SU1465502A1 - Soil-lifting pipe of air-lift dredger - Google Patents

Abstract

The invention relates to construction works and is intended for excavation in submerged offsets. The goal is to improve the efficiency of the use of a soil-lifting pipe by increasing the reliability of work and simplifying the design of devices for mixing soil and air sources. The soil lifting pipe of the dredge includes a suction pipe (T) 2 with a tip 3, an air-lift chamber (K) 5 connected to a source of weak air, and a device for mixing groundwater and air flows. The latter is made in the form of curvilinear inserts (B) periodically placed in a vertical plane along the length of the pipe. 6. Each B 6 is installed with the possibility of longitudinal movement by means of an individual (L

Description

one

The invention relates to the construction machine 1 and is intended for the development of soils in underwater fences.

The aim of the invention is to increase the efficiency of the extraction of a soil-lifting pipe by increasing the reliability of operation and simplifying the design of the device for mixing soil and air flow.

FIG. depicts the g-rhod-lift tube of an air-lift zb MSnar assembly, side view; in fig. 2 - an insert with a Z-shaped bend; on fig.Z - soil lifting pipe, transverse

cross section.

The earth-lifting pipe of an air-lift dredger consists of pa; Pipeline 2 placed on frame 1 with suction tip 3 connected by pipe 4 to a source of air in an air-lift chamber 5, insert 6 ABC length, an individual drive 7 in the form of a hydraulic cylinder with a rod 8 connected to an insert 6. FIG. . 1-3 are indicated; 9 - part of the cross section of pipeline 2, occupied by a ground flow; 10 - part of the pipeline section, occupied by the air flow 11 - bottom ground, No. 1-3 - numbers

drives (hydraulic cylinders); I-III - numbers of inserts.

The soil lift pipe of an air-lift dredger can be used as follows.

The soil lifting pipe is lowered into the water area of the bottom. The cavity of the pipe 4 is filled with water. The compressed air is supplied through pipe 4 to the air-lift chamber 5. The air from chamber 5 enters the cavity of pipeline 2, and a current arises into pipeline 2. Inlet t suction tip 3 to the ground I.

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The leaking to the tip 3 with a stream of water erodes soil II and carries it into pipeline 2. A mixture of three components flows in pipe 2: water, soil and air. When flowing in a sloping pipeline 2, the soil / water mixture is stratified: the water-soil mixture 9 (Fig. 3) flows in the lower part of the section of pipeline 2, the air flow 10 in the upper part. Both of these streams are included in Box 6. In Box 6, it is imperative that the flows 9 and 10 be mixed. After passing through the Insert 6, the separate streams 9 and 10, as a result of mixing, become a single water-air stream. The simplest type of insert can be a spiral and a Z-shaped bend. FIG. 1 shows an insert 6 in the form of a spiral placed in a vertical plane; FIG. 2 - in the form of a Z-shaped bend. When passing through the spiral contour section of the pipeline, the groundwater and air flows intersect. From the loop of the spiral section comes a stream of water-ground mixture. When Z-shaped bend (Fig, 2), the input end A can be higher or lower than the output torp C .. In any case, the stratified flows 9 and 10 are mixed. By points accumulate here and overlaps the entire cross section of the pipeline. The upper air flow 10 breaks through the groundwater plug, takes it with you, carries it away. plot of the sun and scatters. The stream becomes water-ground, B

when end A is higher than end C, lower stream 9, which is more inertia, tends to maintain its direction of movement, closes the cross section of the pipeline in upper bend.

After the insertion of the insert 6, the flow of the water-substrate mixture flows through pipe 2, stratifies into flows 9 and 10, reaches the second section ABC, passes through it, mixes and continues until it reaches the surface. It is poured into the hopper and transported to the place of installation by a soil pump.

The distance between the inserts 6 in the pipeline 2, on which stratification of the water-soil mixture of the pipe mix into streams 9 and 10, occurs, has a different value for different angles of inclination - the GROUND lifting pipe. In order for the GRUNTO lifting pipe to work on the optimal flow pattern of the water / air mixture when the tilt angle of the device is changed, it is necessary to establish an appropriate distance between adjacent local inserts 6. This is done using the fitting method. Lower the soil lifting pipe into the water area of the bottom. Drives No. 1 and No. 3 are put into operation so that Insert I moves close to the airlift chamber 5, and Insert III to the bunker of a ground pump (not shown). At the same time, the Itok 8 of the drive 1 is fully pushed into the hydraulic cylinder, and the rod 8 of the drive

No. 3 is fully extended from the GIDRO1O1linder. Approach tip 3 to the ground 11 and develop the ground.

Drive No. 2 is put into operation and the insert II is moved from the lowest position to the highest position. Upn this fixes the readings of the instrument recording the losses in the ground lifting pipe (usually a vacuum gauge). The instrument reading is determined to correspond to the lowest values of head loss. Switch work

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Drive number 2 and move the insert - II from the extreme upper position vnige. Fix the instrument readings. When the instrument reaches the reading corresponding to the smallest value of head loss, the drive number 2 is switched off from work.

 Start to search for the optimal position of the insert I. By analogy with the previous movement of the insert I from the lowest position to the highest position, they find the position of the insert I, corresponding to the smallest value of head loss in a lifting pipe. Insert I is fixed in this optimal position. After that, the optimum position of the insert III is found and fixed. Then, the development of the soil is carried out at the optimum operating mode of the device.

F o

rmula of invention

Claims (3)

1. A soil lift pipe for an air-lift dredger, including a suction pipe with a tip, connected to an air source by an air-lift chamber and tool for mixing groundwater and air streams, made in the form of an additional airlift chamber and air collector, characterized in that, in order to increase the efficiency of using a submersible pipe by increasing the reliability of operation and simplifying the design of the device for mixing the soil and air streams, periodically placed in a vertical plane along the length of the pipe curved inserts, each insert is installed with the possibility longitudinal movement by means of an individual drive. 2. A pipe according to Claim 1, characterized in that each insert is in the form of a spiral. 3. A pipe according to claim 1, in accordance with claim 1, so that each insert is made in the form of a Z-shaped bend. Fi.Z