CN211471188U

CN211471188U - Vertical multi-layer sleeve septic tank

Info

Publication number: CN211471188U
Application number: CN201922100451.3U
Authority: CN
Inventors: 蔺振占; 杨丙胜
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2020-09-11
Anticipated expiration: 2029-11-29

Abstract

A vertical multi-layer sleeve septic tank. The sealing performance of the septic tank installed by the existing residents in each household is poor, and the septic tank effect is poor. The utility model discloses a between bottom (1) and upper cover (5): the outmost is set up to urceolus (2), section of thick bamboo (3) in the internally mounted of urceolus (2), well section of thick bamboo (3) internally mounted inner tube (4), urceolus (2), well section of thick bamboo (3), the top port of inner tube (4) all with upper cover (5) sealing connection, the bottom port all with bottom (1) sealing connection, the chamber that separates that forms between well section of thick bamboo (3) and inner tube (4) is as elementary corruption district, inner tube (4) inner space is as degree of depth corruption district, the chamber that separates that forms between urceolus (2) and well section of thick bamboo (3) is as clarification district, elementary corruption district is through first pipe (6) intercommunication degree of depth corruption district, degree of depth corruption district is through second pipe (7) intercommunication clarification district. The utility model discloses it is strong to have sealing performance, and the compressive capacity of the jar body is big, is applicable to the cold area and uses.

Description

Vertical multi-layer sleeve septic tank

Technical Field

The utility model relates to a vertical multi-layer sleeve septic tank.

Background

Toilets are closely related to public health and are one of important marks reflecting the progress degree of social civilization, in 2 months in 2018, a rural human living environment improvement three-year action scheme is published in a central office and a state office in China, toilet feces treatment is carried out, a toilet improvement mode is reasonably selected, and a toilet revolution is promoted. Toilet improvement is one of the key points of rural environmental sanitation facility improvement and is one of eight major elements of the primary health care of the world health organization. Human and livestock produce feces as physiological excreta every day. Human and animal excreta which are not harmlessly treated are main vectors for spreading intestinal infectious diseases and parasitic diseases and are also main residences for breeding infectious diseases such as mosquitoes, flies and the like, so that the disease spreading is caused, and the health of rural residents is seriously affected.

The Zhai Jianling is recorded in the application and development of septic tanks, which is a treatment facility for removing suspended organic matters in fecal sewage by using the processes of sedimentation and anaerobic fermentation, and belongs to a primary transitional life treatment structure. The concentration of suspended solid in the fecal sewage is 100 mg/L-350 mg/L, the BOD5 of organic matter concentration is between 100 mg/L-400 mg/L, wherein the BOD5 of suspended organic matter concentration is 50 mg/L-200 mg/L. The sewage enters the septic tank and is precipitated for 12 to 24 hours, and 50 to 60 percent of suspended matters can be removed. The settled sludge is subjected to anaerobic nitrification for more than 3 months, so that organic matters in the sludge are decomposed into stable inorganic matters, and the putrescible raw sludge is converted into stable cooked sludge, thereby changing the structure of the sludge and reducing the water content of the sludge. The sludge is periodically removed and transported out, buried or used as fertilizer.

It is also described in the article of research on microbial reduction technology and mechanism of sludge in septic tanks in cities by songbeixia that Anaerobic Digestion technology (Anaerobic Digestion Technique), which is a process of converting various organic substances into methane, carbon dioxide and the like by using the life activities of Anaerobic microorganisms in an Anaerobic environment, cannot be used in the Anaerobic fermentation process.

Anaerobic digestion is a common stable process for realizing reduction, stabilization, recycling and harmless treatment of organic solid wastes, and has the advantages of low energy consumption, effective killing of pathogenic bacteria, good sludge stability and the like, so the anaerobic digestion technology is widely applied to various countries in the world.

In the 30's of the 20 th century, anaerobic digestion was broadly divided into acidogenic and methanogenic stages, i.e., two-stage theory. The theory is that according to the biochemical process caused by bacteria, the metabolic bacteria group is divided into two groups of non-methanogenic fermentative bacteria (or hydrolytic bacteria and acidogenic bacteria) and methanogenic bacteria, and the fermentation stage is divided into acidogenic stage and aerogenic stage. The two-stage theory of anaerobic reaction is shown in figure 29.

The two-stage theory was modified by Bryantlzgl et al in the early 70 s, which proposed a three-stage theory of anaerobic digestion:

(1) a liquefaction stage: at this stage, complex organic substances (cellulose, proteins, fats, etc.) are degraded to basic structural units or simple organic acids, alcohols, etc. under the enzyme catalysis of facultative microorganisms and a few anaerobic microorganisms.

(2) Acid production stage: the liquefied products are absorbed into the body of the microorganism and are converted into low molecular compounds mainly comprising volatile acids such as acetic acid, butyric acid and lactic acid, and ethanol, methanol and hydrogen under the catalytic action of intracellular enzymes. The amount of acetic acid was maximal, about 80%.

(3) A methanogenesis stage: because the matrix for producing methane is abundant and the ammonia nitrogen concentration is increased due to the activity of ammonia-producing bacteria, the redox potential in the fermentation liquor is reduced, a proper environmental condition is provided for the methane-producing bacteria, the methane-producing bacteria are promoted to rapidly grow and reproduce, and acetic acid, formic acid, methanol, hydrogen, carbon dioxide and the like are converted into methane.

The three-stage theory and the four-stage theory of anaerobic digestion are shown in fig. 30, in which,

i, II and III are three-stage theories, and I, II, III and IV are four-stage theories;

② the cell material produced is not shown in the figure.

Zeikuslao et al proposed four group theories of anaerobic digestion reflecting the role of homoacetogens. The theory holds that the anaerobic fermentation process can be divided into four stages:

(1) a hydrolysis stage: decomposing insoluble macromolecular organic matters into micromolecular water-soluble low-fatty acids;

(2) and (3) acidification stage: the fermentation bacteria convert the water-soluble low fatty acid into hydrogen, acetic acid, ethanol and the like, and the pH value of the feed liquid is rapidly reduced in the acidification stage;

(3) hydrogen production and acetic acid production stages: the oxidizing action of the special hydrogen-producing acetogenic bacteria on the reducing organic matters generates hydrogen, HCO3 and acetic acid. Homoacetogenic bacteria convert hydrogen, HCO3, to acetic acid, which at this stage leads to an increase in pH due to the decomposition of large amounts of organic acids;

(4) a methanation stage: methanogens convert acetic acid to methane and carbon dioxide, reduce carbon dioxide to methane using hydrogen, or produce formic acid to methane using other bacteria.

The four-stage theory is that the anaerobic fermentation process is divided into four stages, and each stage has a unique microbial flora. The effective metabolism of various groups of bacteria is mutually closely coherent, reaches a certain balance instead of being separated independently, and is the process of mutual restriction and promotion. No matter the theory of three stages or the theory of four groups, the theory is basically supplementary and perfected to the theory of two stages, the dynamic balance relation of interaction, mutual influence and mutual restriction among different metabolic floras in the anaerobic fermentation process is well disclosed, and the microbial process of anaerobic digestion of complex organic matters is clarified. At present, more three-stage theories are used, and related microorganisms can be divided into hydrolytic fermentation floras, hydrogen-producing acetogenic floras, homoacetogenic floras, acetotrophic methane floras and hydrogentrophic floras according to functions.

At present, septic tanks installed by residents in households are generally two-half split type septic tanks and winding type glass fiber reinforced plastic septic tanks. Most of traditional two-half split septic tanks are assembled after being transported to the site, the lower tank body is firstly placed into a pre-dug pit, the upper tank body is buckled on the lower tank body, and then the upper tank body and the lower tank body are fastened and connected through bolts. This type's septic tank is difficult to guarantee the leakproofness between the upper tank body and the lower jar of body in actual installation operation process, and it is internal that the rainwater can appear flowing into septic tank jar along the installation gap often in the use to and septic tank is deposited liquid and is oozed and flow into near soil layer, seriously influence the result of use of septic tank. For the wound glass fiber reinforced plastic septic tank, the hollow cylindrical shell is manufactured in a glass fiber reinforced plastic winding mode to serve as the accommodating space of the tank body, and then glass fiber reinforced plastic end sockets are connected to the left end and the right end of the tank body, so that the tank body is manufactured. However, in the actual operation process, the left end head and the right end head are mostly installed and fixed on the hollow cylindrical shell in a manual bonding mode, and the bonding defect often occurs in the bonding process, so that the water leakage of the tank body in the use process is caused.

In addition, the traditional septic tank needs to dig a rectangular square pit for placing the septic tank storage tank during construction operation, and under the condition of the same storage volume, the circular pit digging operation surface required by the cylindrical septic tank is smaller, so that the septic tank is more suitable for being applied to a scene with limited space. Simultaneously, the split type septic tank of current two halves and wound form glass tempering manure pit, the top is drawn clearly and is overhauld the pipe and the top and draw the connected mode of maintenance mouth department and adopt PVC glue more and bond, generally wait to PVC glue solidify and just can carry out operation on next step in the work progress, seriously influence work efficiency to on-the-spot workman bonds the quality in operation process and is difficult to guarantee, often appears bonding department seepage and the crooked scheduling problem of bonding pipeline.

The existing cylindrical vertical septic tank is suitable for northern frigid areas, but the septic tank adopts a mode of additionally arranging heat insulation cotton on the outer side of the tank body to improve the heat insulation property, and the method undoubtedly complicates the manufacturing process and further leads to the increase of the manufacturing cost. Meanwhile, the top cover used by the septic tank is a flat top type, and the thickness of the backfill soil can be borne in the construction process.

Disclosure of Invention

The utility model aims at solving the problems and designing a vertical multi-layer sleeve septic tank.

The utility model discloses a vertical multilayer sleeve septic tank is designed and used on the basis of the three-stage theory of anaerobic digestion.

The three-grid septic tank consists of three mutually communicated sealed septic tanks, and excrement enters the first grid through the excrement inlet pipe and then sequentially flows to the second grid and the third grid.

The first lattice is a primary septic zone which is used for receiving fresh excrement every day and carrying out anaerobic fermentation, and stratification can be generated in the anaerobic fermentation process, wherein the upper layer is excrement skin, the middle layer is excrement liquid, and the bottom layer is excrement residue

The second grid is a deep rotting area which is the continuation of the first pool, and parasitic ova are continuously retained and precipitated, deep anaerobic fermentation is carried out, the concentration of free ammonia is increased, and sterilization and ova killing are carried out.

The third compartment is a clarification area, and because the liquid dung flowing into the third pool is generally decomposed, germs and worm eggs in the liquid dung are basically killed and removed, and the liquid dung can be used for fertilizing.

The volume of the three-grid septic tank is determined according to the number of people using the three-grid septic tank, the flushing water volume, the fermentation and decomposition time of excrement and the requirements of egg sedimentation and sterilization. The manure fermentation decomposition time and the pathogen death time are calculated according to 30 days, wherein the manure fermentation decomposition time and the pathogen death time are respectively 20 days in the first pool, 10 days in the second pool, and the volume of the third pool is at least the sum of the first two pools, so that the volume ratio of the first pool, the second pool and the third pool is 2: 1: 3.

the above purpose is realized by the following technical scheme:

a vertical multi-layer sleeve septic tank comprises a bottom cover, an outer cylinder, a middle cylinder, an inner cylinder, an upper cover, a first conduit and a second conduit;

between bottom and the upper cover: the outermost layer is provided with an outer cylinder, a middle cylinder is arranged in the outer cylinder, an inner cylinder is arranged in the middle cylinder, the top end ports of the outer cylinder, the middle cylinder and the inner cylinder are hermetically connected with an upper cover, the bottom end ports of the outer cylinder, the middle cylinder and the inner cylinder are hermetically connected with a bottom cover, a separation cavity formed between the middle cylinder and the inner cylinder is used as a primary decomposition area, the inner space of the inner cylinder is used as a deep decomposition area, and a separation cavity formed between the outer cylinder and the middle cylinder is used as a clarification area;

the primary septic zone between the middle cylinder and the inner cylinder is communicated to the deep septic zone inside the inner cylinder through a first conduit, and the deep septic zone inside the inner cylinder is communicated to the clarification zone between the outer cylinder and the middle cylinder through a second conduit;

the upper cover is provided with a clarification access hole, a deep-rotting access hole, a primary-rotting access hole and a water inlet, the primary-rotting access hole is communicated with the water inlet to form a primary-rotting area between the middle barrel and the inner barrel, the deep-rotting access hole is communicated with a deep-rotting area inside the inner barrel, and the clarification access hole is communicated with a clarification area between the outer barrel and the middle barrel.

Has the advantages that:

1. the utility model discloses a vertical multilayer sleeve septic tank adopts the preparation of modified moulding materials such as ABS, PE, PP, PA, adopts the telescopic tank structure of three-layer, and the advantage of this structure lies in can keeping warm to inboard sleeve with the help of the sleeve in the outside, has saved the heat preservation promptly, can guarantee the required temperature of jar interior fermentation to a certain extent again.

2. The utility model discloses a vertical multilayer sleeve septic tank, its inner tube, well section of thick bamboo, urceolus all adopt plastics welded mode to link to each other with the bottom, and the upper cover also takes welded mode to be connected with the urceolus. Through the plastic welding's connected mode, not only improved the connection quality of the jar body, more guaranteed the leakproofness of the jar body, avoided the seepage problem that traditional split type septic tank exists.

3. The utility model relates to a vertical multilayer sleeve septic tank, the upper cover is equipped with the upper cover boss, make inner tube and well section of thick bamboo exert the supporting role better in practical application, the lateral wall of urceolus is equipped with spiral strengthening rib structure simultaneously, strengthen the compressive capacity of the jar body, make the jar body can bear the extrusion force that more backfill soil brought, can bury darker underground position according to the operational aspect needs when practical application, consequently, can guarantee that the septic tank jar body is not under the condition of taking insulation material certainly, still can obtain required fermentation temperature. Thereby making the utility model create the septic tank body which is related to, and is more suitable for being used in cold areas and alpine regions.

4. The utility model discloses create the vertical multilayer sleeve septic tank that relates, clearly draw in the top between access hole and the connecting tube wherein of cartridge, if clarification access hole and clarification district are clearly drawn between the pipe, all adopt the pyrocondensation area to connect. The thermal shrinkage belt is simple and convenient to operate, the field construction operation time is shortened, the connection quality is good, and the problems of pipeline deflection in the installation process, leakage in subsequent use and the like are effectively avoided.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic top view of the present invention with the upper cover removed;

fig. 3 is a cross-sectional view of the present invention;

fig. 4 is a schematic structural diagram of the bottom cover of the present invention;

FIG. 5 is a cross-sectional view of the bottom cover of the present invention;

FIG. 6 is a side view of the inner barrel of the present invention;

FIG. 7 is a cross-sectional view of the inner cylinder of the present invention;

fig. 8 is a side view of the middle tube of the present invention;

FIG. 9 is a schematic structural view of the outer cylinder with reinforcing ribs of the present invention;

FIG. 10 is a schematic view of the inner surface structure of the upper cover of the present invention;

FIG. 11 is a sectional view of the present invention with the inside of the upper cover facing upward;

FIG. 12 is a schematic structural view of the upper cover with a boss according to the present invention;

FIG. 13 is a schematic structural view of the upper cover with a boss of the present invention, with the inner side facing upwards;

FIG. 14 is a sectional view of the upper cover with a boss according to the present invention;

FIG. 15 is a view illustrating a usage state of the present invention;

fig. 16 is a top view of the cover with bosses in an in-use state of the present invention;

FIG. 17 is a schematic view of the installation and use of the present invention and a method for septic treatment;

FIG. 18 is an appearance diagram of a septic tank body with a flat upper cover and a flat outer cylinder side wall according to the simulation analysis part of the utility model;

FIG. 19 is an appearance diagram of a septic tank body with a boss on the upper cover and a smooth outer cylinder side wall, which is related to the simulation analysis part of the utility model;

FIG. 20 is an appearance diagram of a septic tank body with a flat upper cover and spiral reinforcing ribs on the side wall of an outer cylinder, which relates to the simulation analysis part of the utility model;

FIG. 21 is a diagram of a deformation analysis of a first test set according to the present invention after a load is applied;

fig. 22 is a graph of the stress analysis after the first test set according to the present invention is loaded;

FIG. 23 is a diagram illustrating a deformation analysis of a first comparative group according to the present invention after a load is applied;

fig. 24 is a graph showing the stress analysis after the first comparison group according to the present invention is applied with a load;

FIG. 25 is a diagram of the deformation analysis of the second test set according to the present invention after the application of a load;

fig. 26 is a graph of stress analysis after the second test set according to the present invention is loaded;

FIG. 27 is a graph showing the deformation analysis of the second comparative group after the load is applied;

fig. 28 is a graph showing stress analysis after the second comparison group according to the present invention is loaded;

FIG. 29 is a schematic representation of the two-stage theory of anaerobic reactions involved in the background of the invention;

FIG. 30 is a graphical representation of the three-stage theory and the four-stage theory of anaerobic digestion involved in the background of the invention.

Detailed Description

The first embodiment is as follows:

a vertical multi-layer sleeve septic tank of the embodiment, as shown in fig. 1-17, comprises a bottom cover 1, an outer cylinder 2, a middle cylinder 3, an inner cylinder 4, an upper cover 5, a first conduit 6 and a second conduit 7;

between bottom lid 1 and upper cover 5: the outermost layer is provided with an outer barrel 2, a middle barrel 3 is arranged in the outer barrel 2, an inner barrel 4 is arranged in the middle barrel 3, the top end ports of the outer barrel 2, the middle barrel 3 and the inner barrel 4 are hermetically connected with an upper cover 5, the bottom end ports of the outer barrel 2, the middle barrel 3 and the inner barrel 4 are hermetically connected with a bottom cover 1, a separation cavity formed between the middle barrel 3 and the inner barrel 4 serves as a primary decomposition area, the inner space of the inner barrel 4 serves as a deep decomposition area, and the separation cavity formed between the outer barrel 2 and the middle barrel 3 serves as a clarification area;

the primary septic zone between the middle cylinder 3 and the inner cylinder 4 is communicated to the deep septic zone inside the inner cylinder 4 through a first conduit 6, and the deep septic zone inside the inner cylinder 4 is communicated to the clarifying zone between the outer cylinder 2 and the middle cylinder 3 through a second conduit 7;

the upper cover 5 is provided with a clarification access hole 5a, a deep-rotting access hole 5b, a primary-rotting access hole 5c and a water inlet 5d, the primary-rotting access hole 5c is communicated with the water inlet 5d to form a primary-rotting area between the middle barrel 3 and the inner barrel 4, the deep-rotting access hole 5b is communicated with a deep-rotting area inside the inner barrel 4, and the clarification access hole 5a is communicated with a clarification area between the outer barrel 2 and the middle barrel 3.

The second embodiment is as follows:

different from the first embodiment, in the vertical multi-layer sleeve septic tank of the present embodiment, as shown in fig. 1 to 17, the diameter ratio of the middle cylinder 3 to the inner cylinder 4 is

The diameter ratio of the outer cylinder 2 to the inner cylinder 4 is

Or greater than

So as to meet the requirement of the volume ratio of the three-grid septic tank.

The third concrete implementation mode:

different from the first or second embodiment, in the vertical multi-layer sleeve septic tank of the present embodiment, as shown in fig. 1-17, the inner surface of the bottom cover 1 is provided with a bottom cover outer cylinder fixing ring belt 1a, a bottom cover middle cylinder fixing ring belt 1b, and a bottom cover inner cylinder fixing ring belt 1 c;

the bottom cover inner cylinder fixing ring belt 1c is positioned in the middle area of the bottom cover 1, and a bottom cover inner cylinder ring groove 1c1 is arranged on the bottom cover inner cylinder fixing ring belt 1c and used for embedding and fixing the inner cylinder 4; the bottom cover middle barrel fixing ring belt 1b surrounds the outer ring of the bottom cover inner barrel fixing ring belt 1c, and a bottom cover middle barrel ring groove 1b1 is formed in the bottom cover middle barrel fixing ring belt 1b and used for embedding and fixing the middle barrel 3; the bottom cover outer cylinder fixing ring belt 1a is positioned at the edge position of the bottom cover 1, the bottom cover outer cylinder fixing ring belt 1a surrounds the outer sides of the bottom cover middle cylinder fixing ring belt 1b and the bottom cover inner cylinder fixing ring belt 1c, and a bottom cover outer cylinder ring groove 1a1 is arranged on the bottom cover outer cylinder fixing ring belt 1a and used for embedding and fixing the outer cylinder 2;

the inner surface of the upper cover 5 is provided with an upper cover outer cylinder fixing ring belt 5e, an upper cover middle cylinder fixing ring belt 5f and an upper cover inner cylinder fixing ring belt 5 g;

the upper cover inner cylinder fixing ring belt 5g is positioned in the middle area of the upper cover 5, and an upper cover inner cylinder ring groove 5g1 is arranged on the upper cover inner cylinder fixing ring belt 5g and is used for embedding and fixing the inner cylinder 4; the upper cover middle barrel fixing ring belt 5f surrounds the outer ring of the upper cover inner barrel fixing ring belt 5g, and an upper cover middle barrel ring groove 5f1 is arranged on the upper cover middle barrel fixing ring belt 5f and used for embedding and fixing the middle barrel 3; the upper cover outer cylinder fixing ring belt 5e is positioned at the edge of the upper cover 5, the upper cover outer cylinder fixing ring belt 5e surrounds the outer sides of the upper cover middle cylinder fixing ring belt 5f and the upper cover inner cylinder fixing ring belt 5g, and an upper cover outer cylinder ring groove 5e1 is formed in the upper cover outer cylinder fixing ring belt 5e and used for embedding and fixing the outer cylinder 2;

the deep corruption manhole 5b is positioned in the area surrounded by the upper cover inner cylinder fixed ring belt 5 g; the primary decay manhole 5c and the water inlet 5d are positioned between the area surrounded by the upper cover inner cylinder fixed ring belt 5g and the upper cover middle cylinder fixed ring belt 5 f; the clarification access hole 5a is positioned between the area surrounded by the upper cover middle cylinder fixing ring belt 5f and the upper cover outer cylinder fixing ring belt 5 e;

therefore, the upper end and the lower end of the outer cylinder 2 are respectively fixed between the upper cover outer cylinder fixing ring belt 5e and the bottom cover outer cylinder fixing ring belt 1 a; the upper end and the lower end of the middle cylinder 3 are respectively fixed between the upper cover middle cylinder fixing ring belt 5f and the bottom cover middle cylinder fixing ring belt 1 b; the upper end and the lower end of the inner cylinder 4 are respectively fixed between the upper cover inner cylinder fixing ring belt 5g and the bottom cover inner cylinder fixing ring belt 1 c.

The fourth concrete implementation mode:

different from the third embodiment, in the vertical multi-layer sleeve septic tank of the third embodiment, as shown in fig. 1 to 17, the upper cover 5 is provided with reinforcing ribs to ensure the strength requirement in practical application.

The fifth concrete implementation mode:

different from the first, second or fourth specific embodiments, in the vertical multi-layer sleeve septic tank of the present embodiment, as shown in fig. 1 to 17, the side wall of the inner cylinder 4 is provided with a first through hole 4a of the inner cylinder and a second through hole 4b of the inner cylinder;

the first through hole 4a of the inner cylinder is used for fixedly installing a first conduit 6, and the second through hole 4b of the inner cylinder is used for fixedly installing a second conduit 7;

the height of the inner cylinder first through hole 4a is lower than that of the inner cylinder second through hole 4b in the vertical height, namely, after the inner cylinder 4 is installed on the bottom cover 1, the inner cylinder first through hole 4a is closer to the bottom cover 1 relative to the inner cylinder second through hole 4 b;

the side wall of the middle cylinder 3 is provided with a middle cylinder through hole 3a, and the middle cylinder through hole 3a is used for installing and fixing a second guide pipe 7;

after the middle cylinder 3 is fixedly installed on the bottom cover 1, the middle cylinder through hole 3a is exactly corresponding to the position of the inner cylinder second through hole 4b, and the second conduit 7 can pass through the inner cylinder 4 and the middle cylinder 3.

The sixth specific implementation mode:

different from the first embodiment, in the vertical multi-layer sleeve septic tank of the present embodiment, as shown in fig. 1 to 17, reinforcing ribs 2a are spirally wound on the outer wall of the outer cylinder 2 to improve the bearing capacity of the outer cylinder.

The seventh embodiment:

different from the first specific embodiment, in the vertical multi-layer sleeve septic tank of the present embodiment, as shown in fig. 1 to 17, an upper cover boss 5h is provided on the upper surface of the upper cover 5, and the primary septic tank manhole 5b, the deep septic tank manhole 5c, and the water inlet 5d are all connected to the upper cover 5 through the upper cover boss 5 h; the upper cover inner cylinder ring groove 5g1 and the upper cover middle cylinder ring groove 5f1 are arranged on the inner surface of the upper cover boss 5h, wherein the upper cover middle cylinder ring groove 5f1 is just positioned at the edge of the inner surface of the upper cover boss 5 h.

The upper cover boss 5h is a hollow cylinder with an opening at the bottom end, and the periphery of the bottom end of the upper cover boss 5h is fixedly connected with the top cover body of the upper cover 5; the primary corrosion manhole 5b, the deep corrosion manhole 5c, the water inlet 5d and the upper cover boss 5h are of an integrated structure.

The specific implementation mode is eight:

in a vertical multi-layer sleeve septic tank, as shown in fig. 1 to 17, the top end port of the outer cylinder 2 is hermetically connected with the upper cover 5 by machine welding, and the bottom end ports of the outer cylinder 2, the middle cylinder 3 and the inner cylinder 4 are hermetically connected with the bottom cover 1 by machine welding.

The specific implementation method nine:

what is different from the eighth specific embodiment is that, in the vertical multi-layer sleeve septic tank of the present embodiment, as shown in fig. 1 to 17, clear pipes B5 in the clarification area, sewer pipes B2, clear pipes B3 in the primary septic area and clear pipes B4 in the top ends of the clarification manhole 5a, the water inlet 5d, the primary septic manhole 5B and the deep septic manhole 5c are correspondingly inserted one by one, and are fixedly connected at each joint by a packaging heat-shrinkable band B6;

clear pipe B5, sewer pipe B2, clear pipe B3 of primary corruption district, clear pipe B4 of deep corruption district are drawn to cartridge clarification district respectively in the top of clarification access hole 5a, water inlet 5d, primary corruption access hole 5B, deep corruption access hole 5c, then each seam department encapsulation pyrocondensation area B6, use firing equipment such as blowtorch or hot-blast gun to heat pyrocondensation area B6, pyrocondensation area B6 can produce the shrink after receiving high temperature baking and cramp.

Then, cleaning and maintenance work is performed through the clarifying zone cleaning pipe B5, the primary septic zone cleaning pipe B3 and the deep septic zone cleaning pipe B4.

The installation method comprises the following steps:

the utility model discloses create the vertical multilayer sleeve septic tank that relates and need assemble in advance before using.

When the bottom cover is assembled, the bottom cover 1 is firstly placed on an operation platform, the lower end of the inner cylinder 4 is embedded and installed in the bottom cover inner cylinder ring groove 1c1, and the inner cylinder 4 is fixed on the bottom cover 1 in a plastic welding mode. Then the lower end of the middle cylinder 3 is embedded and installed in the bottom cover middle cylinder ring groove 1b1, and the middle cylinder 3 is fixed on the bottom cover 1 by plastic welding. Finally, the lower end of the outer cylinder 2 is embedded and installed in the bottom cover outer cylinder ring groove 1a1, and the outer cylinder 2 is fixed on the bottom cover 1 in a plastic welding mode. At the moment, the middle cylinder 3 is sleeved on the outer side of the inner cylinder 4, and the outer cylinder 2 is sleeved on the outer sides of the inner cylinder 4 and the middle cylinder 3.

The ideal ratio of the diameters of the inner cylinder 4, the middle cylinder 3 and the outer cylinder 2 is

However, in order to meet the practical requirement in the application, the diameter ratio of the middle cylinder 3 and the inner cylinder 4 can be kept as

The ratio of the diameters of the outer cylinder 5 and the inner cylinder 4 is preferably larger than

In the assembling process, a sealing ring is respectively additionally arranged in a bottom cover inner cylinder ring groove 1c1 and a bottom cover middle cylinder ring groove 1b1 of the bottom cover 1 and sealing rings are respectively arranged between the bottom cover 1 and the inner cylinder 4 and between the bottom cover 1 and the middle cylinder 3, then the inner cylinder 4 is embedded and installed in the bottom cover inner cylinder ring groove 1c1, the middle cylinder 3 is embedded and installed in the bottom cover middle cylinder ring groove 1b1, and the sealing rings are utilized to realize the sealing connection between the bottom cover 1 and the inner cylinder 4 as well as between the middle cylinder 3.

In the installation process, the positions of the inner cylinder second through hole 4b and the middle cylinder through hole 3a are aligned and the heights of the inner cylinder second through hole and the middle cylinder through hole are flush, so that the second conduit 7 can penetrate through the inner cylinder second through hole 4b and the middle cylinder through hole 3a, and the second conduit 7 is installed and fixed; the first conduit 6 passes through the first through hole 4a of the inner cylinder, so that the first conduit 6 is installed and fixed.

The upper cover 5 is arranged above the inner cylinder 4 and the outer cylinder 2 of the middle cylinder 3: in the assembling process, sealing rings are respectively additionally arranged in an upper cover inner cylinder ring groove 5g1 and an upper cover middle cylinder ring groove 5f1 of an upper cover 5, then the inner cylinder 4 is embedded and installed in the upper cover inner cylinder ring groove 5g1, the middle cylinder 3 is embedded and installed in the upper cover middle cylinder ring groove 5f1, and the sealing rings are utilized to realize the sealing connection between the upper cover 5 and the inner cylinder 4 as well as between the upper cover 5 and the middle cylinder 3. Finally, the upper end of the outer cylinder 2 is embedded and installed in the upper cover outer cylinder ring groove 5e1, and the outer cylinder 2 is fixed on the upper cover 5 in a plastic welding mode.

After the installation is finished, the interval area of the inner cylinder 4 is a deep-rotting area A2, and the deep-rotting access hole 5b is communicated with a deep-rotting area A2; the area between the inner cylinder 4 and the middle cylinder 3 is a primary decomposition area A1, and the primary decomposition access hole 5c and the water inlet 5d are both communicated with the primary decomposition area A1; the area between the middle barrel 3 and the outer barrel 2 is a clarification area A3, a clarification access hole 5a is communicated with a clarification area A3,

need carry out the leakproofness test to vertical multilayer sleeve septic tank after the equipment is accomplished, the test procedure is: injecting water into the inner barrel 4, wherein the water injection height is 1/3 of the height of the inner barrel 4, and standing for 2 hours to observe whether leakage exists; injecting water into the middle cylinder 3, wherein the water injection height is 1/3 of the height of the middle cylinder 3, and standing for 2 hours to observe whether leakage exists; then water is injected into the outer cylinder 2, the water injection height is 1/3 of the height of the outer cylinder 2, and the outer cylinder is kept still for 2 hours to observe whether leakage exists or not; finally, the inner barrel 4, the middle barrel 3 and the outer barrel 2 are filled with water, and the inner barrel, the middle barrel and the outer barrel are kept still for 2 hours to observe whether leakage exists or not; if no leakage occurs in the process, the vertical multi-layer sleeve septic tank can be judged to have good sealing performance and can be transported to the site for use.

The construction operation and installation method comprises the following steps:

as shown in fig. 16, during construction and installation, a septic tank placing pit C4 is dug, and then the vertical multi-layer sleeve septic tank is placed in the placing pit C4. The depth of the placing pit C4 is 2-2.5 m usually, and the depth of the placing pit can be adjusted according to actual conditions in special areas.

Then, a communication pit C2 for connecting the residential room with a septic tank pit C4 is dug, a sewer pipe B2 is installed in the communication pit C2, and a toilet bowl B1 is installed above the sewer pipe B2. A toilet bowl B1 is connected to one indoor end of the sewer pipe B2, and a toilet bowl B1 is installed above the sewer pipe B2; one end of the sewer pipe B2 outdoors is connected to the water inlet 5d of the upper cover 5.

The upper end of the clarification access hole 5a of the upper cover 5 is fixedly connected with a clarification area clearing pipe B5 through a heat-shrinkable belt B6. Clear pipe B5 cartridge of drawing in the clarification district is in clarification manhole 5a in the work progress, take B6 suit to heat shrinkage to take the outside of pipe B5 in clarification manhole 5a and the clear district of clarification, then use firing equipment such as blowtorch or hot-blast gun to heat shrinkage area B6, heat shrinkage area B6 receives can produce the shrink after the high temperature toasts and cramps, realize the clear fixed connection who draws pipe B5 and clarification manhole 5a in clarification district. Similarly, the upper end of the deep-rotting manhole 5B is fixedly connected with a deep-rotting-area cleaning pipe B4 through a heat-shrinkable belt B6, and the upper end of the primary-rotting manhole 5c is fixedly connected with a primary-rotting-area cleaning pipe B3 through a heat-shrinkable belt B6. The primary septic zone cleaning pipe B3, the deep septic zone cleaning pipe B4 and the clarification zone cleaning pipe B5 are used for cleaning and overhauling the vertical multi-layer sleeve septic tank.

After the vertical multi-layer sleeve septic tank body and each connecting pipeline are installed, the dug sand is backfilled to a placing pit C4, and a heat-insulating covering C3 is laid at the positions of a primary septic area cleaning pipe B3 and a deep septic area cleaning pipe B4 clarification area cleaning pipe B5 above the ground, so that the heat-insulating function is realized in winter.

The detailed implementation mode is ten:

in the septic process of the vertical multi-layer sleeve septic tank of the embodiment, as shown in fig. 15-17, when in use, the liquid dung and other domestic sewage of a user flow into the primary septic zone a1 from the closestool B1 through the sewer pipe B2 and the water inlet 5 d; when the liquid level in the primary septic zone a1 rises to a certain height, the suspension in the primary septic zone a1 flows into the deep septic zone a2 through the first conduit 6; when the liquid level in the deep digestion zone a2 rises to a certain height, the suspension in the deep digestion zone a2 will flow from the second conduit 7 into the clarification zone A3.

If the liquid dung is blocked in the using process, blocked objects in the tank can be cleaned through a clearing area clearing pipe B5 and a clearing access hole 5a, a deep decomposition area clearing pipe B4 and a deep decomposition access hole 5B, a primary decomposition area clearing pipe B3 and a primary decomposition access hole 5c respectively, if the tank is damaged or has other faults, the tank can be overhauled through the pipelines and the access holes.

In addition, when the liquid stored in the clarification area A3 reaches a certain amount, a user takes the suspension liquid in the tank through the clarification area cleaning pipe B5 and the clarification access hole 5a for irrigating the plants, and the suspension liquid after the liquid dung is fermented is good fertilizer for the plants; meanwhile, when the volume of the liquid in the septic tank is too large in a short time, the excess liquid in the septic tank is pumped out through the clarification area cleaning pipe B5 and the clarification manhole 5 a.

Simulation analysis operation

In order to test the compression resistance of the vertical multi-layer sleeve septic tank after being buried underground, the tank body of the vertical multi-layer sleeve septic tank is analyzed and calculated by means of finite element analysis software ANSYS. In order to simplify the calculation process by combining with actual conditions, the height of the tank body of the vertical multi-layer sleeve septic tank is 1.2m, the diameter of the inner cylinder is 0.55m, the diameter of the middle cylinder is 1m, the diameter of the outer cylinder is 1.6m, and the wall thicknesses of the upper cover, the bottom cover, the outer cylinder, the middle cylinder and the inner cylinder are all 0.005 m. When the spiral beads are provided in the outer tube, the pitch of the spiral beads is 0.05m, the cross-sectional width is 0.05m, and the cross-sectional height is 0.005 m.

The simulation calculation selects PE as the material, and the density of the material in the operation process is 0.95g/cm³The modulus of elasticity is 107MPa, the shear modulus is 37.7MPa, and the Poisson ratio is 0.35.

The density of the soil is related to the mineral composition and organic part of the soil, and is generally 1400-2700 kg/m³The pressure bearing condition of the tank body is verified and tested, so the upper limit of the taking, namely the density is 2700kg/m³And calculating, and setting the depth of the upper cover from the ground surface to be 1.2m after the septic tank body is buried underground. In addition, in order to meet the requirement of heat preservation in winter, the septic tank body is covered with a heat preservation covering with a certain thickness above the ground, in order to detect the compressive strength of the tank body, the covering is taken as backfill, the thickness of the heat preservation covering is 0.6m, and the density is 2700kg/m³. Therefore, the top of the septic tank body bears the pressure of a soil layer with the thickness of 1.8m, and g is 10N/kg.

Calculating the pressure intensity applied to the unit area:

1.8m×1m×1m×2700kg/m³×10N/kg＝48600N/m²＝48600Pa

the unit area of the top of the septic tank body bears the pressure of 48600 Pa.

The backfill soil is generally soft, so the pressure on the side wall of the septic tank body is not large, the pressure resistance of the side wall of the tank body is tested, and the pressure born by the side wall is 48600 Pa.

The analysis and calculation process of the pressure resistance of the vertical multi-layer sleeve septic tank body is divided into two groups, and the test and comparison types are shown in the following graph:

the septic tank body with a flat upper cover and a flat outer barrel side wall is shown in figure 18.

The appearance of the septic tank body with the lug bosses on the upper cover and the flat side wall of the outer cylinder is shown in figure 19.

The septic tank body with a flat upper cover and spiral reinforcing ribs on the side wall of the outer cylinder is shown in figure 20.

The first group of analysis operation results:

the results of the first test set analysis calculation are shown in fig. 21 and 22. The jar body of here test is that the upper cover is the plane to the urceolus lateral wall is smooth. Wherein, fig. 21 is a deformation analysis result after a vertical downward load is applied to the upper cover of the septic tank body, and fig. 22 is a stress analysis result after a vertical downward load is applied to the upper cover of the septic tank body.

The first comparison set analysis calculation results are shown in fig. 23 and 24. The jar body of here test is that the upper cover is equipped with the upper cover boss to the urceolus lateral wall is level and smooth. Wherein fig. 23 is a result of analysis of deformation after a vertical downward load is applied to the upper cover of the septic tank body, and fig. 24 is a result of analysis of stress after a vertical downward load is applied to the upper cover of the septic tank body.

Comparing the results of this group, it can be found that:

the first test group was loaded with a maximum deformation of 0.12157m at the top and a maximum stress at the edge of the top and a maximum stress of 1.4737 × 10 m at the top⁷Pa。

The maximum deformation position of the first comparison group after the load is applied to the upper cover is 0.087759 m; maximum ofThe stress position is at the edge of the upper cover, and the maximum stress is 1.1289 × 10⁷Pa。

After comparison, the first comparison group showed a 27.8% reduction in maximum deformation and a 23.3% reduction in maximum stress relative to the first test group. Therefore, the upper cover lug boss can well improve the pressure resistance of the vertical multi-layer sleeve septic tank body when the top is stressed.

The second group of analysis operation results:

the results of the second test set analysis calculation are shown in fig. 25 and 26. The jar body of here test is that the upper cover is the plane to the urceolus lateral wall is smooth. Wherein, fig. 25 is a deformation analysis result after an inward load is applied to the circumferential direction of the side wall of the outer cylinder of the septic tank body, and fig. 26 is a stress analysis result after an inward load is applied to the circumferential direction of the side wall of the outer cylinder of the septic tank body.

The second comparison set analysis calculation results are shown in fig. 27 and 28. The tank body tested here is a plane with an upper cover and the outer cylinder side wall is provided with a spiral reinforcing rib. Wherein, fig. 27 is a deformation analysis result after an inward load is applied to the circumferential direction of the side wall of the outer cylinder of the septic tank body, and fig. 28 is a stress analysis result after an inward load is applied to the circumferential direction of the side wall of the outer cylinder of the septic tank body.

Comparing the results of this group, it can be found that:

the second test group had the maximum deformation position at the outer cylinder side wall after the application of the load and the maximum deformation amount was 0.067562m, and the maximum stress position at the outer cylinder side wall and the maximum stress was 8.2576 × 10 m⁶Pa。

The maximum deformation position of the second comparison group after load application is located at the upper and lower positions in the middle of the side wall of the outer cylinder, the maximum deformation amount is 0.039919m, the maximum stress position is located at the middle area of the side wall of the outer cylinder, and the maximum stress is 6.8523 × 10⁶Pa。

After comparison, it was found that the second comparative group had a maximum deformation reduction of 40.9% and a maximum stress reduction of 17.01% relative to the second test group. Therefore, the spiral reinforcing ribs arranged on the side wall of the outer barrel can well improve the pressure resistance of the vertical multi-layer sleeve septic tank body when the tank body is stressed laterally.

And (4) analyzing and concluding:

according to the two sets of simulation operation analyses, the compression resistance of the upper cover can be effectively improved by arranging the upper cover boss on the upper cover, the compression resistance of the outer cylinder side wall can be greatly improved by arranging the spiral reinforcing ribs on the outer cylinder side wall, so that the upper cover boss is arranged on the upper cover part of the vertical multi-layer sleeve septic tank body, the spiral reinforcing ribs are arranged on the outer cylinder side wall, and the compression resistance of the tank body in the practical application process can be obviously improved.

In addition, in order to improve the strength of the tank body, the reinforcing ribs of the upper cover are mainly arranged in two maximum deformation areas and a maximum stress area of the upper cover.

Claims

1. The utility model provides a vertical multilayer sleeve septic tank, characterized by: the device comprises a bottom cover (1), an outer cylinder (2), a middle cylinder (3), an inner cylinder (4), an upper cover (5), a first conduit (6) and a second conduit (7);

between bottom (1) and upper cover (5): the outermost layer is provided with an outer barrel (2), a middle barrel (3) is arranged inside the outer barrel (2), an inner barrel (4) is arranged inside the middle barrel (3), the top end ports of the outer barrel (2), the middle barrel (3) and the inner barrel (4) are hermetically connected with an upper cover (5), the bottom end ports of the outer barrel (2), the middle barrel (3) and the inner barrel (4) are hermetically connected with a bottom cover (1), a separation cavity formed between the middle barrel (3) and the inner barrel (4) serves as a primary decomposition area, the inner space of the inner barrel (4) serves as a deep decomposition area, and the separation cavity formed between the outer barrel (2) and the middle barrel (3) serves as a clarification area;

the primary septic zone between the middle cylinder (3) and the inner cylinder (4) is communicated to the deep septic zone inside the inner cylinder (4) through a first conduit (6), and the deep septic zone inside the inner cylinder (4) is communicated to the clarification zone between the outer cylinder (2) and the middle cylinder (3) through a second conduit (7);

set up clarification access hole (5a), degree of depth corruption access hole (5b), elementary corruption access hole (5c), water inlet (5d) on upper cover (5), elementary corruption area between section of thick bamboo (3) and inner tube (4) in elementary corruption access hole (5c) and water inlet (5d) intercommunication, degree of depth corruption access hole (5b) intercommunication inner tube (4) inside degree of depth corruption district, clarification access hole (5a) intercommunication urceolus (2) and the clarification district between section of thick bamboo (3).

2. The vertical multi-layer sleeve septic tank of claim 1,the method is characterized in that: the diameter ratio of the middle cylinder (3) to the inner cylinder (4) is

The diameter ratio of the outer cylinder (2) to the inner cylinder (4) is

Or greater than

3. The vertical type multi-layer sleeve septic tank of claim 1 or 2, wherein: the inner surface of the bottom cover (1) is provided with a bottom cover outer cylinder fixing ring belt (1a), a bottom cover middle cylinder fixing ring belt (1b) and a bottom cover inner cylinder fixing ring belt (1 c);

the bottom cover inner cylinder fixing ring belt (1c) is positioned in the middle area of the bottom cover (1), and a bottom cover inner cylinder ring groove (1c1) is arranged on the bottom cover inner cylinder fixing ring belt (1c) and used for embedding and fixing the inner cylinder (4); the bottom cover middle barrel fixing ring belt (1b) surrounds the outer ring of the bottom cover inner barrel fixing ring belt (1c), and a bottom cover middle barrel ring groove (1b1) is formed in the bottom cover middle barrel fixing ring belt (1b) and used for embedding and fixing the middle barrel (3); the bottom cover outer cylinder fixing ring belt (1a) is positioned at the edge position of the bottom cover (1), the bottom cover outer cylinder fixing ring belt (1a) surrounds the outer sides of the bottom cover middle cylinder fixing ring belt (1b) and the bottom cover inner cylinder fixing ring belt (1c), and a bottom cover outer cylinder ring groove (1a1) is formed in the bottom cover outer cylinder fixing ring belt (1a) and used for embedding and fixing the outer cylinder (2);

the inner surface of the upper cover (5) is provided with an upper cover outer cylinder fixing ring belt (5e), an upper cover middle cylinder fixing ring belt (5f) and an upper cover inner cylinder fixing ring belt (5 g);

an upper cover inner cylinder fixing ring belt (5g) is positioned in the middle area of the upper cover (5), and an upper cover inner cylinder ring groove (5g1) is arranged on the upper cover inner cylinder fixing ring belt (5g) and is used for embedding and fixing the inner cylinder (4); the upper cover middle barrel fixing ring belt (5f) surrounds the outer ring of the upper cover inner barrel fixing ring belt (5g), and an upper cover middle barrel ring groove (5f1) is arranged on the upper cover middle barrel fixing ring belt (5f) and used for embedding and fixing the middle barrel (3); the upper cover outer cylinder fixing ring belt (5e) is positioned at the edge of the upper cover (5), the upper cover outer cylinder fixing ring belt (5e) surrounds the outer sides of the upper cover middle cylinder fixing ring belt (5f) and the upper cover inner cylinder fixing ring belt (5g), and an upper cover outer cylinder ring groove (5e1) is formed in the upper cover outer cylinder fixing ring belt (5e) and used for embedding and fixing the outer cylinder (2);

the deep-rotting access hole (5b) is positioned in the area surrounded by the upper cover inner cylinder fixing ring belt (5 g); the primary decay manhole (5c) and the water inlet (5d) are positioned between the areas surrounded by the upper cover inner cylinder fixing ring belt (5g) and the upper cover middle cylinder fixing ring belt (5 f); the clarification access hole (5a) is positioned between the area surrounded by the upper cover middle cylinder fixing ring belt (5f) and the upper cover outer cylinder fixing ring belt (5 e);

therefore, the upper end and the lower end of the outer cylinder (2) are respectively fixed between the upper cover outer cylinder fixing ring belt (5e) and the bottom cover outer cylinder fixing ring belt (1 a); the upper end and the lower end of the middle cylinder (3) are respectively fixed between the upper cover middle cylinder fixing ring belt (5f) and the bottom cover middle cylinder fixing ring belt (1 b); the upper end and the lower end of the inner cylinder (4) are respectively fixed between the upper cover inner cylinder fixing ring belt (5g) and the bottom cover inner cylinder fixing ring belt (1 c).

4. The vertical multi-layer sleeve septic tank of claim 3, wherein: the upper cover (5) is provided with a reinforcing rib.

5. The vertical multi-layer sleeve septic tank of claim 4, wherein: the side wall of the inner cylinder (4) is provided with a first through hole (4a) of the inner cylinder and a second through hole (4b) of the inner cylinder;

the first through hole (4a) of the inner cylinder is used for fixedly mounting the first conduit (6), and the second through hole (4b) of the inner cylinder is used for fixedly mounting the second conduit (7);

the height of the first through hole (4a) of the inner cylinder is lower than that of the second through hole (4b) of the inner cylinder in the vertical height;

the side wall of the middle cylinder (3) is provided with a middle cylinder through hole (3a), and the middle cylinder through hole (3a) is used for installing and fixing a second conduit (7).

6. The vertical multi-layer sleeve septic tank of claim 5, wherein: and reinforcing ribs (2a) are spirally wound on the outer wall of the outer cylinder (2).

7. The vertical multi-layer sleeve septic tank of claim 6, wherein: an upper cover boss (5h) is arranged on the upper surface of the upper cover (5), and the primary corrosion manhole (5b), the deep corrosion manhole (5c) and the water inlet (5d) are connected to the upper cover (5) through the upper cover boss (5 h); the upper cover inner barrel ring groove (5g1) and the upper cover middle barrel ring groove (5f1) are arranged on the inner surface of the upper cover boss (5h), wherein the upper cover middle barrel ring groove (5f1) is just positioned at the edge of the inner surface of the upper cover boss (5 h);

the upper cover boss (5h) is a hollow cylinder with an opening at the bottom end, and the periphery of the bottom end of the upper cover boss (5h) is fixedly connected with the top cover body of the upper cover (5); the primary corrosion manhole (5b), the deep corrosion manhole (5c), the water inlet (5d) and the upper cover boss (5h) are of an integrated structure.

8. The vertical multi-layer sleeve septic tank of claim 7, wherein: the top end port of the outer cylinder (2) is hermetically connected with the upper cover (5) in a machine welding mode, and the bottom end ports of the outer cylinder (2), the middle cylinder (3) and the inner cylinder (4) are hermetically connected with the bottom cover (1) in a machine welding mode.

9. The vertical multi-layer sleeve septic tank of claim 8, wherein: clear drawing pipes (B5) in a clarification area, sewer pipes (B2), clear drawing pipes (B3) in a primary digestion area and clear drawing pipes (B4) in a deep digestion area are correspondingly inserted into the top ends of the clarification access holes (5a), the water inlet (5d), the primary digestion access holes (5B) and the deep digestion access holes (5c) one by one, and are fixedly connected at each joint through a packaging heat-shrinkable belt (B6); cleaning and maintenance work is carried out through a cleaning pipe (B5) in the clarification zone, a cleaning pipe (B3) in the primary decomposition zone and a cleaning pipe (B4) in the deep decomposition zone.