Plastic inspection Wells,
Plastic check well divided into community with check well and municipal use inspection Wells, should be according to the installation position of inspection well in engineering application, determine the corresponding inspection shaft specifications.
A well,
Inspection shaft should be set 1. Sewage flow slot, chute design specific requirements: slotted sewage check well flow should be 0.85 times with great diameter is flat, the flow of rainwater and confluence system inspection Wells slotted with 0.5 times fill pipe diameter is flat. Chute width at the top of the appropriate maintenance requirements.
2. The rain check well want to slime room, various places have different practices, some area inside the village inspection Wells are not heavy mud chamber; In some areas, who are heavy rain check well mud room, this is a brick inspection shaft; To plastic drainage inspection Wells, because of the small shaft diameter, conventional QingTong inconvenience. So the rules of the road the rain under the Wells must be set heavy mud room, in order to make road debris, larger particles sank in the mud.
3. This article on the pass-through well choose to make the rules. Content from the current national standard specifications for design of building water supply and drainage GB50015 and specification for design of outdoor drainage GB50014 rules. Within the building area, unless the main line to the municipal inspection shaft section is longer, the spacing between general inspection Wells is very dense, connected by straight Wells more convenient.
4. Initial inspection Wells, namely pipe upstream of the first inspection Wells, such as meet the household outlet pipe and tube at the top of the initial inspection well for pipe butt, generally adopt 90 DHS bend such as well; Meet the household such as pipe and pipe is in the starting well bottom elevation is greater than or equal to the difference between the provisions of the critical value, the initial inspection shaft well choose vertical elbow.
5. Connect meet the household rules on the discharge pipe and tube inspection shaft well of the choice. Figure and 5.1.8 5.1.8-1-2 are all meet the household outlet pipe and tube bottom elevation difference is less than 0.3 m under the condition of the selection of Wells, if meet the household outlet pipe and tube for the larger gap in the following inspection Wells, meet the household is tube should be receiving inspection Wells on the shaft.
6. Well with buried pipes connection socket type is determined by the buried plastic drainage pipe, is generally determined by the pipe price factors. The project USES the diameter series of underground plastic drain pipe material are:
De100 ~ 160 buried pipe, generally choose the solid wall pipe, PVC - U plane wall
De200 ~ 450 buried pipe, generally choose the PVC - U double-wall corrugated pipe wall tube or flat wall structure;
Greater than de450 buried pipe, generally choose PE double-wall corrugated pipe wall tube or flat wall structure.
Wellbore,
1. Well with wellbore connection generally there are three kinds of connection ways: (1) the shaft diameter in and the following de315, bonding connection, bonding connection is only applicable to the wall of the solid wall pipe peace wall tube wall structure (perforated pipe). Wellhead socket type for the socket type, adhesive for bonding without the rubber ring. (2) the shaft diameter in and the following de315, can also be used with nest slot socket rubber ring seal, the wellbore is only applicable to solid wall pipe wall peace wall tube wall structure. (3) the shaft diameter in and above de315 available with nest slot and without nest slot socket rubber ring seal, the wellbore is only applicable to wall tube and double-wall corrugated pipe wall structure.
Different kinds of connect well with wellbore besides pipe price factors, wellbore pressure intensity is also important factor.
Manhole covers to choose,
De315 within 1. Green belts and under the covers, the hard PVC covers, hard PVC covers and according to the wellbore pipes with different forms of sealing cap. But green belts de450 may also be set inside and above inspection Wells,, the use of the common road manhole cover, not as a concrete foundation. PVC - U material covers, poor performance, low temperature in cold area should use HDPE material, modified PVC or polymer matrix composites manhole cover. Outdoors most of the rules of the average minimum temperature - 10 ℃, on the basis of PVC -u material below 10 ℃, has the weakness of brittleness and determine.
2. Check the manhole cover is well on the road should choose a protective cover seat covers, prevent the on-board act directly on the shaft, covers the road choice, but also according to the nature of the road through the vehicle with different levels of manhole cover.
3. Because in sewage check inoue all the manhole cover of hard polyvinyl chloride (PVC) with sealing performance, with protective cover for the seat covers its sealing performance, used in ways to prevent harmful toxic gas sewage pipe sends out to the outside world, influence environmental sanitation. Cold area, can cover up the drainage pipe heat preservation effect. Because the sewer design according to 0.5 ~ 0.6 with degrees, not because of the cover to form a "gas" and "air-resistance", sewage pipe gas pipeline system through building ventilation, send out to the roof above the atmosphere, also by building ventilation pipes, air supplement to drainage pipes.
Connect fitting selection
1. The inspection shaft connection pipe is in the application of plastic drainage inspection Wells indispensable element. In order to meet the pipe connection time varying Angle, diameter change slope, needs, such as the procedures listed in appendix C pipe is commonly used, each enterprise can, according to the needs of engineering application development more convenient construction of pipe fittings.
2. Provides architecture how root into the discharge pipe inspection shaft connection ways. Figure 5.5.2 conditional: (1) meet the household outlet pipe and tube bottom elevation difference of 0.3 m, this is the design of the norms, as long as the gap is greater than or equal to 0.3 m, without being limited by the takeover of the Angle of; If less than 0.3 m, it should be used in pipe butt. (2) pipe diameter, only applies to the discharge pipe is less than or equal to de110 pipe diameter. Discharge pipe diameter big, it is recommended that the access to the shaft seat; If discharge root or big diameter, suggest connection mode connection by installation standard.
3. In this article the application of converging tube to make the rules. Narrow strip around converging pipe is suitable for the construction, all kinds of pipeline, buried depth, discharge tube more and not easy to set up inspection Wells. Because meet director for de160, and discharge pipe de110 level at the top of the tube, the import at the tee, so good hydraulic conditions. Even if there is congestion, adopt QingTong amplify the cleaning the mouth of the ground.
4. The rules on the wellbore saddle joint set of requirements.
On the shaft can be at any level, any position according to import pipe diameter hole, equipped with a saddle joint, but the main one is to install the specification parameters. If import tube and flow control bottom elevation difference less than the critical value of installation specification, then transfer to a discharge tube should be with the well tube butt, the critical value is well discharge pipe of well bottom to bridge connecting shaft socket length, plus additional joint pipe bottom to additional joint installation height. Because there are differences between the products of each enterprise should also be determined according to the size of the product samples.
5. The purpose of the provisions of this article is to prevent the settlement of backfill soil caused by the drag force under the damage to the shaft, install the specification through to product pipe axial pressure after finishing.