This specification is formulated to promote the development of concrete pumping technology and improve the quality of concrete pumping construction. This specification is applicable to ordinary concrete pumping construction in industrial and civil construction projects and other similar projects. Cui Chaodong JGJ/T 10-1995 Technical Specification for Concrete Pumping Construction JGJ/T10-1995 Standard download decompression password: www.bzxz.net

Technical specification for pumping construction of concreteJGJ/T10—95Beijing, 1995Industry standard of the People's Republic of ChinaTechnical specification for pumping construction of concrete concrete
JGJ/T10—95
Editor: China Academy of Building ResearchApproval: Ministry of Construction of the People's Republic of ChinaEffective date: October 1, 1995
China Building Industry Press
Beijing, 1995
Industry standard of the People's Republic of China
Technical specification for concrete pumping construction
JGJ/T10—95
Published and distributed by China Building Industry Press (Baiwanzhuang, western suburbs of Beijing)Distributed by Xinhua Bookstore
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Notice on Issuing the Industry Standard "Technical Code for Concrete Pumping Construction"
Construction Standard [1995] No. 96
To the Construction Committees (Construction Departments) of provinces, autonomous regions, and municipalities directly under the Central Government, the Construction Committees of cities with independent planning status, and relevant departments of the State Council:
In accordance with the requirements of the Ministry of Construction's (90) Jianbiao No. 407 document, the "Technical Code for Concrete Pumping Construction" edited by the China Academy of Building Research has been reviewed and is now approved as a recommended industry standard, numbered JGJ/T10-95, and will be implemented on October 1, 1995.
This standard is managed and interpreted by the China Academy of Building Research, the technical unit responsible for building engineering standards under the Ministry of Construction.
This standard is published by the Standard Estimation and Rating Research Institute of the Ministry of Construction. Ministry of Construction of the People's Republic of China
February 27, 1995
Main symbols
3 Source materials and mix proportions of pumped concrete
3.1 Raw materials of pumped concrete
3.2 Mix proportions of pumped concrete
4 Supply of pumped concrete
4.1 General provisions
4.2 Mixing of pumped concrete
4.3 Transportation of pumped concrete
5 Selection and arrangement of concrete pumping equipment and pipelines 5.1 Selection and arrangement of concrete pumps
5.2 Piping design
5.3 Requirements for configuration of material distribution equipment
6 Pumping and pouring of concrete
6.1 General provisions
6. 2 Pumping of concrete
6.3 Casting of pumped concrete
7 Quality control of pumped concrete·
Appendix A Optimal grading diagram of coarse and fine aggregates
Appendix B Calculation formula for maximum horizontal conveying distance of concrete pumps Appendix
Calculation formula for maximum side pressure of formwork
Appendix D
Relationship between specifications and diameters of common concrete conveying pipes and maximum particle size of coarse aggregates
Pressure seepage test of pumped concrete
Appendix E
Appendix F Explanation of terms used in this code
Additional explanation
Explanation of clauses
1 General
1.0.1 This code is formulated to promote the development of concrete pumping technology and improve the quality of concrete pumping construction.
1.0.2 This code applies to ordinary concrete pumping construction in industrial and civil construction projects and other similar projects.
1.0.3 Concrete pumping construction should have a strict construction organization design, and should not be carried out until the previous process has been accepted. 1.0.4 During concrete pumping construction, in addition to complying with the provisions of this code, it should also comply with the provisions of the relevant national standards in force. Safety technology, labor protection, fire prevention and other requirements during concrete pumping construction must comply with relevant regulations.
2 Main symbols
N,—Number of concrete mixer trucks;
Q1—Actual average output of each concrete pump; V,--Capacity S of each concrete mixer truck. Average speed of concrete mixer truck; L-round trip distance of concrete mixer truck; T, total rest time of each concrete mixer truck; Qmax-maximum output of each concrete pump; α-piping condition coefficient;
7-operation efficiency;
R---radius of curvature
N2-number of concrete pumps;
Q-number of concrete pours;
concrete pumping construction operation time:
T. —-
The maximum horizontal conveying distance of the concrete pump; Lmax
Pmax -
The maximum outlet pressure of the concrete pump;
-The pressure loss generated by the concrete flowing in the horizontal conveying pipe per meter, APH-
The radius of the concrete conveying pipe,
Adhesion coefficient;
Velocity coefficient;
Concrete sag;
The ratio of the switching time of the concrete pump distribution valve to the time when the piston pushes the concrete;
V2—The average flow velocity of the concrete mixture in the conveying pipe; α2—The ratio of radial pressure to axial pressure; F—~The maximum lateral pressure of the newly poured concrete on the formwork;-—Concrete gravity density;
t. Initial setting time of fresh concrete;
T——concrete temperature;
V——concrete pouring speed;
H——total height from the concrete lateral pressure calculation position to the top surface of fresh concrete;
β, admixture influence correction factor;
β2—concrete slump correction factor;
S1o——relative water bleeding rate of concrete when pressurized to 10s;V10, V140——water bleeding rate of concrete when pressurized to 10s and 140s. 3
3 Raw materials and mix proportions of pumped concrete
3.1 Raw materials of pumped concrete
3.1.1 The cement used for mixing pumped concrete shall comply with the following current national standards (1) "Portland cement, ordinary Portland cement"; (2) "Slag Portland cement, pozzolana Portland cement, fly ash Portland cement".
3.1.2 Ratio of the maximum particle size of coarse aggregate to the diameter of the conveying pipe: when the pumping height is below 50m, it should not be greater than 1:3 for crushed stone and 1:2.5 for pebbles; when the pumping height is 50~100m, it should be 13~1:4; when the pumping height is above 100m, it should be 1:4~1:5.
Coarse aggregate should comply with the provisions of the current national standard "Quality Standard and Test Method for Crushed Stone or Pebbles for Ordinary Concrete". Coarse aggregate should be graded continuously, and the content of needle-like particles should not be greater than 10%.
The best gradation of coarse aggregate can be selected according to Figures A-1 to A-4 in Appendix A. 3.1.3 Fine aggregate should comply with the provisions of the current national standard "Quality Standard and Test Method for Sand for Ordinary Concrete". Fine aggregate should be medium sand, and the sand passing through the 0.315mm sieve should not be less than 15%.
The best gradation of fine aggregate can be selected according to Figure A-5 in Appendix A. 3.1.4 The water used for mixing pumped concrete shall comply with the provisions of the current national standard "Standard for Water for Concrete Mixing".
3.1.5 The admixtures used in pumped concrete shall comply with the relevant provisions of the current national standards "Concrete Admixtures", "Technical Specifications for the Application of Concrete Admixtures", "Concrete Pumping Agents" and "Ready-mixed Concrete".
3.1.6 Pumped concrete should be mixed with an appropriate amount of fly ash and shall comply with the relevant provisions of the current national standards 4
"Fly Ash Used in Cement and Concrete", "Technical Specifications for the Application of Fly Ash in Concrete and Mortar" and "Ready-mixed Concrete". 3.2 Mix Ratio of Pumped Concrete
3.2.1 The mix ratio of pumped concrete must not only meet the requirements of concrete design strength and durability, but also ensure that the concrete meets the requirements of pumpability. 3.2.2 The design of the mix ratio of pumped concrete shall comply with the relevant provisions of the current national standards "Ordinary Concrete Mix Design Code", "Concrete Structure Engineering Construction and Acceptance Code", "Concrete Strength Test and Evaluation Standard" and "Ready-mixed Concrete". And it should be trial-mixed according to specific construction conditions such as concrete raw materials, concrete transportation distance, concrete pump and concrete delivery pipe diameter, pumping distance, air temperature, etc. If necessary, the mix ratio of pumped concrete should be determined by trial pumping.
3.2.3 The pumpability of concrete can be controlled by pressure bleeding test combined with construction experience. Generally, the relative pressure bleeding rate S1. at 10s should not exceed 40%. 3.2.4 The slump of pumped concrete can be selected according to the provisions of the current national standard "Concrete Structure Engineering Construction and Acceptance Code". For different pumping heights, the slump of concrete when entering the pump can be selected according to Table 3.2.4-1. The slump loss value of concrete over time can be determined according to Table 3.2.4-2.
Selected concrete slump values ​​at different pumping heights Pumping height (m)
Slump (mm)
Below 30
100~140
140~160
60~100
160~180
Concrete slump loss over time
Atmospheric overflow ()
Concrete slump loss over time (mixed with fly ash and wood calcium, over 1h)
20~30
25~35
Table 3. 2. 4-1
Above 100
180~200
Table 3. 2.4-2
30～35bzxZ.net
35～50
Note: When fly ash and other admixtures are added, the slump loss over time can be determined based on construction experience. If there is no construction experience, it should be determined through experiments.
3.2.5 The water-cement ratio of pumped concrete should be 0.4~0.6. 3.2.6 The sand ratio of pumped concrete should be 38%~45%. 5
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