CN103147465B - Load box for testing open caisson with self-balancing method - Google Patents
Load box for testing open caisson with self-balancing method Download PDFInfo
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- CN103147465B CN103147465B CN201310068673.6A CN201310068673A CN103147465B CN 103147465 B CN103147465 B CN 103147465B CN 201310068673 A CN201310068673 A CN 201310068673A CN 103147465 B CN103147465 B CN 103147465B
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- shaped steel
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- ring baffle
- open caisson
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- 238000012360 testing method Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 101
- 239000010959 steel Substances 0.000 claims abstract description 101
- 238000006073 displacement reaction Methods 0.000 claims abstract description 18
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 17
- 238000013459 approach Methods 0.000 claims description 14
- 238000003466 welding Methods 0.000 claims description 11
- 239000004567 concrete Substances 0.000 claims description 10
- 238000009835 boiling Methods 0.000 claims description 9
- 230000010412 perfusion Effects 0.000 claims description 9
- 238000012546 transfer Methods 0.000 claims description 8
- 238000005516 engineering process Methods 0.000 description 5
- 239000003921 oil Substances 0.000 description 4
- 238000004873 anchoring Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a load box for testing an open caisson with a self-balancing method, which comprises a load box body, hydraulic oil cylinders, hydraulic oil pipes and a hydraulic loading device. The hydraulic oil pipes and the hydraulic loading device are connected with the hydraulic oil cylinders sequentially; the load box body comprises an upper annular steel plate, a lower annular steel plate, an outer annular baffle board and an inner annular baffle board, wherein the upper annular steel plate and the lower annular steel plate are vertically opposite, the inner annular baffle board and the outer annular baffle board are arranged on the inner sides and the peripheries of the upper annular steel plate and the lower annular steel plate respectively, and the inner annular baffle board and the outer annular baffle board form a closed box body with the upper annular steel plate and the lower annular steel plate. When the hydraulic oil cylinder is preloaded, the upper annular steel plate and the lower annular steel plate can vertically move respectively; the hydraulic oil cylinders are arranged in the load box, the bottoms of the hydraulic oil cylinders are fixedly connected to the upper annular steel plate, pistons of the hydraulic oil cylinders are contacted with the upper annular steel plate; and the load box for testing the open caisson with the self-balancing method further comprises displacement transferring devices for testing displacement of the upper annular steel plate and the lower annular steel plate. The load box is reliable, practical and economical.
Description
Technical field
The present invention relates to a kind of load box for the test of open caisson self-balancing approach.
Background technology
Open caisson is a kind of in numerous type of foundations, the pit shaft shape works of normally making by Reinforced Concrete Materials.Not only rigidity is large for open caisson, bearing capacity is high, and floor space is few, in land water, all can build.Except the basis as is in general sense used, open caisson is also through being usually used in various underground structures and structure, as underground parking, road tunnel, underground tank, large-size chemical storage tank, mine shaft, bank intake strucure, container terminal, mole etc., normal this base form that adopts when huge load need to be born in basis.Therefore, the load-carrying properties of understanding open caisson seem particularly important, and field static load test be generally acknowledge the most effectively, method of testing the most accurately.
As everyone knows, traditional pile foundation static load test method has two kinds, and the one, accumulation load method, the 2nd, anchored pile-testing method.Two kinds of methods are all to adopt oil jack to withstand on a top load application, and the counter-force of jack, the former is by the heavy balance with it of the heap on reaction frame, the latter passes to anchoring pile by reaction frame by counter-force, with the uplift resistance balance of anchoring pile.The subject matter of its existence is: the former must solve load source, stacking and transportation problem that hundreds of ton is even gone up kiloton, the latter must arrange many anchoring piles and counter-force crossbeam, required somewhat expensive not only, the time is longer, and is subject to the restriction of tonnage and site condition.So that the bearing capacity of the stake (as mountain region, bridge pier) in many large-tonnage stakes and special place often can not get accurate data, and the potentiality of foundation pile can not rationally be brought into play, and this is also a great problem that open caisson loading test faces.
Self-balancing measuring technology is a kind of foundation bearing capacity novel test technology that at home and abroad develops rapidly in recent years and promote the use of, it can solve the insoluble engineering difficult problems such as test pile waterborne, long and narrow place test pile, large-diameter deep long pile loading test of traditional experiment method effectively, and saving time, the advantage such as economy, advanced technology and be subject to engineering circles favor.Different from accumulation load method and anchored pile-testing method, self-balancing approach is arranged on foundation bottom or middle and lower part by charger, makes basic upper and lower counter force system each other, can not limited by place like this, and increases substantially test tonnage.Conventional load box inside is solid, can not be directly used in the test of open caisson self-balancing, and due to open caisson enormous size, load box is generally prefabrication, and for large scale load box, transportation becomes again another difficult problem.
Summary of the invention
Goal of the invention: the technical problem to be solved in the present invention is to provide a kind of load box for the test of open caisson self-balancing approach.
Technical scheme: in order to solve the problems of the technologies described above, adopt following technical scheme:
A load box for the test of open caisson self-balancing approach, comprises load casing, hydraulic jack, the hydraulic oil pipe being connected in turn with hydraulic jack and hydraulic loading device;
Described load casing comprises doughnut-shaped steel plate, lower doughnut-shaped steel plate, outer ring baffle plate, interior ring baffle, wherein, upper doughnut-shaped steel plate and lower doughnut-shaped steel plate are oppositely arranged up and down, interior ring baffle and outer ring baffle plate are located at respectively inner side and the periphery of doughnut-shaped steel plate and lower doughnut-shaped steel plate, and form airtight casing with upper doughnut-shaped steel plate and lower doughnut-shaped steel plate, when hydraulic jack prestrain, upper doughnut-shaped steel plate and lower doughnut-shaped steel plate can move up and down separately;
Described hydraulic jack is located in load casing, and the bottom of hydraulic jack is connected on lower doughnut-shaped steel plate, and the piston of hydraulic jack contacts with upper doughnut-shaped steel plate;
The described load box for the test of open caisson self-balancing approach also comprises for testing the displacement transfer device of upper doughnut-shaped steel plate and lower doughnut-shaped steel plate displacement.
For the ease of installing, described outer ring baffle plate and interior ring baffle respectively have one deck, between the upper end of outer ring baffle plate and interior ring baffle or the one end in lower end and upper doughnut-shaped steel plate or lower doughnut-shaped steel plate for spot welding is connected, the other end with upper doughnut-shaped steel plate or lower doughnut-shaped steel plate between for being fixedly connected with, when hydraulic jack prestrain, spot welding connects disconnection.
In order to prevent that earth from falling into load casing, improve the convenience of operation simultaneously, described outer ring baffle plate and interior ring baffle respectively have two-layer, outer ring baffle plate comprises outer outer ring baffle plate and inner outer ring baffle plate from outside to inside successively, and interior ring baffle comprises outer interior ring baffle and inner interior ring baffle from outside to inside successively; Described refer to from outside to inside from load box external in load casing; The described outer external diameter of outer ring baffle plate and the external diameter of open caisson equate, the internal diameter of outer interior ring baffle equates in the internal diameter of open caisson; Between the upper end of described outer outer ring baffle plate and upper doughnut-shaped steel plate for being fixedly connected with, between lower end and lower doughnut-shaped steel plate for spot welding is connected, between the upper end of inner outer ring baffle plate and upper doughnut-shaped steel plate, be not connected, between lower end and lower doughnut-shaped steel plate for being fixedly connected with; Between the upper end of described outer interior ring baffle and upper doughnut-shaped steel plate for being fixedly connected with, between lower end and lower doughnut-shaped steel plate for spot welding is connected, between the upper end of inner interior ring baffle and upper doughnut-shaped steel plate, be not connected, between lower end and lower doughnut-shaped steel plate for being fixedly connected with; When hydraulic jack prestrain, spot welding connects disconnection.
In order to facilitate the cast of open caisson, guarantee the quality of open caisson, on upper doughnut-shaped steel plate and lower doughnut-shaped steel plate, be equipped with frost boiling hole and concrete perfusion conduit hole.
In order to improve the accuracy of test, symmetrical centered by the ring heart of frost boiling hole and the above doughnut-shaped steel plate in concrete perfusion conduit hole and lower doughnut-shaped steel plate.
In order further to meet test request, improve the accuracy of test simultaneously, hydraulic jack is not less than eight, and symmetrical centered by the ring heart of above doughnut-shaped steel plate and lower doughnut-shaped steel plate, and is interspersed with frost boiling hole and concrete perfusion conduit hole.
Beneficial effect: the present invention compared with prior art, has following advantages:
1. reliability: this load box internal-and external diameter is consistent with open caisson, inner space is large, unlikely affect sinking process simultaneously workman in the inner work such as cut the earth, fetch earth of open caisson, and load cell position is fixed, can not throw off because of the factors such as soil compaction effect and open caisson, can reduce to greatest extent the impact on well sinking process, therefore can guarantee the quality of the complete and open caisson of load box simultaneously.Load box arranges two-layer outer ring baffle plate and interior ring baffle, when load box is started working, upper doughnut-shaped steel plate and outer outer ring baffle plate and outer interior ring baffle move up, existence due to inner outer ring baffle plate and inner interior ring baffle, can avoid the earth of load box outside to enter load box, affect the normal load of load box.
2. practicality: this load box can be selected suitable hydraulic jack range and quantity according to actual conditions, when significantly improving test tonnage, but can not cause the waste of hydraulic jack range.When load box is installed, be directly installed on the cage of reinforcement of lower joint open caisson, working face is safer, not limited by place, easy to assembly.Simultaneously, owing to being provided with frost boiling hole and concrete perfusion conduit hole, concrete perfusion conduit can be built lower joint open caisson through the guide hole of load box, and concrete top mud can be discharged by being arranged on the frost boiling hole of load box simultaneously, can guarantee the quality that lower joint open caisson is built.Then carry out building of upper joint open caisson, until load box, sink down into together with open caisson after assigned address, can test, greatly shortened and tested required duration and manpower and materials.
3. economy: this load box approaches the height of hydraulic jack on design height, hydraulic jack flexible arrangement, thus save great deal of steel, greatly reduce the manufacturing cost of load box.Meanwhile, load box is disposable utilization, forever imbeds open caisson, after sinking, can directly test, and can not affect the construction of open caisson, has reduced to greatest extent and has tested required every operation, time and manpower and materials, and its economic performance is higher.
Accompanying drawing explanation
Fig. 1 is open caisson bearing capacity self-balancing test schematic diagram;
Fig. 2 is the plane structure schematic diagram of load box of the present invention;
Fig. 3 is the structural representation of load box of the present invention;
In figure: upper doughnut-shaped steel plate 1, lower doughnut-shaped steel plate 2, hydraulic jack 3, outer ring baffle plate 4, interior ring baffle 5, displacement transfer device 6, hydraulic oil pipe 7, upper joint open caisson 8, lower joint open caisson 9, displacement transducer 10, displacement measurement base beam 11, hydraulic loading device 12, foundation ditch 13, computer 14, frost boiling hole 301 and concrete perfusion conduit hole 302.
The specific embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is further described in detail.
Load box for the test of open caisson self-balancing approach of the present invention, comprise the upper doughnut-shaped steel plate 1 and the lower doughnut-shaped steel plate 2 that are oppositely arranged up and down, be arranged on the hydraulic jack 3 between doughnut-shaped steel plate 1 and lower doughnut-shaped steel plate 2, outer ring baffle plate 4 and interior ring baffle 5, the quantity of hydraulic jack 3 is ten, and symmetrical centered by the ring heart of above doughnut-shaped steel plate 1 and lower doughnut-shaped steel plate 2, the cylinder base upper surface that is arranged on lower doughnut-shaped steel plate 2 with bolts of hydraulic jack 3, the piston of hydraulic jack 3 is connected with the bottom surface of upper doughnut-shaped steel plate 1, outer ring baffle plate 4 is positioned at the outer rim of doughnut-shaped steel plate 1 and lower doughnut-shaped steel plate 2, the upper end of outer ring baffle plate 4 is connected with the downside spot welding of upper doughnut-shaped steel plate 1, the upside of lower end and lower doughnut-shaped steel plate 2 welds completely, interior ring baffle 5 is positioned at the inclined to one side hydraulic jack of the inner edge place of doughnut-shaped steel plate 1 and lower doughnut-shaped steel plate 2, be consistent with open caisson internal diameter, the upper end of interior ring baffle 5 adopts spot welding to be connected with the downside of upper doughnut-shaped steel plate 1, the upside of lower end and lower doughnut-shaped steel plate 2 welds completely.
Totally four of displacement transfer devices 6, wherein two are connected with the upside of upper doughnut-shaped steel plate 1, while being used for loading, transmit the displacement of upper joint open caisson 8, two other displacement transfer device passes after the through hole arranging on the inner edge of upper doughnut-shaped steel plate 1, be connected with the upside of lower doughnut-shaped steel plate 2, for transmitting the displacement of lower joint open caisson 9.Displacement transfer device is arranged symmetrically with, and near the displacement transfer device 6 at hydraulic oil pipe 7 places, can suitably be offset, and guarantees not affect being connected of hydraulic oil pipe 7 and hydraulic jack 3.
On interior ring baffle 5, be provided with hydraulic oil pipe installing hole, hydraulic oil pipe 7 can be connected with hydraulic jack 3 through this hole, and during test, hydraulic oil pump 12, is realized and being loaded to oiling by hydraulic oil pipe 7.
Load box of the present invention in the construction and installation process of open caisson self-balancing approach test site is:
The first step: open caisson is saved in the punishment of self-balancing point.
Second step: this load box is welded at place at open caisson self-balancing point.
The 3rd step: load box and correlation displacement measuring equipment assigned address are installed and fixed, sink with open caisson.
The 4th step: treat that joint open caisson built, well sinking is to assigned address and meet the soil body after the stop time, tests.
Operating principle: open caisson has been welded to monolithic load box in self-balancing point position; and correlation displacement measuring equipment and oil pipe are installed; adopt the pillar that diameter is 1cm to be protected all pipelines of measuring equipment, by oil pipe and the direct colligation of pillar on upper reinforcement skeleton until well head.Treat that well sinking is to designated depth, meet after certain stop time, can load by connected pipes, and test.
Load box is comprised of two groups of steel bushings and some hydraulic jacks, and steel bushing boring is only provided with oil cylinder below caisson wall, and this is also the core of the application of force.Relatively, with open caisson height, load box can be ignored, and inner space is larger, and in sinking process, the soil body can freely enter in open caisson substantially, and does not affect sinking, also can not cause load box damage.During test, when hydraulic jack prestrain, spot welding junction disconnects.During official testing, when hydraulic jack is pressurizeed, upper joint open caisson will move up, and lower joint open caisson moves down, and the displacement transfer device that can be connected to doughnut-shaped steel plate and lower doughnut-shaped steel plate obtains testing desired data.
Claims (4)
1. for a load box for open caisson self-balancing approach test, it is characterized in that: comprise load casing, hydraulic jack (3), the hydraulic oil pipe (7) being connected in turn with hydraulic jack (3) and hydraulic loading device (12);
Described load casing comprises doughnut-shaped steel plate (1), lower doughnut-shaped steel plate (2), outer ring baffle plate (4), interior ring baffle (5), wherein, upper doughnut-shaped steel plate (1) and lower doughnut-shaped steel plate (2) are oppositely arranged up and down, interior ring baffle (5) and outer ring baffle plate (4) are located at respectively inner side and the periphery of doughnut-shaped steel plate (1) and lower doughnut-shaped steel plate (2), and form airtight casing with upper doughnut-shaped steel plate (1) and lower doughnut-shaped steel plate (2), when hydraulic jack (3) prestrain, upper doughnut-shaped steel plate (1) and lower doughnut-shaped steel plate (2) can move up and down separately;
Described hydraulic jack (3) is located in load casing, and it is upper that the bottom of hydraulic jack (3) is connected in lower doughnut-shaped steel plate (2), and the piston of hydraulic jack (3) contacts with upper doughnut-shaped steel plate (1);
The described load box for the test of open caisson self-balancing approach also comprises for testing the displacement transfer device (6) of upper doughnut-shaped steel plate (1) and lower doughnut-shaped steel plate (2) displacement;
Described outer ring baffle plate (4) and interior ring baffle (5) respectively have two-layer, outer ring baffle plate (4) comprises outer outer ring baffle plate (4) and inner outer ring baffle plate (4) from outside to inside successively, and interior ring baffle (5) comprises outer interior ring baffle (5) and inner interior ring baffle (5) from outside to inside successively; Described refer to from outside to inside from load box external in load casing;
The external diameter of described outer outer ring baffle plate (4) equates with the external diameter of open caisson, and the internal diameter of outer interior ring baffle (5) equates in the internal diameter of open caisson;
Between the upper end of described outer outer ring baffle plate (4) and upper doughnut-shaped steel plate (1) for being fixedly connected with, between lower end and lower doughnut-shaped steel plate (2) for spot welding is connected, between the upper end of inner outer ring baffle plate (4) and upper doughnut-shaped steel plate (1), be not connected, between lower end and lower doughnut-shaped steel plate (2) for being fixedly connected with;
Between the upper end of described outer interior ring baffle (5) and upper doughnut-shaped steel plate (1) for being fixedly connected with, between lower end and lower doughnut-shaped steel plate (2) for spot welding is connected, between the upper end of inner interior ring baffle (5) and upper doughnut-shaped steel plate (1), be not connected, between lower end and lower doughnut-shaped steel plate (2) for being fixedly connected with; When hydraulic jack (3) prestrain, spot welding connects disconnection.
2. the load box for the test of open caisson self-balancing approach as claimed in claim 1, is characterized in that: on described upper doughnut-shaped steel plate (1) and lower doughnut-shaped steel plate (2), be equipped with frost boiling hole (301) and concrete perfusion conduit hole (302).
3. the load box for the test of open caisson self-balancing approach as claimed in claim 2, is characterized in that: symmetrical centered by the ring heart of described frost boiling hole (301) and the above doughnut-shaped steel plate in concrete perfusion conduit hole (302) (1) and lower doughnut-shaped steel plate (2).
4. the load box for open caisson self-balancing approach test as claimed in claim 3, it is characterized in that: hydraulic jack (3) is not less than eight, and symmetrical centered by the ring heart of above doughnut-shaped steel plate (1) and lower doughnut-shaped steel plate (2), and be interspersed with frost boiling hole (301) and concrete perfusion conduit hole (302).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310068673.6A CN103147465B (en) | 2013-03-04 | 2013-03-04 | Load box for testing open caisson with self-balancing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310068673.6A CN103147465B (en) | 2013-03-04 | 2013-03-04 | Load box for testing open caisson with self-balancing method |
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| CN103147465A CN103147465A (en) | 2013-06-12 |
| CN103147465B true CN103147465B (en) | 2014-02-12 |
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| CN201310068673.6A Expired - Fee Related CN103147465B (en) | 2013-03-04 | 2013-03-04 | Load box for testing open caisson with self-balancing method |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105064424B (en) * | 2015-08-12 | 2017-01-11 | 浙江省建筑科学设计研究院有限公司 | Self-balancing load box testing structure and method for inclined steel pipe pile of bridge |
| CN105937250B (en) * | 2015-08-12 | 2018-02-09 | 施阿丹 | Inclined steel-pipe pile self-balancing approach test structure and method of testing |
| CN105951895B (en) * | 2015-08-12 | 2018-07-17 | 广州金港水运工程设计有限公司 | Inclined steel-pipe pile self-balancing approach load box test structure and test method |
| CN107178101A (en) * | 2017-06-01 | 2017-09-19 | 浙江欧感机械制造有限公司 | Self-balancing approach annular load box |
| CN109930636B (en) * | 2019-04-09 | 2021-06-08 | 东南大学 | Device for measuring bearing capacity of deep foundation at bottom of open caisson and installation and measurement method thereof |
| CN110499791B (en) * | 2019-08-01 | 2021-05-14 | 中国海洋大学 | Method for detecting pulling-resistant bearing capacity of suction bucket |
| CN113802617B (en) * | 2021-03-15 | 2022-12-06 | 赣州博德伦科技有限公司 | Load box for self-balancing static load test and test method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3359197B2 (en) * | 1995-08-29 | 2002-12-24 | 株式会社ジオトップ | Load test method for ready-made piles and support used for it |
| CN100464176C (en) * | 2006-01-11 | 2009-02-25 | 孔清华 | Self-balancing static load measuring method for pile |
| CN201317945Y (en) * | 2008-11-18 | 2009-09-30 | 中国电力科学研究院 | Load box used for self-balancing test of dig-type foundation bearing force |
| KR101188004B1 (en) * | 2009-12-22 | 2012-10-04 | 성균관대학교산학협력단 | Loading Device For Pile Load Test |
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Application publication date: 20130612 Assignee: CHINA ENERGY ENGINEERING GROUP JIANGSU POWER DESIGN INSTITUTE CO.,LTD. Assignor: SOUTHEAST University Contract record no.: X2021980000321 Denomination of invention: A kind of load box used in open caisson self balancing test Granted publication date: 20140212 License type: Common License Record date: 20210113 |
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