CN116167146A - Modularized installation method for urban rail transit cold water machine room - Google Patents
Modularized installation method for urban rail transit cold water machine room Download PDFInfo
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Abstract
The invention discloses a modularized installation method of a cold water machine room of urban rail transit, which belongs to the technical field of rail transit and comprises the following steps: collecting a design drawing and a BIM model of a station, and carrying out field measurement and rechecking to obtain design data; building a cold water machine room prefabricated BIM model and a ring control machine room prefabricated BIM model according to the design data; optimizing the built prefabricated BIM model of the cold water machine room and the prefabricated BIM model of the ring control machine room by combining the connection relation, the space position and the steel bracket structure of each device in the cold water machine room and the ring control machine room, decomposing the cold water machine room and the ring control machine room into a cold water machine module, a cold water pump module, a chilled water pump module, a water separator module, a water pipe loop module and a water collector module, and outputting formed corresponding processing drawings; and finishing the manufacture and the installation of each module according to the processing drawing. The device has the characteristics of accurate design and good feasibility, shortens the working period and improves the safety.
Description
Technical Field
The invention relates to the technical field of rail transit, in particular to a modularized installation method of a cold water machine room of urban rail transit.
Background
Since the rail transit is put into operation, the urban development is affected immediately, almost all urban rail transit projects at present can strictly control the operation starting time point and the inverted construction period according to the operation starting time point, and the construction period nodes of the electromechanical decoration project serving as the last control project of the urban rail transit project construction must be strictly observed and cannot be delayed. However, due to the complexity of urban construction environment, the problem that the construction period of the front civil engineering is delayed becomes a common phenomenon, and the construction period control difficulty of the electromechanical decoration engineering is further increased. The optimization is carried out aiming at each key construction period control node, and the optimization becomes a core technology for the construction period control of electromechanical finishing engineering after the station, wherein the construction space is limited, pipelines are intricate and complex, and the installation of a cold water machine room of an urban rail transit station with a long construction period is the optimization key point.
The traditional installation technology of on-site cutting and blanking assembly of the existing cold water machine room has obvious progress, effectively reduces noise, dust and other environmental pollution, but has the defects of low installation efficiency, large workload of constructors and the like, and is mainly expressed as follows:
1. after all prefabricated pipelines arrive at the site, the prefabricated pipelines still need to be manually hoisted and connected, so that the connection quality of the steel pipes, equipment, valves and meters is unstable due to different technological levels of operators, and the hoisting difficulty of the site segmentation assembly is higher.
2. When equipment is installed in a staggered manner or the appearance of equipment, valves, meters and the like is changed on site, the prefabricated materials can be scrapped due to inconsistent lengths, inconsistent cuts and the like.
3. The construction process is still consistent with the traditional process, and only the time for processing the pipeline is shortened. Therefore, compared with the traditional installation period of more than 30 days, the installation period is shortened by only a few days, the installation time is still as long as 20-25 days, and the installation period is still a key technical node for influencing the progress control in the whole electromechanical installation engineering.
Disclosure of Invention
The invention aims to overcome the defects of low installation technical efficiency, large workload of constructors and unstable pipeline processing quality of a cold water machine room in the prior art, and provides a modularized installation method of the cold water machine room for urban rail transit.
In order to achieve the above object, the present invention provides the following technical solutions:
a modular installation method of an urban rail transit cold water machine room comprises the following steps:
s1: collecting a design drawing and a BIM model of a station, and carrying out field measurement and rechecking to obtain design data;
s2: building a cold water machine room prefabricated BIM model and a ring control machine room prefabricated BIM model according to the design data;
s3: the method comprises the steps of combining connection relations, space positions and steel support structures among all devices in a cold water machine room and a ring control machine room, optimizing an established cold water machine room prefabricated BIM model and a ring control machine room prefabricated BIM model, decomposing the cold water machine room and the ring control machine room into a cold water machine module, a cold water pump module, a chilled water pump module, a water separator module, a water pipe loop module and a water collector module, and outputting corresponding formed processing drawings, wherein the optimizing comprises the following steps: modifying equipment families, prefabricating module splitting, prefabricating module pipelines, prefabricating module supports, prefabricating and splitting and optimizing a machine room tube harness model;
s4: and according to the processing drawing, the manufacturing and the installation of the water chiller module, the cold water pump module, the chilled water pump module, the water separator module, the water pipe loop module and the water collector module are completed.
By adopting the technical scheme, modular assembly type construction is adopted, the method has the characteristics of safe installation, rapidness and high efficiency, the BIM technology is utilized to complete module design, the method has the characteristics of accurate design and good feasibility, the BIM technology is utilized to simulate the site conditions of a construction site, and after the influence of key factors such as transportation channels, equipment parameters and the like are fully considered, the division of each module and the segmentation and high-precision processing scheme of equipment, valves, meters, sensors, pipelines and supports in the modules are completed; the method has the advantages that the method adopts the industrial prefabrication of the modules, has the characteristic of excellent module manufacturing quality, and the control standard and the finishing quality of the measurement, cutting and welding of the pipeline sections in the modules are obviously improved by the technical level of specialized processing workers, and meanwhile, the manufacturing quality of the modules is ensured by using various flaw detection equipment, measuring equipment and test instruments under the condition that the processing sites are not limited; in the field construction stage, only the work such as hoisting, secondary carrying and assembling of the module is needed, the construction difficulty is reduced, the construction period is shortened to 5-6 days, meanwhile, the cross operation among the professions on the spot is avoided, the overhead operation of the scaffold is avoided, the construction safety risk brought by welding of pipelines and brackets in a narrow space and the fire operation of a construction site is avoided, the safety is high, and the installation quality of a cold water machine room is also improved.
As a preferred embodiment of the present invention, step S1 includes:
s11: measuring and rechecking a construction site, and verifying the building structure sizes of the cold water machine room and the environment-controlled machine room, the hoisting channel and the transportation channel, and the reserved holes of the building structure;
s12: and measuring and rechecking valve accessory parameters of the equipment according to the equipment list of the water chilling unit, and outputting a field measurement result.
As a preferred embodiment of the present invention, the design drawing in step S1 includes: design drawings of building structures, ventilation air conditioning systems and energy-saving control systems, and production drawings of water chilling units, cold water pumps, valves, meters and sensors;
the BIM model includes: civil engineering model, electromechanical comprehensive model, support and hanger model, water chilling unit and various equipment group models.
As a preferred embodiment of the present invention, in step S3:
the modifications of the family of devices include: modifying equipment families provided by equipment manufacturers or established according to drawings in the earlier stage according to the field measurement results to ensure that the geometric dimensions, materials, positions, inner diameters, outer diameters, lengths and heights of equipment are consistent with design files and technical files of the equipment manufacturers;
prefabricated module split includes: determining the limit geometric dimensions of each module according to the size data of the transportation channel, and decomposing the cold water machine room and the environmental control machine room into the cold water machine module, the cold water pump module, the chilled water pump module, the water separator module, the water pipe loop module and the water collector module;
prefabricated split of module pipeline includes: carrying out refined modeling and adjustment on the cold water machine module, the cold water pump module, the chilled water pump module, the water separator module and the water collector module, determining the placement positions of core equipment of the cold water machine module, the cold water pump module, the chilled water pump module, the water separator module and the water collector module, adjusting the placement positions, connecting the placement positions with an upper pipeline, and adding valves, meters and sensors;
prefabricated split of module support includes: adding a support bracket according to the position of a pipeline, and adding a pipe hoop for fixing the pipeline to finish the optimization of the prefabricated BIM of the cold water machine room;
the machine room management comprehensive model optimization comprises the following steps: leading a prefabricated BIM model of a cold water machine room into an electromechanical tube heald model, adjusting an air-conditioning water pipeline of the electromechanical tube heald model to be connected with a pipeline of the prefabricated BIM model of the cold water machine room, adjusting the positions of the pipeline and a support bracket near the cold water machine module, and ensuring that the distance between the pipeline and the support bracket near the cold water machine module and the cold water machine module is more than or equal to 300mm;
outputting the formed corresponding processing drawing comprises a pipeline prefabrication processing drawing, a module prefabrication assembly drawing and a bracket prefabrication processing assembly drawing.
As a preferred embodiment of the present invention, the splitting of the prefabricated module includes: according to the size of the cold water machine room, the number, the placement position and the size of each module are determined according to the sequence of the cold water machine module, the cold water pump module, the chilled water pump module, the water separator module and the water collector module, and then the number, the position and the size of the water pipe loop modules are determined.
In the step S3, in the steps of prefabricating and disassembling the module pipeline and prefabricating and disassembling the module bracket, an installation space of an insulation layer is reserved when the pipeline is arranged and the support bracket is added.
As the preferable scheme of the invention, the main channel width between 2 water chilling units is more than or equal to 1200mm when the water chilling units are arranged; the clear distance between the water chilling unit and the wall and the non-main channel are more than or equal to 1000mm; the distance between the protruding part of the water chilling unit and the power distribution cabinet is more than or equal to 1200mm; the clear distance between the device and other equipment is more than or equal to 1000mm; the clear distance between the water chilling unit and the pipeline and the bridge above the water chilling unit is more than or equal to 300mm; the horizontal evaporator of the water chilling unit is provided with a cleaning and maintaining space.
As a preferred embodiment of the present invention, the step S4 includes the steps of:
s41: cutting the steel pipe for the pipeline and the square steel for the support bracket by using an automatic feeding pipe cutting machine according to the pipeline prefabrication processing drawing, wherein the cutting precision is controlled to be +/-3 mm; the inclination deviation of the cut section of the steel pipe is not more than 1% of the outer diameter of the steel pipe and is not more than 3mm;
s42: derusting and perforating the square steel for the bracket;
s43: carrying out connection welding of the steel pipe and the flange;
s44: performing appearance inspection and inspection on the pipeline and the pipeline components;
s45: after the valve is subjected to strength test and tightness test, the valve is installed;
s46: after the pipeline is welded, spraying paint on the pipeline according to the pipeline prefabrication processing diagram;
s47: after the paint spraying is finished, the prefabrication processing of the pipeline module is finished according to the pipeline prefabrication processing diagram, the module prefabrication processing diagram and the module prefabrication assembly diagram;
s48: after finishing bracket welding according to the bracket prefabrication processing assembly drawing, firstly installing a pipeline supporting base, then lifting the prefabricated welded pipeline to a corresponding position by utilizing a mechanical lifting device, installing the pipeline on the bracket, and fixing the pipeline by utilizing a hoop.
As a preferred embodiment of the present invention, step S43 includes: if the thickness of the branch pipe is smaller than 6mm, the welding leg size of the fillet weld on the inner side of the flange is the thickness of the branch pipe, otherwise, the welding leg size of the fillet weld on the inner side of the flange is 6mm; if the thickness of the straight pipe is 1.4 times smaller than the thickness of the flange neck, the minimum welding leg size of the fillet weld at the outer side of the flange is 1.4 times larger than the thickness of the straight pipe, otherwise, the minimum welding leg size of the fillet weld at the outer side of the flange is the thickness of the flange neck.
As a preferable scheme of the invention, the modularized installation method of the urban rail transit cold water machine room further comprises the following steps: and flaw detection and geometric dimension detection.
Compared with the prior art, the invention has the beneficial effects that: the modular assembly type construction is adopted, the modular assembly type construction method has the characteristics of safe installation, rapidness and high efficiency, the BIM technology is utilized to complete the module design, the design is accurate, the practicability is good, the BIM technology is utilized to simulate the site conditions of a construction site, and after the influences of key factors such as transportation channels, equipment parameters and the like are fully considered, the division of each module and the segmentation and high-precision processing scheme of equipment, valves, meters, sensors, pipelines and supports in the modules are completed; the method has the advantages that the method adopts the industrial prefabrication of the modules, has the characteristic of excellent module manufacturing quality, and the control standard and the finishing quality of the measurement, cutting and welding of the pipeline sections in the modules are obviously improved by the technical level of specialized processing workers, and meanwhile, the manufacturing quality of the modules is ensured by using various flaw detection equipment, measuring equipment and test instruments under the condition that the processing sites are not limited; in the field construction stage, only the work such as hoisting, secondary carrying and assembling of the module is needed, the construction difficulty is reduced, the construction period is shortened to 5-6 days, meanwhile, the cross operation among the professions on the spot is avoided, the overhead operation of the scaffold is avoided, the construction safety risk brought by welding of pipelines and brackets in a narrow space and the fire operation of a construction site is avoided, the safety is high, and the installation quality of a cold water machine room is also improved.
Drawings
Fig. 1 is a flowchart of a modular installation method of an urban rail transit cold water machine room according to embodiment 1 of the present invention;
fig. 2 is a diagram showing the effects of splitting and arranging the chiller modules of the modular installation method of the urban rail transit chiller room according to embodiment 1 of the present invention;
fig. 3 is a block diagram of a prefabricated module pipeline splitting structure of a modular installation method of a cold water machine room for urban rail transit according to embodiment 1 of the present invention;
fig. 4 is a pipe prefabrication processing diagram of a modular installation method of an urban rail transit cold water machine room according to embodiment 1 of the invention;
fig. 5 is a module prefabrication processing diagram of a modular installation method of an urban rail transit cold water machine room according to embodiment 1 of the invention;
fig. 6 is a bracket prefabrication processing assembly diagram of the modular installation method of the urban rail transit cold water machine room according to the embodiment 1 of the invention;
reference numerals: 1-pressure gauge, 2-butterfly net, 3-temperature sensor, 4-soft joint.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should not be construed that the scope of the above subject matter of the present invention is limited to the following embodiments, and all techniques realized based on the present invention are within the scope of the present invention.
Example 1
A modular installation method of an urban rail transit cold water machine room, as shown in figure 1, comprises the following steps:
s1: collecting a design drawing and a BIM model of a station, and carrying out field measurement and rechecking to obtain design data;
specifically, step S1 includes:
s11: measuring and rechecking a construction site, and verifying the building structure sizes of the cold water machine room and the environment-controlled machine room, the hoisting channel and the transportation channel, and the reserved holes of the building structure, wherein the measuring and rechecking contents comprise: and when the deviation between the measurement and recheck data and the blueprint is larger than a deviation threshold value, modifying corresponding parameters in the BIM model according to the measurement and recheck data.
Table 1 building structure measurement and review record table
Note that: 1-cold water machine room length, 2-cold water machine room width, 3-cold water machine room bottom elevation, 4-2# hoisting port length, 5-2# hoisting port width, 6-hoisting port bottom and channel height difference, 7-transportation channel 1 section bottom elevation, 8-transportation channel 1 section bottom elevation, 9-transportation channel 1 section width, 10-transportation channel 2 section bottom elevation, 11-transportation channel 2 section width, 12-building structure water pipe preformed hole 1 diameter, 13-building structure water pipe preformed hole 1 bottom elevation, 14-building structure water pipe preformed hole 1 center distance 26 axial distance, 15-building structure water pipe preformed hole 2 diameter, 16-building structure water pipe preformed hole 2 bottom elevation, 17-building structure water pipe preformed hole 2 center distance 26 axial distance, 18-building structure water pipe preformed hole 3 diameter, 19-building structure water pipe preformed hole 3 bottom elevation, 20-building structure water pipe preformed hole 3 center distance 26 axial distance.
Summarizing: under the condition of field measurement data, the existing construction error is in an allowable range, the electromechanical modeling is not influenced, and the structural modeling modifies the model according to the real situation; the bottom of the lifting opening and the bottom of the channel have a height difference, and the lifting opening and the bottom of the channel need to be paid attention to in the transportation process, but do not need to be treated; the transport channel 1 section is provided with a transverse downward turning beam, and the bottom elevation of the downward turning beam restricts the height of the assembled installation module; the section 1 and the section 2 of the transportation channel are in a right angle turning relation, the length of an assembled installation module is restricted by a turning part, the transportation channel is recommended to be planned again, the temporary masonry of part of the pond body can be considered, and the temporary masonry is carried out after the module is in place.
S12: measuring and rechecking valve accessory parameters of equipment according to an equipment list of the water chilling unit, as shown in a valve accessory parameter rechecking list of equipment in table 2, and outputting a field measurement result, wherein the equipment list comprises: cooling water pump, chilled water pump, water collector, water separator, plate heat exchanger, materializer, back cleaning device.
Table 2: parameter rechecking table for equipment valve accessories
In the measuring process, when the difference between the measured data and the design data is large, the measuring and rechecking are carried out, and the measuring personnel and the recording personnel are exchanged during the measuring and rechecking. The method can also adopt three-dimensional laser scanning to manufacture a site point cloud model, and lays a more accurate foundation for the follow-up BIM modeling and optimization design.
The design drawing in step S1 includes: design drawings of building structures, ventilation air conditioning systems and energy-saving control systems, and production drawings of water chilling units, cold water pumps, valves, meters and sensors;
the BIM model includes: civil engineering model, electromechanical comprehensive model, support and hanger model, water chilling unit and various equipment group models.
S2: building a cold water machine room prefabricated BIM model and a ring control machine room prefabricated BIM model according to the design data;
s3: the method comprises the steps of combining connection relations, space positions and steel support structures among all devices in a cold water machine room and a ring control machine room, optimizing an established cold water machine room prefabricated BIM model and a ring control machine room prefabricated BIM model, decomposing the cold water machine room and the ring control machine room into a cold water machine module, a cold water pump module, a chilled water pump module, a water separator module, a water pipe loop module and a water collector module, and outputting corresponding formed processing drawings, wherein the optimizing comprises the following steps: modifying equipment families, prefabricating module splitting, prefabricating module pipelines, prefabricating module supports, prefabricating and splitting and optimizing a machine room tube harness model;
specifically, in the step S3:
the modifications of the family of devices include: modifying equipment families provided by equipment manufacturers or established according to drawings in the earlier stage according to the field measurement results to ensure that the geometric dimensions, materials, positions, inner diameters, outer diameters, lengths and heights of equipment are consistent with design files and technical files of the equipment manufacturers;
prefabricated module split includes: determining the limit geometric dimensions of each module according to the size data of the transportation channel, and decomposing the cold water machine room and the environmental control machine room into the cold water machine module, the cold water pump module, the water separator module and the water pipe loop module as shown in fig. 2;
specifically, the prefabricated module split includes: determining the limit geometric dimensions of each module according to the size data of the transportation channel, and decomposing the cold water machine room and the environmental control machine room into the cold water machine module, the cold water pump module, the chilled water pump module, the water separator module, the water pipe loop module and the water collector module;
prefabricated split of module pipeline includes: carrying out refined modeling and adjustment on the cold water machine module, the cold water pump module, the chilled water pump module, the water separator module and the water collector module, determining the placement positions of core equipment of the cold water machine module, the cold water pump module, the chilled water pump module, the water separator module and the water collector module, adjusting the placement positions, connecting the placement positions with an upper pipeline, and adding valves, meters and sensors;
meanwhile, when the water pipe is configured, the water pipe is strictly forbidden to be arranged in 1.5 meters above and near the power distribution cabinet and the switch cabinet.
Prefabricated split of module support includes: adding a support bracket according to the position of the pipeline, and adding a pipe hoop for fixing the pipeline to finish the optimization of the prefabricated BIM of the cold water machine room, as shown in figure 3;
specifically, in the steps of prefabrication and disassembly of the module pipeline and prefabrication and disassembly of the module bracket, when the pipeline is arranged and the support bracket is added, a pipeline heat preservation installation space with the thickness of 50mm is reserved.
When the water chiller modules are arranged, the main channel width among 2 water chiller units is more than or equal to 1200mm; the clear distance between the water chilling unit and the wall and the non-main channel are more than or equal to 1000mm; the distance between the protruding part of the water chilling unit and the power distribution cabinet is more than or equal to 1200mm; the clear distance between the device and other equipment is more than or equal to 1000mm; the clear distance between the water chilling unit and the pipeline and the bridge above the water chilling unit is more than or equal to 300mm; the horizontal evaporator of the water chilling unit is provided with a cleaning and maintaining space.
The machine room management comprehensive model optimization comprises the following steps: leading a prefabricated BIM model of a cold water machine room into an electromechanical tube heald model, adjusting an air-conditioning water pipeline of the electromechanical tube heald model to be connected with a pipeline of the prefabricated BIM model of the cold water machine room, adjusting the positions of the pipeline and a support bracket near the cold water machine module, and ensuring that the distance between the pipeline and the support bracket near the cold water machine module and the cold water machine module is more than or equal to 300mm;
outputting the formed corresponding processing drawing: outputting the formed corresponding pipeline prefabrication processing diagram as shown in fig. 4; a module prefabrication processing diagram is shown in fig. 5; prefabricating an assembly drawing of a module; the bracket is prefabricated, processed and assembled as shown in fig. 6.
S4: and according to the processing drawing, the manufacturing and the installation of the water chiller module, the cold water pump module, the chilled water pump module, the water separator module, the water pipe loop module and the water collector module are completed.
Specifically, the step S4 includes the following steps:
s41: cutting the steel pipe for the pipeline and cutting the square steel for the bracket by utilizing an MC-425CNC automatic feeding pipe cutting machine according to the pipeline prefabrication processing diagram, wherein the cutting precision is controlled according to +/-3 mm; the cutting quality must reach the cut surface to be smooth, the size should be correct, and there are no phenomena such as cracks, scales, burrs, convex-concave, necking, slag, oxide, scrap iron, etc.; the inclination deviation of the cut section of the steel pipe is not more than 1% of the outer diameter of the steel pipe and is not more than 3mm;
s42: derusting and perforating are carried out on square steel for the support, and the perforating is a prolate-ellipse hole or a round hole according to the drawing requirements. After the perforation is finished, rust prevention is carried out by utilizing a hot dip galvanization process;
s43: carrying out connection welding of the steel pipe and the flange;
the step S43 includes: if the thickness of the branch pipe is smaller than 6mm, the welding leg size of the fillet weld on the inner side of the flange is the thickness of the branch pipe, otherwise, the welding leg size of the fillet weld on the inner side of the flange is 6mm; if the thickness of the straight pipe is 1.4 times smaller than the thickness of the flange neck, the minimum welding leg size of the fillet weld at the outer side of the flange is 1.4 times larger than the thickness of the straight pipe, otherwise, the minimum welding leg size of the fillet weld at the outer side of the flange is the thickness of the flange neck.
After the welding is finished, flaw detection is carried out at the welding seam by using ultrasonic detection equipment. And (5) spraying silver paint to perform rust prevention treatment after the silver paint is qualified.
S44: performing appearance inspection and inspection on the pipeline and the pipeline components, and checking whether the length of the main pipeline, the position of the branch pipe, the length of the branch pipe, the model of the flange, the welding direction, the situation of opening holes on the pipeline and the like are consistent with a processing drawing; visual inspection of the weld joint is carried out to check the surface defects of the weld joint, such as undercut, weld flash, surface cracks, air holes, slag inclusion, welding penetration and the like; measuring the outline dimension of the welding seam by adopting a welding seam detector or a template; the surface of the welding seam of the bracket should be uniform and continuous, and the defects of holes, slag inclusion, cracks and the like are not required, so that burrs, burrs and the like are removed;
s45: after the valve is subjected to strength test and tightness test, the valve is installed;
in particular, the valves on the main must be operated one by one. The position and orientation of the valve mounting must meet design requirements. The valve handle on the horizontal pipe must not be facing downwards: the valve handle that hangs down the pipe should be oriented where convenient. The valve heads of the electromagnetic valve, the regulating valve, the thermal expansion valve, the lifting check valve and the like are all upward; the safety valve should be installed vertically at a position for maintenance, the outlet of the exhaust pipe should be directed to the safety zone, and the drain pipe should be installed on the drain pipe.
S46: after the pipeline is welded, spraying paint on the pipeline according to the pipeline prefabrication processing diagram;
s47: after the paint spraying is finished, the prefabrication processing of the pipeline module is finished according to the pipeline prefabrication processing diagram, the module prefabrication processing diagram and the module prefabrication assembly diagram;
s48: after finishing bracket welding according to the bracket prefabrication processing assembly drawing, firstly installing a pipeline supporting base, then lifting the prefabricated welded pipeline to a corresponding position by utilizing a mechanical lifting device, installing the prefabricated welded pipeline on the bracket, and fixing the prefabricated welded pipeline by utilizing the anchor ear.
The modularized installation method of the urban rail transit cold water machine room further comprises the following steps: and flaw detection and geometric dimension detection.
After the prefabricated module is produced, purging and cleaning (purging) should be performed.
Before the pipeline is flushed, the firmness of the pipeline support and the hanger should be carefully checked, the loose part should be reinforced, and the equipment and the pipeline which are not allowed to be flushed should be isolated.
Care should be taken in the pipe purge: washing with clean water; the water flushing flow rate must not be lower than 1.5m/s, and the flushing pressure must not exceed the pipeline pressure; the purging sequence is carried out according to the main pipe, the branch pipe and the drain pipe in sequence; the sectional area of the flushing calandria should not be smaller than 60% of the sectional area of the flushed pipe, and negative pressure is not formed during drainage; the flushing is continuously carried out, and the water color and the transparency of the discharge outlet are consistent with those of the inlet water visually, so that the discharge outlet is qualified. When the dirty liquid discharged from the cleaning cannot pollute the environment, the dirty liquid is forbidden to be discharged anywhere. Dirt blown out must not enter the qualified duct. After the pipe is purged and reset, other operations affecting the cleaning of the inside of the pipe cannot be performed.
The pipeline should be cleaned after being washed by water, and should be dried in time. During purging, a safety warning area is set, and a person at a purging port is forbidden. And (5) performing sealing protection on the pipe orifice after blow-drying.
Specifically, after the prefabrication of the installation module is completed, the prefabricated module is protected by a semi-finished product. Comprising the following steps: and wrapping unfixed prefabricated pipelines by using a bubble film and a straw rope, wherein the wrapping layer number of the bubble film is not less than 2. The paint surface of the pipeline is prevented from being scratched by friction in the transportation process; using a wood frame or a wood box to fixedly protect the installed equipment; the bare pipe orifice is covered by felt cloth and bound and fixed.
And binding corresponding signboards on each prefabricated module after the semi-finished product is protected. The content comprises: module name and number; project to be installed and station names; weight and size; a receiving unit; date of production.
After all is ready, the prefabricated module is sent to the construction site by using a truck. During the transportation, the modules should not be collided, extruded, thrown and hit by rain and snow. If the transport in thunderstorm weather is needed, a van type car is needed, the cargo is loaded in a room, canvas is covered, and damp-proof treatment is carried out.
The prefabricated module reaches the site, and through preliminary acceptance, the appearance of the pipeline and the bracket is confirmed to be free from deformation, and protective articles such as a bubble film, a wood frame, a wood board box, felt cloth and the like for protecting the semi-finished product are prevented from being damaged. And hoisting the prefabricated module into position.
Before the prefabricated module is hoisted, a special hoisting scheme is required to be compiled and approved. And meanwhile, the approval of the reported supervision unit passes. The hoisting process must strictly implement the hoisting scheme and related safety regulations.
Before the prefabricated module is hoisted, a marker pen can be used for marking a specific installation position on the basis of equipment according to the size of the module and used as an installation and positioning standard of the prefabricated module.
After the prefabricated module is hoisted and enters the station, the secondary carrying is completed by using a forklift, and the prefabricated module is placed on a corresponding equipment foundation. Wherein, the shock pad or the shock absorber is arranged in advance according to the design requirement under the equipment such as the water chilling unit, the cold water pump set and the like.
After the prefabricated modules are placed on the equipment foundation, the relative positions and elevations of the modules are determined by using a laser level gauge and a laser range finder to be consistent with the prefabricated BIM model of the cold water machine room, and the relative error is less than or equal to +/-3 mm.
Specifically, station datum points (datum points are located on two sides of a station track) are provided according to a third party measuring unit, and the station datum point elevations are measured to a station hall machine room by means of tools such as a level gauge, a total station, a tape measure and the like. During measurement, the slope and the direction of the slope of the station structure should be noted, and the measurement of the basic elevation is completed. And then, finishing foundation pouring according to a foundation plan of the cold water machine room, and installing yellow-black coated ground flat iron around the foundation after the foundation pouring is finished.
By adopting the technical scheme, modular assembly type construction is adopted, the method has the characteristics of safe installation, rapidness and high efficiency, the BIM technology is utilized to complete module design, the method has the characteristics of accurate design and good feasibility, the BIM technology is utilized to simulate the site conditions of a construction site, and after the influence of key factors such as transportation channels, equipment parameters and the like are fully considered, the division of each module and the segmentation and high-precision processing scheme of equipment, valves, meters, sensors, pipelines and supports in the modules are completed; the method has the advantages that the method adopts the industrial prefabrication of the modules, has the characteristic of excellent module manufacturing quality, and the control standard and the finishing quality of the measurement, cutting and welding of the pipeline sections in the modules are obviously improved by the technical level of specialized processing workers, and meanwhile, the manufacturing quality of the modules is ensured by using various flaw detection equipment, measuring equipment and test instruments under the condition that the processing sites are not limited; in the field construction stage, only the work such as hoisting, secondary carrying and assembling of the module is needed, the construction difficulty is reduced, the construction period is shortened to 5-6 days, meanwhile, the cross operation among the professions on the spot is avoided, the overhead operation of the scaffold is avoided, the construction safety risk brought by welding of pipelines and brackets in a narrow space and the fire operation of a construction site is avoided, the safety is high, and the installation quality of a cold water machine room is also improved.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. The modularized installation method of the urban rail transit cold water machine room is characterized by comprising the following steps of:
s1: collecting a design drawing and a BIM model of a station, and carrying out field measurement and rechecking to obtain design data;
s2: building a cold water machine room prefabricated BIM model and a ring control machine room prefabricated BIM model according to the design data;
s3: the method comprises the steps of combining connection relations, space positions and steel support structures among all devices in a cold water machine room and a ring control machine room, optimizing an established cold water machine room prefabricated BIM model and a ring control machine room prefabricated BIM model, decomposing the cold water machine room and the ring control machine room into a cold water machine module, a cold water pump module, a chilled water pump module, a water separator module, a water pipe loop module and a water collector module, and outputting corresponding formed processing drawings, wherein the optimizing comprises the following steps: modifying equipment families, prefabricating module splitting, prefabricating module pipelines, prefabricating module supports, prefabricating and splitting and optimizing a machine room tube harness model;
s4: and according to the processing drawing, the manufacturing and the installation of the water chiller module, the cold water pump module, the chilled water pump module, the water separator module, the water pipe loop module and the water collector module are completed.
2. The modular installation method of an urban rail transit cold water machine room according to claim 1, wherein step S1 comprises:
s11: measuring and rechecking a construction site, and verifying the building structure sizes of the cold water machine room and the environment-controlled machine room, the hoisting channel and the transportation channel, and the reserved holes of the building structure;
s12: and measuring and rechecking valve accessory parameters of the equipment according to the equipment list of the water chilling unit, and outputting a field measurement result.
3. The modular installation method of urban rail transit cold water machine room according to claim 1, wherein the design drawing in step S1 comprises: design drawings of building structures, ventilation air conditioning systems and energy-saving control systems, and production drawings of water chilling units, cold water pumps, valves, meters and sensors;
the BIM model includes: civil engineering model, electromechanical comprehensive model, support and hanger model, water chilling unit and various equipment group models.
4. The modular installation method of the urban rail transit cold water machine room according to claim 2, wherein in step S3:
the modifications of the family of devices include: modifying equipment families provided by equipment manufacturers or established according to drawings in the earlier stage according to the field measurement results to ensure that the geometric dimensions, materials, positions, inner diameters, outer diameters, lengths and heights of equipment are consistent with design files and technical files of the equipment manufacturers;
prefabricated module split includes: determining the limit geometric dimensions of each module according to the size data of the transportation channel, and decomposing the cold water machine room and the environmental control machine room into the cold water machine module, the cold water pump module, the chilled water pump module, the water separator module, the water pipe loop module and the water collector module;
prefabricated split of module pipeline includes: carrying out refined modeling and adjustment on the cold water machine module, the cold water pump module, the chilled water pump module, the water separator module and the water collector module, determining the placement positions of core equipment of the cold water machine module, the cold water pump module, the chilled water pump module, the water separator module and the water collector module, adjusting the placement positions, connecting the placement positions with an upper pipeline, and adding valves, meters and sensors;
prefabricated split of module support includes: adding a support bracket according to the position of a pipeline, and adding a pipe hoop for fixing the pipeline to finish the optimization of the prefabricated BIM of the cold water machine room;
the machine room management comprehensive model optimization comprises the following steps: leading a prefabricated BIM model of a cold water machine room into an electromechanical tube heald model, adjusting an air-conditioning water pipeline of the electromechanical tube heald model to be connected with a pipeline of the prefabricated BIM model of the cold water machine room, adjusting the positions of the pipeline and a support bracket near the cold water machine module, and ensuring that the distance between the pipeline and the support bracket near the cold water machine module and the cold water machine module is more than or equal to 300mm;
outputting the formed corresponding processing drawing comprises a pipeline prefabrication processing drawing, a module prefabrication assembly drawing and a bracket prefabrication processing assembly drawing.
5. The modular installation method of an urban rail transit cold water machine room according to claim 4, wherein the prefabricated module splitting comprises: according to the size of the cold water machine room, the number, the placement position and the size of each module are determined according to the sequence of the cold water machine module, the cold water pump module, the chilled water pump module, the water separator module and the water collector module, and then the number, the position and the size of the water pipe loop modules are determined.
6. The modular installation method of urban rail transit cold water machine room according to claim 4, wherein in step S3: in the steps of module pipeline prefabrication and module bracket prefabrication and splitting, when arranging the pipeline and adding the support bracket, a mounting space of an insulating layer is reserved.
7. The modular installation method of the urban rail transit cold water machine room according to claim 4, wherein the arrangement of the cold water machine modules is required to meet the requirement that the width of a main channel among 2 cold water machine sets is more than or equal to 1200mm; the clear distance between the water chilling unit and the wall and the non-main channel are more than or equal to 1000mm; the distance between the protruding part of the water chilling unit and the power distribution cabinet is more than or equal to 1200mm; the clear distance between the device and other equipment is more than or equal to 1000mm; the clear distance between the water chilling unit and the pipeline and the bridge above the water chilling unit is more than or equal to 300mm; the horizontal evaporator of the water chilling unit is provided with a cleaning and maintaining space.
8. The modular installation method of urban rail transit cold water machine room according to claim 4, wherein step S4 comprises the steps of:
s41: cutting the steel pipe for the pipeline and the square steel for the support bracket by using an automatic feeding pipe cutting machine according to the pipeline prefabrication processing drawing, wherein the cutting precision is controlled to be +/-3 mm; the inclination deviation of the cut section of the steel pipe is not more than 1% of the outer diameter of the steel pipe and is not more than 3mm;
s42: derusting and perforating the square steel for the bracket;
s43: carrying out connection welding of the steel pipe and the flange;
s44: performing appearance inspection and inspection on the pipeline and the pipeline components;
s45: after the valve is subjected to strength test and tightness test, the valve is installed;
s46: after the pipeline is welded, spraying paint on the pipeline according to the pipeline prefabrication processing diagram;
s47: after the paint spraying is finished, the prefabrication processing of the pipeline module is finished according to the pipeline prefabrication processing diagram, the module prefabrication processing diagram and the module prefabrication assembly diagram;
s48: after finishing bracket welding according to the bracket prefabrication processing assembly drawing, firstly installing a pipeline supporting base, then lifting the prefabricated welded pipeline to a corresponding position by utilizing a mechanical lifting device, installing the pipeline on the bracket, and fixing the pipeline by utilizing a hoop.
9. The modular installation method of urban rail transit cold water machine room according to claim 8, wherein step S43 comprises: if the thickness of the branch pipe is smaller than 6mm, the welding leg size of the fillet weld on the inner side of the flange is the thickness of the branch pipe, otherwise, the welding leg size of the fillet weld on the inner side of the flange is 6mm; if the thickness of the straight pipe is 1.4 times smaller than the thickness of the flange neck, the minimum welding leg size of the fillet weld at the outer side of the flange is 1.4 times larger than the thickness of the straight pipe, otherwise, the minimum welding leg size of the fillet weld at the outer side of the flange is the thickness of the flange neck.
10. The modular installation method of an urban rail transit cold water machine room according to claim 1, further comprising: and flaw detection and geometric dimension detection.
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