Construction principle

1) Preconceived, then branches, deep and shallow, and the construction of the branch pipeline should be carried out after the construction of the structure.

2) The tube trench adopts mechanical excavation (manual cooperation, the base leaves 200mm thick artificial clearance), the slope of the pipe ditch is 1: 1, and the groove depth exceeds 4m. The reserved width with a width of 1.2m is reserved to excavate. Small tube guts are artificially excavated.

3) Check and test before installing the valve and inspection well.

4) The double -wall ripple tube adopts an inheritance interface. When a single -port connection cannot be used, the dual -port connection can be used. The sleeve is made of PE, FRP or stainless steel material.

5) Before the construction of the double -wall ripple tube, the tube trench needs to lay a layer of 200mm thick sand cushion layer, and the compaccism needs to reach 85%to 90%. When the double -wall ripple tube is returned to the construction, the medium coarse sand should be used to fill the dense. The scope of the backfilling range shall not be less than the design support angle 2α+30 ° (180 °).

6) The connection between the double wall ripple and the inspection well can be connected or flexible.

Rigid connection: When checking the well, the tube or short tube is embedded in the well wall. When using this connection method, cement cement should be full.

Flexible connection: Stay on the prefabricated concrete ring beams with the laboratory on the inspection well. There is a certain gap in the inner diameter of the ring beam and the outside of the pipeline. Uniform settlement and deformation requirements between pipelines.

Construction process

Positioning measurement —– excavation —– pipe ditch, well room construction —– pipe ditch, well room inspection — pipeline construction — test — backfill

Before construction, the experimental personnel should conduct quality and intensity inspection of the materials, and perform pressure inspection of the groove; check the welding welding, the direction of the pipeline, the elevation and slope during construction; Perform pressure test. When adopting the pipe provided by the supplier, the supplier’s pipeline name, specifications, unit price, inspection and test report and other data reports should be approved.

Material management

1) Material inspection

All materials must have relevant documents such as qualified certificates and warranty books, and their materials, models, and quality shall meet the provisions of the bidding documents. The quality insurance materials are strictly implemented in accordance with the requirements of the construction specifications.

a. Tube accessories should be reviewed and checked in real objects before use;

b. The appearance inspection is not qualified and cannot be used;

c. Materials must have relevant documents.

2) Inspection and management of pipeline and pipeline composition

a. Before accepting and using the pipe, the quality certification documents should be reviewed and checked in real objects;

b. Before the use of pipeline composition, check the appearance for inspection.

c. Other special steel composition inspections, such as nuts, nuts, flanges, sealing pads, etc.

Measuring the line

1) Based on the construction drawings, the pipeline is located, and the trench excavation is carried out after re -testing.


2) After excavation of ditch, measure the elevation of the tube ditch to measure, and it can be used as a pipeline foundation after confirmation.

3) Before the lower tube, review the coordinates, elevation and slope of the installation pipeline. It is installed after confirming that there is no error.

1 tutor excavation and measures

1) To first understand the underground conditions of the excavation area, when there are unknown objects such as cables and pipelines underground, mechanical excavation is strictly prohibited.

2) According to the soil quality of the tube ditch, the slope of 1: 1 is left on both sides. Earthquake excavation must be consistent with the design conditions and follow the “

The principle of slotting support, first support and then digging, layered excavation, strictly prohibit super excavation “principle


3) When using a mechanical excavation tube, the dug out of the earth is used to transport the residue field outside the field with dump trucks. A small part can be used as a earthwork backfill. Local, the rest of the earth are transported and returned when returning.

4) When the mechanical excavation soil is close to the design base height of 200mm, artificial excavation should be used to design the elevation. If you are overwhelming or disturbing, you should replace 10-15mm natural sand with gravel or 5-40mm of gravel, flattening and consolidation.

5) The construction of the pipeline is strictly in accordance with the design requirements. Before installation, all pipelines should be reserved at the bottom of the ditch.

6) If the tube trench excavation depth is greater than 4m, the steel plate support should be made on both sides of the tube ditch, and the necessary detection and protection of the groundwater level and the surrounding environment should be performed.

7) The pits artificially excavate 300mm × 300mm drainage ditch. The stagnant water should be discharged in time.

Moving submersible pumps must use hemp ropes

, Do not use a strong conductive rope such as wire.

8) The protective rod should be set immediately after the foundation pit is excavated. The height of the guardrail should not be less than 1.2m, two horizontal rods, set a warning sign, and the fence is more than 1m from the pit.

9) The coincidence of the civil engineering project shall be reserved to reserve the pipe trench at the bottom of the pipeline at the bottom of the pipeline.

Base treatment and basic laying

1) After excavation of the tube slot, it is found that the base and soil quality is soft and the bottom is not uniform. The supervision units and design units will determine the handling measures and sign the design and negotiation records. The base is strictly prohibited from digging. If necessary, it can be filled with sand. When the foundation needs to be changed, it should be cleaned thoroughly, and the filling materials, operation methods and quality standards should be determined according to the specific situation. After the base is consolidated in accordance with the design requirements, the pipeline infrastructure is performed according to the design requirements.

2) After the base is consolidated, spread the 200mm thick sand cushion layer directly at the bottom of the groove. For ordinary soil quality, when the local base load feature value is FAK ≥ 80kPa, the base can be laid in thick sand; the local base soil quality has a poor local base load feature value of 55≤fak <80kPa or the bottom of the groove is under the groundwater level. The base layer of the sand with a thickness of not less than 200mm can be paved in two layers. The lower layer is gravel with a particle size of 5 to 40mm. FAK <55kPa, or when the foundation of the foundation soil is disturbed and affects the ground -based load, the foundation must be reinforced first. After the prescribed base bearing capacity is achieved, the coarse sand base layer is laid.


The lower tube is based on the safety of construction and the convenience of operation. According to the proficiency, pipe weight, length, construction environment, depth of the construction, grooves, and lifting equipment supply conditions of the workers’ operations, the lower tube methods are reasonably determined. The key to the lower tube is the security issue, and the experience must be conducted by an experienced worker. When the lower tube is tube, a reliable script needs to be used to stabilize the ditch. It must not collide fiercely with the groove wall and the bottom of the groove. Two hanging spots should be set up when hanging. The stations are strictly prohibited under the pipe; when manual tube, the staff in the groove must avoid the position of the lower tube. When the lower tube, the groove must be thoroughly inspected, including the base of the base, the mixed objects of the base, and the stability of the groove.

Pipe installing

HDPE double -wall ripple construction: After the sand cushion layer is consolidated, it can start installation. The double -wall ripples require the appearance and color of the appearance, smooth and smooth inner wall, and the tube must not have cracks. The continuous defects of the ripple must not exceed 2. Vertical, axial direction must not have obvious bending; in addition, the pressure and stiffness of the tube should meet the design requirements. The installation of the double -wall ripples should be streaming in the water flow, and the promotion direction is in the direction of the water. Pipeline installation can be installed manually. When installation, the workers are passed on to the bottom of the tank at both ends of the pipeline. The tank body is greater than 3m or the pipe diameter is greater than 400mm. On the tube. It is strictly forbidden to use metal ropes to hook the pipe ports at both ends or roll the pipes from the side of the groove into the groove. The adjustment of the pipeline can be cut with a hand saw, but the section should be vertically and flat. When interface operation, first clean the socket, put on the rubber ring, check whether the rubber ring is well matched, and apply the lubricant to place the center of the socket on the central axis of the latter to the central axis and slowly connect. It is strictly forbidden to use construction machinery to forcibly push the top tube insertion. If the pipeline is severely damaged during the construction of the pipeline, it is necessary to pass the professional inspection, and it can be continued to be used if it is inspected. If the damage is not serious, it can be repaired before using it.


1) Check well: Rectangular concrete rainwater well, the spacing is about 40m equipped with heavy type φ700mm ball, ink cast iron manhole cover and well ring. The cover should be identified as “rain” or “dirt”. During construction, first use the C10 concrete to pour the 100mm cushion concrete. After reaching a certain strength, start tie, form an mold, and pour the bottom plate and well wall with C25 concrete. The flow tank is made of M7.5 cement mortar MU10 brick, and 1: 2 waterproof cement mortar surface is wiped with a thickness of 20mm. The pulp and triangular ash are 1: 2 waterproof cement mortar. The well tube is a prefabricated concrete manhole tube. The installation of the manhole cover and the well seat should be kept level. The manhole cover and the pavement are flat at the intersection. For the specific installation method, see “06ms201-3”.

2) Falling well: When the water falls is greater than 2.0m, the water fell well is required.

3) The door well and outlet: The rainwater pipeline system has 5 water outlets, 2 into the bright canal, and three are discharged into the water near the nearest water. The door is generally built with the outlet, and it can also be set in the door of the door of the outlet to facilitate the maintenance. When shooting the door well, the cushion concrete must be poured first. The cushion is poured with C15 concrete. After reaching a certain intensity, the vertical mold is carried out. Among them, the door and flange must be preserved, and the STIC preservatives are used, and each oil is three layers of oil.

Closed water experiment

1. Try to close water: After the pipeline construction is completed, the water closed test is performed in a timely manner, and the pipeline is filled with water and soaked in 2-3 days and nights. When the upstream of the test section is designed without exceeding the inner wall of the pipe top, the test water head should be used in the test section. The inner wall of the upstream tube is added with a 2M meter; when the upstream of the test section is designed to exceed the inner wall of the pipe top, the test water head should be designed with a 2M meter with the test section. The water head should check the height of the inspection of the well. The test water head stipulates that the timing of the pipeline when the water head is stipulated, and the water seepage of the pipeline is observed. Until the observation is over, hydration should be continuously replenished in the test pipe section to maintain the test water head constant. The observation time of the water seepage must not be less than 30min.

The measured water seepage should be calculated according to the following formula: q = w/(T*L) …………………………………………………………… (3)

Q in the formula — actual measurement of water seepage (l/min · km);

W —— Moisturizing (L);

T —The measured water seepage observation time (min);

L -The length of the test tube section (m).

The allowable seepage flow of double -wall ripples should be less than equal to the allowable seepage flow of the lower formula calculation:

q = 0.0046di ………………………………………… (4)

In the formula Q —— Allowing the seepage flow M3/24H · km

DI -Pipe inner diameter (MM)

2. Pipe deformation decompression

1) After the groove is backfilled to the high journey, the initial deformation of the vertical diameter of the pipeline should be measured within 12 to 24h, and the initial deformation rate of the vertical diameter of the vertical diameter of the pipe should be calculated. The value shall not exceed 2/3 of the deformation rate allowed by the pipe diameter.

2) The deformation of the pipeline can be tested by a circular heart shaft or closed -circuit TV. The measurement deviation must not be greater than 1mm.

3) When the initial deformation rate of the vertical diameter of the pipeline is greater than 2/3 of the deformation rate allowed by the pipeline diameter, and the pipeline itself is not damaged, it can be corrected according to the following procedures until it meets the requirements:

1) Dig out the groove and fill the soil until the height of the pipeline leaking out of the pipeline. Artificial excavation must be adopted within 0.5m above the pipe top;

2) Check the pipeline, and the damaged pipes should be repaired or replaced;

3) Re -consolidate the backfilling materials at the bottom of the pipeline;

4) Use the appropriate backfilling materials to recover the density according to the required denseness;

5) The initial deformation rate of the diameter of the vertical pipeline.

Layered backfill

Immediately after the water closed experiment passed the bottom, the bottom was cleared to prevent excessive exposure time or soaking in water. When the HDPE double -wall ripple tube is filled in construction, the medium coarse sand should be used. The recovery range must not be less than the design support angle 2α+30 ° (180 °). The thickness of each layer should not be greater than 0.2m. The groove recovery of the grooves within the range of 50cm above and above the pipe can be filled with gravel, high (middle) calcium and coal ash with a fragmented gravel, high (middle) calcium and coal ash (in the middle) The good soil dug out of the trough. Within the bottom of the pipe to the top 0.5m, along the two sides of the pipeline and inspection well, artificial symmetry and layered recovery must be used. It is strictly forbidden to fill in the use of mechanical soil. Temporary limit measures on both sides of the pipeline are used to prevent the pipeline from floating. The density of the dense layer is sampled at the actual layer, and the upper layer backfill is performed after passing the inspection. There should be no accumulated water in the groove when returning. Do not return the silt, organic matter and frozen soil, and the backfill must not contain stone, bricks, and other mixed objects with edges and corners. When the groove is protected by steel plate piles, the pile can be pulled up after the backfill reaches the prescribed height. The piles should be carried out in the interval, and the sidelines can also be used if necessary.

The allowable deviation of the groove excavation

Serial number

Check item

Allowed deviation

check the quantity

Inspection Method






± 20

Between the two wells


Measurement with a standard



+20, -200


Each width of each side of the slot bottom

Not less than regulations


The middle line is measured with a steel ruler, and each side is calculated at 3 points on each side

Groove slope

Not steeply regulated

Measure with slope ruler, 3 points on each side

Payment of allowable deviation

Horizontal axis

No pressure pipeline



Peri -tube

1 o’clock

Steel ruler measurement of the latitude meter measurement or hanging midline

Pressure pipeline




± 10

Standard measuring measurement

± 30

Di> 1000

± 15

Check item

Allowed deviation

check the quantity

Inspection Method




Between the two wells

Between the two wells




No pressure pipeline

No pressure pipeline

Pressure pipeline

Pressure pipeline

± 30