Kā daudzi kopīgi savienojums metodes do you know about the column feet of multi-span greenhouses?
kolonna pēdas savienojums mezgls of the multi-span greenhouse is one of the main nodes. There are many connection methods for the common column foot connection nodes, who are determined by the design unit based on factors such as the type, size, different loads, and customary practices of the construction unit.
1. Klasifikācija of kolonna pēdas savienojums metodes multi-span siltumnīcas
According to the force calculation, the column foot connection method of multi-span greenhouse is divided into two types, namely rigid connection (consolidation) and hinge connection. The difference between the two is: the rigid joint can bear not only the axial pressure and horizontal shear force, but also the bending moment, the hinged joint can only bear the axial pressure and horizontal shear force, and the column can rotate freely, but cannot bear the bending moment. For multi-span greenhouses with the same part above the foundation, the foundation of the rigidly connected column foot is larger than the hinged column foot. The semi-rigid connection is between the two, and it is not reflected in the design specifications, that is, the theoretical basis for semi-rigid connection in construction is not very mature, and the industry has not yet reached a consensus.
2. Kopīgais savienojums metodes of multi-span siltumnīca kolonna pēdas
The construction method is that there are pre-embedded bolts (flat steel) on the top of the foundation, and there are installation holes on the bottom plate of the column (the root of the column), which can be directly tightened on site, which is the most commonly used connection method at present. According to the number of embedded bolts, there are the following categories:
(1) 1 pre-embedded bolt (some use pre-embedded flat steel)
(2) 2 embedded bolts (some use 2 steel expansion bolts)
(3) 4 buried bolts (equivalent to semi-rigid connection)
(4) 4 buried bolts and pre-embedded steel plates in one
②On-site welding of column and embedded steel plate
The construction method is that there are pre-embedded steel plates on the top of the foundation, no pre-embedded bolts, the elevation of the upper surface of the pre-embedded steel plates is the elevation of the bottom of the column, pouring is in place at one time, and the bottom plate of the column and the pre-embedded steel plates are welded on site.
③Pre-embedded steel pipe
It is generally used in multi-span plastic film greenhouses, and has low requirements for the accuracy of foundation construction.
The construction method is: the pre-embedded steel pipe is constructed at the same time as the foundation, the pre-embedded steel pipe is slightly larger than the diameter of the column, or is the same as the diameter of the column, the pre-embedded steel pipe is reduced in diameter, and bolt holes are left at the root of the column and the pre-embedded steel pipe. Bolt on.
This connection method is rigid connection, and the construction method is to construct the column and the foundation at the same time, and then install the gutter and other components after curing to a certain strength. This kind of connection method is not widely used, and it is mostly used in multi-span plastic film greenhouses, which has low requirements for the accuracy of foundation construction.
