CN101153491A - Borehole wall-protection back cover and method for manufacturing large diameter hollow concrete pile - Google Patents

Borehole wall-protection back cover and method for manufacturing large diameter hollow concrete pile Download PDF

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Publication number
CN101153491A
CN101153491A CNA2006101419395A CN200610141939A CN101153491A CN 101153491 A CN101153491 A CN 101153491A CN A2006101419395 A CNA2006101419395 A CN A2006101419395A CN 200610141939 A CN200610141939 A CN 200610141939A CN 101153491 A CN101153491 A CN 101153491A
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pile
hole
concrete
coxopodite
base
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CN100554597C (en
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陶义
石午江
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石午江
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Abstract

A method of drilling large-caliber deep hole with encasing and sealed bottom and making major-diameter hollow pile is like that: two concrete pile casings and a base section with a plurality of extending sections are adopted in the method, wherein, the lower end of the base section is provided with an endocone-shaped cutting edge, the lower end of each extending section is provide with a preset positioning connecting ring, and the upper ends of the base section and the extending sections are also provided with preset connecting rings. The base section is arranged at a hole site and is fixed by a pile casing pressure device, a drilling tool is used to take soil from the hole of the base section and at the same time the pile casing pressure device is used to force the base section to sink, when the sinking distance of the base section is equal to the height of an extending section, the upper end face of the base section is spread with cement grout, and then an extending section is added and is welded together with the base section. The process of soil taking, forcing to sink, cement grout spreading and new extending section adding is repeated continually until the base section sinks to an intended depth, and then concrete is injected into the hole bottom via a duct to seal the hole bottom, thereby making a concrete deep well which is completely sealed on the hole wall and hole bottom and is capable of exhausting water in the hole. If the concrete pile casings are provided with prestressed reinforcements according to the requirements of high-strength pile body and a grout jacking pipe is buried in advance, the hollow concrete pile which enables grouting on the pile base and the soil horizon around the pile can also be made. The pile saves material and gives full play to end bearing and lateral friction resistance with high strength, and hole drilling and pile making can be achieved synchronously.

Description

A kind of borehole wall-protection back cover and the method for manufacturing large diameter hollow concrete pile
Technical field
The present invention relates to a kind of job practices, the retaining wall method of water and adopt this method to manufacture large diameter hollow concrete pile in the back cover drain hole then when being a kind of drilling deep hole specifically.
Background technology
Rotary drilling rig or title " revolution bucket rig ", " A Siteli (Earth Drill) rig " have become the important pore-forming equipment of heavy caliber deep hole construction in recent years.It is that " drill machine with casing " or title " Bei Nuote (Benoto) shakes the pipe bit machine " and " mud direct and reverse circulation drilling machine " are compared with other two kinds of still widely used at present heavy caliber pore-forming equipments, has some remarkable advantages: shake the light and handy low price efficient height flexibly of pipe bit machine than Bei Nuote; The alkaline mud of the contaminated environment that produces during than tens of times of mud direct and reverse circulation drilling machine speed of application height and construction also lacks a lot.But the dried pore-forming operation in the still holes that are used to be difficult for to collapse of this efficient pore-forming equipment rotary drilling rig at present more.In the hole soil layer that easily collapses, it can be used the sleeve pipe retaining wall but seldom adopt, because its used sleeve pipe is very difficult to transfer to.When haveing no alternative but to adopt " stabilizing solution " to be the alkaline mud retaining wall, to carry native mud up and down often unreliable by vigorous agitation retaining wall effect because of revolution bucket again.Particularly run into quicksand, the boulder bed in the hole of easily collapsing, rotary digging drilling hole sometimes even disabled.This also is that the also relatively cheap rotary drilling rig of high efficient and flexible price still can't replace the main cause that heavy expensive Bei Nuote shakes the pipe bit machine so far.
Along with country to the environmental protection requirement increasingly stringent, have a lot of coal-burning boilers coal-burning power plant will change the burning natural gas.For " probably anti-" need suitably strengthen air storage steel cylinder diameter and will make the air storage amount become quadratic relationship to increase with natural gas storage in assign more than 50 meter withstand voltage steel cylinder now buriedly.But how that large diameter steel cylinder is buried in underground a difficult problem is.At first need the drill large-caliber deep hole, boring is not difficult, and above-mentioned several existing hole forming methods can be finished.But placing steel cylinder in deep hole but is not easy: with above-mentioned revolve dig, Bei Nuote shakes hole that the just reverse circulating method of pipe, mud comes outbreak out all can't back cover, not back cover just can't tap in water or mud, it is very difficult to place the air storage steel cylinder in the deep hole that is full of water or mud.Can only select not have the place that underground water or depth desired have impervious layer just so adopt existing hole forming method boring to build underground air storage storehouse.But often there is not this condition near the coal-burning power plant that has built up.
When adopting above-mentioned various existing hole forming method to manufacture concrete filling pile, made major diameter concrete stake is solid cylinder without exception all, and it is very considerable to conduct oneself with dignity.The application of minor diameter pre-stress hollow pile tube in recent years obtains promoting.Get on if we also are applied to the stake of major diameter concrete with prestressing force and hollow these two technology, its benefit will be very huge.Simple once knowing: the stake more than the diameter 1m changes the hollow building materials consumption that reduces at least into more than 60% by solid, and the application of prestressing technique will make the use of building materials more reasonable.The cement iron and steel all is the rich and influential family of high energy consumption, heavily contaminated in the building materials production.Save with rationally using the meaning of building materials and not only be to have reduced building costs, the more important thing is the protection that helps ecological environment.
Summary of the invention
The technical problem to be solved in the present invention is: a kind of simple and easy reliable feasible low-cost method is provided, hole and this deep hole hole underseal can being closed behind pore-forming guarantees when making rig drill large-caliber deep hole not collapse, water in the tap is made totally enclosed concrete deep-well or hollow large diameter hollow concrete pile at the bottom of the hole wall hole.
The scheme that the present invention solves the problems of the technologies described above is: the method for a kind of borehole wall-protection back cover system stake, be provided with rig and internal diameter prefabricated concrete casing greater than the drilling tool diameter, it is characterized in that: prefabricated concrete casing is that a coxopodite is joined several continuous joints, there is the pre-buried connecting ring in interior taper cutting edge upper end the coxopodite lower end, the pre-buried ring that is located by connecting in continuous joint pre-buried connecting ring lower end, upper end, coxopodite is placed in bore position and is fixed and re-use drilling tool and drill through soil under in the coxopodite hole with the casing water booster system, exerting pressure by the casing water booster system simultaneously forces coxopodite to sink, smearing cement mortar in the coxopodite upper surface when deflection reaches a continuous joint height adds a continuous joint again and by two internode connecting rings their welderings is one, repeating to drill through under above-mentioned soil exerts pressure simultaneously and forces casing to sink, add new continuous joint after smearing cement mortar, continue the process of exerting pressure and fetching earth after being weldingly connected again, sink to desired depth up to coxopodite, downcomer perfusion concrete back cover at the bottom of the hole again uses water in the submersible pump tap after the concrete strength for the treatment of back cover reaches requirement.We just make concrete deep-well or the hollow concrete pile of emptied of water in the hole wall hole underseal closed pore like this.
Description of drawings
Below we illustrate shape, structure and the operating principle of the coxopodite of the prefabricated casing of said concrete among the present invention, continuous joint and casing water booster system and how to use their retaining wall back covers and the system stake by accompanying drawing.
Fig. 1 is a retaining wall operating principle schematic diagram of the present invention.For being only to be used for the retaining wall back cover shown in the simple and clear figure not as the prefabricated concrete casing and the simplest a kind of oil cylinder type casing water booster system of stake.The local thin portion structure of amplifying the expression platen in the upper left corner among the figure, the lower right corner are the schematic diagrames of two joint casing junction structures.
Fig. 2 is the prefabricated concrete casing structure that the present invention is used for totally enclosed concrete deep-well at the bottom of the hole wall hole.
Among the figure (a): be that coxopodite adds shape and the structure that the continuous joint of a joint links together.
(b): be an independent continuous joint structure.
Fig. 3 is the present invention's structure as the prefabricated reinforced concrete casing of pile body when being used to manufacture large diameter hollow concrete pile; because of itself and concrete casing profile shown in Figure 2 basic identical; for the cement mortar protective course that more clearlys show prestressed reinforcement that it increases as pile body and madjack pipe and add for ferrous materials in the protection pile body or the like thin portion structure, all adopt partial sectional view.
Among the figure (a): the structure of representing any one continuous joint lower end.
(b): the interior taper cutting edge structure of representing end structure on any one continuous joint or the coxopodite and coxopodite lower end.
(c): represent the effect of any two joints as junction structure and pressure injection cement paste between the concrete casing of pile body.
(d): represent a tee junction structure that is used to connect two internode madjack pipes.
Among the figure: 1. casing platen, 2. rotary drilling rig telescopic drill rod, 3. oil cylinder Assembly of pin, 4. the oil cylinder of exerting pressure, the continuous joint of 5. prefabricated concrete casing, 6. casing water booster system counterweight, 7. the pre-buried ring that is located by connecting of the continuous joint of prefabricated concrete casing lower end, the pre-buried connecting ring in 8. prefabricated concrete casing upper end.9. the plug welding hole (plug welding is represented in blacking) on the pre-buried ring that is located by connecting in continuous joint lower end; 10. the rig revolution struggles against; 11. prefabricated concrete casing coxopodite; 12. the casing centring ring of casing water booster system; 13. casing water booster system underframe; 14. the platen pad, (damaged tire is made) 15. platen locating pieces (6 are uniform along periphery), guard ring in 16. coxopodites; 17. the pre-buried cutting edge of coxopodite; 18. pile body prestressing force master muscle, the muscle of 19. welding stretch-draw circles and connecting ring, 20. stretch-draw circles; 21. pre-buried madjack pipe; 22. stirrup or spiral are around muscle in the pile body, 23. are put on the cement fine sand slurry of every joint concrete casing upper surface, outlet pipe at the bottom of the 24. coxopodite holes; 25. the water under high pressure mud of infiltration in pile soil horizon; 26. be filled in the cement mortar of two joint joint protection connecting ring ferrous materials, the outlet pipe of 27. madjack pipe tee junctions, 28. madjack pipe tee junctions.
The specific embodiment
How totally enclosed concrete deep-well is finished at the bottom of at first by Fig. 1 a hole wall hole being described:
On the position of boring, lay coxopodite 11, the coxopodite upper surface spread add again behind the cement fine sand slurry a continuous joint 5 (if the coxopodite height be equivalent to the oil cylinder height add when a continuous joint is high then only lay coxopodite get final product) by the plug welding hole 9 places plug welding that encircles on 7 that is located by connecting of continuous joint lower end they are coupled together.
Lay the casing water booster system.Shown in Fig. 1 is the simplest oil cylinder type of a kind of structure casing water booster system, provides power by a small-sized hydraulic station.Its platen 1 and two oil cylinder 4 underframe 13 all are dismountable.Counterweight 6 can adopt ingot iron, also available concrete cast-in-site, even available sand pocket.(when concrete casing height is big, can adopt gland to move up and down the chain-type casing water booster system of guide rail, structure is complicated but its effect that forces casing to sink is identical, so locate not do to go through.) fall platen 1 and slightly exert pressure, use in the coxopodite hole to revolve and dig the revolution bucket and drill through soil down and continue to exert pressure to the concrete casing simultaneously and force the casing sinking.When treating that the coxopodite deflection reaches a continuous joint height, rise platen 1 and smear cement fine sand slurry in the upper surface of continuous joint 5, lay second continuous joint 5 thereon, the plug welding hole 9 places plug welding on the ring 7 that is located by connecting of the second continuous joint, 5 lower ends couples together two continuous joints.
Constantly proceed said process: drill through down soil and exert pressure simultaneously and force the concrete casing to sink, treat that deflection rises platen when reaching a continuous joint height and smears cement fine sand slurry in continuous joint upper surface, lay be located by connecting in its lower end plug welding hole place's plug welding of ring of new continuous joint again two joints are linked to each other, exerting pressure and fetch earth by platen forces the concrete casing to sink ....Until coxopodite sinks to desired depth.The concrete conduit pours into the concrete back cover under after at the bottom of the measurement inspection eye at the bottom of the hole.Like this, the concrete deep-well that all seals at the bottom of hole wall and the hole has just been finished.Just can lay the natural gas paint storage tank calmly after using submersible pump to pump Kong Zhongshui.
As shown in Figure 2, the general arrangement of reinforcement or a small amount of constructional reinforcement is only arranged not of the prefabricated concrete casing of manufacturing the back cover deep-well.We also can find out from Fig. 2: it is that pre-buried iron ring is welded with a circle reinforcing bar that the inwall of coxopodite 11 has the interior guard ring 16 of several roads coxopodite.The effect of guard ring has two in these several roads: the first is reinforced, and prevents that coxopodite from digging the revolution bucket and frequently carry soil up and down and collide and damage because of revolving.It two is the concrete plug slippages under water pressure that stop back cover.We it can also be seen that from Fig. 2: plug welding hole 9 quantity that continuous joint lower end is located by connecting on the ring 7 are few, generally only have 6 to 10.Role is to prevent to force in the process that casing sinks just in case have two joint casings to be separated in two internodes to sandwich silt particle and influence water sealing effect.6 to 10 stopple weldering processes are very fast, boring in the process of exerting pressure and can finish rapidly down.The plug welding hole gathers into folds many plates after the ring blanking that is located by connecting and is drilled to.The ring that is located by connecting cooperates the requirement that can satisfy water shutoff basically with cement mortar.When less demanding or water percolating capacity is very little when water shutoff, also can reduce concrete casing cost with this with the bar dowel of several root beads on the built-in fitting of continuous joint outer ring, lower end replace being located by connecting ring and connecting ring is reduced to a circle embedded bar.We also can use the pitch caulked joint ointment to replace cement mortar, and anti-seepage effect is better.(but when stake system should not use pitch to replace cement).
We introduce the present invention again and how to manufacture large diameter hollow concrete pile.See earlier each broken section showed among Fig. 3 as pile body the time prefabricated concrete casing structure and Fig. 2 in not the existing together of concrete casing of retaining wall back cover merely:
1. is furnished with reinforcing bar.Its quantity of reinforcement, concrete strength, wall thickness or the like are determined according to the design bearing capacity of stake.The main muscle of representing among Fig. 3 18 is prestressing force master muscle.Therefore the two ends of every joint pile body (being coxopodite and continuous joint) all are provided with stretch-draw circle 20.Stretch-draw circle 20 welds by some muscle 19 and two ends connecting ring 8, the ring 7 that is located by connecting.Each joint is gone up connecting ring 8 and the setting of the ring 7 and the ring 7 top plug welding holes 9 that are located by connecting that is located by connecting, and the tensile strength of its joint is not less than total tensile strength of the interior main muscle 18 of pile body after all must guaranteeing two joints weldering fusing mutually.From Fig. 3 (C) as can be seen: after every joint upper and lower side all was welded into one with adjacent segments, the main muscle in its whole pile body was a continuous overall structure from mechanical structure fully.If its main muscle is not applied prestressing force during the cast-in-site pile body, then can simplified structure: cancellation stretch-draw circle 20 and muscle 19 directly main muscle 18 is welded on connecting ring 8 and the ring 7 that is located by connecting on.
2. pre-buried madjack pipe.Pre-buried several (6~8) madjack pipes (polyvinyl chloride pipe of available semihard) as shown in Figure 3 in every joint pile body.Whenever add and new continuing note madjack pipe position up and down when saving.With two joint welderings connect the back with tee junction 28 or two pass joints (simple in structure draw) up and down madjack pipe 21 connect.Only arrange two to use tee junction in two internodes, the one circle joint, all the other use two pass joints.Selected in advance two madjack pipes are only used two pass joints from top to bottom all the time, and these two are used for stomidium base pressure slurry under the coxopodite.Other madjack pipe threeway two logical arrangements are balanced as far as possible except that these two.The outlet pipe 27 of tee junction and coxopodite outlet pipe 24 in advance with hot sticky method cling (promptly heat the mouth of pipe again with pliers clamp make its sticking with) prevent that mortar and silt particle from entering.Water under high pressure mud will be washed open sealing when treating mud jacking.The effect of water under high pressure mud is that fixed coxopodite bottom is stirred broken soil layer and infiltrated pile soil horizon to improve the end load and the side friction of stake.We are pre-buried madjack pipe in making the concrete casing of pile body only.But under the very big geological conditions of side friction, when running into very thick dust coarse sands layer, sink to the desired degree of depth smoothly for making coxopodite, we also can utilize pre-buried madjack pipe (is not cement paste to hole wall pressure injection mud in work progress! ) reduce the sinking of side friction help casing with mud as sliding agent.
3. protect the ferrous materials of pile body joint with cement mortar.Concrete casing as pile body is the ingredient of building permanent structure, and its ferrous materials must be wrapped in anticorrosion in the concrete.After having represented two joint pile bodies welding among Fig. 3 (C) and having connected madjack pipe in the ring outside dead slot that is located by connecting of joint filling concrete mortar 26 as topping.(the concrete casing that only is used as the retaining wall back cover among Fig. 2 does not have this requirement.)
The longer the better certainly for the length of every joint pile body (being the casing height), but be subjected to the restriction that the Operation of Rotary Pile Drill bucket is lifted from ground.Under the condition that drilling equipment allows, prefabricated coxopodite and continuous joint height should be higher as far as possible to reduce piece-ups.Conscientiously welding can make an intensity not influenced by joint.
We are summarized as follows the operation that the present invention manufactures large diameter hollow concrete pile now:
1. on predetermined stake position, coxopodite 11 is installed.After cement fine sand slurry 23 is smeared in the coxopodite upper surface, lay continuous joint 5 thereon,, be connected two joint joint madjack pipes 21, filling concrete mortar 26 in ring 7 outside dead slots that are located by connecting with two tee junctions 28 with a plurality of two pass joints in the 9 places plug welding of plug welding hole.(be equivalent to the oil cylinder height as the coxopodite height and add continuous joint when high, then only lay coxopodite and get final product)
2. lay the casing water booster system.Falling platen 1 slightly exerts pressure.Use is revolved and is dug revolution bucket and drill through soil down in the coxopodite hole and force the coxopodite sinking by platen 1 pressurization simultaneously.Reach a continuous joint height until deflection.
3. rise platen 1 and add new continuous joint thereon after smearing cement fine sand slurry on the continuous joint end face, plug welding connects madjack pipe, and the filling concrete mortar falls platen and drills through soil under exerting pressure simultaneously in the hole.Constantly repeat above-mentionedly to add new continuous joint, plug welding, connection madjack pipe, filling concrete mortar, fetching earth adds new continuous joint after exerting pressure, smear cement fine sand slurry simultaneously ... the process of .. sinks to desired depth up to coxopodite.
4. downcomer pours into the concrete back cover at the bottom of the hole.
5. mud jacking.By the madjack pipe of going up most continuous joint at the bottom of stake and pile soil horizon high pressure (being not less than 10MPa) pressure injection cement paste.
6. draining backfill.The sand that is got out with water backfill part in the submersible pump tap.A hollow concrete stake is finished at this point.
Adopt the present invention to manufacture large diameter hollow concrete pile and have following remarkable advantage:
1. saving building materials. The large diameter hollow concrete pile of same diameter than solid concrete stake at least Save the concrete consumption more than 60%. And the application of prestressing technique more makes building materials get To reasonably utilizing.
2. improve the bearing capacity of stake. Stake is solid to be changed the hollow weight that alleviates into and increases exactly Bearing capacity. Grouting Technology is used and has been increased substantially again side friction and end Load. Use prestressing force and centrifugal dehydration, steam pressure during the hollow pile body of Prefabricated Concrete The technology such as maintenance can improve strength of the mixing pile several times (bringing up to C80 by C20), High-intensity pile body is conducive to give full play to the end load of supporting course. Have good Supporting course the time stake of the present invention have very high bearing capacity.
3. speed of application is fast.Boring and system stake were once finished when the present invention constructed.The speed of creeping into is exactly the speed of system stake basically, has shortened construction period greatly.
4. there is not the mud contamination environment.The earth that gets out during boring can be backfilling into it in hollow pile body greatly, has alleviated the pressure of outward transport landfill disposal.
The present invention is applicable to various soil layers.Quicksand is being arranged, and its advantage of easily collapsing in the soil layer of hole such as cobble is particularly evident.When running into boulder erratic boulder layer, as long as notice that the reinforcing coxopodite makes it possess enough fastness and just can use towards the grab bucket pore-forming.The present invention breaks through construction forbidden zone in the past for high efficiency pore-forming equipment rotary drilling rig and has made condition.Should be noted that the present invention can only be used for rotary drilling rig, the just reverse circulating rotating disk brill of other pore-forming equipment such as mud, diving brill or the like even a kind of simple and easy auger " cauldron awl " that uses in northwest loess area also can adopt the method for the invention to manufacture hollow concrete pile.And simple and easy auger combines with of the present invention, helps thoroughly to eliminate " hand excavated pile " this very dangerous, system piling method of repeatedly human casualty accident taking place, but still being put into design manual so far because of " with low cost " and being continued by the building site to adopt.

Claims (2)

1. the method for borehole wall-protection back cover system stake, be provided with rig and internal diameter prefabricated concrete casing greater than the drilling tool diameter, it is characterized in that: prefabricated concrete casing is that a coxopodite is joined several continuous joints, there is the pre-buried connecting ring in interior taper cutting edge upper end the coxopodite lower end, the pre-buried ring that is located by connecting in continuous joint pre-buried connecting ring lower end, upper end, coxopodite is placed in bore position and adopts the casing water booster system to be fixed re-use drilling tool and drill through soil under in the coxopodite hole, exerting pressure by the casing water booster system simultaneously forces coxopodite to sink, when deflection reaches a continuous joint height the coxopodite upper surface smear that cement mortar adds a continuous joint again and its lower end is located by connecting ring and coxopodite on the connecting ring company of weldering mutually, repeating to drill through under above-mentioned the scholar exerts pressure simultaneously and forces casing to sink, add new continuous joint after smearing cement mortar, continue the process of exerting pressure and fetching earth after being weldingly connected again, sink to desired depth up to coxopodite, downcomer pours into the concrete back cover at the bottom of the hole again, makes deep-well or hollow concrete pile that hole wall hole underseal closes.
2. as the method for right 1 described a kind of borehole wall-protection back cover system stake, it is characterized in that: said concrete casing when manufacturing the hollow concrete pile pile body is the steel bar concrete casing that is embedded with many madjack pipes, through behind the back cover pile again by these madjack pipes at the bottom of stake and pile soil horizon pressure injection water under high pressure mud.
CNB2006101419395A 2006-09-29 2006-09-29 A kind of borehole wall-protection back cover and the method for manufacturing large diameter hollow concrete pile Expired - Fee Related CN100554597C (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101634146B (en) * 2008-07-24 2011-01-26 邢利奥 Manually digging hole full-steel cylinder-wall protecting construction device for building pile foundation and construction method thereof
CN103422862A (en) * 2013-07-26 2013-12-04 王绍华 Ultra-large hole-diameter drilling shaft drilling method
CN106761764A (en) * 2016-12-27 2017-05-31 山河智能装备股份有限公司 A kind of super-large diameter deep shaft simple shield device and shield method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101634146B (en) * 2008-07-24 2011-01-26 邢利奥 Manually digging hole full-steel cylinder-wall protecting construction device for building pile foundation and construction method thereof
CN103422862A (en) * 2013-07-26 2013-12-04 王绍华 Ultra-large hole-diameter drilling shaft drilling method
CN103422862B (en) * 2013-07-26 2015-08-12 王绍华 Large aperture boring Drilling vertical shaft method
CN106761764A (en) * 2016-12-27 2017-05-31 山河智能装备股份有限公司 A kind of super-large diameter deep shaft simple shield device and shield method
CN106761764B (en) * 2016-12-27 2020-03-10 山河智能装备股份有限公司 Simple shield device and shield method for ultra-large-diameter deep shaft

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