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High-strength prestressed concrete pipe pile with section and its production method

A concrete and prestressed technology, applied in sheet pile wall, construction, foundation structure engineering, etc., can solve problems such as joint cracking, and achieve the effect of improving interface strength, improving strength, and easy formwork removal.

Active Publication Date: 2011-05-04
上海陆丽科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The strength of the joint pipe pile above 80MPa can be obtained by normal pressure steam curing first, but in the autoclave curing stage, due to the temperature change of the pipe pile body, the joints will crack due to temperature difference

Method used

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  • High-strength prestressed concrete pipe pile with section and its production method
  • High-strength prestressed concrete pipe pile with section and its production method
  • High-strength prestressed concrete pipe pile with section and its production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Manufacture of high-strength prestressed concrete pipe pile with joints of the present invention

[0060] raw material

[0061] a) Cement: Portland cement, ordinary Portland cement, and slag Portland cement with a strength grade of not less than 42.5 are preferred. The stability of the cement must be qualified and compatible with the water reducing agent used, and the strength of the cement mortar must meet the requirements and have a certain surplus.

[0062] b) Aggregate (sand, stone): aggregate accounts for about 70% of the concrete volume in concrete. It acts as a skeleton in concrete, giving concrete greater volumetric stability and better durability than grout alone. The high content of stone powder and mud in the aggregate will directly affect the workability of the concrete mixture and adversely affect the centrifugal effect.

[0063] Sand: use clean natural medium sand with a fineness modulus of 2.3-3.4, preferably graded in zone II, with a mud content of ≤3...

Embodiment 2

[0085] On the basis of Example 1, autoclave curing is added.

[0086] As the manufacturing method of the present invention, it can be cured by autoclaving after normal pressure curing.

[0087] The autoclaving curing means that after the pipe pile is demoulded, it is put into an autoclave for autoclaving curing. Autoclaved curing can give full play to the secondary reaction of cement, and can significantly improve the strength of concrete under the same amount of cement.

[0088] The autoclaved curing conditions are carried out at 165-185° C. and 10-13 atmospheric pressure. Preferably, it is carried out at 180°C and 12 atmospheres.

[0089] Autoclave curing is an important means for pipe pile concrete to obtain high strength, and it is the only way to produce PHC piles. In the high-pressure and high-temperature saturated steam, the role of water becomes very active, and the hydrothermal effect further promotes the hydration reaction of cement and the reorganization and matu...

Embodiment 3

[0096] In addition to the average particle size of silica fume at 0.25 microns, the interval between the pipe piles is 8-12m to form nodes, the circumference of the nodes is 157mm, the outer diameter of the nodes is 500mm, the outer diameter of the pile shaft is 400mm, and the cross-sectional area is 684cm 2 , wall thickness 65mm, PC steel rods embedded in the concrete sectioned pipe pile, the nominal diameter of which is 9.2mm, 8 rods are set, and the cross-sectional area of ​​each rod is 5.12cm 2 Except, others are the same as embodiment 1.

[0097] In addition, taper parts 4a, 4b are formed on the upper and lower sides of each node, and each part is integrally poured with concrete. The central hole 6 is formed during centrifugal molding, and the upper end surface 5a and the lower end surface 5b are both planar.

[0098] Figure 4 shows an enlarged view of the node. Between the pile shaft part 2 and the node part 3, the upper and lower sides are connected by a cone. The an...

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Abstract

The invention provides a high-strength pre-stress concrete pipe pile with knurls. A plurality of ring-shaped convex knurl parts are formed on the pipe pile body with spacing; the pipe pile body between all knurl parts forms a pile shaft part; all parts are integrally poured by concrete; the concrete pipe pile body with the knurls is embedded by PC steel bars and rebar; the concrete pipe pile is characterized in that the concrete of the high-strength pre-stress concrete pipe pile with the knurls is added by 5-25% of silica ashes (powder-shaped SiO2) with the average particle size of 0.1-0.5 Microns. According to the high-strength pre-stress concrete pipe pile with knurls, the silica ash is added in the raw material, thus preventing the cracking of knurl part and the like during the normal-pressure steam curing or the stage thereafter. Meanwhile, the knurl structure of the concrete pipe pile with the knurls can be changed, thus being beneficial for improving the strength. Furthermore, aconical part is used for connecting the difference between high position and low position between the pile shaft part and the knurl part, thus becoming easy for the mould removal operation of the pile fabrication process. Furthermore, as the knurl parts have an effect of increasing the strength, the high-strength pre-stress concrete pipe pile with knurls is beneficial to the transport and construction of the pipe piles.

Description

technical field [0001] The present invention relates to a pile for building foundation and its preparation method, in particular, the present invention relates to a high-strength prestressed concrete pipe pile with joints and its preparation method, and the concrete pipe pile with joints has better support than straight piles force. Background technique [0002] Prefabricated concrete pipe piles include prestressed concrete pipe piles (codenamed PC pipe piles), prestressed high-strength concrete pipe piles (codenamed PHC or PRC pipe piles) and pretensioned thin-walled prestressed concrete pipe piles (codenamed PTC pipe piles). Prestressed concrete pipe piles have the advantages of fast construction speed, easy quality assurance, high pile body strength (C60-C80), strong pile sinking capacity, high single pile bearing capacity, short construction period, and low cost. As a new type of engineering foundation pile, prestressed concrete pipe pile has been widely used in high-ri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D5/58
Inventor 会泽祥弘
Owner 上海陆丽科技有限公司
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