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Analysis and prevention of common quality common diseases of curtain wall

  • Categories:Industry news
  • Author:
  • Origin:
  • Time of issue:2018-07-19 09:59
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(Summary description)

Analysis and prevention of common quality common diseases of curtain wall

(Summary description)

  • Categories:Industry news
  • Author:
  • Origin:
  • Time of issue:2018-07-19 09:59
  • Views:
Information

 

The curtain wall is the outer wall of the building. It does not bear weight and hangs like curtains. Therefore, it is also called "curtain wall". It is a lightweight wall with decorative effects commonly used in modern large and high-rise buildings. A building envelope structure or decorative structure that is composed of panels and supporting structure systems that can have a certain displacement capacity relative to the main structure or have a certain ability to deform itself and does not bear the role of the main structure (the outer wall frame-type support system is also a curtain wall system Of one).

  Among the modern curtain wall products, there are four categories: glass curtain wall, metal curtain wall, stone curtain wall, and clay panel curtain wall.

  Among them, the types of glass curtain wall mainly include frame-type open-frame curtain wall, frame-type hidden frame curtain wall, unit-type hidden frame curtain wall, unit-type open-frame curtain wall, point-type (cable) glass curtain wall, awning and lighting roof, etc .;

  The type of metal curtain wall mainly includes aluminum veneer curtain wall, perforated aluminum plate curtain wall, metal shutters (decorative shutters and rainproof shutters) and metal awnings, etc .;

  The stone curtain wall mainly includes a back bolt stone curtain wall, a through-hook stone curtain wall, and a plug-in hook stone curtain wall.

Secondly, according to the glue and waterproof form, the stone curtain wall and aluminum plate curtain wall can also be divided into open and closed curtain walls.

 

Beautiful building curtain wall case in modern city

  I. Common quality problems of curtain wall engineering

近年來,隨著建筑行業的新工藝、新材料逐年涌現,各大地產集團對品牌影響力和建筑質量的追求越來越高。幕墻作為高層與超高層建筑的好伙伴,其在工程中常見的各類問題亦是大家關注的重點。同時,幕墻工程中常見的質量通病,成為了一大研究課題。總結的幕墻質量通病主要有:

  1、幕墻系統水密性、氣密性能不符合要求(結構漏水、漏風),如圖:

 

  

        2、橫豎框的安裝精度問題,如圖:

 

  

        3、飾面質量問題,如圖:

 

    4、飾面不平和波光反色,如圖:

 

    5、縫隙不直,如圖:

 

    6、密封打膠的質量問題,如圖:

 

    7、飾面色差,如圖:

    8、震動和噪音,如圖:

 

 

    9、材料不符合要求,如圖:

    除以上9點外,還有一些在工程中的質量問題,細節應該引起注意。

    如玻璃附框與玻璃粘接時加工質量不好,超差嚴重,有玻璃附框不順直的質量問題,也有玻璃附框斷面與玻璃平面階差尺寸超差較大的,還有鋁附框45°對角接縫尺寸超差的等質量問題。

    鋼插芯與鋁框內壁間墊的尼龍墊片處理的不好,有的鋁框內壁與鋼插之間沒有墊片,達不到規范要求,而另一邊又墊的過多,且墊的不實,受力狀態不好,轉接件做法或伸縮縫做法不對。

 

二、幕墻工程質量通病在常見的問題中,我們分析存在的基礎和原因,主要有以下幾類,并提供給大家通常的解決方案。

問題1:幕墻系統水密性、氣密性能不符合要求(結構漏水、漏風)

解決方案:

  1、招標時選擇好的幕墻單位;

2、在方案設計論證時應重點研究防漏水方案和防水材料的選用,充分利用幕墻顧問公司審圖,優化設計方案;

   3、深化設計時嚴格審核防水節點,不能過分迷信顧問公司,必須嚴格把關;

  4、做好技術交底、嚴格執行施工樣板管理;

  5、加強材料進場驗收和質量把關;

  6、施工措施和安裝工藝要科學合理;

  7、做好隱蔽工程驗收和各部位的專項驗收記錄;

8、幕墻結構漏水主要部位一般是在采光頂,女兒墻以及不同結構和界面的交接部位,譬如鋁板與石材交接部位、單元板塊十字接縫、幕墻翻窗和雨篷排水溝邊緣等都是重點管理和檢查部位。

參見部分節點圖,窗口底橫框簽圖節點,防水效果不好。

窗口底橫框防水節點在現場被改成的節點,防水效果較好

問題2:橫豎框安裝的精度問題直接影響飾面的平整度和膠縫寬度等質量

解決方案:

1、制定合理放線方案和控制放線精度;

2、選用先進設備;

 

3、控制安裝質量,選擇好的施工隊伍和幕墻管理班子。

 

問題3:飾面不平和波光反射是幕墻飾面主要質量問題,直接影響建筑效果

解決方案:

1、方案設計和深化設計合理減小分格尺寸,使材料大小均勻,減少加工和安裝難度;

2、招標時限定材料品牌,選用和限定技術能力好的材料加工廠;

3、做好質量監造,把好材料出廠關;

4、做好材料運輸、儲藏和安裝過程程中的管理,鋁板、石材和玻璃的運輸、儲藏盡量不要疊摞過高,應采用直立碼放,底部墊軟木方;

 

5、嚴格施工樣板先行制,加強現場質量檢查和驗收。

 

問題4:打膠質量問題直接影響氣密性和水密性,影響建筑使用和感觀

解決方案:

1、選擇好的施工隊伍和幕墻管理班子;

2、施工樣板先行制,對打膠工培訓、考核上崗;

3、控制安裝質量,加強質量檢查和驗收。

 

問題5:飾面色差直接影響建筑感觀效果

解決方案:

1、招標時選擇好的幕墻施工單位,嚴格要求飾面質量標準,限定材料品牌和加工廠家;

2、駐廠監造,做好廠家石材預排版,把好出廠關,盡可能將石材毛料一次性訂貨加工;

3、減少鋁板訂貨批次,減少噴涂影響,并盡量縮短安裝周期,減少氧化褪色的影響;

4、玻璃配色或參數配置技術要求較高,盡量限定技術能力好的玻璃廠家,并盡量將玻璃原片一次訂貨加工,控制玻璃深加工質量;

5、加強材料進場和安裝前質量檢查和驗收,有條件盡量做好石材現場預排版;

6、控制安裝質量,及時檢查和驗收。

 

問題6:震動和噪音影響建筑使用功能

解決方案:

1.Bid selection of a good curtain wall unit and a good construction team and a good curtain wall project management team;

2. Make full use of the curtain wall consulting company to review plans and optimize the design plan (reduce or reduce the opening fan and increase the hardware lock point;

3.During the inspection and determination of the visual model or design template, find out in time, and find out unreasonable structural defects or processing process defects;

4. Discover construction technical quality problems through construction samples, strictly control quality standards, and strengthen installation quality inspection and acceptance.

 

Question 7: Non-compliance of materials directly affects the function of the building

solution:

1.Bid selection of curtain wall units with good integrity;

2. Strictly check when bidding, write down the technical requirements, strictly limit the material brand and do a good job of bidding review;

3. Avoid technically reducing the standards of the construction unit, strictly review the plans when deepening the design, and require the materials (models, specifications, configurations, components, etc.) to be clearly marked;

4.Sampling and confirmation of materials during bidding;

5.Strengthen the quality inspection, inspection and acceptance of materials;

6. Do quality inspection and acceptance of materials during construction.

 

to sum up:

The resolution of common engineering quality problems of curtain walls is not overnight. It should start from the foundation, start from the bit, check the details, and avoid the quality problems before and during the process. This needs to be coordinated with other professions first. Should pay attention to 4 points:

1. The design and construction of the curtain wall should consider the coordination and cooperation with the logo and the floodlight professional. The location of the logo and floodlight should be considered in advance. When the logo and floodlight need to be installed on the curtain wall, it must consider its impact on the curtain wall in advance. The force method and waterproof method ensure that the curtain wall structure is strong and reliable, and the seal is tight and durable.

2. There are several issues that need to be considered for the coordination and cooperation between the curtain wall and the electromechanical major:

1) Coordinated installation of electromechanical water pipes and curtain walls. Due to the inconsistency with the drainage channel of the curtain wall, the downpipe of Vientiane City was dismantled a lot, which may cause water leakage if it is not handled properly.

2) Coordinated installation of mechanical and electrical air inlet and exhaust vent and curtain wall shutters. Because the curtain wall louvers are mostly completed before the electromechanical duct is not installed, the electromechanical duct and the curtain wall louvers are often not completely consistent, resulting in the shutters around the electromechanical duct cannot be closed, resulting in water leakage. Therefore, it is recommended that after the contract is signed, professional construction professionals must connect the air vents to the louvers, and must close the louvers around the air duct with galvanized steel and thermal insulation rock wool, or agree to be sealed by the curtain wall unit for a second time. Blocking.

3) When the temporary cables of electromechanical wires are routed between layers, they will affect the blocking of the curtain wall layers. When the temporary cables are removed, the mechatronics professional (or the coordination curtain wall professional) should be used to restore the blocking between the layers to avoid noise and odor. Spread.

3. Coordination and cooperation between curtain wall and hardcover professional. The cooperation between curtain wall and hardcover professional should mainly consider the installation of indoor top curtain boxes or the closing between the hardcover ceiling and the curtain wall. In addition, it is necessary to pay attention to the closing between the ground and curtain wall. Pay attention to the closing between the partition wall and the curtain wall. If it is handled well, it will not only facilitate hardcover construction but also reduce noise.

4. The coordination of the curtain wall with civil waterproofing and outdoor landscape can avoid water leakage. When civil waterproofing or curtain wall construction, first consider whether it interferes with the curtain wall structure. Care must be taken to ensure that the buried parts of the curtain wall are not damaged as much as possible. After the curtain wall mullion welding is installed, the civil works should be coordinated to restore and repair the waterproof. The construction sequence and construction nodes of curtain wall, civil waterproofing and outdoor landscape should be studied in advance, unified and coordinated to ensure the construction quality of each specialty.

Secondly, in the way of quality management, we must adhere to six principles:

(1) Weekly quality report: Drawing on the experience of fine decoration supervision, NC report, x items;

(2) fines for quality problems that have not been rectified for a long time;

(3) Replace the unqualified quality inspector: 2 times;

(4) Weekly opening wall design and quality special meeting;

(5) Never rely too much on design institutes and consultants;

(6) Issue documents in time to remind the construction unit of quality problems and on-site management problems.

 

In short, before designing and constructing the curtain wall, try to coordinate and coordinate with each other in advance, coordinate with each other, and consider comprehensively. At the same time, adhere to the perfect quality management system, do a good job of prevention and timely treatment, or it may affect the overall building facade. The effect may also interact with other professions in subsequent construction, causing water leakage, air leakage and noise, etc., and affecting the construction quality.

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