CN107246006B - The pile-filling method of concrete-pile - Google Patents

The pile-filling method of concrete-pile Download PDF

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Publication number
CN107246006B
CN107246006B CN201710516101.8A CN201710516101A CN107246006B CN 107246006 B CN107246006 B CN 107246006B CN 201710516101 A CN201710516101 A CN 201710516101A CN 107246006 B CN107246006 B CN 107246006B
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reinforcement cage
steel reinforcement
concrete
pile
ring
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CN201710516101.8A
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CN107246006A (en
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罗建斌
成艺
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Shenzhen Shekou Investment Harbor Engineering Co Ltd
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Shenzhen Shekou Investment Harbor Engineering Co Ltd
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    • 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
    • E02D5/34Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E02D5/36Concrete or concrete-like piles cast in position ; Apparatus for making same making without use of mouldpipes or other moulds
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D15/00Handling building or like materials for hydraulic engineering or foundations
    • E02D15/02Handling of bulk concrete specially for foundation or hydraulic engineering purposes
    • E02D15/04Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts

Abstract

The invention discloses a kind of concrete-pile reinforcement cage structure and pile-filling methods, it is intended to provide a kind of when karst or the area containing liquid-plastic state mud are irrigated pile driving construction, with can prevent concrete flow into solution cavity, reduce concrete waste, or collapse hole is avoided to happen, the concrete-pile reinforcement cage structure and pile-filling method for the advantages of promoting concrete-pile quality, its key points of the technical solution are that, steel reinforcement cage steel reinforcement cage steel reinforcement cage on the outside of steel reinforcement cage corresponds to solution cavity or the position of current-formed silt layer is fixed with the ring-shaped baffle made of iron sheet, ring-shaped baffle is fixed on outside steel reinforcement cage by the dowel being fixed on stirrup, several blocks are equipped between ring-shaped baffle and steel reinforcement cage, ring-shaped baffle can cover solution cavity and hole, concrete is avoided to enter in solution cavity, it can make concrete directly according to the shape formable of stake holes, reduce coagulation The waste of soil reduces the generation that sandstone is mixed into the situation in concrete-pile, the quality after promoting concrete-pile forming.

Description

The pile-filling method of concrete-pile
Technical field
The present invention relates to construction process field, in particular to a kind of pile-filling method of concrete-pile.
Background technique
Modern architecture industry, ground and stake are to build mostly important one of part the most, and concrete-pile is to use concrete Stake made of (including ordinary reinforced concrete, prestressed concrete) has and saves timber and steel, durable, low cost The advantages that honest and clean, is widely used in the foundation engineering of waterwork, industrial building, civil buildings and bridge, is also commonly used for side slope And antiskid or the water proof of pattern foundation pit supporting structure.
There are rectangular, rectangle, circle and annular etc. in the section of stake, and the most commonly used is square-section stake and ring section stake, In When building lays the foundations, builds concrete-pile, stake holes is generally first accomplished fluently, then prefabricated steel reinforcement cage is put into stake holes, and pours Concrete is filled, forms concrete-pile after it coagulates reality, stake holes is adapted to steel reinforcement cage, when ground soil property is more soft, is easy Sediment is formed in stake holes, is easy to form body refuse precipitating in concrete-like after filling concrete, present people make in many ways Attempt to solve problems.
Currently, the Chinese patent of Publication No. CN103696417A discloses a kind of cast-in-situ bored pile bottom secondary pile hole cleaning dress It sets and method, it includes nozzle ring, aqueduct, pump, media slot, air compressor machine and air hose.Air hose and aqueduct are along steel reinforcement cage Length direction be fixedly connected on steel reinforcement cage.One end of air hose is connected with the air compressor machine, the other end insertion drilling bottom of air hose Portion.One end of pump is connect with the media slot, and the other end of pump is connect with one end of the aqueduct.The other end of aqueduct with The nozzle ring is connected.Nozzle ring is fixed on the bottom of steel reinforcement cage.
The principle of underwater placing concrete is utilized in this cast-in-situ bored pile bottom secondary pile hole cleaning device and method, removes Most of sediment in stake holes, solves the problems, such as sediment deposition to a certain extent, improves the quality of concrete-pile, still When there is lateral solution cavity, through-hole in soil layer, and when these solution cavities or through-hole intersect with stake holes, the coagulation in filling process Soil can pour into solution cavity or through-hole, and a large amount of concrete is not only needed to fill up solution cavity, cause the waste of concrete, and being also easy to will be molten Sandstone in hole, which is brought into steel reinforcement cage, causes sandstone to precipitate, and influences the quality of piling.
Summary of the invention
A purpose of the invention is to provide a kind of concrete-pile reinforcement cage structure, and having can prevent concrete from flowing into The advantages of solution cavity is squeezed into mud, is reduced concrete waste, is promoted concrete-pile quality.
Above-mentioned technical purpose of the invention has the technical scheme that
A kind of concrete-pile reinforcement cage structure, including straight muscle and stirrup, the straight muscle uniform ring constitute annulus around setting The steel reinforcement cage of shape, stirrup are fastened around outside steel reinforcement cage, and the position of corresponding solution cavity is fixed with made of steel outside steel reinforcement cage Ring-shaped baffle, ring-shaped baffle is fixed on outside steel reinforcement cage by the dowel being fixed on stirrup, between ring-shaped baffle and steel reinforcement cage Equipped with several blocks.
By using above-mentioned technical proposal, during filling stake, need to be arranged among steel reinforcement cage conduit, then by conduit to Concrete, is filled up entire stake holes by stake holes bottom concrete perfusion from the bottom to top, and in steel reinforcement cage is coated on, and if stake holes In there are hole or solution cavity, concrete needs first to fill up solution cavity, on the one hand wastes concrete, on the other hand can be by the sand in solution cavity Stone impurity band goes out hole and is mixed into concrete-pile, the quality after influencing concrete-pile forming.
The ring-shaped baffle being arranged in outside steel reinforcement cage can cover solution cavity and hole, avoid concrete from entering in solution cavity, energy So that concrete directly according to the shape formable of stake holes, is reduced the waste of concrete, reduces sandstone and be mixed into the feelings in concrete-pile The generation of condition, the quality after promoting concrete-pile forming.
Further setting: the block is equipped with several around the center line of steel reinforcement cage, and dowel penetrates block setting simultaneously It is fixed on ring-shaped baffle.
By using above-mentioned technical proposal, the effect of block is to separate steel reinforcement cage and ring-shaped baffle, enables concrete By the gap between steel reinforcement cage and ring-shaped baffle, steel reinforcement cage is coated in concrete completely, to promote entire concrete-pile Quality and solid degree.
Further setting: three reinforcing ribs, reinforcing rib shape triangular in shape in steel reinforcement cage are fixed in the steel reinforcement cage Connection, reinforcing rib both ends are each attached on stirrup.
By using above-mentioned technical proposal, since steel reinforcement cage is annularly arranged, stirrup is integrally rounded, and reinforcing rib is arranged to It is triangular shaped, using the relatively stable feature of triangle, makes steel reinforcement cage is whole to keep relatively firm state with stirrup, avoid Deformation occurs in process and influences the casting of concrete-pile.
Further setting: the width of the ring-shaped baffle is greater than the diameter at solution cavity hole in soil layer, the thickness of ring-shaped baffle Degree is between 3~5mm.
By using above-mentioned technical proposal, the degree of seeing of ring-shaped baffle is greater than the diameter at solution cavity hole, such ring-shaped baffle energy It is enough effectively to block solution cavity, avoid concrete from entering in solution cavity, and the thickness of ring-shaped baffle is maintained between 3~5mm, Ke Yijin Material may be saved, overall weight is reduced.
It is a further object of the present invention to provide a kind of pile-filling methods of concrete-pile, and having can prevent concrete from flowing into The advantages of solution cavity reduces concrete waste, promotes concrete-pile quality.
Above-mentioned technical purpose of the invention has the technical scheme that
A kind of pile-filling method of concrete-pile, comprising the following steps:
S1: preparation of construction starts levelling of the land after choosing suitable drilling machine, the survey of stake position is carried out on the basis of four-way one is flat Setting-out, production and embedded casing are measured, the modulation of mud stock and the setting of mud circulating system are completed;
S2: drilling borehole cleaning selects the rotary drilling rig drilling of heavy machine lock drilling rod, is constructed simultaneously by the determining parameter of construction The parameter for situations such as record is as added drilling rod, drilling depth, geologic feature, mechanical damage, barrier, solution cavity position, drilling To after design hole depth, slurry adjustment is changed in completion, and uses gas lift method borehole cleaning in bottom hole using cleanout bit, and sediment is removed in fishing;
S3: the processing and storage of steel reinforcement cage, steel reinforcement cage are disposably made of the mould method of forming in fabricating yard, are measured molten Stationary ring baffle on the position in hole, ring-shaped baffle and the welding protective layer on the outside of steel reinforcement cage, protective layer it is vertical every along drilling Together every 2m setting, per pass is circumferentially symmetrically arranged 4, and steel reinforcement cage is placed on the contour lumps of wood and stores, and keeps storage pad The smooth and drying on ground;
S4: installation steel reinforcement cage is lifted by crane using two o'clock and slings steel reinforcement cage, and alignment aperture keeps vertical slow play to enter hole, is avoided Swiveling Rebar cage makes its pendulum impact side wall, and steel reinforcement cage is positioned, ring-shaped baffle is directed at and covers solution cavity hole, and 6 The casting that concrete is completed in hour, prevents the hole that collapses;
S5: secondary clear bottom after steel reinforcement cage is divided into, needs to survey heavy silt value using ungauged regions hydrology lining rope, standard plummet, The stake holes to runaway needs to make secondary clear bottom, and secondary clear bottom uses gas lift method, divides into casting conduit after qualified immediately Carry out underwater gliders;
S6: selecting round screw thread quick coupling conduit, terminates depositing funnel thereon, and by under crane or drilling machine suspention successively Put conduit, when decentralization avoids collision steel reinforcement cage, guarantees perpendicularity deviation≤0.5% of conduit, hammers conduit to meeting using pile monkey The pile sinking absolute altitude of design requirement checks in conduit that concrete fills tube drawing after conduit, often without casting concrete after mud or water inlet The secondary height that pours is less than 1.5m, and repeated several times, which are poured, to be completed to fill stake with tube drawing process.
Further setting: the effect of mud is retaining wall, takes sand casting, cuts soil lubrication, cooling drill bit etc., wherein being with retaining wall It is main, the drying and cleaning in stake holes should be kept, therefore after drilling reaches design requirement depth and qualification on inspection, need Borehole cleaning is carried out immediately, it is therefore an objective to which cleaning hole bottom sediment improves bearing capacity, it is ensured that pile foundation quality to reduce the settling amount of pile foundation.
After borehole cleaning, the mud of discharge or extraction in device to hole, touching twirl with hand should feel without coarse grain, before casting concrete, hole Bottom sediment allows thickness to comply with standard regulation, to guarantee to fill the quality of stake finished product.
For avalanche prevention hole, steel reinforcement cage, casting concrete should be placed after borehole cleaning immediately, steel reinforcement cage generally makes in building site, production Shi Yaoqiu main reinforcement circumferential direction is evenly arranged, and stirrup diameter and spacing, the spacing of main reinforcement protective layer, hoop of putting more energy into etc., which should all meet design, to be wanted It asks, dress is when hanging steel reinforcement cage, and the rotation for avoiding steel reinforcement cage and touching hole wall are also for preventing more sandstone impurity effects The Forming Quality of concrete-pile.
Further setting: casing is made of the steel plate of 5~8mm in the S1, and internal diameter is 1.20~1.40 meters, height 1.70 meters, bottom is embedded in lower 1.5 meters of earth's surface, and 0.2 meter above ground level of casing top opens up 1~2 overflow hole on casing.
By using above-mentioned technical proposal, the effect of casing is that spud pile hole site prevents the surface water from flowing into, protection hole Mouthful, to increase stake holes internal water pressure, prevents collapse hole, guidance drill bit direction etc., casing is embedded in lower 1.5 meters of earth's surface when pore-forming, 0.2 meter above ground level of casing top can form protection and guidance in drilling, and drilling machine is enable to be bored along fixed route Hole.
Further it is arranged, in the S2, reaches lithosphere if rotary drilling rig drills, percussive drill can be used to lithosphere Continue to drill, until projected depth, mud face should be not less than lower 1.0 meters of aperture in hole when borehole cleaning, and be higher by level of ground water 1.0~1.5 meters or more.
By using above-mentioned technical proposal, rotary drilling rig can bore open soil layer, form preliminary hole, and lithosphere needs Impact drill is used to be operated, to prevent Sun Hua rotary drilling rig.
In conclusion the invention has the following advantages:
Ring-shaped baffle can cover solution cavity and hole, and concrete be avoided to enter in solution cavity, can make concrete directly by The shape formable of stake holes, reduce the waste of concrete, reduce the generation that sandstone is mixed into the situation in concrete-pile, promote coagulation Quality after native stake forming.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of embodiment 1;
Fig. 2 is the top view of embodiment 1.
In figure, 1, steel reinforcement cage;11, straight muscle;12, stirrup;13, dowel;2, ring-shaped baffle;3, block;4, reinforcing rib.
Specific embodiment
Below in conjunction with attached drawing, invention is further described in detail.
Embodiment 1: a kind of concrete-pile reinforcement cage structure, as shown in Figure 1, including several perpendicular to ground setting Straight muscle 11, circumferentially shape constitutes the steel reinforcement cage 1 of cylindrical shape around setting to diameter, and annulus shape setting is fixed with outside steel reinforcement cage 1 Stirrup 12, the diameter of stirrup 12 is identical as the diameter of straight muscle 11, and stirrup 12 tively firm fixes entire steel reinforcement cage 1, To keep the stability of entire steel reinforcement cage 1.
As depicted in figs. 1 and 2, the middle position of steel reinforcement cage 1 is equipped with ring-shaped baffle 2, and whole ring-shaped baffle 2 is in circular ring shape Shape, and be set in outside steel reinforcement cage 1, ring-shaped baffle 2 is fixed on stirrup 12 by dowel 13, is fixed with several outside stirrup 12 Block 3, block 3 are provided with 6 around the center line of steel reinforcement cage 1, and ring-shaped baffle 2 is made of steel, thickness 3~5mm it Between.
It is arranged and is fixed on the ring-shaped baffle 2 in outside as shown in Fig. 2, dowel 13 penetrates block 3, dowel 13 will Ring-shaped baffle 2, steel reinforcement cage 1 and block 3 are fixed together, and can leave between steel reinforcement cage 1 and ring-shaped baffle 2 so cricoid Gap, when concrete perfusion, concrete can be discharged from gap.
As shown in Fig. 2, being fixed with three reinforcing ribs 4 in the circular space that steel reinforcement cage 1 is formed, whole reinforcing rib 4 is in positive three Angular shape setting, the both ends of reinforcing rib 4 are fixed on the position of stirrup 12, the overall structure equilateral triangle of reinforcing rib 4, due to triangle The structure of shape is the most stable, and three reinforcing ribs 4 can give steel reinforcement cage 1 stronger support, so that guaranteeing that steel reinforcement cage 1 is whole has Stronger stability.
A kind of embodiment 2: pile-filling method of concrete-pile, comprising the following steps:
Step 1: preparation of construction, starts levelling of the land after choosing suitable drilling machine, stake position is carried out on the basis of four-way one is flat Surveying and locating, production and embedded casing, complete the modulation of mud stock and the setting of mud circulating system, casing using 5~ The steel plate of 8mm is made, and internal diameter is 1.20~1.40 meters, and 1.70 meters of height, bottom is embedded in lower 1.5 meters of earth's surface, casing 0.2 meter above ground level is pushed up, 1~2 overflow hole is opened up on casing.
Step 2: drilling borehole cleaning, selects the rotary drilling rig drilling of heavy machine lock drilling rod, is applied by the determining parameter of construction Work and the parameter for recording situations such as such as adding drilling rod, drilling depth, geologic feature, mechanical damage, barrier, solution cavity position, After being bored into design hole depth, slurry adjustment is changed in completion, and uses gas lift method borehole cleaning in bottom hole using cleanout bit, and sediment is removed in fishing, such as The drilling of fruit rotary drilling rig reaches lithosphere, and percussive drill can be used and continue to drill to lithosphere, until projected depth, clearly Mud face should be not less than lower 1.0 meters of aperture in Kong Shikong, and be higher by 1.0~1.5 meters of level of ground water or more.
Step 3: the processing and storage of steel reinforcement cage, use embodiment 1 as the matrix of concrete-pile, the steel in embodiment 1 Muscle cage is disposably made in fabricating yard of the mould method of forming, measures stationary ring baffle on the position of solution cavity, ring-shaped baffle And the welding protective layer on the outside of steel reinforcement cage, protective layer along drilling vertically every 2m setting together, per pass is circumferentially symmetrically set 4 are set, steel reinforcement cage is placed on the contour lumps of wood and stores, and keeps the smooth of storage space and drying.
Step 4: installation steel reinforcement cage, is lifted by crane using two o'clock and sling steel reinforcement cage, alignment aperture keeps vertical slow play to enter hole, It avoids Swiveling Rebar cage or makes its pendulum impact side wall, steel reinforcement cage is positioned, be directed at ring-shaped baffle and cover solution cavity hole, and The casting that concrete is completed in 6 hours, prevents the hole that collapses.
Step 5: secondary clear bottom, after steel reinforcement cage is divided into, it is heavy to need to survey using ungauged regions hydrology lining rope, standard plummet Silt value, the stake holes to runaway need to make secondary clear bottom, and secondary clear bottom uses gas lift method, divides into casting after qualified immediately Conduit carries out underwater gliders.
Step 6: selecting round screw thread quick coupling conduit, terminate depositing funnel thereon, and by crane or drilling machine suspention according to Secondary decentralization conduit, when decentralization, avoid collision steel reinforcement cage, guarantee perpendicularity deviation≤0.5% of conduit, extremely using pile monkey hammering conduit Meet the pile sinking absolute altitude of design requirement, checks in conduit that concrete pulls out after filling conduit without casting concrete after mud or water inlet Pipe pours height every time and is less than 1.5m, and repeated several times, which are poured, to be completed to fill stake with tube drawing process.
The above embodiments are only explanation of the invention, are not limitation of the present invention, those skilled in the art Member can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as at this All by the protection of Patent Law in the scope of the claims of invention.

Claims (3)

1. a kind of pile-filling method of concrete-pile, which comprises the following steps:
S1: preparation of construction starts levelling of the land after choosing suitable drilling machine, and the measurement that stake position is carried out on the basis of four-way one is flat is put Sample, production and embedded casing complete the modulation of mud stock and the setting of mud circulating system;
S2: drilling borehole cleaning selects the rotary drilling rig drilling of heavy machine lock drilling rod, constructs by the determining parameter of construction, and remember It records following parameter: adding drilling rod, drilling depth, geologic feature, mechanical damage, barrier and solution cavity position, be bored into design After hole depth, slurry adjustment is changed in completion, and uses gas lift method borehole cleaning in bottom hole using cleanout bit, and sediment is removed in fishing;
S3: the processing and storage of steel reinforcement cage, steel reinforcement cage are disposably made in fabricating yard of the mould method of forming, measure solution cavity Stationary ring baffle (2) on position, ring-shaped baffle (2) and the welding protective layer on the outside of steel reinforcement cage, protective layer it is vertical along drilling Together every 2m setting, per pass is circumferentially symmetrically arranged 4, and steel reinforcement cage is placed on the contour lumps of wood and stores, and keeps storing The smooth and drying in place;The steel reinforcement cage includes straight muscle (11) and stirrup (12), and straight muscle (11) uniform ring is around setting, structure At the steel reinforcement cage (1) of annulus shape, stirrup (12) is fastened around steel reinforcement cage (1) outside, and steel reinforcement cage (1) corresponds to the position of solution cavity outside It is fixed with the ring-shaped baffle made of iron sheet (2), ring-shaped baffle (2) is fixed by the dowel (13) being fixed on stirrup (12) Steel reinforcement cage (1) outside, between ring-shaped baffle (2) and steel reinforcement cage (1) be equipped with several blocks (3);The block (3) is around reinforcing bar The center line of cage (1) is equipped with several, and dowel (13) penetrates block (3) and is arranged and is fixed on ring-shaped baffle (2);The steel Three reinforcing ribs (4), reinforcing rib (4) shape connection triangular in shape, reinforcing rib (4) in steel reinforcement cage (1) are fixed in muscle cage (1) Both ends are each attached on stirrup (12);The width of the ring-shaped baffle (2) is greater than the diameter at solution cavity hole in soil layer, ring-type gear The thickness of plate (2) is between 3~5mm;
S4: installation steel reinforcement cage is lifted by crane using two o'clock and slings steel reinforcement cage, and alignment aperture keeps vertical slow play to enter hole, avoids rotating Steel reinforcement cage makes its pendulum impact side wall, and steel reinforcement cage is positioned, and is directed at ring-shaped baffle and covers solution cavity hole, and at 6 hours The interior casting for completing concrete, prevents the hole that collapses;
S5: secondary clear bottom after steel reinforcement cage is divided into, needs to survey heavy silt value using ungauged regions hydrology lining rope, standard plummet, exceed The stake holes of control range needs to make secondary clear bottom, and secondary clear bottom uses gas lift method, divides into casting conduit after qualified immediately and carries out Underwater gliders;
S6: selecting round screw thread quick coupling conduit, terminates depositing funnel thereon, and successively decentralization is led by crane or drilling machine suspention Pipe, when decentralization, avoid collision steel reinforcement cage, guarantee perpendicularity deviation≤0.5% of conduit, hammer conduit to meeting design using pile monkey It is required that pile sinking absolute altitude, check conduit in without casting concrete after mud or water inlet, concrete is filled tube drawing after conduit, is poured every time It builds height and is less than 1.5m, repeated several times, which are poured, to be completed to fill stake with tube drawing process.
2. the pile-filling method of concrete-pile according to claim 1, it is characterised in that: casing uses 5~8mm in the S1 Steel plate be made, internal diameter be 1.20~1.40 meters, height 1.70 meters, bottom is embedded in lower 1.5 meters of earth's surface, and casing is risen 0.2 meter of ground out opens up 1~2 overflow hole on casing.
3. the pile-filling method of concrete-pile according to claim 2, it is characterised in that: in the S2, such as churning driven machine drill Hole reaches lithosphere, and percussive drill can be used and continue to drill to lithosphere, until projected depth, mud in hole when borehole cleaning Face should be not less than lower 1.0 meters of aperture, and be higher by 1.0~1.5 meters of level of ground water or more.
CN201710516101.8A 2017-06-29 2017-06-29 The pile-filling method of concrete-pile Active CN107246006B (en)

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111042176A (en) * 2019-12-14 2020-04-21 中冶天工集团有限公司 Device for rapidly processing rotary excavation pile foundation karst cave and using method thereof
CN111236251A (en) * 2020-01-19 2020-06-05 中国十七冶集团有限公司 Underground continuous wall construction method for underground loose soil layer
CN111622216A (en) * 2020-06-05 2020-09-04 成都建工集团有限公司 Construction method of pile foundation joist weighing type retaining wall

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CN104153352A (en) * 2014-07-31 2014-11-19 广西科技大学 Karst geology rotary-drilling bored concrete pile hole forming process
CN205046551U (en) * 2015-09-29 2016-02-24 昆明捷程桩工有限责任公司 Solution cavity district sleeve pipe bored concrete pile
CN106759288A (en) * 2016-11-29 2017-05-31 昆山顶牛市政建设有限公司 One kind building bored pile construction method

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CN103122632A (en) * 2013-02-06 2013-05-29 中冶沈勘工程技术有限公司 Construction method for drilling hole and casting pile in plastic flow stratum or karst cave stratum
CN103132509A (en) * 2013-03-01 2013-06-05 中天建设集团有限公司 Bored pile construction process
CN104153352A (en) * 2014-07-31 2014-11-19 广西科技大学 Karst geology rotary-drilling bored concrete pile hole forming process
CN205046551U (en) * 2015-09-29 2016-02-24 昆明捷程桩工有限责任公司 Solution cavity district sleeve pipe bored concrete pile
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