Above ground pipeline over subject to creep slope

FIELD: construction.

SUBSTANCE: pipeline has triply connected supports mounted on the stable sections above and under the slope subject to creep, one connected supports arranged over the subject to creep slope, and deformation compensator. The distance between the upper support and site of the deformation compensator arranged below the slope subject to creep is determined from the formula proposed.

EFFECT: enhanced reliability of the pipeline.

2 dwg

 

The invention relates to the field of pipeline transport and can be used in pipeline construction on slopes prone to landslides.

A known method of laying pipeline in the longitudinal landslide (see PP Borodavkin. Underground pipelines. - M.: Nedra, 1982, p.101-108), which consists in digging trenches, laying of pipeline and the subsequent backfilling of the trench.

However, the known method has significant drawbacks such as high cost of the pipeline, due to the large volume of earthworks and the need to use tubes of large cross-section for the perception of effort from moving during the landslide soil, the likelihood of increased movements which are due to the following reasons:

1) the trench disrupted the integrity of the soil mass, constituting the landslide slope, which even during construction can cause shifts of the ground;

2) the backfilling of the trench is more loose than in neighbouring areas, resulting in it is more intensive accumulation of moisture, and thus reduced the overall stability of the soil and, consequently, increases the probability of landslides that creates, among other things, problems with the environment due to provoking the activation of landslides.

The known is the aboveground pipeline, used when crossing obstacles or covering large spans (see I.P. Petrov, V. Spiridonov. Aboveground piping. - M.: Nedra, 1964, pp. 353-386, containing trasvase supports are installed on the edges of the obstacles and secured thereto a pipe on the principle of "dangling string".

However, the known pipeline has these significant shortcomings, such as high cost, due to the following reasons:

1) the need for the highest support (availability of deep obstacles), to which is attached a suspended pipe, to ensure the shooter sagging in which tensile forces in the pipeline will be the lowest;

2) when the overlap is large spans of support work heavily loaded, and to prevent the loss of carrying capacity they have to move considerable distances from the edges of the obstacles, which estimated the spans of the hanging thread even more increase;

3) in addition, this type of piping inherent lack of reliability when developing landslide, as the top of the slope of the bearing over time may be at the source of the landslide, and with the loss of its stability will be destruction of this entire site.

Known aboveground pipeline laid along the landslide slope adopted for the prototype (see the patent of Russia №203749 from 12.05.95), containing installed on stable areas above and below the landslide part of the slope trasvase support installed on the landslide slope single and doubly connected supports, laid them on the pipe and located on the sustainable land below the landslide slope compensator for the perception of temperature deformations. With single saddle-type supports are made and installed in characteristic locations of landslide slope: landslide margin of the stream and the expected buckling, as well as at points of probable contact of the pipe with the landslide area on the slope, and stiffness characteristics of the pipe, laid on the landslide area, are accepted for any of the moments of the estimated service life of the pipeline, depending on the maximum distance L between two adjacent saddle-type supports for any of the parts of the landslide slope, which is defined by the following ratio:

where li- the length of the sliding surfaces of the i-th vertical element that broken ground mass of landslide area;

αithe angle of this i-ro element to the horizon;

KiTo2- correction coefficients depending on the steepness of the slope and types of landslides are possible in this area in the current time period; 0.8≤ Ki2; 0,8ࣘ To22;

q - uniformly distributed over the length of the pipe load;

E - the modulus of elasticity of pipe material;

I is the moment of inertia of the pipe cross section;

fi- arrow sagging pipes on landslide area;

Hj- thrust force in the pipe sagging on the plot.

However, the known pipeline has such a drawback, as the low reliability of the pipeline associated with the vulnerability by a landslide compensator placed at the bottom of the landslide slope.

The objective of the invention is to eliminate the above drawback, namely improving the reliability of the pipeline.

This problem is solved due to the fact that the aboveground pipeline laid along the landslide slope, contains installed on stable areas above and below the landslide part of the slope trasvase bearings and installed on the landslide slope single bearing and expansion joint deformities, and the distance from the top support to the place of installation of the expansion joint deformations, located at elevation below the landslide slope, is determined by the ratio:

where L is the distance from the top support to the place of installation of the expansion joint below the landslide area on the terrain;

L1 - the distance between the upper support and the source of the landslide, which is determined from the condition of maintenance of the pipeline;

L02- the distance between the end part of the landslide and the lower compensating device, which is determined from the condition of maintenance of the pipeline;

- the length of the sliding surfaces of the i-th vertical element, which when

the calculation randomly broken vertical section of a soil landslide array up to V;

αithe angle of this i-th element to the horizon;

K - correction factor, taking into account the structural features of the pipeline;

To1- correction factor taking into account the random nature of landslide processes that depend on the geometrical parameters of the landslide;

Kt- correction factor, depending on the design of the pipeline with a lifetime of T and landslide array up to V, likely at the site with the frequency λvfor the life of the pipeline 20≤ T≤ 60 years;

Tov- coefficient taking into account the effect of loosening the soil in the landslide body Tov[0.8-0.99];

λv- the frequency of occurrence probability of 0.05 of the active phase of the landslide volume V within the scope of landslide array;

[Ct] - the minimum value is their correlation coefficient [K t]=0.8;

k∈ [1-40] - the number of landslides volume V, likely for life T supply more than 0.05.

Figure 1 shows a General view of an aboveground pipeline laid along the landslide slope; figure 2 shows a General view of an aboveground pipeline after the landslide, which occurred on one of the sections of the slope with a combined partitioning scheme landslide array of slope at the elementary sites.

Aboveground piping includes pipe 1, is fixed on trechcwetnym supports 2 installed on stable areas of the slope, with the angle β to the horizon. Single bearing 3 is installed on the slope. The compensator 4 is mounted at the bottom of the slope on neobosnovanno site on doubly connected supports 5.

Aboveground piping along the landslide slope is laid as follows. Planned area of landslide slope on which it is supposed to descend pipeline. Is appropriate geotechnical and topographic survey of the slope. Performed calculation part which define the most likely, with angles α to the horizon sliding surfaces of landslides, are calculated by methods known to the author correction coefficients K, K1, Ktare assigned to the parameters of the tube 1 and the compensator 4, the design of the supports 3 is the distance between them. Calculations are made on the conditions for operation of the pipeline within the estimated time. From above at a distance of L01from the slope and bottom of popolznavenia areas of landslide slope are trasvase support 2, and the landslide area - single bearing 3. At the same time they are performed with shallow foundations, to the smallest way to change the structure of the slope and not to provoke the activation of landslide processes. Is laying the pipe 1 on the single support 3 with its fixation on trechcwetnym 2 and 5 doubly connected supports. At the bottom of sustainable land slope is the compensating device 4. Figure 2 shows the L01, L02andand L02measured to the element that determines the efficiency, the expansion joint.

Landslide slope has several sliding surfaces. When calculating selects the most probable slip surface, and the body of the landslide is divided into i sections, with their angles of inclination of the sliding surfaces αito the horizon.

When assigned to the stiffness and strength characteristics of the pipeline are determined by known methods, the parameters of the compensator and its location in accordance with the dependencies listed in the claims. For this purpose, given an initial p is the position of the compensator, check the risk of damage by a landslide and if it is more than the permissible value, move the compensator further from the landslide until such time as the condition of reliability will not be satisfied.

The pipeline in this area is as follows. Support 3 having a slightly foundations, possess stability sufficient to landslide movements to perform its function. During the development of the landslide pipeline receives in addition to temperature deformations and landslide, which perceives the compensator, located in the lower part of the landslide slope. Stiffness parameters of the pipeline are sufficient to ensure that when asked the parameters of the compensator serviceability at failure of the estimated number of single poles. When the spreading of the landslide body in the lower part of the slope compensator, there are, they will not be damaged because it is outside the reach of the landslide and preserves the ability to perceive landslide deformation of the pipeline.

Thus, in comparison with the known, the proposed pipeline has a high reliability in operation.

Aboveground pipeline laid along the landslide slope containing installed on stable areas above and below the landslide part of the slope trasvase TNA is s and installed on the landslide slope single bearing, as well as the expansion joint deformations, characterized in that the distance from the top support to the place of installation of the expansion joint deformations, located at elevation below the landslide slope, is determined by the ratio

where L is the distance from the top support to the place of installation of the expansion joint below the landslide area on the terrain;

L01- the distance between the upper support and the source of the landslide, which is determined from the condition of maintenance of the pipeline;

L02- the distance between the end part of the landslide and the lower compensating device, which is determined from the condition of maintenance of the pipeline;

- the length of the sliding surfaces of the i-th vertical element, on which the calculation is randomly broken vertical section of a soil landslide array up to V;

αithe angle of this i-th element to the horizon;

K - correction factor, taking into account the structural features of the pipeline;

Tol- correction factor taking into account the random nature of landslide processes that depend on the geometrical parameters of the landslide;

Kt- amendments the full-time ratio, depending on the design of the pipeline with a lifetime of T and landslide array up to V, likely at the site with the frequency λVfor the life of the pipeline 20≤ T≤ 60 years;

Tov- coefficient taking into account the effect of loosening the soil in the landslide body

Kv[0,8÷ 0,99];

λv- the frequency of occurrence probability of 0.05 of the active phase of the landslide volume V within the scope of landslide array;

[Kt] - the minimum value of the correction coefficient [Kt]=0.8;

k∈ [1÷ 40] - number of landslides volume V, likely for life T supply more than 0.05.



 

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