by Fans of the official account of the public building industry should be concerned.
Hello, you are very busy recently.
Please excuse me for the update.
Today, I’d like to share with you an article about seeing the notice on housing quality inspection in Beijing and what you think about problems related to assembly.
You are welcome to express your views in the comment area: I On January 10, 2022, the Beijing Municipal Construction Commission announced the results of the special inspection on the engineering quality of residential projects under construction in Beijing in December 2021.
A total of 32 residential projects in 16 districts of the city were inspected, including 6 construction projects in the main structure stage, decoration There are 26 construction projects in the mechanical and electrical installation stage.
The spot check focuses on the project entity quality, the quality behavior of the main participants and the performance of the supervision unit, and the third-party testing organization is entrusted to sample test the concrete strength, air tightness of doors and windows and other projects.
The problem of cast buildings is summarized as follows: 1.
The design plan of the assembly type construction drawing node needs to be refined.
In some assembly projects, there is a through gap between the precast balcony hanging plate and the main wall hanging plate in the design plan of the construction plan.
As the sealant has adverse factors such as service life (generally 15-25 years) and easy aging, it is easy to produce quality hidden dangers such as water leakage, ventilation and light transmission after delivery, and it is difficult to find and repair.
There are also some cast structural laminated plates as balconies, and no other structural measures have been taken.
Cracks are easy to occur on the upper surface of the root of the balcony plate, affecting the durability; Some project drawings lack node details of exterior wall insulation and waterproof, parapet insulation, etc.
2.
The components of cast finished products are damaged and the on-site construction quality is not up to standard.
Some precast outer wall outer leaf plates of a project are damaged and cracked; The external corner gap of some precast exterior wall panels is too large; The slab bottom joint concrete between some precast floors is not dense; 2、 Solution to the problem from the inspection results, the main contradiction of precast housing is still concentrated in the insufficient depth of drawings.
We have also written a lot of suggestions on how to improve the quality of precast architectural drawings before, such as: 1.
Reasonable design fee.
In the commercial market environment, the premise of high-quality design is reasonable design fee.
Low and ultra-low design fee can not support the income of excellent designers, resulting in low enthusiasm and initiative of designers, “fooling things” The inferior design result of “make do with it” is very likely.
Moreover, we all know that there are many differences between the traditional cast-in-place design of the assembly design, and the design result of the designer who does not pay attention to standardization and node design is often a “big pit”.
About how to charge for assembly design, we have written in previous articles of Zhuao.
You can refer to: Zhuao college? I don’t know how to collect money? The reference standard for charging for precast architectural design is coming! 2.
Reasonable design cycle ’ there are two more stages “planning stage” and “deepening design” for precast design and traditional cast-in-situ design.
During the signing of design contracts between many developers without precast construction experience and design institutes, the design cycle of compression design institutes is too short, It is based on the previous cast-in-situ construction, which has followed the previous “empirical thinking”, and some are even trilateral projects.
We do not know that the fault tolerance rate of precast buildings is very low.
The usual extensive construction and design methods are no longer applicable to precast buildings.
Unreasonable and insufficient design depth makes all kinds of mistakes, omissions, collisions, and errors in the process of project construction Problems such as insufficient depth and inability to settle accounts will continue to emerge.
Developers, general contracting units, design institutes, supervision units, component factories and deepening design units and other participating units are miserable.
Personnel from all parties sigh: it’s really “the general is incompetent and tired to death of the three armed forces”! Each unit is scolding and complaining about each other.
Each unit has its own problems and doesn’t know where the root of the problem lies.
As an old saying goes: firewood cutting does not miss firewood cutting workers.
The modular architectural design should have a reasonable design cycle.
For the modular special deepening design cycle, please refer to our previous articles of Zhuao.
The specific situation depends on the project: how long does it take for a set of drawings for the modular special deepening design of Zhuao college? Do you know? 3、 1.
In terms of developers, the quality and safety of housing is basically the responsibility system of the construction unit.
I have mentioned many times before that, to a certain extent, the decision-making architects of the design management department of developers are responsible for the success or failure of precast construction projects, The idea of “strong separation” of architects who lack assembly experience is the short board to be solved in the problem of assembly architecture.
As for how Party A controls the assembly project, please refer to our previous interview: Zhuao interview | how does the developer control the assembly project- Zhou Lipeng in the third issue of interview with Zhuao (10 questions): 2.
Construction: at present, there are many precast residential projects in China.
According to some precast projects I have been to, the on-site construction problems are: unfamiliar with the grouting method, insufficient grouting, wrong connection construction of precast components and cast-in-situ section connecting reinforcement Arbitrarily bend the “beard bar” of precast components, the sleeve is misaligned and cannot be installed, etc.
In addition to technical disclosure, construction organization design and other control methods, I recently saw that Guangzhou has done a pilot work of on-site assembly skilled worker allocation for the implementation of housing construction projects.
I think it is very good.
It is a measure to improve on-site assembly construction..
