Classifications

• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
  • E04G11/00—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
  • E04G11/04—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for structures of spherical, spheroid or similar shape, or for cupola structures of circular or polygonal horizontal or vertical section; Inflatable forms
• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
  • E04G1/00—Scaffolds primarily resting on the ground
  • E04G1/36—Scaffolds for particular parts of buildings or buildings of particular shape, e.g. for stairs, cupolas, domes
• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
  • E04G1/00—Scaffolds primarily resting on the ground
  • E04G1/36—Scaffolds for particular parts of buildings or buildings of particular shape, e.g. for stairs, cupolas, domes
  • E04G1/362—Scaffolds for particular parts of buildings or buildings of particular shape, e.g. for stairs, cupolas, domes specially adapted for tanks, silos or similar vessels
• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
  • E04G11/00—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
  • E04G11/36—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for floors, ceilings, or roofs of plane or curved surfaces end formpanels for floor shutterings

Definitions

• the object of the invention is a bearing grid of a formwork for a dome over a reinforced concrete rank, which serves to carry vertical working load from concreting formwork and from the working platfoim.
• the bearing grid according to the present invention , will find its application - among others - in erection of reinforced concrete domes for tanks in sewage treatment plants.
• the finction of basic bearing elements of formwork is performed by conventional free-standing tubular scaffolds .
• Vertical loads from formwork, concrete and working platforms are carried by props whose height differentiates up to 20 m, as in the case of concrete tanks for sewage treatment plants .
• Stability of the whole scaffolding system was ensured by three-dimensional scaffold lattice , made of props , longitudinal and cross bars, and vertical and horizontal bracings . All connections between particular lattice bars are ensured by conventional joints.
• the lattice is formed through a regular circumferential partition in horizontal plane into sectors 7 ,5o wide , with props spaced every 1 ,30 m.
• partition of the inner space of the tank into levels assumes their height as 2 ,0 m in the cylindrical part , 2,25 m in the sub-dome part and 0,75 m in the bottom funnel .
• the purpose of the invention is to remove - or at least to reduce considerably - inconveniences encountered in the course of concreting of a tank dome .
• a task to elaborate a concept of const ruction of a formwork bearing a grid for a dome over a reinforced concrete tank which would enable elimination of labour - consuming scaffolding system in the space from the tank bottom to a level at the heigh of about 10 m.
• the bearing grid of the formwork for a dome over a reinforced concrete tank has bearing elements circumscribed on the network of a number of regular polygons inscribed subsequently one into another and turned subsequently in relation one to another by the same angle , so that respective sides every second polygon in the network are parallel to each other, whereas the whole network has at least two axes of symetry.
• the comers of the biggest polygon are mounted in bearing seats. Bearing elements are arranged in steps and each subsequent element is supported solely on the element placed one step down.
• the bearing grid does not require additional bracings as it is rigid by itself and forms a rigid horizontal structure . Erection and dismantling of the grid is very simple . Short description of the drawing
• Fig. 1 presents the bearing grid of a formwork seen from above
• Fig. 2 presents vertical section of the grid in its axis.
• regular polygons are formed by squares, turned one to another by 45 o.
• Bearing elements 1 , 2, 3, 4, 5, 6 of t he gri d, according to the invention are circumscribed on the network of squares inscribed one into another and turned subsequently by 45o in relation to each other.
• the biggest bearing elements 1 form discountable binding joists 1 with reinforcing elements 8 and 9.
• the bearing elements 2 are formed by four grid beams placed on the binding joists 1 and fixed to them by means of simple dismountable joints. On the erected four bearing elements 2 is placed subsequent storey composed of.
• bearing elements 2 are connected with each other in a disconnectable way in order to facilitate their dismantling and they are turned one to another by 45° .
• the bearing elements 1 are connected in a disconnectable way with one another and their corners are placed in support seats 7 in in-situ cast reinforced concrete walls of the upper part of the cylindrical tank in a sewage treatment plant .
• the seats 7 are cut out in the concrete walls 0 ,9 a thick and they are furnished with support plates 10.
• the working space of the grid which has a stepped structure , is laid out by bottom planes of circular sectors, formed between tank walls and binding joists 1 and top planes of the network of triangles arranged in steps . Those planes are filled with radial beams. The radial beams carry loads from props 11 during concreting .
• the geometrical network of the grid composed of triangles , assures a nigh degree of rigidity and stability of the whole structural system. Shoring and formwork for the dome is placed on working platform, above the bearing grid.
• Another variant of the grid has bearing elements circumscribed on the network of hexagons inscribed one into another and turned subsequently by an angle of 30o . Also in that variant of the grid , vertical and horizontal loads irom the formwork are carried to the cast-in-place reinforced concrete walls of the tank through heel joints and support seats cut out in those walls.

Landscapes

• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Mechanical Engineering (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Sewage (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20055308

Family Applications (1)

Country Status (2)

Cited By (1)

Citations (2)

• 1991
  • 1991-07-24 PL PL91291234A patent/PL167925B1/pl unknown
  • 1991-12-06 WO PCT/PL1991/000015 patent/WO1993002265A1/en not_active Ceased

Patent Citations (2)

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