This application claims the benefit of priority to an Iran patent application having Ser. No. 139350140003013533, filed on Mar. 4, 2015, which subsequently issued as Iran patent number 86823 on Sep. 30, 2015, the entire content of which is incorporated by reference herein.
The present application relates generally to providing water drainage wells and, more particularly, to providing temporary water drainage wells to drain water from loose granular soil at construction sites such that the drainage wells can be easily installed while preventing slippage and collapsing of the soil.
Construction projects typically require drainage and removal of groundwater at the construction site prior to excavation. Groundwater drainage is typically via installing drainage wells in various locations within the construction site and pumping the drained groundwater out from the wells. However, installation of drainage wells, especially in loose granular soils, can be a challenging process. This is because loose granular soils are unstable and there is a high possibility of soil slippage and loss of soil mass during the drainage process.
Currently known techniques for installing drainage well pipes have multiple disadvantages such as, for example, limited depth of the wells, need for considerably massive excavation, soil slippage, requiring high volumes of aggregate material for protection of well walls, slow installation process, high cost, and need for removal of soil inside the well when casing pipes are used. In cases where the soil inside the drainage well is removed while removing the groundwater, piping phenomenon may occur which may cause the soil beneath the well to sink.
Hence, a need exists for providing temporary water drainage wells to drain water from loose granular soil at construction sites such that the drainage wells can be easily installed while preventing slippage and collapsing of the soil.
In one general aspect, the instant application describes a method for building a drainage well in a loose granular soil. The method includes steps of inserting a liner tube into a loose soil using an inserting device, the liner tube including a housing and an internal shaft placed inside the housing and coupled to inside the housing via a locking mechanism; unlocking the internal shaft from the housing and removing the unlocked internal shaft from the housing subsequent to inserting the liner tube into the loose soil; and inserting via an inserting device a grooved pipe inside the housing from which the internal shaft has been removed. The grooved pipe is longer than the housing and is configured to receive groundwater via a plurality of grooves within the grooved pipe. The method further includes steps of removing via a mechanical excavator the housing from the loose granular soil subsequent to insertion of the grooved pipe inside the housing and filling a space between the loose granular soil and the grooved pipe with a filling material.
The above general aspect may include one or more of the following features. The inserting device may include a mechanical hammer for hammering the liner tube into the loose granular soil. The liner tube may include a cone shaped end. The method may further include steps of inserting a drainage pipe inside the grooved pipe and connecting the drainage pipe to a pump to remove the groundwater penetrated inside the grooved pipe.
Removing the unlocked internal shaft may include removing the unlocked internal shaft using the mechanical excavator. The inserting device may include a hydraulic hammer, a mechanical auger, or a compressed air hammer. The cone shaped end of the liner tube is part of the internal shaft and is configured to facilitate penetration of the liner tube into the loose soil. The filling material may include sand. The method may further include filling up to 50 centimeters from bottom of the grooved pipe with sand to stabilize the grooved pipe inside the liner tube.
The drainage well may be about 7 meters deep and about 50 centimeters wide. The top part and a bottom part of the liner tube may be covered with hard steel plates to increase the liner tube strength. Inserting the liner tube in the soil may be performed without soil removal, and wherein the liner tube may compress the loose soil when entering the soil. The compressed soil around the liner tube may prevent occurrence of piping phenomena. The inserting device may include a mechanical hammer, and inserting the line tube may include inserting the line tube into the soil using a flat disk attached to the mechanical hammer. The liner tube may be connected to the mechanical hammer via steel cables. The grooved pipe may be made from hard plastic, hard polymer, polyethylene, polyvinyl chloride (PVC), or hard un-plasticized polyvinyl chloride (UPVC). The method may further include a step of wrapping the grooved pipe with a geotextile layer configured to protect the grooved pipe and filter the groundwater penetrating the grooved pipe.
In another general aspect, the instant application describes another method for draining groundwater from an area having loose granular soil. This method includes steps of creating a plurality of drainage wells in the area of the loose granular soil. The drainage wells may have a predefined distance from each other and creating each drainage well may include hammering a liner tube with a cone shaped end into the loose soil using a mechanical hammer. The liner tube may include a housing and an internal shaft placed inside the housing and fixed to the housing using a locking mechanism. Creating each drainage well may further include steps of unlocking the internal shaft from the housing and removing the unlocked internal shaft from inside the housing subsequent to hammering the liner tube into the loose soil. Creating each drainage well may further include a step of inserting a grooved pipe inside the housing by hammering the grooved pipe using the mechanical hammer. The grooved pipe is longer than the housing and is configured to receive groundwater via a plurality of grooves within the grooved pipe. Creating each drainage well may further include steps of filling bottom of the grooved pipe with sand to stabilize the grooved pipe inside the housing; removing the housing from the loose granular soil using a mechanical excavator, and filling a space created by the removing of the housing with a filling material. The method may further include steps of inserting a drainage pipe inside the grooved pipe of each drainage well from the plurality of drainage wells; and connecting the drainage pipes from the plurality of drainage wells to a pump configured to remove the groundwater penetrated inside the grooved pipes of the plurality of drainage wells.
The above general aspect may include one or more of the following features. For example, removing of the unlocked internal shaft may be performed using the mechanical excavator. The mechanical hammer may be a hydraulic hammer. The cone shaped end of the liner tube may be connected to the internal shaft. The hammering the liner tube in the soil may be performed without soil removal. The liner tube may compress the loose soil when entering the soil. The liner tube may be connected to the mechanical hammer via steel cables.
Features of the subject technology are set forth in the appended claims. However, for purpose of explanation, several implementations of the subject technology are set forth in the following figures.
In the following detailed description, numerous specific details are set forth by way of examples in order to provide a thorough understanding of the relevant teachings. However, it should be apparent to those skilled in the art that the present teachings may be practiced without such details. In other instances, well known methods, procedures, components, and/or equipment have been described at a relatively high-level, without detail, in order to avoid unnecessarily obscuring aspects of the present teachings.
Since ancient times human beings have been trying to access groundwater (e.g., water present beneath earth's surface in soil pore spaces and in the fractures of rock formations) and find ways to construct building structures at or under the groundwater level. Various technologies have been developed for drilling drainage wells for extracting groundwater. Today, with advances in technology and the use of advanced equipment, drilling in difficult circumstances is possible. However, parameters such as technical, economic, environmental, speed and time, availability of equipment, have crucial effects on groundwater drainage process. In practice, drilling in hard soil formations is easier than drilling in loose soil formations, especially in the groundwater level. In loose granular soils saturated with water, drilling without using liner tubes or Bentonite mud is not possible. However, the use of bentonite mud in drainage wells is not customary due to significant reduction in permeability of the wall and bottom of the drainage well.
In development projects and urban construction, especially in areas with high levels of groundwater, traditional drainage methods are not effective. Some of the techniques currently used in constructing drainage wells in loose and saturated soil formations include, manual drilling, using excavators, using bucket type or screw type mechanical augers without installing liner tubes such that the soil is repeatedly removed, installing liner tubes and removing the soil inside the liner tube using a crew or bucket mechanical auger.
The traditional method of manual drilling is limited, especially in loose granular soils. In this method the depth of the drainage well cannot be deeper than the groundwater level and water drainage is hard. In some cases, the soil can be removed using excavators and cement, plastic, or metal grid liner pipes can be installed in the excavated area. However, this method is not suitable for areas with loose soil where the groundwater level is high. This is because a high volume of wet soil needs to be removed, a high volume of sand needs to be used to stabilize the liner pipes, and slippage and sinking of the soil around the liner pipe may occur that can damage the nearby buildings and structures.
The use of bucket type or screw type mechanical augers without installing liner tubes, for drilling drainage wells may need excavation of large pits in the ground. In addition, removal of the auger may cause soil slippage and a high volume of soil may be slipped in the excavation pit that should be removed. As a result deep drainage may not be possible. In addition piping phenomena may occur at the bottom of the drainage well. The piping phenomena includes occurrence of erosion and flooding that may damage the soil and the structures in the ground.
The installation of liner tubes in the soil and removing the soil inside the liner tube using a screw or bucket mechanical auger, may have disadvantages. For example, due to looseness of the soil around the liner tube, removal of loose and wet soil from inside the liner tube by using an auger can be very difficult because the liner may slip in the loose soil and move with the movements of the auger. In addition, the piping phenomena may occur at the bottom of the liner tubes. Since the soil inside the liner tubes need to be removed, and groundwater may enter the liner tubes with a high speed, the excavation and installation of drainage wells has to be performed with a high speed. Therefore, method and equipment are needed for installation of drainage wells in loose granular soils such that the disadvantages of the current methods can be resolved.
Reference now is made in detail to the examples illustrated in the accompanying drawings and discussed below.
The poundings of the hydraulic hammer 123 can be transferred to the liner tube 121 by a shaft 401 (shown in
The internal shaft 125 can have a cone shaped end enabling the liner tube 121 to be easily hammered down in the soil. The internal shaft 125 can be locked inside the liner tube 121 to prevent it from slipping. At step 103, the internal shaft 125 can be unlocked and removed from inside of the liner tube 121.
At step 105a, a grooved pipe 127 is inserted inside the liner tube 121. The groove pipe 127 can provide a drainage well for removing the groundwater. The grooved pipe 127 can be made from hard plastic or hard polymer, for example, polyethylene, polyvinyl chloride (PVC), hard un-plasticized polyvinyl chloride (UPVC), or similar material. The grooved pipe 127 can be wrapped with a layer of geotextile (e.g., permeable fabric which, when used in association with soil, has the ability to separate, filter, reinforce, protect, or drain). The geotextile layer can filter groundwater that penetrates into the grooved pipe. As a result occurrence of piping phenomena which includes removal of soil while removing the groundwater can be prevented.
The grooved pipe 127 can have a diameter such that upon wrapping the grooved pipe 127 with the geotextile layer, the total diameter of the grooved pipe 127 is smaller than the inner diameter of the liner tube 121. As shown in step 105b, the geotextile wrapped grooved pipe 127 can be installed inside the liner tube 121.
At step 107, the bottom of grooved pipe 127 is filled with sand to stabilize the grooved pipe 127. For example, the grooved pipe 127 can be filled for around 50 centimeters from the bottom (shown as 129 in
At step 109, the liner tube 121 can be removed from the ground, for example, by a mechanical excavator 301, as shown in
A cylinder 1306 can be attached to the other end 1307 of the internal shaft 125. The other end 1307 may be a solid part of the internal shaft 125 made from steel and may configured to engage with the cylinder 1306 via a screwing mechanism although other form of engagements are contemplated. The cylinder 1306 may be configured to facilitate load transfer between the liner tube 121 wall and the internal shaft 125. The outer surface of the cylinder 1306 may be covered by the rings 1308 to enable coupling between the internal shaft 125 and the outer wall 1305. Alternatively, the rings 1308 may enable coupling between the internal shaft 125 and the mechanical excavator. To this end, hardening components 1309 similar to steel rims 1302 made from steel plates can be installed around the top part of the liner tube 121. The hardening components 1309 may be configured to protect the liner tube 121 from being damaged due to connection between the mechanical excavator and the internal shaft 125 and hammering and to facilitate removal of the internal shaft 125 from the liner tube 121. Component 1310 is a flat pounding head connected to a hydraulic hammer 123 for transferring the force from the hydraulic hammer 123 to the liner tube 121 and the internal shaft 125. The short steel shaft 1311 connects the hydraulic hammer 123 to the flat pounding head 1310 and transfers the force from the hydraulic hammer to the flat head.
The disclosed method provides various advantages such as, for example, lowering groundwater level in the excavation area having loose granular and collapsible formation through a network of temporary drainage wells; construction of drainage wells in loose granular and collapsible soil by using a shuttle system (e.g., liner tubes with internal shafts) without drilling, removing and transportation of soil; protection of the environment and the workplace; possibility of preforming the groundwater removal with high speed and quality and low cost; taking advantages of the drainage system (the network of drainage wells) for excavation areas in loose granular and collapsible formations to a depth of 7 meters; maintaining safety of upstream areas and preventing damage to adjacent buildings; and not needing large amounts of drainage materials around the drainage wells. The diameter of each drainage well can be around 50 centimeters.
The disclosed method for installation of drainage wells can be used in building sites prior to excavation. For example, for buildings that include underground structures, the disclosed method can be used for removing the ground water or building a sewage system. The method can also be used for sewage drainage ponds and pumping sewage water. The method can also be used in building liquid storage tanks, building roads and related structures and various other construction projects. The method can also be used in farmlands for irrigation purposes.
While the foregoing has described what are considered to be the best mode and/or other examples of providing temporary drainage wells for loose granular soils, it is understood that various modifications may be made therein and that the subject matter disclosed herein may be implemented in various forms and examples, and that the teachings may be applied in numerous applications, only some of which have been described herein. It is intended by the following claims to claim any and all applications, modifications and variations that fall within the true scope of the present teachings.
Unless otherwise stated, all measurements, values, ratings, positions, magnitudes, sizes, and other specifications that are set forth in this specification, including in the claims that follow, are approximate, not exact. They are intended to have a reasonable range that is consistent with the functions to which they relate and with what is customary in the art to which they pertain.
The scope of protection is limited solely by the claims that now follow. That scope is intended and should be interpreted to be as broad as is consistent with the ordinary meaning of the language that is used in the claims when interpreted in light of this specification and the prosecution history that follows and to encompass all structural and functional equivalents. Notwithstanding, none of the claims are intended to embrace subject matter that fails to satisfy the requirement of Sections 101, 102, or 103 of the Patent Act, nor should they be interpreted in such a way. Any unintended embracement of such subject matter is hereby disclaimed.
Except as stated immediately above, nothing that has been stated or illustrated is intended or should be interpreted to cause a dedication of any component, step, feature, object, benefit, advantage, or equivalent to the public, regardless of whether it is or is not recited in the claims.
It will be understood that the terms and expressions used herein have the ordinary meaning as is accorded to such terms and expressions with respect to their corresponding respective areas of inquiry and study except where specific meanings have otherwise been set forth herein. Relational terms such as first and second and the like may be used solely to distinguish one entity or action from another without necessarily requiring or implying any actual such relationship or order between such entities or actions. The terms “comprises,” “comprising,” or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by “a” or “a” does not, without further constraints, preclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.
The Abstract of the Disclosure is provided to allow the reader to quickly ascertain the nature of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. In addition, in the foregoing Detailed Description, it can be seen that various features are grouped together in various examples for the purpose of streamlining the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the claims require more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive subject matter lies in less than all features of a single disclosed example. Thus the following claims are hereby incorporated into the Detailed Description, with each claim standing on its own as a separately claimed subject matter.
Number | Date | Country | Kind |
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139350140003013533 | Mar 2015 | IR | national |
Number | Name | Date | Kind |
---|---|---|---|
191876 | Mesler | Jun 1877 | A |
790910 | McClintock | May 1905 | A |
951668 | Welsh | Mar 1910 | A |
2326155 | McCook | Aug 1943 | A |
2636355 | Thornley | Apr 1953 | A |
3839874 | Wyant | Oct 1974 | A |
4623025 | Verstraeten | Nov 1986 | A |
4934865 | Varkonyi | Jun 1990 | A |
Number | Date | Country |
---|---|---|
101250879 | Aug 2008 | CN |
101627675 | Jan 2010 | CN |
56-81719 | Jul 1981 | JP |
61113920 | May 1986 | JP |
Number | Date | Country | |
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20160186398 A1 | Jun 2016 | US |