CN204059390U - For two casing bored piles of deep-etching salinized soil - Google Patents
For two casing bored piles of deep-etching salinized soil Download PDFInfo
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- CN204059390U CN204059390U CN201420185638.2U CN201420185638U CN204059390U CN 204059390 U CN204059390 U CN 204059390U CN 201420185638 U CN201420185638 U CN 201420185638U CN 204059390 U CN204059390 U CN 204059390U
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Abstract
The utility model belongs to field of civil engineering, particularly relates to a kind of two casing castinplace pile for deep-etching salinized soil and construction method thereof.Two casing bored piles for deep-etching salinized soil of the present utility model, comprise outer casing (7) and interior casing (1), interior casing (1) is positioned at outer casing (7), and interior casing (1) is precast concrete, configuration reinforcement skeleton in concrete.In steel concrete of the present utility model, casing can in the prefabricated or site prefabrication of factory for prefabrication's batch, and the detailing requiments such as the concrete quality of casing and protective layer thickness can be fully guaranteed; Interior casing on-site consolidation and convenience in place, can not bring too much trouble to construction.
Description
Technical field
The utility model belongs to field of civil engineering, particularly relates to a kind of two casing castinplace pile for deep-etching salinized soil and construction method thereof.
Background technology
The salinized soil of different range is all had to distribute in countries in the world and area.China's salinized soil is mainly distributed in the lower Plain of hinterland physical features or basin.Secondly, the distribution of equivalent area is also had at coastal region and some lake basin depression.The main feature of salinized soil is containing more salt, and the salinized soil of offshore area is mainly with containing villaumite being main (NaCl, CaCl
2, MgCl
2deng), and hinterland, have based on (as the Qinghai Area) containing villaumite, that also have is then (Na based on containing sulfate
2sO
4deng), and be in most cases villaumite, sulfate exists simultaneously.Data shows, the villaumite in a lot of coastal region underground water, sulfate, magnesium salts content are all far away higher than seawater, and some places villaumite exceeds concentration of seawater more than 10 doubly, and sulfate even exceeds concentration of seawater 20 times.This certainly will form stronger corrosion to building foundation and underground installation and threaten, and may have a strong impact on its durability and safety.So, be necessary to take certain anticorrosive measure to ensure that reinforced concrete structure does not corrode within regulation service life.Along with the development and construction in China coast and landlocked saline soil area, the etching problem of salinized soil is particularly outstanding and important, and the reasonable solution of this problem is significant to national economy.
Bored pile foundation due to its construction technology maturation, bearing capacity high (can large diameter pile be built), be applied widelyly widely used in highway, railway and building field, wherein, full casing castinplace pile is a kind of comparatively conventional constructure scheme, for the ease of the recycling of casing material, two casing constructure scheme is developed on the basis of also single casing pouring construction in early days.But bored pile belongs to concealed work, quality control difficulty is comparatively large, may there is protective layer thickness deviation comparatively large, and concrete density poor (actual cast-in-place pile concrete intensity is well below proof strength value), even occurs the problems such as broken pile.Under severe corrosive salinized soil environment, this inborn deficiency certainly will cause larger danger and hidden danger to its durability and safety.
There are some researches show, common Concrete Anti corrosion measure comprises the thickness and raising concrete class that increase concrete cover.But in the environment of salinized soil seriously corroded, the durability only improving works by these two kinds of measures is inadequate, must take suitable anticorrosion engineering measure.Effective addition thereto of ACI (ACI) up-to-date confirmation four kinds protection steel concrete: (1) abundant wet-cured low water binder ratio is two mixes (high efficiency water reducing agent and breeze) high performance concrete, resistant material is coated and apply rebar surface (epoxy-coated reinforcement, stainless steel partly embedded), electrochemical protection (cathodic protection, electrochemical desalting, reinforcing steel bar corrosion inhibitor) and reinforced concrete surface anticorrosive paint (impermeable coating, sprayed silicon alkanes hydrophobic material, permeability Control architecture).
Chinese patent application disclosed in 10 days July in 2013, publication number: CN103195052A, it discloses a kind of castinplace pile for corrosion of high-concentration salt solution environment and construction method thereof, propose to put steel pile casting at this body concrete of pile foundation peripheral hardware, ensure pile foundation endurance life by the anticorrosion time limit of respective thickness steel pile casting.But in corrosion of high-concentration salt solution environment (particularly the drying and watering cycle section of bar in chlorine salt solution), steel pile casting is easy to corrosion, and do not reach long-term protection effect, waste a large amount of steel, economic benefit is not good enough.
Utility model content
Technique effect of the present utility model can overcome above-mentioned defect, provides a kind of two casing bored piles for deep-etching salinized soil, and it combines preformed pile reliable in quality, stablizes, and bored pile is applied widely, is convenient to the advantage of shaping large diameter pile.Meanwhile, the measure adopting multiple raising reinforced concrete structure corrosion resistance can be combined, to the durability Be very effective ensureing cast-in-place pile concrete structure.
For achieving the above object, the utility model adopts following technical scheme: it comprises outer casing and interior casing, and interior casing is positioned at outer casing, and interior casing is precast concrete, configuration reinforcement skeleton in concrete.
In precast concrete, casing is core of the present utility model, and when building pile concrete, cylindrical shell plays a role as permanent formwork.Pour stake body by concrete is complete, and cylindrical shell becomes again protective barrier and the pile body inalienable part of castinplace pile body.Outer casing: adopt Q235 steel plate to roll and form, identical with the outer casing of tradition full casing filling pile construction, the requirement of strength and stiffness should be met.Pile concrete builds the complete final set state that reaches can pull out outer casing, recycles.
Casing in prefabricated reinforced concrete: prefabricate, stack shell concrete adopts the corresponding high performance concrete meeting the requirement of deep-etching salinized soil environment, and concrete match ratio can carry out special design according to corresponding durability Design specification (i.e. GB/T50476-2008 " durability design specification ", GB50007-2011 " Code for design of building ", " Code for design of corrosion prevention of industrial buildings " (GB50046-2008)).
Core of the present utility model is, interior casing have employed a kind of new structure (or material)-prefabricated reinforced concrete, and interior casing tubular construction is simple, and precasting process is convenient.The utility model core is mainly at following 2 points: (1) prior art for casing in two casing castinplace pile, employing be all that steel roll.
And the utility model proposes to adopt casing in prefabricated reinforced concrete first; in its prefabricated reinforced concrete, casing can factory be produced in batches; prefabricated interior casing adopts the high performance concrete meeting requirement for anticorrosion; its match ratio will do specialized designs according to corresponding specification, and the structure such as its protective layer thickness all conscientiously need design according to code requirement.In the prefabricated reinforced concrete of finished product, casing is directly transported to onsite application, and in the prefabricated reinforced concrete of finished product, casing periphery does not need steel, greatly provides cost savings; Prefabricated interior casing inside wants poured in place concrete as this body concrete of pile foundation, due to the protection having prefabricated casing, need not do special requirement to poured in place concrete, adopt ordinary concrete.(2) the two casing filling pile construction of prior art, concreting is complete, and inside and outside casing all will be pulled out, and also has interior casing not pull out, and stays as concrete protective barrier, to resist the corrosion of deep-etching salinized soil.But in the steel stayed, casing is directly exposed to corrosive medium, and steel are perishable.In prefabricated reinforced concrete of the present utility model, casing both can protect pile body not corroded, and did not increase expense again, more with the obvious advantage than steel pile casting, and be that existing technical staff never expects, its effect is significant.
Interior casing near stake end is prefabricated into shoe, so that interior casing sinks in place.Be wound around the rope made of hemp between shoe and outer casing, play the effect of grouting, when preventing this body concrete of poured pile base, cement paste enters outer casing.
Interior casing is topmost provided with interior casing cap.Assembled complete and transfer casing end face in prefabricated reinforced concrete in place should to flush with design of pile top elevation or close, in order to eliminate the impact of concrete laitance, ensure stake top concrete quality, simultaneously, concrete is avoided to enter the gap between inside and outside cylinder from upper end, therefore casing cap in steel is set, pouring concrete is complete, can remove, recycles after reaching initial set.
Cage of reinforcement comprises spaced longitudinal reinforcement, the outside configuration stirrup of longitudinal reinforcement.The external surface spray epoxy coating of longitudinal reinforcement.Longitudinal reinforcement in interior casing calculates configuration according to construction stage load.
The two ends up and down of interior casing are respectively equipped with pre-embedded steel slab, are connected between neighbouring interior casing by pre-embedded steel slab.When adopting prefabricate, cylinder section two ends are respectively embedded with steel plate, with bolts by pre-embedded steel slab between adjacent two sections of cylindrical shells.The often end of interior casing is at least provided with three pieces of pre-embedded steel slabs.
The lateral surface coating anti-rot material of interior casing, to improve the ability that cylindrical shell opposing strong corrosive medium corrodes further, improves the ability of cylindrical shell opposing salt corrosion.
The lateral surface of interior casing is provided with suspension hook, for the lifting of prefabricated interior casing.Prefabricated sleeve hoisting bracket (construction gadget): adopt universal rod body or the assembled interim hoisting bracket of Bailey beam.Mid-stent need reserve is enough to allow sleeve prefabricated section of space from top to bottom passed.
Interior casing inner hollow and up/down perforation, interior casing is cylinder.
Another object of the present utility model is to provide casing in the outer casing of the above-mentioned employing steel pipe of a kind of employing and prefabricated reinforced concrete and carries out two casing bored pile construction method, comprises the steps:
(1) the outer casing of steel pipe is set: make outer casing, and set in place by outer casing;
(2) boring and clear hole: adopt usual manner to carry out boring and clear hole, in boring procedure, keeps the slurry coat method having suitable head pressure in casing or adopt suitable head height;
(3) in prefabricated reinforced concrete, casing sinks in place: utilize the falsework be arranged at directly over position, hole to suspend casing section in the prefabricated reinforced concrete made in advance in midair, and with bolt, interior casing is spliced section by section, sunk, accurately in place;
(4) reinforcing bar cage hoisting, location: adopt usual manner to carry out lifting and the location of borehole filling pile cage of reinforcement;
(5) filling concrete: before the shoe of casing is sunk in first section, be wound around the rope made of hemp in outside in advance, play the effect of grouting, when preventing castinplace pile body concrete, cement paste enters outer casing, adopts conventional method to carry out the perfusion of pile concrete;
(6) outer casing is extracted and is removed with casing cap in steel: after drill-pouring pile concreting completes, treat that concrete reaches final set and can extract outer casing, casing cap in removing, recycles and reuses.
In steel concrete of the present utility model, casing can in the prefabricated or site prefabrication of factory for prefabrication's batch, and the detailing requiments such as the concrete quality of casing and protective layer thickness can be fully guaranteed; Interior casing on-site consolidation and convenience in place, can not bring too much trouble to construction; In the outer casing of steel pipe and steel, casing cap all can be recycled, and greatly reduces steel consumption; In steel concrete, casing participates in stressed as a part for pile body together with the concrete of follow-up cast, additionally do not increase the material usage of engineering, and owing to having this protective barrier, pile concrete need not drop into too much cost in its density of raising and antiseptic power, adopts ordinary concrete; In addition, utilize casing in steel concrete can also utilize the addition thereto such as sprayed silicon alkanes hydrophobic material easily, reach the object improving castinplace pile opposing deep-etching salinized soil erosiveness further.
Accompanying drawing explanation
Fig. 1 is internal construction schematic diagram of the present utility model;
Fig. 2 is interior casing schematic cross-sectional view of the present utility model;
Fig. 3 is interior casing elevational schematic view of the present utility model.
In figure: casing in 1-; Casing cap in 2-; 3-longitudinal reinforcement; 4-stirrup; 5-pre-embedded steel slab; 6-suspension hook; The outer casing of 7-; 8-shoe; The 9-rope made of hemp.
Detailed description of the invention
As shown in Figure 1-Figure 3, the two casing bored piles for deep-etching salinized soil of the present utility model, comprise outer casing 7 and interior casing 1, interior casing 1 is positioned at outer casing 7, and interior casing 1 is precast concrete, configuration reinforcement skeleton in concrete.
Interior casing section near stake end is prefabricated into shoe 8, is wound around the rope made of hemp 9 between shoe 8 and outer casing 7.Interior casing section is topmost provided with interior casing cap 10.Cage of reinforcement comprises spaced longitudinal reinforcement 3, the outside configuration stirrup 4 of longitudinal reinforcement 3.The two ends up and down of interior casing are respectively equipped with four pieces of pre-embedded steel slabs 5, are connected between neighbouring interior casing section by pre-embedded steel slab 5.The lateral surface of urceolus 2 is provided with suspension hook 6.The lateral surface coating anti-rot material of urceolus 2.The external surface spray epoxy coating of longitudinal reinforcement 3.Interior casing 1 is cylinder, interior casing 1 inner hollow and up/down perforation, and namely, casing 1 is hollow-core construction, and inside is concreting at the construction field (site).
Construction method of the present utility model, comprises the steps:
(1) the outer casing of steel pipe is set: make outer casing, and set in place by outer casing;
(2) boring and clear hole: adopt usual manner to carry out boring and clear hole, in boring procedure, keeps the slurry coat method having suitable head pressure in casing or adopt suitable head height;
(3) in prefabricated reinforced concrete, casing sinks in place: utilize the falsework be arranged at directly over position, hole to suspend casing section in the prefabricated reinforced concrete made in advance in midair, and with bolt, interior casing is spliced section by section, sunk, accurately in place;
(4) reinforcing bar cage hoisting, location: adopt usual manner to carry out lifting and the location of borehole filling pile cage of reinforcement;
(5) filling concrete: before the shoe of casing is sunk in first section, be wound around the rope made of hemp in outside in advance, play the effect of grouting, when preventing castinplace pile body concrete, cement paste enters outer casing, adopts conventional method to carry out the perfusion of pile concrete;
(6) outer casing is extracted and is removed with casing cap in steel: after drill-pouring pile concreting completes, treat that concrete reaches final set and can extract outer casing, casing cap in removing, recycles and reuses.
Claims (7)
1. the two casing bored piles for deep-etching salinized soil, it is characterized in that, comprise outer casing (7) and interior casing (1), interior casing (1) is positioned at outer casing (7), interior casing (1) is precast concrete, configuration reinforcement skeleton in concrete; Interior casing (1) near stake end is prefabricated into shoe (8), is wound around the rope made of hemp (9) between shoe (8) and outer casing (7); Interior casing (1) is topmost provided with interior casing cap (2).
2. the two casing bored piles for deep-etching salinized soil according to claim 1, it is characterized in that, cage of reinforcement comprises spaced longitudinal reinforcement (3), outside configuration stirrup (4) of longitudinal reinforcement (3).
3. the two casing bored piles for deep-etching salinized soil according to claim 1 and 2, it is characterized in that, the two ends up and down of interior casing (1) are respectively equipped with pre-embedded steel slab (5), are connected between neighbouring interior casing (1) by pre-embedded steel slab (5).
4. the two casing bored piles for deep-etching salinized soil according to claim 3, is characterized in that, the often end of interior casing (1) is at least provided with three pieces of pre-embedded steel slabs (5).
5. the two casing bored piles for deep-etching salinized soil according to claim 1, is characterized in that, the lateral surface of interior casing (1) is provided with suspension hook (6).
6. the two casing bored piles for deep-etching salinized soil according to claim 1, is characterized in that, the lateral surface coating anti-rot material of interior casing (1), the external surface spray epoxy coating of longitudinal reinforcement (3).
7. the two casing bored piles for deep-etching salinized soil according to claim 1, is characterized in that, interior casing (1) inner hollow and up/down perforation, and interior casing (1) is cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420185638.2U CN204059390U (en) | 2014-04-16 | 2014-04-16 | For two casing bored piles of deep-etching salinized soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420185638.2U CN204059390U (en) | 2014-04-16 | 2014-04-16 | For two casing bored piles of deep-etching salinized soil |
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| CN204059390U true CN204059390U (en) | 2014-12-31 |
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|---|---|---|---|
| CN201420185638.2U Expired - Fee Related CN204059390U (en) | 2014-04-16 | 2014-04-16 | For two casing bored piles of deep-etching salinized soil |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103967032A (en) * | 2014-04-16 | 2014-08-06 | 青岛理工大学 | Double-protective-cylinder cast-in-situ bored pile used for highly-corrosive salty soil and construction method of double-protective-cylinder cast-in-situ bored pile |
| CN104563098A (en) * | 2015-01-21 | 2015-04-29 | 成都市第四建筑工程公司 | Construction method of pore-forming pouring pile in dry work of super-large-diameter full-steel pipe casing |
| CN114227900A (en) * | 2021-12-20 | 2022-03-25 | 河南五建第二建筑安装有限公司 | Prefabricating method of reinforcement cage for long spiral drilling pressure-grouting pile |
-
2014
- 2014-04-16 CN CN201420185638.2U patent/CN204059390U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103967032A (en) * | 2014-04-16 | 2014-08-06 | 青岛理工大学 | Double-protective-cylinder cast-in-situ bored pile used for highly-corrosive salty soil and construction method of double-protective-cylinder cast-in-situ bored pile |
| CN104563098A (en) * | 2015-01-21 | 2015-04-29 | 成都市第四建筑工程公司 | Construction method of pore-forming pouring pile in dry work of super-large-diameter full-steel pipe casing |
| CN114227900A (en) * | 2021-12-20 | 2022-03-25 | 河南五建第二建筑安装有限公司 | Prefabricating method of reinforcement cage for long spiral drilling pressure-grouting pile |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141231 Termination date: 20160416 |
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| CF01 | Termination of patent right due to non-payment of annual fee |