CN211596858U - Pile foundation static load experimental device suitable for narrow space - Google Patents
Pile foundation static load experimental device suitable for narrow space Download PDFInfo
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- CN211596858U CN211596858U CN201922234471.XU CN201922234471U CN211596858U CN 211596858 U CN211596858 U CN 211596858U CN 201922234471 U CN201922234471 U CN 201922234471U CN 211596858 U CN211596858 U CN 211596858U
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Abstract
The utility model discloses a pile foundation static load experimental device suitable for narrow space, which is arranged between a test pile on a foundation and a structural beam on a structural column, and comprises a loading device and a testing device connected with the loading device; the loading device comprises a supporting piece, a load column and a jack with a pressurizing device, the jack is arranged at the upper end of the test pile, the load column is arranged between the jack and the supporting piece, and the upper end of the supporting piece is abutted against the lower end face of the structural beam; the load column is formed by detachably fixing a plurality of steel sleeves; the testing device comprises a reference beam arranged on the side edge of the loading device, a displacement sensor arranged on the reference beam and a static load testing analyzer respectively connected with the pressurizing device and the displacement sensor. The utility model discloses simple structure is applicable to narrow and small space, makes things convenient for assembling and dismantling in the experimentation, circulated use.
Description
Technical Field
The utility model belongs to the technical field of the construction, especially, relate to a pile foundation static load experimental apparatus suitable for narrow and small space.
Background
After the construction of the pile foundation is completed, a static load test is required to test whether the ultimate bearing capacity of the pile foundation can meet the design requirement. Currently, the most common static load tests are the pile loading method and the anchor pile method. The pile loading method is that an experimental platform is erected in the center of a test pile, and a sand bag or a concrete block is stacked on the platform; the anchor pile method is to pour a counter-force beam before the test is started so as to provide counter-force.
For example, chinese patent publication No. CN104532884A discloses a method for testing static load and pressing pile of foundation pile by eccentric loading method outside buttress, which comprises placing a jack on the foundation pile, selecting a proper main beam to be placed on the jack, placing the buttress in a direction parallel to the main beam, placing secondary beams on the buttress, placing all the secondary beams on a uniform plane, uniformly and symmetrically placing, hoisting the loading material on the secondary beams, supplying oil to the jack, and performing static load test or pile pressing construction.
Chinese patent publication No. CN109518734A discloses an anchor pile method static load test detection device, which includes a static load test pile and a jack disposed above the static load test pile, wherein a main beam is horizontally disposed above the jack, at least two secondary beams perpendicular to the main beam are horizontally disposed above the main beam, two anchor piles are respectively disposed under each secondary beam, and the anchor piles are symmetrically disposed at two sides of the main beam; a plurality of anchor bars are arranged in the middle of the anchor pile, a row of parallel connecting rods are respectively arranged on two sides of the anchor pile, the connecting rods are positioned on two sides of the secondary beam, an anchor disc is arranged between the anchor pile and the main beam, a supporting piece is arranged between the anchor disc and the anchor pile, and the upper ends of the anchor bars are fixedly connected with the anchor disc; the upper end of the connecting rod passes through the anchor box and is fixed above the secondary beam through the reinforcing steel bar fixing piece.
However, for some projects with space requirements, such as underground layer-increasing transformation underpinning pile bearing capacity detection projects, the stowage rule is obviously not suitable. Although the anchor pile method is suitable for similar projects, the counter-force beam needs to be poured before the experiment, and after the experiment is finished, the counter-force beam needs to be chiseled off, so that the anchor pile method cannot be recycled. Therefore, the anchor pile method has problems of being uneconomical and having a long test time.
SUMMERY OF THE UTILITY MODEL
For solving the above-mentioned problem that prior art exists, the utility model provides a pile foundation static load experimental apparatus suitable for narrow and small space, simple structure makes things convenient for assembling and dismantling in the experimentation.
A pile foundation static load experimental device suitable for narrow space is arranged between a test pile and a structural beam, wherein the structural beam is fixed on a structural column and comprises a loading device and a testing device connected with the loading device;
the loading device comprises a supporting piece, a load column and a jack with a pressurizing device, the jack is placed at the upper end of the test pile, the load column is arranged between the jack and the supporting piece, and the upper end of the supporting piece is abutted against the lower end face of the structural beam; the load column is formed by detachably fixing a plurality of steel sleeves;
the testing device comprises a reference beam arranged on the side edge of the loading device, a displacement sensor arranged on the reference beam and a static load testing analyzer respectively connected with the pressurizing device and the displacement sensor.
The utility model discloses in, support piece is T type structure, including horizontal ribbed steel and vertical shaped steel short column, be connected with the steel pipe bracing between ribbed steel and the shaped steel short column.
The loading device further comprises at least one right-angle steel hinge fixed on the structural column in a surrounding mode, wherein a horizontal steel plate is welded to the lower end of the lower-most right-angle steel hinge, and the free end of the steel plate is arranged between the supporting piece and the load column.
In order to facilitate field installation, the outer side of each steel sleeve is symmetrically provided with a handle.
And steel base plates and steel gaskets are arranged between the supporting piece and the load column, between the load column and the jack and between the jack and the test pile. The number of the steel backing plates and the steel gaskets can be adjusted, so that the requirements of different working spaces can be met.
The displacement sensor is fixed on the reference beam through the magnetic gauge stand.
Utilize the utility model discloses a method that pile foundation static load experimental apparatus carries out the static load experiment, including following step:
(1) installing a loading device and a testing device according to actual conditions on site;
(2) loading a load: controlling a pressurizing device to carry out graded loading on the test pile, and after each grade of load is applied, measuring and reading the pile top settlement amount according to the steps of 5min, 15min, 30min, 45min and 60min respectively, and then measuring and reading the pile top settlement amount every 30 min; when the settlement rate of the pile top reaches a relatively stable standard, applying the next stage of load until reaching a loading termination standard;
(3) load unloading: unloading in a grading manner, wherein each unloading amount is 2 times of the grading load during loading, and the unloading is carried out in a grading manner in an equivalent manner step by step; during unloading, maintaining each level of load for 1h, and unloading the next level of load after measuring and reading the pile top settlement amount according to 15min, 30min and 60min respectively; and after unloading to zero, measuring and reading the residual settlement of the pile top.
In the step (2), the concrete step that the settlement rate of the pile top reaches the relative stability standard is as follows: the settlement of the pile top in every 1h is not more than 0.1 mm.
The termination loading condition comprises the following steps:
a. under the action of a certain level of load, the settlement of the pile top is 2 times greater than that under the action of the previous level of load, and the pile top does not reach the relatively stable standard of settlement after 24 hours;
b. the maximum loading value of the design requirement is reached and the pile top settlement reaches a relatively stable standard;
c. floor, structural columns or structural beams develop cracks.
In the load loading process, when a p-s curve displayed on a static load test analyzer is in a slow deformation type, the load can be loaded until the total settlement of the pile top reaches 60-80 mm.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the utility model discloses a static load experimental apparatus all constitutes through simple component, can assemble at the scene, after the experiment finishes, can demolish it to transport next project, have simple structure, advantage such as transportation convenience.
2. The utility model discloses a static load experimental apparatus can provide the counter-force of triplex, and the first part is the frictional force between right angle steel hinge and the structure post, and the second part is the counter-force that structure roof beam and floor provided, and the last part is the dead weight counter-force of concrete block. The counter force is applied step by step, and the counter forces of the first part and the second part are applied firstly; when the counter force of the two parts is insufficient, the concrete blocks can be stacked at the position right above the test pile area so as to provide enough counter force.
Drawings
Fig. 1 is the utility model relates to a pile foundation static load experimental apparatus's overall structure schematic diagram suitable for narrow and small space.
In the figure: concrete block 1, structural beam 2, floor 3, ribbed steel 4, steel short column 5, steel pipe bracing 6, steel backing plate 7, steel washer 8, steel sleeve 9, jack 10, reference beam 11, magnetism gauge stand 12, displacement sensor 13, test pile 14, pressure device 15, static load test analyzer 16, right angle steel hinge 17, structural column 18, steel sheet 19.
Detailed Description
The invention will be described in further detail with reference to the following figures and examples, which are intended to facilitate the understanding of the invention without limiting it.
As shown in figure 1, the static load experiment device for the pile foundation suitable for the narrow space is integrally arranged between a test pile 14 on a foundation and a structural beam 2 on a structural column 18, and comprises a loading device and a testing device connected with the loading device.
The loading device comprises a support member, a load column and a jack 10 with a pressurizing device 15, wherein the jack 10 is arranged at the upper end of the test pile 14. The load column is formed by detachably fixing a plurality of steel sleeves 9, and is arranged between a jack 10 and a support piece.
Support piece is T type structure, including horizontal ribbed steel 4 and vertical shaped steel short column 5, is connected with steel pipe bracing 6 between ribbed steel 4 and the shaped steel short column 5, and the installation is accomplished the back, and ribbed steel 4 offsets with the lower terminal surface of structural beam 2.
Two right angle steel hinges 17 are fixed on the structural column 18 in an encircling manner, wherein a horizontal steel plate 19 is welded at the lower end of the lower right angle steel hinge, and the free end of the steel plate 19 is arranged between the supporting piece and the load column. During installation, the steel short column 5 can be firstly placed on the steel plate 19 to complete primary fixing, and then the load column and the jack 10 are installed below the steel plate 19.
The utility model provides a testing arrangement is including setting up at the benchmark roof beam 11 of loading device side, installing displacement sensor 13 on benchmark roof beam 11 and the static load test analysis appearance 16 of being connected with pressure device 15 and displacement sensor 13 respectively. The displacement sensor 13 is fixed to the reference beam 11 via a magnetic gauge stand 12.
In order to facilitate field installation, a handle is symmetrically arranged on the outer side of each steel sleeve 9.
The static load experimental device of the utility model can provide three counter forces, the first part is the friction between the right angle steel hinge 17 and the structural column 18; the second part is the counterforce provided by the structural beam 2 and the floor slab 3; the last part is the self-weight reaction force of the concrete block 1. The counter force of the utility model is applied step by step, and the counter force of the first part and the second part is applied firstly; when the reaction force of the two parts is insufficient, the concrete block 1 can be stacked at a position right above the test pile area to provide sufficient reaction force. Meanwhile, whether cracks exist or not can be observed at the periphery of the floor slab 3 stacked on the upper layer, and a judgment standard is provided for finishing the experiment.
The utility model discloses a static load experimental apparatus constitutes through simple component, can assemble at the scene, after the experiment finishes, can demolish it to transport next project. Wherein, the field assembly process is as follows:
s1, assembling right-angle steel hinges 17 at the tops of the structural columns 18;
s2, forming a support part of a T-shaped structure consisting of ribbed steel sections 4, a steel section short column 5 and a steel pipe inclined strut 6;
s3, placing the structure formed in the step S2 on the steel plate 19 of the right-angle steel hinge 17, and ensuring that the structure is on the same vertical line with the center of the test pile 14;
s4, placing a steel washer 8 above the test pile 14, placing a steel backing plate 7 above the steel washer 8, and placing a jack 10 above the steel backing plate 7;
s5, placing a steel backing plate 7 above the jack 10; a steel gasket 8 is arranged above the steel base plate 7; a steel sleeve 9 is arranged above the steel washer 8;
s6, placing a steel gasket 8 above the steel sleeve 9; placing a steel backing plate 7 above the steel washer 8, contacting the structure formed in the step S2, and enabling the steel backing plate to be on the same vertical line with the center of the test pile 14;
s7, assembling the jack 10 and the pressurizing device 15;
s8, assembling the reference beam 11, and erecting the magnetic gauge stand 12 on the reference beam 11;
s9, the displacement sensor 13 is fixed to the magnetic gauge stand 12, and the displacement sensor 13 and the pressure device 15 are connected to the static load test analyzer 16.
When the pile foundation static load experiment device is used for carrying out experiments, the pile foundation static load experiment device comprises a loading step, a loading termination step and an unloading step.
A loading step:
1. the loading is carried out in a grading way, and the step-by-step equivalent loading is adopted; the grading load is preferably 1/10 of the maximum loading value or the estimated limit bearing capacity, wherein the 1 st grade loading capacity can be 2 times of the grading load;
2. after each level of load is applied, measuring and reading the pile top settlement amount according to the time of 5min, 15min, 30min, 45min and 60min respectively, and measuring and reading the pile top settlement amount every 30min later;
3. and (3) testing the pile settlement relatively stable standard: the settlement of the pile top within every 1h is not more than 0.1 mm;
4. when the settlement rate of the pile top reaches a relatively stable standard, the next stage of load can be applied;
terminating the loading standard:
1. under the action of a certain stage of load, the settlement of the pile top is 5 times greater than that under the action of the previous stage of load, and the total settlement of the pile top exceeds 40 mm;
2. under the action of a certain level of load, the settlement of the pile top is 2 times greater than that under the action of the previous level of load, and the pile top does not reach the settlement relatively stable standard after 24 hours (item 3 of the loading step);
3. the maximum loading value of the design requirement is reached and the pile top settlement reaches a relatively stable standard (item 3 of the loading step);
4. floor, structural columns and beams have cracks;
when the p-s curve (load-sedimentation curve) is in slow deformation, the total sedimentation of the pile top can be loaded to 60-80 mm;
unloading:
1. unloading is carried out in a grading manner, the unloading capacity of each grade is 2 times of the grading load during loading, and the unloading is carried out in a grading manner step by step in an equivalent manner;
2. during unloading, each level of load is maintained for 1h, and the next level of load can be unloaded after the settlement of the pile top is measured and read according to the 15min, 30min and 60min respectively; and after the pile is unloaded to zero, measuring and reading the residual settlement of the pile top.
The above-mentioned embodiment is to the technical solution and the beneficial effects of the present invention have been described in detail, it should be understood that the above is only the specific embodiment of the present invention, not used for limiting the present invention, any modification, supplement and equivalent replacement made within the principle scope of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A pile foundation static load experimental device suitable for narrow space is arranged between a test pile and a structural beam, and the structural beam is fixed on a structural column;
the loading device comprises a supporting piece, a load column and a jack with a pressurizing device, the jack is placed at the upper end of the test pile, the load column is arranged between the jack and the supporting piece, and the upper end of the supporting piece is abutted against the lower end face of the structural beam; the load column is formed by detachably fixing a plurality of steel sleeves;
the testing device comprises a reference beam arranged on the side edge of the loading device, a displacement sensor arranged on the reference beam and a static load testing analyzer respectively connected with the pressurizing device and the displacement sensor.
2. The pile foundation static load experimental device suitable for narrow and small space of claim 1, characterized in that, support piece is T type structure, including horizontal ribbed steel and vertical shaped steel short column, be connected with the steel pipe bracing between ribbed steel and the shaped steel short column.
3. The pile foundation static load experimental device suitable for narrow and small space of claim 1, characterized in that, loading device still include around fixing at least one right angle steel hinge on the structure post, wherein, the lower extreme of below right angle steel hinge is welded with the horizontally steel sheet, the free end setting of steel sheet is between support piece and load post.
4. The pile foundation static load experiment device suitable for the narrow space according to claim 1, wherein a handle is symmetrically arranged on the outer side of each steel sleeve.
5. The pile foundation static load experiment device suitable for the narrow space of claim 1, wherein a steel backing plate and a steel washer are arranged between the supporting member and the load column, between the load column and the jack, and between the jack and the test pile.
6. The pile foundation static load experimental device suitable for the narrow space of claim 1, wherein the displacement sensor is fixed on the reference beam through a magnetic gauge stand.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922234471.XU CN211596858U (en) | 2019-12-11 | 2019-12-11 | Pile foundation static load experimental device suitable for narrow space |
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| CN201922234471.XU CN211596858U (en) | 2019-12-11 | 2019-12-11 | Pile foundation static load experimental device suitable for narrow space |
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| CN211596858U true CN211596858U (en) | 2020-09-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110847257A (en) * | 2019-12-11 | 2020-02-28 | 台州学院 | Pile foundation static load experiment device and method suitable for narrow space |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110847257A (en) * | 2019-12-11 | 2020-02-28 | 台州学院 | Pile foundation static load experiment device and method suitable for narrow space |
| CN110847257B (en) * | 2019-12-11 | 2021-05-11 | 台州学院 | Pile foundation static load experiment device and method suitable for narrow space |
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Granted publication date: 20200929 |