SU1555585A1 - Method of laying pipeline across a water obstacle - Google Patents

Abstract

The invention relates to construction and can be used in the construction of underwater crossings of pipelines, as well as in the construction of engineering networks in hydraulic engineering and land reclamation construction of pipelines with a diameter of more than 400 mm. The purpose of the invention is to increase productivity by reducing the volume of earthworks and eliminating the installation of ballasting weights. A leading trench 27 is passed from the rip-hole notch at the bottom of the reservoir 1, filled with soil and clay mortar. At the same time, cutting of the segment-shaped notches 30 forming the well, the diameter of which exceeds the diameter of the pipeline 29, is made in the walls of the trench 29 , in front of the head of which, on a traction cable, a bush of shaper is placed, through which the segmental grooves 30 are molded with compaction of the borehole wall. 1 Cp f-ly, 3 ill.

Description

one

(21) 4187654 / 23-29

(22) 01/28/87

(46) 04/07/90. Bul № 13

(71) Republican Design Engineering Institute Ukrorgtehstroy

(72) I.E. Marinich (53) 621.643 (088.8)

(56) Patent of Great Britain

No. 1549681, cl. F 16 L 1/04, 1976.

(54) METHOD OF GASKET PIPING THROUGH WATER BARRIER

(57) The invention relates to the construction and can be used in the construction of underwater crossings of pipelines, as well as in the construction of engineering networks in hydraulic engineering and land reclamation construction.

Aa

WITH

Fig.z

from pipelines with a diameter of more than 400 mm. The purpose of the invention is to increase productivity by reducing the volume of earthworks and eliminating the installation of ballasting weights. A leading trench 27 is passed from the rip-hole notch at the bottom of the reservoir 1, filled with soil and clay mortar. At the same time, in the walls of the trench at the design depth, the invention relates to

construction and can be used in the construction of underwater crossings of pipelines, as well as in the construction of engineering networks in hydro-technical and land reclamation construction of pipelines with a diameter of more than 400 mm.

The purpose of the invention is to increase productivity by reducing the volume of earthworks and eliminating the installation of ballasting weights.

FIG. 1 shows the development of a leading trench with segmental grooves in its walls; in fig. 2 - pipeline punching into the well formed by segment grooves; in fig. 3 is a section A-A in FIG. 2

The pipeline is laid as follows.

On both sides of reservoir 1, in the alignment of the planned transition, by means of earthmoving machines (for example, excavators), they tear off near-dozed temporary excavations with a depth of more than -the size of the draft of the craft 2.

On the shore of a water obstacle, a traction device 3 located at the receiving platform 4 is mounted. At the launch site 5, a hydraulic jack battery 6 is installed. The platforms 4 and 5 are shielded from the water obstacle with shields, and 8 with sealed holes 9.st On the launch pad 5 place the pipeline 10 for feeding the clay mortar and create a supply of mounted hollow formative 11.

On the watercraft 2, a ground cutting unit 12 is placed with a submerged electric drill 13, an airlift system with a guide tube 14, a slurry-water pipe 15 connected to a horizontal 16 and an attachment 17 slurry lines. In add 18 place

cutting segmental grooves 30 that form a well whose diameter exceeds the diameter of pipeline 29. A pipeline 29 is dragged into the well, before the tip of which a bend of shapemakers is placed on the traction cable, through which the segmental grooves 30 are formed with compaction of the well wall 30. 1 h. pfl, 3 ill.

a drill rod 19, carrying ring plow working bodies 20, with a barrier wall 21, on the lower end of which a roller 22 is fixed. The drill rod 19 and the barrier wall 21 are mounted with the possibility of vertical movement.

In addition, the watercraft 2 contains a tank 23 for storing lumpy clay reserves, a side winch 24 with a cable 25, and also a dissolved unit 26 for preparing and cleaning mud that is used in an airlift system.

The electric drill 13 in the medium of the mud is used to develop the underwater leading trench 27 to a depth exceeding the level of the pipe laying axis 28 29. The development width of the trench 27 depends on the diameter of the laid pipeline 29 and must be less than this diameter.

Destroyed soil is airlifted to the watercraft 2, where it is separated from the mud solution at the mortar unit 26 and returned to the trench 27 using the slurry channels 16 and 17. Simultaneously, the movable drill rod 19 is cut into both walls of the trench by means of the working body 20. 27 along the axis 28 of the pipeline 29. At the same time, the developed soil from the recesses 30 is deposited in the lower part of the trench 27. Taking into account the laying depth of the pipeline 29 and the ratio of the equal volume of soil removed from the segment recesses 30 and the volume of the trench 27, The downstream pipeline 29 is determined to determine the depth of the leading trench 27.

After completion of the development of the soil on the left bank of the water barrier in the area of the marginal excavation by

the roller 22 into the trench 27 introduces the cable 25, one end of which is fixed on the side winch 24. But as the trench 27 penetrates, cutting the recesses 30 therein and moving the floating device 2 in the direction of the opposite bank to the cable 25 through equal distances and fix it Shapers 11, whose diameter is larger than the diameter of the pipeline, however, are smaller than the diameter of the segment grooves 30.

The formers 11 are introduced by means of a cable 25 into segmental grooves 30 and simultaneously along pipeline 10, brought out through shield 7, mud is pumped into trench 27 under a pressure not lower than the average household ground pressure at a laying depth of pipeline 29.

The clay solution prevents the collapse of the segmental grooves 30 and the walls of the leading trench 27, and also reduces tractive force when pulling the pipeline 29. Through the hydro-fold battery and the side winch 24 periodically reciprocally move the Shapes 11 to the segmental grooves 30. After the trench 27 is created, the cable 25 detaches from the side winch 24 and secured on the traction device 3, and the tail end of the cable 25 is connected to the tip of the pulled-through pipeline 29. The pulling of the pipeline 29 is carried out with dnovremennym his gidrodomkratnoy forcing the batteries 6.

The formers 11 hold the cable 25 along the axis of the well formed by the segment recesses 30 and coincide with the project axis 28 of the laying of the pipeline.

As the pipeline 29 is pulled through, the clay solution is displaced into the settling tank, and the Shapers 11 are dismantled and stored at the receiving site 4. After the pipeline 29 is laid, the slightest excavations of the reservoir 1 are covered with soil.

Example. A pipeline of 820 mm in diameter is laid through a water barrier of 10 m depth and deepened into the bottom of the reservoir, while the distance from the upper generator line to the natural bottom is 2 m. The width of the leading one is accepted.

ten

5585

trenches equal to 1/3 of the pipeline diameter, i.e. 0.27 m, and the diameter of the segmental grooves is prescribed, taking into account the stability of the overhanging arches of the leading trench over the walls of the segmental grooves, as well as the gap between them and the pipeline pulled through, necessary for pumping the mud. The diameter of the segmental grooves is equal to 1.15 of the pipeline diameter, which is 0.94 m. The depth of the leading trench lying below the pipeline is 1.6 m. In order to prevent the trench walls and segmental grooves from collapsing, mud is pumped into the trench a pressure exceeding the household pressure for a given pipeline laying depth, which will be 0.15 MCa. However, the pressure of the mud should be increased, taking into account local specific losses to filter the solution into the soil and backfill. The invention makes it possible to reduce the amount of underwater earthworks and reduce the material consumption of the underwater crossing.

15

20

25

Claims (2)

1. A method of laying a pipeline through a water obstacle, which consists in developing an underwater trench, removing the developed soil with its re-laying into a trench after pulling the pipeline into it by connecting the cable to its head, which is designed to increase productivity by reducing the volume land works and the elimination of the installation of ballast weights, the trench is developed below the laying mark of a pipeline 1 / 3-1 1/2 of its diameter and at the same time in the walls of the trench The CT mark forms a well by cutting segmental grooves along the axis of the pipeline being pulled in. 2. The method according to claim 1, characterized in that the re-laying of the soil in the trench is carried out before pulling the pipeline, while on its traction cable before the tip, put on a worm driver bead. S Yu A 5 tf 2 Figg