CN105862944B - A kind of spread foundation full scale test device - Google Patents
A kind of spread foundation full scale test device Download PDFInfo
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- CN105862944B CN105862944B CN201610402047.XA CN201610402047A CN105862944B CN 105862944 B CN105862944 B CN 105862944B CN 201610402047 A CN201610402047 A CN 201610402047A CN 105862944 B CN105862944 B CN 105862944B
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- 238000012360 testing method Methods 0.000 title claims abstract description 73
- 230000005540 biological transmission Effects 0.000 claims abstract description 44
- 230000003068 static effect Effects 0.000 claims abstract description 32
- 239000002689 soil Substances 0.000 claims abstract description 25
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 23
- 239000010959 steel Substances 0.000 claims abstract description 23
- 238000003825 pressing Methods 0.000 claims abstract description 16
- 238000009530 blood pressure measurement Methods 0.000 claims abstract description 12
- 239000004576 sand Substances 0.000 claims description 18
- 239000011888 foil Substances 0.000 claims description 12
- 238000005259 measurement Methods 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 13
- 230000006835 compression Effects 0.000 abstract description 8
- 238000007906 compression Methods 0.000 abstract description 8
- 238000009826 distribution Methods 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 238000013142 basic testing Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 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
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method 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
- 238000004904 shortening Methods 0.000 description 1
- 238000004088 simulation Methods 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)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention discloses a kind of spread foundation full scale test device, including foundation ditch, bottom of foundation ditch is provided with the Foundation pressure measurement apparatus being embedded in back fill course, spread foundation test specimen is placed with above the Foundation pressure measurement apparatus, power transmission short column is installed at the top of the spread foundation test specimen, strain gauge means, in addition to hydraulic static pile pressing machine are provided with spread foundation test specimen, the jaw of hydraulic static pile pressing machine accompanies the power transmission plain concrete pile above power transmission short column.The present invention instead of reaction frame jack system using hydraulic static pile pressing machine, effectively improve the conventional efficient for aspect ratio concrete spread foundation full scale test, saves cost and reduces the time；Drawing should set thickness to be 4 to 10 centimetres of fine sands above steel chord type soil pressure cell, stress is distributed very well, increase test accuracy；Rigid Plates Under Compression is welded with the top of spread foundation test specimen, pillar section can be not only simulated, the uniform load for also giving biography column passes to spread foundation test specimen.
Description
Technical field
The present invention relates to a kind of concrete spread foundation design field of transmission line of electricity, and in particular to a kind of spread foundation foot
Chi experimental rig.
Background technology
At present, concrete spread foundation is one of principal mode of electric power line steel tower.During UHV transmission line is built, base
Plinth cost accounts for the 16% ~ 20% of overall investment, 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, can be significantly for economic angle
Cost is reduced, and can be accelerated the duration.But, it is wide that concrete spread foundation strictly observes step in existing national sector standard
Height is than the requirement no more than 2.5, so the height of reduction footing step, the width height ratio of steps of concrete spread foundation will exceed
Specification limit.And when using concrete spread foundation, because lower pressure is increasing, and part geological condition
Base low bearing capacity, sole plate area generally requires increase.In fact, concrete spread foundation the ratio of width to height is no more than 2.5 limit
Value is that the demand assumed based on the truncate EDS maps of foundation bottom stress is set out, and is broken through wide to concrete spread foundation step at present
The high requirement than limitation is, it is necessary to the sub-grade reaction distribution of the aspect ratio concrete spread foundation to width height ratio of steps more than 2.5
Situation carries out experimental study, preferably to recognize the mechanical characteristic and sub-grade reaction distribution rule on this class basis.
For aspect ratio concrete spread foundation, outdoor full scale test more can objectively reflect its true stress
Characteristic, still, traditional concrete spread foundation full scale test device are filled using jack counter-force frame system is set up as loading
Put, if for the concrete spread foundation of aspect ratio, needing to set up reaction frame and jack on a large scale, not only wasting
Time nor it is economical, add the cost of full scale test.
The content of the invention
The technical problems to be solved by the invention are the defects for traditional concrete spread foundation full scale test device,
A kind of spread foundation full scale test device is provided, traditional concrete spread foundation full scale test device is solved big to the ratio of width to height
, it is necessary to set up reaction frame and jack on a large scale and cause to lose time, increase experiment when 2.5 spread foundation is tested
The problem of cost.
The present invention is achieved through the following technical solutions：A kind of spread foundation full scale test device, including foundation ditch, the foundation ditch
Bottom is provided with above the Foundation pressure measurement apparatus being embedded in back fill course, the Foundation pressure measurement apparatus and is placed with extension
It is provided with the top of basic test specimen, the spread foundation test specimen on power transmission short column, spread foundation test specimen and is provided with strain gauge means,
Also include hydraulic static pile pressing machine, the jaw of the hydraulic static pile pressing machine accompanies the plain coagulation of power transmission above power transmission short column
Native stake.In the prior art, in order to objectively detect the mechanical characteristic of concrete spread foundation and sub-grade reaction distribution rule, typically
Full scale test is all used, traditional concrete spread foundation full scale test uses loading equipemtn for reaction frame and jack, still,
Concrete spread foundation to aspect ratio, i.e., the concrete spread foundation shorter than general concrete spread foundation, floor space is big,
Carry out full scale test when, traditional concrete spread foundation full scale test loading system then need large area build reaction frame and
Jack, not only loses time, and increases experimentation cost, makes the efficiency of full scale test and reduces.In order to solve the above problems,
The invention provides a kind of device that full scale test is carried out to the spread foundation of aspect ratio concrete, the device uses hydraulic static
Pile press machine is as loading device, and the axial pressure or eccentricity pressure acted in Practical Project at the top of concrete foundation can use liquid
The vertical static pressure that pressure static pile press is produced is simulated, hydraulic static pile pressing machine have compared with reaction frame possess conveniently moving, into
This is low, construction when noiseless, without friction, free of contamination advantage, the time for not only shortening full scale test also a saving and test into
This.Power transmission plain concrete pile is clamped by the jaw of hydraulic static pile pressing machine, power transmission plain concrete pile bottom passes through short to power transmission
Column top imposed load, so as to spread foundation test specimen imposed load, be arranged on the strain gauge means on spread foundation test specimen
The strain that spread foundation test specimen occurs can be precisely measured out, the Foundation pressure measurement of spread foundation test specimen bottom is arranged on
Device can obtain the sub-grade reaction distribution of spread foundation test specimen, by above-mentioned data just can to concrete spread foundation by
Force characteristic, strain regime and sub-grade reaction distribution are analyzed, to judge whether concrete spread foundation the ratio of width to height can exceed
2.5 limit value.
Further, at the top of the power transmission short column and power transmission plain concrete pile bottom is provided with size identical groove, institute
State and pressure sensor is provided with groove, the pressure sensor is connected with piezometry instrument.When power transmission short column top and biography
When power plain concrete pile bottom is contacted, the groove inner casing of formation sets pressure sensor, and the size of pressure sensor is preferably and recessed
Groove size matches, and the pressure sensor in loading can be avoided to be moved, set after pressure sensor, pass through external pressure
Force detector device can survey the size of every grade of load, be easy to the controlled loading speed in loading procedure to make load stable.In addition,
Pressure sensor can also be arranged between the jaw of hydraulic static pile pressing machine and power transmission plain concrete pile, power transmission short column is with extending
Between basic test specimen, lie in a horizontal plane in inside power transmission plain concrete pile or power transmission short column.
Further, same power transmission short column diameter identical rigidity is provided between the power transmission short column and spread foundation test specimen
Pressing plate.One piece of Rigid Plates Under Compression suitable with power transmission short column size is welded at the top of spread foundation test specimen, Rigid Plates Under Compression can not only be used
To simulate pillar section, also act as by pass column to uniform load pass to the effect of spread foundation test specimen.
Further, the strain gauge means include foil gauge, and the foil gauge is connected with static strain measuring instrument.Root
According to the ratio of width to height of spread foundation test specimen, foil gauge is reasonably set around spread foundation test specimen, foil gauge is transferred data to
External strain gauge, by strain gauge it is observed that spread foundation test specimen institute after the load transmitted by top
The strain of generation.Foil gauge when in use, it is necessary to first it is levelling on concrete, and with acetone by need monitor position clean do
Only.
Further, the static strain measuring instrument uses DH3816 static strain measuring instrument softwares.Use static strain
Measuring instrument software automatic record data and can be analyzed in computer, so as to reduce the workload of operating personnel.
Further, C10 concrete cushions are provided between the spread foundation test specimen and back fill course.C10 concrete
The uniform load of spread foundation test specimen bottom is applied to bottom by bed course, is easy to gather the counter-force of spread foundation test specimen bottom.
Further, the Foundation pressure measurement apparatus is steel chord type soil pressure cell, the steel chord type soil pressure cell connection
There is vibrating wire frequency measurer.The Foundation pressure measuring system device that steel chord type soil pressure cell and vibrating wire frequency measurer are constituted can be with
Measure the counter-force of spread foundation test specimen bottom.
Further, fine sand is provided with above the steel chord type soil pressure cell, the thickness of the fine sand is 4 to 10 centimetres.
Be found by experiment that, when test two kinds of different materials between stress when, be covered with above steel chord type soil pressure cell thickness 4 to
10 centimetres of fine sand can avoid stress concentration, be easy to stress distribution.
Further, fine sand is provided with below the steel chord type soil pressure cell, the thickness of the fine sand is 2 to 5 centimetres.For
The reason for preventing bottom of foundation ditch soil property influences test accuracy, between bottom of foundation ditch and steel chord type soil pressure cell is equipped with 2 to 5
Centimetre fine sand.
The present invention compared with prior art, has the following advantages and advantages：
1st, the present invention instead of reaction frame and jack system using hydraulic static pile pressing machine, be effectively improved 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 is drawn by practice should set thickness to be 4 to 10 centimetres thin above steel chord type soil pressure cell
Sand, makes stress be distributed very well, adds the precision of experiment；
3rd, the present invention welds the block size Rigid Plates Under Compression suitable with power transmission column dimension at the top of spread foundation test specimen, not only may be used
For simulation pillar section, also act as by pass column to uniform load pass to the effect of spread foundation test specimen.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding the embodiment of the present invention, constitutes one of the application
Point, do not constitute 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 accompanying drawing：
1- hydrostatic pile press machines, 2- power transmission plain concrete piles, 3- pressure sensors, 4- piezometry instruments, 5- power transmissions
Short column, 6- Rigid Plates Under Compressions, 7- static strain measuring instruments, 8- vibrating wire frequency measurers, 9- foil gauges, 10- steel chord type soil pressure cells,
11- spread foundation test specimens, 12- concrete cushions, 13- fine sands, 14- back fill courses, 15- fine sands.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, with reference to embodiment and accompanying drawing, to this
Invention is described in further detail, and exemplary embodiment and its explanation of the invention is only used for explaining the present invention, does not make
For limitation of the invention.
Embodiment
As shown in figure 1, a kind of spread foundation full scale test device of the invention, including foundation ditch, the bottom of foundation ditch is provided with
It is embedded in above the Foundation pressure measurement apparatus in back fill course 14, the Foundation pressure measurement apparatus and is placed with spread foundation test specimen
11, the top of spread foundation test specimen 11, which is provided with power transmission short column 5, spread foundation test specimen 11, is provided with strain gauge means,
Also include hydraulic static pile pressing machine 1, the jaw of the hydraulic static pile pressing machine 1 accompanies the power transmission element positioned at the top of power transmission short column 5
Concrete-pile 2.Further, to be provided with size identical recessed the top of the power transmission short column 5 and the bottom of power transmission plain concrete pile 2
Pressure sensor 3 is provided with groove, the groove, the pressure sensor 3 is connected with piezometry instrument 4.Further, institute
State and the same diameter identical Rigid Plates Under Compression 6 of power transmission short column 5 is provided between power transmission short column 5 and spread foundation test specimen 11.Further,
The strain gauge means include foil gauge 9, and the foil gauge 9 is connected with static strain measuring instrument 7.Further, it is described quiet
State strain gauge 7 uses DH3816 static strain measuring instrument softwares.Further, the spread foundation test specimen 11 and backfill
Concrete cushion 12 is provided between layer 14.Further, the Foundation pressure measurement apparatus is steel chord type soil pressure cell 10, institute
State steel chord type soil pressure cell 10 and be connected with vibrating wire frequency measurer 8.Further, the top of steel chord type soil pressure cell 10 is set
There is fine sand 13, the thickness of the fine sand 13 is 4 to 10 centimetres.Further, the lower section of steel chord type soil pressure cell 10 is provided with
Fine sand, the thickness of the fine sand is 2 to 5 centimetres.During using the present apparatus, it is 2 centimetres to spread a layer thickness in bottom of foundation ditch first
Fine sand, steel chord type soil pressure cell 10, steel chord type soil pressure cell are placed according to the concrete condition of spread foundation test specimen 11 on fine sand
10 external type vibration wire frequency testers 8, then the space filled up with back fill course 14 between steel chord type soil pressure cell 10, back fill course
14 are higher by 5 centimetres than steel chord type soil pressure cell 10, and laying depth is 5 centimetres of fine sand 13 on string formula soil pressure cell 10, afterwards
C10 concrete cushions 12 are set in the top of back fill course 14, spread foundation test specimen 11, root are placed on C10 concrete cushions 12
Foil gauge 9 is placed according to the concrete condition of the size of spread foundation test specimen 11 is uniform on spread foundation test specimen 11, foil gauge 9 is external quiet
State strain gauge 7, static strain measuring instrument 7 uses DH3816 static strain measuring instrument softwares, and can record and analyze automatically should
Become data, the top of spread foundation test specimen 11 is provided with Rigid Plates Under Compression 6, and power transmission short column 5, power transmission short column 5 are installed in the top of Rigid Plates Under Compression 6
Top sets fluted, placement force sensor 3 in groove, and pressure sensor 3 is connected with piezometry instrument 4, during measurement, is made
The jaw of hydraulic static pile pressing machine 1 clamps power transmission plain concrete pile 2, and the bottom of power transmission plain concrete pile 2 sets fluted, adjusts liquid
The position of the pressure jaw of static pile press 1 makes the groove of the bottom of power transmission plain concrete pile 2 be directed at the groove at the top of power transmission short column 5, leads to
Crossing the data that hydraulic static pile pressing machine 1 and piezometry instrument measure gradually increases load, automatic by static strain measuring instrument
Record and analysis spread foundation test specimen 11 are surveyed with the deformation produced by the increase of load, then by type vibration wire frequency tester 8
The bottom of spread foundation test specimen 11 produces counter-force, by these data objectively detect the mechanical characteristic of concrete spread foundation with
Sub-grade reaction distribution rule.
Above-described embodiment, has been carried out further to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc. all should be included
Within protection scope of the present invention.
Claims (7)
1. a kind of spread foundation full scale test device, including foundation ditch, the bottom of foundation ditch, which is provided with, is embedded in back fill course（14）In
Foundation pressure measurement apparatus, be placed with spread foundation test specimen above the Foundation pressure measurement apparatus（11）, the extension base
Plinth test specimen（11）Top is provided with power transmission short column（5）, spread foundation test specimen（11）On be provided with strain gauge means, its feature exists
In, in addition to hydraulic static pile pressing machine（1）, the hydraulic static pile pressing machine（1）Jaw accompany positioned at power transmission short column（5）Top
Power transmission plain concrete pile（2）；
The power transmission short column（5）With spread foundation test specimen（11）Between be provided with same power transmission short column（5）Diameter identical is rigidly pressed
Plate（6）；
The spread foundation test specimen（11）With back fill course（14）Between be provided with concrete cushion（12）.
2. a kind of spread foundation full scale test device according to claim 1, it is characterised in that the power transmission short column（5）
Top and power transmission plain concrete pile（2）Bottom is provided with size identical groove, the groove and is provided with pressure sensor
（3）, the pressure sensor（3）It is connected with piezometry instrument（4）.
3. a kind of spread foundation full scale test device according to claim 1, it is characterised in that the strain gauge means
Including foil gauge（9）, the foil gauge（9）It is connected with static strain measuring instrument（7）.
4. a kind of spread foundation full scale test device according to claim 3, it is characterised in that the static strain measurement
Instrument（7）Use DH3816 static strain measuring instrument softwares.
5. a kind of spread foundation full scale test device according to claim 1, it is characterised in that the Foundation pressure measurement
Device is steel chord type soil pressure cell（10）, the steel chord type soil pressure cell（10）It is connected with vibrating wire frequency measurer（8）.
6. a kind of spread foundation full scale test device according to claim 5, it is characterised in that the steel chord type soil pressure
Box（10）Top is provided with fine sand（13）, the fine sand（13）Thickness be 4 to 10 centimetres.
7. a kind of spread foundation full scale test device according to claim 5, it is characterised in that the steel chord type soil pressure
Box（10）Lower section is provided with fine sand, and the thickness of the fine sand is 2 to 5 centimetres.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610402047.XA CN105862944B (en) | 2016-06-08 | 2016-06-08 | A kind of spread foundation full scale test device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610402047.XA CN105862944B (en) | 2016-06-08 | 2016-06-08 | A kind of spread foundation full scale test device |
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| Publication Number | Publication Date |
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| CN105862944A CN105862944A (en) | 2016-08-17 |
| CN105862944B true CN105862944B (en) | 2017-09-22 |
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| CN201610402047.XA Active CN105862944B (en) | 2016-06-08 | 2016-06-08 | A kind of spread foundation full scale test device |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107340383A (en) * | 2017-07-18 | 2017-11-10 | 国网四川省电力公司经济技术研究院 | Device and preparation method for the measurement of concrete spread foundation sub-grade reaction distribution |
| CN107271281B (en) * | 2017-07-18 | 2019-10-18 | 国网四川省电力公司经济技术研究院 | Experimental rig and method for the double-deck armored concrete spread foundation uplift test |
| CN116043928A (en) * | 2021-12-09 | 2023-05-02 | 长江师范学院 | Building foundation pile safety monitoring system |
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| CN1232116A (en) * | 1998-04-16 | 1999-10-20 | 叶长生 | Ground anchor heaping test pile method |
| CN102828525A (en) * | 2012-08-16 | 2012-12-19 | 国核电力规划设计研究院 | Foundation structure of power transmission line tower |
| CN102966125A (en) * | 2012-10-10 | 2013-03-13 | 中国电力科学研究院 | Transmission and transformation project foundation load test system |
| CN103995097A (en) * | 2014-06-06 | 2014-08-20 | 中国科学院武汉岩土力学研究所 | Test method and test device for simulating stratum deformation caused by pipe jacking construction |
| CN205669219U (en) * | 2016-06-08 | 2016-11-02 | 国家电网公司 | A kind of spread foundation full scale test device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4378244B2 (en) * | 2004-08-23 | 2009-12-02 | 株式会社竹中工務店 | Loading test method for piled raft foundation |
| JP2012255305A (en) * | 2011-06-09 | 2012-12-27 | Takenaka Komuten Co Ltd | Foundation load testing method |
-
2016
- 2016-06-08 CN CN201610402047.XA patent/CN105862944B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1232116A (en) * | 1998-04-16 | 1999-10-20 | 叶长生 | Ground anchor heaping test pile method |
| CN102828525A (en) * | 2012-08-16 | 2012-12-19 | 国核电力规划设计研究院 | Foundation structure of power transmission line tower |
| CN102966125A (en) * | 2012-10-10 | 2013-03-13 | 中国电力科学研究院 | Transmission and transformation project foundation load test system |
| CN103995097A (en) * | 2014-06-06 | 2014-08-20 | 中国科学院武汉岩土力学研究所 | Test method and test device for simulating stratum deformation caused by pipe jacking construction |
| CN205669219U (en) * | 2016-06-08 | 2016-11-02 | 国家电网公司 | A kind of spread foundation full scale test device |
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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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