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1、MSS骨移模架施工工艺及技术控制Proceedings of the fourteenth annual meeting of the society of bridge and structural engineering, Chinese society of Civil EngineeringChinese Institute of civil engineering of bridge and structural engineering institute proceedings of the fourteenth annual conference of the Nanjing Y
2、angtze River Bridge project.Construction technology and technical control of MSS sliding die setNanjing Yangtze River Bridge 50m bridge constructionLiu Jizheng, Qi Lujie, Wang Xiaoshan(Shandong Province Traffic Engineering Corporation, Nanjing Yangtze River Bridge Project Department)Abstract this pa
3、per briefly introduces the structure and composition of MSS slip and its application in construction.Sliding formwork; construction technology; deflection controlI. General Situation of the projectNanjing Yangtze River Bridge North Bridge bridge upper structure for 16m*30mand 5m*50mPCwith variable c
4、ross section continuous beam bridge. The whole bridge section is composed of two single box and single chamber beam sections separated from top to bottom, and a central partition cover plate isarranged in the middle. among 5 * 50m approach bridge in30mapproach bridge and the main bridge transition s
5、ection, the bridge is located in land and water, land a hole, four holes on the water, the peak water level 7m. Therefore, it is very important to choose an optimum construction scheme.Two, scheme comparisonBased on the bridge position of 50m bridge, two schemes should be adopted for the constructio
6、n of superstructure: 1. Support construction, set up a full support with one hole on the river bank, insert four hole copper pipe pile in water, and build a steel pipe pile support. Adopt the construction without scaffold. That is, the introduction of foreign advanced equipment - sliding die frame f
7、or construction.The first construction plan is the traditional construction method of our company. There are abundant construction experience, the technology is easy to control, but this scheme for water construction, heavy workload, Jixietaiban, the economy is not reasonable, the construction sched
8、ule is not ideal. Second kinds of construction schemes, advanced construction equipment, with the leading domestic level, but this kind of equipment is used for the first time our company, the technology is difficult to control, for the construction of water in the middle span cast-in-place continuo
9、us beam bridge is particularly suitable for. Synthetic manifold reasons In consideration of Nanjing bridge project of the company ultimately decided to use no scaffolding construction that the introduction of MSS sliding formwork system.Three, sliding mode profilesThe MSSslide beamintroduced by our
10、companyis mainly composed of six parts, the bracket (Niu Tui), the main beam (GangXiangliang), the crossbeam, the back beam, the external die and the internal die. Each part is equipped with an internal hydraulic or mechanical system. The structure and function of each component are as follows:1. br
11、acketBrackets are commonly called brackets and triangular structures. Through the reserved hole (diameter: 80cm*100cm) insert attached to the pier on the pier. Its role is to support the main girder, the main girder load transfer to the pier on the bracket. A sliding block is arranged on the top fac
12、e of each bracket. It is equipped with two pairs of 20t horizontal automatic moving hydraulic jacks.A 450t vertical automatic hydraulic jack, a longitudinal moving hydraulic jack. The main beam is embedded in the overhead travelling crane. In order to reduce the friction between the main beamand the
13、 crown whenmoving in longitudinal direction, the crane is equipped with a poly four vinyl slide board, and the main beam is positioned in the direction of the slab, the direction of the bridge and the vertical height through thethree hydraulic system.2. main beamThe sliding girder is a pair of steel
14、 box girders. The section size of the steel box girder is wide: 2.0m, height: 3.0m, length 64.8m, divided into six sections - 10.7m + 4*0.8m+10.9m). The joints are connected by friction type high strength bolts. In order to makethe main beamslide along the bridge from the upper hole to the next hole
15、, the front and back of the main beam is equipped with a bridge type nose bridge, long 21m. The main girder is a load bearing component of the sliding mode, weighing about 350t. The main beam is provided with a window, and the crossbeam is provided with a main beam; a vertical hydraulic jack, a mech
16、anical jack and a horizontal jack are arranged in the window. The steel beamis hinged with the main beamthrough the pressure system, and the main beam is subjected to the construction load of the external, internal and upper structure transferred by the crossbeam.3. beamThe whole sliding mode has 18 pairs of cross beams, the beam is H type, the steel structure size is 35cm*90cm*900cm,each pair of beams for pin connection, the beam spacing 3
