Outdoor fire pipeline construction program process
The inspection does not comply with the provisions of the timely report to the relevant departments as soon as possible to solve or send the corresponding team deadline for rectification. For those who cause accidents due to dereliction of duty, penalties should be made. So, here is what I have organized for you outdoor fire pipeline construction program process, welcome to read and browse.
1, trench excavation and backfill:
1.3.1 The trench of the pipeline should be backfilled in a timely manner after passing the hydraulic test.
1.3.2 backfill, the bottom of the slot to the top of the pipe within 50cm above, shall not contain organic matter, frozen soil, and more than 50mm of bricks, stones and other hard blocks; backfill backfill shall be tamped and compacted, and the difference in elevation between the two sides should be little difference.
1.3.3 The thickness of each layer of backfill is 250mm.
1.3.4 When the trench is backfilled, bricks, stones, wood and other debris should be removed.
1.3.5 Backfill or other backfill materials shall be transported into the trench without damaging the pipe joints and their interfaces, and shall comply with the following
(1) According to the amount of one layer of false thickness of backfill material to the trench, and shall not be stacked in the area of compaction
.
(2) The backfill material on both sides of the pipe and within 50cm above the top of the pipe should be transported symmetrically into the slot on both sides of the trench, and should not be thrown directly on the pipe; backfill of other parts should be transported uniformly into the slot, and should not be
pushed into the centralized.
1.3.6 Trench backfill compaction, shall comply with the following provisions:
(1) backfill compaction should be carried out layer by layer, and shall not damage the pipe.
(2) Both sides of the pipe and 50cm above the top of the pipe shall be compacted by light tamping, and the difference in the height of the compacted surface on both sides of the pipe
shall not be more than 30cm.
(3) When backfilling and compacting in sections, the stubble of the neighboring sections shall be in the form of a trapezium, and there shall be no leakage of the tamping.
(4) Pipeline trench is located in the roadbed range, the top of the pipe within 25cm above the top of the backfill compaction
degree should not be less than 87%.
2, pipe installation and laying.
2.3 Galvanized steel pipe trench connection construction method
2.3.1 Pipe cutting
Steel pipe cutting machine will be used to cut the pipe according to the required length, the incision should be smooth, the end of the incision and the axis of the pipe should be vertical. If there is burr at the cut, sandpaper, file or sander should be used to polish it. It is recommended to use the pipe cutter of the nesting machine for pipe breaking, the advantage of which is that the end face of the pipe is vertically flat and has few burrs. Conventional toothless saw for pipe breaking, due to its saw blade factory end surface is not flat, too much force, pipe rotation and other factors are prone to cause pipe section misalignment, burrs.
2.3.2 Trench processing
① Select pipe in line with the design requirements, pipe ports without burrs, smooth, uniform wall thickness, galvanized layer is not flaking, no obvious defects in the pipe.
② should ensure that a group of three people. One person to control the switch of the rolling machine and jack lift, one person to observe the adjustment of rolling machine at the pipe rotation, one person to observe the adjustment of the position of the pipe in the rolling machine tailstock.
③ The steel pipe to be processed in the groove is set up on the grooving machine and the tailstock of the grooving machine.
④ Measure the level of the steel pipe with a level meter to ensure that the steel pipe is in a horizontal position.
⑤ Tighten the end face of the steel pipe with the positioning surface of the tire mold of the grooving machine, so that the axis of the steel groove is perpendicular to the positioning surface of the tire mold of the grooving machine.
⑥ Start the groove roller motor. Slowly press down the jack, so that the groove rolling machine compression mold evenly rolling steel pipe. Use vernier calipers to check the depth and width of the groove, so that it is in line with the manufacturer's groove size, and then stop.
⑦ Unload the jack and remove the steel pipe.
2.3.3 Steel pipe opening and installation of mechanical tee and cross
Installation of mechanical tee, mechanical cross of steel pipe should be in the joints of the branch part of the hole with a hole opener.
Specific methods of operation are as follows:
(1) Use the chain to fix the hole opener in the steel pipe at the intended location of the hole (the location of the hole shall not be located in the pipe welding).
(2) Select the appropriate drilling bit installed in the hole opener chuck.
(3) Start the motor to rotate the drill.
(4) Operate the handwheel set on the top of the column, turn the handwheel slowly downward, add appropriate amount of lubricant (to protect the drill bit) at the contact point between the drill bit and the steel pipe
to complete the drilling of holes in the steel pipe by the drill bit.
(5) When opening the hole, the force should be applied evenly and cooled with water, gloves are strictly prohibited for operation, and after opening the hole, the surrounding d (hole
diameter)+16mm range is cleaned up (including burrs, iron filings, rust, oil, etc.). Hole with burrs, need to use sandpaper, file or sander to polish smooth.
(6) Check whether the mechanical tee washer is broken (if broken must be replaced in a timely manner), tee threads
whether there is a broken wire, lack of wire and other requirements. Mechanical tee and supporting clamps placed on the top and bottom of the hole in the steel pipe, pay attention to the mechanical tee, rubber sealing ring and the hole center position is correct. Insert the bolts into the holes and hand tighten the bolts on both sides to make sure that the clamps. Arc completely embedded in the groove of the shell, evenly tighten the bolt until the shell surface and gasket set contact tight.
2.3.4 Pipe installation
Installation must follow the principle of installing large caliber, main pipe and riser first, and small caliber and branch pipe later. Installation process can not be skipped, must be installed continuously in order to avoid difficulties in connecting between segments and affect the overall performance of the pipeline.
(1) Prepare to meet the requirements of the trench pipe sections, fittings and accessories, and remove debris from the pipe.
(2) Check that the rubber seal is intact; place it on the end of a steel pipe.
(3) Another steel pipe near the end of the rubber seal has been stuck on the end of the steel pipe, there should be a certain
gap between the two ends. In our construction, the gap is generally maintained at about 2mm.
(4) the rubber sealing ring on the top of another steel pipe, so that the rubber sealing ring is located in the middle of the interface,
and in its periphery coated with lubricant (no special requirements can be used in detergent or soapy water).
(5) The axis of the two pipes should be correct.
(6) Install the upper and lower clamps on the outside of the rubber seal at the interface position, and snap the convex edge of the clamp into the groove.
(7) Press the lugs of the upper and lower clamps by hand, and tighten the flange of the clamps with a mallet to tighten the upper and lower clamps
against each other.
(8) Put on the bolt at the clamp bolt position and tighten the nut evenly to prevent the rubber seal from wrinkling.
(9) Check to make sure the full circumference of the clamp flange is seated in the groove.
2.4 Installation of pipe supports and hangers:
2.4.1 According to the checked pipeline single-line diagram, measure the elevation of the pipeline, the direction, the position of the bracket, choose the correct
support, hanging, bracket form, according to the national standard drawing set production.
2.4.2 Support, hanging, bracket should be welded on the embedded parts or fixed with expansion bolts.
2.4.3 According to the design requirements of the pipeline coordinates, elevation, slope to determine the location of the pipe rack to install pipe rack.
2.4.4 Pipe support, hanging, bracket installation, should comply with the following provisions:
① location is correct, buried flat and firm;
② close contact with the pipeline, fixed firmly;
③ fixed in the building structure of the pipeline support, hanging, shall not affect the safety of the structure.
2.4.5 Horizontal installation of steel pipe support spacing should be consistent with the design requirements and specifications.
3, outdoor fire hydrant installation:
3.1 fire hydrant pipe installation branch pipe installation and dry pipe installation of two ways, according to the actual situation of the site selection.
3.2 Installation form of ? Shallow installation? The fire hydrant, the branch pipe from the trunk should be as short as possible.
3.3 Hydrant short pipe and water pipeline connection can be used in the form of flange, socket interface, under normal circumstances, the pressure
1.6MPa flange connection, the pressure of 1.0MPa socket connection.
3.4 Fire hydrant with automatic water discharge device, when the built-in water valve is closed, automatically empty the hydrant retained within the
stagnant water in order to prevent the hydrant from freezing and cracking.
3.5 Fire hydrant bend base or fire hydrant tee under the pier, the pier must support the tight bend or tee bottom.
3.6 Above-ground fire hydrant discharge nozzle below the soil, should be paved with a layer of pebbles seepage layer.
3.7 The installation of fire hydrant box fittings should be carried out before delivery. Fire hose should be folded on the hanger or rolled solid, coiled tightly in the box, the fire hose should be placed vertically on the inside of the box, the fire hose and water gun, quick connector connection, generally with 143V lead wire tied two ways, each way not less than two turns, the use of clamps, in the inside of an additional lead wire. When there is an electric control button, attention should be paid to the construction with the electrical specialty.
4, fire pump connector installation
4.1 Fire pump connector installation, should be vertical to the ground, no obvious tilt.
4.2 The center height of the interface of the aboveground type water pump connector is 700mm from the ground, and the center height of the interface of the wall type water pump connector is 1100mm from the ground.
4.3 The top of the interface of the underground type water pump connector is 250-400mm from the bottom of the manhole cover.
4.4 Between the body of the water pump connector and the elbow with the seat, a short pipe of double flanges with suitable length should be connected. The short flange pipe is made of steel pipe, the inner wall should be coated with antirust paint, and the outer wall should be made of asphalt anti-corrosion.
4.5 Install control valve, check valve, safety valve, etc. on the inlet side of the pump coupler with seat, if using
3-in-1 pump coupler, there is no need to install the combination.
4.6 The fire pump connector should be installed according to the selected type (e.g. above ground, underground, etc.), and its installation location
should be clearly marked.
5, valve installation
5.1 Valve specifications, models, materials and brands should be selected according to the design drawings and specifications.
5.2 Valve installation, should be done before the pressure strength test. The test should be 10% sampling in the number of each batch (the same brand, the same specifications, the same type). If there is a leakage of unqualified, should be sampled again 20%, such as still unqualified shall be tested individually. Strength and tightness test pressure should be the pressure of the valve factory regulations. And do a good job of valve test records.
5.3 Valve installation, should carefully check the valve type and specifications are in line with the design requirements. Valve body labeled arrow, should be consistent with the direction of media flow.
5.4 The location of the valve installation should meet the design requirements, and easy to operate.
6, pipeline hydraulic test:
Because the pipeline is long, the trench can not be installed in a short period of time after all the trench excavation, trench excavation should be backfilled in a timely manner, trench excavation will affect the construction of the relevant units, so our unit according to the site conditions for
segmented construction section pressurization.
6.1, the general provisions
Pipeline hydraulic test should be done before the introduction of water and drainage diversion route design. Pipeline flooding should be from the downstream slowly into the irrigation, irrigation, in the test pipe section of the upstream top of the pipe and the pipe section in the raised point should be set up exhaust valve, the pipeline gas exclusion.
6.2 Pressure pipeline all backfill should be carried out before the strength and tightness test, pipeline strength and tightness test should be used to test hydraulic test method.
6.3 The back of the test pipe section should be in accordance with the following provisions:
The back should be located in the original soil or artificial back; when the soil is soft, reinforcement measures should be taken; back wall should be flat, and should be perpendicular to the axis of the pipe.
6.4 Hydraulic test, the use of equipment, instrumentation specifications and their installation should be in accordance with the following provisions:
When the use of spring manometer accuracy of not less than 1.5 level, the maximum range of the test pressure for the test pressure of 1.3 ~ 1.5 times the nominal diameter of the case should not be less than 100mm, should be calibrated prior to use; test pumps, gauges should be installed at the end of the test and the axis of the pipeline. Perpendicular to the branch pipe.
6.5 Pipeline hydrostatic test should meet the following requirements:
Pipeline installation inspection, backfill should be in accordance with the provisions of the soil; test pipe section of all openings should be plugged tightly, there shall be no water seepage phenomenon; the test pipe section shall not be used to do the blocking of the gate valve, there shall be no fire hydrant, water hammer eliminator, safety valves and other accessories.
6.6 pipeline hydraulic test, should comply with the following provisions:
pipeline pressure, the pipeline gas should be excluded, pressure during the process, when the spring manometer gauge needle swing, unstable, and slow pressure, should be re-exhausted and then pressurized; should be graded pressure, each pressure should be inspected back, support piers, pipe body and interfaces, when there is no abnormality, and then continue to pressurize. Hydrostatic test process, the back of the top support, pipe ends are strictly prohibited to stand people; hydrostatic test, it is strictly prohibited on the pipe body, interface knocking or repair defects, defects, should be marked, unpressurized repair; hydrostatic pressure rises to the test pressure, maintain a constant pressure of 10min, check the interface, no damage to the pipe body and leakage phenomenon, the pipeline strength test is qualified.
7, pipeline system flushing:
7.1 Pipeline flushing should be in the pipeline after the pressure test, debugging, before operation.
7.2 Pipeline flushing inlet and outlet should be selected appropriate location, and can ensure that the piping system is flushed clean of debris. Drainage pipe cross-sectional area should not be less than 60% of the cross-sectional area of the pipeline being flushed, the drain should be connected to the drainage well or drainage ditch.
7.3 Flushing to the maximum pressure and flow rate possible in the system, until the exit of the water color and transparency
Brightness and the entrance of the visual consistency is qualified.
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