Method of laying pipeline

 

The invention relates to the construction and use at ground pipeline. Stack insulated pipes on the layer preparation, sprinkle the pipeline soil layer and form a layer of dirt fill. Segments of the training package and the embankment treated with an organic binder in an amount of from 4 to 15% by weight of the soil layers. Improves the reliability of the pipeline. 1 C.p. f-crystals, 4 tab., 1 Il.

The invention relates to the construction of pipelines.

A known method of laying underground pipeline, comprising the laying of steel piping with isolation trench layer preparation, with filling it with mineral soil excavated from the trench (Babin, L. A., Grigorenko, P. N., Yarygin E. N. Model calculations for the construction of pipelines: Textbook. manual. for universities. - M.: Nedra, 1995. - 246 S.).

The disadvantages of the known method of laying underground pipelines are the most corrosion hazard to structures, because the service life of the insulation is significantly shorter than the lifetime of the pipeline (normative service life of the pipeline is 33 years and the service life of isolation about 10-15 years), the risk of buckling of the pipeline due to waterlogging g is a lot of pipeline, including stacking of steel insulated pipeline in a trench in the layer of preparation, filling it with a layer of sprinkled with subsequent backfilling with soil and the registration roller, the layer of training and sprinkled treated with a solution of the residue thermal cracking of oil 50-80% and light gas oil 20-50% in the amount of 6-8% by weight of soil preparation and sprinkled (ed. mon. THE USSR 932087, F 16 L 57/00. Bull. 20 from 30.05.1982 year).

The disadvantage of the prototype is that this way the strip is not applied in the presence of underlying rock and at intersections with saline soils and swamps. Also the disadvantage of the prototype is that the binder in the amount of 6-8%, which processed layers of training and mixtures, and does not provide improvement of operating conditions of the pipeline from the point of view of protecting the insulation from mechanical damage, adverse environmental effects, corrosion protection of the pipeline and ensure its longitudinal stability.

The present invention solves the technical problem of increasing the reliability of operation and improvement of working conditions pipeline by protecting it from corrosion, protect the insulation from mechanical damage, increase the service life of the insulation.

Specified layer preparation, processed organic binder, filling it with a layer of sprinkled, treated with an organic binder, followed by backfilling with soil and the formation of dikes, use the layer preparation containing an organic binder in an amount of 4-15% by weight of the soil layer sprinkled with organic binder in an amount of 4-15% by weight of soil. Moreover, as the organic binder used TDC (astringent pipelines) TU 38.101960-83, oil and other organic astringent products with or without additives. In addition, to ensure longitudinal stability the formation of dikes carry out a soil containing 4-15% organic binder.

The drawing shows the onshore pipeline was constructed by the proposed method.

Onshore pipeline consists of steel pipes 1, welded into a continuous thread, isolation 2, the layer of preparation 3, layer sprinkled 4, embankments 5. Layer sprinkled with conserve organic binder used for working the soil, made in the form of a trapezoid.

The method of installation of the onshore pipeline is as follows.

Steel pipe 1, zaizolirovali, for example, polymeric insulating tape 2, are placed on a layer of preparation 3, will precede the of autosites (ed. mon. The USSR 1142601), equipped with a watering device.

Soil organic binder in an amount of 4-15% covers the entire possible range of applications. When the ratio of organic binder to the weight of the soil less than 4% are not provided with water resistance, hydrophobicity (low water-stability and strength properties of the soil (compressive strength and cohesion) and not provided for corrosion protection of the pipeline in case of violation of the integrity of insulation at the bottom of the pipeline, for example, due to the depressurization of the seams between adjacent coils of isolation during longitudinal movement of the structure. The increase in the number of binding more than 15% does not lead to a significant improvement of the corrosion resistance properties of the layer preparation and physico-mechanical properties, water resistance and adhesion are reduced, therefore, its further increase is economically unjustified. The content of organic binder in an amount of 4-15% provides a significant improvement in the electrochemical properties of the soil - its transition from high and medium corrosion activity in low corrosivity, provides sufficient active layer preparation for protection of the pipeline isolation from fur permeability, swelling, water saturation, thereby protecting the metal pipe from corrosion, protection of the insulation from the negative impact of the environment and increase the service life of isolation.

Then the pipeline sprinkle a layer of sprinkled 4, treated with an organic binder TDC on THE 38.101960-83, oil, and other organic astringent products with or without additives in the amount of 4-15% by weight of the soil using a rotary transessuale. Chopping the ground with the help of transessuale and processing of organic binder protects against mechanical damage, corrosion isolation in the formation of the embankment of the pipeline. When added to the soil 4-15% organic binder improved mechanical and electrochemical properties. The dependence of physical-mechanical characteristics of the soil, depending on the dosage TDC-L (astringent pipelines years) and storage time, and the dosage TDC-C (astringent pipelines and winter) and Arlan oil are presented respectively in tables 1 and 2. Improving the longitudinal stability of the pipeline at the dosage of binder less than 4% is not achieved due to low values such soil properties as durability, grip and Vodopivec. At the dosage of binder in the range of 4-15% by weight of soil corrosivity reaches low values, significantly improve the gas and water permeability, swelling and water saturation, providing protection of metal pipes from corrosion, protection of the insulation from the negative impact of the environment and increase the service life of isolation.

In conclusion, form a mound 5. In areas where there is a danger of destruction of the earthen mounds 5, for example, under the action of the wind in sandy soils or water on the slopes, the ground rises process organic astringent TDC THE 38.101960-83, oil, and other organic astringent products with or without additives in the amount of 4-15% by weight of the soil, while in the interval dosing knitting basic strength and hydrophobic properties of the soil reaches its maximum value. Adding binder less than 4% and more than 15% does not provide stability of dikes against wind and water as the values of strength, adhesion and water-stability does not satisfy the requirements. The dependence of physical-mechanical properties of soil from the dosage binder are presented in table 3.

In the laboratory and on the ground experimental studies on laying on the time determined the main indicator of quality insulation coatings - transient electrical pipe-to-earth, and adhesion of insulation and corrosion on metal pipes. The results of the field tests are shown in table 4.

Laboratory and field studies have shown that the protective properties of the coating of pipelines with sprinkled ground, treated with an organic binder, the decrease is much slower. Adhesion of insulation to metal pipes is much higher when the coating of pipelines soils treated with cementitious products. Improvement of soil properties layer preparation layer and sprinkled pipelines increases the service life of the pipes, as there is no corrosion of the metal.

Thanks to improved physical and mechanical properties of soils treated with cementitious products, namely low values of gas permeability, filtration, water saturation, corrosiveness, swelling, high values of the coefficient of water-stability and grip, the contact resistance of insulated pipes decreases slightly. As you know, the deterioration of the protective properties (aging) coating occurs under the action of the environment upon contact with air, oxygen, ozone, etc., water and electrolytes. Taccom effect namely, that water moves to the cathode (tube) and are accumulated in the pipeline, accelerating the process of vlagonasyschennyh. Therefore, the improvement of physical-mechanical properties of soils treated with astringent, reduces the reduction of contact resistance insulation over time, and reduce sweating and leaching of plasticizer and other components of the insulation materials. Thus, the coating of an insulated pipeline soils treated with cementitious products, wraps (or screen), preventing the negative effects of the environment on the protective insulation properties. This greatly increases the service life of isolation that allows you to operate the pipeline for a long time without re-insulation and repair.

The present invention will find wide application in pipeline transport in the construction of onshore pipelines.

Claims

1. Method of laying a pipeline, consisting in laying a stand-alone pipeline layer preparation, the coating of the pipe and backfilling the soil layers and layers of training and sprinkled treated with an organic binder in a similar mound, the soil of the mound also process organic binder, and to expand the range of application of soil treatment broaden the range of content of the organic binder in an amount of from 4 to 6 and from 8 to 15% by weight of the soil above layers and embankments.

2. The method according to p. 1, wherein as the organic binder used astringent trunk pipelines, oil.

 

Same patents:

The invention relates to the construction and used in the repair of pipelines crossing the water obstacle

The invention relates to the construction and approved for installation of underground drainage collectors in water-saturated soils

The invention relates to construction and is used in the repair of piping through the swamp

The invention relates to the construction of pipeline transport of oil and gas and is used in the repair of pipelines

The invention relates to the construction and used in the repair of underground metal pipelines

The invention relates to construction and is used in underground pipelines in mountainous terrain

The invention relates to construction and is used in the construction and repair of pipelines which are laid mainly in swamps, and in a weak water-logged soils and granular Sands

The invention relates to construction and is used in the repair of underground pipelines

The invention relates to the construction and used in the repair of pipelines prone to stress corrosion cracking under tension

The invention relates to construction and is used in the overhaul of oil and gas pipelines

FIELD: construction, applicable for trenchless laying and replacement of underground pipe-lines.

SUBSTANCE: a reciprocating striker is positioned in the casing of the pneumatic percussion mechanism. The air-distributing system of the mechanism includes the front and rear working chambers, inlet and exhaust valves and a fixture for closing and opening of the exhaust channels made in the form of a spring-loaded end face stopper coupled to a tractive member. At actuation of the pneumatic percussion mechanism, before the supply of compressed air, the exhaust channels are closed, they are opened after the inner cavities of the pneumatic percussion mechanism are filled with compressed air.

EFFECT: provided automatic cyclic action of the pneumatic percussion mechanism.

3 cl, 3 dwg

FIELD: construction engineering; erection of pipe lines in thawing permafrost soils and in flooded areas.

SUBSTANCE: proposed method includes ditching at trench with widened areas located at definite distances and pipe line is laid on bottom of trench. Pipe line is covered with flexible rugs and bottom of trench at widened areas is also covered with rugs; edges of rugs are fastened in widened areas and trench is filled. Used as anchor member are cylindrical textile containers placed in lugs of flexible rugs in parallel with pipe line and filled with soil. Prior to fastening the edge sections of flexible rugs, each of them is tightened at fixation of tension; preliminary tension of edge sections is effected during filling the widened areas and trench soil ensuring contact of flexible rugs with bottom of widened areas and trench. Filling the widened areas and trench is performed in direction towards pipe line, symmetrically relative to it.

EFFECT: enhanced reliability of attachment of pipe line at 0required marks.

13 cl, 4 dwg

FIELD: construction engineering; erection of pipe lines in permafrost soils at alternating terrain.

SUBSTANCE: trench in smooth terrain and in sections cut by hydrographic net is dug in active layer at depth sufficient for location of upper generatrix of pipe line above level of daily level. Prior to laying the pipe line, bottom walls and berms of trench are lined with cloth of non-woven synthetic material. backfill soil is placed in ballasting polymer panel-type devices or in ballasting polymer container-type units suspended from pipe line. Anti-erosion partitions made from non-woven synthetic material are formed in sloping sections together with funnel whose neck is located downward of water flow embracing the pipe line at specified clearance between neck and pipe line. Funnel is formed by covering the natural slope of backfill soil by free lower edge of non-woven synthetic material with ballasting polymer panel-type or ballasting polymer container-type devices placed on lower portion of funnel followed by subsequent removal of embankment protecting the pipe line. As far as sections of route cut by hydrographic network are concerned, anti-erosion partitions are formed in trench at transients with opposite slopes of microterrain; anti-erosion partitions are made from anti-erosion cloths and backfill soil is placed n soil-filled weighting materials attached to pipe line. At low points where opposite sections cross, water pass or water bypass structure is formed in trench.

EFFECT: enhanced reliability; reduced scope of earth-moving work; enhanced stability of pipe line in horizontal plane.

9 cl, 8 dwg

FIELD: pipe line transport; major repair of pipe lines.

SUBSTANCE: proposed method includes introducing the front end of pipe into damage pipe and forming hermetic cavity in inter-pipe space; then, pressure air (gas) is charged into hermetic cavity for motion of new pipe inside damaged pipe, after which piston is fitted at end of new pipe and detachable flange is connected to rear end of damaged pipe; motion of new pipe is effected by periodic charging of air into hermetic cavities; each hermetic cavity is bounded by piston and seal.

EFFECT: reduction of tractive force.

5 dwg

FIELD: construction engineering; erection of underground pipe lines in permafrost soils, in bogs and in flooded and marshy areas.

SUBSTANCE: proposed polymer container ballasting unit has two distance rigidity frames located on both sides from pipe line, reservoirs made from polymer commercial cloth and filled soil which are secured to said frames, anti-erosion partitions and upper and lower weighting belts. Distance rigidity frames are curvilinear in form and their height exceeds diameter of pipe line being ballasted. Bend of each frame is made at obtuse angle and lower part of each frame is inclined towards pipe line relative to trench bottom. Polymer commercial cloth laid along pipe line makes distance frame rest against ground of trench bottom both in filling the reservoirs with soil and at action of pushing-out load.

EFFECT: extended functional capabilities.

3 cl, 1 dwg

FIELD: laying or reclaiming pipes.

SUBSTANCE: method includes removing upper layer of spoil, developing side trench with disposal the spoil by damping. The development of side trenches is performed step-by-step. The stripped trench is provided with stripping machine, the side trench are deepened by the working members of the stripping machine below the bottom of the pipeline and pipeline is continuously stripped by trenching machine and stripping machine when it moves forward. The stripping machine has frame with running carriages, clamps, supporting members and mechanism for forward motion.

EFFECT: enhanced efficiency.

3 cl, 4 dwg

FIELD: construction.

SUBSTANCE: pipeline is laid on the concave part of the longitudinal section of the trench bottom on the layer of soft soil and is locked by filling one or two layers of soil with compacting. Screw vertical anchors and load-carrying belts are then mounted. Before filling the trench, the space between the belt and pipeline is provided with a cloth of unwoven synthetic material.

EFFECT: enhanced reliability of pipeline locking.

4 dwg

FIELD: pipeline transport.

SUBSTANCE: flexible pipeline comprises several pulp lines provided with chambers with ball check valves and interconnected through piping diaphragms. The outer surface of the pulp line is provided with a displacement device for movement along the pipeline. The sections of pulp lines receive shell made of layers of syntactic and polyurethane, the ratio of thicknesses of which is (10-4):1. The displacement device affects the piping diaphragm, pumps hydraulic mixture from the bottom section to the next one which is arranged above the check valve, and moves along the outer side of the pulp line to the next piping diaphragm mounted above.

EFFECT: expanded functional capabilities.

3 dwg

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

FIELD: construction.

SUBSTANCE: working member comprises rotors provided with teeth arranged symmetrically with respect to the axis of pipeline and provided with drive and mechanism for bringing the rotors together and moving them apart. Each rotor is provided with cleaning device which is arranged behind the rotor and secured to the unmovable segment of the working member for keeping it unmovable or permitting rotation. The cleaning members permanently co-operate with the outer side of the rotor.

EFFECT: enhanced efficiency.

1 dwg

Up!