Selection of Routing Location-Hengshui Baoli Engineering Plastic Co., Ltd |Silicon Core Pipe | SinoaecMaterial

Selection of Routing Location

1.Expressway
Normally select the center of expressway central partition. If necessary, select the location between drainages ditch under the shoulder or roadbed and partition. In special situations, it can be poured in concrete percussion wall in short distances.

2.Highway
Normally select the side ditch or shoulder. If the highway will be widened, straightened, or rerouted, select 15m beyond the planned red line.

3.City Streets
Normally select pavement, non-motor lane or greenbelts. If necessary, select the side of the motor lane.

4.Common Areas
Areas with flat ground: slopes hard for soil borrowing or collapse, subside, landslide.
5.Along the Railway Line
Normally select the location 5m beyond the roadbed the railway. If railway departments have special requirements, it should be selected according to the regulations of related design departments.

Excavation of the Groove and Buried Depth
1.General Regulation
The groove should be smooth and straight as far as possible. The groove bottom should be free of of hard ridges and extruded pointed stones and bricks.
Design width of the groove bottom should be dtermined according to the arrangement width of the silicon core pipes. Generally, the width should be about 10cm wider than the arrangement width.
To facilitate the operators to arrange the silicon core pipes in the groove, the minimum width of the groove bottom should not be less than 30cm.
During laying silicon core pipes in expressway partition, the design of buried depth and arrangement width of silicon core pipe should consider the infuences of the installation of percussion guardrail to the silicon core pipes.

2.Buried Depth
Should comply with the following requirements for depth (this depth refer to the distance from the upper surface of the upper layer of silicon core pipes and the the ground).

Number	Laying section and nature of soils	Depth (meter)	Remark
1	Cultivatible areas (ordinal soil and hard soil)	≥1.0	The depth can be designed according to drawing if there are any special requiremnt
2	Gravel soil, soft stone and weathered ston	≥0.8
3	Hard rock and flowing sand	≥0.6
4	Suburb, villages and towns	≥1.0
5	City streets	≥0.8
6	Outside the isolated barrier of expressway and outside the roadbed	≥0.8
7	Shoulder and ramp of the expressway	≥0.8
8	Convex certral partition of the expressway	≥0.6
9	Along the railway line	≥1.0
10	Crossing the railway and highway (from the roadbed)	≥1.0
11	Crossing the ditch, channel and water pool	≥1.0

3.Distance between pipes and other pipe networks and buildings should comply with the requirements in the following table (net distance)

Other Pipelines Types		Parallel (Meter)	Crossing (Meter)
Water supply pipe	diameter ≤ 300mm	0.5	0.15
	diameter 300--500mm	1.0
	diameter＞500mm	1.5
Discharge pipe		1.0	0.15
Hot water pipe		1.0	0.25
Gas pipe	pressure＜294.2Kpa(3Kgf/cm2)	1.0	0.3
Gas pipe	Pressure=294.2—84.55Kpa(3Kgf/cm2)	2.0	0.3
Power cable	Under 35KV	1.0	0.5
Power cable	Under 35KV	2.0	0.5
Drainage ditch		0.8	0.5
Building red line (or foundation)		1.0
Trees	Tree rows	0.75
Trees	Single big trees	2.0
Water well and grave edges		3.0
Cesspit, water accumulation pool, ammonia water pool, biogas pool, etc.		3.0
Soil well and ditch and ridge easy to collapse		5.0
High pressured petroleum and natural gas pipes		10.0	0.5

1.Re-measureing of routing

Before laying and installation, read the design documents in detail, and familiar with drawings. According to the design, re-measure the routing of the silicon core pipes which

need to be laid. Verify the length of the ground, the positions of various barrier points in the routing, the accepting and sending positions of silicon core pipes, the positions of man hose (hand hole) and distance, etc.
According to design and re-measured data, the joints of silicon core pipes should not drop into water pools, river beaches, under roadbeds of railway and highway, and other not suitable place.

· Select the storing place for silicon core pipes.
· Determine the construction scheme and related protective measures.

2. Pipe-disk overhead
During erection, firstly place the pipe-disk on special bracket and overhead it. Before mounting in the bracket, the taking out direction of silicon core pipes should be considered (open ditch laying should be taken out from below, and blind ditch laying is shown in the following figure) to prevent hard laying in the ditch due to inverse bending.
Note: silicon core pipes without disk package should be installed on movable disk bracket, and then the laying can be conducted.

3.Open ditch laying

Fix the bracket with pipe-disk on initial ground or stopped moving trailer. Draw out the external end of the silicon core pipe from the pipe-disk. Pull its end and walk straightly along the groove direction (to prevent the silicon core pipes from wearing while moving on the ground, add one person in every 30m to lift the silicon core pipes). After the whole disk of pipes is released, straightly place the silicon core pipes in the groove.

4.Sub-pipe will be placed in other pipes with large diameter. In this case, silicon core pipes should be drawn out from above the shaft disk, and enter the pipes in correct direction, as shown in the following figure.

If many silicon core pipes are placed in one pipe with large diameter, they should be entered at the same time, and traction cable traction net should be used.

5.Hanger on the bridge

50×5 flat iron can be used to manufacture U shape frame. Places in every 2m should be fixe on the bridges or percussion wall by expansion bolt. All silicon core pipes should be protected by steel pipes (that is insert the silicon core pipes in steel pipes). Detailed method will be determined by the design.

6.Laying of plowing plow

This laying method can be applied in long distance, flat ground and relatively soft sol areas (expect the paddy ground and flowing sand ground). Excavation, pipe laying and backfilling can be finished in one time by using this method. Thus time and labor will be saved. Because special laying machines will be used in this method, so detailed introductions will not be introduced here.

7.Arrangement of the silicon core pipe

After placed in the groove, the silicon core pipes should be arranged in order and straightness. Slightly curve of the silicon core pipes in the groove will adversely affect the cable blowing.