WO2009137848A2 - Puits et procédé de construction d'un puits - Google Patents

Puits et procédé de construction d'un puits Download PDF

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Publication number
WO2009137848A2
WO2009137848A2 PCT/AP2009/000001 AP2009000001W WO2009137848A2 WO 2009137848 A2 WO2009137848 A2 WO 2009137848A2 AP 2009000001 W AP2009000001 W AP 2009000001W WO 2009137848 A2 WO2009137848 A2 WO 2009137848A2
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WO
WIPO (PCT)
Prior art keywords
well
well wall
frusto
conical
hole
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Ceased
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PCT/AP2009/000001
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English (en)
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WO2009137848A3 (fr
Inventor
Abraham Christoffel Van Wyk
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Individual
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Individual
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Publication of WO2009137848A2 publication Critical patent/WO2009137848A2/fr
Publication of WO2009137848A3 publication Critical patent/WO2009137848A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B3/00—Methods or installations for obtaining or collecting drinking water or tap water
    • E03B3/06—Methods or installations for obtaining or collecting drinking water or tap water from underground
    • E03B3/08—Obtaining and confining water by means of wells
    • E03B3/10—Obtaining and confining water by means of wells by means of pit wells
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D1/00—Sinking shafts
    • E21D1/08—Sinking shafts while moving the lining downwards
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use

Definitions

  • THIS INVENTION relates to the extraction of groundwater. More particularly, the invention relates to a method of constructing a well and to a well constructed in accordance with such a method.
  • waterlogged sand refers to sand that is saturated with groundwater. Waterlogged sand is usually found below a certain level in the ground, referred to as the water table. The depth of the water table varies and depends on the area in which the well is constructed. Water-logged sand may typically be found beneath the water table up to a depth were an impermeable layer of clay or sand is found, beyond which water does not pass. Wells are typically constructed by providing a channel from beneath the water table to the ground surface within which groundwater can accumulate and subsequently be extracted to the surface.
  • the channel is usually in the form of a shaft, sunken into the ground, or simply a hole made in the ground which is lined with sand impermeable material so as to prevent sand caving back into the well.
  • driven point wells are small diameter wells made by driving a drive-point well screen, which has a sharp leading end and is connected to lengths of pipe, into the ground to below the water table. The purpose of the screen is to allow water to filter into the driven point well and to keep out the surrounding sand. Water which has accumulated inside the well can subsequently be pumped to the surface through the pipe(s) connected to the screen.
  • a problem associated with the operation of these types of wells is that sand may enter the well and may clog up perforations and/or pipes or damage the pumping system.
  • Tubular wells are wells which have a substantially larger diameter than driven-point wells and are constructed either by sinking a tubular column into the ground to a desired depth below the water table, or by digging a hole to the desired depth below the water table and lining the hole with a sand impermeable well lining, thereby allowing a volume of water to flow into the column from the bottom of the well due to the surrounding pressures of the water table. Water can subsequently be pumped from the volume of water which accumulates in the well to the surface by providing a flow channel from the water volume to the surface.
  • a problem associated with the installation of these types of wells is that whilst sinking the well, well hang-up may occur, wherein the sinking of the well is hindered due to friction and grip of the sand on the outside of the well lining preventing the wall from sinking downwards.
  • the invention will alleviate at least some of the difficulties associated with the operation and installation of the well types as described above, especially in loose ground formations without a binder which may cave in before a lining is installed. Further, due to the diameter of the wall being smaller than the diameter of the leading edge, friction is reduced sufficiently to allow the well lining to slide downwards when material is removed from inside, next to, and below the leading edge.
  • a method of constructing a well including the steps of: selecting a location for constructing a well; excavating material at the selected location to form an initial well hole of a depth which is a fraction of the final depth of the well; providing a first frusto-conical well wall segment in the initial well hole to form a height of frusto-conical well wall, the well wall segment having a bottom end of larger outer diameter than an upper end thereof and the well wall segment and the well hole being relatively sized so that a peripheral space is defined in the initial well hole around the well wall segment; excavating material from the inside of the first well wall segment to deepen the well hole, allowing the first well wall segment to sink deeper as the well hole is deepened; providing a further frusto-conical well wall segment on top of the previous one to extend the height of frusto-conical well wall; excavating more material from the inside of the first well wall segment to further deepen the well hole, allowing the
  • Selecting an area in which to construct the well may involve taking into account factors which may include any of: the depth of the water table below ground level; the depth below an upper level of the water table at which an impermeable layer of clay or sand is found which prevents water to pass beyond it; the depth of water saturated sand; and the coarseness of the water-saturated sand.
  • the depth of water saturated sand may be determined by calculating the difference between the depth of the water table and the depth of an impermeable layer underneath.
  • the respective depths of the water table and impermeable layer may be determined using a metal rod as hereinafter described.
  • the depth of the water saturated sand may be between about 2 and 4 meters. More preferably the depth of the water saturated sand may be about 4 meters.
  • the method may include displacing at least some of the excavated material to the peripheral space to at least partially fill the space.
  • the initial well hole may be substantially round cylindrical.
  • the peripheral space defined in the initial well hole around the first well wall segment may be between 0.65m and 0.95m, for accommodating workers constructing the well.
  • the height of the first well wall segment may be between 75% and 125% of the diameter of the initial well hole.
  • the depth of the initial well hole may typically be such that the bottom of the hole is at a desired distance from the water table.
  • the distance between the bottom of the initial well hole and the water table may be selected such that the sand at the bottom of the initial well hole is damp with water, but not fully waterlogged, thereby providing a firm surface for constructing the first well wall segment.
  • the depth may also be selected to facilitate determining the depth of the impermeable layers and the depth to which water may be found.
  • the bottom of the initial well hole is at a level between 100mm and 200mm above a water table.
  • the method may include, after excavating the initial well hole, determining the depth of a water table and a water impermeable layer underneath by probing into the bottom of the initial well hole with a long rod and taking measurements on the rod.
  • the method may include reinforcing the well wall by placing external reinforcement around the well wall segments.
  • the reinforcement may include at least one of steel wire and steel wire netting.
  • the reinforcement may include a layer of rendering material.
  • the rendering material may have a 4:1 sandxement mix.
  • the peripheral space defined in the initial well hole around the first well wall segment may assist in applying the reinforcement to the well wall by allowing access to the outer side of the well wall. The reinforcement may thus be applied incrementally, particularly to each well wall segment whilst it is positioned in the initial well hole.
  • the method may include pumping out water seeping into the well hole so as to facilitate further excavation. It is expected that the pumping rate should be faster than the required yield of the well.
  • the further excavation of the hole may be ceased at any desired depth.
  • Preferably excavation may be ceased when the depth of the water flowing into the well inhibits effective excavation of the hole. More preferably excavation may be ceased when the depth of the water flowing into the well is 1 meter from the bottom of the hole whilst water is being pumped from the hole. In any event excavation should be ceased about 0.5 meters before the impermeable layer is reached.
  • the frusto-conical well wall segments may be manually constructed in situ from construction elements.
  • the construction elements may be bricks or other building blocks secured together by means of mortar.
  • the frusto-conical well wall segments may be pre-fabricated units.
  • the pre-fabricated units may be configured to interconnect and/or interlock, thereby to define the frusto-conical well wall.
  • the pre-fabricated units may be made of any suitable material, for example concrete, steel plate, plastic, or fiberglass.
  • the frusto-conical well wall segments may be units, each unit comprising a pre-fabricated mould and a fill material introduced into the mould after placement of the mould in the well hole.
  • the mould may be made of fiberglass.
  • the fill material may be a settable cementitious material. It is envisaged that the mould will be filled with fill material after each well wall segment has been placed in position.
  • a bottom edge of the first well wall segment may be chisel-shaped in cross-section, thereby defining a cutting edge.
  • the cutting edge may be on the outer diameter of the bottom end of the first well wall segment.
  • the method may include extending the well wall up to a level above ground level by providing at least one more well wall segment on top of the previous ones.
  • the level above ground level may be between 0.4m and 1.Om above ground level.
  • the level above ground level may be determined by the typical depth of water which may envelop the well during floods. Extending the well wall to a level above such a depth may therefore prevent floodwater from entering the well.
  • the well wall may be at least partially constructed of water permeable concrete thereby to permit passage of water through the wall.
  • the elements may be water permeable.
  • Such building elements may be cast with a no-fines concrete. More particularly, the building elements may be cast with a 5 to 1 mixture of a 10 to 18 mm aggregate, the mixture being dampened before compaction.
  • Such building elements will have a porous structure. If the wall is partially constructed of such building elements, these building elements may be interspersed between other, non-porous building elements. In such a case rendering will, at least, not be applied on the outside surface of the porous building elements.
  • a well including a frusto- conical well wall comprising a vertically stacked arrangement of frusto-conical well wall segments. Further features of the well of the third aspect of the invention may be analogous to features of the well constructed in accordance with the method of the first aspect of the invention, as described above.
  • Figure 1 shows a longitudinal section of a well hole having a first well wall segment provided therein;
  • Figure 2 shows a longitudinal section of the well hole of Figure 1 , the hole having been further excavated and a second well wall segment having been added to the first well wall segment;
  • Figure 3 shows a longitudinal section of a complete frusto-conical well wall which has been constructed in accordance with the invention
  • Figure 4 shows suitable sites for constructing a frusto-conical well in a sandy river terrain
  • Figure 5 shows suitable sites for constructing a frusto-conical well in wetlands or an area having permanently waterlogged ground
  • Figure 6 shows the construction of a frusto-conical well in a swamp area
  • Figure 7 shows a three dimensional view of a vertical section of a frusto-conical well wall segment
  • Figure 8 shows a long section of a first well wall segment of a well in accordance with the invention
  • Figure 9 shows a long section of an alternative well wall segment of a well in accordance with the invention.
  • Figure 10 shows a long section of another alternative well wall segment of a well wall in accordance with the invention.
  • reference numeral 10 generally indicates an area which has been selected as suitable for the construction of a well, the area 10 having a water table 40 a depth 40.1 below the ground surface 42. Waterlogged sand 44 is found to a depth 44.1 beneath the level of the water table 40 and an impermeable layer 46 of clay (or sand) is found at a depth 46.1 from the surface 42.
  • the area has an initial well hole 12 excavated therein, the hole 12 having a sidewall 14, a diameter 12.1 and a depth 12.2 from the ground surface 42. In the embodiment shown in Figure 1 the hole 12 has been excavated to a depth 12.2 so that the bottom 48 of the hole 12 is 150mm from the level of the water table 40.
  • a frusto-conical first well wall segment 16, having an open top 18 and bottom 20, has been constructed in the bottom 48 of the hole 12, the first well wall segment 16 having been constructed of a plurality of building elements 16.1.
  • a number of the building elements 16.1 may be porous building elements 102 manufactured of a no-fines concrete.
  • the bottom 20 of the first well wall segment has an outer diameter 20.1 , the diameter 20.1 of the bottom of the first well wall segment 16 being smaller than the diameter 12.1 of the hole 12, thus defining a peripheral space 24 between the sidewall 14 of the hole 12 and a peripheral outer surface 22 of the first well wall segment 16.
  • a bottom edge 50 of the first well wall segment 16 is chisel-shaped so as to facilitate the sinking of the first well wall segment 16 as the hole 12 is deepened.
  • reference numeral 10 generally indicates the same area as represented in Figure 1.
  • the hole 12 has been further excavated to a depth 12.3 below the surface 42 by excavating material 30 from the bottom 52 of the hole 12 on the inside of the first well wall segment 16, the first well wall segment 16 now having been sunk past the water table 40 and into the waterlogged sand 44.
  • a second well wall segment 30 has been constructed from building elements 26.1 on top of the first well wall segment 16.
  • Excavated material 26 has been displaced to the space 24 between the sidewall 14 of the hole 12 and the peripheral outer surface 22 of the first well wall segment 16, the space 24 having been further defined by a peripheral outer surface 54 of the second well wall segment 26.
  • the process of further excavating the inside of the well wall, displacing excavated material 26 to the space 24 and constructing further well wall segments on top of an existing well wall segment, or combination of well wall segments, is continued until the well is at a desired depth and the well wall extends to the ground surface 42.
  • reference numeral 60 generally indicates a completed frusto-conical well which has been constructed in accordance with the method of the invention.
  • the well 60 is in the area 10 as represented in Figures 1 and 2.
  • Further well wall segments 62 have been added to the combination of the first and second well wall segments 16, 26.
  • the frusto-conical well 60 thus comprises a stacked arrangement of frusto-conical well wall segments 16, 26, 62, all of which have been constructed from building elements 62.1.
  • the frusto-conical well 60 has an open top 64 and bottom 66 thereby to allow water to enter at the bottom 66 of the well 60 and be withdrawn from the top 64 of the well 60.
  • the well wall segment further comprises a number of porous building elements 102, shown in this embodiment only in the first well wall segment.
  • the well 60 has been sunk to a depth where the bottom 66 of the well 60 is within 0.5 meters of the impermeable layer 46.
  • reference numeral 400 generally indicates suitable sites for constructing a frusto-conical well in a sandy river terrain 402.
  • the terrain 402 has attributes typically associated with a sandy river, including an impermeable layer 404, a dry season water table 406, a flood season flood level 408, waterlogged sand or gravel 410 and river banks 412 of alluvial soil.
  • an irrigation frusto- conical well 414 is typically constructed in the bed 416 of the river 402 by the method of the invention, a bottom of the irrigation well 414 extending past the dry season water table 406, into the waterlogged sand 410.
  • the irrigation well 410 may provide irrigation water to surrounding agricultural applications.
  • a domestic frusto-conical well 418 may be constructed on the banks 412 of the sandy river to provide water for domestic purposes during dry and wet seasons.
  • the domestic well 418 also extends past the dry season water table 406, into the waterlogged sand 410.
  • the domestic well 416 further extends to a sufficient level above ground level and above the typical flood level 408, so that during floods, when the water level of the river rises to the flood level 408, water will be prevented from entering the well 416.
  • the domestic frusto- conical well 418 may also include a watertight cover which prevents water and other material from entering the well 418 during floods.
  • reference numeral 500 generally indicates first and second frusto-conical wells 512, 514 which have been constructed in wetlands or an area having permanently waterlogged ground.
  • the area has attributes typically associated with wetlands or areas having permanently waterlogged ground, including a water table 502 which is located relatively shallow beneath the ground surface and results in the ground beneath the water table 502 being permanently waterlogged.
  • the area further includes a layer of alluvial soil 504, a layer of alluvial sand and/or silt and/or gravel 506 below the layer of alluvial soil 504, an impermeable layer of rock or clay 508 and a replenishment water flow 510 beneath the surface.
  • the first and second frusto-conical wells 512, 514 represent possible locations at which frusto-conical wells may be constructed.
  • the first frusto-conical well 512 represents the outermost position where a frusto-conical well may be installed. This is due to the fact that, should the first frusto-conical well 512 be constructed higher up against the inclined section 516, the replenishment water flow 510 will flow past the first frusto-conical well 512 and the yield of the first frusto-conical well 512 will be less than optimal.
  • the most preferable position for constructing a frusto-conical well in a wetlands area is a position selected in a section of the area having a generally flat profile. Such a preferable position is exemplified by the second frusto-conical well 514.
  • reference numeral 600 generally indicates construction of a frusto-conical well in a swamp area.
  • a first well wall segment 602 is positioned on a mud layer 604 of the area, thereby enclosing a volume of swamp water 606.
  • the first well wall segment 602 is typically positioned on the mud layer 604 by a crane 608 which is provided on a boat 610. Alternatively, the crane 608 may also be provided on a bank of the swamp area.
  • water enclosed therein is pumped out and excavating is commenced inside the first well wall segment 602 by the method of the invention, thereby to sink the first well wall segment 602 into the mud layer 604.
  • reference numeral 700 generally indicates a three dimensional view of a vertical section of a well wall segment of a frusto-conical well.
  • the well wall segment 700 is constructed of building elements 702 and has an inner surface 704 and an outer surface 706.
  • a layer of 14 to 16 gauge reinforcing steel netting wire 708 is applied to the outer surface 706 of the well wall segment. Further securing well wall segments of steel wire 710 are applied over the reinforcing steel netting wire 708 to keep it in place.
  • plaster 712 is applied over the reinforcing steel netting wire 708 layer and the securing well wall segments of steel wire 710.
  • plaster has only been applied to a portion of the outer surface 706 of the well wall segment 700.
  • plaster will have been applied to the full outer surface 706, covering substantially all of the netting wire 708 and securing wire 710, except for a slim portion of netting wire 714 at a top end of the well wall segment 700 which will be left bare and over which plaster will not be applied.
  • reference numeral 800 generally indicates a first well wall segment in accordance with the invention. A layer of reinforcing plaster 802 has been applied to an outer surface of the well wall segment 800.
  • a lower edge 804 of the well wall segment is chisel-shaped, having a straight outer side and a slanted inner side.
  • the chisel-shape of the edge 804 facilitates the sinking of the well wall segment into the ground, and also facilitates the excavation of material from below the edge 804, as excavation tools and implements may be inserted into the ground at an angle along the edge 804. In this embodiment the angle at which the edge 804 is slanted is 45°.
  • a number of porous building elements 806 have further been included in the well wall segment 800.
  • the porous building elements 806 are manufactured with a no-fines concrete comprising a 5 to 1 mixture of a 10 to 18 mm aggregate, the mixture being dampened before compaction.
  • porous building elements are dispersed in the well wall segment 800 such that every second building element of every second row of building elements is a porous building element 806.
  • an alternative frusto-conical well wall segment of a well in accordance with the invention is designated by the reference numeral 900.
  • the well wall segment 900 is a pre-fabricated or pre-cast concrete unit. It has a top peripheral interconnection or interlock formation in the form of a peripheral rim 902 for engaging a complementary formation of a matching well wall segment (not show) to be placed on top of the well wall segment 900. It has a similar bottom peripheral rim 904 which can engage a complementary formation of a matching well wall segment (not show) below the well wall segment 900.
  • Alternative well wall segments may be pre-fabricated units of another suitable material, for example steel, plastics, or fiberglass.
  • FIG 10 another alternative frusto-conical well wall segment of a well in accordance with the invention is designated by the reference numeral 910.
  • the well wall segment 910 comprises a mould 912 and fill material in the form of concrete 914 filled into the mould after placement of the mould in a well hole.
  • the mould may be of any suitable material, for example fiberglass or plastics.
  • the mould has engagement formations 902 and 904 similar to those of the well wall segment 900 of Figure 9, as described above.
  • One advantage of the invention lies therein that the frusto-conical shape of the well wall enables the well wall to sink by itself as material is excavated from the bottom of the hole, inside the well wall, in which the well wall, or a portion or well wall segment of the well wall, has been provided.
  • the chisel-shape of the bottom edge of the first well wall segment, and thus the bottom edge of the well wall, further assists in facilitating the sinking of the well wall.
  • the Applicant expects that the frusto-conical shape of the well wall will provide an advantage over a cylindrical well wall in respect of the process of sinking the well.
  • the frusto-conical shape of the well further typically has a larger storage capacity to effect than a cylindrical well.
  • the frusto-conical well will typically have a larger volume than the tubular well and will also have a higher inflow of water at the bottom of the well.
  • a further advantage of the invention is that, by excavating inside a section having a completed well wall and displacing excavated material to the space between the inner peripheral surface defined around the hole and the peripheral outer edge of the well wall or well wall segment, and progressively adding/constructing further well wall 5 segments whilst the hole is deepened, the danger of the sidewall of the well hole caving in on diggers, excavating the hole, is decreased as the diggers are continually protected by the existing portion of the well wall.
  • Another advantage of the invention is that, as the diameter of a lower end of the well 0 is larger than the diameter of a top end of the well, water will seep into the well very slowly at the bottom and will rise faster as the diameter of the well decreases from bottom to top. Consequently, due to the specific gravity of sand being higher than the specific gravity of water and due to the initial slow rising speed of the water, most of the sand in the water seeping in at the bottom of the well will precipitate at a base of 5 the well and will not be carried upwards with the water. Thus, it is expected that water rising into the well will contain virtually no sand. By positioning a water extraction pipe inside the well such that its inlet opening is at the highest possible water level at which water may be continuously withdrawn, it is therefore possible to extract virtually sand- free water from the well. >0
  • Yet another advantage of the invention is that the water in the well is, at least with regard to macro-contaminants, kept relatively safe for human consumption as the well cover prevents contaminated floodwater, as well as other contaminants which may enter the well (such as insects), from entering the well.
  • Yet another advantage of the invention is that it may be effectively employed in swamp areas.
  • waterlogged sand containing groundwater which may be safe for human consumption may be found beneath a mud-layer which prevents contaminated swamp-water from infiltrating into the sand layer below the mud layer.
  • An initial well wall element in accordance with the invention, may be erected on the mud-layer of the swamp, thereby closing a small volume of swamp-water off from a main volume of swamp water.
  • the small volume of swamp water may subsequently be removed from within the initial well wall segment, for example by pumping, and the well may be sunk past the mud-layer into the waterlogged sand layer in accordance with the method of the invention as hereinbefore described.
  • the initial well wall segment may be a prefabricated well wall segment which may be positioned in the swamp, for example by use of a crane.
  • the crane may be on a bank of the swamp, or may be on a boat which sails into the swamp to position the initial well wall segment in a desired and/or suitable position.
  • the Applicant further envisages that the well of the invention may aid in providing pure, potable groundwater in areas where existing wells provide contaminated water.
  • the Applicant expects that the use of water from wells of the invention will reduce the number of incidents of disease in undeveloped countries where waterbome diseases are prevalent.
  • the well of the invention will be a suitable substitute for a borehole in areas where saltwater or brackish water is found at deeper levels.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Piles And Underground Anchors (AREA)
  • Bulkheads Adapted To Foundation Construction (AREA)

Abstract

L'invention porte sur un procédé de construction d'un puits. Le procédé comprend l'excavation d'un trou de puits initial d'une profondeur qui représente une fraction de la profondeur finale du puits, la disposition d'un premier segment de paroi de puits tronconique dans le trou de puits initial, l'excavation du trou de puits plus profondément à partir de l'intérieur du premier segment de paroi de puits, permettant ainsi au premier segment de paroi de puits de s'enfoncer plus profondément, et l'empilement de segments de paroi de puits tronconiques supplémentaires les uns sur les autres à mesure que le trou de puits est approfondi. Le procédé est poursuivi jusqu'à ce que le premier segment de paroi de puits tronconique se trouve à une profondeur souhaitée et que la paroi de puits tronconique s'étende jusqu'au niveau du sol. Le procédé s'étend également à un puits construit selon l'invention, le procédé comprenant une paroi de puits tronconique comprenant un agencement empilé de segments de paroi de puits tronconiques.
PCT/AP2009/000001 2008-05-12 2009-03-25 Puits et procédé de construction d'un puits Ceased WO2009137848A2 (fr)

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ZA2008/04046 2008-05-12
ZA200804046 2008-05-12

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WO2009137848A2 true WO2009137848A2 (fr) 2009-11-19
WO2009137848A3 WO2009137848A3 (fr) 2010-01-28

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ES2355673A1 (es) * 2010-10-14 2011-03-30 Fundacion Accion Contra El Hambre Estructura ligera para pozos de agua.
WO2014016444A1 (fr) * 2012-07-25 2014-01-30 Euroestudios S.L. Pièce d'insertion
CN108396780A (zh) * 2018-05-04 2018-08-14 福建鸿生高科环保科技有限公司 一种既有检查井改建方法
WO2020001798A1 (fr) * 2018-06-26 2020-01-02 Slipform Engineering Ltd Structure en béton à coffrage glissant et procédé de coffrage glissant
CN110847237A (zh) * 2019-11-22 2020-02-28 河北瑞池工程项目管理有限公司 一种检查井防沉降结构及其施工方法
CN110952619A (zh) * 2019-12-23 2020-04-03 宁夏水投科技股份有限公司 一种新型八角井
CN116716948A (zh) * 2023-07-22 2023-09-08 中电建十一局工程有限公司 一种预制装配式大口井及施工方法

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US3462896A (en) * 1967-11-13 1969-08-26 Otto M Lokensgaard Apparatus for installing septic tanks and cesspools
DE4122299C2 (de) * 1991-07-05 1996-05-23 Bernhard Kessel Schacht
US5727901A (en) * 1996-01-18 1998-03-17 Rennie; David G. Collection tank
AT500139B8 (de) * 2004-02-20 2007-02-15 Guggemos Horst Ringelement

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