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626results about How to "Shorten the construction period" patented technology

Box type high-voltage heater

The invention relates to heat exchange equipment, in particular to a box type high-voltage heater. The box type high-voltage heater comprises a water inlet chamber, a water inlet pipe plate, a water outlet chamber, a water outlet pipe plate and a plurality of heat exchange pipes, wherein two ends of each heat exchange pipe are connected together with the water inlet pipe plate and the water outlet pipe plate. The high-voltage heater is characterized by further comprising a pair of cylinder-shaped headers having functions of both tube plates and water chambers, the interior space of one header forms the water inlet chamber; the surrounding walls of the header form the water inlet pipe plate; the interior space of the other header forms the water outlet chamber; the surrounding walls of the latter header form the water outlet pipe plate. The high-voltage heater provided by the invention solves the problems that when a current high-voltage heater is applied to a thermal power generating unit above 750 MW, a thick tube plate and a thick sealing head are indispensable parts, the manufacturing is inconvenient, the application risk is high, the quality risk is high, and the current high-voltage heater is not suitable for variable load operation and peak-load regulation operation.
Owner:孔泽学 +1

Intelligent LED lamp controller and control method

The invention relates to an intelligent LED lamp controller and a control method. The intelligent LED lamp controller is provided with a parallel connection/serial connection conversion unit which is connected with a decoding module. When all LED lamps are not subjected to address code writing and normally receive data transmitted by a DMX512 signal generator, the input RS485 bus and the output RS485 bus of the lamps are in parallel connection, namely the lamps are connected in parallel to a public RS485 bus through the input RS485 bus and the output RS485 bus to perform data communication with the DMX512 signal generator; and when an addressing device codes address codes for the lamps, the decoding module controls the parallel connection/serial connection conversion unit to change the parallel connection of the input and output RS485 buses in the lamps into serial connection. The intelligent LED lamp controller has the advantages that: the failure of one lamp cannot influence other lamps, and the assembly sequence and positions of the lamps can be changed freely, the lamps are serially connected during automatic addressing, and the lamps of the whole system are communicated in parallel through the buses once the address is coded.
Owner:杭州罗莱迪思科技股份有限公司

Sling tensioning and system conversion method for double-tower three-span plane main cable self-anchorage type suspension bridge

The invention discloses a sling tensioning and system conversion method for a double-tower three-span plane main cable self-anchorage type suspension bridge. The sling tensioning and system conversion method comprises a first step of synchronously tensioning and anchoring a plurality of slings horizontal at an identical vertical bridge direction position; a second step of enabling sling tensioning within a full bridge to be performed at four operation positions simultaneously at most, enabling two side spans to be two operation positions respectively, and enabling two half spans of a main span to be two operation positions respectively; a third step of symmetrically tensioning slings of two half-bridges with a main span midspan serving as a limit; a fourth step of tensioning and anchoring side span slings from a side span midspan to two sides one by one within the range of each half-bridge, synchronously tensioning every two adjacent slings in remaining slings which are not tensioned or anchored from a main tower to the midspan, tensioning and anchoring slings close to the main tower, enabling another sling to be tensioned to some cable force and be temporarily anchored, and circulating until all slings are tensioned and anchored. According to the sling tensioning and system conversion method, a construction speed is quick, a construction period is greatly shortened, needed jacks and extension bars are fewer, and the cost is greatly reduced.
Owner:CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY

Novel sleeve-type fabricated joint of square steel tube column and H-shaped steel girder and construction method of novel sleeve-type fabricated joint

The invention provides a novel sleeve-type fabricated joint of a square steel tube column and an H-shaped steel girder and a construction method of the novel sleeve-type fabricated joint. The novel sleeve-type fabricated joint comprises a joint area square steel tube column section, a joint area H-shaped steel girder section and a connecting piece. The connecting piece comprises a square sleeve, an H-shaped sleeve and a supporting steel plate, the square sleeve and the square steel tube column are connected through high-strength bolts, the situation that the column wall is too thin, and thus local protrusion occurs to the positions, where the bolts are located, of the square steel tube column is effectively prevented, and thus the bearing force of bolted connecting positions of the columnand the girder is increased; the H-shaped sleeve and the square sleeve are connected in a welded mode, the welding area is increased compared with a conventional mode, and thus the joint is firmer andsafer; the supporting steel plate is connected with the square sleeve, the joint area H-shaped steel girder section and the joint area square steel tube column section simultaneously through high-strength bolts, the bearing force of the girder and column joint is increased, thus stress is more reasonable, and the joint is firmer; and the welding section can be completed in a factory, on-site zero-welding is achieved, and thus the novel sleeve-type fabricated joint is suitable for fabricated connecting of the square steel tube column structure and the H-shaped steel girder structure.
Owner:JIANGSU UNIV

Comprehensive inspecting and testing method for high voltage power transformer and distribution substation

The invention provides a comprehensive inspecting and testing method for a high voltage power transformer and distribution substation; through using the boosting principle of a transformer, a 380V construction power supply is applied to the low-voltage side of secondary winding of the transformer by a designed power transmission control protection device, and thereby stimulated high voltage electricity is obtained at the high voltage side of the transformer. The stimulated high voltage electricity is transmitted from a transformer feeder cabinet to a transformer substation bus system for stimulating power transmission. After the high voltage bus system is simulatively electrified, the stimulated high voltage electricity is further transmitted a voltage transformer PT cabinet to perform stimulated power transmission, for inspecting operational parameters of the PT cabinet and inspecting whether voltage values of an open winding, a triangular winding and high voltage cabinet microcomputer intelligent protectors meet requirements. The simulated voltage is transmitted to the voltage transformer PT across two sections of buses for simulating power transmission, thus being capable of inspecting protection functions of the PT microcomputer intelligent comprehensive protection device, and performing PT automatic switching tests. Through simulating inverse power transmission, changing the gear switch of the transformer, and recording current values in loops of low voltage side and reading of voltmeter of the high voltage side of the transformer, no-load current characteristic curves of the transformer at different gears can be drawn up.
Owner:CHINA METALLURGICAL CONSTR ENG GRP

Sequence construction method for large area reinforced concrete floors

The invention discloses a sequence construction method for large area reinforced concrete floors. According to construction, areas with length and width which are both less than 50m are numbered one by one along any direction, plate steel bars can be sequentially bound one after another based on a construction arrangement, a concrete casting is performed in a sequence mode, an ordinary construction joint processing method is utilized between a 9m laminate block and a 15m laminate block, each side of each plate construction joint is provided with a 'rapid and easy setback grid' the plate steel bars are constructed according to a normal plate steel bar binding method, a disconnecting process is absent, a concrete pouring utilizes a construction method of 'one inclined plane, a continuous pouring, one-time reaching top', a concrete inclined plane slope is 1:6, before an initial setting of the concrete, the surface of the concrete is subjected to a rolling by an iron roller, and the concrete is flatly rubbed at least three times by a wood float after the concrete is hardened. The method has the advantages that the cracking effect can be effectively controlled, the construction is convenient, the construction period is shortened, the cost is reduced, and the quality is reliable.
Owner:CHINA RAILWAY HI TECH IND CORP LTD +1

Plugging structure for large-drawdown pipe well and construction method thereof

The invention relates to a plugging structure for a large-drawdown pipe well and a construction method thereof, and belongs to the field of building construction. The plugging structure for the large-drawdown pipe well comprises a no-sand cement pipe and a steel casing pipe. A steel plate water stop ring is welded to the steel casing pipe. The portion, located on the bottom elevation portion of an under layer, of the steel casing pipe is connected with a slip-preventing water stop ring in a welded mode. A water stop steel plate with a screw thread steel pipe and the steel casing pipe are welded for stopping water. An end cap with screw threads and threads of the water stop steel plate with the screw thread steel pipe are connected and sealed in a threaded mode. A thickened water stop plugging steel plate is welded to the top of the steel casing pipe. Expansive imperious concrete is poured in the portion between the water stop steel plate and the plugging steel plate of the steel casing pipe. Expansive water stop strips winding around the steel casing pipe are arranged on the connecting portion of the no-sand cement pipe and the steel casing pipe. The invention further discloses a construction method of the plugging structure for the large-drawdown pipe well. Operation is easy to carry out, and the construction period is shortened; as measures of adopting a plurality of waterproof structures are taken, the waterproof effect of a concrete bottom plate can be ensured, and more economic benefits and social benefits can be achieved.
Owner:CHINA CONSTR SECOND ENG BUREAU LTD

Unbalanced foundation pit support design method

A unbalanced foundation pit support design method comprises the steps of determining parameters of a foundation pit design model; determining a displacement mode of a support structure; determining the position of an inner brace (3); determining the parameters of a support structure at one deeper side of a foundation pit according to a traditional single fulcrum pile static balance method; determining the parameters of a support structure at one shallower side of the foundation pit according to a soil pressure computation method opposite to the traditional mode; supporting at a bounding surface between the deep foundation pit and the shallow foundation pit by adopting a traditional cantilever support structure; determining a support structure material and reinforcing bars according to a maximal bending moment and a maximal shear force of each support structure; finally performing whole stability checking calculation, antidumping checking calculation, and anti-heaving stability checking calculation. By adopting the unbalanced foundation pit support design method, the characteristic of unbalanced pressures at two sides of the unbalanced foundation pit is fully used, the pressure resistant property of a soil body is played, materials are saved and construction period is shortened under the premise of ensuring safety, and the method has very high promotion and application values.
Owner:EAST CHINA JIAOTONG UNIVERSITY

Rock-fill concrete (RFC) and cemented sand and gravel (CSG) composite material dam as well as design and construction method thereof

The invention belongs to a rock-fill concrete (RFC) and cemented sand and gravel (CSG) composite material dam in the technical field of gravity dams as well as a design and construction method thereof. A dam body of the composite material dam comprises an RFC part and a CSG part; and the dam body at the upstream side of the composite material dam is the RFC part, and the dam body at the downstream side is the CSG part. The RFC part is poured by adopting an RFC material. The CSG part is poured by adopting a CSG material. The advantages of the two materials of the RFC and the CSG can be simultaneously exerted; because the upstream side of the dam body is poured by adopting the RFC, the procedure of distributing seepage preventing planes on the upstream surface can be omitted, thereby simplifying construction, shortening the construction period, and reducing the engineering amount of the dam body; and the sand and gravel of a riverbed and excavating waste slag can be used for preparing the materials of the RFC and the CSG, therefore, the invention can more fully utilizes excavating materials, reduce the construction cost and greatly reduce negative impact on environment and has favorable social, economic and environmental ecological benefits.
Owner:TSINGHUA UNIV

Integrated excavation construction method for transition from shaft construction passage to large cross-section tunnel

The invention discloses an integrated excavation construction method for transition from a shaft construction passage to a large cross-section tunnel. The method is characterized in that mileages of ashaft, a cross passage and an internal cross passage of a double-sidewall cross passage need to be larger than 3 times of a cross passage hole width, so that mutual interference between shaft and cross passage construction and internal cross passage construction can be avoided; transition construction for the cross passage and a subway station tunnel is carried out at a same elevation, so that abias pressure on a joint section caused by variable cross-section construction for the large cross-section tunnel and a small cross-section tunnel can be avoided; and the internal cross passage is established and a frame girder is erected during excavation of the large cross-section tunnel through the double-sidewall drift method, so that the transition construction is achieved. The method provided by the invention has the advantages that the benching tunneling method for the construction passage and the 9-step double-sidewall drift method for the subway station tunnel are integrated, so thata transition section process of the two construction methods is simplified, and the construction is facilitated.
Owner:BEIJING MUNICIPAL ROAD & BRIDGE
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