CN106400856A - Loading device and method for static load test of pile foundation - Google Patents
Loading device and method for static load test of pile foundation Download PDFInfo
- Publication number
- CN106400856A CN106400856A CN201611096449.8A CN201611096449A CN106400856A CN 106400856 A CN106400856 A CN 106400856A CN 201611096449 A CN201611096449 A CN 201611096449A CN 106400856 A CN106400856 A CN 106400856A
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- China
- Prior art keywords
- crossbeam
- test
- pile
- support column
- preloading
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
Abstract
The invention discloses a loading device and method for a static load test of a pile foundation. The loading device comprises girders arranged on a test pile, a loading device body arranged at one end of each girder and a fixing device arranged at the other end of each girder; two ends of the girders are respectively arranged at two sides of the test pile; the fixing device comprises a plurality of supporting pillars connected with raft foundations, and the other ends of the supporting pillars are connected with one end of each girder; and the raft foundations are fixed in a soil layer through anchor rods. The pile loading amount required by the traditional static loading test is reduced by utilizing the lever principle; and meanwhile, all testing devices adopted by the invention are mechanically connected, are convenient and rapid to mount and can be repeatedly used, so that the pile loading transportation cost and the cost of the testing devices are reduced.
Description
Technical field
The invention belongs to Civil Engineering Construction experimental technique field and in particular to a kind of for pile foundation static test plus
Carry and put and loading method.
Background technology
The high speed development built with Chinese Urbanization and urban land resource in short supply, the skyscraper that continues to bring out,
Improve constantly bearing capacity demand and construction quality require all make high capacity, sedimentation little, make flexible and applicable
The extensive pile foundation of condition becomes the most base form of above-mentioned field application.And the requirement according to related specifications, need to carry out
Pile foundation carries out static pressure test to evaluate whether its bearing capacity meets design requirement.In traditional pile foundation static test, load
Main jack offer, being continuously increased with bearing capacity with preloading, the transport of preloading occupies static test expense
Significant portion.Meanwhile, in soft clay area, ground buttress or counter-force stake employed in traditional static test, can be less in loading
When produce excessive sedimentation thus affecting the measurement of static load displacement in process of the test.
Content of the invention
The invention aims to solving above-mentioned pile foundation static load high cost, the technical problem of test difficulty, provide one kind
Convenient operation, the charger for pile foundation static test of economical rationality and loading method.
In order to solve the above problems, the present invention is achieved by technical scheme below：
Charger for pile foundation static test of the present invention, for the charger of pile foundation static test,
It is characterized in that：Including some crossbeams being horizontally set on test pile, it is arranged on the charger of crossbeam one end, is arranged on
The fixing device of the crossbeam other end；
The two ends of described crossbeam are separately positioned on the both sides of described test pile；One end of described some crossbeams is with described examination
Test stake to be uniformly distributed in a circumferential direction for the center of circle, described fixing device includes some support columns being connected with raft foundation, described
The other end of support column is connected with one end of crossbeam；Described raft foundation is fixed in soil layer by some anchor poles.
Further, it is horizontally disposed with to ensure crossbeam, between described test pile and described crossbeam, is provided with jack, lead to
Overregulate jack so that described crossbeam holding level.
Further, in order to load uniformly, and avoid damage to test pile end face, the top of described test pile is provided with and adds
Carry cushion cap, described jack is arranged between described loading cushion cap and described crossbeam.
Further, load for convenience, described charger includes preloading frame, by described preloading sash hanger on crossbeam
Some pull bars, described preloading inframe is evenly arranged with some preloadings.
Further, the bottom of described preloading frame is provided with some screwed holes, described crossbeam is provided with so that described in draw
The preformed hole that the bar other end runs through；
One end of described pull bar is provided with the external screw thread with the cooperation of described screwed hole；The other end of described pull bar is provided with expansion
Major part, described enlarged footing is more than the diameter of described preformed hole.
Further, the edge of described preformed hole is provided with groove corresponding with described enlarged footing.
Further, load and unload for convenience, one end of described support column is provided with end plate, described end plate pass through bolt with big
Beam connects；The other end of described support column is arranged with steel bushing, and described steel bushing is embedded on described raft foundation, described support column
The one end being connected with steel bushing is provided with pin hole, the diameter parallel of the axis of described pin hole and described crossbeam, described steel bushing
Cylinder is connected by inserting the latch of described pin hole with described support column.
Further, in order to strengthen overall structure, increase steadiness, the outer wall of described support column is provided with crossbeam even
The first diagonal brace connecing, the two ends of described first diagonal brace are connected with support column or crossbeam by the first diagonal brace end plate respectively；
The second diagonal brace being connected with crossbeam is provided with described preloading frame, the two ends of described second diagonal brace pass through second respectively
Diagonal brace end plate is connected with crossbeam or preloading frame.
A kind of loading method for dead load test on pile foundation, comprises the following steps：
S1, pour raft foundation and test pile, and the steel bushing being used for support column described in build-in is embedded in described raft foundation
Concrete in, by anchor pole by bald for raft foundation in soil layer；
S2, with latch, the lower end of support column is fixed in steel bushing；
S3, the top of described test pile along described test pile axisymmetrical arrange some jack, adjust described thousand
The depth pistion of the height on jin top；
S4, in the piston end of described jack, crossbeam is installed, some crossbeams are sequentially overlapped, one end of some crossbeams with institute
It is distributed uniformly and circumferentially centered on stating test pile；One end of described crossbeam is connected with support column；Described jack makes institute
State crossbeam to be horizontally disposed with；
S5, preformed hole pull bar being inserted from top to bottom on described crossbeam, and make described pull bar lower end be fastened on preloading frame
In upper corresponding screw；
S6, by preloading frame increase preloading realize to test pile load.
Further, the top of described test dress is provided with loading cushion cap, and described jack is arranged on described loading cushion cap
On, described jack is arranged with regard to the central axis Central Symmetry of described test pile；
First diagonal brace is set between described support column and described crossbeam, arranges between described loading frame and described crossbeam
Second diagonal brace.
Compared with prior art, the invention has the beneficial effects as follows：
The present invention utilizes lever principle, reduces the heap carrying capacity required for traditional static test, and the present invention adopts simultaneously
Experimental rig is by mechanical connection, easy for installation, quick, can Reusability, thus reducing transport and the experimental rig of preloading
Totle drilling cost.
Brief description
Below in conjunction with the accompanying drawings the specific embodiment of the present invention is described in further detail, wherein：
Fig. 1 is the bowing to schematic diagram of the embodiment one of the charger for pile foundation static test of the present invention；
Fig. 2 is the side schematic view of the embodiment one of the charger for pile foundation static test of the present invention；
Fig. 3 is the generalized section of A-A in Fig. 1；
Fig. 4 is pull bar and crossbeam connection diagram；
Fig. 5 is the structural representation of the preloading frame for pile foundation static test of the present invention.
Fig. 6 is the top view of the embodiment two of the charger for pile foundation static test of the present invention.
Specific embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are illustrated it will be appreciated that preferred reality described herein
Apply example to be merely to illustrate and explain the present invention, be not intended to limit the present invention.
Embodiment one
As shown in Fig. 1～Fig. 5, the charger for pile foundation static test of the present invention, including being arranged on test
Stake 1 on some crossbeams 2, be arranged on the charger of crossbeam 2 one end, be arranged on the fixing device of crossbeam 2 other end；This enforcement
In example, including four crossbeams 2, the two ends of described crossbeam 2 are separately positioned on the both sides of described test pile 1；One end of described crossbeam 2
It is uniformly distributed in a circumferential direction with described test pile 1 for the center of circle, described crossbeam 2 is sequentially overlapped and is arranged on described test pile 1
Top.The top of described test pile 1 is provided with loading cushion cap 7, is provided with some between described loading cushion cap 7 and described crossbeam 2
Jack 9, described jack 9 is arranged with regard to described test pile central axis Central Symmetry.
Described fixing device includes some support columns 6 being connected with raft foundation 4, the other end of described support column 6 and crossbeam 2
One end connect.In the present embodiment, support column quantity is 2, but the support column 6 of the present invention is not limited to 2, can be according to examination
Test needs, setting 3,4,5,6 etc. multiple.One end of described support column 6 is provided with end plate 62, and described end plate 62 passes through
Bolt 10 is connected with crossbeam 2；The other end of described support column 6 is arranged with steel bushing 12, and described steel bushing 12 is embedded in described raft
On basis 4, described support column 6 lower end is provided with some pin holes 61, and steel is fixed on by latch 8 in the lower end of described support column 6
In sleeve 12, described pin hole 61 is identical with described crossbeam 2 direction with the direction of described latch 8.
Described raft foundation 4 is fixed in soil layer by some anchor poles 22.
The outer wall of described support column 6 is provided with the first diagonal brace 17 being connected with crossbeam 2, and the two ends of described first diagonal brace 17 are divided
Tong Guo the first diagonal brace end plate 18 not be connected with support column 6 or crossbeam 2.
Described charger includes preloading frame 3, some pull bars 5 being suspended on described preloading frame 3 on crossbeam 2, described heap
Carry in frame 5 and be evenly arranged with some preloadings.The bottom of described preloading frame 3 is provided with some screwed holes 31, and described crossbeam 2 is arranged
Have so that the preformed hole 21 that runs through of described pull bar 5 other end；One end of described pull bar 5 is provided with and the cooperation of described screwed hole 31
External screw thread；The other end of described pull bar 5 is provided with enlarged footing 51, and described enlarged footing 51 is more than the diameter of described preformed hole 21, institute
The edge stating preformed hole 21 is provided with groove 22 corresponding with described enlarged footing 51.In the present embodiment, described enlarged footing 51 is circle
Frustum, corresponding described groove 22 is taper seat.Described preloading frame 3 side wall is steel frame construction, and base plate is by steelframe and steel bushing group
Become.
The second diagonal brace 20 being connected with crossbeam 2 is provided with described preloading frame 3, the two ends of described second diagonal brace 20 lead to respectively
Cross the second diagonal brace end plate 21 to be connected with crossbeam 2 or preloading frame 3 respectively.
A kind of loading method for dead load test on pile foundation, comprises the following steps：
S1, pour raft foundation 4, test pile 1 and load cushion cap 7, and will be pre- for the steel bushing 12 being used for support column 6 described in build-in
It is embedded in the concrete of described raft foundation 4, by anchor pole 22, raft foundation 4 is fixed in soil layer.
S2, the lower end of support column 6 is fixed in the steel bushing being mounted in raft foundation 4 with described latch 8.
S3, it is symmetrical arranged some jack 9 with regard to the axis centre of described test pile 1 in described loading on cushion cap 7, adjustment
After the height of described jack 9 makes to install described crossbeam 2, described crossbeam 2 level, three crossbeams 2 are sequentially overlapped and are arranged on institute
State on jack 9, one end of three crossbeams 2 is uniformly distributed with described test pile 1 in a circumferential direction for the center of circle.
S4, pull bar 5 is inserted the preformed hole 21 on described crossbeam 2 from top to bottom, and make the fastening setting of described pull bar 5 lower end
In corresponding screw 31 on preloading frame 3.
S5, between described crossbeam 2 and described support column 6 and to be respectively mounted first between described crossbeam 2 and preloading frame 4 oblique
Support 17 and the second diagonal brace 20.
S6, installation displacement measuring device, preloading are lifted step by step to described preloading frame 4, to realize adding of static test
Carry.
Embodiment two,
As shown in fig. 6, being used for the quantity except crossbeam 2 of the charger of pile foundation static test described in the present embodiment,
Other structures are identical with embodiment one with loading method, and the crossbeam 2 in the present embodiment is three, and one end of crossbeam 2 is to test
Stake is uniformly distributed in a circumferential direction for the center of circle, and described crossbeam 2 is sequentially overlapped on described jack.Used in the present invention big
The quantity of beam 2 is not limited in embodiment one 4 or embodiment two 3 or according to the test needs implemented, if
Put 2 crossbeams, 5 crossbeams etc..
The present invention passes through to arrange some crossbeams on test pile, and crossbeam one end is fixed, and the other end adds preloading, using thick stick
Rod principle, realizes the loading to test pile, by increasing preloading frame to test pile distance, to reduce heap mounted mass, reaches same
Load effect, and a plurality of crossbeam even circumferential distribution so that loading force evenly.The experimental rig that the present invention adopts simultaneously
By mechanical connection, easy for installation, quick, can Reusability, thus reducing the transport of preloading and the cost of experimental rig.
It is used for the charger of pile foundation static test and the other structures of loading method referring to existing described in the present embodiment
Technology.
The above, be only presently preferred embodiments of the present invention, not the present invention is made with any pro forma restriction, therefore
Every any modification without departing from technical solution of the present invention content, according to the technical spirit of the present invention, above example made,
Equivalent variations and modification, all still fall within the range of technical solution of the present invention.
Claims (10)
1. a kind of charger for pile foundation static test it is characterised in that：If including being horizontally set on test pile
Dry bar crossbeam, it is arranged on the charger of crossbeam one end, is arranged on the fixing device of the crossbeam other end；
The two ends of described crossbeam are separately positioned on the both sides of described test pile；Described some crossbeams are with described test pile as the center of circle
Be uniformly distributed in a circumferential direction, described fixing device includes some support columns being connected with raft foundation, described support column another
One end is connected with one end of crossbeam；Described raft foundation is fixed in soil layer by some anchor poles.
2. according to claim 1 be used for pile foundation static test charger it is characterised in that：Described test pile and institute
State and between crossbeam, be provided with jack.
3. according to claim 2 be used for pile foundation static test charger it is characterised in that：The top of described test pile
End is provided with loading cushion cap, and described jack is arranged between described loading cushion cap and described crossbeam.
4. according to any one of claims 1 to 3 be used for pile foundation static test charger it is characterised in that：Described
Charger include preloading frame, by described preloading sash hanger some pull bars on crossbeam, described preloading inframe is provided with some
Preloading.
5. according to claim 4 be used for pile foundation static test charger it is characterised in that：The bottom of described preloading frame
Portion is provided with some screwed holes, described crossbeam is provided with so that the preformed hole that runs through of the described pull bar other end；
One end of described pull bar is provided with the external screw thread with the cooperation of described screwed hole；The other end of described pull bar is provided with expansion
Head, described enlarged footing is more than the diameter of described preformed hole.
6. according to claim 5 be used for pile foundation static test charger it is characterised in that：The side of described preformed hole
Edge is provided with groove corresponding with described enlarged footing.
7. according to claim 4 or 5 be used for pile foundation static test charger it is characterised in that：Described support column
One end be provided with end plate, described end plate is connected with crossbeam by bolt；The other end of described support column is arranged with steel bushing, institute
State steel bushing to be embedded on described raft foundation, one end that described support column is connected with steel bushing is provided with pin hole, described latch
The axis in hole and the diameter parallel of described crossbeam, the latch that described steel bushing and described support column pass through to insert described pin hole connects
Connect.
8. according to claim 7 be used for pile foundation static test charger it is characterised in that：Outside described support column
Wall is provided with the first diagonal brace being connected with crossbeam, the two ends of described first diagonal brace pass through respectively the first diagonal brace end plate and support column or
Crossbeam connects；
The second diagonal brace being connected with crossbeam is provided with described preloading frame, the second diagonal brace is passed through at the two ends of described second diagonal brace respectively
End plate is connected with crossbeam or preloading frame.
9. a kind of loading method for dead load test on pile foundation it is characterised in that：Comprise the following steps：
S1, pour raft foundation and test pile, and the steel bushing being used for support column described in build-in is embedded in the mixed of described raft foundation
In solidifying soil, by anchor pole, raft foundation is fixed in soil layer；
S2, with latch, the lower end of support column is fixed in steel bushing；
S3, it is symmetrical arranged some jack on the top of described test pile along the axis centre of described test pile, adjust described thousand
The depth pistion on jin top；
S4, in the piston end of described jack, crossbeam is installed, some crossbeams are sequentially overlapped, and the direction at crossbeam two ends is with described test
It is distributed uniformly and circumferentially centered on stake；One end of described crossbeam is connected with support column；Described jack makes described crossbeam
It is horizontally disposed with；
S5, preformed hole pull bar being inserted from top to bottom on described crossbeam, and it is right on preloading frame so that described pull bar lower end is fastened on
In the screw answered；
S6, by preloading frame increase preloading realize to test pile load.
10. according to claim 9 be used for dead load test on pile foundation loading method it is characterised in that：The top of described test dress
End is provided with loading cushion cap, and described jack is arranged on described loading cushion cap, and described jack is with regard in described test pile
Heart axis centre is symmetrical arranged；
First diagonal brace is set between described support column and described crossbeam, arranges second between described loading frame and described crossbeam
Diagonal brace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611096449.8A CN106400856A (en) | 2016-12-02 | 2016-12-02 | Loading device and method for static load test of pile foundation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611096449.8A CN106400856A (en) | 2016-12-02 | 2016-12-02 | Loading device and method for static load test of pile foundation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106400856A true CN106400856A (en) | 2017-02-15 |
Family
ID=58083346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611096449.8A Pending CN106400856A (en) | 2016-12-02 | 2016-12-02 | Loading device and method for static load test of pile foundation |
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|---|---|
| CN (1) | CN106400856A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113622470A (en) * | 2021-08-17 | 2021-11-09 | 南京工程学院 | Pile loading method pile test site balancing method |
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| CN104088307A (en) * | 2014-07-21 | 2014-10-08 | 张百全 | Method for detecting vertical bearing capacity of pile foundation |
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| CN105862937A (en) * | 2016-05-09 | 2016-08-17 | 东华理工大学 | Pressing and pulling integrated experimental indoor pile model test device |
| CN205576989U (en) * | 2016-05-09 | 2016-09-14 | 东华理工大学 | Comprehensive laboratory experiment stake model experiment device is pressed, pulled out |
| CN206328785U (en) * | 2016-12-02 | 2017-07-14 | 广州建设工程质量安全检测中心有限公司 | A kind of loading device for pile foundation static test |
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2016
- 2016-12-02 CN CN201611096449.8A patent/CN106400856A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202577378U (en) * | 2012-04-20 | 2012-12-05 | 宏润建设集团股份有限公司 | Single pile static loading test rack |
| CN203066126U (en) * | 2012-12-31 | 2013-07-17 | 同济大学 | Test device for simulating vertical tension-compression load effect on pile foundations |
| CN104088307A (en) * | 2014-07-21 | 2014-10-08 | 张百全 | Method for detecting vertical bearing capacity of pile foundation |
| CN204139197U (en) * | 2014-08-28 | 2015-02-04 | 新疆风电工程设计咨询有限责任公司 | Bottom enlarging prestress anchoring pile wind energy conversion system basis |
| CN104975619A (en) * | 2015-07-03 | 2015-10-14 | 朱洋 | Detecting device and detecting method for pile foundation static load |
| CN105862937A (en) * | 2016-05-09 | 2016-08-17 | 东华理工大学 | Pressing and pulling integrated experimental indoor pile model test device |
| CN205576989U (en) * | 2016-05-09 | 2016-09-14 | 东华理工大学 | Comprehensive laboratory experiment stake model experiment device is pressed, pulled out |
| CN206328785U (en) * | 2016-12-02 | 2017-07-14 | 广州建设工程质量安全检测中心有限公司 | A kind of loading device for pile foundation static test |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113622470A (en) * | 2021-08-17 | 2021-11-09 | 南京工程学院 | Pile loading method pile test site balancing method |
| CN113622470B (en) * | 2021-08-17 | 2022-11-08 | 南京工程学院 | Pile loading method pile test site balancing method |
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Application publication date: 20170215 |