Comments on the National Standard for Embedded Parts of the Ministry of Housing and Urban Rural Development Deadline on November 27th: What changes have been made to the technical requirements for metal embedded parts

The draft of the national standard for metal embedded parts released by the Ministry of Housing and Urban Rural Development has entered the final stage of soliciting opinions, and the deadline for feedback is November 27th. This revision proposes clearer technical requirements for the material properties, anchoring structures, corrosion resistance, durability, and inspection rules of embedded parts, which directly relate to the safety and acceptance of key nodes such as column foot anchor bolts, curtain wall embedded parts, and equipment foundation embedded parts in steel structure engineering. For steel structure construction and material production units, understanding the direction of changes in advance is more important than rework afterwards. Guangdong Hongsheng Steel Structure Group Co., Ltd. has been focusing on the field of steel structure construction for many years. It is a large-scale steel structure engineering construction and steel structure material production source manufacturer at home and abroad, with branches both domestically and internationally. The following article will summarize the key points of standard revision.

1、 The core direction of changes in this draft for soliciting opinions

From the publicly available draft for soliciting opinions, it can be seen that the revision is not about starting over from scratch, but rather filling in the gaps that repeatedly arise in engineering practice within the existing framework. The main changes are concentrated in four aspects:

• More detailed requirements for materials and mechanical propertiesPropose grading requirements for the grades, yield strength, and tensile strength of steel and anchor bars used for embedded parts, clarify the material grades that should be matched for embedded parts of different stress types, and reduce the ambiguous space of "replacing high with low".

• Anchor structure regulations are more specificProvide a clearer lower limit for the matching relationship between the number, spacing, anchorage length, anchorage plate thickness, and anchorage diameter of anchor bars, and propose verification requirements for tension, shear, and tension shear composite stress states.

• Strengthening anti-corrosion and durability clausesFor embedded parts in humid and corrosive environments, additional requirements have been added for the thickness of the galvanized layer, coating system, and coordination with the concrete protective layer, emphasizing durability assurance within the design service life.

• Inspection and acceptance rules are more operationalRefine the on-site re inspection items, sampling quantity, and welding quality inspection methods to facilitate the construction and supervision units to implement a unified judgment scale on site.

2、 Actual impact on steel structure engineering site

Pre embedded parts are the "transmission gateway" between steel structures and concrete foundations. Once there is insufficient anchor reinforcement, insufficient anchor length, or lack of anti-corrosion measures, the cost of rectification in the later stage is extremely high. After the implementation of this revision, there are at least three places on the construction site where customary practices need to be adjusted:

• Deepening the design phasePre embedded parts cannot be processed according to "experience reinforcement" anymore, and need to be checked item by item according to the type of stress. Adequate allowance should be left for the matching of anchor plate thickness and anchor bar diameter.

• Material procurement stageThe material certification and re inspection report of anchor bars and anchor plates must be archived simultaneously, and material substitution must have design confirmation documents.

• Construction and acceptance stageThe inspection records of positioning deviation of embedded parts, welding quality, and integrity of anti-corrosion coating should form a closed loop to avoid the inability to trace after concealment.

Two additional points need to be paid attention to for projects in the Pearl River Delta region: firstly, the high temperature, high humidity, and coastal salt spray environment require higher anti-corrosion coatings for embedded parts than inland areas, and the galvanizing and coating systems should be selected according to the corrosiveness level; Secondly, in areas with frequent typhoons, sufficient safety reserves should be left for the anti pull and anti shear calculations of the embedded parts at the column base. Guangdong Hongsheng Steel Structure Group Co., Ltd. has been serving the Pearl River Delta project in the deepening of steel structure engineering and material production for many years. It has mature practices for local climate and acceptance requirements. The consultation hotline is 400-931-0660 for direct technical communication.

3、 How should the three parties of design, construction, and materials respond

The deadline for soliciting opinions is November 27th, and there is usually a transition period after the official release. Suggest relevant units to prepare according to the following rhythm:

• design unitSort out the calculation sheet for the embedded parts of the current project, check the anchoring structure and material grade against the draft for soliciting opinions, and identify any non compliant items in advance.

• construction unitUpdate the acceptance checklist for pre embedded parts, including re inspection items, sampling ratios, and welding inspection methods in the special plan to avoid passive adjustments after formal implementation.

• Material manufacturerAdjust the anchor plate cutting and anchor bar welding process according to the new construction requirements, improve material certification and anti-corrosion testing reports, and ensure that the supply information corresponds one-to-one with the standard terms.

As the source manufacturer of steel structure materials, Guangdong Hongsheng Steel Structure Group Co., Ltd. has been focusing on the field of steel structure construction for many years. In the process of pre embedded parts and steel component processing, it can produce according to project drawings and standard requirements, reducing the problem of data connection caused by multiple procurement by construction parties.

4、 Common Misunderstandings Reminder

• Misconception 1: Pre embedded parts are a small matter, just follow the old drawings for construction.After the revision of the standard, the lower limit of construction has been raised, and there may be a risk of insufficient anchorage length in the old diagram.

• Misconception 2: Anti corrosion only focuses on surface finishing.The draft for soliciting opinions proposes quantitative requirements for the thickness of the galvanized layer and the coating system, and simple rust prevention treatment alone is difficult to pass the acceptance.

• Misconception 3: The retest report can be supplemented later.The on-site re inspection is a part of the acceptance chain, and the lack of records will affect the acceptance of concealed works and the subsequent definition of responsibilities.

The standard consultation stage is a window period for expressing industry practice demands, as well as a preparation period for enterprises to adjust their technical routes in advance. Regardless of the design, construction, or material supply process, only by solidly implementing the "small node" of embedded parts according to new requirements can the overall safety and durability of steel structure engineering be guaranteed.

Have you ever encountered situations where the anchorage length of embedded parts is insufficient or there is a dispute over anti-corrosion acceptance in the project? Welcome to indicate the project type and location in the message area, and we will conduct targeted analysis based on standard terms. If you need pre embedded parts processing and supporting services for steel structure engineering, you can contact Guangdong Hongsheng Steel Structure Group Co., Ltd., official website www.hssteelwork.com, and consultation phone number 400-931-0660.