Who is responsible for the wave deformation of the joint of the aluminum plate pressure strip?

Views:45 Author:Site Editor Publish Time:2026-09-03 11:09:39 Orgin:Site

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Passing by a commercial project designed in 2022 and just put into operation in 2025 over the weekend.

The exterior facade is made of a large area of 3mx1m large-sized aluminum veneer, and the joints are constructed with embedded aluminum alloy pressure strips - the original intention is to hide the sealant and achieve a clean and simple facade effect.

But there is a significant difference in the actual scene: the 3-meter-long aluminum pressure strip undulates in waves, creating a chaotic appearance; The 1-meter short edge is relatively flat. The expected simplicity has not been realized at all.

Realistic scene of wave deformation of aluminum plate pressure strip on site

Detailed drawing of original pressure strip nodes for the project

Based on the drawings and on-site issues, clarify: what are the omissions in the design, construction, and party A of this large-scale wave defect, and how to avoid it in advance for subsequent projects.

A. Root cause of the problem: Each party has its own shortcomings

1.Curtain wall design: Insufficient consideration of node adaptability

The architect's demand is very clear: they do not want to expose the adhesive joints, and pursue a clean facade that is almost closely packed. The curtain wall designer also designed concave aluminum pressure strip nodes according to the requirements, deliberately retracting the pressure strip inward to weaken the visual presence of the joint.

But the entire set of nodes only stays at the level of drawings and has not been optimized for adaptation with the 3-meter ultra large board, resulting in three major flaws:

Firstly, the temperature expansion and installation deviation of the large board were not considered. Previously, we specifically discussed the logic of dense assembly of large plates - a large area of metal sheet must reserve sufficient expansion and contraction adjustment allowance, and this set of pressure strip structures has very little adjustment space.

Secondly, the 3-meter long pressure strip itself has weak stiffness. Aluminum plates are fixed with conventional corner brackets at a single point, and slight displacement of the plate can cause pulling and stretching of the pressure strip, making it prone to bending and waves.

Thirdly, simply copy the mature nodes of small-sized aluminum plates. The small-sized aluminum plate can be controlled with this set of pressure strips, but when placed on a 1mx3m large plate, the difficulty of landing doubles.

2.Construction unit: Lack of fine chemical process

The flatness of the 1-meter short side pressure strip is still acceptable, while the 3-meter long side has a large area of waves, indicating that this structure is not completely incapable of producing qualified results, but the investment in fine construction is insufficient.

The 3-meter long aluminum pressure strip itself has great flexibility, and during installation, it needs to be leveled in sections, temporarily fixed at multiple points, and uniformly calibrated for the straightness of gaps, which belongs to slow work and fine work.

The on-site construction schedule is tight, and the team lacks a refined construction awareness. During installation, there was no step-by-step calibration and straightening, only rough fixation. The promise made during the bidding phase was to achieve perfect implementation, but after entering the site, the construction was hastily carried out, ultimately resulting in continuous wave defects.

Regardless of appearance, if the deformation of the pressure strip is too large, it may weaken the waterproof and sealing performance of the joint, and there is a long-term risk of water leakage.

3.Party A: Lack of preliminary implementation demonstration

n the scheme stage, only the minimal facade effect of the architect was recognized, and no special demonstration was organized for the curtain wall. The landing scene of similar large plate layering was not investigated in advance, and the construction difficulty and risk were not predicted.

When the main body is completed and the curtain wall is widely installed, it is already very close to the opening time, and there is no time for rectification and rework. The defects can only be retained as they are.

In addition, when selecting design and construction units, it is easy to be attracted by large courtyards, big brand qualifications, and master names, ignoring the front-line responsible persons who are stationed throughout the entire process and responsible for implementation. The core work of a project is often undertaken by inexperienced newcomers.

B.How to completely avoid new projects?

1.Design end: Customize the system according to the size of the board

A set of nodes cannot accommodate all specifications of aluminum plates. It is necessary to match the corresponding joint construction according to the length, width, and area of a single board:

·Priority should be given to enlarging the adjustment allowance and increasing the cross-sectional stiffness of the pressure strip for large-sized metal plates

·Extended pressure strip with multi-point limit fixation [such as two leg type]

·Proactively output the landing risk to the architectural scheme, balancing the requirements of minimalist appearance, temperature expansion, and construction fault tolerance

·Ideal nodes where the upper limit of the design process is too high and it is difficult to implement on site

2.Construction end: pre evaluation, team level control

·Fully understand the difficulty of node construction during the bidding stage, and clarify the corresponding labor and construction period costs for fine leveling and segmented calibration

·For fine facades such as long strip pressing and dense splicing, a skilled specialized team will be deployed separately to develop specialized installation procedures

·Sample first: Before large-scale construction, make a solid sample first, confirm that the straightness of the pressure strip meets the standard, and then install it on the wall in bulk

3.Party A's control end: preliminary demonstration, investigation of front-line responsible persons

·Organize a special seminar on architecture, curtain wall, and cost before finalizing the plan, collect real-life scenarios of the same scale, and predict risks

·When selecting cooperative units, we should not only consider qualifications and reputation, but also focus on verifying past similar project implementation cases of the main designer and on-site supervisor who have followed up on the entire project

Reserve a reasonable construction period for the fine curtain wall process to avoid forcing the team to simplify the process by reversing the opening schedule

C.Summary

This type of rolling wave overturning is never the fault of a single party:

·Design blindly copying nodes and ignoring the deformation characteristics of large plates is a congenital weakness

·Construction compression process, lack of refined control, and on-site amplification issues

·The first party lacks pre demonstration and team screening to identify the key source of error

。The minimalist effect of the facade should be grounded and not just limited to the rendering. From scheme demonstration, node deepening to on-site construction, each stage must be matched with corresponding processes, construction periods, and control standards. Missing one ring will eventually turn into visible flaws on the facade.