SU1307030A1 - High-pressure turbine pipeline - Google Patents

Abstract

The invention relates to the field of hydraulic engineering and can be used in the installation of turbine pipelines of hydroelectric power plants. The purpose of the invention is to improve the stress state of the pipeline, increase reliability, reduce material consumption and simplify manufacturing technology. The cylindrical reinforcement cage of the reinforced concrete shell of the pipeline consists of two oppositely wound spirals 2 and 4, the inner and outer, displaced one relative to the other by I / 2 steps with common longitudinal rods 3 placed between the spirals. Placing the reinforcement cage at a distance of 3–5 diameters of reinforcement from the steel shell 1 allows an interlayer of concrete 5 to be put into operation. The compression of the concrete interlayer resulting from the tendency of the spiral to unfold increases the bearing capacity of the concrete for stretching. 3 IL. (From the next page)

Description

The invention relates to the construction of reinforced concrete pressure pipelines with a steel sheath and a two-layer reinforcement cage and can be used in the installation of turbine pipelines of hydroelectric power plants.

The circuit of the invention is to improve the stress state of the pipeline, increase reliability, reduce material consumption and simplify the manufacturing technology,

The design of the proposed high-pressure turbine pipeline is given; FIG. 2 is a section A-A in FIG. Fig. 3 of the pipeline armored structure.

The proposed pressure pipe design consists of a steel shell 1 and a reinforcement cage. made in the form of an internal helix 2, fastened with longitudinal rods of the rear and wound directly into them an external helix 4, and an external helix A of Navit is opposed to a vnukrenny helix 2 with a shift of 1/2 step. The coils of the inner and outer helix (Fig. 1) are arranged in a checkerboard pattern. The steel sheath and the reinforcement cage are covered with concrete 5

The reinforcement cage is made in the form of spirals by bending a continuous reinforcement brace, and during rolling, reinforced steel does not exceed the yield point and the rod after bending and fixing works in an elastic st. increases the stiffness of the reinforcement cage due to the CTpeNmeHHH spirals unfold. If the inner helix: b is rotated clockwise, then the outer helix is against. Thus, the prestressing of the reinforcement cage is created in the cement grid, which leads to compression of the concrete layer and improves its work on stretching. A counter winding with a shift of 1/2 step (Fig. 3) allows the reinforcement cage section to be made symmetrical, more evenly automatically, to distribute the reinforcement over the cross section of the reinforced concrete shell and thereby improve the complex stress state.

five

0

five

in which the pipeline is working.

The distance between the steel shell and the first row of reinforcement is assumed to be not less than 3 and not more than 5 diameters of the reinforcement. The distance between the reinforcement bars in the rows with a two-row structure should correspond to 4-5 diameters of the reinforcement,

From the point of view of n: the destructibility of the turbine water conduit of the steel-concrete structure, the steel-reinforced concrete shell should have a reinforcement cross-section ensuring the normal operation of the structure in case of unexpected destruction of the steel steel shell. With a minimum safety factor K 1,. the thickness of the reinforced concrete shell should be minimal, but allowing the design section of the reinforcement to be placed.

Calculation according to the method of limiting state is made according to the formula

z z

 - F ;; F

where q is the load;

g is the inner radius of the shell;

and

Foi

The cross-sectional area of the steel shell and reinforcement, respectively.

The proposed design possesses equal strength characteristics, since it has the same area of armature (Fp,) j compared to the well-known argrovania scheme, which significantly reduces the consumption of metal and concrete.

Claims (1)

Invention Formula A high-pressure turbine pipeline containing a steel sheath and reinforced concrete shell, the cage of which is made in the form of internal and external spirals and longitudinal rods, in order to improve the stress state of the pipeline, increase reliability, reduce metal consumption, simplify manufacturing technology, internal and the outer spirals are wound in opposite directions and with a 1/2 pitch shift relative to each other and fastened foam on the longitudinal rods placed between them. 2 p Editor K. Volopzuk fuff3 Compiled by S.Lobarev Tekred M. Khodanich Proofreader E. Roshko WITH b s b b with G "b Order 1604/27 Circulation 607 Subscription VNYIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., d, 4/5 Production and printing enterprise, Uzhgorod, st. Project, 4