Device for protecting anchors from pipelines

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

 

The present invention relates to the field of construction of pipelines which are laid out on the marshes, in the mineral water-saturated soils, obvodnennyh terrain (prospective flooding, high ground water levels) with fixing them on the project marks a screw anchors.

In the underground pipeline because of the action of the internal pressure p and a positive temperature difference Δt occur longitudinal compressive force P. If non-axial its application increases the deflection of h curvatures. On the concave curves of the longitudinal profile of the bottom of the trench, the pipeline moves down that paleobotany trench (from the lowering of groundwater seasonal fluctuations) excludes the impact of the anchor or decreases in a flooded trench.

It is known device for laying flexible pipe on ground support areas of its deflection under its own weight, including trench excavation, laying of pipeline, its fixing anchors and backfill the trench (USSR Author's certificate No. 1150427 A, class F 16 L 1/028; E 02 D 27/46, 1985). To reduce the load on the anchor when heated pipeline transported product on the bottom of the trench made feet that elevate above the floor and placed along its length at a distance from each other, and anchor set between the supports in the AOR is e greatest deflection. Support perform a height of 10-30 cm long, 0.5 to 3.0 m, the Pipeline is laid on a support, the axis of the bend becomes wavy. When the heat pipe is lengthening, resulting in its convex sections are moved upward, lifting the soil backfill, and concave - down, relieving the anchor.

The disadvantages of the device are as follows.

The scheme of fixing the Flex of thin-walled pipes made of plastic, steel sheet or corrugated metal. For maximum deflection of the pipeline from its own weight it hangs between the legs, not touching the bottom of the trench. Despite this engineering solution for large diameter pipes are required in areas with increased step installation of anchors. Maximum permissible norms of the step is equal to 25 m, However, the walls Flex prone to damage in the node transmission load. Therefore, the step for installing anchors limit. The average step installation of anchor devices of the type of WAH-1 for pipe with a diameter of 1420 mm, equal to 4.5 to 6.0 m, see Azarov VS TO the issue of the carrying capacity of helical anchors used to secure the pipelines. Proceedings of VNIIST "Ballasting and fastening of pipelines", 1998, ñ.38. On MAGNETOM the area you want to put a few anchors. This should be fixed convex areas, as norm solution is try to use ballasting the ability of the protected soil backfill.

Under the bottom of the pipeline (in the gap between it and the bottom of the trench reaches the soil backfill from fraying or pulling in water. This process is promoted by reliance on the bottom of the trench, working as a jumper. Over time, the gap is filled with soil.

It is known that during testing of the pipeline and the operation he works in a series of “load-unload”. In the case of load concave section on the device anchor type, a gap between the pipeline and power belt, which enters the soil backfill, including solids.

During the unloading phase, the presence of soil in the gap does not allow him to occupy its original position. So anchors will be loaded. The alternation of these cycles leads to increased output of anchors, including a breakdown. Filling the ground clearance between the pipe and the bottom of the trench alters the schema of work Flex. For these reasons, in the General case, the technical result - the unloading of the anchor could not be reached.

For rigid pipelines such a scheme unloading anchors cannot be used because the required long stretches of deflection under its own weight. From wave bending axis of the pipeline formed extended convex areas where the anchor will be supplied by pipeline (vyderzhivatjsya).

The essence of the image is etenia: rectilinear in plan the route of the pipeline tear trench with lots of different longitudinal bed profile (areas of constant slope, between the disposal area of the concave curve of large radius equal To or more than 5000 m with a hollow in the middle of the curve by the value of h from 5 to 10 cm), occiput layer of soft soil stack pipe, bottom and both sides hit the ground, into the cavities between the pipeline and the slopes of the trench occiput one or two coats of primer with a thickness of 15-20 cm, each layer compacted than eliminate the ingress of soil into the gap between the bottom of the pipe and the bottom of the trench during its unloading, set the anchor device of the type in which the area of the concave curve node transfer the load from the power belt protects device in case of non-woven synthetic material (NCM), which spread out the cloth from the MNC, one half of the paste around the perimeter of the protective Mat for insulation of piping, stack lining Mat, mount the power zone, it is closed with the second half of the cloth (with side inlets on the size of the gap from a deflection of the pipeline), the edge of which is glued to the insulation of the pipeline, and the other sides of the cloth wrap power belt and fix it on both sides of the pipeline, covered the trench with soil.

The need to protect the anchor from moving rigid pipe in areas of concave curves of the longitudinal profile of the bottom of the trench, depending on their length L, trough h, and RA is iusa R we will show by examples. Assume that the pipe from the pipe section 1420×17 mm straight and laid tolerances at its design position are met. Take the deflection h is maximum and equal to 10 cm, see p SNiP sh-42-80* pipelines /Gosstroy of Russia. - M.: state unitary enterprise of CSE, 1998.

The length of the curve of large radius almost equal to the length of the chord, which is determined by the formula L=(8hR-4h2)1/2.

For a radius of 5000 m at the initial deflection of a 5 cm length of the curve is equal to 44.7 m and 63.2 m - h, equal to 10 cm For the radius of 10000 m and the deflection of 10 cm length equal 89,4 m

In the presence of the compensator longitudinal compressive force P is determined by the formula

P=0,5 fσCC,

where F is the cross-sectional area of the pipe wall 1420×17 mm, P=750 cm2;

σCCring voltage from the rated internal working pressure p, MPa, determined according to the formula σCC=nDNR/2 δn,

where n is the reliability coefficient for the load - internal working pressure for gas pipeline n=1,10;

DNR- internal pipe diameter, cm;

δC- nominal wall thickness of pipe, see

The cross section of the pipe 1420×17 mm at a pressure of p=7.5 MPa Hoop stress σCCequal 336,3 MPa. They cause a longitudinal compressive force in the pipeline compensator R, equal 1,261×107N.

Additional deflection in the middle of the curve Δh moment M technology=.h define as for the rod, which rests on the ends on the pivot bearing (not lying on the bottom of the trench), formula Δh=hL2/8EJ.

For the curve length 44.7 m, the deflection of 5 cm and a radius of 5000 m additional deflection Δh equal to 4.14 cm and of 8.27 cm for the radius of 10,000 feet For a curve length 63,2 m radius of 5000 m and the deflection of h equal to 10 cm, more deflection Δh reaches 16,54 see

The pipeline movements down resists compactible soft soil at the bottom of the trench. This soil layer thickness of 10 cm partially settles of its own weight of the pipeline. When it longitudinal compressive force P curvilinear section receives an additional deflection Δh. This causes further compression until the soil density trench intact structure in the middle of the curve. In the General case on a curved section of the longitudinal profile of the trench bottom layer of soft soil is additionally compressed by no more than 3-5 see Thus, the bottom of the trench limits the deflection of the curved section in comparison with the scheme of the pipeline in the form of a rod, which rests on the ends on the pivot bearing.

Additional deflection of 3-5 cm is sufficient to relieve the anchor. However, the anchor device type you want to protect the host transfer the load through the power zone on the pipe from getting g the NTA or solid inclusions.

Figure 1 shows the position of the pipeline with lots of different longitudinal profile of the bottom of the trench; figure 2 - the straight-ahead position of the pipeline in plan in figure 3 - location of the protective device on the pipeline 4 is a front view of its location.

The protection device anchors 1 from the movements of the pipeline 2 at the site of the concave curve of the longitudinal profile of the bottom of the trench 3 is made in the case of the MNC 4. Inside the case is the node transferring the load from the anchor device type on the pipeline 2: protective Mat 5, felting Mat 6 and the power belt 7.

The device operates as follows. During start-up of the pipeline 2 in the operation due to the pressure of the product and its positive temperature gradient appears longitudinal compressive force 8. Since the area of the concave curve of the longitudinal profile of the bottom of the trench 3 is located between areas of constant slope, including zero 9, from non-axial application of compressive efforts 8 by the value of h, concave curve moves down. Pipeline 2 receives an additional deflection Δh at the compaction of soft ground 10. In paleobotany trench (from the lowering of groundwater seasonal fluctuations), a gap between the power belt 7 and the pipe 2. Protective device in case of MNC 4 protects the host transfer the load h is cut the power belt 7 to the pipe 2 from the ingress of soil or solid inclusions. In addition, the ground cannot fall into the gap between the pipe 2 and the protective cover 4, as it is on the perimeter 11, 12, 13 and 14 of the protective Mat 5 glued to the insulation of the pipeline. The protective cover has an inlet 15 on the ends of the lining Mat 6 by the amount of clearance from the additional deflection Δh, which prevents it from tearing or damage.

The location of the protective device on the pipeline mechanism eliminates the load of the anchors in the series of “load-unload”. The ground cannot fall into the gap between the security belt and pipe. When the reduced deflection of the pipeline during its operation, such as lack of electricity or the production of rescue and recovery operations, anchor work on the perception of Archimedean force. Pipeline 2 is returned to its original position. This forms a gap between the bottom of the pipe and the bottom of the trench. Therefore, during the pipe-laying it hit the ground and occiput one or two layers of soil with the seal 16. The presence of the compacted soil prevents loose in the gap. In a series of “load” is selected, the gap between the bottom of the pipe and the bottom of the trench.

Thus, the location of the protective device in case of MNC at pipeline node transfer the load from the power belt anchor device type protects the anchor from the impact of the pipeline.

The protection device anchors from the impact of the pipeline on the site of the concave curve of the longitudinal profile of the bottom of the trench, including the laying of pipelines on the layer of soft soil, fixing it by dumping one or two layers of soil compaction, installation of vertical screw anchors, installation of power zones and backfilling the trench with soil, characterized in that the anchors on the perception of Archimedean force generated by the load, the gap between the security zone and the pipeline to protect against the ingress of soil or solid inclusions, which at the location of the power belt before mounting it spread cloth with non-woven synthetic material (NCM), paste along the perimeter of the lining Mat to pipeline insulation, perelistyvat ends over power belt fastening and an overlap on the sides and hanging ends tied to tagum belt.



 

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