A kind of gravity type foundation structure of many pedestals
Technical field
The present invention relates to the gravity type foundation structure on a kind of basis of high-rise structure, particularly a kind of many pedestals.
Background technology
For natural soft soil foundation, the bearing capacity of ground often is difficult to satisfy the requirement of works, usually needs to build special structural element.
The foundation structure pattern of ocean engineering mainly comprises: single-pile foundation, gravity type foundation, suction type foundation, many pile foundations and floatation type basis.The present domestic single gravity type foundation structure that generally adopts, because himself huge weight can keep the stable of works, simple in structure, good stability is widely used in the ocean engineerings such as harbour, harbour.As shown in Figure 1, because single gravity type foundation weight is huge, the bearing capacity of sea bed is difficult to meet the demands, and need to carry out jackstone and process the supporting capacity that improves ground.When the depth of water is larger, the construction operations such as dredging operation, excavating foundation trench, fill block stone throwing and compaction in layers of sea bed all are difficult to carry out, huge monomer basis weight also makes the transportation mounting cost significantly increase.The foundation structure of land wind power generating set also mainly adopts gravity type foundation.For soft foundation, need to adopt various measures and carry out the weak soil punishment, working procedure is complicated, and cost is higher, and the single gravity type foundation scale of construction is huge.
Summary of the invention
Technical problem to be solved by this invention is, for the prior art deficiency, a kind of gravity type foundation structure of many pedestals is provided, improve gravity type foundation to adaptive capacity and the stability of ground, make gravity type foundation can resist larger extraneous moment of torsion, strengthen the resistance to capsizing of gravity type foundation.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of gravity type foundation structure of many pedestals, comprise main gravity base, also comprise a plurality of secondary gravity bases, described secondary gravity base is connected to form a polygon by horizontal shore, described main gravity base is positioned at polygon, and main gravity base is connected by horizontal support bar with each secondary gravity base, is fixed with oblique bracing frame on the described secondary gravity base.
As preferred version, described secondary gravity base quantity is three, and three secondary gravity bases connect in twos by three horizontal shores, form an equilateral triangle, and described main gravity base is positioned at the equilateral triangle center.
As preferred version, the polygon of symmetry centered by the described polygon, described main gravity base is positioned at the polygon symmetrical centre.
One end of described horizontal support bar is connected with the center of secondary gravity base, and the other end is connected with the center of main gravity base.
As preferred version, described oblique bracing frame and horizontal plane angulation are 30
0~60
0
Secondary gravity base weight generally is not less than 20% of main gravity base weight.
Compared with prior art, the beneficial effect that the present invention has is: the present invention is split as a plurality of gravity pedestals with the gravity pedestal that gravity type foundation was single in the past, increase the contact area of basis and ground, reduce the active force of basis to ground, improved adaptive capacity and the stability of gravity type foundation to ground; When using the gravity type foundation structure of many pedestals of the present invention, can dispose according to engineering geological conditions the secondary gravity base of varying number, adjust the length of horizontal support and oblique support, change the distance of secondary gravity base and main gravity base, make gravity type foundation can resist larger extraneous moment of torsion, strengthened basic resistance to capsizing; The present invention can be used as the basis of offshore wind turbine and the tower-type works such as tidal power generating unit, land wind power generating set.
Description of drawings
Fig. 1 is existing gravity type foundation structural representation;
Fig. 2 is one embodiment of the invention lateral view;
Fig. 3 is one embodiment of the invention top view.
The specific embodiment
As shown in Figures 2 and 3, one embodiment of the invention comprises main gravity base 1, also comprise three secondary gravity bases 2, three secondary gravity bases 2 are connected to form an equilateral triangle in twos by three horizontal shores 3, main gravity base 1 is positioned at the equilateral triangle center, main gravity base 1 is connected by a horizontal support bar 7 with three secondary gravity base 2 amongs, an end of described horizontal support bar 7 and being connected of secondary gravity base, and the other end is connected with main gravity base; Respectively be provided with an oblique bracing frame 4 on three secondary gravity bases 2, oblique bracing frame 4 is 45 with the horizontal plane angulation
0, the tower cylinder 6 of works is fixed on the main gravity base 1 by flange or socket joint member 5, and secondary gravity base 2 is connected by flange or socket joint member 5 with oblique bracing frame 4 one ends, and oblique bracing frame 3 other ends are connected with tower cylinder 6 by flange or socket joint member 5.
Secondary gravity base weight generally is not less than 20% of main gravity base weight.
Main gravity base, secondary gravity base, oblique bracing frame and horizontal shore can be the member that steel work, reinforced concrete structure or other materials are made.
The marine installation and transportation process of the gravity type foundation structure of many pedestals is: on land processing and fabricating master gravity base, secondary gravity base, horizontal shore, oblique bracing frame and the combiners such as flange or socket joint member; Harbour is assembled into integral body with it in special-purpose coastal waters; Hang the transportation by driving air bag in each secondary gravity base side, make the gross buoyancy of transportation by driving air bag greater than the total force of gravity type foundation; With tugboat with the gravity type foundation integrally dragging to the infield, with location barge or anchorage hawser location, the burst size of regulating gas in the transportation by driving air bag, the buoyancy size of control transportation by driving air bag, make gross buoyancy be slightly less than total force, thereby guarantee steady, the evenly decline in basis.