CN202099819U - Treatment device of vertical static load test pile head - Google Patents
Treatment device of vertical static load test pile head Download PDFInfo
- Publication number
- CN202099819U CN202099819U CN 201120156649 CN201120156649U CN202099819U CN 202099819 U CN202099819 U CN 202099819U CN 201120156649 CN201120156649 CN 201120156649 CN 201120156649 U CN201120156649 U CN 201120156649U CN 202099819 U CN202099819 U CN 202099819U
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- bearing plate
- jack
- pile crown
- static load
- bearing
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Abstract
The utility model relates to a treatment device of a vertical static load test pile head, which comprises a pressure bearing plate. A jack is installed above the pressure bearing plate, and the treatment device of the vertical static load test pile head is characterized in that a pressure bearing hoop of the pile head is installed below the pressure bearing plate through a leveling device. Level meters are symmetrically distributed on two sides of the jack on the pressure bearing plate, and a load sensor arranged above the jack is fixed on an I beam and connected with a frequency meter. The pressure bearing hoop of the pile head, the pressure bearing plate, the jack, the load sensor and the I beam are located on the same axis. A dial indicator measuring rod clamping groove is arranged on a reference stake, and a dial indicator is fixed on the reference stake. The treatment device of the vertical static rod test pile head can avoid eccentric pressing of a pile and accurately control pile pressing force, and the dial indicator can accurately measure vertical deformation of the pile, thereby guaranteeing accuracy of static load test data.
Description
Technical field
The utility model relates to a kind of vertical static load test pile crown treating apparatus, particularly a kind ofly avoids an eccentric compression, accurately controls the vertical static load test pile crown treating apparatus of vertical deformation that pile driving pressure and dial gage accurately measure stake.
Background technology
Static load test be confirm in many methods of ultimate bearing capacity of single pile the most directly, the most basic; The method that reliability is the highest can obtain parameters such as loading transfer, pile side resistance, end resistance, pile body axle power, load one sedimentation relation through burying testing element underground.The loading counterforce device of static load test is according to different anchoring pile crossbeam counterforce device, ballast platform counterforce device, anchoring pile ballast associating counterforce device, the earth anchor counterforce devices of being divided into of field condition and pile body type.
When carrying out static load test, occur following bearing capacity and the inaccurate situation of settling data of causing easily: the center of making a concerted effort of (1) jack does not overlap the stressed eccentric compression that occurs of pile body with the stake axis; (2) owing to the top surface inclination out-of-flatness of stake, bearing plate is prone to out-of-level in installation and process of the test, thereby causes the slippage and the read untrue of the dial gage measuring staff on the bearing plate.Engineering practice show avoid an eccentric compression, accurately control pile driving pressure and dial gage accurately measure the stake vertical deformation be the key point of static load test; Particularly important for the minor diameter plain concrete pile; Because the inner moment of flexure that produces of pile body during minor diameter concrete pile eccentric compression; Be prone to further cause pile body generation buckling instability to destroy; Bearing capacity when more difficult test pile side holds soil strength not enough with stake causes the bearing capacity data inaccurate, can not objectively judge the stressing conditions and the pile quality of pile body under the actual forced status.
Pile driving pressure confirms and the main oil pressure gauge that adopts of observation that manometric precision is low, the stake less relatively to the test tonnage, the more difficult accurate response pile driving pressure of oil pressure gauge at present.Like range is the oil pressure gauge of 50t; Its minimum scale is 2MPa, and the pile driving pressure of its reaction is 1t, and the pressure less than 1t in pressurization and the ftercompction process mainly leans on observation personnel estimation; Be necessary to be provided with load sensor; Through the variation of load sensor frequency, accurately confirm the variation of pile driving pressure, and in time carry out ftercompction and add unloading.
Also do not have a kind of efficient ways to prevent to load off-centre, accurately control the vertical deformation that pile driving pressure and dial gage accurately measure stake in the static load test engineering practice at present, need the problem that a kind of technical measures solve present existence of seeking badly.
The utility model content
The purpose of the utility model is exactly to overcome the above-mentioned defective that present static load test device exists, and solves some problems that exist in the present static loading test, improves the accuracy of static load test, develops a kind of vertical static load test pile crown treating apparatus.
In order to realize above-mentioned purpose, utility model has adopted following technical scheme.
Vertical static load test pile crown treating apparatus; Comprise bearing plate; Jack is installed above bearing plate, is it is characterized in that below bearing plate, through levelling device pile crown pressure-bearing cuff being installed, the bilateral symmetry of jack is arranged level gauge on bearing plate; The top of jack is provided with load sensor, and load sensor is fixed on the i iron and with frequency recorder and is connected; Pile crown pressure-bearing cuff, bearing plate, jack, load sensor, i iron are in same axis.
Aforesaid vertical static load test pile crown treating apparatus, described pile crown pressure-bearing cuff is downward opening casing, opens bolt hole at the sidewall of casing, pile crown pressure-bearing casing and pile crown pass through bolt.
Dial gage measuring staff draw-in groove is set on the bearing plate, is convenient to fixedly dial gage, prevent that the dial gage measuring staff from sliding, dial gage is fixed on the reference pegs.
Open bolt hole at pile crown pressure-bearing casing sidewall, pile crown pressure-bearing casing and pile crown pass through bolt.
The jack retainer ring is set on the bearing plate, and with the bearing plate coaxial line, jack is fixed on the bearing plate through the jack retainer ring.
The load sensor fastening devices is set on i iron and connects load sensor fastening devices and bearing plate coaxial line through set bolt.
The utility model can be avoided an eccentric compression, accurately control the vertical deformation that pile driving pressure and dial gage accurately measure stake, thereby has guaranteed the accuracy of static load test data.
Description of drawings
Fig. 1 is vertical static load test pile crown treating apparatus.
Among the figure: 1-i iron, 2-load sensor fastening devices, 3-set bolt, 4-load sensor, 5-dial gage and support, 6-jack, 7-jack retainer ring, 8-bearing plate, 9-bar formula level gauge, 10-pressure-bearing foot screw, 11-pile crown pressure-bearing casing, 12-set bolt 2,13-stake, 14-stake axis, 15-datum line beam, 16-reference pegs, 17-dial gage fixed point.
The specific embodiment
With reference to shown in Figure 1; Vertical static load test pile crown treating apparatus comprises pile crown pressure-bearing casing 11, pressure-bearing leveling foot screw 10, bearing plate 8, bar formula level gauge 9, jack retainer ring 7, jack 6, load sensor 4, load sensor fastening devices 2, datum line beam 15, reference pegs 16.
Wherein, the center line of pile crown pressure-bearing casing 11, bearing plate 8, jack retainer ring 7, load sensor fastening devices 2 overlaps with the axis 14 of stake 13, can guarantee the center of effort's line and the pile body dead in line of jack and load sensor 4.
Pile crown pressure-bearing casing 11 openings are 0.5m highly down, are processed by steel pipe, and its internal diameter is slightly larger than the external diameter of pile body 13 to be measured, and sidewall is provided with two-layer corner bolt hole, and every layer of three corner bolt hole are fixed in pile crown 13 through bolt 12, and keep closely contact.
Pile crown pressure-bearing casing 11 is connected through the pressure-bearing foot screw with bearing plate 8, and the pressure-bearing foot screw is provided with three, on the bearing plate platform, be equilateral triangle and arrange that the length of side of its equilateral triangle is slightly less than the length of side that connects equilateral triangle in the stake, but its center overlaps with pile center.
Place bar formula level gauge 9 on the bearing plate 8, be used for monitoring the levelness of bearing plate 8 in installation and entire test, prevent an eccentric compression, two bar formula level gauges 9 are arranged in the both sides of bearing plate long side direction jack 6 symmetrically.The major-minor bubble of bar formula level gauge 9 shows the pressure-bearing surface level when all placed in the middle, and is excessive if find that bubble departs from the static load test process, can regulate pressure-bearing foot screw 10 through spanner and make bubble placed in the middle.
Adopt frequency recorder in the process of the test, the change of frequency of overall process monitoring load sensor 4 cooperates oil pressure gauge accurately to measure pile driving pressure.Load sensor fastening devices 2 closely is connected with i iron 1 through set bolt 3.
Use is following:
1) cutter falls the crushable layer and the weak concrete at a top, and all soil of stake of excavating a top certain limit exposes pile crown 13 and polishes;
2) shop, stake top layer of fine sand;
3) pile crown pressure-bearing casing 11 is enclosed within on the pile crown, and with set bolt 12 fixedly pile crown 13 and pressure-bearing casing 11;
4) jack 6 is positioned in the jack retainer ring 7;
5) the installed load sensor fastening device 2, through spanner adjustment set bolt 3, make closely to be connected with i iron 1;
6), be positioned in the load sensor fastening devices 2 with load sensor 4;
7) through spanner adjustment pressure-bearing leveling foot screw 10, make that the major-minor bubble of bar formula level gauge 9 is all placed in the middle;
8) set reference pegs 16, place datum line beam 15, on datum line beam, settle dial gage 5, dial gage measuring staff end is placed in dial gage fixed point 19;
9) jack 6 prestrains make each parts of device closely contact;
10) the adjustment dial gage makes zero;
11) original frequency of test load sensor 4;
12) as requested, by load sensor 4 and the oil pressure gauge control pile driving pressure that mutually combines, calibrate loads and unloading;
13) in time adjust pressure-bearing leveling foot screw 10 in the process of the test, guarantee bearing plate 8 levels.
Claims (5)
1. vertical static load test pile crown treating apparatus; Comprise bearing plate; Jack is installed above bearing plate, is it is characterized in that below bearing plate, through levelling device pile crown pressure-bearing cuff being installed, the bilateral symmetry of jack is arranged level gauge on bearing plate; The top of jack is provided with load sensor, and load sensor is fixed on the i iron and with frequency recorder and is connected; Fixing dial gage on reference pegs, pile crown pressure-bearing cuff, bearing plate, jack, load sensor, i iron are in same axis.
2. vertical static load test pile crown treating apparatus according to claim 1 is characterized in that described pile crown pressure-bearing cuff is downward opening casing, opens bolt hole at the sidewall of casing, and pile crown pressure-bearing casing and pile crown pass through bolt.
3. vertical static load test pile crown treating apparatus according to claim 1 is characterized in that being provided with on the bearing plate jack retainer ring, and with the bearing plate coaxial line, jack is fixed on the bearing plate through the jack retainer ring.
4. vertical static load test pile crown treating apparatus according to claim 1 is characterized in that on i iron, being provided with the load sensor fastening devices and connects load sensor fastening devices and bearing plate coaxial line through set bolt.
5. vertical static load test pile crown treating apparatus according to claim 1 is characterized in that on bearing plate, being provided with dial gage measuring staff draw-in groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120156649 CN202099819U (en) | 2011-05-17 | 2011-05-17 | Treatment device of vertical static load test pile head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120156649 CN202099819U (en) | 2011-05-17 | 2011-05-17 | Treatment device of vertical static load test pile head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202099819U true CN202099819U (en) | 2012-01-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120156649 Expired - Lifetime CN202099819U (en) | 2011-05-17 | 2011-05-17 | Treatment device of vertical static load test pile head |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202099819U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102277884A (en) * | 2011-05-17 | 2011-12-14 | 浙江大学城市学院 | Device for treating pile head for vertical static load test and construction method thereof |
| CN103147470A (en) * | 2013-03-28 | 2013-06-12 | 中国建筑第八工程局有限公司 | Cast-in-place pile static test pile head and construction method thereof |
| CN109138005A (en) * | 2018-08-30 | 2019-01-04 | 中建七局第四建筑有限公司 | A kind of construction technology for existing load-bearing engineering pile detection structural measure |
-
2011
- 2011-05-17 CN CN 201120156649 patent/CN202099819U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102277884A (en) * | 2011-05-17 | 2011-12-14 | 浙江大学城市学院 | Device for treating pile head for vertical static load test and construction method thereof |
| CN102277884B (en) * | 2011-05-17 | 2013-05-22 | 浙江大学城市学院 | Device for treating pile head for vertical static load test and construction method thereof |
| CN103147470A (en) * | 2013-03-28 | 2013-06-12 | 中国建筑第八工程局有限公司 | Cast-in-place pile static test pile head and construction method thereof |
| CN103147470B (en) * | 2013-03-28 | 2016-03-30 | 中国建筑第八工程局有限公司 | Castinplace pile static loading test pile head and construction method thereof |
| CN109138005A (en) * | 2018-08-30 | 2019-01-04 | 中建七局第四建筑有限公司 | A kind of construction technology for existing load-bearing engineering pile detection structural measure |
| CN109138005B (en) * | 2018-08-30 | 2021-05-07 | 中建七局第四建筑有限公司 | Construction process for existing load-bearing engineering foundation pile detection structure measures |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120104 |
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| CX01 | Expiry of patent term |