Drawing Rules and Standard Detailing Drawings of Ichnographic Representing Method for Construction Drawings of R.C. Structures (Spread Footings, Strip Foundations, Raft Foundations and Pile Foundations)
1. This drawing collection is based on the MOHURD document JIANZHIHAN [2016] No.89 Notification of Distributing the Working Plan of Compiling the National Standard Design for Buildings in 2016.
2. This drawing collection is the national building standard design drawing collection for construction drawings of R.C. structures using ichnographic representing method (IRM).
Ichnographic representing, in general, is to show dimensions and reinforcement details of structural members directly in the structural plan layout according to rules of IRM. A completed set of structural construction drawings shall include both IRM drawings and standard detailing drawings.
3. Main design references in this drawing collection are:
Seismic Ground Motion Parameters Zonation Map of China (GB 18306-2015)
Code for Design of Concrete Structures (2015 version) (GB 50010-2010)
Code for Seismic Design of Buildings (GB 50011-2010) and its partial revision in 2016
Code for Design of Building Foundation (GB 50007-2011)
Technical Specification for Concrete Structures of Tall Buildings (JGJ3-2010)
Technical Code for Building Pile Foundations (JGJ 94-2008)
Technical Code for Waterproofing of Underground Works (GB 50108-2008)
Standard for Structural Drawings (GB/T 50105-2010)
If the reference standards are revised or new standards are implemented and the contents or products in this drawing collection are conflicted with them, such contents or products shown in this drawing collection shall be invalid. Engineers who use this drawing collection shall check relevant contents in this drawing collection with updated standards.
4. There are two parts in this drawing collection: drawing rules of IRM, and standard detailing drawings of commonly used spread footings, strip foundations, raft foundations (ribbed and slab) and pile foundations made of cast-in-situ concrete.
5. This drawing collection is applicable to the construction drawing design of all kinds of cast-in-situ concrete spread footings, strip foundations, raft foundations (ribbed and slab) and pile foundations.
6. The rules specified in this drawing collection can be used for designers to generate ichnographic construction drawings or can be used as reference for contractors and inspectors to understand and use ichnographic construction drawings correctly.
7. Details and other items which are not included in this drawing collection should be worked out by designers.
8. If modifications of the standard detailing drawings in this drawing collection are required for certain projects, designers should provide specific modified contents.
9. Bars are shown as red lines in some parts of the standard detailing drawings of this drawing collection.
10. In this drawing collection, ‘Φ’ is the diameter of steel bars, instead but not the steel grade.
11. All dimensions are in millimeters (mm), and structural levels are in meters (m).
12. Are there any questions and comments when using this drawing collection, please visit webpage http://www.chinabuilding.com.cn, and contact us via G101.
rawing Rules of Ichnographic Representing Method
1 General Provisions
1.1.1 Setting the rules of IRM is to standardize the use of IRM in structural construction drawings of buildings, to uniform the format of construction drawings carried out by IRM, and to ensure the quality of design and construction.
1.1.2 The rules in this drawing collection are applicable to the structural construction drawing design of all types of cast-in-situ concrete foundations, e.g. spread footings, strip foundations, raft foundations and pile foundations-
1.1.3 Apart from the rules of IRM in this drawing collection, other updated national standards shall also be complied with.
1.1.4 Construction drawings carried out in accordance with IRM usually consist of two main parts: ichnographic construction drawings and standard detailing drawings. However, for complicated industrial and civil buildings, other detail information, such as plan layout and details of formworks, openings and embedded parts, is also required.
1.1.5 When structural construction drawings are carried out using IRM, according to the design of specific projects, dimensions and reinforcement details of structural members shown in the plan layout shall comply with the relevant rules of IRM. When construction drawings are prepared, the full set of construction drawings should be arranged in the order of foundations, columns, shear walls, beams, slabs, stairs and other members.
1.1.6 For construction drawings of cast-in-situ concrete spread footings, strip foundations, raft foundations and pile foundations which are carried out in accordance with IRM, dimensions and reinforcement details of foundations shall be mainly described by ichnographic annotation, and sectional annotation is a supplementary
method for better description.
1.1.7 When ichnographic construction drawings are prepared, every structural member should be numbered, which includes the type code and serial number of the member. The type code is to indicate relevant standard detailing drawings. Standard detailing drawings are noted with the type code of members to show the complementary relationship between the detailing drawings and corresponding types of members in ichnographic construction drawings. A completed set of structural design drawings shall include both ichnographic construction drawings and standard detailing drawings.
1.1.8 For ichnographic construction drawings of foundation, the reference elevation of the base of foundation and absolute elevation
±0.000 should be noted in tables or by other methods.
This drawing collection should be used in conjunction with drawing collections of national building standard design 16G101-1 and 16G101-2. Structural floor level shall be coordinated with structural story height in the same project in order to set the vertical position of foundations, columns, walls, beams, slabs, stairs, etc.
Notes:
1. Structural floor level is the floor level shown in architectural drawings excluding the thickness of floor finishing and cushion layers. The floor number in structural drawings shall be consistent with that in architectural drawings.
2. For a given project, if there is only one foundation level, the reference elevation of the base of foundation is the elevation of foundation. If there are different base elevations of foundation, the reference elevation should be the elevation of majority ones, elevations and regions of foundations with different elevations should be noted in drawings.
Part One
Drawing Rules of Ichnographic Representing Method
1 General Provisions
2 Rules of Ichnographic Construction Drawings of Spread Footings
2.1 Representing method of ichnographic construction drawings of spread footings
2.2 Numbering of spread footings
2.3 Ichnographic annotation method of spread footings Example of construction drawings of spread footings using IRM
2.4 Sectional annotation method of spread footings
2.5 Others
3 Rules of Ichnographic Construction Drawings of Strip Foundations
3.1 Representing method of ichnographic construction drawings of strip foundations
3.2 Numbering of strip foundations
3.3 Ichnographic annotation method of foundation beams
3.4 Rules of the length of discontinuous longitudinal bars at the bottom of foundation beams
3.5 Ichnographic annotation method of strip foundation slabs Example of construction drawings of strip foundations using IRM
3.6 Sectional annotation method of strip foundations
3.7 Others
4 Rules of Ichnographic Construction Drawings of Ribbed Raft Foundations
4.1 Representing method of ichnographic construction drawings of ribbed raft foundations
4.2 Type and numbering of members of ribbed raft foundations
4.3 Ichnographic annotation method of primary & secondary foundation beams
4.4 Rules of the length of discontinuous longitudinal bars at the bottom of foundation beams
4.5 Ichnographic annotation method of slabs of ribbed raft foundations
4.6 Others
Annotation of primary foundation beams (JL) and secondary foundation beams (JCL)
Annotation of the slab (LPB) of ribbed raft foundations
5 Rules of Ichnographic Construction Drawings of Slab Foundations
5.1 Representing method of ichnographic construction drawings of slab foundations
5.2 Type and numbering of members in slab foundations
5.3 Ichnographic annotation method of slab strips under columns and slab strips at midspan
5.4 Ichnographic annotation method of the slab (BPB) of slab foundations
5.5 Others
Annotation of slab strips under columns (ZXB) and slab strips at midspan (KZB)
Annotation of the slab (BPB) of slab foundations
6 Rules of Ichnographic Construction Drawings of Pile Foundations
6.1 Representing method of ichnographic construction drawings of cast-in-place piles
6.2 Tabulated annotation method
6.3 Ichnographic annotation method
6.4 Representing method of ichnographic construction drawings of pile caps
6.5 Numbering of pile caps
6.6 Ichnographic annotation method of independent pile caps
6.7 Ichnographic annotation method of pile cap beams
6.8 Sectional annotation method of pile caps
6.9 Others
7 Drawing Rules of Detailing Related to Foundations
7.1 Type and representing method of related detailing
7.2 Drawing rules of ichnographic construction drawings of related detailing
7.3 Others
Part Two Standard Detailing Drawings
Environment classification of concrete structures Minimum concrete cover
Basic anchorage length lab of tension bars
Basic anchorage length labE of tension bars in seismic design and the inside diameter of hook D
Anchorage length la of tension bars
Anchorage length laE of tension bars in seismic design Hooks and mechanical anchorage types of longitudinal bars
Stirrup detailing in the lap zone of longitudinal main bars Splices of longitudinal bars
Lap length ll of longitudinal tension bars
Lap length llE of longitudinal tension bars in seismic design Detailing of hooks of closed stirrups and tie bars
Overlapping stirrups in the foundation beam
Lapping detailing of non-contact longitudinal bars
Detailing of vertical distribution bars in walls anchored in foundations Detailing of developing longitudinal bars in boundary elements to foundations
Detailing of developing longitudinal bars in columns to foundations Reinforcement detailing of spread footing slabs (DJJ, DJP, BJJ and BJP)
Top and bottom reinforcement detailing of double-column normal spread footings
Reinforcement detailing of double-column normal spread footings
with foundation beams
Detailing of reducing length of bars by 10% in spread footings Detailing of single-socket and double-socket spread footings
Reinforcement detailing of high-socket spread footings
