阅读说明：本技术 一种机械化制弧的弧形管道施工方法 (Construction method of arc-shaped pipeline for mechanical arc making ) 是由 张元广 胡杰 徐振 谢兴龙 崔晓春 于 2019-09-03 设计创作，主要内容包括：本发明公开了一种机械化制弧的弧形管道施工方法,属于建筑施工技术领域,采用制弧机对待施工的弧形管道压弧,制弧机包括两个水平方向上对称设置的定轮和一个竖直方向运动的动轮,动轮圆心位于两定轮圆心连线的中心线上；首先根据待施工场地形状计算出待施工的弧形管道的弧度半径；然后根据所述弧度半径计算出制弧机动轮定轮尺寸表；根据制弧机动轮定轮尺寸表加工待施工场地所需的弧形管道；连接所述弧形管道并加设固定支架；对施工完成的弧形管道进行试验检测。本发明采用机械化制弧,解决传统弧形管道施工工艺的质量缺陷,提高施工的机械化程度和施工质量。(The invention discloses a construction method of an arc-shaped pipeline for mechanical arc making, which belongs to the technical field of building construction, wherein an arc pressing machine is adopted to press an arc on the arc-shaped pipeline to be constructed, the arc pressing machine comprises two fixed wheels which are symmetrically arranged in the horizontal direction and a driving wheel which moves in the vertical direction, and the circle center of the driving wheel is positioned on the central line of the connecting line of the circle centers of the two fixed wheels; firstly, calculating the radian radius of an arc-shaped pipeline to be constructed according to the shape of a site to be constructed; then calculating a fixed wheel size table of the arc-making motor-driven wheel according to the radian radius; processing an arc pipeline required by a to-be-constructed field according to an arc-making motor-driven wheel fixed wheel size table; connecting the arc-shaped pipeline and additionally arranging a fixed bracket; and testing and detecting the constructed arc-shaped pipeline. The invention adopts mechanized arc making, solves the quality defect of the traditional arc pipeline construction process, and improves the degree of mechanization and the construction quality of construction.)

1. A mechanized arc-making arc-shaped pipeline construction method is characterized in that an arc-making machine is adopted to press an arc for an arc-shaped pipeline to be constructed, the arc-making machine comprises two fixed wheels which are symmetrically arranged in the horizontal direction and a driving wheel which moves in the vertical direction, and the circle center of the driving wheel is positioned on the central line of the connecting line of the circle centers of the two fixed wheels;

firstly, calculating the radian radius of an arc-shaped pipeline to be constructed according to the shape of a site to be constructed;

then calculating a fixed wheel size table of the arc-making motor-driven wheel according to the radian radius;

processing an arc pipeline required by a to-be-constructed field according to an arc-making motor-driven wheel fixed wheel size table;

connecting the arc-shaped pipeline and additionally arranging a fixed bracket;

and testing and detecting the constructed arc-shaped pipeline.

2. The method of claim 1, wherein the calculation of the radius of the pipe to be constructed is as follows:

obtaining a center line of the arc-shaped pipeline according to the design shape of the site to be constructed, setting the center line as an arc-shaped line segment AB, and measuring the length L1 of a chord AB;

making a vertical line through the midpoint D of the chord AB, intersecting the arc AB at the point C, knowing that the vertical line passes through the center of a circle according to the sag theorem, and measuring the length L2 of the CD;

and if the circle center of the arc ab is a point O and the radius is R, the Rt delta AOD exists, the radius R1 is calculated according to the pythagorean theorem, and the radius R1 is the radius corresponding to the arc pipeline.

3. The method for constructing an arc pipeline through mechanized arc manufacturing according to claim 2, wherein the calculation process of the dimension of the fixed wheel of the motor-driven wheel of the arc manufacturing is as follows:

setting the circle center of the wheel as a point E, the radius of the fixed wheel as R2, the middle point of a connecting line of the circle centers of the two fixed wheels as a point F, the center distance of the two fixed wheels as L, and the outer diameter of the prefabricated arc-shaped pipeline as D, then:

OE＝R1+R2+D/2，

EF＝1/2L，

in Rt Δ OEF, calculating the OF length by using pythagorean theorem;

the distance from the circle center of the driving wheel to the midpoint of the connecting line of the circle centers of the two fixed wheels is as follows:

OF-R1+R2+D/2。

4. the method as claimed in claim 1, 2 or 3, wherein the construction site comprises arc pipes with various radians, and the radians radii of the arc pipes are calculated respectively to form a corresponding table of the fixed wheel size of the motorized wheel for making the arc.

5. The method as claimed in claim 1, wherein a measuring gauge with a measuring accuracy of mm is fixed at the position of the driving wheel, and a limit block is provided.

6. The method of claim 1, wherein the arc is machined by two passes to achieve the design arc.

7. The method for constructing the arc-shaped pipeline by the mechanical arc making according to the claim 1 or 6, wherein every time 10 steel pipes are processed into a group, the first steel pipe, the middle steel pipe and the last steel pipe are respectively taken out, the chord lengths of the processed arc-shaped pipeline are measured, if the chord lengths are consistent, the radians are consistent, and the arc-shaped pipeline is judged to meet the use requirement.

8. The method as claimed in claim 1 or 4, wherein the corresponding central angle of each radian of the project to be constructed is calculated, and the number of pipes required for machining the radian is calculated according to the total central angle, thereby preventing the waste of pipes caused by excessive machining.

9. The method as claimed in claim 1, wherein the installation of the arc pipes follows the principle of installing a main pipe with a large diameter and a riser pipe and installing a branch pipe with a small diameter.

10. The method as claimed in claim 1, wherein fixing brackets are added to both sides of each turn-up, and the fixing brackets are provided to each arc-shaped pipe between 30 m and 50 m.

Technical Field

The invention relates to the technical field of building construction, in particular to a mechanized arc-making arc-shaped pipeline construction method.

Background

Traditional arc pipeline has two kinds of processing methods, one kind is to cut into the pipeline about 2 meters nipple joint, adopts the form of pipe fitting piece to carry out arc pipeline installation. The method not only increases the using amount of the clamp connecting pieces, but also increases the work amount of pipe cutting and groove cutting of the pipeline, causes labor waste and increases the construction cost. In addition, the joints are too many, and the hidden trouble of water leakage of the pipeline is easily caused by the large use of the pipe fittings.

The other method is carried out by using an artificial top bending method, namely, the pipeline divided into certain lengths is segmented (at least three segments) on site and simultaneously bent, and the pipeline is bent by using a self-made ground fixing support and a jack at the same time until the arc-shaped pipeline is prefabricated and formed. The construction method completely depends on manual operation, the number of required workers is increased along with the increase of the work amount, and the increase of the workers inevitably leads to the rise of the production cost. Because constructors have great differences in the aspects of mastering degree of the process, the use level of bending equipment, the self capacity and the like, even if the radian size, the radian uniformity, the integral aesthetic degree and the like of the same batch of pipes are greatly different after the pipes are bent, the arc-shaped pipes with different bending degrees are applied to actual construction, the aesthetic degree is not only strong, but also the installation safety is difficult to ensure.

Disclosure of Invention

The technical task of the invention is to provide a mechanized arc-making arc-shaped pipeline construction method aiming at the defects, the mechanized arc-making is adopted, the quality defect of the traditional arc-shaped pipeline construction process is solved, and the mechanized degree and the construction quality of the construction are improved.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a mechanized arc-making arc-shaped pipeline construction method adopts an arc-making machine to press an arc for an arc-shaped pipeline to be constructed, the arc-making machine comprises two fixed wheels which are symmetrically arranged in the horizontal direction and a driving wheel which moves in the vertical direction, and the circle center of the driving wheel is positioned on the central line of the connecting line of the circle centers of the two fixed wheels;

firstly, calculating the radian radius of an arc pipeline to be constructed according to the shape of a site to be constructed, wherein the radian of the arc pipeline can be one or more, and the radians of the arc pipeline can be calculated one by one when the radian is more than one;

then calculating a fixed wheel size table of the arc-making motor-driven wheel according to the radian radius;

processing an arc pipeline required by a to-be-constructed field according to an arc-making motor-driven wheel fixed wheel size table;

connecting the arc-shaped pipeline and additionally arranging a fixed bracket;

and testing and detecting the constructed arc-shaped pipeline.

The fixed wheel of the arc making machine is used as a fixed die, the movable wheel presses the arc on the pipeline through up-and-down movement, on the basis of the working principle of the arc making machine, an arc making movable wheel positioning table required by processing of a series of arc pipelines with different radians is made according to drawing design requirements, and arc pipeline processing is carried out according to a data table.

Preferably, the radian radius of the arc-shaped pipeline to be constructed is calculated as follows:

obtaining a center line of the arc-shaped pipeline according to the design shape of the site to be constructed, setting the center line as an arc-shaped line segment AB, and measuring the length L1 of a chord AB;

making a vertical line through the midpoint D of the chord AB, intersecting the arc AB at the point C, knowing that the vertical line passes through the center of a circle according to the sag theorem, and measuring the length L2 of the CD;

and if the circle center of the arc ab is a point O and the radius is R, the Rt delta AOD exists, the radius R1 is calculated according to the pythagorean theorem, and the radius R1 is the radius corresponding to the arc pipeline.

Preferably, the fixed wheel size calculation process of the arc-making motor-driven wheel is as follows:

setting the circle center of the wheel as a point E, the radius of the fixed wheel as R2, the middle point of a connecting line of the circle centers of the two fixed wheels as a point F, the center distance of the two fixed wheels as L, and the outer diameter of the prefabricated arc-shaped pipeline as D, then:

OE＝R1+R2+D/2，

EF＝1/2L，

in Rt Δ OEF, calculating the OF length by using pythagorean theorem;

the distance from the circle center of the driving wheel to the midpoint of the connecting line of the circle centers of the two fixed wheels is as follows:

OF-R1+R2+D/2。

during field processing, the required arc-shaped pipeline can be processed by controlling the distance between the movable wheel die and the vertical center of the fixed wheel die.

Preferably, the site to be constructed comprises arc pipelines with various radians, the radians and the radian radiuses of the arc pipelines are respectively calculated, and a corresponding fixed wheel size table of the maneuvering wheel for arc making is formed. All arc pipelines of the project are processed at one time only according to the fixed wheel size table of the movable wheel of the arc making machine, and the construction efficiency is improved.

Preferably, a measuring scale with the measuring precision of mm is fixed at the position of the driving wheel, a horizontal rule is used when the measuring scale is placed, the measuring scale is guaranteed not to be inclined, the position of the driving wheel is strictly controlled, and the horizontal rule is adopted to place the rear driving wheel and the fixed wheel of the steel pipes with various specifications for levelness correction; and a limiting block is arranged to prevent the driving wheel from falling too much, and the limiting block can be detachably arranged.

Preferably, the arc is manufactured by an arc manufacturing machine to reach the design radian through two times of arc manufacturing. The steel pipe has elasticity, and the pipeline can receive self resilience force to influence to make the pipeline stretch after making the arc once, and the radian is inconsistent with former calculation radian, leads to arc pipeline and structure radian nonconformity in the installation, and every steel pipe resilience force is inconsistent in size, and when pipeline and tube coupling, the slot is too big to the mouth department seam, seriously influences and suppresses the experimental success rate of trying water. To avoid this, each pipe is typically arc-bent twice to counteract the pipe resilience. After one-time arc making is finished, the second-time pipeline arc making can be carried out only by pressing down a reversing button of the arc making machine.

Preferably, for the inspection of the arc-shaped pipeline, every time 10 steel pipes are processed into a group, the first steel pipe, the middle steel pipe and the tail steel pipe are respectively taken out, the chord lengths of the processed arc-shaped pipeline are measured, if the chord lengths are consistent, the radians are consistent, and the arc-shaped pipeline is judged to meet the use requirement. If the chord lengths of the same group of pipelines are not consistent, checking whether the movable wheel mold is firmly fixed or not and whether the vertical center distance from the fixed wheel mold to the movable wheel mold is changed or not.

Preferably, after one steel pipe is subjected to arc making according to an arc length formula L ═ n pi r/180, the arc length is still the original pipe length, the corresponding central angle degrees of each radian of the project to be constructed can be calculated, the number of pipes required for processing the section of radian is calculated according to the total central angle degrees, and the waste of the pipes caused by excessive processing is prevented.

Preferably, the installation of the arc-shaped pipeline follows the principle of firstly installing a large-caliber main pipe and a vertical pipe and then installing a small-caliber branch pipe. As the whole pipeline is in an arc-shaped trend, the pipeline cannot be jumped during installation and must be continuously installed in sequence so as to avoid difficult connection between sections and influence on the overall performance of the pipeline.

Preferably, because the pipeline is arc-shaped, radial tension can exist in the pipeline during pressure test and normal operation of the system, and the larger the pressure is, the larger the radial tension is. The pipeline can produce along pipeline axial displacement under the influence of radial force, and pipeline Z type turn displacement is very obvious, consequently need add fixed bolster in the arc pipeline construction, prevents the pipeline displacement.

In order to ensure that the pipeline quality and the pipeline radian are complete under the pressure test and normal operation states of the arc-shaped pipeline, fixing supports are added on two sides of each turning bend, so that the axial force generated by radial stress of the arc-shaped pipeline is reduced; in order to prevent the pipeline from deforming caused by radial stress of the pipeline, fixing supports are arranged on the arc-shaped pipeline between every 30 meters and every 50 meters.

The steel pipe is pressed into the pipeline with the required radian through the arc maker and then is connected through the groove clamp, so that the operation is simple and the maintenance is convenient. Through the galvanized steel pipe of system arc machine tooling, pipeline radian one shot forming moreover, the original characteristic of pipeline and structure are not influenced, and system stability is good. The radian of the pipeline is controllable through the steel pipe processed by the arc making machine, the radian of the pipeline is matched with that of the corridor, the radians of the pipelines in rows are consistent, and the whole body is attractive and harmonious.

Compared with the prior art, the construction method of the arc-shaped pipeline for mechanical arc making has the following beneficial effects:

after the steel pipe is pressed into a pipeline with a required radian by the arc making machine, the steel pipe is connected by the groove clamp, so that the operation is simple and the maintenance is convenient;

by adopting the method, the galvanized steel pipe processed by the arc making machine is formed at one time, the original characteristics and structure of the pipeline are not affected, and the system stability is good;

the radian of the pipeline is controllable by using the steel pipe processed by the arc making machine, the radian of the pipeline is matched with the radian of a construction project corridor, the radians of the pipelines in rows are consistent, and the whole body is attractive and harmonious;

the radian of the pipeline is uniform and consistent by using the steel pipe processed by the arc making machine, the radian of the joint of the arc pipeline is smoothly transited, and the phenomenon of arc mutation is avoided;

compared with the traditional manual top bending construction technology, the arc making machine has the advantages that the processing efficiency is improved by about 80 percent, the labor cost is effectively reduced, the batch production can be realized, the use amount of pipe fittings is reduced by about 30 percent, the cost and the investment are low, and the benefit is good.

Drawings

FIG. 1 is a process flow diagram of an embodiment method for mechanized arc pipe construction;

FIG. 2 is an arc schematic of an arc machine;

FIG. 3 is a schematic diagram illustrating a radian radius calculation process of an arc pipeline to be constructed;

FIG. 4 is a project job site arc diagram;

FIG. 5 is a vertical distance calculation chart of the fixed wheel of the arc making machine.

In fig. 2 and 5, 1, a moving wheel, 2, a fixed wheel, O, a circle center (change of a follow-up wheel), R1, a radian radius calculated by a drawing, R2, a radius of the fixed wheel and the moving wheel, L, a center distance of the fixed wheel, D, and an outer diameter of a prefabricated pipe. Three radians are represented by 1, 2, and 3 in fig. 4, respectively.

Detailed Description

The invention is further described with reference to the following figures and specific examples.

The arc pressing machine comprises two fixed wheels symmetrically arranged in the horizontal direction and a driving wheel moving in the vertical direction, and the circle center of the driving wheel is located on the central line of the connecting line of the circle centers of the two fixed wheels.

Firstly, calculating the radian radius of an arc pipeline to be constructed according to the shape of a site to be constructed, wherein the radian of the arc pipeline can be one or more, and the radians of the arc pipeline can be calculated one by one when the radian is more than one;

then calculating a fixed wheel size table of the arc-making motor-driven wheel according to the radian radius;

processing an arc pipeline required by a to-be-constructed field according to an arc-making motor-driven wheel fixed wheel size table;

connecting the arc-shaped pipeline and additionally arranging a fixed bracket;

and testing and detecting the constructed arc-shaped pipeline.

The fixed wheel of the arc making machine is used as a fixed die, the movable wheel presses the arc on the pipeline through up-and-down movement, on the basis of the working principle of the arc making machine, an arc making movable wheel positioning table required by processing of a series of arc pipelines with different radians is made according to drawing design requirements, and arc pipeline processing is carried out according to a data table.

The construction process of the construction method is shown in figure 1, and the specific construction process is as follows:

firstly, preparation of construction

1. Material preparation

The field material acceptance is carried out, and the allowable deviation of the wall thickness, the ovality and the like of the galvanized steel pipe is in accordance with the national standard, has no obvious defects of damage and the like and is added with quality certification materials.

2. Machine preparation

The main machine for processing the arc-shaped pipeline is an arc maker, and the parameters of the arc maker are detailed in the following table:

TABLE 1 parameter table of arc maker

Model number	WG-219
		Range of bending diameter	Steel pipe (wall) less than or equal to phi 219Thickness 8mm)
Speed of bending	4-6 rpm
		Motor power	11kw
Power supply	Three-phase alternating current 380v, 50Hz
		Overall dimension of the main machine	1680*950*1500
Machine mass	1500kg

The main control system of the arc making machine is 3 circular dies which are arranged in a triangular shape, wherein the top is provided with a driving wheel die, the bottom is provided with two fixed wheel dies, the distance between the fixed wheel dies is 1.2m, pipelines with different radians can be processed by adjusting the vertical distance between the driving wheel die and the fixed wheel die, and the arc making principle is shown in figure 2.

3. Personnel preparation

Each arc maker is provided with 3 persons as an arc making team, wherein 1 person needs to completely understand the principle of an arc making process, skillfully master the operation rules of the arc making machine, is responsible for adjusting the distance between a driving wheel and a fixed wheel of the arc making machine, operates the arc making machine, confirms the arc forming condition of a pipeline on the arc making machine, and additionally 2 persons are used for assisting workers. The number of the groups to be specially needed is determined according to the site construction condition.

Second, radian calculation

1. Obtaining a midline of the arc-shaped pipeline according to the design shape of the site to be constructed, wherein the midline is set as an arc-shaped line ab, and the arc-shaped line ab is known in the figure 3 (figure I); measuring the length L1 of the chord AB (see FIG. II); a vertical line is made at the midpoint D of the crossing chord AB and intersects with the arc AB at a point C, and the length L2 (shown in figure III) of the line segment CD is measured by the vertical line passing through the center of the circle according to the principle of the sag; assuming that the center of the arc ab is located at the point O and the radius is R1, in Rt Δ AOD, the length R1 (see fig. iv) of the radius R1 and the radius R1 can be calculated according to the pythagorean theorem, i.e. the radius corresponding to the arc-shaped pipe.

2. Similarly, the radius R1 of all arcs of the project can be calculated.

Fig. 4 is a diagram of an arc structure of a corridor for a certain stadium project, the stadium coexists in 3 radians, and the radii R1 corresponding to each radian of the stadium calculated according to the above calculation method are 287.73m, 85.24m and 105.09m, respectively.

Third, calculating the distance between the dies

1. The principle of processing the arc-shaped pipeline by the arc making machine is as follows: a circular arc tangent to 3 dies of the arc maker is processed as shown in fig. 2. The circle center of the fixed wheel is a fixed point and cannot move, the circle center of the movable wheel can be adjusted up and down along the vertical direction, and the circle center of the prefabricated arc-shaped pipeline can be adjusted up and down along with the circle center of the fixed wheel.

As shown in fig. 5, if the circle center of the wheel is set as point E, the radius of the fixed wheel is set as R2, the midpoint of the connecting line of the circle centers of the two fixed wheels is set as point F, the center distance of the two fixed wheels is set as L, and the outer diameter of the prefabricated arc-shaped pipeline is set as D, then:

OE＝R1+R2+D/2，

EF＝1/2L，

in Rt Δ OEF, calculating the OF length by using pythagorean theorem;

the distance from the circle center of the driving wheel to the midpoint of the connecting line of the circle centers of the two fixed wheels is as follows:

HF＝OF-R1+R2+D/2。

during field processing, the required arc-shaped pipeline can be processed by controlling the distance between the movable wheel die and the vertical center of the fixed wheel die. The specific parameters are as follows:

fourthly, processing the pipeline groove

This construction is a mature construction process and is not described herein.

Five, arc pipeline processing

1. Firstly, selecting a mould with a corresponding specification according to the size of an arc-shaped pipeline to be processed, tightly fixing a changed moving wheel mould and a changed fixed wheel mould on an arc-making machine through bolts, and checking whether an equipment movement mechanism is loosened and whether a safety protection device is reliable.

2. A steel ruler with the measurement accuracy of mm is fixed at the position of the field driving wheel, and a limiting block (detachable) is arranged to avoid that the driving wheel descends too much to cause overlarge pipe arcing. When the steel ruler is fixed, the levelness of the rear driving wheel and the fixed wheel of each specification of the steel pipe is corrected by adopting a level ruler, the central distance of the fixed wheel mould of the movable wheel of the arc-making machine is slowly adjusted through the adjusting button of the movable wheel of the arc-making machine, and in order to prevent the radian deviation of the processed steel pipe, the distance of the mould is required to be adjusted according to the numerical calculation of a table.

3. And the steel pipe after the groove is placed on a fixed wheel mould on the arc maker by two persons, so that the steel pipe is clamped between the moving wheel mould and the fixed wheel mould, a mechanical power supply is started, and the arc maker automatically processes the pipeline.

4. The steel pipe has elasticity, and the pipeline can receive self resilience force to influence to make the pipeline stretch after making the arc once, and the radian is inconsistent with former calculation radian, leads to arc pipeline and structure radian nonconformity in the installation, and every steel pipe resilience force is inconsistent in size, and when pipeline and tube coupling, the slot is too big to the mouth department seam, seriously influences and suppresses the experimental success rate of trying water. To avoid this, each pipe is typically arc-bent twice to counteract the pipe resilience. After one-time arc making is finished, the second-time pipeline arc making can be carried out only by pressing down a reversing button of the arc making machine.

5. Taking out the processed arc-shaped pipeline and conveying the processed arc-shaped pipeline to the side, taking the first steel pipe, the middle steel pipe and the tail steel pipe respectively when 10 steel pipes are processed into a group, measuring the chord length of the processed arc-shaped pipeline, and if the chord lengths are consistent, ensuring that the radians are consistent, thereby ensuring that the processed arc-shaped pipeline meets the use requirements. If the chord lengths of the same group of pipelines are not consistent, checking whether the movable wheel mold is firmly fixed or not and whether the vertical center distance from the fixed wheel mold to the movable wheel mold is changed or not.

6. According to the formula of the arc length L (n pi r/180), after a steel pipe is subjected to arc making, the arc length is still the original length of the pipeline, the corresponding central angle degree of the project under 3 radians can be calculated, the quantity of the pipelines required for processing the section of radian can be calculated according to the total central angle degree, the pipeline waste caused by excessive processing is prevented, and the formula is detailed in the following table:

TABLE 3 pipe machining quantity table

7. Sign is posted to the arc pipeline that will process, and categorised the depositing prevents that collision, extrusion etc. from causing the pipeline radian to change.

Sixthly, mounting pipelines

The pipeline installation must follow the principle of firstly installing large-caliber main pipe and vertical pipe and then installing small-caliber branch pipe. As the whole pipeline is in an arc-shaped trend, the pipeline cannot be jumped during installation and must be continuously installed in sequence so as to avoid difficult connection between sections and influence on the overall performance of the pipeline.

1. Preparing the groove pipe section, the fittings and the accessories which meet the radian requirement, and cleaning the impurities in the pipe.

2. Checking whether the groove hoop rubber sealing ring is intact; the sleeve is sleeved on the end part of a steel pipe.

3. And the other steel pipe is close to the end part of the steel pipe clamped with the rubber sealing ring, and a certain gap is reserved at the two ends. The gap is generally kept about 2mm during construction.

4. And sleeving the rubber sealing ring on the top end of the other steel pipe, so that the rubber sealing ring is positioned in the middle of the joint, and smearing a lubricating agent (liquid detergent or soapy water can be used when no special requirement exists) on the periphery of the rubber sealing ring.

5. The radian of the two pipelines should be smoothly connected, and the radian transition is natural.

6. An upper clamp and a lower clamp are arranged on the outer side of the rubber sealing ring at the interface position, and the convex edge of the clamp is clamped into the groove.

7. The ear parts of the upper and lower hoops are pressed by hand force, and the flanges of the hoops are pressed by a hammer of a wooden hammer to tightly lean the upper and lower hoops.

8. The bolts are threaded at the positions of the hoop bolts, and the nuts are uniformly screwed, so that the rubber sealing ring is prevented from wrinkling.

9. Checking to confirm that the clamp convex edge is clamped into the groove along the whole circumference.

Seven, flushing and pressure testing

After the pipeline is installed, a pressure test is required, and the test pressure is executed according to the design requirement and the construction acceptance standard. Before pressure testing, whether the connecting pieces, the fixed support and the like are installed in place or not is comprehensively checked.

1. The pressure test of the pipeline can be carried out in a segmented, layered and segmented mode. When the pipeline is pressed, the hoop, the nut and other parts cannot be rotated.

2. A sectional test is adopted in the pressure test process of the system: the particularity of the arc-shaped pipeline is fully considered, the system is divided into three sections for testing, firstly, the pressure is increased to 0.6 time of the working pressure, the pressure is stopped being increased, the whole pipeline section is observed, whether the pipeline and the support have deformation conditions or not is checked, if no deformation occurs, the pressure is continuously increased to the working pressure, the whole pipeline section is observed again, the deformation conditions of the pipeline and the support are checked, if no deformation occurs, the pressure is increased to the specified pressure testing pressure, and the system pressure testing is completed according to the standard pressure testing time.

3. The hydrostatic test pressure must meet design requirements, and when the design is not noted, the pipeline test pressure is 1.5 times of the working pressure.

4. The pressure test method comprises the following steps: observing under test pressure for 10min, the pressure drop should not be greater than 0.02Mpa, and then lowering to working pressure for inspection, and should not leak.

5. And after the pressure test is finished, the pipeline system is flushed, and the flushing requirement is the same as that of other pipeline systems.

Mounting of a support

1. The type, material, processing size, mounting interval, manufacturing precision, welding and the like of the pipeline support and the hanging bracket meet the design requirements. The welding of the support and the hanger is neat in appearance, so that the welding is ensured to be thorough and firm, and the defects of welding leakage, lack of welding, cracks, meat biting and the like are avoided.

2. The spacing between the horizontal support and the hanger of the pipeline is not more than the specification of the following table:

TABLE 4 maximum spacing of the supports

3. The pipeline support and hanger fixed on the building structure can not affect the structure safety.

4. Fixing a support: because the pipeline is in the shape of an arc, the pipeline can have radial stress, and the stress is particularly prominent particularly when liquid in the pipeline is under pressure.

Therefore, in the process of a water filling pressure test (normal operation of the system), axial thrust of the pipeline, which is generated under the influence of radial force, is stretching of the arc-shaped pipeline, particularly, the deformation of the arc-shaped pipeline at the turning position of the pipeline is particularly obvious (in site construction, the electromechanical professional pipelines are crossed more), in order to ensure that the quality of the pipeline and the radian of the pipeline are complete under the pressure test and normal operation states of the arc-shaped pipeline, fixed supports are additionally arranged on two sides of each turning position, and the axial force of the arc-shaped pipeline, which is generated due to radial force, is reduced; in order to prevent the pipeline from deforming caused by radial stress of the pipeline, fixing supports are arranged on the arc-shaped pipeline between every 30 meters and every 50 meters. The method for fixing the bracket refers to the drawing, namely an indoor pipeline bracket and a hanging bracket (03S 402).

The present invention can be easily implemented by those skilled in the art from the above detailed description. It should be understood, however, that the intention is not to limit the invention to the particular embodiments described. On the basis of the disclosed embodiments, a person skilled in the art can combine different technical features at will, thereby implementing different technical solutions.

In addition to the technical features described in the specification, the technology is known to those skilled in the art.