Construction method of bridge pile foundation in mountainous area

A construction method and technology of pile foundation, applied in the direction of foundation structure engineering, construction, etc., to achieve the effect of improving the interface structure, enhancing the bearing capacity and high strength

Active Publication Date: 2016-04-20
NANYANG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention uses debris to replace most of the sand and some stones, and fully exerts the effect of CTF concrete synergist to improve the dispersion of cement particles and improve the effect of water reducing agent; but the compressive strength, durability and impact resistance of the concrete Still need to strengthen

Method used

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  • Construction method of bridge pile foundation in mountainous area
  • Construction method of bridge pile foundation in mountainous area

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A construction method for bridge pile foundations in mountainous areas, combining figure 1 shown, including the following steps:

[0034] (1) Measurement and stakeout: Level the construction site, accurately locate the position of the pile foundation, and set up protective piles;

[0035] (2) Hole digging: In the process of digging the pile hole 2, in order to prevent the hole from collapsing, cast-in-place concrete retaining walls are used, one meter at a time, and the retaining wall concrete is C25 concrete, and a vibrating rod is used for tamping when pouring concrete , so that the concrete is dense and in close contact with the surrounding rock mass, the lower concrete should wrap the upper concrete retaining wall by 10cm to avoid water seepage; after the pile hole is completed, ream the hole to form the reaming cavity 5 above the rock mass 8 at the bottom of the pile hole;

[0036] (3) Place reinforcement cages and enlarged reinforcement cages: After hoisting the ...

Embodiment 2

[0048] Embodiment 2 is the same as the construction method of the mountain bridge pile foundation of embodiment 1, and the difference is:

[0049] Concrete includes the following raw materials in parts by weight: 282 parts of P.O42.5 Portland cement, 61 parts of coal ash powder, 28 parts of mineral powder, 18 parts of silica fume, 750 parts of fine aggregate, 1010 parts of coarse aggregate, water 170 parts, 6 parts of polycarboxylate superplasticizer, 7 parts of composite reinforcing fiber, 35 parts of polyvinyl acetate emulsion, 7 parts of dispersant sodium methylcellulose, 0.45 parts of silicone oil.

[0050] Among them, the fine aggregate is medium sand, the fineness modulus is 3.0, and the mud content is 1% to 1.5%.

[0051] Among them, the coarse aggregate is stone, with a mud content of ≤2% and a particle size of ≤35mm.

[0052] Wherein the preparation method of composite reinforcing fiber comprises:

[0053] Soak polypropylene fiber powder in NaOH solution with a volu...

Embodiment 3

[0058] Embodiment 3 is identical with the construction method of the bridge pile foundation in mountainous area of ​​embodiment 1, and difference is:

[0059] Concrete includes the following raw materials in parts by weight: 285 parts of P.O42.5 Portland cement, 62 parts of coal ash powder, 26 parts of mineral powder, 16 parts of silica fume, 780 parts of fine aggregate, 1020 parts of coarse aggregate, water 160 parts, 7 parts of polycarboxylate superplasticizer, 8 parts of composite reinforcing fiber, 40 parts of polyvinyl acetate emulsion, 4 parts of dispersant methyl cellulose and sodium methyl cellulose, 0.5 part of silicone oil.

[0060] Among them, the fine aggregate is medium sand, the fineness modulus is 3.0, and the mud content is 1% to 1.5%.

[0061] Among them, the coarse aggregate is stone, with a mud content of ≤2% and a particle size of ≤35mm.

[0062] Wherein the preparation method of composite reinforcing fiber comprises:

[0063] Soak the polypropylene fiber...

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Abstract

The invention discloses a construction method of a bridge pile foundation in a mountainous area. The construction method comprises the following steps: (1) staking out in survey, namely locating position of the pile foundation; (2) digging a hole, namely enlarging hole on the bottom rock of a pile hole after digging the pile hole to form an enlarge hole cavity; (3) placing a steel reinforcement cage and an enlarged steel reinforcement cage, namely placing a main steel reinforcement cage in the pile hole and placing the enlarged steel reinforcement cage in the enlarged hole cavity; (4) pouring concrete, namely pouring concrete into the pile hole by adopting a guide pipe method and manufacturing a bearing platform; and (5) arranging anchor cables, namely drilling around the pile foundation, mounting a vertical anchor cable and a horizontal anchor cable, grouting by adopting a hole bottom grout returning method, and punching the vertical anchor cable and the horizontal anchor cable into the rock by passing through the soil layer. The construction method is simple; the pile foundation bearing capability is strong.

Description

technical field [0001] The invention relates to the field of construction engineering, in particular to a construction method for bridge pile foundations in mountainous areas. Background technique [0002] The terrain in mountainous and steep slope areas is complex, the ground is rough and undulating, and most of them are mountains, hills and rugged plateaus, and the transportation is inconvenient. Using mechanical drilling, it is difficult to transport and install mechanical equipment on steep slopes, and the work site is narrow; the drilling mud and waste residue cannot be discharged, and a large amount of mud is not good for the protection of the ecological environment, and the construction is difficult; The retaining wall is relatively difficult, and the mountain body is prone to collapse under the action of impact, which poses a great safety hazard; when the mechanical drilling process encounters inclined rock surfaces such as probe stones, stone buds, and karst trenche...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D27/12
CPCE02D27/12
Inventor 张树珺谢玉辉邵海涛陈珂徐留中任凌辉石磊张滨张沛
Owner NANYANG INST OF TECH
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