LESSO

Plastic Inspection Chamber (Type I)

ABOUT LESSO

China Lesso Group Holdings Limited (Stock Name:China Lesso,StockCode:02128.HK)is a large industrial groupof home furnishings and building materials in China.China Lesso's businessportfoliospansplasticpiping,building materials and home furnishings，environmental protection，new energy， supply-chain service platforms and others. It offers products such as pipes, photovoltaics,plumbing and sanitary ware,integralkitchenmaterials, integral doors and windows，aluminum formwork and smart scaffolds,waterpurifiers,water-proofing materials and sealants, fire-fighting equipment,valves,cables,lighting,hygienematerials, itemsforenvironmentalprotection,agriculturalfacilities,andoceanicaquaculturecages.ItssalesrevenuehasreachedRMB30.767 billion in2022.

Withtherapiddevelopmentofinternationalizationand globalization,China Lessoboasts more than 30 advanced productionbasesdistributed in18provinces acrossChina,and insome foreigncountries.China Lessoremains committed to improving its strategiclayout,broadeningits sales network andexpanding the market.This ishow it provides products and services for customers in a timelyandefficientway.

Asa domesticmanufacturerofextensivehomefurnishings and building materials,China Lesso provides over 10,oo0 varieties of products withall specifications.Its products are being widelyused in many areas,including home decoration,civil construction,municipal water supply，drainage，energy management,power supply and telecommunications,gassupply,fire-fighting,environmentalprotection, agriculture,oceanicaquaculture,andmore.

True to its slogan of “Envisioning theBetter,Building the Future” China Lessowillhonoritspromiseof creating a healthy,enjoyable,and sustainableenvironment.The Groupremainscommitted to improvements inurbanconstructiontocreate betterplaces to live.With concerted efforts from various sectors,Lesso willfully play its role in buildinggreen,livable,andefficientcitiesso thatpeoplecould enjoy healthandhappinessanytimeandanywhereintheircitylife.

CONTENTS

1. Introduction to the product 01-02
2.Production equipment 03-04
3.Effective elevation of 05-06
inspection chamber
4.Test equipment 07-08
5. Product comparison 09-10
6.Productcharacteristics 11-12
7.Product performance 13-14
characteristics
8.Research,development 15-22
and design
9.Product series
LSPM trough chamber series 23-27
LSPMSilt chamberseries 28-30
Valve chamber series 36-38
Greasydirt separationwell series 39-40
Purification tankseries 41-44
Communicationcablewell series 45-46
Accessory series 47-56
10.Product construction 57-56
11.Project cases 59-60

1 INTRODUCTIONTOTHEPRODUCT

With the rapid development of China's economy and the fast expansion of the city's scale,the underground pipelines of urban infrastructure has graduallyaracted peoples attention.Torrentialrainshavecaused flooding in numerous cities,which has led tocalls forspeedingupthe transformation ofurbanundergroundpipenetworks.

Among underground urban pipe network of cities in our country,the pipeline is plastic material in the main.But the inspection chamber adopts brick work and concrete structure.It is hard to obtain complete sealing for connection between two types of different materials in underground pipe network. In addition, uneven sedimentation willtake place between the chamberand drain pipes.This often causes water leakage at the connection of the chamberand pipes and polluites urban underground water. It is more serious that at the water leakage the water flow will take away sand to form hallow cavity,whichmaycauseroad surface tosink andproduceserioushiddentroubleforurbansafety.

After research and experiment formany years,LESsO has launched standard plastic inspection chamber products.The plastic inspectionchambermay form a leakless pollutant and drainpipe system with buried plastic water drain pipes,whichresolves the problem limits development of urban undergroundpipenetwork.

LESSO plastic inspection chamber is made up of bottom chamber base,casing pipe and load bearing cover,etc.The bottom chamber base is made with use of polymerresin material through one-time injection molding.Thewellhole and casing pipe is fabricated with use of extrusion and winding technology.The height adjustment is convenient and reliable.It isprovided with better interchangeability and overall structure.

Urban and rural areas

Residential area

Industrial Park

Reconstruction of old city

The inner wall of LESSO plastic inspection chamber is smooth,flowrate and flow speed are better than traditional inspection chamber and is not easy to block.The pipes and plastic inspection chamber adopts rubber sealing rings for flexible connection.The sealing performance is good.the chamber and the pipeline same settlement does not leak.The plastic materials have good acid and alkali corrosionresistance and long service life.In addition, LESsO inspection chamber has the advantage of small excavation area, saving time and labor, free of influence of rainy days, great increase of constructionefficiency.

Theuse ofplastic inspection chambermayreduce useof red bricks,which isfavorable toprotect the soil,eliminate leakage of sewage,helpful for protection of underground waterresources.Therefore,the application of plastic inspection chambernot onlyhas good economic benefit but also has positivesocialsignificance.

2 PRODUCT EQUIPMENT

PVC-U hollow pipe

1. The design of adoption of double-layerhollow wellhole cansave a great number of rawmaterials and meet therequirementstoenhancethenominal ringstiffnessof thechambermaximally. 2.The hallowwellhole through injection molding can determine the length arbitrarily.At the time of construction,the length maybecutonthesiteaccordingtotheburieddepthof thewellhole,which isflexibleandconvenient. 3. As wellhole with hollow wall is integrated, holes may be drilled at any position and angle of the wellhole. 4.Wellhole specification: Φ200, Φ315, Φ400, Φ450,Φ500, Φ600, Φ630, Φ700 and Φ800.

EFFECTIVEELEVATIONOFTHE INSPECTIONCHAMBER

The elevation of plastic inspection chamber of the silt settling pit

TESTING EQUIPMENT

LESSO has perfect testing equipment for plastic inspection chamber

Falling weight impact test for plastic inspection chamber

Dead load test for plastic inspectionchamber

Shearforce test forbranch pipes of plasticinspection chamber

Force analysis for plastic inspection chamber

PRODUCTCOMPARISON

LESSOPLASTICINSPECTIONCHAMBER

Energy Saving and Eco-friendly，Fast Installation，Anti-seepage and Anti-corrosion

PRODUCTFEATURES

7 LESSU CT PHCTACTERISTICSRF

No seepage, sealed connection between pipes and the chamber.

Convenient
transportation
Quick construction
speed

Resistance to corrosion of acid-alkali medium

The connectionmode of plastic inspection chamber is flexible connection.flexible connection, good sealing property,effectivepreventionof sewage leakage,avoiding secondarypollution of groundwater，safety and environmental protection.The pipe soil and chamber soil move together and sink uniformly,which solvestheproblemofdifferential settlement produced between connectionoftraditionalbrickchamberand plastic pipe and canprevent surface collapseeffectively.

Theplastic inspection chamber is light in weight so that it is easy to carry and install inplaces such as construction,andsolves theproblem of heavy and inconvenientinstallationoftraditional brickchamber andreinforcedconcrete inspection chamber，thus solve the installation speed of construction.It is 30 timesquickerthattraditionalbrick chamber.

The inner wallof plastic inspection chamber is smooth,which will notkeep swage.Therawmaterialsused forplastic inspection chamber containsPVC-U and isprovided withthefunctionof resistance to acid and alkali so that the service life of plasticinspection chamberisextended.

Convenient to clean the pipes Small maintenance quantity

Small covering
area
Small excavation area

Good economic performance and usability

Itis convenient toclean plastic inspection chamber anddo notneed to clean broken stones,bricks and other sundries.It can prevent pipe clogging caused by rain water and sewage and can change the problem that traditional brick chamber andreinforced inspection chamber is easy to get serious clogging.The width at the topof the trough should meet therepair requirements.Insidetheinspection chamber, step is set at the top of trough to make it convenient for maintenance.With increase of pipe and chamber depth，the width still need tobe increased.

Theplastic inspection chamber is eco-friendly, energy saving,land saving, watersaving,materialsavingand recyclable so that it is in line withnational policyofsustainabledevelopment.

8 RESEARSIG,DEVELOPMENT

Sewageinspectionchambersystem

Sewage inspection chamber is the auxiliary structure used for sewage drainage pipes and for inspection and removal of foreign body by maintenance personnel.It is necessary measures foregular inspection and dredging pipes and preventing pipe clogging. The plastic inspection chamber uses high polymer resin as raw materials and adopts combined structure and is made up of bottom chamber base, wellhole, chamber cover, cover frame and concrete supporting plates. The key parts, bottom chamber base, are fabricated with use of one-time injection molding. Reducing joint and seal ring and other accessories are used to change pipe diameter and angle connection.The load on the road acts on the surrounding area of the inspection chamber through chamber cover and bottom chamber base to avoid damage to the inspection chamber by road load. The retainer ring can float upwards and downwards to adapt to the change of road level. In addition, the wellhole adopts hollow wall PVC pipes, HDPE winding pipes as special chamber.The corresponding length may be cut according to actual burial depth and has great flexibility.The rubberseal ring flexibleconnection is used forconnectionbetween the wellhole,waterinlet(outlet)pipes and bottom chamber base.lt canbe suitable for inner angle change within a small scope.The construction is simple and quick withgood sealingperformance,effectivelyprevent leakage,eco-friendly and energysaving.

The inspection chamberis usuallyset at intersection,bend,pipe diameter or slope changes,drop chamber and a certain distance on the straight line.The maximum spacing is different from 30 meters to 100 meters according to the size of connection diameter.For the same connecting pipe diameter,the spacing of sewage inspection chamber is10 meters shorter than that of rainwater inspection chamber.The spacing is determined according to design codeforoutdoor drainage for concrete condition.

System diagram of sewage network pipes

Good sealing performance, prevention of seepage, eco-friendly and energy saving.

Rainwater collection system

Rainwater,a valuable resource,is managed and utilized sufficiently through the collection,management, utilization and bioremediation.The utilization of rainwater not only solvespartial water logging,utlizes and save resources but alsoprotect the environment.The collectionand utilizationofrainwater canrelieve twomajor contradiction of short term of wateruse,seasonal rainwaterinundation.Thisnot onlysaves watersourcesbut also reduces theburden of urban drainagefacilities.LESSObrandrainwatercollection chamberis divided intoforward collection and side collection in the form.It maybeproduced according todesignrequirement and can alsomeet serialconnectionand installationanduse.

The special plastic inspection chamber series

I. Application of convergent wellhole

1.1. The drainage pipes are two pieces or less with pipe diameterlessthan160mm.Thedifferencebetweenpipebottom elevation andpipetopelevationof theservicepipesislargerthan 0.30m and the spacing is small.

1.2The drainage pipes are four pieces or less with pipe diameterlessthan160mm.Thedifferencebetweenpipebottom elevationandpipetopelevationof theservicepipesislargerthan 0.30m.When the pipe spacing is limited,the convergent wellhole maybeusedandisconnectedwithstraight-throughbottom chamberbaseinseriesupand down.

Il . Application of convergent bottom chamberbase:

2.1. The drainage pipes are three pieces or less with pipe diameter less than160mm.The difference betweenpipe bottom elevation and pipe top elevation of theservicepipesis less than 0.30m.When the pipe spacing is limited, the convergence joint may be used to merge the flow. Then it is connectedwithTeejointbottomchamberbase.

2.2. The drainage pipes are more than two pieces with pipe diameter less than or equaling to 160mm.The covering depth is not less than 0.70m and there is no way to set the starting chamber.It is suitable to set convergent bottom chamber base:(Wherein, the branch pipe type includes two-way joint, Tee Joint, four-way joint and five-way joint).

Drop chamber series

It isset at the inspectionchamberwhere theelevationofwaterdrainagepipereducessuddenly.Inthechamber,the upstreamwater flowfalls to the lower placefrom high place and then flow away.Soit iscalled dropwell.Compared with common inspection chambers, it is necessary to remove the energy of dropped water.The energy magnitude is determinedbyflowrate and thedropheight.The structure of dropwell hasdifferent design.lIt is subject to themeasure to eliminate the energy.The structure at dropwellbottom isfirmer than common chambers.

LESSO brand drop chamber may be selected according to actual drop height and divided into wellhole with opening series drop well,top and bottom elbow series drop chambers.

Note: "-" indicatesthewaterflowdirection.

In the design drawings, if two inflow pipes form 90° angleand these two pipesform135°angle with outflow pipes,Y shape inspection chamber shouldbe selected to meet the application of network ofdrains.

120° Tee joint bottom chamber base (trough chamber) I

In the design drawing,the angle of branch pipe is 120° the chamberselects 120° Teejoint bottomchamberbase(troughchamber)I.The diversion trenchof bottom chamberbase is clear.

PRODUCTSERIES

Valvechamberseries

Introduction to the product

The valve well is set for the convenience to use valves of undergroundpipeline andpipes toopen andclose operationofsome pipenetwork or repair operationwhenit is necessary.Thevalve is placed into thewelltomakeit convenient forregularinspection,cleaning and pipeline dredging and preventing pipe clogging. The water meter chamber is set inside the chamber for underground pipelines and piles in order to make it convenient forreadings,inspection,cleaning of water meters.The type of chamber is called watermeter chamber,which is showninthefigure.

Product characteristic

The traditional brickchamberismadewithsinteredsolidbrickswithcementplaster.Thereinforcedconcretechamberismadewithreinforcedbarand cement casting.The brick chambers and reinforced concrete chambers are provided with common sealing property and are weak to corrosion of acidic-basic materials.As theybelong to rigid structure, the loading capacity is better.But in case of soil settlement and geological disaster,chamber collapse mayoccur LEssOplastic inspectionchamber,watermeterchamberare inspection chambersmade of highpolymerresin and takestheplaceof red bricks andcement. Hightemperatureandhighpressuremeltstherawmaterialswithhighpressureinjectionmolding.Forconnectionbetweenplasticvalvechambers,watermeter chambers and pipes andwellhole,flexible connectionisobtained withuse of rubberrings and thermal shrinkablesleeves.It featureshigh safety,good sealing propertyandcanobtainequalsettlement topreventwaterleakageandseepage.Rainwaterandaccumulatedwaterwill notseepintothechambertoavoid damage tocast valve,water meter and its service life or function.Its advantage isshown in the figurebelow.

Application cases

Introduction to the product

Remark: square valve well, water meter chamber and valves of other specification maybecustomized.

Valvechamberseries

Product application

Theoveralleffectofplasticvalvewellandwatermeterchamber

INTRODUCTION TO THE PRODUCT

With social development,the oilinvades into water body to form oil-containing waste water. Oily wastewater has wide sources and is mainly from Industrial production and human life.The oilywastewater is discharged into urban pipe network along with domestic wastewater. lfit deposits and hardens in the pipes for a long time, it will cause serious clogging of pipes.lf domesticwastewatercannot be discharged intowastewater treatment factory, it will bring large influence on human life.According to requirements of relevant departments, dining room, catering facilities must be buit with oil separation wells or isolation pools to separate oil and water to avoid long-term accumulation in the pipes toblock the pipes.But at present,most oil separation wells are traditional brick wells.The construction speed is slow.In addition,the oil separation effect is not ideal due to the materials and construction reasons,LESso Company develops oil stain separationwellsforsuchconditions.

PROJECT CASES

Isolatevegetableresiduefromchickendirectlywithuseofbasket.

Oil separation effect

O Greasy dirt separation well series

PRODUCT CHARACTERISTIC

LESSO plastic oil stain separation wells are made of resin materials with use of high pressure injection molding. The assembly is simple and saves labor and time. The more important thing is that plastic materials are acid and alkali resistant.Withsmooth innerwalls,oil and wateris separated reasonably.The oil separation effect is above 90% The oil from domestic wastewater is collected in the well to make it convenient for cleaning in the future.

PRODUCT SPECIFICATION

Remark:thegreasydirtseparationwells of otherspecificationmaybe customized.

INTRODUCTION TO THEPRODUCT

The purification tank is a type of small domestic wastewater treatment device.The product is applicable to rural transformation, urban villas and places where it is not suitable to pave underground pipe network. The product is easy to installand there isno cost for wastewater treatment.Thetreated waterqualitycanreachthestandard with small maintenance cost and long service life.The unpowered purification troughdoes not need electric power. The domestic wastewater is filtered，precipitates and decomposed through microorganism,etc to reach the standard.

FLOW CHART:

INTRODUCTION TO THE PRODUCT

1.No use of electric power.Carry out treatment for domestic wastewater.It does not use blowers or water pumps and other powers. The water circulating movement of wastewater in the purification tank is only used. The wastewater is purified with use of microorganism.
2.The investment is small for installtion of purification tank.In some remote area or dispersed areas,the cost to construct underground wastewater pipeline is high and the utlization value is low.It needs to excavate a large area of land for pavement of underground pipelines,which will waste land resources. The excavation area is small for installation of purification tank, which willsave land resources. The cost for underground pipeline pavement may also be saved to discharge the wastewater locally or achieve the benefit of useof recycled water.
3.The traditional wastewater treatment method needs to transport wastewater to wastewater treatment factory through underground pipelines. The treatment cost is large with high operation cost. The purification tank may achieve operation of single household without operation cost.
4.The local treatment can obtained good treatment effect. The wastewater reaches the standard after precipitation,fitration, and decomposition of microorganism to obtain local discharge and use of recycled water after treatment.
5.The installation is free of influence of terrain and takes a short time to see the effect. The site with the size of a car is needed for installation of family small purification tank. The drain pipes connecting the purification tank is very short and the requirement for installation is not high.It usually takes a week to install a purification tank. Once the purification tank begins to operate, the function to treat wastewater will work immediately.

PRODUCTSPECIFICATION

Purification tank series

TECHNICAL PARAMETERS OF PURIFICATION TANK

PRODUCT APPLICATION

PRODUCT APPLICATION

Purification tank series

Introduction to the product

Withquickeconomicdevelopmentand quickened step of construction of urbanization, the traditional communication cable structure is weeded out gradually and switches to underground pipe network.The investigation shows that among the communication pipe network,the pipe is dominated with plastic materials and the well still uses brick structure.Connectionbetween two different typesof materials is not easyto obtain complete sealing.It is easy to find seepage and other phenomenon such assedimentationcaused by unevenforce，raised well cover, well body collapse, etc. in some remote mountainous area,due to materials factors of brick wells,high transportation cost, complicated installation,large difficulty for later maintenance and repair may take place.In addition,there is shortcoming such as long construction period, weather influence on construction， high cost for maintenance in later period and short service life.For such condition,LESSO Company has made special study and takes the lead to launchcommunication cable well.The communication cable well is made through one-time injection molding with use of PPB and consists of chamberseat,elevating modules, telescopic sleeves， adjustable supports, hanger bracketsandrelevantaccessories.

The advantage of plastic communication cable inspection chamber

1.Quick installton:thebrickwelltakealotof timeInadditionasthecementneedsmaintenanceandcuringit taesseveraldaysforhandholetreach the acceptance standard. After that, optical cable construction is carried out. After PPB wellis placed into the pit, it may be backiled and completed within 2 hours. Theconstructionof optical cablecanbemadeat once.

2.Themodular structureisconvenient forconstruction:incase of raised orlowered road surface,thebricklayersof the constructionunit arerequired for bricklaying or dismanting bricks to level with the road surface.The maintenance time is still needed.PPBwell is provided with 25cm telescopic wellring to adjust the height and can rise and lower with addition of a 2ocm module If it is to lower, use electric saw to cut the exceeding part. The construction can be completed inthecurrent day.

3.One-time molding to avoid quality problem and more standard: the construction quality of brick well depends on the level and sense of responsibility of construction unit. The jerry-building may appeardue to sufficient cement mark. Aftera long time of use, thecement well with bad construction quality willsuffer falingof cementManuallasteringwilrequireBwellimade throughnetimemolding andcanresole theproblemsof jerybuildinghere isnnedfor plastering and withoutmaintenance lifelong.

Product materials:

LESSO communication cable inspection well is made of PP copolymer (PPB).It has the following characteristics: 1.Non-toxic,tasteless,good strength,rigidity and hardness and super than HDPE.
2.Except corrosion of concentrated sulfuric acid and concentrated nitric acid, it is stable to all types of chemical agents. 3.Good heat resistance,with melting point of 164-170°C,it will not deform at 150°℃.
4.The excellent low-temperature toughness. The brittle temperature of PB is -35°℃C.
(Innortheast region,PEmaterials areused,thebrittle temperature is-7o°℃.)

Product application

Applicable scope:
Residential area
Municipal road
Expressway
Communication base station

\circ Communication cable well

Application cases: