RU1820131C - Ballasting method for piping with arbitrary outline of axis routed in swamp on horizontal plane - Google Patents

Abstract

SUMMARY OF THE INVENTION: A curved pipeline is laid in an open trench with installation of heaters on it with a variable increment in the direction of straight sections of the pipeline in increments. The step is increased from the cross section of the pipeline with max, the calculated value of the horizontal transverse movement to the cross section, in which these movements are equal to zero. The number of solvents in these areas is determined from a predetermined ratio. 1 ill.

Description

FIELD OF THE INVENTION This invention relates to construction and relates to the laying of trunk pipelines in swamps.

Improving the reliability of the pipeline by eliminating its movements to the soil surface is achieved by the fact that in the method of ballasting the pipeline with an arbitrary outline of the axis in the horizontal plane in the swamp, which consists in tearing off the trench, laying a curved pipeline into it and installing holders with a variable growing to the side of straight sections of the pipeline in steps, an increase in the step of the gutters is carried out from the cross section of the pipeline with its maximum estimated horizontal cross eremescheni to section, wherein the movement is zero, the number ut zheliteley at these sites is determined by the relationship:

n (9b + Ru / 9grue

gk is the calculated buoyancy force of water acting on the lined pipeline, kN / m; Pv is the calculated buoyancy force of soil resistance acting on the pipeline during its transverse horizontal movements kN / m;

DFUZ - estimated linear load in water from ut. kN / m

The drawing shows a detailed fragment of the diagram of horizontal movements in the pipe section from t.1. up to t. 19.

Example. A section of the underground gas pipeline in the form of a trapezoidal compensator with rotation angles in the horizontal plane passes through a deep swamp and is ballasted by reinforced concrete by loaders of the UBO-1 type. Groundwater level in the swamp

ё

00

u o

with

coincides with its surface. The initial data for the calculation are as follows: 42 m, g -118.5 N / cm, d 8N / cm, n 1.20, kN / m2, Er 125 kN / m2 (K. 1.53, A 197.

The maximum possible value of the transverse horizontal displacements of the pipe, U cm, is obtained from a computer calculating the stress-strain state of the gas pipeline at a gas pressure of 75 atm and a temperature difference of 58 ° 0 and is shown in the figure. As follows from the calculation, there are two sections with maximum lateral displacements in opposite directions from the pipe axis: the first is centered at point 8 (cm), the value of displacements decreases to zero at point 11 and outside point 1 to the left from the right point 8. centered at point 19 (cm), for which the displacements are zero at point 11 and on the other half of the compensator outside the axis of symmetry. In both of these areas, ballasting should be performed with a variable pitch, increasing from points 8 and 19 to the left and right of them to the sections where. The value P - the calculated resistance of the base to the lateral movement of the pipe horizontally is calculated from the equation: ... .

2sh

, 84 Rlr) / Pz + (0.4

0.31-Er-i-Rpr2 / 0-.K4 -tf ..

where RPr is the ultimate resistance of the base to the transverse movement of the pipe horizontally,;

Er is the horizontal horizontal deformation of the base of the pipeline.

U is the estimated value of the maximum horizontal movement of the pipe,

D is the outer diameter of the pipeline,

K are dimensionless parameters depending on the relative A depth of the pipeline.

The resulting P value is substituted into the formula.

25 P - (3.21 -A) -d. .

at point 19 Pv 119.3 N / cm. Next, the required number of cargoes is determined. (Per 1 popm of length) in individual sections of the gas pipeline:

The first section: at point 1: n (118.4 + 40.7) / 202,, 78 pcs., At point 8: n (118.4 + 107.9) / 202,, 12 pcs. (This means that in this section for 78 lengths of the gas pipeline, 78 and .112 weights must be installed). From

from point 8 to point 1, the installation step of the gutters increases from 1.12 to 0.78 pcs / m, t t and the number of gutters in section 1-8 is (0.78 + 1.12) / 2 0.95 pcs ./help. At point 11: n (118.4 + 0) / 202,, 58.

Consequently, from point 8 to point 1, the installation step of the gutters increases from 1.12 to 0.58 pcs / linear and the number of iron girders in the 8-1V section is (1.12 + 0.58), 85 pcs. / pog.g1 .;

Second section:

at point 19: n (118.4-I 19.3) / 202,, 17

PC. . ..:.; ..:: - - at point 11: p 0.58 pcs. Therefore, from point 11 to point 19, the installation step of the gutters decreases from 0.58 to 1.17 pcs./ linear meters, and the number of gutters in section 11-19 is (0.58 + 1.17), 88 pcs / pog, and,

Claims (1)

The claims The method of ballasting a pipeline with an arbitrary outline of the axis in a horizontal plane on a swamp, which consists in extracting a trench, laying a curved pipeline into it and installing it with variable heaters, pushing it in the direction of the straight sections of the pipeline in steps, about t l and h and y u and s the fact that the increase in uiara y of people is carried out from the cross section of the pipeline with its maximum estimated value of horizontal transverse movement to the cross section in which these movements are equal zero, while the number of users in these areas is determined from the ratio n (gb + Pv) / grpy3, and calculate the necessary buoyancy — 50 where the calculated buoyancy force is the waxing force of the soil repellent P. The calculation gives: at point 1 Pg 40.7 N / cm, at point 5 Pv 74.3 N / cm, at point 8 Pv 107.9 N / cm, at point 11 Pv O, at point 14 Pv 107.9 N / cm dy acting on the lined piping pipelines / m; ... PV is the calculated buoyancy force of soil repulsion acting on the pipeline during its transverse horizontal movements, kN / m ;; load - calculated linear load in water from customers, kN / m. 23.