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Concrete for pipeline balance

A concrete and pipeline technology, applied in the field of pipeline counterweight, can solve problems such as unsatisfactory, high water ash, unsuitable for pipeline counterweight coating, etc., achieve the effect of maintaining stability, broad application prospects, and reducing material costs

Inactive Publication Date: 2007-11-07
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Ordinary concrete commonly used in construction at present has a wide range of uses, but the following disadvantages determine that it is not suitable for pipe counterweight coating:
[0004] (1) Ordinary concrete usually uses sand and stone aggregates, and its density generally does not exceed 2400Kg / m 3 , unable to meet the requirements of the pipeline counterweight layer for the concrete density of 2850Kg / m 3 above requirements;
[0005] (2) In order to obtain better building construction performance and compactness, ordinary concrete generally has a relatively high water-cement ratio and cannot be used for pipeline counterweight coating;

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. The concrete components for pipeline counterweight are as follows:

[0022] Heavy aggregate:sand:ordinary Portland cement:water is mixed in a weight ratio of 56.5:12.5:25:6.

[0023] mesh size

9.50mm

4.75mm

2.36mm

1.18mm

600μm

300μm

150μm

Passing rate(%)

100

87.98

57.42

45.61

29.96

18.24

13.65

[0024] mesh size

4.75mm

2.36mm

1.18mm

600μm

300μm

150μm

Sieve residue (%)

2.97

9.11

15.26

40.87

88.28

99.70

[0025] The cement is ordinary Portland cement P·O 42.5, the tricalcium aluminate content is 6.3%, and the alkali content is 0.46%;

[0026] 2. After the components are combined, concrete is formed by mechanical stirring. The measured water-cement ratio is 0.24, and the concrete density of the counterweight coating specimen is 2860Kg / m 3 ;

Embodiment 2

[0028] 1. The concrete components for pipeline counterweight are as follows:

[0029] Heavy aggregate: sand: ordinary Portland cement: water is formulated in a weight percentage of 66.5:5.34:22:6.16.

[0030] mesh size

9.50mm

4.75mm

2.36mm

1.18mm

600μm

300μm

150μm

Passing rate(%)

100

91.14

57.60

45.13

30.48

19.82

14.98

[0031] mesh size

4.75mm

2.36mm

1.18mm

600μm

300μm

150μm

Sieve residue (%)

3.21

9.56

16.80

41.82

88.17

97.41

[0032] The cement is Portland cement P·II42.5R, the tricalcium aluminate content is 6.8%, and the alkali content is 0.53%;

[0033] 2. After the components are combined, concrete is formed by mechanical stirring. The measured water-cement ratio is 0.28, and the concrete density of the counterweight coating specimen is 3065Kg / m 3 ;

Embodiment 3

[0035] 1. The concrete components for pipeline counterweight are as follows:

[0036] Heavy aggregate: sand: ordinary Portland cement: water is mixed in a weight percentage of 76:2.88:16:5.12.

[0037] mesh size

9.50mm

4.75mm

2.36mm

1.18mm

600μm

300μm

150μm

Passing rate(%)

100

90.63

54.84

43.81

29.65

19.67

14.46

[0038] mesh size

4.75mm

2.36mm

1.18mm

600μm

300μm

150μm

Sieve residue (%)

2.97

9.11

15.26

40.87

88.28

99.70

[0039] The cement is Portland cement P·I52.5R, the tricalcium aluminate content is 6.4%, and the alkali content is 0.48%.

[0040] 2. After the components are combined, concrete is formed by mechanical stirring. The measured water-cement ratio is 0.32, and the concrete density of the counterweight coating specimen is 3230Kg / m 3 ;

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Abstract

The present invention relates to concrete for pipeline balance, and is especially one kind of dry concrete with density over 2,850 Kg / cu m for coating pipeline. The concrete for coating pipeline has the materials comprising heavy aggregate 56-78 wt%, sand 2-14 wt%, cement 16-25 wt% and water 3.5-8 wt%. It is coated to the outer surface of pipeline through spraying and extruding to form weight balancing concrete coating for maintaining the stability of pipeline in water. The present invention has wide application range.

Description

technical field [0001] The invention relates to the technical field of pipeline counterweights. Especially a density of 2850Kg / m 3 Above dry hard heavy concrete. Background technique [0002] For oil and gas transmission pipelines laid in seabeds, rivers, lakes, beach seas and swamps at a certain depth, in order to eliminate the buoyancy of water on the pipeline and maintain the stability of the pipeline after laying, it is generally necessary to spray or squeeze the outer wall of the pipeline. Coat a certain thickness of concrete counterweight layer, and the counterweight layer is usually designed with a density greater than 2850Kg / m 3 Concrete, the most is the density of 3040Kg / m 3 Left and right concrete, the coating process requires the concrete to have dry and hard working performance; [0003] Ordinary concrete commonly used in construction at present has a wide range of uses, but the following disadvantages determine that it is not ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B14/06C04B14/36C04B24/20C04B24/22C04B103/30
CPCC04B2201/20C04B28/04C04B2111/0031C04B2111/00215
Inventor 吴文通张晓灵顾艳胡峰
Owner CHINA NAT OFFSHORE OIL CORP
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