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1、浅谈薄壁不锈钢管卡压式连接的施工技术（The construction technology of thin-walled stainless steel pressure connection）Abstract: thin-walled stainless steel pipe is a new type of building material developed in recent years in our country. It is widely used, and the construction process with the clamp type connection is
2、also widely used. According to the requirements of the compression of thin-walled stainless steel tube connection and beautiful appearance, good sealing performance, put into use after the thin-wall stainless steel pipe connected with the press card is safe and reliable, there is no rework phenomeno
3、n, no maintenance costs, can bring good economic and social benefits.Key words thin-walled stainless steel pressure connection and installation quality controlThin wall stainless steel pipe is developed in China in recent years new high-grade building materials, it can be used for water supply, hot
4、water, drinking water and other projects, has the advantages of light weight, good mechanical properties, long service life, small friction coefficient, less pollution two, broad application prospects. With the installation of the continuous improvement of the construction technology of thin wall st
5、ainless steel pipe, construction technology with a pressure type connection which is widely used, it is with a special seal socket pipe connecting pipe, with special tool press and nozzle connection means a sealing and fastening function, has the advantages of convenient installation, reliable conne
6、ction and economic and reasonable construction, it makes the quality of the project and the labor productivity can be improved effectively. In this paper, thin-walled stainless steel pressure connection in building water supply project construction technology.1. thin-walled stainless steel pressure
7、connection and installation technologyThe end of the U groove thin-walled stainless steel pressure connecting pipe is installed in the O ring, the installation will be inserted into the stainless steel pipe fittings, pressure pipe ends with special clamp pressure card, the stainless steel pipes and
8、fittings at the end of the contraction (bigger on the inside, formed on the surface of hexagonal), whichTo connect strength and meet sealing requirements.The 1.1 main installation processInstallation, preparation, prefabrication, installation of dry pipe, test pressure, erection of vertical pipe, te
9、st pressure, installation of branch pipe and pressure test.Preparatory work before installing 1.1.1Combined with the construction site, familiar with the construction drawings, floor structure in the construction process, with civil for reservation slot, through the walls and floor, leaving a hole o
10、r slot size should be in accordance with the following provisions: the hole size appropriate than 50 100 mm diameter, wall depth of buried pipes for tube diameter 20mm the width of the pipe diameter and 40 50mm, the top upper clearance should not be less than 100mm pipe overhead pipeline.1.1.2 prefa
11、bricationAccording to the design drawings provided the coordinates and elevation line, combined with the actual situation of the scene, drawing sketches of pipe processing, according to the diagram of prefabrication and preassembled, while pipe prefabrication can be carried out in batch production s
12、upport.1.1.3 dry pipe installation(1) the prefabricated pipe sections are shipped to the installation site by numbering.(2) the pipe compression connection, the operation steps are as follows: 1. Material: small pipes with manual pipe cutter cutting tube, large size pipe selection of grinding wheel
13、cutting machine cutting tube, should make the end surfaces perpendicular to the axis and burr; the connecting pipe and tube: draw to the insert length in stainless steel. Should meet the requirements of table 1. Then insert the stainless steel tube vertically into the clamping pipe and confirm the d
14、istance between the mark line and the end of the tube. The nominal diameter is 3, 1525 mm. Nominal diameter 3240 when 5mm. After the confirmation, the end of the pipe is jammed with a special hydraulic clamp, and the clamping connection of the pipeline is completed by pressurizing the hydraulic tool
15、. The pressure values were DN25 to, MPa to 20, and DN15 to 4 for 5MPa.(3): the pipeline is fixed on the pipe fixed on the wall or beam with clamp, steel, no loose phenomenon, the nominal pipe diameter is less than or equal to the installation of 25mm can be used when the plastic pipe clamp.(4) it is
16、 strictly prohibited to produce axial bending and distortion during pipe laying and shall not be forced to correct when crossing the wall or floor. When laying in parallel with other pipelines, the protective distance shall be reserved according to the design requirements. When the design is not spe
17、cified, the net distance shall not be less than 100mm. When the pipe is parallel, the thin-wall stainless steel tube in the trench shall be located on the inside of the galvanized steel pipe.(5) dry pipe installation must be carried out after the hydraulic pressure test, the test pressure is 1.5 tim
18、es the working pressure and not less than 0.6MPa, the pressure piping system should adopt the manual pump slowly, rising time in more than 10min, when the pressure reaches 10min was observed after the required test pressure, such as pressure is reduced to less than 0.02Mpa, then the pressure is redu
19、ced to working pressure as for appearance inspection, pipeline, with no leakage for qualified, can follow the civil construction.1.1.4 riser installationThe prefabricated riser pipe is transported to the installation site and the pipe sections are clamped and pressed together. With the riser, the ou
20、ter wall from the decorative wall distance is: the nominal diameter is less than or equal to 25mm for 40mm, 50mm for the nominal diameter of 32 40mm. Pipe well concealed riser installed strictly according to the size of construction drawings, riser across the floor should be added with plastic casin
21、g, the metal through the roof waterproof casing, casing above the ground and roof 50mm, pipeline installation must be carried out after the completion of the wall plaster, in order to avoid the pollution of pipe. After the riser is installed, hydrostatic test, test pressure and test method are carri
22、ed out with the test of the dry pipe.1.1.5 branch installationThe branch will be transported to the construction site of the prefabricated branch with the general assembly, along the wall laying, with 2 3 per thousand per thousand slope, slope to vertical pipe or water distribution point between the
23、 branch pipe and the wall can be made of plastic pipe fixed. The hydrant or water distribution point should adopt metal pipe clamp or fixed hanger. Clamp or hanger should be set in a distance of 40 80mm accessories.Concealed in the wall in the branch pipe laying, laying of thin-walled stainless stee
24、l pipe, pipe fittings should not be in direct contact with cement slurry, mortar and concrete, so it should be in the tube with protective sleeve or wrap tape. After the installation of the branch pipe, hydrostatic test is carried out, and the test pressure and test method are same as that of the dr
25、y pipe.2. thin-walled stainless steel pressure connection quality control points2.1 thin-walled stainless steel pressure connection2.1.1 pipe material cutting tube, the burr inside and outside of the pipe must be used for file or special deburring device is removed, if not completely clear when the
26、cut is inserted into the rubber sealing ring caused by Water Leakage.2.1.2 the pipe shall be inserted into the pipe before confirming that the pipe type O sealing ring has been installed in the U groove at the end of the pipe. The lubricant shall not be used during the installation.2.1.3 pipe should
27、 be vertically inserted into the pipe, if it is easy to make the skew O ring or cut off and cause Water Leakage, insertion length must meet the specification in Table 1, otherwise they will be inserted into the pipe in place caused by untight connection leakage.When the 2.1.4 is pressed, the groove
28、of the tool jaw must be close to the protruding part of the pipe, and the tool jaw should be perpendicular to the axis of the pipe. The clamping pressure must meet the requirements. After starting the job, the groove shall be secured to the end until a slight vibration occurs. After the clamping, th
29、e thin stainless steel pipe and the pipe fittings are clamped into hexagons, and the quantity gauge is used to check whether the stainless steel tube is intact.2.2 connection of thin wall stainless steel tube and wire fastenerThin wall stainless steel pipe and valve, water meter, water nozzle and ot
30、her wire fastening must use special stainless steel inner and outer silk switch joint, strictly forbid to put silk on water pipe.2.3 anticorrosion of concealed pipesThin wall stainless steel pipe is not allowed to contact cement, cement paste, mortar and concrete directly, so it is better to use pla
31、stic thin wall stainless steel pipe, or add protective sleeve or external anticorrosion adhesive tape.Thermal compensation of 2.4 hot water thin-wall stainless steel tubeThin wall stainless steel pipe installation of hot water, should take the compensation pipeline according to the design requiremen
32、t, the nominal pipe diameter is less than or equal to 25mm the compensation or compensation can be compensated by the square, the installation of stainless steel expansion joints and large diameter pipe.Disinfection and washing of 2.5 straight drinking water thin-wall stainless steel pipesDrinking w
33、ater in the thin-walled stainless steel pipe pressure test should be used after 0.03% Potassium Permanganate disinfection liquid filled pipeline should be disinfected disinfection liquid into the pipeline static 24h. Drain and rinse with potable water. The instrument within the system should be prot
34、ected before flushing,And will hinder the flushing throttle valve, check valve and other pipe attachments removed and properly kept, to be washed after reset. The quality of drinking water should be up to the current standard Hygienic standard for drinking water.2.6 the installation of pipe supportA
35、ccording to the different diameter and the required pipe clamp or hanger, buried should be formed, pipe and pipe should be closely contact, but may not damage the surface of the pipe.2.6.1 the spacing of the fixed stainless steel pipe bracket shall not be greater than 15m, and the distance between t
36、he fixed pipe and the hot water pipe shall be determined according to the thermal expansion capacity of the pipe, the allowable amount of the expansion joint and the amount of the filling. The fixed support shall be installed on the side of the shaft, the interface and the two sides of the floor and
37、 so on.2.6.2 metal stent or pipe with thin wall stainless steel pipe must be made of plastic or rubber isolation, so that the stainless steel pipe from corrosion.The head of 2.6.3 steel bracket for cutting machine cutting, drilling with drill, prohibit the use of gas cutting hole.2.6.4 card specific
38、ations must be matched with the pipe specifications, it is strictly prohibited to generation, clamp nuts must be equipped with flat washer.2.7 piping installation and piping and valve position shall be within allowable deviation range.3. thin-walled stainless steel pipe construction, product protect
39、ionBecause the thin wall stainless steel pipe is thin and should pay attention to product protection construction, pipeline laying should generally be civil wall paint layer or brick veneer after completion of installation, the pipeline is to prevent collision, injured, and wrapped in plastic pipe,
40、to prevent the pipeline was installed for mortar and concrete, paint and other pollution.4, EpilogueThin-walled stainless steel pressure connection and installation of construction equipment and no large-scale equipment, the construction operation is convenient and rapid, high working efficiency, an
41、d the construction process need not use electric welding, does not produce waste gas pollution and noise pollution of the atmosphere itself is a kind of environmental protection of the construction process, construction just after the short material and waste can be recovered. According to the requi
42、rements of the compression of thin-walled stainless steel tube connection and beautiful appearance, good sealing performance, the pipeline in the actual project after installation can be a qualified pressure test, no Water Leakage risks, put into use after the thin-wall stainless steel pipe connected with the press card is safe and reliable, there is no rework phenomenon, no maintenance costs, can bring good economic and social benefits.