In the real estate development management system, design management undertakes marketing from the top to respond to customer needs; Undertake cost, construction and customer service downward to reflect cost constraints. Design management is the hub of the whole project management, which is extremely important and has multiple constraints. How to do it well?
Taking the door and window project as an example, to do a good job in design management, we must first grasp its characteristics. There are four sensitive points in door and window works. 1、 It belongs to the "visible part" and is a marketing sensitive point; 2、 The energy consumption of the external window is more than 50%, which is the weak part of energy consumption and the sensitive point of energy consumption; 3、 Its cost proportion is second only to the main building and installation, and it is a cost sensitive point; 4、 It is a common complaint hotspot, accounting for about 50% of the total complaints. It is a customer sensitive point. These four sensitive points must be considered comprehensively and cannot be separated, which increases the technical complexity and management difficulty of door and window works.
Today, I will talk to you about the common holes in the door and window works. Filling the holes is risky, so you should be careful!
The first pit: the smoke control design is ignored, and the natural ventilation is insufficient;
Specification requirements: The opening area of the external window of the front room of the fire elevator lobby and the smoke proof staircase must meet the requirements of 2 square meters per floor, the opening area of the external window of the shared front room must meet the requirements of 3 square meters per floor, and the sum of the total open area of the external window of the smoke proof staircase near the external wall every five floors should not be less than 2.0 square meters and other requirements.
Technical Standard for Smoke Control and Exhaust System of Buildings (GB51251-2017)
Common status of this pit:
① In the design of the scheme phase, the card limit design did not consider the impact of door and window openings plastering and window frames. For example, when the three in one front room needs natural ventilation, 3m2 of window area is required. The scheme design is 1.8 * 1.7=3.06m2. In fact, the opening (2cm on both sides, 10cm on both sides of the window frame and sash) is considered, and the impact of door and window segmentation (four doors are considered to be opened at this time) is considered, The actual ventilation volume is (1.8-0.02-0.1) * (1.7-0.02-0.1) - (1.8 * 0.065+1.7 * 0.065) (here is the sectional area at the division) ≈ 2.43m2, The actual ventilation volume is reduced by about 20%.
② The above natural ventilation requirements were not considered when the construction drawings of doors and windows were deepened, and the opening fan was insufficient.
The second pit: the door and window design did not consider the impact of thermal insulation "bite", which led to the thermal insulation of doors and windows, easy to have hidden dangers of water seepage and thermal bridge;
At the red circle, warm food
Common status of this pit:
① Corner window;
② Door and window at the splicing door;
For this reason, Evergrande Real Estate specially issued documents to reduce the problem of door and window bite, as follows (click to enlarge):
Source: Evergrande Real Estate
The third pit: the door and window design did not consider the impact of other spaces, and could not be opened or could not be opened for 90 degrees;
The window cannot be opened 90 degrees due to the influence of solar water tank
Common status of this pit:
① The impact of the solar water tank on the space is not considered, and the doors and windows cannot be opened 90 degrees;
② Shower and other spaces are not considered in the toilet and cannot be opened normally Exterior window ；
③ The height of the faucet is not considered in the kitchen, and the external window cannot be opened normally;
The fourth pit: the form of external windows of each building is inconsistent, and the owner complains;
Common status of this pit:
① For example, if the aluminum alloy profiles of Building 1 # and plastic steel profiles of Building 2 # are inconsistent with the delivery standards, complaints will be made;
② For example, if the aluminum alloy 5+12+5 in Building 1 and 5+12+5+12+5 in Building 2 are inconsistent with the energy saving standards, complaints will be made;
This article is easy to understand.
The fifth pit: the construction of doors and windows is not coordinated with the construction of guardrails, resulting in the doors and windows can not be opened;
The influence of guardrail is not considered, resulting in the increase of installation cost of guardrail in later stage
Fight with the guardrail after the corner of the outer window falls
Sixth pit: common designed pit
Common status of this pit:
① No safety glass is used at the position where safety glass is used;
Specification requirements:
1) Safety glass must be used for the following parts of the external windows of buildings
a: Tilting window
b : single block greater than one point five Square meter of glass
c : Other parts vulnerable to impact and impact that may cause human injury
d : The distance from the bottom edge of glass to the final decoration surface is less than five hundred French window of
e: 7 Layer and seven Open windows outside buildings above floors;
f : Special requirements for plastic steel: height from tread 900mm Below.
② The energy-saving design is not careful, and the K value, air tightness, water tightness and wind pressure resistance are mistaken
How to say, the standard and sense of responsibility of designers are almost impossible now
③ Wrong use of fire-resistant window
Not much more. After all, there are few people who understand the design of fire-resistant windows.
The aluminum alloy fire-resistant window is not available if you want to use it!
He Jiadong asked "refractory window" twice: Where are you? Why is it expensive| Cost summary of door and window works (VII)
Reflection on the application of "refractory window" in engineering
The seventh pit: not considering the height of the handle, unable to reach
Reasonable handle height, not higher than 1.8m, not lower than 0.7m
Common status of this pit:
① Kitchen window, especially when there is a basin;
② Bay window, especially when the guardrail is 900 high;
③ High window;
④ Open the window in the lobby;
⑤ A large window for business;
⑥ Other situations;
It has something to do with your altitude to stand on tiptoe and barely reach
