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Secant pile of sand-gravel red sandstone composite stratum and construction method of secant pile

A technology of composite strata and construction method, applied in excavation, sheet pile wall, foundation structure engineering and other directions, can solve the problems of good water-stop effect, high construction cost, poor pile forming effect in red sandstone stratum, etc. Simple, improved enclosure strength, and fast hole formation

Inactive Publication Date: 2018-03-27
CHINA RAILWAY 21ST BUREAU GRP TRACK TRAFFIC ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The construction technology of occlusal piles in sand-pebble-red-sandstone composite stratum is different from other strata. The existing technology has the following problems in the construction of subway station foundation pits in sand-pebble-red sandstone composite stratum in Northwest China: 1. The underground diaphragm wall can meet the water stop Requirements but high construction costs; 2. The construction cost of "pin"-shaped piles is low but the water-stopping effect is not good; 3. The effect of rotary jetting piles in red sandstone formations is not good, and the water-stopping effect cannot be guaranteed
Traditional construction methods cannot meet the construction technical requirements of low construction cost and good water-stop effect

Method used

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  • Secant pile of sand-gravel red sandstone composite stratum and construction method of secant pile

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A construction method of an occlusal pile in a sandy pebble-red sandstone composite stratum, comprising the steps of:

[0035] A. Construction of occlusal piles

[0036] The pile diameter 800mm of described occlusal pile and enclosure pile, adopts full rotary drilling construction to offer occlusal pile hole, pours concrete in pile hole and makes occlusal pile;

[0037] B. Construction of retaining pile holes

[0038] Full rotary drilling is used to create surrounding pile holes on both sides of the occlusal pile, and the full rotary drilling drill cuts the side of the occlusal pile to form an occlusal intersecting gap; the occlusal pile is dried until the concrete strength reaches 50% and the hole is drilled. The thickness A of the occlusal intersecting gap 150mm;

[0039] C. Construction of retaining piles

[0040] The surrounding protection piles are built with steel bars in the holes of the surrounding protection piles and the intersecting gaps.

Embodiment 2

[0042] A construction method of an occlusal pile in a sandy pebble-red sandstone composite stratum, comprising the steps of:

[0043] A. Construction of occlusal piles

[0044] The occlusal pile pile diameter is 800mm, and the pile diameter of the surrounding protection pile is 900mm. The enclosing pile adopts full rotary drilling construction to set up the occlusal pile hole, and pouring concrete in the pile hole makes the occlusal pile;

[0045] B. Construction of retaining pile holes

[0046] Full rotary drilling is used to create surrounding pile holes on both sides of the occlusal pile, and the full rotary drilling drill cuts the side of the occlusal pile to form an occlusal intersecting gap; the occlusal pile is dried until the concrete strength reaches 50% and the hole is drilled. The thickness A of the occlusal intersecting gap 200mm; the verticality between the occlusal pile hole and the retaining pile hole is above 3‰;

[0047] C. Construction of retaining piles

...

Embodiment 3

[0050] A construction method of an occlusal pile in a sandy pebble-red sandstone composite stratum, comprising the steps of:

[0051] A. Construction of occlusal piles

[0052] The occlusal pile pile diameter is 800mm, and the pile diameter of the surrounding protection pile is 900mm. The enclosing pile adopts full rotary drilling construction to set up the occlusal pile hole, and pouring concrete in the pile hole makes the occlusal pile;

[0053] B. Construction of retaining pile holes

[0054] Use full rotary drilling to set up surrounding protection pile holes on both sides of the occlusal pile, and the full rotary drilling drill cuts the side of the occlusal pile to form an occlusal intersecting gap; the thickness A of the occlusal intersecting gap is 200mm; the occlusal pile hole and the surrounding protection pile hole The verticality is above 3‰;

[0055] C. Construction of retaining piles

[0056] The surrounding protection piles are built with steel bars in the hol...

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Abstract

The invention relates to the technical field of civil construction, in particular to a secant pile of a sand-gravel red sandstone composite stratum and a construction method of the secant pile. The problem of balance between the construction cost and the water stop effect during construction of a deep foundation pit enclosure structure of the sand-gravel red sandstone composite stratum currently is mainly solved. In a traditional method, delta-shaped piles and jet grouting piles are low in construction cost but poor in water stop effect, and underground diaphragm walls or traditional secant piles can guarantee the water stop effect but are high in construction cost. According to construction of the secant pile, coagulation hard occlusion is conducted by directly adopting a rotary digging drill to form a secant pile water stop curtain, and the construction cost is far lower than that of a traditional full casing secant pile technology; compared with the traditional construction technology, the construction progress is quick, the number of construction associated equipment is small, construction investment is small, and under the same condition, the steel bar pile hole-forming time of the secant pile is only 40% of that of the traditional full casing construction technology; and through verification of the scheme, the water stop effect of the secant pile can reach 95% or over that of the underground diaphragm walls or the traditional secant piles.

Description

technical field [0001] The invention relates to the technical field of civil construction, in particular to an occlusal pile for a sandy pebble-red sandstone composite stratum and a construction method thereof. Background technique [0002] As a mature technology, the construction technology of occlusal piles requires the use of ultra-retarded concrete and full-casing drilling rigs, and the construction cost is particularly high. The cost is almost twice that of the underground diaphragm wall of the same thickness, and the hole forming speed is slow, which is lower than that of ordinary drilling. Twice as long as the hole-forming time of cast-in-situ piles. The construction technology of occlusal piles in the sand-pebble red-sandstone composite stratum is different from other strata. The existing technology has the following problems in the construction of the subway station foundation pit in the sand-pebble-red sandstone composite stratum in Northwest China: 1. The undergro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/34E02D5/18E02D17/04
CPCE02D5/34E02D5/18E02D17/04
Inventor 康逢学薄志军李鹏辉郭健高升孟庆斌常汉明景文琪
Owner CHINA RAILWAY 21ST BUREAU GRP TRACK TRAFFIC ENG
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