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Construction Engineering Safety Technical Disclosure Template

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Semi-rigid flame-retardant plastic pipe concealed laying project< /p>

This chapter applies to lighting projects in general civil buildings and shall not be installed in high-temperature places or ceilings.

1. Material requirements

1.1 The oxygen index of flame-retardant plastic pipes and their accessories should comply with the relevant requirements of fire protection regulations, and have product certificates.

1.2 The wall of the flame-retardant plastic pipe should be uniform in thickness and without bubbles or deformation of the pipe body.

1.3 Plastic boxes and boxes such as switch boxes, socket boxes, and junction boxes should have a neat appearance, complete openings, and no cracks.

1.4 Galvanized materials: flat iron, wood screws, machine screws, etc.

1.5 Auxiliary materials: lead wire, anticorrosive paint, adhesive, cement, sand, etc.

2. Main equipment

2.1 Pencil, tape measure, level, line weight, bucket, ash bucket, ash shovel.

2.2 Hand hammers, chisels, hacksaws, saw blades, knife saws, wood files, etc.

2.3 Bench drills, electric hand drills, drill bits, wood drills, tool bags, tool boxes, high stools, etc.

3. Operating conditions

3.1 When cooperating with the construction of civil structures, install boxes, boxes and pipelines according to the horizontal lines of brick walls and aerated walls.

3.2 When cooperating with the construction of civil structures, large formwork and sliding formwork are used to construct concrete walls. During the reinforcing bar binding process, boxes and pipelines are pre-embedded, and hidden inspections are performed at the same time.

3.3 For aerated concrete floor slabs and round hole slabs, the pipe joints of the hoisted floor slabs should be adjusted in conjunction with the civil engineering work.

4. Operation process

Process flow:

Spring line positioning → box, box, fixing → pipeline laying → sweeping pipe threading line

4.1 Positioning of elastic lines

(1) Positioning of box and box elastic lines on walls

Brick walls, large formwork concrete walls, sliding formwork concrete wall boxes and box elastic lines For positioning, press the pop-up horizontal line, use a small line and a level ruler to measure the exact position of the box according to the design drawing, and mark the size.

(2) For aerated concrete slabs, circular hole slabs, and cast-in-place concrete slabs, the lamp positions should be accurately located according to the design drawings and regulations. After taking the measurements, mark the location of the box dimensions.

4.2 Fixing of boxes and boxes

(1) The fixing of boxes and boxes should be straight and firm, with full mortar and accurate vertical and horizontal coordinates.

(2) Stable injection of boxes and boxes into brick walls

A. Reserve the holes for boxes and boxes: First process the length of the pipe according to the design drawing, cooperate with the bricklayer construction, and position it at a distance from the box and box At about 300mm, reserve the length to enter the box or box, throw the pipe out of the reserved hole, and plug the ends. When the box or box is stabilized, insert the tubes into the box or box one by one.

B. Pick holes to securely fill the box and box, and then connect the short pipe: press the pop-up horizontal line, find out the exact location of the box and box according to the design drawing, and then pick holes. The holes should be slightly smaller than the box and box. Bigger. After the hole is dug, first wet the four walls of the hole with water and clean up the debris in the hole. Knock out the knock-out holes of the box according to the direction of the pipeline, and then use high-grade cement mortar to stabilize the box and box into the hole as required. After the cement mortar solidifies, connect the short pipe into the box and box.

(3) Large formwork concrete wall to stabilize boxes and boxes:

A Drill holes in the formwork and use screws to fix the boxes and boxes on the formwork.

B is directly fixed on the steel bar with a reinforcing steel box. Remove the screws fixing the boxes and boxes in time before removing the mold.

(4) Sliding formwork concrete wall to stabilize boxes and boxes:

A Reserve holes, set boxes and boxes, then remove the sets, and then stabilize boxes and boxes; < /p>

B Use screws to fix the box and box on the flat iron, and then weld the flat iron to the steel bar, or directly fix it to the steel bar with a reinforcing steel box, and weld the supporting steel bars according to the thickness of the wall.

(5) Aerated concrete plate and round hole plate to stabilize the lamp box. Mark the position of the lamp position, first punch the hole, and then pick the hole from bottom to top, making the hole smaller at the bottom and larger at the top. Put the box with the corresponding fixing body into the hole, and fix the hanging board. After piping is installed, use high-grade cement mortar to stabilize it.

4.3 Pipe laying

(1) Piping requirements

A The connection of semi-rigid plastic pipes can be carried out using the casing bonding method and special ends. connect. The length of the casing should not be less than three times the diameter of the pipe, and the joints should be firmly bonded with adhesive;

B When laying pipelines, bends should be minimized. When the length of the straight section of the line exceeds 15m, or when there are three right-angle bends and the length exceeds 8m, a junction box should be installed in the middle.

C The grooved pipes should be fixed and protected with high-grade cement mortar, and the protective layer should not be less than 15mm.

D When grooving and laying pipes in aerated concrete slabs, only grooving along the seams of the slab is allowed. Horizontal grooving and breaking of steel bars are not allowed. At the same time, the width and depth of the ticking groove should be 5mm larger than the outer diameter of the pipe.

E The vertical risers in the sliding formwork are not allowed to have joints.

F The minimum bending radius of the pipe and the flatness of the pipe bend are shown in Table 3-3-1.

(2) Pipe laying on brick wall

A pipe connection. Casing bonding or end connection can be used. Drive nails into both sides of the pipe and tie the pipe securely with lead wire, then smooth the trench with cement mortar.

Pipe B enters the box and is connected to the box. Can be bonded or terminated. The tubes entering the box or box are not allowed to go in or out. They should be flush with the opening of the box or box. There is one hole for each tube. Long holes are not allowed.

(3) When piping in large formwork concrete walls and sliding formwork concrete walls, the pipe openings should be sealed first, and the pipes should be inserted into the box without interruption. After the pipes are put into the box, the pipelines should be laid along the steel bars. And there are lead wires to tie the pipes to the steel bars.

4.4 When cleaning the pipe and threading the tape, cut the pipe mouth flat with the box and box opening.

5. Quality standards

5.1 Guarantee items

The material and applicable location of semi-rigid flame-retardant plastic pipes must comply with the design requirements and construction specifications. .

Inspection method: observation and inspection or inspection of concealed engineering records.

5.2 Basic items

(1) The pipeline connections are tight, the pipe mouth is smooth, and the protective layer is greater than 15mm. Inspection methods: Observation and inspection, checking concealed engineering records.

(2) The boxes and boxes are set up correctly and fixed reliably. The pipes enter the boxes and boxes straightly, and the exposed length inside the boxes and boxes should be less than 5mm.

Inspection method: observation, ruler inspection.

(3) There is a compensation device passing through the deformation joint, and the compensation device can move freely.

Inspection methods: observation inspection and inspection of concealed engineering records.

5.3 Allowable deviation items

The allowable deviations for pipeline laying and box and box installation are shown in Table 3-3-1.

6. Finished product protection

6.1 When grooving and making holes, do not use excessive force to avoid breaking the surrounding wall surface. It is not easy to make the opening too large or too wide, so as not to cause civil structural defects.

6.2 Pipelines should be protected immediately after being laid. When other types of work are operating, care should be taken not to flatten or step on the pipes.

6.3 When making holes in concrete slabs or air-entrained slabs, be careful not to break the steel bars. When making holes, drill holes first and then expand them. It is not allowed to use a sledgehammer to make holes from above.

6.4 When pouring concrete in conjunction with civil construction, personnel should be assigned to guard the pipes to prevent pipeline displacement or mechanical damage.

7. Quality issues that should be paid attention to

7.1 If the pipeline is exposed or the protective layer is less than 15mm, the depth should be ensured when grooving, and the pipe should be fixed in time before cementing it. Mortar protection.

7.2 The stabilized and pre-embedded boxes and boxes are skewed, the coordinates are inaccurate, and the mortar is not full, etc. When stabilizing the boxes and boxes, be sure to find the correct position. First, inject an appropriate amount of cement mortar, then use a wire drop to align, and then use cement mortar to fill the gaps around the boxes and boxes.

7.3 The concave flatness at the bend of the pipe is too large and the bending radius should be greater than or equal to 6D. The simmering bend should be operated as required and fixed and protected in time.

7.4 The pipeline is blocked. It is easy for debris to fall into the upward-facing pipe opening, so the pipe opening should be blocked in time. When working in other types of work, be careful not to damage the laid pipelines to avoid blocking the pipelines.

Technical person in charge: Reporter: Receiver: