SU1532658A1 - Method of constructing enclosed drainage - Google Patents

Abstract

The invention relates to the field of drainage of land and can be used in the construction of closed combined drainage on reclaimed land. The purpose of the invention is to improve the reliability of the interface of well amplifiers with a drainage collector and to reduce head losses during the flow of water from the well amplifiers into the drainage collector. The method is implemented as follows. The construction of well amplifiers 1 is carried out along the axis of the drain collector 15. The upper portion of the filter string of the enhancer well is placed below the bottom 7 of the drain manifold and is perforated. At the time of sprinkling the filter column 5 of the borehole-amplifier 1 with gravel mixture 3 and carrying out construction pumping out of the borehole, it is covered with a tubular head. The upper end of the tubular tip is extended to the surface of the earth. After construction pumping, the tubular head is removed and a collector drain 15 is laid. 1 Cp f-ly, 4 ill.

Description

(L

Fig.Z

15. The upper portion of the filter string of the booster well is placed below the bottom 7 of the collector drain and is perforated. At the time of sprinkling the filter column 5 of the well-amplifier 1 gravel mixture 3 and carrying out construction pumping

i The invention relates to draining

(land and can be used

jnpn construction closed

nirovanny drainage on reclaimed

land x.

The aim of the invention is to improve the reliability of the interface of the well-amplifiers with the drainage collector and to reduce the pressure loss with the flow of water from the well amplifiers into the drainage collector.

Figure 1 shows the scheme of drainage; figure 2 - section aa in figure 1; on fig.Z - section BB in figure 1; in Fig.4, the well-amplifier in the period of overlapping of the upper end of the filter column with a stopper, vertical section.

The method of construction of drainage is implemented as follows.

Initially, drilling wells-amplifiers 1 with a diameter of 400-500 mm are drilled along the route made to the terrain, for example, using a 1VA15B or URB-ZAM machine with installation of filter columns 2. For example, from BT-6 and BT-9 asbestos-cement pipes - 150 mm or from polyethylene (PVP) pressure pipes of medium and heavy type with an outer diameter of 90-160 mm and a filtering device 3 of gravel mix with a particle size of 2 - 20 mm. Filter column 2 of each well-amplifier 1 is performed in the lower part with a water intake filter 4, and in the upper part 5 with perforation. In order to avoid silting up the filter column, the 2 holes in the filter frames are inclined at an angle of 30-45 ° with a rise in the direction of the pipe axis. The parameters of the intake filter 4 is chosen in the usual way. The length of the perforated part 5 is equal to 1.0

1 ,, the diameter of the holes in it is not more than the wall thickness of the pipe, for example, 5-10 mm, the frame porosity is up to 5%. The upper end 6 of the filter column from the well overlap it with a tubular tip. The upper end of the tubular tip is extended to the surface of the earth. After construction pumping, the tubular head is removed and a collector drain 15 is laid. 1 Cp f-ly, 4 ill.

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five

5 °

five

five

2 amplifier-wells 1 are placed 0.3-0.5 m below the design bottom 7 of the drainage trench 8. To enable the filtering device 3 and carry out the construction pumping out of the well 1, a tubular head 9 is pressurized to the filter column 2 with the annular gap sealing gland 10, for example, of hemp strap or rubber ring and resting it on the ring stop 11, performed below the perforated part 5 on the filter string 2. After lowering the filter string 2 into the well in the usual way and spraying it with gravel mixture 3 to overhnosti ground in a filter 2 mounted airlift column (not shown) and is carried out in a conventional manner pumping construction. The subsidence of gravel filter dusting 3 during construction pumping is compensated by pouring it into the annulus.

At the end of the construction pumping, the airlift is dismounted and the top end opening 6 of the filter column 2 (water outlet filter cage) is closed with the stopper 12 of the material that is not destructive in water. The plug 12 is lowered through the tubular tip 9 on the rod 13. Then the tubular tip 9 is removed from the borehole 1. At the same time, the surrounding gravel mix 3 rises and falls to the top of the filter column in the well not 1. The level of the gravel mix 3 should be 0.3-0 , 5 m above the design top of the filter dusting 14 of the reservoir 15 to compensate for possible subsidence of it before the construction of the drain collector 15. If necessary, it is added to the well 1. The sand-gravel mix 14 used at the top is above this level construction Closing the horizontal drains reservoir 15.

Upon completion of the construction of the well-amplifiers, a closed drain collector 15 is laid over them in any way, for example, trench ones. At the intersections of the horizontal drain drain collector 15 gravel dusting 3 water-conducting elements above the filter columns of the well amplifiers 1 drainage pipeline for a length of about 1.5 -2.0 m are made with a duty ratio increased to 3-4% (maximum possible), openings in the form of transverse slits with dimensions of 2x10 mm. Finally, the hydraulic coupling of the booster wells to the drain collector 15 through the filter dusting 3, 14 is achieved.

Claims (2)

1. The method of construction of a closed drainage, including the execution of well-amplifiers along the axis of the drain-collector with dusting of filter tubes. Lonn gravel mix, the laying of the tree 0.3-0.5 m below the bottom of the drain-collector. %  1 0 0 five five collector and mating it with wells-plugs, characterized in that, in order to increase the reliability of coupling wells-amplifiers with drainage collectors and reduce head losses during water flow from the well-amplifiers into the drain-collector, the upper section the filter columns are placed below the bottom of the drainage collector and perforated, while for the time of filtering the filter column with gravel mixture and carrying out construction pumping from the well, the upper part of it is covered with a tubular head, the end of which is brought to the ground surface, and after construction pumping, the tubular head is removed and a drainage collector is laid. 2. The method of pop. 1, characterized in that during the construction of the amplifier well, the upper portion of the filter column is placed on  I j  .  I  AND No -I to I Kommersant & LYaFYAZ, B sy-sft sy. & MJJA Sj Ш2 -R-.O :: : #; # z oo about- . VLI about in 00 % ъ «« I: oh. about. ° :: o-.u. ABOUT . about/. d. . .o "H ..:": about. r-o ---: bv. . : .. .. ABOUT ... ;  ABOUT Fm.ch