Guangzhou Steel construction technique which span a large space?
Guangzhou Steel Slide the laws generally can be divided into two types: structures by supporting sliding method. The following were introduced Guangzhou Steel construction features of the two methods.
Slip Method: The basic idea is to structure the whole (or partial) in the first assembly with the conditions of the site assembly forming, re-use sliding systems designed to shift the overall position of installation method. With this installation technology, assembly site and assembly machinery and equipment can be focused on a relatively fixed venues, as compared with in situ mounting method can reduce the amount of temporary support measures and operating platforms, space-saving processing and management costs. First with the structures by which key consideration in the design of the structure of direct construction difficult position, for example outside the periphery of the construction site is limited, can not meet the normal walking across the inner lifting equipment. The basic elements of this construction method is to "enhance the overall engineering," the assembly ground reaction force support, enhancing the overall replaced by "lateral movement", so essentially the same method to enhance the work.
At the same time, using this method should at least pay attention to several points: a support structure at the slip in favor of laying the track, slip line length, the higher the efficiency; slip unit should geometric invariant system, slip process is sufficiently rigid and stability, resistance to minimize slippage when. When using multi-point traction slip is achieved, in order to avoid twisting structure during sliding, traction synchronization must be controlled if it is difficult to ensure that, should fully assess the impact calculated by the traction unit is not synchronized to slip caused when necessary, temporary reinforcement of the slip unit. Slip unit before the final fixed structure exists in a direction orthogonal to the direction of movement of "easy slip" trend, because the conditions are different and the design of supports, designed to prevent the outside (ie, the slip plane) of the deformation, it is necessary to take prevent the "fall" of measures, such as setting a rigid rod or flexible cable from the balance on both sides of the support nearby.
In addition, the structure of sliding method further comprises two different processes: Pin slip by, the cumulative slip.
Pin slip by: the slip unit or a Pin Pin composed by a number from one end to the design position, between the sliding unit at high altitude were connected directly to form a unitary structure.
Cumulative slip: slip upcoming unit on the rail just slip some (temporarily moved to the design position) to be connected to the next unit and then slip a distance, and so forth, by Pin accumulated until each unit Pin push to the design position.
In general, large-span space steel structure and installation method, can not be set when the temporary support or the use of a crane to install the poor, that is, direct construction of buildings at the position in question, Slip engineering methods can be used as solutions one.
Supporting sliding method: sliding method is supported in the structural design of the Group erection support frame structure in place in order to provide support for installation and operation of the platform, to be part of the structure of the installation is complete, the support that is already installed sliding structure Bi out. Such is the structure of the adjacent in-situ installation created the conditions, and so on, until the completion of the structure of the overall installation. Thus, with different structures by supporting sliding method can be summarized as "structure does not slip and slide support mechanism" and Slip law is "structural support mechanism does not slip and slide." When using the support sliding method, in addition to the support structure is designed to meet the general global and regional stability, but also consider the level of dynamic load (start-up and braking effect caused by the horizontal inertia force), can be added a large brace if necessary to improve its anti lateral stiffness. To sum up, since this method to be occupied structure across the venue, so when the surrounding environment is difficult to provide a splice site structure supporting sliding method can be used as one solution. It is worth noting that, regardless of the support structure or slip slip method, the sliding track in addition to the conventional linear translation, the slip curve is also not uncommon, frequently used in engineering practice.
Enhancing the overall installation method: Installation method to enhance the overall structure is to be installed on the ground floor or a suitable projection assembly forming position, and then use the "lifting system" will enhance the overall upward to an installation method of shaping the design elevation structure. When large-span steel structure height is higher, not conducive to the erection of supporting tire rack, lifting steel shape rules, enhancing the overall construction methods can be employed as an option.
Large-span steel structure cantilevered unsupported installation method: the so-called large-span steel structure cantilevered unsupported installation method that is not in the erection of the support mechanism of the conditions to the stiffness of cantilevered steel body based on the use of mechanical lifting at height parts installation, use and gradually extended phase of the installation way for construction. Relatively high altitude in situ installation method, although the labor law is also in the vicinity of high-altitude Situ installation, but does not entirely because of the temporary support mechanism, measures less construction, the construction process is simple (no unloading). Suitable structural body stiffness, good stability, high height cantilevered steel. With this construction method, by the influence of its own weight, will be cantilevered section under torsion, and the resulting problems is to install the coordinates of an unknown member of the encounter when the mounting position or shape required the presence of the closure case, the bit configuration of the construction process shape control is one of the biggest technical problem, which is directly related to the construction field configuration when completed can meet the requirements, and the cantilevered section smooth closure.
Guangzhou Steel for large-span steel structure construction, the original high-altitude air unit installation method, slip mounting method, enhancing the overall law and large span cantilever mounting method is currently unsupported several typical and common construction methods, but its application must grasp conditions and key technical points, in engineering practice, a reasonable choice. Especially in recent years, most of the projects has a unique architectural style, bring many difficulties to the construction in particular installation. A deep understanding of the structure of the composition of these projects, to understand its load transfer path, familiar with the specific requirements of the project area where the ambient conditions and the engineering, construction and available resources and master their own proprietary technology to local conditions to design the most appropriate , get rid of the installation program, it is the pursuit of the highest level of construction technology.
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