CN110293109B - Construction method of landfill gas guide and drainage gas collecting well - Google Patents
Construction method of landfill gas guide and drainage gas collecting well Download PDFInfo
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- CN110293109B CN110293109B CN201910567140.XA CN201910567140A CN110293109B CN 110293109 B CN110293109 B CN 110293109B CN 201910567140 A CN201910567140 A CN 201910567140A CN 110293109 B CN110293109 B CN 110293109B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B1/00—Dumping solid waste
- B09B1/006—Shafts or wells in waste dumps
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- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/30—Landfill technologies aiming to mitigate methane emissions
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- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a construction method of a landfill gas guide and drainage gas collecting well, which comprises the following steps: 1) the front guide cone is used as a feeding head at the selected position of the garbage pile body, pressure is applied to the pressure-bearing surface, and the technical hole-opening part is gradually pressed into the garbage pile body until a first length is remained outside the garbage pile body; 2) applying a pulling force to the reverse pushing surface, and pulling the technical hole opening component out of the garbage pile body to form a base hole, wherein the direction of the pulling force is opposite to that of the pressure; 3) putting the well pipe into the base hole until the head cone is contacted with the bottom of the base hole, applying pressure to the flange, pressing the well pipe into the garbage pile body until the second length of the well pipe is remained outside the garbage pile body, and leaving a filling space between the well pipe and the base hole; 4) filling broken stones into the filling space to a position which is a given distance away from the hole opening of the base hole, wherein the given distance determines a sealed space; 5) and filling soil into the sealed space and compacting. The construction method of the invention is easy to ensure the construction quality and the well pipe is easy to recover.
Description
Technical Field
The invention relates to a construction method of a landfill gas guide and drainage gas collecting well.
Background
At present, the main mode of domestic garbage treatment in China is to carry out landfill in a specified place, and almost all municipal domestic garbage adopt the landfill treatment mode. The method can be used for judging whether engineering measures are complete or not and environmental protection standards can be met, and the refuse landfill area can be divided into a simple landfill, a controlled landfill and a sanitary landfill. The landfill sites capable of performing landfill gas collection are mainly the latter two types of landfill sites.
The landfill can form a larger garbage pile body, and the household garbage in the garbage pile body can be rotten and fermented to generate a large amount of gas due to more organic components, and the gas is collectively called as landfill gas. The landfill gas has a certain rule, and the landfill gas can be treated and used by digging a gas collecting well on the garbage heap body to collect the landfill gas according to the rule. The effective component in the landfill gas which can be utilized is methane which can be used as a fuel gas source.
A simple gas pumping well construction process and safety precaution measures for landfill gas in a current common pumping well (namely a gas collecting well) are systematically discussed in a paper carried in construction and engineering (25 th 2011), section 2.1.2 discloses a tubular pile construction method, the tubular pile construction method is a soil extrusion construction process, the used tubular pile is provided with a pile pipe and a pile tip matched with one end of the pile pipe, the pile tip is approximately of a head cone structure, and the diameter of the bottom surface of the head cone structure is larger than that of the pile pipe. The pipe pile construction process includes the steps of firstly, using a pipe pile to form a hole, specifically, using a pile tip to be located at the lower part and a pile pipe to be located at the upper part, using a pile driving machine to drive the pile pipe to a designed depth based on extrusion and guiding of a pile head, and enabling the pile tip to be driven into a garbage pile body, wherein the pile pipe is partially exposed out of the garbage pile body. After the tubular pile is driven into the garbage pile body, the tubular pile is used as an isolation cofferdam to form an independent space in the tubular pile, and then a well pipe is installed in the tubular pile.
The main purpose of the pipe pile construction method is that the pipe pile construction process is shielded by the pile pipe, the well pipe is not in direct contact with the landfill gas when the well pipe is installed, and after the well pipe is installed in place, the pile pipe in the pipe pile can be lifted out, so that the well pipe is in contact with the garbage, and the garbage landfill gas can be collected.
The pile tip of the tubular pile used in the tubular pile construction method needs to be retained in a garbage pile body, and a certain shielding effect is provided for a well pipe below the pile tip, so that the collection of landfill gas is influenced. And the well pipe can not be recycled. Moreover, the well casing external diameter is far less than the tubular pile internal diameter, and need pack other materials in the annular space that forms between well casing and stake pipe, the construction degree of difficulty increase on the one hand, on the other hand when proposing the stake pipe, can make the filler produce the dispersion, influences the closely knit degree of packing, and needs secondary treatment. In addition, in order to reduce the influence of the shielding effect, a certain distance needs to be kept between the well pipe and the pile tip during construction, and under the condition, when the filler is filled in the annular space, the well pipe needs to be kept in a suspended state, so that the construction difficulty is further increased.
The well pipe is protected by a pile pipe, the lower pipe of the well pipe does not need to bear pressure, the well pipe mostly adopts HDPE (High Density Polyethylene) pipe with relatively low strength, the filler is mostly broken stone, and in a landfill gas collection period, along with peristaltic settlement of a garbage pile body, the well pipe is relatively compactly extruded, so that deformation and even breakage are generated, and the well pipe cannot be recycled. As mentioned above, the shape of the landfill body changes with time, and some gas collection wells may lose their function in a short time, so that the well pipes which cannot be recycled obviously cause a certain loss.
Chinese patent document CN201496070U discloses a landfill gas collection well construction device, which is substantially similar to the pipe pile structure used in the pipe pile construction method, except that the pipe pile is directly replaced by a mother pipe and an adjacent well pipe, in other words, the well pipe is put in place while the hole is formed. It should be noted that an annulus is usually formed outside the well pipe so as to conveniently throw a certain amount of broken stones, and the broken stones have the function of blocking large garbage and prevent the large garbage from blocking the air inlet. In this patent document, however, it is difficult to form a required annulus outside the well pipe with a simple conical squeeze head. Furthermore, since the bottom diameter of the conical squeeze head is larger than the diameter of the well casing, which essentially corresponds to an anchoring head, the well casing is difficult to retrieve. As previously mentioned, some gas collection wells may fail in a relatively short period of time, and unrecoverable well tubing is unnecessarily wasted.
Disclosure of Invention
In view of the above, the present invention aims to provide a construction method of a landfill gas guiding and draining gas collecting well, which is easy to ensure construction quality and recover well pipes.
According to an embodiment of the invention, a construction method of a landfill gas guide and drainage gas collecting well is provided, which is adapted with a technical open-hole component and a given well pipe;
wherein, the technical hole-forming component is provided with a hole-forming cylinder, a front guide cone positioned at one end of the hole-forming cylinder and an actuating body positioned at the other end of the hole-forming cylinder; the diameter of the bottom of the front guide cone is the same as that of the pore-forming cylinder, the actuating body is provided with a pressure-bearing surface and a reverse thrust surface, the pressure-bearing direction of the pressure-bearing surface is the direction from the actuating body to the front guide cone, and the pressure-bearing direction of the reverse thrust surface is opposite to the pressure-bearing surface;
the well pipe is provided with a pipe body with an air inlet hole, a head cone positioned at one end of the pipe body and a pipe connecting flange positioned at the other end of the pipe body; the bottom of the nose cone is the same as the outer diameter of the pipe body, the diameter of the pipe body is less than or equal to four fifths of the diameter of the pore-forming cylinder, and the length of the pipe body is more than or equal to 1.5 times of the length of the pore-forming cylinder;
the construction method of the landfill gas guide and drainage gas collecting well comprises the following steps:
1) the front guide cone is used as a feeding head at the selected position of the garbage pile body, pressure is applied to the pressure-bearing surface, and the technical hole-opening part is gradually pressed into the garbage pile body until a first length is remained outside the garbage pile body;
2) applying a pulling force to the reverse pushing surface, and pulling the technical hole opening component out of the garbage pile body to form a base hole, wherein the direction of the pulling force is opposite to that of the pressure;
3) putting the well pipe into the base hole until the head cone is contacted with the bottom of the base hole, applying pressure to the flange, pressing the well pipe into the garbage pile body until the second length of the well pipe is remained outside the garbage pile body, and leaving a filling space between the well pipe and the base hole;
4) filling broken stones into the filling space to a position which is a given distance away from the hole opening of the base hole, wherein the given distance determines a sealed space;
5) and filling soil into the sealed space and compacting.
Optionally, in the above construction method for the landfill gas drainage gas collecting well, the well pipe needs to be sealed before the well pipe is lowered in step 3).
Optionally, the well casing and the parts of the process opening member that are in contact with the respective force applying members are covered with cotton cloth to avoid sparking.
Optionally, providing a first process component having a first via;
when in hole forming, the first process component is placed at a selected position, and the process hole-forming component is led in through the first through hole to form a hole;
providing a second process part, wherein the second process part is provided with a second through hole and is positioned on the first process part, so that the second through hole and the first through hole are kept coaxial;
while lowering the pipe, positioning a second process component on the first process component, the pipe being lowered through the second via;
the first process part and the second process part are both split bodies, and the two split bodies are combined to form the second process part.
Optionally, the uniform speed is kept during the process of taking out the process perforated part, and the taking-out speed is less than or equal to 0.5 m/s.
Optionally, the surface of the process opening part is provided with an axially-oriented air relief groove.
Optionally, the well casing is sealed after being lowered in place to avoid the leakage of landfill gas.
Optionally, the length of the pipe body is 2.0-2.7 times of the length of the hole forming cylinder;
the external diameter of the pipe body is four fifths of the external diameter of the pore-forming cylinder.
Alternatively, if the landfill site to which the well pipe is applied continues to landfill, the well pipe is lifted out with the flange as a pulling head.
Optionally, the nose cone has a length of three-fifths of the length of the nose cone.
The invention provides a construction method of a landfill gas guide and discharge gas collecting well in an embodiment.A process device mainly comprises a process pore-forming part, the use method of the process pore-forming part is similar to a tubular pile construction method in principle, a garbage pile body is relatively soft, a base hole is formed by extruding the process pore-forming part in a descending process, but no pile pipe exists in the embodiment of the invention, a well casing is put down immediately after the base hole is formed, and the shape of the base hole can be kept for a certain time after the well casing is in place, so that an annular space is left between the well casing and the base hole, crushed stones are put into the annular space, and a filtering space is formed. The gravel does not fill the annulus, and a certain depth is reserved for filling, so that the opening of the annulus is sealed, and the landfill gas is led out from the well pipe. The bottom surface diameter of the conical head matched with the well pipe is equal to the outer diameter of the pipe body, so that extra restraint is not existed when the conical head is lifted upwards, and the conical head is easy to be lifted out, thereby having the precondition of being repeatedly used. Different from a pile pipe construction method or a construction method of Chinese patent document CN201496070U, the construction method based on the embodiment of the invention does not have a cone structure which needs to be independently retained in a garbage pile body, and can effectively save the cost.
In addition, the well pipe is shorter than the technical hole opening part, the diameter of the pipe body of the well pipe is smaller than that of a hole forming cylinder on the technical hole opening part, after the well pipe is put in place, the lower part of the well pipe is supported by the garbage pile body to keep a vertical state, an additional supporting structure is not needed, and therefore in the subsequent steps of filling annular holes and the like, the use of tools is reduced, construction is further simplified, and construction difficulty is reduced. The garbage pile body is provided with a natural gap, the well pipe is lowered, part of the structure of the garbage pile body is directly inserted into the garbage pile body, part of the structure and the hole wall of the foundation hole form an annular space, broken stones are filled in the annular space, the use amount of the broken stones is smaller than that of a tubular pile construction method, and the collection efficiency of landfill gas is not actually reduced under the condition of saving raw materials. In addition, the initial positioning of the lower part of the well pipe can still ensure the overall construction quality under the condition of reducing the construction difficulty.
Drawings
FIG. 1 is a schematic diagram of a process opening feature used in one embodiment.
Figure 2 is a schematic view of a well tubular structure used in one embodiment.
FIG. 3 is an exploded view of a positioning assembly used in one embodiment.
FIG. 4 is a diagram illustrating an upper assembly structure according to an embodiment.
In the figure: 1. the positioning structure comprises a front guide cone, a hole forming pipe body 2, a blind plate 3, a head cone 4, a front positioning section 5, a hole opening section 6, an air inlet hole 7, a rear section 8, a flange 9, an upper positioning plate 10, a second through hole 11, a positioning counter bore 12, a first through hole 13, a positioning cone 14 and a lower positioning plate 15.
D1. A lower assembly, D2. an upper assembly.
Detailed Description
It will be appreciated that landfill sites are often required to be treated to prevent leakage, and that after landfill, a certain thickness of plain soil is required to be filled on the surface of the formed pile to bury the landfill, to form a shelter to reduce or completely shelter landfill gas from escaping into the atmosphere. This is a specification requirement and will not be described in detail herein, and the reference to this section mainly relates to the relevant contents of the present invention, such as the plain soil layer on the surface of the garbage dump, and is suitable for the soil filling section of the present invention.
The shielding layer is also a constituent part of the garbage heap body and is a surface layer of the garbage heap body.
In an embodiment of the invention the primary process equipment is a process opening member, a first device for pressing the process opening member into the waste heap, a second device for pulling the process opening member out of the waste heap, a third device for lowering and pressing the well casing into the base hole, and other auxiliary equipment, such as equipment for filling with crushed stone. The first to third devices may be constructed as the same device or may be used based on multiplexing.
In experimental engineering construction, a loader is used as first to third devices, and teeth and tooth grooves on a loader bucket are used, wherein the teeth or the bucket can be used as devices for pressing in a process perforating component, for example, and the tooth grooves are similar to V-shaped grooves in a nail puller and can just clamp the process perforating component acting bodies, for example, so that the process perforating component can be pulled out of a garbage pile body.
The construction of 30-40 gas collecting wells can be completed by one excavator every day (according to the 8-hour work system), the efficiency is much higher than that of a pipe pile construction method, and if special process equipment for pressing or pulling is developed in the future, the efficiency is probably improved.
FIG. 1 shows a simplified structural diagram of a process tapping unit, which is DN125 (i.e., British five-inch tube, outer diameter 140 mm) galvanized steel tube, and has an overall length of 3 m. In the figure 1, the left end is provided with a front guide cone 1, and a cone head formed by bending, folding and welding a plurality of isosceles triangle teeth formed after the pipe wall is cut at the end part. The length of the front guide cone 1 is 50 cm.
A blind plate 3 is welded to the right end of fig. 1, the blind plate 3 being a circular plate in the figure with the right end face being a pressure face against which the process opening member can be pressed into the waste heap using, for example, the teeth of a loader or other pressure equipment.
The diameter of the circular plate is larger than the outer diameter of the process opening member, and the circular plate is held substantially coaxially with the hole forming tube 2 when it is welded to the right end of the hole forming tube 2 in fig. 1, so that the circular plate is formed as a blind plate 3 having a flange as shown in fig. 1, whereby the formed tube 2 can be held by the gullets, and the flange portion of the blind plate 3 is supported on the upper surfaces of the two teeth forming the gullets, whereby the process opening member can be pulled out.
For the component shown in fig. 2, it can be called a steel pipe well, and in the embodiment of the present invention, it is referred to as a well pipe, and the well pipe for experiments is made of DN100 (i.e. english system four inch pipe, outer diameter is 114 mm) galvanized steel pipe, and the total length is 6-8 meters. In fig. 2, the left end is provided with a head cone 4, the manufacturing method is the same as that of the front guide cone 1, and the length of the head cone 4 is 30 cm. The right end is provided with a flange 9 for connecting an outer-row pipeline system.
An air inlet 7 is formed at a position extending from the flange 9 to the side of the head cone 4 by two meters to form an open pore section 6, a rear section is arranged between the open pore section 6 and the flange 9, and the length of the rear section is larger than the thickness of a soil layer for burying of the refuse landfill. The aperture of the air inlet 7 is 12mm, the air inlet 7 is annularly arranged on the pipe wall of the well pipe, and the distance between the adjacent air inlet 7 is 10 cm. Two adjacent rows of air inlets 7 are staggered in the circumferential direction of the well pipe.
A front positioning section 5 is arranged between the hole opening section 6 and the head cone 4, the front positioning section is pressed into the garbage pile body, no hole is formed, and partial garbage is prevented from entering the well pipe in the process of pressing the well pipe into the garbage pile body.
It should be noted that the relevant process equipment and steel pipe well for the "experiment" described above can also be applied to actual engineering construction, and have actual engineering construction values. Also, based on the alternative, the loader as described above essentially provides teeth and troughs and a device capable of lifting the teeth and troughs, and other devices capable of providing teeth and troughs or the like produced thereby can also be applied in steel pipe well construction.
The process equipment based on the process perforated part utilizes the property that the garbage pile body is easily extruded to form a hole, and the blind plate 3 shown in figure 1 is taken as an actuating body, namely, external force application equipment directly acts on the blind plate 3.
It should be noted that, in the case of the well pipe, it should be as vertical as possible in the garbage stack body to facilitate piping, and accordingly, the process opening member may be assisted by other work equipment or by personnel at the beginning of opening, and as described above, the process opening member for experiment may have a length of 3 m itself, and once a portion enters, for example, a plain coating, the vertical state thereof is substantially maintained, and then downward pressure is applied to gradually press it into the garbage stack body.
The applied pressure is not necessarily a positive pressure and the small additional load is not sufficient to cause the process apertured member to topple.
In the initial stage of the experiment, the technological perforated part is pressed into the garbage pile body by using the shovel teeth of the loader. The main body of the technical hole-forming part shown in fig. 1 is the hole-forming pipe body 2 shown in the figure, which is a cylinder or a round pipe as a whole, but because the technical hole-forming part needs to have certain rigidity and corrosion resistance, the technical hole-forming part is manufactured by galvanized steel pipes, and the whole weight of the pipe body structure is not large under the condition that the pipe body structure meets certain rigidity, so that the operation is convenient.
During specific operation, the well opening position can be manually selected, a small pit can be excavated in advance, or the small pit can be directly formed by using the front guide cone 1 without excavating the small pit in advance.
The blank plate 3 may be a circular plate as described above, but is not limited to a circular plate, and the blank plate 3 may be restrained by the tubular hole forming member 2 using a substantially V-shaped spline as described above, and the two teeth forming the spline may support the blank plate 3 to pull out the process hole forming member. The pressure bearing face of blind plate 3 is the pressure bearing face, the right face as shown in fig. 1, while the left face is used for bearing pressure and is denoted as the thrust face.
In the well pipe, first, as shown in fig. 2, the bottom of the nose cone 4 is the same as the outside diameter of the pipe body of the well pipe, and the pipe pile construction method is completely different from the pipe pile construction method, and the nose cone is required to be relatively large, and the same requirement is given in chinese patent document CN201496070U, so that it is inevitable to retain the tapered member in the garbage pile and form the anchor end, and the well pipe cannot be recovered any more. In an embodiment of the invention, the nosecone 4 is relatively small and does not constitute an anchor end, and the well casing can be recovered smoothly.
It should be noted that, as described above, the length of the well pipe for the experiment is 6 to 8 meters, the excavation cost is too large by adopting the excavation mode, and the direct pulling out through the external force has better practicability.
Further, in order to obtain an annulus to be filled with crushed stone, the diameter of the tube is less than or equal to four fifths of the diameter of the perforating cylinder (the perforating tube 2 shown in fig. 1).
Further, the length of the pipe body is more than or equal to 1.5 times of the length of the pore-forming cylinder, under the condition, the depth of a base hole formed by the process pore-forming component is shorter than the length of the well pipe, the well pipe can partially descend from the bottom of the base hole and be inserted into a deeper garbage pile body, and the well pipe can be kept in a vertical state under the condition that the well pipe is separated from the wall of the base hole, so that the later operation is facilitated.
Specifically, the construction method of the landfill gas guide and drainage gas collecting well comprises the following steps:
1) and (3) applying pressure at the pressure bearing surface by taking the front guide cone 1 as a feed head at the selected position of the garbage pile body, and gradually pressing the technical hole part into the garbage pile body until a first length is remained outside the garbage pile body.
The selected position is obviously identical to the current gas collecting well position selection, and the detailed description is omitted.
The first length is reserved outside the waste heap only for the purpose of the exposed portion that needs to be sufficient for example for the tine to be able to drag it out of the waste heap body by shoveling it from below the blind plate 3. It will be appreciated that if the process apertured member is relatively long, the first length may also be relatively long, and more so may be performed by an inexperienced operator.
It will also be appreciated that since the process open-porous part is shorter than the well tubular, in other words equipment capable of satisfactory well tubular construction is necessarily also capable of satisfactory construction of the process open-porous part, the first length may be relatively long, thereby leaving a larger operating space.
Further, step 2) of applying a pulling force to the counter-thrust surface to pull the process opening member out of the waste stack, thereby forming a base hole at the selected location, the pulling force being in a direction opposite to said pressing force.
The surface layer is usually a plain soil layer, the shape of the basic holes is kept stable and exceeds the plain soil layer downwards to form garbage, although the shape keeping degree is relatively poor, the garbage is not in a completely loose state after being laminated on the surface layer, and the shape of the basic holes in the garbage can be kept better in a short time.
In chinese patent document CN201496070U, for example, the conical extrusion head is much thicker than the well pipe, and the conical extrusion head is a conical structure, which is suitable for forming a hole but cannot shape a base hole. In the embodiment of the invention, the hole forming tube body 2 can shape the hole formed by the front guide cone 1 in the process of advancing along with the front guide cone 1, so that the formed hole state can be ensured to keep a better shape in a shorter time.
And 3) putting the well pipe into the base hole until the head cone 4 is contacted with the bottom of the base hole, applying pressure to the flange 9, pressing the well pipe into the garbage pile body until the second length of the well pipe is remained outside the garbage pile body, and leaving a filling space between the well pipe and the base hole.
The second length is the length required for tubing, and belongs to conventional parameters in the construction of the gas collecting well, and is not described herein again.
The filling space is the annulus as described above, and step 4) is performed, wherein the filling space is filled with crushed stone to a given distance from the base hole opening, and the given distance determines the sealing space.
The broken stone is also the broken stone of the commonly used granularity of current gas collecting well construction, and the repeated description is not repeated here either.
The depth of the sealed space is approximately consistent with the thickness of the plain soil layer, and is not required to be completely consistent, so that the construction precision requirement is low.
The crushed stone provides larger clearance, which is beneficial to the landfill gas to penetrate into the well pipe. Meanwhile, the broken stones can shield the garbage, and the air inlet 7 is prevented from being burnt.
And 5) filling soil into the sealed space and compacting.
In a preferred embodiment, the well casing is sealed in step 3) before lowering the well casing. The seal can be made of cotton cloth to surround the mouth of the well pipe, i.e. the end where the flange 9 is located, and the cotton cloth can also avoid sparks generated by rubbing between the flange 9 and, for example, the relieving teeth.
In addition, after the sealed space is filled with soil and compacted, gas collecting equipment can be directly installed on the flange, such as one reducing tee, two flanges and one stop valve.
As described above, the well pipe and the technical hole-opening member are covered with cotton cloth or other materials which are not easily rubbed against iron, for example, and which are not easily rubbed against each other to generate electric sparks, and, in addition to cotton cloth, asbestos, plastic, rubber, etc. are commonly used.
In order to ensure the construction quality, in some embodiments, an auxiliary tool, such as a positioning assembly shown in fig. 1, which mainly has two assemblies, namely a lower assembly D1 and an upper assembly D2, is used, and each assembly is composed of two basic assembly bodies, such as an upper assembly D2 shown in fig. 4, which can be split into two parts from a vertical section and then folded to form a complete upper assembly.
It will be appreciated that the locating elements are primarily intended to aid in location and therefore the alignment between the two element bodies may be a virtual alignment, i.e. no direct connection is made but rather a joint is required.
Further, regarding the lower component D1, denoted as a first process part, it has the first via hole 13 in fig. 3; when the hole is formed, the first process part is placed at a selected position, and the process hole-forming part is guided in through the first through hole 13 to form the hole; influenced by low requirement of process precision, the aperture of the first via hole 13 is slightly larger than the aperture forming tube body 2, and is generally 5-25 mm larger.
A second process feature, such as upper assembly D2 in fig. 3 and 4, is provided having a second via 11 and is positioned on the first process feature such that the second via 11 remains coaxial with the first via 13.
Accordingly, when the tubular is being run down, the second process component is positioned on the first process component and the tubular is run down through the second via, so that the tubular and the base bore can maintain relatively good concentricity, thereby leaving the annulus radially about the same.
Similarly, the aperture of the second via hole 11 is slightly larger than the pipe diameter of the well pipe, generally 5-25 mm larger, so as to avoid the motion interference as much as possible.
The first process part and the second process part are split, the two split bodies are combined to form the second process part, and the first process part and the second process part are convenient to remove after the well pipe is put in place.
In specific construction, the process of taking out the technical hole-forming part is kept at a constant speed, and the taking-out speed is less than or equal to 0.5m/s, so that the problem that the diameter of the base hole is reduced due to the fact that the technical hole-forming part is taken out too fast is avoided.
Furthermore, the air leakage groove in the axial direction of the technical hole-forming part is formed in the surface of the technical hole-forming part, so that air can be supplemented in the process of pulling the technical hole-forming part, and the probability of hole shrinkage or the hole shrinkage amount can be effectively reduced.
In the case of well pipes, the pipe should be sealed as soon as possible after it is put in place to avoid the escape of landfill gas.
Preferably, the length of the pipe body is 2.0-2.7 times of the length of the hole forming cylinder;
the external diameter of the pipe body is four fifths of the external diameter of the pore-forming cylinder.
When the applicable landfill site continues to landfill the garbage, the well pipe is pulled out by using the flange 9 as a pulling head.
The length of the nose cone is three fifths of the length of the front guide cone, the taper degrees are different, and the positioning is convenient and rapid.
Claims (9)
1. A landfill gas drainage gas collecting well construction method is characterized in that a process opening part and a given well pipe are adapted;
wherein, the technical hole-forming component is provided with a hole-forming cylinder, a front guide cone positioned at one end of the hole-forming cylinder and an actuating body positioned at the other end of the hole-forming cylinder; the diameter of the bottom of the front guide cone is the same as that of the pore-forming cylinder, the actuating body is provided with a pressure-bearing surface and a reverse thrust surface, the pressure-bearing direction of the pressure-bearing surface is the direction from the actuating body to the front guide cone, and the pressure-bearing direction of the reverse thrust surface is opposite to the pressure-bearing surface;
the well pipe is provided with a pipe body with an air inlet hole, a head cone positioned at one end of the pipe body and a pipe connecting flange positioned at the other end of the pipe body; the bottom of the nose cone is the same as the outer diameter of the pipe body, the diameter of the pipe body is less than or equal to four fifths of the diameter of the pore-forming cylinder, and the length of the pipe body is more than or equal to 1.5 times of the length of the pore-forming cylinder;
the construction method of the landfill gas guide and drainage gas collecting well comprises the following steps:
1) the front guide cone is used as a feeding head at the selected position of the garbage pile body, pressure is applied to the pressure-bearing surface, and the technical hole-opening part is gradually pressed into the garbage pile body until a first length is remained outside the garbage pile body;
2) applying a pulling force to the reverse pushing surface, and pulling the technical hole opening component out of the garbage pile body to form a base hole, wherein the direction of the pulling force is opposite to that of the pressure;
3) putting the well pipe into the base hole until the head cone is contacted with the bottom of the base hole, applying pressure to the flange, pressing the well pipe into the garbage pile body until the second length of the well pipe is remained outside the garbage pile body, and leaving a filling space between the well pipe and the base hole;
4) filling broken stones into the filling space to a position which is a given distance away from the hole opening of the base hole, wherein the given distance determines a sealed space;
5) filling soil into the sealed space and compacting;
providing a first process component having a first via;
when in hole forming, the first process component is placed at a selected position, and the process hole-forming component is led in through the first through hole to form a hole;
providing a second process part, wherein the second process part is provided with a second through hole and is positioned on the first process part, so that the second through hole and the first through hole are kept coaxial;
while lowering the pipe, positioning a second process component on the first process component, the pipe being lowered through the second via;
the first process part and the second process part are both split bodies, and the two split bodies are combined to form the second process part.
2. The method for constructing the landfill gas guide and drainage gas collecting well, as recited in claim 1, wherein in the step 3), the well pipe needs to be sealed before the well pipe is lowered.
3. The method of claim 1 or 2 wherein the well casing and the technical bore component are covered with cotton cloth at the contact area with the corresponding force application component to avoid electrical sparking.
4. The construction method of the landfill gas guide and exhaust gas collecting well, as recited in claim 1, characterized in that the process hole opening part is taken out at a constant speed which is less than or equal to 0.5 m/s.
5. The method for constructing the landfill gas guide and exhaust gas collection well as recited in claim 4, wherein the surface of the technical opening part is provided with a gas release groove which is axially oriented.
6. The construction method of the landfill gas guiding and collecting well as defined by claim 1, wherein the well casing is lowered to the proper position and then sealed to prevent the landfill gas from leaking.
7. The construction method of the landfill gas guide and exhaust gas collection well as recited in claim 1, wherein the length of the pipe body is 2.0-2.7 times of the length of the hole forming cylinder;
the external diameter of the pipe body is four fifths of the external diameter of the pore-forming cylinder.
8. The landfill gas guiding and discharging gas collecting well construction method according to claim 1, wherein if the applicable landfill site continues to landfill the garbage, the well pipe is lifted out by using the flange as the pulling head.
9. The method of constructing a landfill gas drainage and gas collection well of claim 1, wherein the nose cone is three-fifths the length of the lead cone.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4544515A (en) * | 1982-11-05 | 1985-10-01 | Compagnie Internationale Des Pieux Armes Frankignoul | Method for producing in-situ concreted piles with enlarged bases |
| CN1830849A (en) * | 2005-12-07 | 2006-09-13 | 余元旗 | Sunk cone well pile for garbage category sludge gas collection well construction and its construction method |
| CN101597563A (en) * | 2009-07-13 | 2009-12-09 | 创东能源环保科技（福建）有限公司 | The constructional method of refuse embedded gas collection and generating set and gas collection well |
| CN201495219U (en) * | 2009-10-13 | 2010-06-02 | 黄榛 | Direct-insert landfill gas collecting well |
| CN201496070U (en) * | 2009-07-13 | 2010-06-02 | 创东能源环保科技（福建）有限公司 | Construction equipment of refuse filler gas-gathering well of refuse landfill site |
| CN205650585U (en) * | 2016-05-05 | 2016-10-19 | 泰州职业技术学院 | Landfill gas collecting device |
| CN107144306A (en) * | 2017-06-19 | 2017-09-08 | 北京国环清华环境工程设计研究院有限公司 | A kind of multifunctional well applied to refuse landfill |
| CN208066924U (en) * | 2017-12-27 | 2018-11-09 | 北京蓝天沃土科贸有限公司 | A kind of gas discharging apparatus of landfill venue |
-
2019
- 2019-06-27 CN CN201910567140.XA patent/CN110293109B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4544515A (en) * | 1982-11-05 | 1985-10-01 | Compagnie Internationale Des Pieux Armes Frankignoul | Method for producing in-situ concreted piles with enlarged bases |
| CN1830849A (en) * | 2005-12-07 | 2006-09-13 | 余元旗 | Sunk cone well pile for garbage category sludge gas collection well construction and its construction method |
| CN101597563A (en) * | 2009-07-13 | 2009-12-09 | 创东能源环保科技（福建）有限公司 | The constructional method of refuse embedded gas collection and generating set and gas collection well |
| CN201496070U (en) * | 2009-07-13 | 2010-06-02 | 创东能源环保科技（福建）有限公司 | Construction equipment of refuse filler gas-gathering well of refuse landfill site |
| CN201495219U (en) * | 2009-10-13 | 2010-06-02 | 黄榛 | Direct-insert landfill gas collecting well |
| CN205650585U (en) * | 2016-05-05 | 2016-10-19 | 泰州职业技术学院 | Landfill gas collecting device |
| CN107144306A (en) * | 2017-06-19 | 2017-09-08 | 北京国环清华环境工程设计研究院有限公司 | A kind of multifunctional well applied to refuse landfill |
| CN208066924U (en) * | 2017-12-27 | 2018-11-09 | 北京蓝天沃土科贸有限公司 | A kind of gas discharging apparatus of landfill venue |
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