CN102505684B - Hollow stiffness-core slurry-solidified discrete material pile and construction method thereof - Google Patents

Hollow stiffness-core slurry-solidified discrete material pile and construction method thereof Download PDF

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Publication number
CN102505684B
CN102505684B CN201110341205.2A CN201110341205A CN102505684B CN 102505684 B CN102505684 B CN 102505684B CN 201110341205 A CN201110341205 A CN 201110341205A CN 102505684 B CN102505684 B CN 102505684B
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pile
slurry
hole
discrete material
solidified
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CN102505684A (en
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丁选明
刘汉龙
陈育民
孔纲强
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Hohai University HHU
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Hohai University HHU
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Abstract

The invention discloses a hollow stiffness-core slurry-solidified discrete material pile and a construction method thereof. The periphery of a pile body is a slurry-solidified discrete material pile. The center of the pile body is a small-diameter prefabricated concrete pipe pile. Slurry filling holes are left on the pile wall of the prefabricated concrete pipe pile at intervals. Slurry enters discrete materials through holes in the middle of the concrete pipe pile and the slurry filling holes. Peripheral discrete materials are integrally cemented and solidified through cement slurry. At the same time, under the effect of slurry filling pressure, the slurry seeps into pile periphery soil bodies and the strength of the pile periphery soil is improved; the slurry fills the holes in the middle of the concrete pipe pile; and a prefabricated pipe pile can be formed by multiple sections which can be connected through bolts. The construction method comprises technical steps of: forming holes, placing the pipe pile, installing a sealing cover and a slurry filling pump, washing the holes by using clean wash, putting the discrete materials, filling the slurry, solidifying, forming the pile and the like. The hollow stiffness-core slurry-solidified discrete material pile and the construction method have the advantages that the construction processes are clear, the construction speed is fast, the pile forming effect is good, the bearing capacity is high, the manufacturing cost is low, the resources are fully utilized, the environment is protected and the energy is saved.

Description

A kind of hollow stiffness-core slurry-solidified discrete material pile and construction method thereof
Technical field
The invention belongs to civil construction project technical field, particularly a kind of hollow stiffness-core slurry-solidified discrete material pile and construction method thereof.
Background technology
In the engineering constructions such as road, harbour, bridge, pile foundation is extensive.Vertical Bearing Capacity of Pile Foundation is made up of pile side friction and end resistance two parts, seems particularly important in the performance of deep soft soil foundation Lateral frictional resistance.How improving unit materials rate of utilization of strength, in saving constructional materials consumption, improve bearing capacity of pile foundation, is one of long-term important topic of paying close attention to of researcher.In addition, along with the quickening of China's urban construction process, produce the building wastes such as a lot of waste bricks, stone, concrete block, slag, how these building wastes being turned waste into wealth is used, and is the problem that is worth research.
The discrete material piles such as current broken stone pile, sand pile are a kind of pile foundation types conventional in engineering, but the intensity of discrete material pile itself is lower, can only bear less load.Have a variety of methods can improve strength of the mixing pile, for example in pile body, gain in strength higher " strength core " strengthens strength of the mixing pile, reaches the effect of rigid pile.
Before the present invention, China applies for a patent (application number: 200310112791.9) disclose a kind of strength core composite pile and construction method, the periphery of pile body is bulk solid stake, and bulk solid Zhuan center arranges high bond strength stake core and forms compound pile, to improve strength of the mixing pile.But the intensity of this type periphery discrete material is low, be difficult to improve larger frictional force, pile body easily makes discrete material separate with high bond strength stake core under compared with large external load effect and reduces bearing capacity.The high bond strength stake core that center arranges is simultaneously solid pile body, solid pile body concrete large usage quantity, and differ greatly with discrete material rigidity, be difficult for the supporting capacity of its material of performance.As improved strength of the mixing pile, can adopt cement grout that all stake discrete materials are solidified, but a stake core for the compound pile body of this strength heart is entity stake, there is no the passage of slip casting, therefore can not carry out grouting and reinforcing.In discrete material, with vibration sinking tube method injection stake core, vibration itself has considerable influence to surrounding environment, and when the discrete material material that to be rubble etc. harder, immersed tube is difficult for squeezing into, enables to squeeze into, and also needs very large energy, has therefore wasted the energy.
Summary of the invention
The object of the invention is to overcome above-mentioned defect, a kind of hollow stiffness-core slurry-solidified discrete material pile and construction method thereof are provided.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of hollow stiffness-core slurry-solidified discrete material pile, and outside pile body
Week is slurry-solidified discrete material pile, and pile body center is minor diameter prefabricated concrete pipe pile, and prefabricated hollow concrete pile tube pile lining has injected hole at a certain distance, and slurries enter discrete material by hole and injected hole in the middle of hollow concrete pile; Periphery discrete material adopts the cementing entirety that is frozen into of cement paste; Slurries infiltrate pile peripheral earth under grouting pressure effect, improve all native intensity of stake; Slurries fill up the hole in the middle of concrete pile simultaneously; Described prefabricated concrete pipe pile external diameter is 200 ~ 300 mm, and wall thickness is 50 ~ 100 m, on pile lining longitudinal section, leaves injected hole every 0.2 ~ 0.5 m, and injected hole is quincunx and is interspersed; Seal cover is installed at described prefabricated concrete pipe pile top; The discrete material that described pile body is filled can be rubble, sand, can be also building pigment rubbish or discarded slag.In the time that stake is long, prefabricated tubular pile can be formed by connecting by multistage, and connected mode preferred bolt connects.
The construction method of a kind of hollow stiffness-core slurry-solidified discrete material pile of the present invention adopts following technical step to realize:
(1) rig enters ground to projected depth pile hole, and stake hole periphery adopts mud off;
(2) in stake hole, put into minor diameter prefabricated concrete pipe pile, in the time that pile tube is multistage, put into for rear one section one section with bolts;
(3) seal cover is installed at pile tube top, seal cover is connected with grouting pump by flexible pipe;
(4) inject clear water hole flushing by the hole of pile tube pile lining;
(5) in stake hole, drop into discrete material;
(6) in stake hole, inject slurries by the hole of pile tube pile lining by grouting pump;
(7) the fixed rear pile of slurries and aggregate penetrating in pile peripheral earth is full of the cavity of pile tube inside simultaneously.
Advantage of the present invention and effect are:
Concrete tubular pile can adopt prestressed high-strength concrete pile, and strength of the mixing pile can reach C80, even higher, and therefore after pile, pile foundation supporting capacity is high, can be used as building pile foundation; After hollow stiffness-core slurry-solidified discrete material pile pile, discrete material improves greatly with original discrete material phase specific strength after adopting cement grout cementing; Slurries except in stake hole with the fixed pile of aggregate, also part is infiltrated the soil body, improves the character of pile peripheral earth, has therefore greatly improved the side friction of pile foundation; Material of body of a pile can be the refuses such as rubble, fragment of brick or slag as aggregate (discrete material), effectively protection of the environment, reduce construction cost; Discrete material through slurries are cementing solidify after, intensity is significantly improved, and forms rigidity pile body; Adopt dexterously pile tube as grouting channel, after grouting, pile tube is stayed in slurry solid, does not need to extract, and therefore construction technology is more simple efficient; Construction friction, noiselessness.The present invention a kind ofly adopts concrete tubular pile as grouting pipe and introduces the soft base processing method that slurry injection technique adds bonded dispersed body material, and expanded diameter is 500~700 mm, stake is long reach 30 m more than.
In a word, construction technology of the present invention is clear, and speed of application is fast, and pile-forming effect is good, and bearing capacity is high, and cost is low, and makes full use of resource, protection of the environment, reaches the effect of energy-conserving and environment-protective.
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Protection scope of the present invention is not limited with detailed description of the invention, but is limited by claim.
Brief description of the drawings
Fig. 1 hollow stiffness-core slurry-solidified discrete material pile schematic diagram of the present invention;
A-A position top view in Fig. 2 Fig. 1 of the present invention;
Fig. 3 construction method schematic diagram of the present invention, in figure, (a) is pore-forming; (b) for putting into pile tube; (c) be clear water hole flushing after seal cover being installed and being connected grouting pump; (d) for dropping into discrete material; (e) be slip casting; (f) for removing seal cover pile;
Fig. 4 pile tube screwed joint of the present invention schematic diagram.
In figure: 1 is prefabricated tubular pile, 2 is slurry bonded dispersed body material, and 3 is slurries diffusion region, and 4 is slurries, and 5 is injected hole, and 6 is screwed joint.
Detailed description of the invention
As shown in Figure 1,2 and 3, a kind of hollow stiffness-core slurry-solidified discrete material pile, be made up of prefabricated tubular pile (1), slurry bonded dispersed body material (2) and slurries diffusion region (3), prefabricated tubular pile (1) inside is full of slurries (4), and prefabricated tubular pile (1) pile lining leaves injected hole (5).The present invention forms pile body diameter at 500-700 mm, and adopting prefabricated tubular pile (1) diameter is 200-300 mm.
A construction method for hollow stiffness-core slurry-solidified discrete material pile, its construction sequence is:
The first step, pore-forming.The pore-forming of the solid stake of slurry requires basically identical with the pore forming process of general bored pile.Generally use rig pore-forming, natural pulping retaining wall, in the situation that hole wall is difficult for keeping, adopts artificial pulping retaining wall.In engineering application, adopt bentonite to add alkali and carry out artificial pulping retaining wall, the specific gravity control of mud is in certain scope.
Second step, transfers prefabricated tubular pile (1).Prefabricated tubular pile (1) is generally prestressed concrete pipe pile, the spacing of 0.2 ~ 0.5 m of being often separated by its pile lining arranges one group of injected hole (5), and interlaced arrangement, to see and be quincuncial arrangement from pile lining side, each cross section arranges more than 2 or 2 injected hole (5), each injected hole (5) is evenly arranged on cross section, if arrange two, be arranged symmetrically with, if arrange three, every hole 120 ° of central angles apart, the like.The diameter of injected hole (5) is 0.5 ~ 2 cm.Prefabricated tubular pile (1) can be 1, also can many, and long depending on stake, if many, the jointing between two piles preferably adopts screwed joint (6) connection (as Fig. 4) being made up of male and female mouth, also can adopt welding connecting mode to fix.Multistage prefabricated tubular pile (1) can be put into after one section of one section of connection.
The 3rd step, installs seal cover and connects slurry filling machine.Seal cover can adopt steel to make, and its diameter equates with prefabricated tubular pile (1) external diameter, and the contact surface at seal cover bottom and prefabricated tubular pile (1) top arranges rubber ring, and rubber ring fixedly sticks on seal cover.On the stirrup of prefabricated tubular pile (1) top, threaded bolt hole is set, in seal cover relevant position, bolt hole is also set, adopt bolt that seal cover is fixed on to prefabricated tubular pile (1) end face.In the middle of seal cover, have hole, and connecting hose is communicated with grouting pump.
The 4th step, clear water hole flushing.By the pressure of grouting pump, clear water is injected to hole and clean hole.
The 5th step, throws in discrete material.The building waste such as rubble, fragment of brick, slag etc. are directly dropped in stake hole.Be that the hole flushing of aggregate limit is thrown on limit throwing in aggregate process.Throwing in the process of aggregate, for preventing that aggregate collision hole wall from causing collapse hole, the special guider that feeds intake is set and guides aggregate, its effect be prevent that other foreign material from falling into boring and making aggregate vertically fall into hole at the bottom of.
The 6th step, slip casting.Open grouting pump, the cavity of slurries in the middle of flexible pipe enters prefabricated tubular pile (1), and enter into discrete material through injected hole (5), make the fixed formation slurry bonded dispersed body material of discrete material (2).Slurries infiltrate pile peripheral earth formation slurries diffusion region (3) simultaneously, and prefabricated tubular pile (1) inside is full of slurries (4) simultaneously.Slurries parameter mainly comprises the match ratio of slurries, water/binder ratio.First the slip casting of the solid stake of slurry will make slurries riddle the space of aggregate in hole, so that fixed pile.Secondly a part of slurries soil body diffusion towards periphery, carries out grouting and reinforcing to pile peripheral earth, improves the intensity of natural ground soil.Can control slip casting process with grouting amount.
The 7th step, removes seal cover pile.

Claims (4)

1. a hollow stiffness-core slurry-solidified discrete material pile, its technical characterictic is: pile body periphery is slurry-solidified discrete material pile, pile body center is minor diameter prefabricated concrete pipe pile, prefabricated concrete pipe pile pile lining leaves injected hole, and slurries enter discrete material by hole and injected hole in the middle of hollow concrete pile; Periphery discrete material is by the cementing entirety that is frozen into of cement paste; Slurries infiltrate pile peripheral earth under grouting pressure effect, improve all native intensity of stake; Slurries fill up the hole in the middle of concrete pile simultaneously; Described prefabricated concrete pipe pile external diameter is 200 ~ 300 mm, and wall thickness is 50 ~ 100 mm, on pile lining longitudinal section, leaves injected hole every 0.2 ~ 0.5 m, and injected hole adopts quincunx being interspersed; In the time that stake is long, prefabricated tubular pile adopts multistage to be formed by connecting, and connected mode is chosen bolt and connected.
2. a kind of hollow stiffness-core slurry-solidified discrete material pile according to claim 1, is characterized in that: seal cover is installed at prefabricated concrete pipe pile top.
3. a kind of hollow stiffness-core slurry-solidified discrete material pile according to claim 1, is characterized in that: the discrete material that pile body is filled can be rubble, sand, can be also building pigment rubbish or discarded slag.
4. the construction method of a kind of hollow stiffness-core slurry-solidified discrete material pile according to claim 1, comprises following technical step:
(1) rig enters ground to projected depth pile hole, and stake adopts mud off in hole;
(2) in stake hole, put into pile lining and leave the minor diameter prefabricated concrete pipe pile of injected hole, in the time that pile tube is multistage, put into for rear one section one section with bolts;
(3) seal cover is installed at pile tube top, seal cover is connected with grouting pump by flexible pipe;
(4) inject clear water hole flushing by the hole of pile tube pile lining;
(5) in stake hole, drop into discrete material;
(6) in stake hole, inject slurries by the hole of pile tube pile lining by grouting pump;
(7) the fixed rear pile of slurries and aggregate penetrating in pile peripheral earth is full of the cavity of pile tube inside simultaneously.
CN201110341205.2A 2011-11-02 2011-11-02 Hollow stiffness-core slurry-solidified discrete material pile and construction method thereof Active CN102505684B (en)

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CN105064332A (en) * 2015-07-14 2015-11-18 王继忠 Construction method for bearing base piles of square pile bodies
CN106545008A (en) * 2015-09-17 2017-03-29 江苏远卓地下工程技术有限公司 A kind of cast-in-situ bored pile pile making method
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CN106592570B (en) * 2016-12-02 2019-02-15 中冶沈勘工程技术有限公司 A kind of basement process technique using prefabricated compacted sections tailings reinforcing body
CN106703024B (en) * 2017-01-18 2020-02-28 安徽省经工建设集团有限公司 Construction process of slurry-solidified gravel composite pile
CN107059791A (en) * 2017-05-24 2017-08-18 山东大学 A kind of slag core concrete is for anti-stone and preparation method
CN107447754A (en) * 2017-08-24 2017-12-08 天津港航工程有限公司 The new plant stake technique of prefabricated tubular pile and the pile body formed
CN110004907A (en) * 2019-03-27 2019-07-12 河海大学 Miniature steel pipe pile-immersed tube sand-gravel pile joint foundation stabilization construction method and its structure
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CN111074883A (en) * 2020-02-25 2020-04-28 周同和 Post-grouting permeable concrete pipe pile and construction method thereof
CN113293754A (en) * 2021-06-04 2021-08-24 华中科技大学 Slurry-solidified gravel-soil pile suitable for under-solidified soft soil foundation and reinforcing method

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