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INTRODUCTION
Recently, I found that there are a lot of friends who search for seismic brackets in the background of the official account, and with the development of the national economy, safety is more and more important, and the mandatory use of seismic brackets also reflects this.
Although seismic brackets are widely used, there are not many friends who know about seismic brackets, and there are two main reasons for this:
First: although it is mandatory to use, the role of the seismic bracket is when it occurs, so for the vast majority of people, the role of the seismic bracket has no personal experience, so it is not so important.
Second, it was used less in the past, and it was a new thing for many people, so they didn't know much about it.
This article will share with you the relevant knowledge of seismic brackets.
Table of Contents
01 The principle of seismic bracket
02 Design and construction of seismic supports
03 Cost control point of seismic bracket
The principle of the seismic bracketYou have to manage the sharing exchange.
The seismic bracket is a protective measure for the pipeline when it occurs, and many people feel that the seismic bracket looks very thin, is it an IQ tax?In fact, this is caused by the ignorance of the role of anti-seismic brackets.
The traditional load-bearing support system is a support system with gravity as the main load (the traditional gravity support and hanger only bears the vertical load), in case of **, although the vertical bearing capacity is not a big problem, but when the transverse force of ** invades, due to the lack of transverse support structure, it is easy to cause large lateral swing, damage to adjacent facilities, and even fall off;
Although the seismic bracket is called the seismic bracket, in fact, the main role of the seismic bracket is not to bear the load, but to restrain the overall lateral and horizontal swing of the pipeline when it occurs, improve the integrity of the pipeline, lay the seismic support and hanger, change the dynamic characteristics of the pipeline system, change from soft to rigid, and the response is significantly smaller under the action of **. The effect of improving the overall toughness of the pipeline, or it can be understood that when the first comes, the seismic bracket can turn the pipeline into a relatively unified whole and strengthen the overall shear resistance. Reducing pipeline breakage and avoiding damage to buildings, equipment and personnel caused by pipeline falling has become a part of the overall seismic measures of the building.
The seismic support and hanger is divided into longitudinal and transverse support and hanger, and its force, laying, anchoring, etc. involve multidisciplinary and multi-field engineering, structural engineering, mechanical engineering, water supply and drainage.
At present, the role of seismic brackets in construction projects has been widely recognized, and seismic brackets have been applied to building water supply and drainage engineering, building electrical engineering, building HVAC engineering, solar photovoltaic systems, subway bracket systems and other systems.
Design and construction of seismic supportsYou have to manage the sharing exchange.
1.What situations need to be equipped with seismic brackets
Do all buildings need to be equipped with seismic supports?Of course not.
The need to install seismic supports depends on the local seismic intensity, fortification intensity, and the specifications of the pipes at several points of the building.
In the following cases, seismic brackets must be set up, and you can compare the project situation in your daily work to choose whether to set up seismic brackets or how many seismic brackets to set.
1.1. Seismic fortification intensity requirements
Building mechanical and electrical works in areas with a seismic fortification intensity of 6 degrees or more must be designed for seismic resistance (including underground comprehensive pipe gallery).
1.2 Installation professional requirements
Water supply and drainage
Indoor water supply, hot water and pipes with a diameter greater than or equal to DN65;
Pipes in the pumping room;
HVAC
Pipelines in boiler rooms, refrigeration machine rooms, and heat exchange stations.
The rectangular cross-sectional area is greater than or equal to 038 sq.m.;The diameter of the circle is greater than or equal to 07m duct system;
Anti-smoke exhaust ducts, accident ventilation ducts and related equipment.
Gas engineering
Gas pipelines with an inner diameter greater than or equal to 25mm.
Electrical Engineering
Electrical piping with an inner diameter of not less than 60mm;
Cable ladder frames, cable trough boxes, bus ducts with gravity not less than 150Nm.
equipment
The gravity in the suspended pipe is greater than 18kn equipment.
2.Composition of seismic brackets
The components of the building electromechanical seismic system include riser pipe bundles, steel beams and purlin clamps, annular pipe cranes, shockproof diagonal bracing systems, shockproof steel lifters and supports, etc.
3.Installation of seismic brackets
3.1 Electrical professional installation
3.2 HVAC Professional
3.3 Water supply and drainage majors
Cost control point of seismic bracketYou have to manage the sharing exchange.
Although the seismic bracket can bring higher seismic effect, it will also bring an increase in cost, and at the same time, for most cost practitioners, how to control the cost of the anti-seismic bracket has become a difficult point, and the cost control point and the best situation of the seismic bracket are analyzed as follows.
1.Cost control point of seismic bracket
Cost practitioners can start from the following aspects when reviewing seismic bracket schemes.
1.1. Review whether the project needs to be configured, and if so, the scope of use is controlled
As mentioned above, there are only the following cases where it is mandatory to install a seismic bracket, and other seismic brackets may not be installed.
Building mechanical and electrical works in areas with a seismic fortification intensity of 6 degrees or more must be designed for seismic resistance (including underground comprehensive pipe gallery).
Indoor water supply, hot water and pipes with a diameter greater than or equal to DN65;
Pipes in the pumping room;
Pipelines in boiler rooms, refrigeration machine rooms, and heat exchange stations.
The rectangular cross-sectional area is greater than or equal to 038 sq.m.;The diameter of the circle is greater than or equal to 07m duct system;
Anti-smoke exhaust ducts, accident ventilation ducts and related equipment.
Gas pipelines with an inner diameter greater than or equal to 25mm.
Electrical piping with an inner diameter of not less than 60mm;
Cable ladder frames, cable trough boxes, bus ducts with gravity not less than 150Nm.
The gravity in the suspended pipe is greater than 18kn equipment.
1.2 Control the spacing of the seismic brackets
The denser the seismic bracket, the better, too dense will reduce the effect to a certain extent, and at the same time will greatly increase the cost of the seismic bracket;It's too sparse and doesn't work.
All domestic water supply and fire piping systems greater than or equal to DN65 need to be installed 12m.
All domestic water supply and fire piping systems greater than or equal to DN65 require a lateral seismic support to be installed at 12 meters and a longitudinal seismic support at 24 meters.
Diameters greater than or equal to 0 are requiredAll duct systems at 7m are fitted with a transverse bracket at 9 m and a longitudinal bracket at 18m.
All electrical pipes with an inner diameter greater than or equal to 60 mm for power system pipes and cable trough systems, and all cable trays, cable ladders, cable trunks, and busways with a gravity greater than or equal to 150 Nm require a transverse bracket installation of 12 meters and a longitudinal bracket installation of 24 meters.
1.3 Control the height of the seismic bracket
This is particularly easy to overlook, but the cost implications are significant.
The seismic bracket ** is usually based on the lifting height of the pipe from the roof of 1 meterFor every 30 cm difference in height of the same material, the cost will be affected by more than 20%.
Therefore, it is necessary to comprehensively consider the setting according to factors such as pipe network and floor height, so as not to produce unnecessary waste.
1.4 Manufacturer selection of seismic bracket
Although the seismic bracket has been widely used, but there is no "leading brand" in the market at present, the brand is very mixed, according to statistics, the market share of each is not more than 1%, so we need to fully compare and choose when selecting the seismic bracket, and get the best through competition.
2.** case of seismic bracket
Approximate unilateral cost level of seismic support: according to the basement building construction area accounting, the unilateral cost including tax is about 12 20 yuan;According to the calculation of the construction area of the whole project, the unilateral cost including tax is about 3 8 yuan