CN102383441B - Gas diversion well in landfill site and its construction technology and usage method - Google Patents

Abstract

The embodiment of the invention discloses a refuse landfill gas guiding and exhausting well and a construction process and a use method thereof. The refuse landfill gas guiding and exhausting well comprises a vertical shaft and a gas collection pipe; the vertical shaft is arranged in a refuse landfill; the gas collection pipe is used for collecting gas generated from the refuse; and the lower opening of the gas collection pipe is arranged at the bottom of the vertical shaft. The refuse landfill gas guiding and exhausting well further comprises a sleeve barrel; the sleeve barrel is connected with the gas collection pipe, used for guiding and exhausting gas collected by the gas collection pipe and arranged at the opening of the vertical shaft to cover the upper opening of the gas collection pipe; and the sleeve barrel is filled with gravel. Due to the adoption of the technical means of fixing the vertical shaft by adopting the sleeve barrel in the embodiment of the invention, the problems of the deformation and damage of the refuse landfill gas guiding and exhausting well can be avoided due to the dead weight of the sleeve barrel and the weight of the gravel in the sleeve barrel, and the gas can be guided and exhausted smoothly.

Description

Gas diversion well in landfill site and its construction technology and usage method

technical field

The invention relates to a technology for guiding and discharging gas and liquid produced by material piles, in particular to a gas guiding well in a landfill and its construction process and use method.

Background technique

As shown in Figure 1, the gas guide wells of the existing landfills need to connect the gas collecting pipe 100 upwards to continue the gas guide when the garbage pile increases. For example, when a bulldozer is used for landfill disposal, due to the heavy weight of the bulldozer, the impact on the drainage well is also great. In addition to the settlement of the garbage itself, the gas drainage well and the gas collecting pipe 100 inside are easily twisted, deformed or even damaged. , affecting the conduction of gas.

Contents of the invention

The technical problem to be solved by the embodiments of the present invention is to provide a landfill gas drainage well that is not affected by large-scale mechanical operations, does not cause deformation, damage and other problems, and ensures smooth gas drainage.

In order to solve the above-mentioned technical problems, the embodiment of the present invention proposes a gas guide shaft in a landfill, including a vertical shaft arranged in a landfill, and a gas collecting pipe for collecting gas generated by garbage. The lower nozzle is arranged at the bottom of the vertical shaft, and the gas guide shaft of the landfill site also includes: a sleeve connected to the gas collecting pipe to guide and discharge the gas collected by the gas collecting pipe, and the sleeve is arranged on At the wellhead of the shaft and covering the upper nozzle of the gas collecting pipe, the inside of the casing is filled with gravel.

Further, clay for sealing is filled between the casing and the well wall of the shaft.

Further, the sleeve includes a spiral tube, a blind plate sealed on the upper nozzle of the spiral tube, and a flange and a gasket for sealing connection arranged between the spiral tube and the blind plate. Spiral pipes, blind plates and flanges are all carbon steel materials that have been treated with rust removal and painting.

Furthermore, the two sides of the upper nozzle of the spiral tube are symmetrically provided with lifting lugs for hoisting the barrel.

Further, a handle for moving the blind plate and an air pipe for outputting the gas are provided on the upper surface of the blind plate.

On the other hand, the embodiment of the present invention proposes a construction process for gas diversion wells in landfills, including: a laying step: putting or connecting the gas collecting pipe in the shaft, and connecting the gas collecting pipe and the gas collecting pipe The well walls of the shaft are filled with gravel to a depth of 1.5-2.5 meters below the surface of the garbage; the sealing step: put the spiral tube into the shaft, and insert it between the gas collecting pipe and the inner wall of the spiral tube After filling with gravel, the spiral pipes are assembled into a bucket set.

Further, before the step of laying, it also includes: a well-drilling step: using a pile driver to dig a shaft in the landfill.

Further, the sealing step also includes: installing a blind plate and an air pipe after the upper nozzle of the spiral tube is provided with a flange and a sealing gasket; packing clay tightly between the outer wall of the casing and the well wall of the shaft seal.

On the other hand, the embodiment of the present invention proposes a method for using a gas diversion well in a landfill site. The method is: when the height of the garbage surface from the top of the gas collecting pipe is less than or equal to 2 meters, ensure that the Under the premise that the sleeve bucket continues to be embedded in the rubbish heap, the sleeve bucket is lifted upwards.

Further, the elevated height is 1 meter to 3 meters.

The beneficial effect of the embodiment of the present invention is: by adopting the technical means of casing cementing, by virtue of the weight of the casing itself and the weight of the gravel in the casing, problems such as deformation and damage of the gas guide well in the landfill are avoided, Ensure the smooth conduction of gas.

Description of drawings

Fig. 1 is a schematic structural diagram of a gas diversion well in the prior art.

Fig. 2 is a schematic structural view of a barrel casing of a gas diversion well in a landfill site according to an embodiment of the present invention.

Fig. 3 is a top view of the sleeve shown in Fig. 2 .

Fig. 4 is a schematic diagram of the laying steps of the construction process of the gas diversion well in the landfill according to the embodiment of the present invention.

Fig. 5 is a schematic diagram of the sealing steps of the construction process of the gas diversion well in the landfill according to the embodiment of the present invention.

Fig. 6 is a schematic diagram of the use of the gas diversion well of the landfill site according to the embodiment of the present invention.

Detailed ways

Please refer to Fig. 2 to Fig. 5, the gas diversion well of the landfill site according to the embodiment of the present invention adopts the technical means of casing cementing, and by virtue of the weight of the casing itself and the weight of the gravel in the casing, it can avoid landfilling Deformation, damage and other problems occurred in the field gas conduction well, which ensured the smooth conduction of gas. The gas guide shaft in the landfill site includes a vertical shaft 10 , a gas collecting pipe 20 , and a casing 30 .

The shaft 10 is opened in the landfill.

The lower nozzle of the gas collecting pipe 20 is arranged at the bottom of the shaft 10 for collecting the gas generated by the garbage, and is a breathable gas collecting pipe 20 .

The sleeve barrel 30 is connected to the gas collecting pipe 20 to guide and discharge the gas collected by the gas collecting pipe 20, and covers the upper nozzle of the gas collecting pipe 20, and is arranged at the wellhead of the shaft 10, specifically, the depth of embedding the surface of the garbage is 1.5 meters~ 2.5 meters, preferably 2 meters in this embodiment, the length of the barrel 30 is 3 meters to 6 meters, preferably 5 meters in this embodiment, and is filled with clay 40 for sealing between it and the well wall of the shaft 10 , the interior is filled with gravel 50, used to collect and guide the gas, the height of the gravel 50 can be equal to the upper nozzle of the gas collecting pipe 20 according to needs, of course, between the upper nozzle and the sleeve 30 Under the condition that the inner bottom surface of the barrel is flat, it can also reach the height that the copper sleeve is filled to the ground, and it can also be lower than the height of the upper nozzle, so as to ensure the vertical stability of the sleeve barrel 30 as a standard. The sleeve 30 includes a spiral tube 31 , a blind plate 33 , a flange 35 and a gasket 37 .

The spiral pipe 31, the blind plate 33 and the flange 35 correspond to a diameter of 600 mm, which is a DN600 model, and are all carbon steel materials that have been treated with derusting and painting.

The blind plate 33 is sealed on the upper nozzle of the spiral tube 31 . Wherein, the upper surface of the blind plate 33 is provided with a handle 331 for moving the blind plate 33 and an air pipe 333 for outputting the gas, and the air pipe 333 is a DN65 steel pipe connected by a DN65 flange 35 .

The flange 35 and the gasket 37 are placed between the spiral tube 31 and the blind plate 33 for sealing connection.

In this embodiment, lifting lugs 311 are symmetrically arranged on both sides of the nozzle of the spiral pipe 31, and the lifting lugs 311 are used for hoisting the sleeve barrel 30, thereby facilitating the installation of gas guide wells in landfills. After the construction work and completion, the upper cover barrel 30 is carried out to continue guiding and exhausting gas.

The construction technology of the gas guide well in the landfill of the embodiment of the present invention includes:

Well drilling step: use a pile driver to drill a shaft 10 in the landfill.

Laying step: put the gas collecting pipe 20 in the shaft 10, fill the space between the gas collecting pipe 20 and the wall of the shaft 10 with gravel 50 to a depth of 1.5 meters to 2.5 meters below the surface of the garbage; The embodiment is preferably 2 meters, as shown in FIG. 4 .

Sealing step: first, put the spiral tube 31 into the shaft 10; then, fill the gap between the gas collecting pipe 20 and the inner wall of the spiral tube 31 with gravel 50; then, assemble the spiral tube 31 into a barrel set 30, that is to install the blind plate 33 and the gas delivery pipe 333 after the flange 35 and the sealing gasket 37 are set on the upper nozzle of the spiral pipe 31; Tighten the clay 40 seal, as shown in FIG. 5 .

Please refer to Fig. 6, the corresponding label 200 is an increased garbage heap, the use method of the gas guide well in the garbage landfill in the embodiment of the present invention is, when the height of the garbage surface from the top of the gas collecting pipe 20 is less than or equal to 2 meters When continuing to landfill and pile up, under the premise of ensuring that the sleeve 30 continues to be embedded in the garbage heap (such as ensuring that the lower end is embedded at a depth of 1.5 meters to 2.5 meters below the surface of the garbage), the sleeve 30 is raised upward for a predetermined period. high. Wherein, the predetermined height is 1 meter to 3 meters, preferably 2.8 meters. That is to say, when the garbage continues to be piled high, it is not necessary to dismantle the sleeve 30, only the sleeve 30 is lifted to a certain height with a loader. At this time, the height of the gravel 50 in the sleeve 30 is relatively reduced, but the Due to the weight of the sleeve 30 itself, the weight of the gravel 50 in the sleeve 30 and the extrusion force of the increased garbage, the gas guide well in the landfill will not be affected by the use of large machinery such as bulldozers for landfill disposal. And deformation, damage.

Further, when the sleeve 30 is lifted to a certain length, for example, after lifting the sleeve 30 meters, the sleeve 30 will be unstable or the garbage will enter the mouth of the air collecting pipe 20, etc., the sleeve 30 needs to be pulled out for landfill. At this time, the corresponding construction techniques include:

Laying step: connect the air collecting pipe 20 in the shaft 10, fill the space between the air collecting pipe 20 and the wall of the shaft 10 with gravel 50 to a height of 1.5 meters to 2.5 meters from the surface of the garbage, this implementation The way is preferably 2 meters.

Sealing step: first, put the spiral tube 31 into the shaft 10; then, fill the gap between the gas collecting pipe 20 and the inner wall of the spiral tube 31 with gravel 50; then, assemble the spiral tube 31 into a barrel set 30, that is to install the blind plate 33 and the gas delivery pipe 333 after the flange 35 and the sealing gasket 37 are set on the upper nozzle of the spiral pipe 31; Tight clay 40 seal.

When no more garbage is buried in the landfill, the sleeve can be pulled out, and the mouth of the gas collecting pipe 20 can be directly connected to the gas delivery pipe 333 . It should be noted that the gas diversion well of the landfill in the embodiment of the present invention is not limited to the diversion of gas, but can also be used for the diversion of landfill leachate.

The foregoing is a specific embodiment of the present invention, and it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications are also considered Be the protection scope of the present invention.

Claims (10)

1. a gas drainage well of refuse landfill, comprise the vertical shaft that is arranged in refuse landfill, for collect gas that rubbish produces can continued access discharge, the lower nozzle of described discharge is located at described silo bottom, it is characterized in that, described gas drainage well of refuse landfill also comprises:

Be connected with described discharge with the cover bucket that can upwards lift lifting of the collected gas of discharge described in guide, described cover bucket is arranged at the well head place of described vertical shaft and covers described discharge upper orifice, and the inside of described cover bucket is filled with grit.

2. gas drainage well of refuse landfill as claimed in claim 1, is characterized in that being filled with the clay for sealing between described cover bucket and the borehole wall of described vertical shaft.

3. gas drainage well of refuse landfill as claimed in claim 1, it is characterized in that, blind plate and pad that described cover bucket comprises helix tube, be sealed in described helix tube upper orifice are located at flange and the sealing gasket for being tightly connected between described helix tube and blind plate, and described helix tube, blind plate and flange are the carbon steel material of processing through rust cleaning mopping.

4. gas drainage well of refuse landfill as claimed in claim 3, is characterized in that, is provided with to described helix tube upper orifice bilateral symmetry for lifting the hanger of described cover bucket.

5. gas drainage well of refuse landfill as claimed in claim 3, is characterized in that, described blind plate upper surface is provided with for the handle of mobile blind plate with for exporting the appendix of described gas.

6. a construction technology for gas drainage well of refuse landfill as claimed in claim 1, is characterized in that, described construction technology comprises:

Lay step: in described vertical shaft, put into or continued access described in discharge, to filling grit between described discharge and the borehole wall of described vertical shaft to the degree of depth of 1.5 meters ~ 2.5 meters under rubbish surface;

Sealing step: helix tube is put into described vertical shaft, fill after grit between described discharge and the inwall of described helix tube, by the complete bucket of described helix tube assembling.

7. the construction technology of gas drainage well of refuse landfill as claimed in claim 6, is characterized in that, before described laying step, also comprises:

Well-digging step: get vertical shaft with piling machine in refuse landfill.

8. the construction technology of gas drainage well of refuse landfill as claimed in claim 6, is characterized in that, described sealing step also comprises:

After arranging flange and sealing gasket, the upper orifice of described helix tube loads onto blind plate and appendix;

Between cover bucket outer wall and the borehole wall of described vertical shaft, fill out tight clay sealing.

9. the using method of a gas drainage well of refuse landfill as claimed in claim 1, it is characterized in that, described using method is: when discharge overhead height is less than or equal to 2 meters described in rubbish surface distance, in the described cover bucket of an assurance continuation embedding, stands under the prerequisite in rubbish heap described cover bucket is upwards lifted.

10. the using method of gas drainage well of refuse landfill as claimed in claim 9, is characterized in that, described in the height that lifts be 1 meter ~ 3 meters.

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