Polyethylene (PE) Plastic Inspection Chamber is called HDPE manhole inspection. Polyethylene plastic inspection wells are inspection wells made of polymer synthetic resin materials. Generally, general-purpose plastics such as polyvinyl chloride (PVC-U), polypropylene (PP) and high-density polyethylene (HDPE) are used as raw materials, and the parts are formed by winding, injection molding or pressing, and then the parts are combined into an integral component , There are also rare cases in which FRP materials are used to make inspection wells.
Polyethylene plastic inspection wells are mainly suitable for:
1. Building communities are mostly small rain and sewage wells with a diameter of less than 700mm;
2. Municipal engineering, mostly large inspection wells (also known as manholes), the well diameter is generally more than 700mm;
3. Sewage projects of high-polluting enterprises such as chemical and pharmaceutical industries. In addition, for areas with poor water sources, polyethylene plastic inspection wells can be used as water collectors to realize the collection and utilization of rainwater resources.
The polyethylene plastic inspection well is mainly composed of well cover and cover seat, pressure bearing ring, well body (wellbore, well room, well seat) and accessories. Inspection wells with a diameter of less than 1000mm are straight-bore structures composed of wellbore and well base, and inspection wells with a diameter of 1000mm and above are conical structures with a constriction composed of wellbore, well chamber and well base, and the diameter of the constriction is 700mm. Steps are generally set on the wellbore or well chamber wall of inspection wells with a well diameter of 700mm and above for inspection and maintenance personnel to get up and down.
Polyethylene (PE) Plastic Inspection Chamber Manhole Executive Standard
1. European Standard PREN193598.2:2004 "Specifications for Manholes and Inspection Wells for Traffic Sections and Deep Buried Installations";
2. British Standard BS7158:2001 "Plastic Inspection Wells for Drainage and Sewage";
3. Japanese Standard JISA5731:2002 "Recycled Plastic Inspection Wells and Manhole Covers for Rainwater", Japan Sewer Association Standard JSWASK-7 "Hard Polyethylene Inspection Wells for Sewers" and JSWASK-9 "Hard Polyethylene Small Inspection Wells for Sewers".
4. National Building Standard Design Atlas 08SS523 "Plastic Drainage Inspection Well in Building Community";
5. The Urban Construction Industry Standard of the People's Republic of China CJ/T233-2006 "Plastic Inspection Wells for Drainage of Building Districts";
6. The Engineering Construction Standardization Association standard CECS227:2007 "Technical Regulations for the Application of Plastic Drainage Plastic Inspection Wells in Building Community";
7. CJ/T326-2010 "Shanghai Municipal Drainage Plastic Inspection Well".
How to Install Plastic Inspection Chamber Manhole？
There are procedures and methods on how to install and construct PE Inspection Chamber Manhole. Below we will explain in detail.
The well pit should be excavated at the same time as the pipe trench, and the main line of the well block should be on the same axis as the pipe in the pipe trench during excavation. The pit slope is the same as the pipe ditch slope. During the excavation of the pit, the foundation soil shall not be disturbed and over-excavated; if the foundation soil is disturbed, remedial measures shall be taken according to the relevant provisions of the current "Code for Construction and Acceptance of Water Supply and Drainage Pipeline Engineering" GB 50268. For rainwater inspection wells and pits with silt chambers, the depth of the silt chamber should be partially excavated according to the selected specifications. The pit excavation should be based on the selected specifications, considering the offset factor of the main line of the well seat, and the pit wall at the offset end should be flush with the pipe trench.
In areas with high groundwater level or construction in rainy season, drainage and level reduction measures should be taken.
The foundation of the inspection well shall be determined by calculation according to the local geological survey data and the pulling force under the backfill. When there is no data, the construction can be carried out according to the basic drawing of the inspection well. 1. The installation sequence of the connection between the well seat and the pipeline of the inspection well should be installed from the upstream section of the household pipe, installed in the order of well-pipe-well-pipe, and gradually extended to the downstream branch pipe and main pipe.
The construction method of well seat joint and pipeline connection should be consistent with the construction method of pipeline connection of the same type of joint.
The connection between the well seat and the inlet pipe and the discharge pipe needs to be reduced in diameter. When using a different diameter joint, when the diameter of the inlet pipe is smaller than the diameter of the well seat interface, the top of the pipe should be connected flat; when the well seat outlet pipe interface is larger than the downstream pipe , the inner bottom of the tube should be flushed.
When the pipeline adopts variable angle joints or spherical joints to adjust the slope, when its diameter is 315mm, special tools should be used instead of chain wrenches.
The installation of the additional joints should be based on the size of the wellbore and the diameter of the connecting pipes, and special tools should be used to make holes in the wall of the well.
When the groundwater level is high or during construction in the rainy season, when the installation of the pipeline (including the inspection well) is completed (but the irrigation test has not yet been carried out), technical measures to prevent the well body from floating should be taken.
The length of the wellbore shall be the height from the bottom of the socket connecting the wellbore to the design ground, minus the net distance from the top of the wellbore to the ground. When it is difficult to accurately determine the ground or road elevation, the length of the wellbore can be properly reserved.
The wellbore inserted into the well seat should be kept vertical. When the wellbore is plugged, it is not allowed to use a heavy hammer, and a special tightening tool should be used.
Backfill PE Inspection Chamber Manhole
Backfilling should be carried out after the drainage pipeline (including pipelines and inspection wells) has passed the acceptance inspection, and it should be carried out at the same time as the backfilling of the pipeline trenches.
Before backfilling, sand bags, steel drills and wooden supports can be used to fix the well seat and wellbore, and the accumulation of water in the foundation pit and trench should be excluded.
Backfill material: from the base surface of the bottom of the pipe to the trench within 0.5m above the top of the pipe, the backfill materials can be crushed stone chips, sand with a particle size of less than 40mm, high (medium) calcium fly ash, medium-coarse sand or trenches Good quality soil excavated.
The backfill shall not use silt, garbage and frozen soil, and shall not entrain stones, bricks and other hard objects with edges and corners.
When the local maximum frozen soil depth is greater than or equal to 1.0m, within the range of the frozen layer, medium-coarse sand should be backfilled within a range of no less than 100m around the wellbore.
Backfilling should be artificially layered and symmetrical, and its compactness should be consistent with that of pipeline backfilling, and the wellbore should not be displaced and tilted, and mechanical backfilling is strictly prohibited. 1. Before installing the manhole cover, the length of the wellbore should be accurately measured, and the excess part of the wellbore should be cut.
The installation of the manhole cover should be determined according to the nature of the conveying medium of the inspection well, and the sewage manhole cover and the rainwater manhole cover should not be confused.
The upper opening of the wellbore of the sewage inspection well with a protective cover seat should also be equipped with an inner cover.
C20 fine stone concrete is used for on-site pouring and tamping; if reinforced concrete is required, it needs to be designed separately by the structural professional. The closed water test shall be carried out in accordance with the current engineering technical regulations for buried plastic drainage pipelines.
What is the difference between cable well, manhole well, inspection well and working well?
The opening of the inspection well is smaller, as long as the cover is opened, the inspectors can check whether the facilities inside are all in good condition. The manhole requires a larger opening, which can meet the needs of inspection personnel to get up and down, and there is a ladder in the manhole for personnel to go up and down. In addition to meeting the inspection requirements, it also needs to meet the maintenance personnel to enter to maintain and repair the internal facilities.
Manholes are generally used in passable or semi-passable tunnels and channels for laying cables or pipes. When various pipes enter the building through the tunnel or semi-passable channel, manholes should be set in the entry area. It is used a lot in municipal affairs, and there are channels for various cables and pipes. In some cases, a manhole is set at a distance, and the wells are connected by concrete pipes, cables are laid in them, and people can go down the manhole for inspection and maintenance.
What are the commonly used HDPE manhole inspection well sizes?
There are many types of hdpe manhole inspection wells. According to your project, municipal needs, and size requirements, connect the manhole cover, well seat, wellbore, etc. to form a complete rainwater, drainage, and sewage collection system.
The general wellhead dimensions are the following series: 315mm; 450mm; 630mm; 700mm; 1000mm, etc.
Then the general HDPE winding pipes are: 200mm; 315mm; 350mm; 450mm; 630mm; 700mm, etc.
There are many other sizes of various products.
hdpe manhole inspection
What accessories are there for HDPE manhole inspection wells?
HDPE manhole inspection well accessories mainly include: saddle joint, composite manhole cover, reducing joint, variable angle joint, heat shrinkable sleeve, rubber ring, HDPE hollow winding pipe, PVC hollow wellbore, HDPE plastic inspection wellbore and spare parts, etc.
HDPE manhole inspection well sealing ring problem can not be ignored
With the popularization and large-scale application of hdpe manhole inspection, the problems of pipe socket sealing and wellbore pipe socket sealing of hdpe manhole inspection are becoming more and more obvious. Whether its sealing performance is good is also an important indicator to measure the performance of plastic inspection wells. It is also the key to project acceptance.
The connection between the HDPE manhole inspection and the plastic drainage pipe is usually connected by a rubber ring, and in some special cases, a heat-shrinkable tape is used for connection.
1. Commonly used hdpe manhole inspection wells such as HDPE hollow winding wellbore pipe, UPVC hollow winding wellbore pipe, PE wall wellbore pipe and plastic inspection well all use the sealing ring as shown in the figure for flexible socket connection:
Because the outer diameter of the same type of wellbore pipe produced by each manufacturer will be slightly different, in order to achieve sealing performance, a suitable wellbore ring is required at this time. We usually selects according to the size of the plastic inspection well and the wellbore Suitable wellbore ring or directly customized production wellbore sealing ring.
2. The connection between the plastic inspection well and the horizontal pipe of the plastic drainage pipe is different according to the material of the drainage pipe used, and the selected rubber ring is also different, as shown in the figure:
The well blocks of plastic inspection wells are all produced by standardization and customization. As long as the manufacturer, pipe type, and ring stiffness of the buried drainage pipes are different, their inner and outer diameters are different, and the sealing rubber rings that need to be used are also different. It caused a lot of trouble to us in the actual construction process. In many cases, we can only customize the rubber ring.
While exporting manhole inspection wells, in order to better solve the rubber ring sealing problem generated during the installation of HDPE manhole inspection wells, our company has launched a customized rubber ring solution to ensure that the leakage of rainwater and sewage is prevented and the leakage of rainwater and sewage is prevented. The secondary pollution of groundwater contributes to sustainable development.
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