What are the precautions for the production and installation of ventilation duct supports?

Precautions should be taken when making and installing the air duct bracket:

1) When the bracket is made, it should be in accordance with the steel specifications specified in the national standard atlas and shall not be changed at will.

2) All bolt holes on the air duct support shall be drilled, and gas welding shall not be used to cut holes.

3) Bracket with oblique support, the weld should be full welded.

4) The blanking of the boom in the hanger should be accurate, and the lap weld should not appear in the middle of the boom.

5) When the air duct section is small, the air duct boom can be fixed on the floor slab by expansion bolts, and when the air duct is large, the way of drilling should be adopted.

6) Before the installation of the bracket, the center line of the air duct should be popped up on the wall rest, column and floor surface, and then the horizontal position and elevation of the bracket should be determined, so as to ensure the levelness and plane center position of the air duct after installation.

7) Before the bracket is installed, the exposed part should be derusted and brushed with anti-rust paint.

8) In order to prevent the occurrence of cold bridges, wooden squares or wooden blocks should be padded on the contact surface of the air duct and the support.

9) The bracket installed on the wall, after installation and leveling, should be plugged with C20 concrete and tamped to be level with the structural surface.

10) When the pre-treated steel components on the wall and column are adopted, the concrete is poured in the civil engineering.

, the position and elevation of the steel members should be reviewed.

11) When there are no special requirements, the spacing of the air duct bracket is generally 3m, but a bracket should be installed at each end of the air duct less than 3m, and a bracket should be installed at the tee or elbow.

Pipe support is also known as a support, a pipe part, which is needed wherever there is a pipe laying. Due to the different operational performance and layout requirements of the pipeline, it is divided into two kinds of pipe frames: fixed and movable. So, what are the installation specifications for pipe supports?

What is the best way to install the pipe support? Next, let's take a detailed look at the installation specifications and installation methods of pipe supports!

1. What are the installation specifications for pipeline supports?

Article 1 of the installation of pipe supports, hangings and brackets stipulates that the following specifications shall be installed:

1. The position must be correct, and the burial should be smooth and firm;

2. The fixing bracket and the pipeline should be tightly connected and fixed firmly;

3. The sliding bracket should be flexible, a gap of 3-5 mm should be left on both sides of the sliding bracket and the chute, and the amount of longitudinal movement should meet the design requirements;

4. The hanger and boom of the non-thermal elongation pipeline should be installed vertically;

5. The hanger and boom with thermal elongation pipeline should be offset in the opposite direction of thermal expansion;

6. The support and hanger fixed on the building structure shall not affect the safety of the structure.

Second, what is the best method for the installation of pipeline supports?

1. Installation method.

There are three types of pipe supports, namely fixed supports, movable supports and spring support hangers, but fixed supports are basically used when installing cold system pipes. There are also three methods in installation, including direct embedding into the wall method, embedded parts welding method, nailing, expansion bolt fixing method. If the latter two methods are used for cold system pipes, the embedded parts welding method is used for heavier pipes.

2. Precautions for installation.

According to the regulations, the material, size and formation of the specified support and hanger must be implemented according to the design documents, and the pipeline must be installed firmly. In addition, the installation should be treated with anti-corrosion, and the outside of the support and hanger should be brushed with anti-rust paint, which can reduce the cold loss. In addition, the installation needs to consider the spacing between the crane and the support, and consider the reasonable distribution of the pipe load.

3. Pipeline installation spacing.

The spacing of pipelines is to facilitate future installation and maintenance, but it should not be too large. Therefore, the spacing between the outer wall of the pipe and the outer wall of the insulation layer should not be less than 100 mm, and the distance between the insulation end of the pipe frame beam should not be less than 100 mm, and the medium and low pressure pipelines should be roughly 80-90 mm, and the high-pressure pipelines should be more than 100 mm. If there are side-by-side valve handles, the spacing between the suction pipe and the discharge pipe shall not be less than 250 mm when installed horizontally, and 200 mm when the upper and lower pipes are installed, and the suction pipe shall be under the discharge pipe.

There are no requirements for the installation location.

The installation of the cable tray is based on the building layout plan, combined with the setting of air conditioning pipelines and electrical pipelines, the convenience of maintenance, and the density of cable routing to determine the best route of the cable tray. Indoors, as far as possible along the building walls, columns, beams and floor erection, if you need to use the comprehensive pipe gallery erection, it should be erected in parallel on one side or above the pipeline, and consider the down line and branch line to avoid crossing as much as possible, if there is no other pipe frame borrowing, you need to set up (support) columns.

According to the number of cables, the diameter of the cable and the spacing of the cable, the model and specification of the cable tray, the length of the supporting arm, the length and spacing of the pillar, the width and the number of layers of the cable tray are determined.

There are no specifications for the installation location of air ducts and bridges, but there are requirements for thermal gas pipes and corrosive pipes.

The laying installation needs to maintain a minimum clear distance from the pipe. Install according to the diagram specification below:

The installation position of the bridge should be according to the design drawing. However, most of the design drawings have neither planar coordinate position annotations nor elevation annotations. Therefore, it must be determined according to the actual situation of the project.

In general, the following principles should be mastered:

a.Pipes and equipment should be kept away from high-pressure or high-temperature gases (liquids). Keep away from corrosive gas (liquid) pipes. The clear distance between the bridge and various pipelines and equipment should meet the requirements of Table 3.

b.On the process pipe gallery frame, the bridge should be installed on the side of the process pipeline as much as possible to facilitate the laying of cables and maintenance parts.

c.The net distance between the bridge and the wall and the top should be determined according to the size and number of cables in the bridge, and the operation space should be ensured. The ceiling should not be less than 150mm.

d.The net distance between horizontal adjacent bridges should not be less than 50mm. When several groups of cable trays (multi-layers) are installed in parallel at the same height, the net distance between them should be greater than 600mm.

e.The order of the multi-layer bridge and the distance between the layers should meet the design requirements. If there is no requirement in the design, the distance between the layers is generally not less than that between the control cables, between the power cables, and between the weak current and the power cables.

f.The positioning of the bridge in the ceiling, due to the small clear height, must be coordinated with other professional construction personnel. Avoid conflicts with air ducts, large-diameter fire hoses, sprinkler mains, hot and cold water pipes, drainage pipes and air conditioning and exhaust equipment in the ceiling, and reduce unnecessary rework.

g.Installation height (lower chord) of horizontally laid bridges (except for cable tunnels, technical floors, etc.).

It should not be lower. h.Install the bridge in the place with slope, and the slope of the bridge should be consistent with the building. The bridge frame installed next to the wall of the building with a garden arc should be consistent with the garden arc.

1 General provisions: bai

1 1 This chapter applies to the general industrial and civil construction of new construction and expansion with an electric voltage of 10kV and below.

Construction cables. version, bridge security installation and cable laying in the bridge.

1 2 The installation of the cable tray and the laying of cables in the tray shall be constructed in accordance with the approved design documents.

1 3 The pallet (slot) or ladder frame straight section supported by the support, hanging, and bracket is combined, and the curved non-straight section is combined, and the rigid structural system with continuity of the cable is the cable tray.

The metal cable tray and its bracket and the metal cable duct that is introduced or led out must be reliably grounded (PE) or zeroed (PEN) and must comply with the following requirements:

1. The total length of the metal cable tray and bracket shall be connected to the grounding (PE) or zero (PEN) trunk at no less than 2 places;

2. The copper core grounding wire of the crossover wire at both ends of the connecting plate between the non-galvanized cable tray shall not be less than 4mm2;

3. The two ends of the connecting plate between the galvanized cable tray shall not be connected to the grounding wire, but there shall be no less than 2 connecting fixing bolts with locknuts or washers at both ends of the connecting plate.

1 5 It is strictly forbidden to have defects such as twisting, armor flattening, sheath fracture and serious scratches on the surface of cable laying.

1 6 If there is a place with fire protection requirements at the cable tray, fire isolation measures should be taken.

The location is not required, but the pressure in the air duct is small, so it is usually done first, and the air duct is made when the bridge is done, and that's it.

The bridge and the water and the fire give way to the wind.

According to national specifications, cable tray is not allowed to be installed.

Under the water pipe, there is a distance (it seems to be 150mm) between the parallel installation above and the side of the 100 sides. You can refer to the national specification GB 50217-2007 power cable laying specification. In fact, there are still some places where it is inevitable to go back to the bottom of the water pipe, to see if the management is strict, the design of the answer, try to follow the norms, and now do the design of the lifelong responsibility system, so don't be sloppy.

Attention should be paid to the following issues when installing ventilation ducts:

1. The internal debris is not removed before the installation of the air duct.

Before the installation of the air duct, the internal and external debris should be removed, and the cleaning and finished products should be done, and the nozzle should be blocked in time after construction.

2. After the installation of the air duct system, the light leakage and air leakage inspection and test are not carried out according to the regulations.

Light leakage or air leakage measurement is a test measure for the construction quality of ventilation and air conditioning, must be inspected in strict accordance with the requirements and specifications, if the air duct system is not installed in accordance with the provisions of the light leakage, air leakage inspection and test, may cause a large number of air leakage in the system, so that the whole system and the project can not meet the use requirements, increase unnecessary rework and waste, but also waste energy.

3. The installation position of various dampers is not convenient for operation and maintenance.

All kinds of dampers should be installed in parts that are easy to operate and maintain, and maintenance openings should be set up in the ceiling or hoistway.

4. The spacing between the air duct branch and the hanger is too large.

The spacing of the air duct support and hanger is too large, which will cause the air duct to deform and affect the sensory effect; If the expansion bolt is used improperly, the weight of the air duct exceeds the bearing capacity of the lifting point, and even the air duct will fall, resulting in potential construction safety hazards.

5. When the air duct system is connected by a combined flange, the interface leaks.

If the air leakage of the interface does not meet the quality standards, it will cause excessive air volume loss of the whole system, unable to meet the air volume requirements, and cause serious waste of energy.

6. There are no embedded parts at the connection between the brick structure air duct and the metal air duct, or the sealing gap is too large or the connection is not tight.

7. Distortion occurs during the installation of flexible short pipes and rectangular short pipes.

The twisting of the short pipe is prone to quality problems and also affects the aesthetics, so special attention needs to be paid when installing.

8. The flexible short pipe of the smoke prevention and exhaust system is made of flammable materials.

The material of the flexible short pipe of the smoke prevention and exhaust system must be non-combustible material, and the flexible material that is anti-corrosion, moisture-proof, breathable and not easy to mildew should be selected. Measures should be taken to prevent condensation when used in air-conditioning systems; The air conditioning purification system should also be a material with a smooth inner wall that is not easy to produce dust.

9. The air duct system is not equipped with anti-swing brackets.

When the ventilation duct is installed in the laboratory, when the length of the main and dry air ducts suspended horizontally exceeds 20m, a fixed point to prevent swing should be set, and each system should not be less than 1.

The national standard "Code for Acceptance of Construction Quality of Building Water Supply and Drainage and Heating Engineering" GB50242-2002 has the following requirements for pipe supports:

Article The installation of pipeline supports, hangings and brackets shall comply with the following provisions:

1. The position is correct, and the burial should be smooth and firm;

2. The contact between the fixing bracket and the pipeline should be tight, and the fixing should be firm;

3. The sliding bracket should be flexible, there should be a gap of 3 to 5 mm on both sides of the sliding bracket and the chute, and the amount of longitudinal movement should meet the design requirements;

4. The hanger and boom of the non-thermal elongation pipeline should be installed vertically;

5. The hanger and boom with thermal elongation pipeline should be offset in the opposite direction of thermal expansion;

6. The support and hanger fixed on the building structure shall not affect the safety of the structure Article The spacing of the support and hanger for the horizontal installation of the steel pipe shall not be greater than the provisions of the following table: The maximum clearance nominal diameter of the steel pipe pipe support mm 15 20 25 32 40 50 70 80 100 125 150 200 250 The maximum spacing of the bracket m Insulation pipe 2 3 3 4 4 4 6 7 7 8 Non-insulated pipe 3 4 5 6 6 7 8 11 Article Heating, water supply, The bracket spacing of the plastic pipe and composite pipe installed vertically or horizontally in the hot water ** system shall comply with the provisions of the following table, and the pipe bracket made of metal shall be lined with non-metallic pads or casings between the pipe and the bracket: The maximum gap diameter of the pipe support of the plastic pipe and composite pipe mm 12 14 16 18 20 25 32 40 50 63 75 90 110 The maximum spacing Riser Horizontal pipe Cold water pipe Hot water pipe Article 1 The spacing of the bracket installed vertically or horizontally of copper pipes shall comply with the provisions of the following table:

The maximum nominal diameter of the bracket for the copper pipe pipe bracket mm 15 20 25 32 40 50 65 80 100 125 150 200 The maximum spacing of the bracket m Vertical pipe Hot water pipe.