a soil body are utilized, the pavement load is released, the situation that a newly-built road is damaged by the counter-acting force of an old retaining wall on the lower layer is avoided, meanwhile, the two-way double-layer reinforcing band is arranged, and the integrity and the adaptability of the tensile buffer layer can be improved. Internal stress and differential settlement caused by non-uniform materials of an old retaining wall on the lower layer, an original road bed and a surrounding backfill soil layer are effectively reduced, so that the strength of a newly-built pavement is better enhanced, and long-term use is facilitated.

The invention discloses a dismantling method for a hot galvanizing unit furnace nose. The method comprises the following steps that: a hot galvanizing unit halts, a zinc pot is dismantled, various types of media which enter the furnace nose stop being transferred, and are closed, the pipelines of various types of media are dismantled and marked, and the furnace nose is positioned on a halting position; a temporary bracket is manufactured and is assembled below the furnace nose; the temporary bracket is connected with a steel structure for hanging the furnace nose, stand columns are independently supported on a steel cross beam below a swinging mechanism and the pull rod cross beam of the furnace nose; a travelling crane and a steel beam are hoisted on the big cross beam of the furnace nose, the big cross beam is cut and dismantled and is hoisted to a storage area; a metal expansion joint is dismounted, and the expansion and contraction quantity of the metal expansion joint is fixed; and a hoisting steel wire rope is adopted to bind the furnace nose and the steel structure, connection between the steel structure and a foundation is cut off, and the travelling crane is connected withthe hoisting steel wire rope to integrally hoist the furnace nose, the steel structure and the temporary bracket out of the storage area to finish dismantling the furnace nose. By use of the method,construction efficiency is improved, workload is reduced, potential safety hazards are avoided, the intact furnace nose component is guaranteed, and the accuracy of the secondary installation of the furnace nose is improved.

The invention discloses a segmented transportation method for a hatch coaming. The segmented transportation method comprises the following steps that two gantries are placed on the ground in parallel; hoisting equipment is used for hoisting and placing the hatch coaming section by section on the portal frame; the flat car is moved to the bottoms of the two gantries, and the gantries are shored through a shoring mechanism of the flat car; a supporting device is arranged on each portal frame to support the corresponding hatch coaming subsection; and the hatch coaming is transported to a designated position in a segmented mode through a flat car. When the hatch coaming sections are transported, the supporting device is used for supporting the hatch coaming sections, the supporting effect can be achieved, the supporting device does not need to be welded to the hatch coaming sections, the workload of cutting, grinding and the like during follow-up dismounting of the supporting device is reduced, and the working efficiency is improved. And meanwhile, the structure of the hatch coaming section cannot be damaged during dismantling, and the structural integrity of the hatch coaming section is guaranteed.

The invention discloses an assembly type large-tonnage girder erection hoister and a girder erection method and relates to the technical field of bridge engineering construction equipment. The assembly type large-tonnage girder erection hoister comprises a first preassembled rack A, a second preassembled rack A', an intermediate connecting assembly B, a lifting tool 401 and a hoisting assembly 402, wherein the lifting tool 401 and the hoisting assembly 402 are connected with the first preassembled rack A and the second preassembled rack A'; the first preassembled rack A and the second preassembled rack A' each comprise two girder plates 100, a cross beam 201, a middle cross beam 202 and a rear cross beam 203, and the cross beam 201, the middle cross beam 202 and the rear cross beam 203 areconnected between the two girder plates 100; and the intermediate connecting assembly B is connected between the first preassembled rack A and the second preassembled rack A'. The assembly type large-tonnage girder erection hoister provided by the invention can be modularly assembled or disassembled, is easy to assemble or disassemble, convenient to install and dismantle and capable of shorteningthe construction period.