CN109339027A - A kind of high frequency drainage pile for liquefaction of sand - Google Patents

A kind of high frequency drainage pile for liquefaction of sand Download PDF

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Publication number
CN109339027A
CN109339027A CN201811452352.5A CN201811452352A CN109339027A CN 109339027 A CN109339027 A CN 109339027A CN 201811452352 A CN201811452352 A CN 201811452352A CN 109339027 A CN109339027 A CN 109339027A
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China
Prior art keywords
stake
pile
rhone
core
liquefaction
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CN201811452352.5A
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Chinese (zh)
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CN109339027B (en
Inventor
陈志雄
刘灿
蒋雪峰
张大伟
黄浩
阳洋
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Chongqing University
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Chongqing University
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/02Improving by compacting
    • E02D3/10Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22Piles
    • E02D5/24Prefabricated piles
    • E02D5/30Prefabricated piles made of concrete or reinforced concrete or made of steel and concrete

Abstract

The invention discloses a kind of high frequency drainage piles for liquefaction of sand, it from inside to outside successively include waterproof stake core, the water penetration pile shell with the stake core concentric shafts, it is trapezoidal waterproof stake top that the top of the stake core, which is fixedly connected with section, the bottom end of the stake core is fixedly connected with the waterproof pile top of taper, the pile top, stake top, stake core are prepared by bar frame and concrete, the stake top, pile top diameter be greater than stake core diameter, the stake shell is between the stake top and the pile top;The stake core offers the first rhone, the second rhone, drainage channel, first rhone is provided with its side surface along the length direction of stake core, second rhone is provided with its top surface along the length direction of stake core, and the drainage channel is for being connected to first rhone and second rhone;Stake top offers through-hole along its short transverse, and the through-hole and second rhone are tightly connected.Drainability of the present invention is good, and bearing capacity is high.

Description

A kind of high frequency drainage pile for liquefaction of sand
Technical field
The present invention relates to a kind of this drainage piles, are a kind of high frequency drainage piles for liquefaction of sand specifically.
Background technique
With the rapid development of the national economy, pile foundation is increasingly becoming a kind of most widely used base form.Pile foundation Because its speed of application is fast, the construction period is short, consolidation process depth is big, bearing capacity is big, stability is good, sedimentation value is small, to variously The significant advantage of matter condition and load situation are adaptable etc., it is increasingly extensive to be applied to skyscraper, heavy_weight factory, public affairs The numerous areas such as road, bridge, offshore engineering.With dressing basis widespread adoption, it is some there are the problem of also gradually expose Out.Further deepen and to what earthquake disaster essence recognized to the continuous tired of earthquake damage data recently as the mankind Product, find in the prevalence of such a phenomenon, i.e., the failure on the basis caused by the destruction of stake in liquefaction soil layers and on Portion's structural damage, and its bring consequence is quite serious even catastrophic.Therefore, liquefiable is located under geological process The research of pile foundation performance in soil layer has become a hot subject in current geotechnical earthquake engineering field.
According to the property of foundation soil body, the earthquake of pile foundation can be divided into the earthquake in liquefaction soil layers and non-liquefaction soil layers Two kinds of canonical forms of earthquake.Domestic and international seimic disaster census result shows the degree and its bring easy to damage of Mechanisms of Pile Foundations In Liquefaction Soils Extent of the destruction is considerably beyond the stake in non-liquefied foundation.
Li Yurun, Yuan Xiaomin summarize discovery by the earthquake damage of pile foundation to earthquake centre in multiple times, and liquefaction causes under brisance smaller Ground loses bearing capacity, and the soil body generates large deformation and sliding, is easy to destroy most of pile foundations, rather than pile foundation is broken under liquefied foundation It is bad to cause mainly due to strong earthquakes power, therefore pile foundation destruction is serious more than non-Liquefaction Ground under Liquefaction Ground.Summarize house, bridge It is found when with Pile Foundation of Wharf earthquake, pile foundation destruction occupies the overwhelming majority of destruction under weak Liquefaction Foundation, wherein liquefying soil Body laterally expands a kind of failure mode that the damage caused by pile foundation is considered to have generality.Liquefaction cause the soil body quickly into Enter non-linear working state, causes pile foundation that laterally big displacement occurs, when loss resulting from destroys caused by other reasons It is much bigger.
In seismic process, with the rising of pore water pressure, effective stress is reduced, and soil body modulus and intensity is caused to drop Low, the side resistance of liquefaction soil layers and lateral drag are reduced, and pile body is in liquefaction earth and superstructure system under certain condition It deforms under the collective effect of inertia force and even destroys.
Preventing the most effective approach of liquefaction of soil mass is draining, reduces the threat of pore water pressure, reduces liquefied risk. And most common method is setting drainage pile, drainage pile should have draining copper strips to resist foundation liquefaction, hold again to house Carry power.Existing drainage pile or resistance to compression bearing capacity be not high, resistance to plucking bearing capacity very little;Drainage performance is bad.
Summary of the invention
Object of the present invention is to be intended to provide it is a kind of for preventing the high frequency drainage pile of liquefaction of sand, drainability is good, Bearing capacity is high.
To realize the above-mentioned technical purpose, The technical solution adopted by the invention is as follows:
A kind of high frequency drainage pile for liquefaction of sand successively includes waterproof stake core, same with the stake core from inside to outside The water penetration pile shell of mandrel, it is trapezoidal waterproof stake top, the bottom end of the stake core that the top of the stake core, which is fixedly connected with section, It is fixedly connected with the waterproof pile top of taper, the pile top, stake top, stake core are prepared by bar frame and concrete, described Stake top, pile top diameter be greater than stake core diameter, the stake shell is between the stake top and the pile top;The stake core opens up There are the first rhone, the second rhone, drainage channel, first rhone is provided with its side table along the length direction of stake core Face, second rhone are provided with its top surface along the length direction of stake core, and the drainage channel is for being connected to described first Rhone and second rhone;The stake top offers through-hole, the through-hole and the second row along its short transverse Sink is tightly connected.
Invention by adopting the above technical scheme, by permeable stake shell be arranged in cone pile top and trapezoidal stake top it Between, globality, the anti-pulling capacity, Compressive Bearing Capacity of drainage pile can be improved.Pile top, stake top, stake core are by bar frame and coagulation Soil is prepared, its globality and bearing capacity equally can be improved.Interstitial water in liquefiable layer passes through water penetration pile shell, first row Sink, the second rhone, drainage channel, through-hole discharge, reach and eliminate liquefied purpose.Drainage pile is being squeezed into predetermined depth Afterwards, it is inserted into drainpipe on drainage channel top, is excluded the pore water in liquefiable layer by vacuum pump, vacuum pump makes Drainage pile forms negative pressure, pump drainage underground water and generation vacuum, can reduce the content and effective stress of underground water in advance, work as underground water Content when being reduced to the standard that can be tamped, tamped, so that liquefying soil is rapidly solidified.When earthquake, if generated super Quiet pore water, since drainage pile is in faint negative pressure state, pore water from water penetration pile shell, the first rhone, the second rhone, Drainage channel dissipates, and eliminates liquefied purpose to reach.
Preferably, the bar frame includes being located to one kind as a kind of high frequency drainage pile for liquefaction of sand of the present invention Two layers of steel mesh of the stake in-core is attached fixation by oblique reinforcing bar between the steel mesh.
Preferably, the steel mesh includes laterally to another kind as a kind of high frequency drainage pile for liquefaction of sand of the present invention Reinforcing bar and vertical reinforcement, the both ends of the vertical reinforcement are respectively protruding into the stake top and the pile top.
Another as a kind of high frequency drainage pile for liquefaction of sand of the present invention is preferred, and the bar frame further includes Horizontal mesh reinforcement in the stake top, the horizontal mesh reinforcement and the fixed company of the vertical reinforcement extending into the stake top It connects.
It is fixed between double layer bar by oblique reinforcing bar, stake top is protruded at vertical reinforcement both ends and pile top, stake top setting water Flat reinforcing bar, horizontal reinforcement are simultaneously fixed with vertical reinforced-bar-welding, and pile top, stake top, the globality of stake core can be improved, improve its resistance to compression and hold Loading capability and resistance to plucking bearing capacity.
Another as a kind of high frequency drainage pile for liquefaction of sand of the present invention is preferred, and the outer surface of the stake shell is in Waveform.
Waveform can increase contact area, can be faster through permeable shell, the first rhone, row when generating pore water Aquaporin, the second rhone, through-hole dissipate.
Preferably, the outer surface of the stake core is spread another kind as a kind of high frequency drainage pile for liquefaction of sand of the present invention Equipped with one layer of permeable geotextiles, the permeable geotextiles are located at the top surface of first rhone.
Tensile strength can be improved in permeable geotextiles, and can avoid the first rhone and blocked.
Detailed description of the invention
The present invention can be further illustrated by the nonlimiting examples that attached drawing provides;
Fig. 1 is that the present invention removes the structural schematic diagram after drain line;
Fig. 2 is that the present invention removes the structural schematic diagram after bar frame;
Fig. 3 is the schematic cross-section of A-A in Fig. 2;
Fig. 4 is the enlarged structure schematic diagram of bar frame;
Fig. 5 is the enlarged drawing of B in Fig. 3;
Main element symbol description is as follows:
Stake core 1, the first rhone 11, the second rhone 12, drainage channel 13, permeable geotextiles 14, stake shell 2, stake top 3, Through-hole 31, pile top 4, steel mesh 51, transverse steel 511, vertical reinforcement 512, oblique reinforcing bar 52, horizontal mesh reinforcement 53.
Specific embodiment
In order to make those skilled in the art that the present invention may be better understood, with reference to the accompanying drawings and examples to this hair Bright technical solution further illustrates.
As shown in Fig. 1,2,3,4,5, a kind of high frequency drainage pile for liquefaction of sand successively includes waterproof from inside to outside Stake core, the water penetration pile shell with stake core concentric shafts, it is trapezoidal waterproof stake top that the top of stake core, which is fixedly connected with section, stake core Bottom end is fixedly connected with the waterproof pile top of taper, and pile top, stake top, stake core are prepared by bar frame and concrete, stake top, The diameter of pile top is greater than the diameter of stake core, and stake shell is between stake top and pile top;Stake core offers the first rhone, the second draining Slot, drainage channel, the first rhone are provided with its side surface along the length direction of stake core, the second rhone along stake core length Degree direction is provided with its top surface, and drainage channel is for being connected to the first rhone and the second rhone;Stake top is along its short transverse Through-hole is offered, through-hole and the second rhone are tightly connected.
Bar frame includes two layers of steel mesh positioned at stake in-core, is attached between steel mesh by oblique reinforcing bar solid It is fixed.
Steel mesh includes transverse steel and vertical reinforcement, and the both ends of vertical reinforcement are respectively protruding into stake top and pile top.
Bar frame further includes the horizontal mesh reinforcement in stake top, horizontal mesh reinforcement and the vertical steel extending into stake top Muscle is fixedly connected.
The outer surface of stake shell is wavy.
The outer surface of stake core is equipped with one layer of permeable geotextiles, and permeable geotextiles are located at the top surface of the first rhone.
By permeable stake shell be arranged in cone pile top and trapezoidal stake top between, can be improved drainage pile globality, Anti-pulling capacity, Compressive Bearing Capacity.Pile top, stake top, stake core are prepared by bar frame and concrete, and it is whole that its equally can be improved Body and bearing capacity.Interstitial water in liquefiable layer by water penetration pile shell, the first rhone, the second rhone, drainage channel, Through-hole discharge, reaches and eliminates liquefied purpose.After drainage pile is squeezed into predetermined depth, it is inserted into and drains on drainage channel top Pipe, is excluded the pore water in liquefiable layer by vacuum pump, and vacuum pump makes drainage pile form negative pressure, pump drainage underground water With generation vacuum, the content and effective stress of underground water can be reduced in advance, when the content of underground water is reduced to the standard that can be tamped When, it is tamped, so that liquefying soil is rapidly solidified.When earthquake, if generating super quiet pore water, since drainage pile is in micro- Weak negative pressure state, pore water dissipates from water penetration pile shell, the first rhone, the second rhone, drainage channel, to reach Eliminate liquefied purpose.
It is fixed between double layer bar by oblique reinforcing bar, stake top is protruded at vertical reinforcement both ends and pile top, stake top setting water Flat reinforcing bar, horizontal reinforcement are simultaneously fixed with vertical reinforced-bar-welding, and pile top, stake top, the globality of stake core can be improved, improve its resistance to compression and hold Loading capability and resistance to plucking bearing capacity.
A kind of high frequency drainage pile for liquefaction of sand provided by the invention is described in detail above.Specific implementation The explanation of example is merely used to help understand method and its core concept of the invention.It should be pointed out that for the general of the art , without departing from the principle of the present invention, can be with several improvements and modifications are made to the present invention for logical technical staff, this A little improvement and modification are also fallen within the protection scope of the claims of the present invention.

Claims (6)

1. a kind of high frequency drainage pile for liquefaction of sand, it is characterised in that: from inside to outside successively include waterproof stake core and institute The water penetration pile shell of a core concentric shafts is stated, it is trapezoidal waterproof stake top, the stake that the top of the stake core, which is fixedly connected with section, The bottom end of core is fixedly connected with the waterproof pile top of taper, the pile top, stake top, stake core by bar frame and concrete preparation and It is greater than the diameter of stake core at the diameter of, the stake top, pile top, the stake shell is between the stake top and the pile top;It is described Stake core offers the first rhone, the second rhone, drainage channel, and first rhone is opened up along the length direction of stake core In its side surface, second rhone is provided with its top surface along the length direction of stake core, and the drainage channel is for being connected to First rhone and second rhone;The stake top offers through-hole, the through-hole and institute along its short transverse State the sealed connection of the second rhone.
2. a kind of high frequency drainage pile for liquefaction of sand according to claim 1, it is characterised in that: the bar frame Including two layers of steel mesh positioned at the stake in-core, fixation is attached by oblique reinforcing bar between the steel mesh.
3. a kind of high frequency drainage pile for liquefaction of sand according to claim 2, it is characterised in that: the steel mesh packet Transverse steel and vertical reinforcement are included, the both ends of the vertical reinforcement are respectively protruding into the stake top and the pile top.
4. a kind of high frequency drainage pile for liquefaction of sand according to claim 3, it is characterised in that: the bar frame It further include the horizontal mesh reinforcement in the stake top, the horizontal mesh reinforcement and the vertical reinforcement extending into the stake top are solid Fixed connection.
5. a kind of high frequency drainage pile for liquefaction of sand according to claim 1, it is characterised in that: outside the stake shell Surface is wavy.
6. a kind of high frequency drainage pile for liquefaction of sand according to claim 1, it is characterised in that: outside the stake core Surface is equipped with one layer of permeable geotextiles, and the permeable geotextiles are located at the top surface of first rhone.
CN201811452352.5A 2018-11-30 2018-11-30 A high frequency drainage stake for sandy soil liquefaction Active CN109339027B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111501714A (en) * 2020-04-13 2020-08-07 陕西师范大学 Underground water dredging and controlling pipe for ancient site and using method thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203334274U (en) * 2013-06-14 2013-12-11 盐城工学院 Novel self-draining pile
CN103437371A (en) * 2013-08-29 2013-12-11 湖南城市学院 Construction method of water drainage uplift pile
CN205088671U (en) * 2015-11-12 2016-03-16 中国电建集团成都勘测设计研究院有限公司 Precast concrete drainage stake
CN105525608A (en) * 2016-01-29 2016-04-27 中国石油大学(华东) Liquefaction-resisting prefabricated concrete square drainage pile
CN206655217U (en) * 2017-01-20 2017-11-21 重庆工程职业技术学院 Precast concrete drainage pile

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203334274U (en) * 2013-06-14 2013-12-11 盐城工学院 Novel self-draining pile
CN103437371A (en) * 2013-08-29 2013-12-11 湖南城市学院 Construction method of water drainage uplift pile
CN205088671U (en) * 2015-11-12 2016-03-16 中国电建集团成都勘测设计研究院有限公司 Precast concrete drainage stake
CN105525608A (en) * 2016-01-29 2016-04-27 中国石油大学(华东) Liquefaction-resisting prefabricated concrete square drainage pile
CN206655217U (en) * 2017-01-20 2017-11-21 重庆工程职业技术学院 Precast concrete drainage pile

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111501714A (en) * 2020-04-13 2020-08-07 陕西师范大学 Underground water dredging and controlling pipe for ancient site and using method thereof
CN111501714B (en) * 2020-04-13 2021-09-17 陕西师范大学 Underground water dredging and controlling pipe for ancient site and using method thereof

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