JG 225-2007Corrugated metal dusts for prestressee concrete (English PDF)

Foreword

1 modified material requirements;

2 corrugated metal ducts are divided into standard type and enhanced type

according to rigidity; standard type and enhanced type are basically

identical; enhanced type is the content added;

3 added a clause about marking of corrugated metal ducts;

4 added the minimum overlap width of the folded seam of corrugated metal

ducts;

5 modified dimensional and tolerance requirements for round ducts and flat

ducts;

6 added minimum ripple height requirements of corrugated metal ducts;

7 added radial rigidity requirements of enhanced-type corrugated metal ducts;

8 modified the concentrated load value and uniform load value of radial

rigidity test of flat ducts;

9 modified radial rigidity test method of corrugated metal ducts;

10 modified resistance to leakage of the length of the specimen and test

method of corrugated metal ducts;

11 deleted the anti-leakage performance test of specimen after bearing

uniform load;

12 modified quality assurance documentation requirements for exit-factory

products;

13 improved product transport and storage requirements; added stack height

limit of corrugated metal ducts;

14 added use requirements;

15 merged and adjusted of relevant provisions;

16 modified an annex. Annex A Quality inspection table of corrugated metal

ducts for prestressed concrete which is informative;

17 added an annex. Annex B Selection table of corrugated metal ducts for

prestressed concrete which is informative.

This Standard was proposed by Institute of Standard Quota of Ministry of

Construction of China.

This Standard shall be under the jurisdiction of China Building Research

Institute (the jurisdiction organization specially for standard in construction

engineering of Ministry of Construction).

Main drafting organization of this Standard. China Building Research Institute.

The drafting organizations of this Standard. Zhejiang Institute of Architectural

Science Design & Research Co., Ltd., Kaifeng Strong Anchoring Technology

Co., Ltd., Henan Hongqiao Prestressed Manufacturing Co., Ltd.

Main drafters of this Standard. Li Dongbin, Dai Weiming, Huo Tingbo, Li Guozhu,

Qiao Yongli.

This Standard was issued on October 1994 for the first time. This is the first

revision.

Corrugated metal ducts for prestressed concrete

1 Scope

This Standard specifies the classification and marking, requirements, test

methods, inspection rules, packaging, marks, transport, storage and use of

corrugated metal ducts for prestressed concrete.

This Standard is applicable to metal ducts of reserved hole which are made by

plated or non-plated low-carbon steel with a screw folded seam and used in

post-tensioned prestressed concrete structural pieces.

2 Normative references

The following standards contain the provisions which, through reference in this

Standard, constitute the provisions of this Standard. For dated references,

subsequent amendments (excluding corrections) or revisions do not apply to

this Standard. However, the parties who enter into agreement based on this

Standard are encouraged to investigate whether the latest versions of these

documents are applicable. For undated reference documents, the latest

versions apply to this Standard.

GB 716 Cold-rolled carbon structural steel strips

GB/T 2518 Continuously hot-dip zinc-coated steel sheet and strip

3 Classification and marking

4 Anti-leakage after concentrated load 3 5.4 4.6

5 Anti-leakage after bending 3 5.4 4.6

1 Appearance 6 Visual inspection 4.2

2 Size 6 5.2 4.1, 4.4

3 Radial rigidity under concentrated load

6 5.3 4.5

4 Radial rigidity under uniform load

6 5.3 4.5

5 Anti-leakage after concentrated load

6 5.4 4.6

9 Use