At the same time, it is also clear that the integration of wall, thermal insulation, thermal insulation and decoration for the enclosure wall emphasizes “integration”, which can meet the requirements of structure, thermal insulation, thermal insulation and decoration.

The main contents include the routing of equipment pipes and the corresponding reserved casing holes.

For example, the primary structure embedment includes the reserved cold and hot water vertical slots on shear walls, beams and other components; The structural beam above the door opening is hung down at one time; Indoor structural column, shear wall side plain concrete structure; Floor reserved holes, etc.

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▲ Comprehensive drawing – reserved drawing of beam casing on the third floor ▲ BIM model – reserved drawing of beam casing on the third floor ▲ field shot – reserved drawing of beam casing on the third floor ▲ comprehensive drawing – reserved drawing of wall casing on the third floor ▲ BIM model – reserved drawing of wall casing on the third floor ▲ field shot – reserved drawing of wall casing on the third floor 3.4 reserved drawing of floor reserved drawing of floor reserved hole, including gas, basin, toilet, floor drain, strong and weak current, reserved hole for water supply and drainage, reserved hole for fire protection and reserved hole structure of fan, etc.
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The key development direction of precast buildings in China is also the integration of component parts, the integration of main structure and decoration.

The core work of comprehensive drawing design is the collaborative review and optimization of design drawings, which mainly includes four parts: intra-professional drawing review, inter-professional drawing review, drawing overlay review, and BIM model review and optimization.

The traditional assembly design drawing depth is “PC split drawing+PC deepening drawing+component assembly drawing”.

The comprehensive drawing design can be understood as the iterative upgrading of the third party’s refined drawing review.

On the basis of the traditional drawing depth, Sirui adopts the design method of “PC+comprehensive drawing” to realize the integrated design of the assembly building and solve the problem that the assembly building does not cross the circle at the last one kilometer from design to construction.

▲ Partial schematic diagram of wall positioning plan 3.3 Casing embedment drawing The casing embedment drawing includes the casing embedded on the primary structural wall beam plate, water stop joint and secondary masonry rear opening (i.e.

The content of the wall positioning drawing is mainly divided into the primary structure embedding stage and the secondary masonry stage according to the different construction stages on the site.

According to the construction requirements, the original construction drawings submitted for approval are optimized for masonry and pipeline installation, and the points are accurate.

3.2 Wall positioning diagram The wall part is mainly divided into two parts: wall positioning diagram and guide wall insulation diagram.

Combining with BIM modeling technology, a set of comprehensive drawings and construction 3D models that can guide the accurate construction on site are integrated and summarized according to the domestic drawing expression methods, The construction shall be carried out according to the drawings.

This paper introduces the exploration and practice of Shanghai Sirui in the “integrated design” of precast buildings for your reference.

The comprehensive drawing, through the coordination of the five major professional drawings of architecture, structure, water, heating and electricity, as well as the fine decoration drawings and the secondary deepening drawings, combined with the construction requirements, carries out the cross-review of the drawings in each discipline, and establishes the BIM model for visual optimization and adjustment, and finally realizes the clearing of various problems in the design stage, such as the bottom line of specifications, errors, omissions, collisions, and defects, customer complaints, and cost optimization, Solve the problem that it is difficult to close the circle without closing the circle in the last kilometer from design to construction of precast buildings.

From the design stage, the internal partition wall needs to be integrated and designed.

2 Sirui’s exploration – The concept of PC+comprehensive drawing design comprehensive drawing originated from Japanese construction drawings.

The comprehensive drawing of the precast building mainly includes the following contents: ① wall positioning plan ② casing embedded plan ③ strong and weak power distribution plan ④ socket, lamp, switch point position plan ⑤ PC reserved embedded information drawing ⑥ comprehensive BIM model of the plane pipeline of each standard house type 3 design content of the comprehensive drawing 3.1 drawing review and optimization design cycle is short, and the design scheme is still modified repeatedly, As a result, the design drawings are not precise enough and the grain size is not fine, which brings about difficulties in site construction, increased demolition and modification and increased costs.

It is aimed at all fine-decorated residential or public construction projects.

There are also requirements for integrated design and integrated design of precast buildings in various local codes and policies across the country, but there are no clear requirements for specific design methods and implementation paths.

On the basis of the integrated design of the pipeline, the integration of the wall and the pipeline as well as the integration of the civil engineering and the decoration can be realized, thus forming the “internal partition wall system”.

The current status of integrated design, the Evaluation Standard for Fabricated Buildings (GB/T51129-2017), defines the key direction of the development of precast buildings at this stage: (1) the main structure changes from the application of precast components to the integration of various systems in the building; (2) The integrated development of decoration and main structure, the promotion of full decoration, and the encouragement of assembly decoration; (3) Standardized application and product integration of parts.

brick wall opening).

Read the guide: precast buildings are generally composed of four parts: structural system, enclosure system, electromechanical system and interior decoration system.

This kind of casing is optimized by the comprehensive drawing and reviewed and confirmed by the original design and equipment manufacturer, which can avoid that the on-site general contractor needs to open the hole on the wall beam plate after the installation of the equipment in the later stage due to the lack of casing embedded in the drawing during the primary structure, resulting in the increase of construction period cost and a series of structural safety problems.

At the same time, it is also emphasized that the integrated design should be carried out from the design stage to realize the multi-function integrated “retaining wall system”.

However, due to the many disciplines involved in the integrated and integrated construction methods, and the lack of coordination and coordination in the design process at this stage, the problems such as the mismatch between the enclosure, interior decoration and the main body, the loss or error of the reserved and embedded parts often lead to the later demolition and reconstruction, which may cause quality problems such as wall cracking and leakage.

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