CN105908790B - A kind of loading connecting structure for spread foundation full scale test - Google Patents
A kind of loading connecting structure for spread foundation full scale test Download PDFInfo
- Publication number
- CN105908790B CN105908790B CN201610400690.9A CN201610400690A CN105908790B CN 105908790 B CN105908790 B CN 105908790B CN 201610400690 A CN201610400690 A CN 201610400690A CN 105908790 B CN105908790 B CN 105908790B
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- column
- short column
- pile
- bracket
- spread foundation
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- 238000012360 testing method Methods 0.000 title claims abstract description 28
- 230000005540 biological transmission Effects 0.000 claims abstract description 28
- 230000003068 static effect Effects 0.000 claims abstract description 16
- 238000003825 pressing Methods 0.000 claims abstract description 12
- 241000826860 Trapezium Species 0.000 claims abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 238000009826 distribution Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/42—Foundations for poles, masts or chimneys
Landscapes
- Engineering & Computer Science (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)
- Structural Engineering (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Abstract
The invention discloses a kind of loading connecting structure for spread foundation full scale test, including loading device, loading device is hydraulic static pile pressing machine, loading device jaw accompanies power transmission concrete-pile, short column is provided with below power transmission concrete-pile, short column side is fixed with bracket column, the shape of the bracket column is right-angled trapezium, wherein, the bottom of bracket column and the side of short column connect, the right angle waist of bracket column and the upper surface of short column are located in same level, the short column, built-in fitting is all connected with above bracket column, pressure sensor is provided in the built-in fitting, the external piezometry instrument of pressure sensor.The present invention adds bracket column in short column side so that loading device not only can implement axle center loading to spread foundation, can also implement bias-load；Reaction frame jack system is replaced using hydraulic static pile pressing machine, the conventional efficient for aspect ratio spread foundation full scale test is effectively improved, saves cost and reduce the time.
Description
Technical field
The present invention relates to a kind of systems for spread foundation full scale test, and in particular to one kind is used for spread foundation full size
The loading connecting structure of experiment.
Background technology
At present, spread foundation is one of principal mode of electric power line steel tower.During UHV transmission line is built, foundation cost
The 16% ~ 20% of overall investment is accounted for, therefore the optimization design on basis plays an important role for saving the duration with cost.
The cutting depth of foundation soil is reduced, that is, reduces the height of footing step, it can be significantly for economic angle
Cost is reduced, and can be accelerated the duration.But spread foundation strictly observes in existing national sector standard width height ratio of steps not
Requirement more than 2.5, so reducing the height of footing step, the width height ratio of steps of spread foundation will be more than specification limit.And
And when spread foundation is used, since lower pressure is increasing and part geological condition foundation bearing capacity is low, basic bottom
Plate suqare generally requires to increase.In fact, limit value of the spread foundation the ratio of width to height no more than 2.5 is truncate based on foundation bottom stress
What the demand that EDS maps assume was set out, the requirement to the limitation of spread foundation width height ratio of steps at present is broken through, it is necessary to spread foundation
Sub-grade reaction distribution situation carry out experimental study, preferably to recognize mechanical characteristic and the sub-grade reaction distribution rule on basis.
For spread foundation, outdoor full scale test more can objectively reflect its true mechanical characteristic, still, tradition
Spread foundation full scale test loading connecting structure cause loading device can only realize to spread foundation apply axle center loading, nothing
Method implements bias-load to spread foundation, and full scale test and actual conditions is caused to have deviation, reduce test accuracy.
The content of the invention
The defects of technical problems to be solved by the invention are for conventional Extension basis full scale test loading connecting structure,
A kind of loading connecting structure for spread foundation full scale test is provided, axle center can only be applied to spread foundation by solving loading device
The problem of full scale test precision caused by loading is low.
The present invention is achieved through the following technical solutions：A kind of loading connecting structure for spread foundation full scale test, bag
Loading device is included, the loading device jaw accompanies power transmission concrete-pile, is provided with short column below the power transmission concrete-pile, institute
It states short column side and is fixed with bracket column.In the prior art, in order to objectively detect the mechanical characteristic of spread foundation and Foundation pressure
The regularity of distribution, generally all using full scale test, traditional spread foundation full scale test uses reaction frame and jack system conduct
Loading equipemtn loads short column, and passes through short column and load is applied in spread foundation, by being arranged in spread foundation
Strain-Sensing device and spread foundation bottom Foundation pressure measuring device to the mechanical characteristic and Foundation pressure of spread foundation
The regularity of distribution is analyzed, and still, traditional spread foundation full scale test only considered to be applied by loading device to spread foundation
Axle center is added to load, and has ignored the importance of bias-load.The present invention in power transmission short column side by setting bracket column so that adds
Can not only spread foundation be applied axle center loading but also can apply bias-load by carrying to put, and substantially increase test accuracy so that
The analysis result of full scale test and actual conditions more close to.
Further, the loading device is hydraulic static pile pressing machine.In order to break through conventional Extension footing step the ratio of width to height
For 2.5 limit value, the present invention needs to carry out full scale test for spread foundation of the width height ratio of steps more than 2.5.Width height ratio of steps
Spread foundation more than 2.5 is shorter than general spread foundation, floor space is big, so when carrying out full scale test, traditional full scale test
It is middle that jack counter-force frame system is built as what loading device needed large area using jack counter-force frame system, when not only wasting
Between, and experimentation cost is increased, make the efficiency of full scale test reduce.To solve the above-mentioned problems, which uses hydraulic static
The axial pressure or eccentricity pressure that power pile press machine is acted on as loading device, in Practical Project at the top of concrete foundation can be used
The vertical static pressure that hydraulic static pile pressing machine generates is simulated, hydraulic static pile pressing machine have compared with reaction frame possess conveniently moving,
Noiseless, without friction, free of contamination advantage during at low cost, construction, the time for not only shortening full scale test also as save experiment
Cost.It, can easily conversion axes loading or bias-load in addition, by the jaw of movable hydraulic static pile press.
Further, the shape of the bracket column is right-angled trapezium, wherein, the bottom of bracket column and the side of short column connect
It connects, the right angle waist of bracket column and the upper surface of short column are located in same level.Bracket column uses the setting of right-angled trapezium not only
The use of arrangement of reinforcement in concrete is saved, and improves bracket column to bear the intensity of load.
Further, the short column, bracket column top are all connected with built-in fitting.By setting built-in fitting, behaviour can be facilitated
Make personnel and add other devices or component in built-in fitting in operation from now on.
Further, the built-in fitting is located on the central axes of short column, bracket column.Built-in fitting is separately positioned on short column and ox
On the central axes of leg column so that the load being applied to during loading on built-in fitting can be transferred uniformly on short column or bracket column.
Further, pressure sensor, the external piezometry instrument of pressure sensor are provided in the built-in fitting.
Pressure sensor is set, the size of every grade of load can be surveyed by external piezometry instrument, convenient in loading procedure
Control loading velocity stablizes load.
Further, it is provided with wedge block between the built-in fitting and pressure sensor.In built-in fitting and pressure sensor
Gap filled with wedge block, can level fix pressure sensor, so as not to generate displacement in loading procedure.
Further, set at the power transmission concrete-pile bottom centre fluted.The power transmission concrete-pile bottom is set
Groove is put, and groove size is close with pressure sensor dimensions, it is therefore an objective to a bottom groove be made to block pressure sensor completely, realized
Centering to ensure that the two contact is good, more directly transfers load, power transmission concrete-pile is sandwiched in the folder of hydraulic static pile pressing machine
In stake jaw, up and down movably, power transmission concrete-pile bottom groove is made to align with the pressure sensor being placed in built-in fitting, from
And spread foundation is reliably loaded.
Compared with prior art, the present invention it has the following advantages and advantages：
1st, the present invention is effectively improved using hydraulic static pile pressing machine instead of reaction frame and jack system for big
The conventional efficient of the ratio of width to height concrete spread foundation full scale test, saves cost and reduces the time；
2nd, the present invention adds bracket column in short column side so that loading device not only can implement axle center to spread foundation
Loading, can also implement bias-load；
3rd, the present invention is provided with wedge block between built-in fitting and pressure sensor so that pressure sensor is fixed on pre-buried
In part, loading ground accuracy is improved, pressure sensor on power transmission concrete-pile bottom groove alignment short column when reducing loading
Time.
Description of the drawings
Attached drawing described herein is used for providing further understanding the embodiment of the present invention, forms one of the application
Point, do not form the restriction to the embodiment of the present invention.In the accompanying drawings：
Fig. 1 is schematic structural view of the invention.
Mark and corresponding parts title in attached drawing：
1- power transmission concrete-piles, 2- hydraulic static pile pressing machines, 3- pressure sensors, 4- short columns, 5- built-in fittings, 6- brackets
Column, 7- arrangements of reinforcement.
Specific embodiment
Understand to make the object, technical solutions and advantages of the present invention clearer, with reference to embodiment and attached drawing, to this
Invention is described in further detail, and exemplary embodiment of the invention and its explanation are only used for explaining the present invention, do not make
For limitation of the invention.
Embodiment
As shown in Figure 1, the present invention is a kind of loading connecting structure for spread foundation full scale test, filled including loading
It puts, the loading device jaw accompanies power transmission concrete-pile 1, and 1 lower section of power transmission concrete-pile is provided with short column 4, described short
4 side of column is fixed with bracket column 6.Further, the loading device is hydraulic static pile pressing machine 2.Further, the bracket
The shape of column 6 is right-angled trapezium, wherein, the bottom of bracket column 6 is connected with the side of short column 4, the right angle waist and short column of bracket column 6
4 upper surface is located in same level.Further, the short column 4,6 top of bracket column are all connected with built-in fitting 5.Into one
Step ground, the built-in fitting 5 are located on the central axes of short column 4, bracket column 6.Further, it is provided with pressure in the built-in fitting 5
Sensor 3, the 3 external piezometry instrument of pressure sensor.Further, between the built-in fitting 5 and pressure sensor 3
It is provided with wedge block.Further, set at 1 bottom centre of power transmission concrete-pile fluted.During using the present apparatus, first
After treating that spread foundation, short column 4 and bracket column 6 all pour, 2 admission of hydraulic static pile pressing machine, treat its traveling to short column 4 or
After 5 scope of built-in fitting of bracket column 6, stop and the position of fixed hydraulic static pile press 2, afterwards in short column 4 or bracket column 6
Placement force sensor 3 on built-in fitting 5, and filled in built-in fitting 5 and the gap of pressure sensor 3 with wedge block, level is solid
Surely pressure sensor 3 is lived, prefabricated power transmission concrete-pile 1, power transmission concrete are sling with the lifting arm of hydraulic static pile pressing machine 2
There is a groove set in advance at the stake bottom of stake 1, size and 3 adjoining dimensions of pressure sensor, then by power transmission concrete-pile 1 into
Row centering makes a bottom groove center be overlapped with 3 center of pressure sensor, clamps pile body with jaw after completion centering, slowly lands,
Prepare to preload, then slowly move down power transmission concrete-pile 1, a bottom groove is made to be contacted with 3 top of pressure sensor, contact
Mark is that 3 number of degrees of pressure sensor have significant change, if 3 number of degrees of pressure sensor change unobvious, and power transmission concrete-pile 1
Part outside bottom groove contacts with short column 4 or bracket column 6, then moves up power transmission concrete-pile 1；Again in pressure sensing
Pitch-based sphere gasket on built-in fitting 5 under device 3, then placement force sensor 3 are fixed, and are then moved down power transmission concrete-pile 1, are made
1 bottom groove of power transmission concrete-pile is contacted with 3 top of pressure sensor, if 3 number of degrees of pressure sensor are still unchanged, by power transmission
Concrete-pile 1 moves up, and continues to increase gasket until 3 number of degrees of pressure sensor change, and keeps power transmission concrete-pile 1
3 number of degrees of pressure sensor are returned to zero, start to load in a state that pressure sensor 3 has number of degrees variation in position.
Above-described specific embodiment has carried out the purpose of the present invention, technical solution and advantageous effect further
It is described in detail, it should be understood that the foregoing is merely the specific embodiments of the present invention, is not intended to limit the present invention
Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution, improvement and etc. done should all include
Within protection scope of the present invention.
Claims (3)
1. a kind of loading connecting structure for spread foundation full scale test, including loading device, the loading device jaw folder
There is power transmission concrete-pile（1）, the power transmission concrete-pile（1）Lower section is provided with short column（4）, which is characterized in that the short column（4）
Side is fixed with bracket column（6）；The loading device is hydraulic static pile pressing machine（2）；The short column（4）, bracket column（6）Top
All it is connected with built-in fitting（5）；The bracket column（6）Shape for right-angled trapezium, wherein, bracket column（6）Bottom and short column（4）
Side connection, bracket column（6）Right angle waist and short column（4）Upper surface be located in same level；The built-in fitting（5）Position
In short column（4）, bracket column（6）Central axes on；The built-in fitting（5）In be provided with pressure sensor（3）, the pressure sensing
Device（3）External piezometry instrument.
A kind of 2. loading connecting structure for spread foundation full scale test according to claim 1, which is characterized in that institute
State built-in fitting（5）With pressure sensor（3）Between be provided with wedge block.
A kind of 3. loading connecting structure for spread foundation full scale test according to claim 1, which is characterized in that institute
State power transmission concrete-pile（1）It is set at bottom centre fluted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610400690.9A CN105908790B (en) | 2016-06-08 | 2016-06-08 | A kind of loading connecting structure for spread foundation full scale test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610400690.9A CN105908790B (en) | 2016-06-08 | 2016-06-08 | A kind of loading connecting structure for spread foundation full scale test |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105908790A CN105908790A (en) | 2016-08-31 |
| CN105908790B true CN105908790B (en) | 2018-05-25 |
Family
ID=56750798
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610400690.9A Active CN105908790B (en) | 2016-06-08 | 2016-06-08 | A kind of loading connecting structure for spread foundation full scale test |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11133004A (en) * | 1997-10-31 | 1999-05-21 | Tokyo Soil Reserch:Kk | Method and device for evaluating soundness of underground concrete structure such as cast-ins-place concrete pile |
| KR20050080018A (en) * | 2005-07-01 | 2005-08-11 | (주)씨에스티개발 | Structure of basement pile for building |
| CN2905910Y (en) * | 2005-09-01 | 2007-05-30 | 赵海生 | Counterforce device for use in pile foundation static loading test |
| CN204356823U (en) * | 2014-12-22 | 2015-05-27 | 中国有色金属工业昆明勘察设计研究院 | A kind ofly pull out the loading test device with horizontal sliding simultaneously for rock anchorage base |
| CN205012377U (en) * | 2015-07-29 | 2016-02-03 | 浙江大学 | One -dimensional level circulation load loading device |
| CN205839819U (en) * | 2016-06-08 | 2016-12-28 | 国家电网公司 | A kind of loading connecting structure for spread foundation full scale test |
-
2016
- 2016-06-08 CN CN201610400690.9A patent/CN105908790B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11133004A (en) * | 1997-10-31 | 1999-05-21 | Tokyo Soil Reserch:Kk | Method and device for evaluating soundness of underground concrete structure such as cast-ins-place concrete pile |
| KR20050080018A (en) * | 2005-07-01 | 2005-08-11 | (주)씨에스티개발 | Structure of basement pile for building |
| CN2905910Y (en) * | 2005-09-01 | 2007-05-30 | 赵海生 | Counterforce device for use in pile foundation static loading test |
| CN204356823U (en) * | 2014-12-22 | 2015-05-27 | 中国有色金属工业昆明勘察设计研究院 | A kind ofly pull out the loading test device with horizontal sliding simultaneously for rock anchorage base |
| CN205012377U (en) * | 2015-07-29 | 2016-02-03 | 浙江大学 | One -dimensional level circulation load loading device |
| CN205839819U (en) * | 2016-06-08 | 2016-12-28 | 国家电网公司 | A kind of loading connecting structure for spread foundation full scale test |
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| Publication number | Publication date |
|---|---|
| CN105908790A (en) | 2016-08-31 |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20161010 Address after: 100000 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant after: State Grid Corporation of China Applicant after: State Grid Sichuan Electric Power Corporation Applicant after: ECONOMIC AND TECHNOLOGY RESEARCH INSTITUTE, STATE GRID SICHUAN ELECTRIC POWER CO., LTD. Applicant after: Tongji University Applicant after: Become capital electricity power engineering design Co., Ltd Address before: 610000 Sichuan, Chengdu City, Jinjiang District, No. 3 long street, building 4 Applicant before: ECONOMIC AND TECHNOLOGY RESEARCH INSTITUTE, STATE GRID SICHUAN ELECTRIC POWER CO., LTD. Applicant before: Tongji University Applicant before: Become capital electricity power engineering design Co., Ltd Applicant before: State Grid Corporation of China |
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