CN106065622A - The double sleeve of the efficient drag reduction of pullout tests stake and pullout tests stake drag reduction method - Google Patents
The double sleeve of the efficient drag reduction of pullout tests stake and pullout tests stake drag reduction method Download PDFInfo
- Publication number
- CN106065622A CN106065622A CN201610568336.7A CN201610568336A CN106065622A CN 106065622 A CN106065622 A CN 106065622A CN 201610568336 A CN201610568336 A CN 201610568336A CN 106065622 A CN106065622 A CN 106065622A
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- Prior art keywords
- sleeve
- drag reduction
- stake
- double
- pullout tests
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000007586 pull-out test Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000002689 soil Substances 0.000 claims abstract description 16
- 230000002093 peripheral effect Effects 0.000 claims abstract description 8
- 230000003068 static effect Effects 0.000 claims abstract description 7
- 238000010276 construction Methods 0.000 claims description 13
- 238000003466 welding Methods 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 239000008393 encapsulating agent Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000002372 labelling Methods 0.000 claims description 6
- 238000003032 molecular docking Methods 0.000 claims description 6
- 239000004568 cement Substances 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 3
- 235000014121 butter Nutrition 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 210000001503 joint Anatomy 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 230000036316 preload Effects 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 230000011218 segmentation Effects 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 230000007306 turnover Effects 0.000 claims description 3
- 239000010913 used oil Substances 0.000 claims description 3
- 230000015271 coagulation Effects 0.000 claims 1
- 238000005345 coagulation Methods 0.000 claims 1
- 238000009434 installation Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/66—Mould-pipes or other moulds
- E02D5/665—Mould-pipes or other moulds for making piles
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D11/00—Methods or apparatus specially adapted for both placing and removing sheet pile bulkheads, piles, or mould-pipes
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The double sleeve of a kind of efficient drag reduction of pullout tests stake and pullout tests stake drag reduction method, it is peripheral that the double sleeve of described drag reduction includes that inner sleeve and outer sleeve, described outer sleeve are set in described inner sleeve, leaves certain gap between the two；Described inner sleeve contacts with the concrete of test pile, and outer sleeve contacts with soil around stake；Insulated column is set between described inside and outside sleeve to control gap and increase stability between double sleeve；Described pullout tests stake drag reduction method includes that the making of the double sleeve of drag reduction and installation, the boring of test pile and cast, loading carry out the steps such as pullout tests.The tongue and groove seal form of described pair of sleeve bottom ensure that not having mud between inside and outside sleeve enters, thus reach the purpose of efficient drag reduction, utilize the present invention, when carrying out the static test of pullout tests stake, finder charge is loaded directly on test pile body, make inner and outer sleeves produce sliding, eliminate the impact of design stake top mark height above soil body side friction.
Description
Technical field
The present invention relates to pile foundation construction field, particularly relate to the double sleeve of a kind of pullout tests stake drag reduction and pullout tests stake
Drag reduction method.
Background technology
For ensureing construction quality, before the construction of important building, construction test should be passed through according to specification and design requirement
Stake checks whether the bearing capacity of the stake under specific place and process condition and settling amount are consistent with design idea, and according to examination
Test result adjusted design parameter.Owing to construction unit considers duration and other factors, test pile is the most all opened at building foundation pit
Carry out before digging design bottom land absolute altitude, thus can exist between practice of construction site elevation at engineering pile design top mark height
One section of soil layer, the existence of this soil layer adds the bearing capacity of test pile, makes the bearing capacity of test pile and settling amount and actual stake
Bearing capacity and settling amount there is certain error, therefore, the frictional resistance of this section of soil layer should be eliminated by technical measures and obtain
The design frictional resistance of design engineering pile and settling amount.
The known technical measures eliminating test pile frictional resistance are by an equal diameter of constructing separately, a length of invalid soil
The pullout tests stake of layer depth and corresponding piled anchor, calculate this section of soil layer by this root pullout tests stake is carried out pullout tests
Resistance to compression frictional resistance, this way has the disadvantage that 1, need to increase test pile quantity, increases operating expenses；2 invalid soil depths
Frictional resistance be estimated value, make test data still suffer from certain error.Although the most also it has been proposed that use double sleeve technology
Reduce frictional resistance, but technology also imperfection, existing pair of sleeve seal is poor, the mud warp used during test pile construction
Often can enter in sleeve gap, cause drag-reduction effect poor, result of the test is forbidden.
Summary of the invention
For overcoming the deficiencies in the prior art, the mesh of the present invention be to provide the double sleeve of a kind of efficient drag reduction of pullout tests stake and
Pullout tests stake drag reduction method.
For reaching above-mentioned purpose, present invention employs techniques below scheme:
The double sleeve of a kind of efficient drag reduction of pullout tests stake, it is described interior that it includes that inner sleeve and outer sleeve, described outer sleeve are set in
Sleeve is peripheral, leaves certain gap between the two；Described inner sleeve contacts with the concrete of test pile, around outer sleeve and stake
Soil contact；Insulated column is set between described inside and outside sleeve to control gap and increase stability between double sleeve；At described overcoat
The bottom of cylinder is provided with the groove of opening upwards, and described inner core bottom is inserted described groove and formed tongue-and-groove structure, and described tongue and groove is adopted
Seal with encapsulant.
As preferably, described insulated column is to be welded in several bar dowels that inner sleeve is peripheral.
As preferably, described encapsulant includes rubber fastening band and self-expanding material, and described rubber fastening band is arranged
Between the bottom gap of inner sleeve Plug Division lower edge and outer sleeve groove；Described self-expanding material is arranged at described inner sleeve and inserts
Connect between the side gap of portion and outer sleeve groove.
As preferably, outside described outer sleeve, it is welded with the Grouting Pipe of diameter 20mm.
As preferably, the top of double sleeves is provided with plug, inside and outside water filling during test pile construction blocking
Gap between sleeve, removes described plug before loading test pile.
As preferably, the inwall of described inner sleeve outer wall and outer sleeve is painted with used oil or butter.
A kind of pullout tests stake drag reduction method, it comprises the following steps:
Step one: in factory's segmental machining inner and outer sleeves, and be set with；
Step 2: carry out the butt welding of inner sleeve at the scene；
Step 3: carry out the butt welding of outer sleeve at the scene；
Step 4: inside and outside sleeve carries out location calibration；
Outer sleeve is set in described inner sleeve peripheral, leaves certain gap between the two；The bottom of double sleeves is tongue and groove knot
Structure, and use encapsulant to seal；Inner/outer tube is connected and seals by the welded top ring flat-plate suitable for reading at double sleeves；
Step 5: double sleeve integral hoisting hand-holes；
Step 6: carry out holing and carrying out test pile construction by test pile diameter, reaches chiseling pile head after design requires until intensity,
Stake head handling is carried out according to the requirement of pullout tests stake static test.
Step 7: disconnect the connecting plate between inside and outside sleeve before pullout tests stake static test.
Step 8: before formal loading, first inner sleeve is carried out preload 100～200KN, makes sleeve pipe in prestrain
Just can disengage with surrounding soil smoothly afterwards.
Further, for described step 2, its detailed process is that two sections of inner sleeves to be connected are hoisted to assembling jig frame,
Fix after centering temporarily；Described moulding bed is provided with the spacing steel plate preventing sleeve from rolling, every section at least two place；The most interim fixing
Lower joint inner sleeve, by jack auxiliary by two sections of inner sleeve docking, fixes with connecting otic placode temporarily, then examines at cylinder nelaton's line
Looking into glacing flatness, qualified rear fastening otic placode is fixed, and carries out segmentation spot welding, is then welded to connect by symmetric mode；For described
Step 3, its process is similar with step 2, and outer sleeve docking glacing flatness labelling stack shell centrage in the outer part corrects.
Further, described step 4 comprises the following steps:
(1) tongue and groove position, inner/outer tube lower end entirety is separated 200mm, fill in 10mm thickness rubber in inner core lower edge and urceolus gap only
Water band, waterstop enters width not less than 80mm, exposed width to external tube groove bottom and on turn over, crane auxiliary lifts inner core, so
Hold out against bottom with jack or jack afterwards, and utilize chuck plate to adjust concentric centering, make rubber fastening band compression form the
Seal together；
(2), after adjusting concentric centering with wedge shape ferrum between double sleeves inner/outer tube suitable for reading, weldering location-plate is fixed, then by urceolus
Choma plate and inner core welded seal；
(3) welding lifting bracket, and measure the vertical relation of bracket bottom surface and outer sleeve longitudinal center labelling so that mounting and adjusting
Perpendicularity；
(4) the double sleeve bottom Grouting Pipe of weld diameter 20mm outside urceolus, at Grouting Pipe exposed junction mantle fiber and add protective cap；
(5) using 1mm thickness 50mm width steel plate to make hoop, reserved charging aperture, hoop hoop, at inner/outer tube rabbeted butt joint, injects certainly
Expanding liquid compound, heat preservation solidification is no less than one day, forms second and seals.
Further, for described step 5, its detailed process is: the double sleeve of integral lifting, at the bottom of lower hand-hole, in double sleeve wall
Injected clear water is also closed with plug；Utilize and press 300mm under action of gravity, by grouting port cement injection after the fixing double sleeves in aperture
Gu Bi.
Further, for described step 6, before the concrete of test pile is poured into a mould, by the steel reinforcement cage of inner sleeve Yu test pile
It is connected.
Beneficial effects of the present invention: the insulated column arranged between (1) inner and outer sleeves is easy to control between double sleeve gap also
Increase stability, and insulated column is that linear contact reduces frictional force with contacting of steel pipe；(2) tongue-and-groove structure that dual material seals
Ensure that not having mud between inside and outside sleeve enters；(3) double cartridge exterior cement injection Gu Bi ensure around double sleeve bottom
Soil quality stabilizing.
Accompanying drawing explanation
Fig. 1 is the double sleeve schematic diagram of pullout tests stake drag reduction of the present invention；
Fig. 2 is the double sleeve bottom tongue and groove seal construction of drag reduction；
Fig. 3 is the double sleeve sectional drawing of drag reduction.
In figure: 1-test pile；2-inner sleeve；3-outer sleeve；4-Grouting Pipe；5-rubber fastening band；6-self-expanding material；
7-insulated column.
Detailed description of the invention
Below in conjunction with accompanying drawing, the technical scheme in the embodiment of the present invention is described, it is clear that described embodiment
It is only a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, the common skill in this area
The every other embodiment that art personnel are obtained under not making creative work premise, broadly falls into the model of present invention protection
Enclose.
As Figure 1-3, the double sleeve of a kind of efficient drag reduction of pullout tests stake 1, it includes inner sleeve 2 and outer sleeve 3, described
It is peripheral that outer sleeve 3 is set in described inner sleeve 2, leaves certain gap between the two；Described inner sleeve 2 is mixed with test pile 1
Solidifying soil contact, outer sleeve 3 contacts with soil around stake；Between the described several bar dowel of inner sleeve peripheral solder is as inside and outside sleeve
Insulated column 7 to control between double sleeve gap and to increase stability；The bottom of described outer sleeve 3 is provided with opening upwards
Groove, described inner core bottom is inserted described groove and is formed tongue-and-groove structure, the employing encapsulant sealing of described tongue and groove；Described sealing material
Material includes that rubber fastening band 5 and self-expanding material 6, described rubber fastening band 5 are arranged at inner sleeve Plug Division lower edge and overcoat
Between the bottom gap of cylinder groove；Described self-expanding material 6 is arranged at the sidepiece of described inner sleeve Plug Division and outer sleeve groove
Between gap.
The Grouting Pipe 4 of diameter 20mm it is welded with outside described outer sleeve.
In order to effectively eliminate side friction, the inwall at described inner sleeve outer wall and outer sleeve be also painted with used oil or
Butter.
The top of described pair of sleeve is provided with plug, between blocking between inside and outside sleeve during test pile construction
Gap, removes described plug before loading test pile.
A kind of pullout tests stake drag reduction method, it comprises the following steps:
Step one: in factory's segmental machining inner and outer sleeves, and be set with；
Step 2: carry out the butt welding of inner sleeve at the scene；
Detailed process is, two sections of inner sleeves to be connected is hoisted to assembling jig frame, fixes after centering temporarily；Described moulding bed
It is provided with the spacing steel plate preventing sleeve from rolling, every section at least two place；Save inner sleeve under the most fixing, assist two with jack
Section inner sleeve docking, fixes with connecting otic placode temporarily, then checks glacing flatness at cylinder nelaton's line, and qualified rear fastening otic placode is solid
Fixed, carry out segmentation spot welding, be then welded to connect by symmetric mode；
Step 3: carry out the butt welding of outer sleeve at the scene；
The butt-welding process of trocar sheath is similar with inner sleeve, and outer sleeve docking glacing flatness labelling stack shell centrage in the outer part comes school
Just.
Step 4: inside and outside sleeve carries out location calibration；
(1) tongue and groove position, inner/outer tube lower end entirety is separated 200mm, fill in 10mm thickness rubber in inner core lower edge and urceolus gap only
Water band, waterstop enters width not less than 80mm, exposed width to external tube groove bottom and on turn over, crane auxiliary lifts inner core, so
Hold out against bottom with jack or jack afterwards, and utilize chuck plate to adjust concentric centering, make rubber fastening band compression form the
Seal together；
(2), after adjusting concentric centering with wedge shape ferrum between double sleeves inner/outer tube suitable for reading, weldering location-plate is fixed, then by urceolus
Choma plate and inner core welded seal；
(3) welding lifting bracket, and measure the vertical relation of bracket bottom surface and outer sleeve longitudinal center labelling so that mounting and adjusting
Perpendicularity；
(4) the double sleeve bottom Grouting Pipe of weld diameter 20mm outside urceolus, at Grouting Pipe exposed junction mantle fiber and add protective cap；
(5) using 1mm thickness 50mm width steel plate to make hoop, reserved charging aperture, hoop hoop, at inner/outer tube rabbeted butt joint, injects certainly
Expanding liquid compound, heat preservation solidification is no less than one day, forms second and seals.
Step 5: double sleeve integral hoisting hand-holes；
Its detailed process is: the double sleeve of integral lifting, at the bottom of lower hand-hole, and injected clear water closing with plug in double sleeve wall；Utilize
300mm is pressed, by grouting port cement injection Gu Bi after the fixing double sleeves in aperture under action of gravity.
Step 6: carry out holing and carrying out test pile construction by test pile diameter, reaches to pick chisel after design requires until intensity
Pile crown, carries out Stake head handling according to the requirement of pullout tests stake static test.Before the concrete of test pile is poured into a mould, by inner sleeve
It is connected with the steel reinforcement cage of test pile.
Step 7: disconnect the connecting plate between inside and outside sleeve before pullout tests stake static test.
Step 8: before formal loading, first inner sleeve is carried out preload 100～200KN, makes sleeve pipe in prestrain
Just can disengage with surrounding soil smoothly afterwards.
Claims (9)
1. the double sleeve of the efficient drag reduction of pullout tests stake, it is characterised in that: described pair of sleeve includes inner sleeve and outer sleeve, institute
State outer sleeve and be set in described inner sleeve periphery, leave certain gap between the two；Described inner sleeve and the coagulation of test pile
Soil contact, outer sleeve contacts with soil around stake；Arrange between described inside and outside sleeve insulated column with control between double sleeve gap and
Increase stability；Be provided with the groove of opening upwards in the bottom of described outer sleeve, described groove type is inserted in described inner core bottom
Becoming tongue-and-groove structure, described tongue and groove uses encapsulant to seal.
The double sleeve of a kind of efficient drag reduction of pullout tests stake the most according to claim 1, it is characterised in that described insulated column is
It is welded in several bar dowels that inner sleeve is peripheral.
The double sleeve of a kind of efficient drag reduction of pullout tests stake the most according to claim 1, it is characterised in that described encapsulant
Including rubber fastening band and self-expanding material, described rubber fastening band is arranged at inner sleeve Plug Division lower edge and outer sleeve groove
Bottom gap between；Described self-expanding material be arranged at described inner sleeve Plug Division and outer sleeve groove side gap it
Between.
The double sleeve of a kind of efficient drag reduction of pullout tests stake the most according to claim 1, it is characterised in that at described outer sleeve
Outside is welded with the Grouting Pipe of diameter 20mm.
The double sleeve of a kind of efficient drag reduction of pullout tests stake the most according to claim 1, it is characterised in that outside described inner sleeve
The inwall of wall and outer sleeve is painted with used oil or butter.
6. a pullout tests stake drag reduction method, it is characterised in that comprise the following steps:
Step one: in factory's segmental machining inner and outer sleeves, and be set with；
Step 2: carry out the butt welding of inner sleeve at the scene；
Step 3: carry out the butt welding of outer sleeve at the scene；
Step 4: inside and outside sleeve carries out location calibration；
Outer sleeve is set in described inner sleeve peripheral, leaves certain gap between the two；The bottom of double sleeves is tongue and groove knot
Structure, and use encapsulant to seal；Inner/outer tube is connected and seals by the welded top ring flat-plate suitable for reading at double sleeves；
Step 5: double sleeve integral hoisting hand-holes；
Step 6: carry out holing and carrying out test pile construction by test pile diameter, reaches chiseling pile head after design requires until intensity,
Stake head handling is carried out according to the requirement of pullout tests stake static test；
Step 7: disconnect the connecting plate between inside and outside sleeve before pullout tests stake static test；
Step 8: before formal loading, first inner sleeve is carried out preload 100～200KN.
A kind of pullout tests stake drag reduction method the most according to claim 6, it is characterised in that for described step 2, will
Two sections of inner sleeves to be connected are hoisted to assembling jig frame, fix after centering temporarily；Described moulding bed is provided with and prevents sleeve from rolling
Spacing steel plate, every section at least two place；Save inner sleeve under the most fixing, by jack auxiliary by two sections of inner sleeves docking, use
Connecting otic placode to fix temporarily, then check glacing flatness at cylinder nelaton's line, qualified rear fastening otic placode is fixed, and carries out segmentation spot welding,
Then it is welded to connect by symmetric mode；For described step 3, its process is similar with step 2, outer sleeve docking glacing flatness
Labelling stack shell centrage corrects in the outer part.
A kind of pullout tests stake drag reduction method the most according to claim 6, it is characterised in that described step 4 includes following
Step:
(1) tongue and groove position, inner/outer tube lower end entirety is separated 200mm, fill in 10mm thickness rubber in inner core lower edge and urceolus gap only
Water band, waterstop enters width not less than 80mm, exposed width to external tube groove bottom and on turn over, crane auxiliary lifts inner core, so
Hold out against bottom with jack or jack afterwards, and utilize chuck plate to adjust concentric centering, make rubber fastening band compression form the
Seal together；
(2), after adjusting concentric centering with wedge shape ferrum between double sleeves inner/outer tube suitable for reading, weldering location-plate is fixed, then by urceolus
Choma plate and inner core welded seal；
(3) welding lifting bracket, and measure the vertical relation of bracket bottom surface and outer sleeve longitudinal center labelling so that mounting and adjusting
Perpendicularity；
(4) the double sleeve bottom Grouting Pipe of weld diameter 20mm outside urceolus, at Grouting Pipe exposed junction mantle fiber and add protective cap；
(5) using 1mm thickness 50mm width steel plate to make hoop, reserved charging aperture, hoop hoop, at inner/outer tube rabbeted butt joint, injects certainly
Expanding liquid compound, heat preservation solidification is no less than one day, forms second and seals.
A kind of pullout tests stake drag reduction method the most according to claim 6, it is characterised in that for described step 5, its
Detailed process is: the double sleeve of integral lifting, at the bottom of lower hand-hole, and injected clear water closing with plug in double sleeve wall；Gravity is utilized to make
300mm is pressed, by grouting port cement injection Gu Bi after the fixing double sleeves in aperture under with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610568336.7A CN106065622B (en) | 2016-07-19 | 2016-07-19 | The double sleeves of the efficient drag reduction of pullout tests stake and pullout tests stake drag reduction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610568336.7A CN106065622B (en) | 2016-07-19 | 2016-07-19 | The double sleeves of the efficient drag reduction of pullout tests stake and pullout tests stake drag reduction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106065622A true CN106065622A (en) | 2016-11-02 |
| CN106065622B CN106065622B (en) | 2018-05-11 |
Family
ID=57206603
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610568336.7A Expired - Fee Related CN106065622B (en) | 2016-07-19 | 2016-07-19 | The double sleeves of the efficient drag reduction of pullout tests stake and pullout tests stake drag reduction method |
Country Status (1)
| Country | Link |
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| CN (1) | CN106065622B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108425383A (en) * | 2018-03-23 | 2018-08-21 | 深圳市工勘岩土集团有限公司 | The construction method of side friction is isolated in test pile |
| CN108517901A (en) * | 2018-03-23 | 2018-09-11 | 深圳市工勘岩土集团有限公司 | Double casing structures for test pile |
| CN109057722A (en) * | 2018-07-13 | 2018-12-21 | 金川集团股份有限公司 | Casing bit and its fixing means in a kind of drilling of mine down-hole |
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| GB476615A (en) * | 1936-03-27 | 1937-12-13 | Braithwaite & Company Engineer | Improvements in or relating to screw bearing piles |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108425383A (en) * | 2018-03-23 | 2018-08-21 | 深圳市工勘岩土集团有限公司 | The construction method of side friction is isolated in test pile |
| CN108517901A (en) * | 2018-03-23 | 2018-09-11 | 深圳市工勘岩土集团有限公司 | Double casing structures for test pile |
| CN109057722A (en) * | 2018-07-13 | 2018-12-21 | 金川集团股份有限公司 | Casing bit and its fixing means in a kind of drilling of mine down-hole |
| CN109057722B (en) * | 2018-07-13 | 2024-03-05 | 金川集团股份有限公司 | Casing device in underground mine drilling and fixing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106065622B (en) | 2018-05-11 |
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