RU2335684C1 - Method of pipeline backfill and device for its implementation - Google Patents

Abstract

FIELD: technological processes; construction.

SUBSTANCE: frame equipped with sieves and vibrator is installed on trench edges above pipeline covered with thin layer of soft earth. Frame dimensions correspond to trench width. Sieves are divided into zone with slotted cells that are symmetrically installed in relation to central zone that corresponds to pipeline diameter. Two side zones from central zone to trench walls are equipped with cells that correspond to the largest permissible size of major inclusions. Earth from excavator bucket is dropped into central zone, and vibrator is switched on. Soil is graded in accordance with sizes of fractions, at that fine fractions of soil are sifted on pipeline in central zone. Large fractions (from 100 mm to 300 mm) drop through slotted cells closer to trench slopes, filling trench between trench slopes and pipeline. Blocky soil with size of more than 300 mm rolls down by gravity to trench borders.

EFFECT: increase of pipeline reliability.

2 cl, 2 dwg

Description

The invention relates to the construction of pipelines, in particular to a method of backfilling pipelines in soils with large inclusions in the trench with slopes after repair or construction work and to a device for protecting the insulation coating and the pipeline itself from damage when backfilling by the proposed method.

A known method of backfill from SNiP III-42-80 with changes from 1982 and 1986

"Building regulations. Main pipelines ”, introduced on 01.01.1981, approved by the resolution of the USSR State Committee for Construction Affairs No. 67 of May 16, 1980, section 3. Earthwork, items 3.13, 3.14 (prototype).

According to SNiP III-42-80, when filling the pipeline with soil containing inclusions larger than 50 mm in the trench with slopes after repair or construction work to prevent damage, first fill the pipeline with soil of small fractions with a diameter of less than 50 mm (soft soil) 20 cm thick above the upper generatrix of the pipe or protect the pipeline with a protective coating device, and then backfill with soil containing crushed stone, gravel and other inclusions larger than 50 mm in diameter.

However, this method of work has several disadvantages. After dusting, the pipeline is filled up with a bulldozer or excavator bucket with soil with large rock inclusions of various sizes, while damage to the insulation coating of the pipeline and the pipeline itself is not ruled out, because rocky soil is poured into the trench above the pipeline and from various heights.

The proposed method allows to reduce the possibility of damage to the pipeline in the trench with slopes when filling it with soil with large inclusions after repair or construction work, and therefore, it improves the efficiency of filling the pipeline by filling in two layers, while in the first layer there are small fractions are fed into the zone above the pipeline, and larger fractions are directed along the slopes of the trench, falling asleep from a height of not more than one meter from the top of the trench, with the supply of small and large fractions that are carried out simultaneously or sequentially to completely cover the outer surface of the pipe to the upper edge of the trench and the remaining in the heap largest blocky soil fraction and crushed in the roller is moved over the pipeline or are taken outside the building bands.

The work according to the method is as follows.

Filling the pipeline into the trench with slopes is performed in layers. The first layer to the top of the trench is covered with a single-bucket excavator from the height of the bucket of the excavator, not more than one meter from the top of the trench. Fine fractions (up to 100 mm) are taken from the dump and layered in layers into the trench zone directly above the pipeline sprinkled with soft soil, which eliminates damage to the insulation coating of the pipeline and the pipeline itself during the filling process. The soil from the dump with rocky and blocky inclusions (up to 300 mm) is poured into the slope of the trench by the bucket of the excavator, along which it rolls between the pipeline and the walls of the trench, excluding the effect on the insulation of the pipeline. Filling the first layer with these fractions is carried out to the top of the trench.

The block soil remaining on the brow is crushed and either moved with a bulldozer or excavator into the roller above the trench, or, if there is an excess of soil, it is taken outside the construction strip.

This method of backfilling allows you to protect the pipeline from falling large fractions of the soil.

To implement the method, a device is proposed for protecting the pipeline, which ensures the effective implementation of the filling of the pipeline and the safety of the pipeline from falling block and rock inclusions of soil.

A device for protecting the pipeline from damage during opening is known from the description of the application for invention No. 2002131908 A, published on 10.01.2005, bull. of. 2005, No. 1, IPC 7 F16L 1/028.

The device contains an oval body of the required length, mounted on the exposed part of the pipeline by the excavator bucket using the suspension unit, the shape of which corresponds to the shape of the tooth of the excavator bucket. After opening or filling the protected area of the repaired pipe, the device moves to a new place along the pipeline with the excavator bucket.

As for the requirements for the size of the fractions of the soil used during backfilling, they remain the same as defined by the above normative document SNiP III-42-80.

The inventive method of filling the pipeline cannot be implemented using the above-described known device.

For the effective implementation of the method, a device is proposed that allows to solve the problem of improving the safety of the pipeline when filling it after repair or construction work in soils with large inclusions.

The problem is solved due to the fact that in the device containing the frame, sieves and suspension unit, the width of the frame corresponds to the width of the trench to be poured, and the sieves equipped with a vibrator are divided into zones with slot cells of different sections symmetrically placed relative to the axis of the trench, with the central the zone with the smallest cells corresponds to the diameter of the pipeline, and two side zones with cells corresponding to the largest allowable size of large inclusions are located from the central zone to the walls of the trench.

Design features and advantages of the invention are illustrated by drawings, where

figure 1 shows a side view of a device for protecting the pipeline mounted above the pipe;

figure 2 is a top view of the device for protecting the pipeline.

The device comprises a frame 1, sieves 2 connected to the frame, and a suspension unit 3 to the excavator bucket. A vibrator 4 is fixed on the sieves 2, which imparts vibrational motion to the screens. The dimensions of the frame 1 are slightly larger in width than the dimensions of the trench to be poured.

Sieves 2 are divided into zones with slotted cells of different sections, symmetrically placed relative to the axis of the trench, due to which the soil is sorted according to the size of the fractions.

For sieving fine fractions of the soil in the sieves 2 made the smallest cells. In Fig. 1, this is zone A located in the central part directly above the pipeline 5, corresponding to its diameter. Zones B - two lateral zones with cells, the size of which corresponds to the largest acceptable size for filling large inclusions across in accordance with SNiP III-42-80, located between the central zone (above the pipeline) and the walls of the trench.

The sieves 2 can be made with inclined lateral surfaces symmetrically located relative to the axis of the pipeline, and with zones A and B having cells for sifting small and large fractions of the soil of the same size.

To implement the method, the device operates as follows.

Using the excavator bucket, the tooth of which is included in the suspension unit 3, the device is mounted on the edges of the trench above the pipeline 5, sprinkled with soft soil, as shown in Fig. 1.

The soil from the dump with rock and block inclusions is poured without sorting from the excavator bucket into the device A zone and the vibrator 4 is turned on. In this case, the soil is effectively sorted by the size of the fractions: due to the size of the cracks in zone A and the action of the vibrator 4, only small fractions are sieved on the pipeline soil (up to 100 mm in diameter). Larger fractions (up to 300 mm across) wake up in slotted cells closer to the slopes of the trench, filling the trench between the slopes of the trench and the pipeline. Block soil larger than 300 mm rolls under its own weight onto the edges to the base of the device, without falling into the first layer of backfill and, thus, the safety of the pipeline and its insulation coating is ensured. The soil is poured from a height of not more than one meter from the top of the trench and at the same time, due to the vibrational movements of the screens 2 with slotted cells of different sizes, the possibility of jamming the cells with rock or block inclusions of soil is excluded.

Figure 1 shows the layered distribution of soil over laid on a soil cushion and sprinkled with soft soil pipeline using a new method and device for these purposes.

Layering the soil layer by layer, fill the trench to the top (to the device frame), and then the device is rearranged along the pipeline using the excavator bucket and the suspension unit 3 to a new place

The blocky soil remaining on the brow is crushed or moved into the roller above the trench with an excavator or bulldozer. Excess soil is removed outside the construction strip.

The use of a new filling method and a device for its implementation eliminates damage to the insulation coating of the pipeline, ensures the durability and reliability of the pipeline in operation, eliminates the need for sorting the soil in the dump and increases the productivity of excavation when filling the pipeline.

Claims (2)

1. The method of filling the pipeline with soil with large inclusions in the trench with slopes after repair or construction work, including filling the pipeline with soil of small fractions to create a protective coating on the outer surface of the pipeline and filling the pipeline with soil of fractions of different inclusions, characterized in that the pipeline is filled in layers, in the first layer, small fractions are fed into the zone above the pipeline, and large fractions are directed along the slopes of the trench, filling them with a height of not more than one meter from the top t anshei, wherein the supply small and large soil fractions is performed simultaneously or sequentially to the upper edge of the trench, and the remaining fraction of the soil heap blocky crushed and moved over the roller in the conduit or take out beyond the strip construction. 2. The device for protecting the pipeline when carrying out the method according to claim 1, containing a frame and a suspension unit, characterized in that the frame is equipped with sieves and its dimensions correspond to the width of the trench to be poured, and a vibrator is fixed on the sieves and they are divided into zones with slotted cells of different sections symmetrically placed relative to the axis of the trench, while the central zone with the smallest cells corresponds to the diameter of the pipeline, and two side zones with cells corresponding to the largest allowable size of large inclusions, size Even from the central zone to the walls of the trench.

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