CN220978135U - Collapsible loess settlement measuring device in pile foundation negative friction resistance test - Google Patents
Collapsible loess settlement measuring device in pile foundation negative friction resistance test Download PDFInfo
- Publication number
- CN220978135U CN220978135U CN202322716309.8U CN202322716309U CN220978135U CN 220978135 U CN220978135 U CN 220978135U CN 202322716309 U CN202322716309 U CN 202322716309U CN 220978135 U CN220978135 U CN 220978135U
- Authority
- CN
- China
- Prior art keywords
- pile foundation
- measuring device
- collapsible loess
- resistance test
- experimental box
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 38
- 239000002689 soil Substances 0.000 claims abstract description 32
- 238000002474 experimental method Methods 0.000 abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 26
- 238000005259 measurement Methods 0.000 description 11
- 238000001914 filtration Methods 0.000 description 8
- 238000006073 displacement reaction Methods 0.000 description 6
- 238000004062 sedimentation Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The utility model provides a collapsible loess settlement measuring device in a pile foundation negative friction resistance test, which belongs to the technical field of collapsible loess pile foundation experiments and comprises an experiment box, wherein a yellow soil layer is horizontally arranged in the experiment box, a plurality of test piles are vertically inserted on the yellow soil layer, a water inlet pipe is arranged on the left side of the experiment box, a support rod is vertically arranged on the right side of the upper surface of the experiment box, a telescopic rod is horizontally arranged at the upper end of the support rod, and a distance sensor is arranged at the bottom of the left end of the telescopic rod.
Description
Technical Field
The utility model belongs to the technical field of collapsible loess pile foundation experiments, and particularly relates to a collapsible loess settlement measuring device in a pile foundation negative friction resistance test.
Background
The pile foundation is laid in the soil body, the upper load acts on the pile end pile soil to generate relative displacement under the general condition, the sedimentation rate of the pile surrounding soil is far smaller than the sedimentation rate of the pile, the side friction resistance born by the pile is upward, namely the pile side friction resistance, however, under certain special conditions, the sedimentation rate of the pile surrounding soil is far greater than the sedimentation rate of the pile, the side friction resistance born by the pile is downward, namely the negative friction resistance, and the negative friction resistance has a serious weakening effect on the pile foundation, and particularly in the collapsible loess area.
The collapsible loess is widely distributed in China, is mainly distributed in most areas of Shanxi, shaanxi and Gansu and in the southwest of yellow river, and is found in most areas of Ningxia, qinghai and Hebei, and has low humidity and high porosity in parts of Xinjiang, shandong, liaoning and the like, and has higher general strength and smaller compressibility when not soaked by water, but after soaked by water, the soil structure can be quickly damaged, larger additional sinking is generated, the strength is quickly reduced, and the pile body damage, uneven sinking of the pile foundation and the like can be caused by the downward drag force generated by the negative frictional resistance of the pile side in pile foundation engineering, so that the safety of a building is seriously influenced.
At present, in an experiment for detecting resistance change of pile foundation negative frictional resistance in collapsible loess, when measuring settlement displacement of collapsible loess, a measuring device is lacking, an experimenter simply measures once before settlement by a distance meter and then measures once after settlement, but places where two measurements cannot be kept at the same level for multiple measurements, so that measured data of collapsible loess settlement have errors and inaccuracy, thereby affecting accuracy of a final experiment result, and therefore, a collapsible loess settlement measuring device in pile foundation negative frictional resistance test is required to solve the problem.
Disclosure of utility model
The utility model aims to provide a collapsible loess settlement measuring device in a pile foundation negative frictional resistance test.
In order to achieve the above purpose, the utility model provides a collapsible loess settlement measuring device in a pile foundation negative frictional resistance test, which comprises an experiment box, wherein a loess layer is horizontally arranged in the experiment box, a plurality of test piles are vertically inserted into the loess layer, the lower ends of the test piles are fixed at the middle upper part in the loess layer, a water inlet pipe is arranged on the left side of the experiment box and positioned below the test piles, a supporting rod is vertically arranged on the right side of the upper surface of the experiment box, a telescopic rod is horizontally arranged at the upper end of the supporting rod, and a distance sensor is arranged at the bottom of the left end of the telescopic rod.
Further, vertical standing grooves are formed in the right side face of the experiment box, the supporting rods are located in the standing grooves and are connected in a sliding mode, fixing buckles are fixed to the upper end of the standing grooves, fixing holes are formed in the fixing buckles, a plurality of screw holes are formed in the right side of the outer side wall of the supporting rods, the screw rods are matched with the screw holes, and when the fixing holes are aligned with one screw hole, the screw rods penetrate through the fixing holes and are screwed into the screw holes.
Further, two fixing holes are formed in the fixing buckle.
Further, the upper end of the supporting rod is rotationally connected with a connecting block, and the right end of the telescopic rod is fixedly connected with the connecting block through a bolt.
Further, the telescopic rod is telescopic in multiple sections.
Further, a water filtering layer is horizontally arranged below the yellow soil layer, the water filtering layer is located at the bottom of the experimental box, and a water outlet pipe is arranged at the position of the water filtering layer on the right side of the experimental box.
Further, a stress strain sensor is arranged on the test pile.
The utility model has the advantages that: according to the utility model, the fixed supporting rods are arranged, so that an experimenter can measure displacement by using the distance sensor at the same level each time, and the telescopic rods matched with the supporting rods are arranged, so that the experimenter can measure the distance at different positions at the same level each time, the measurable position range of the distance sensor is enlarged, the measured data error of collapsible loess settlement displacement is reduced, the measured data is more accurate, and the measuring accuracy of the distance sensor and the accuracy of the final experimental result are improved.
The utility model will now be described in detail with reference to the drawings and examples.
Drawings
Fig. 1 is a schematic diagram of the structure of the present utility model.
Fig. 2 is an enlarged view of the structure at a of the present utility model.
Fig. 3 is a side view of the structure of the present utility model.
Fig. 4 is a top view of the structure of the present utility model.
Reference numerals illustrate: 1. an experiment box; 2. a layer of yellow soil; 3. testing piles; 4. a water inlet pipe; 5. a support rod; 6. a telescopic rod; 7. a distance sensor; 8. a placement groove; 9. fixing the retaining ring; 10. a fixing hole; 11. a screw hole; 12. a screw; 13. a connecting block; 14. a water filtering layer; 15. and a water outlet pipe.
Detailed Description
The following detailed description, structural features and functions of the present utility model are provided with reference to the accompanying drawings and examples in order to further illustrate the technical means and effects of the present utility model to achieve the predetermined objects.
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "aligned," "overlapping," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operate in a specific orientation, and therefore should not be construed as limiting the present utility model.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second" may include one or more such features, either explicitly or implicitly; in the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.
Example 1
The embodiment provides a collapsible loess settlement measuring device in pile foundation negative friction resistance test as shown in fig. 1-4, including experiment case 1, the level is equipped with yellow soil layer 2 in experiment case 1, vertical inserting on the yellow soil layer 2 is equipped with a plurality of test piles 3, the lower extreme of test pile 3 is fixed in the well upper portion in yellow soil layer 2, the left side of experiment case 1 is equipped with inlet tube 4, inlet tube 4 is located test pile 3 below, the vertical bracing piece 5 that is equipped with in right side of experiment case 1 upper surface, bracing piece 5 upper end level is equipped with telescopic link 6, telescopic link 6 and bracing piece 5 rotate and are connected, the bottom of telescopic link 6 left end is equipped with distance sensor 7.
Further, vertical standing groove 8 has been seted up to experiment case 1 right flank, and bracing piece 5 is located the sliding connection of standing groove 8, and experiment case 1 right flank is located standing groove 8 upper end department and is fixed with fixed buckle 9, has seted up fixed orifices 10 on the fixed buckle 9, and a plurality of screw holes 11 have been seted up to the right side department of bracing piece 5 lateral wall, still include with screw 11 assorted screw rod 12, when fixed orifices 10 and one of them screw 11 align, screw rod 12 passes fixed orifices 10 and screw in screw 11.
Further, two fixing holes 10 are formed in the fixing buckle.
Further, the upper end of the supporting rod 5 is rotatably connected with a connecting block 13, and the right end of the telescopic rod 6 is fixedly connected with the connecting block 13 through a bolt.
Further, the telescopic rod 6 is telescopic in multiple sections.
Further, a water filtering layer 14 is horizontally arranged below the yellow soil layer 2, the water filtering layer 14 is positioned at the bottom in the experiment box 1, and a water outlet pipe 15 is arranged at the position of the water filtering layer 14 on the right side of the experiment box 1
Through the drainage layer 14 and outlet pipe 15 that set up, when the water yield that flows into in the yellow soil layer 2 from inlet tube 4 is great, the water that gets out can permeate downwards in the yellow soil layer 2 and flow into drainage layer 14 for unnecessary water in the yellow soil layer 2 carries out primary separation through drainage layer 14, flows to the bottom of experimental box 1, then discharges and unifies and gathers together through the outlet pipe 15 again, is convenient for the next experiment and carries out the cyclic utilization.
Further, a stress strain sensor is arranged on the test pile 3.
The working process comprises the following steps:
Before the experiment, arranging a yellow soil layer 2 and a water filtering layer 14 in an experiment box 1, sequentially inserting a plurality of test piles 3 on the yellow soil layer 2 according to a quincuncial shape, wherein the distance between every two adjacent test piles 3 is 1.5-2 meters, and then constructing a test site for completing the negative friction resistance detection of the test piles 3 in collapsible loess settlement;
During experiments, the supporting rod 5 moves upwards in the chute, then passes through the fixing hole 10 of the fixing buckle 9 through the screw rod 12, is screwed into the screw hole 11 on the supporting rod 5 to be in threaded connection, fixes the supporting rod 5, and then performs multiple distance measurement at different positions of the same horizontal height above the yellow soil layer 2 through the distance sensor 7 on the telescopic rod 6, so that the measurement range is enlarged, the measurement accuracy is improved, after measurement is completed and recorded, the water valve at the water inlet pipe 4 is opened, water flows into the yellow soil layer 2 from the water inlet pipe 4, the yellow soil layer 2 is sunk downwards after the water flowing out is absorbed, and the stress caused by the yellow soil layer 2 in the sinking and settlement of the test pile 3 is used as an input signal through the stress strain sensor on the test pile 3 and is converted into an output signal to be transmitted to the computer system for recording;
When the yellow soil layer 2 is sunk downwards after absorbing water flowing out of the water inlet pipe 4, the stress strain sensor on the test pile 3 takes the stress caused by the sinking of the yellow soil layer 2 on the test pile 3 as an input signal, and converts the input signal into an output signal to be transmitted to a computer system for recording; after the yellow soil layer 2 subsides, the distance of the subsidence of the yellow soil layer 2 is measured for a plurality of times through the position of the distance sensor 7 at the same horizontal height as the first time, then the distance is transmitted to a computer system for recording, after the measurement is completed, the distance of the subsidence of the yellow soil layer 2 is recorded through the first measurement distance-the second measurement distance = the subsidence of the yellow soil layer 2, wherein the supporting rod 5 is rotationally connected with the telescopic rod 6 through the connecting block 13, when an experimenter does not need to use the distance sensor 7 on the telescopic rod 6, the bolt fixedly connected between the telescopic rod 6 and the connecting block 13 can be detached, the telescopic rod 6 is separated from the connecting block 13, the telescopic rod 6 is independently retracted and protected, then the supporting rod 5 moves downwards along a sliding chute and is retracted into the sliding chute, and the distance sensor 7 can be used for carrying out multi-section extension for the self-section, so that the measuring accuracy of the distance sensor 7 is improved, and the measured data is more accurate.
After the measurement data in the stress strain sensor and the measurement data in the distance sensor 7 are measured and recorded in a computer system, the real-time collected data are simulated through a computer algorithm, and then the simulation test of the negative frictional resistance detection of the test pile 3 in collapsible loess settlement is completed.
In summary, the utility model can ensure that the experimenter can use the distance sensor 7 to measure displacement at the same level each time by arranging the fixed supporting rod 5, and can also ensure that the experimenter can measure distance at different positions at the same level each time by arranging the telescopic rod 6 matched with the supporting rod 5, thereby enlarging the measurable position range of the distance sensor 7, reducing the measured data error of collapsible loess settlement displacement, ensuring that the measured data is more accurate, and improving the measuring accuracy of the distance sensor 7 and the accuracy of the final experimental result.
The foregoing is a further detailed description of the utility model in connection with the preferred embodiments, and it is not intended that the utility model be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the utility model, and these should be considered to be within the scope of the utility model.
Claims (7)
1. Collapsible loess subsides measuring device among pile foundation negative friction resistance test, its characterized in that: including experimental box (1), the level is equipped with yellow soil layer (2) in experimental box (1), vertical inserting is equipped with a plurality of test stake (3) on yellow soil layer (2), the lower extreme of test stake (3) is fixed well upper portion in yellow soil layer (2), the left side of experimental box (1) is equipped with inlet tube (4), inlet tube (4) are located experimental stake (3) below, the vertical bracing piece (5) that is equipped with in right side of experimental box (1) upper surface, bracing piece (5) upper end level is equipped with telescopic link (6), the bottom of telescopic link (6) left end is equipped with distance sensor (7).
2. The collapsible loess settlement measuring device in a pile foundation negative frictional resistance test as set forth in claim 1, wherein: the experimental box is characterized in that a vertical placing groove (8) is formed in the right side face of the experimental box (1), the supporting rod (5) is located in the placing groove (8) and is connected in a sliding mode, the right side face of the experimental box (1) is located at the upper end of the placing groove (8) and is fixedly provided with a fixing buckle ring (9), a fixing hole (10) is formed in the fixing buckle ring (9), a plurality of screw holes (11) are formed in the right side of the outer side wall of the supporting rod (5), the experimental box further comprises a screw rod (12) matched with the screw holes (11), and when the fixing hole (10) is aligned with one of the screw holes (11), the screw rod (12) penetrates through the fixing hole (10) and is screwed into the screw holes (11).
3. The collapsible loess settlement measuring device in pile foundation negative frictional resistance test as set forth in claim 2, wherein: two fixing holes (10) are formed in the fixing buckle.
4. The collapsible loess settlement measuring device in pile foundation negative frictional resistance test as set forth in claim 2, wherein: the upper end of the supporting rod (5) is rotationally connected with a connecting block (13), and the right end of the telescopic rod (6) is fixedly connected with the connecting block (13) through a bolt.
5. The collapsible loess settlement measuring device in pile foundation negative friction resistance test as set forth in claim 4, wherein: the telescopic rod (6) is telescopic in multiple sections.
6. The collapsible loess settlement measuring device in a pile foundation negative frictional resistance test as set forth in claim 1, wherein: the below level of yellow soil layer (2) is equipped with drainage layer (14), drainage layer (14) are located the bottom in experimental box (1), experimental box (1) right side is located drainage layer (14) department is equipped with outlet pipe (15).
7. The collapsible loess settlement measuring device in a pile foundation negative frictional resistance test as set forth in claim 1, wherein: and a stress-strain sensor is arranged on the test pile (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322716309.8U CN220978135U (en) | 2023-10-10 | 2023-10-10 | Collapsible loess settlement measuring device in pile foundation negative friction resistance test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322716309.8U CN220978135U (en) | 2023-10-10 | 2023-10-10 | Collapsible loess settlement measuring device in pile foundation negative friction resistance test |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220978135U true CN220978135U (en) | 2024-05-17 |
Family
ID=91040980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322716309.8U Active CN220978135U (en) | 2023-10-10 | 2023-10-10 | Collapsible loess settlement measuring device in pile foundation negative friction resistance test |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220978135U (en) |
-
2023
- 2023-10-10 CN CN202322716309.8U patent/CN220978135U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11634881B2 (en) | Bridge foundation scouring monitoring sensor and monitoring data analysis method thereof | |
| CN103968883B (en) | Mud detection method and mud survey meter | |
| CN108280969A (en) | A kind of high slope surface deformation monitoring and warning system and its method for early warning | |
| CN104328810A (en) | Improved method for detecting bearing capacity of precast pipe-pile single-pile foundation | |
| CN202793533U (en) | Riverway water gauge | |
| CN220978135U (en) | Collapsible loess settlement measuring device in pile foundation negative friction resistance test | |
| CN107144261A (en) | A kind of pile tube perpendicularity deviation rapid measurement device and detection method | |
| CN206847567U (en) | A kind of automatic rock soil device for detecting deformation | |
| CN201876257U (en) | Dam foundation settlement meter for extra-large measuring range dam | |
| CN203271724U (en) | Multifunctional hole detector | |
| CN209513126U (en) | A kind of three-dimensional total force measuring device of experiment | |
| CN103471978B (en) | Face dam leakage monitoring of structures on deep covering layer | |
| CN220978133U (en) | Water delivery structure for pile foundation negative friction resistance test in collapsible loess | |
| CN110174206A (en) | A kind of three-dimensional total power measuring device and measuring method of experiment | |
| CN206721943U (en) | A kind of pile foundation displacement auxiliary detection device | |
| CN215447825U (en) | Slope displacement testing arrangement in centrifugal model test | |
| CN214832528U (en) | Bridge and tunnel engineering construction soil layer subsides and uses detection device | |
| CN220978136U (en) | Water filtering structure for pile foundation negative friction resistance test in collapsible loess | |
| CN220978134U (en) | Negative frictional resistance detection test device for pile foundation in collapsible loess | |
| CN210104815U (en) | Novel soft soil foundation settlement detection device | |
| CN220819146U (en) | High-precision water level measuring device | |
| CN208847293U (en) | SEA LEVEL VARIATION rate devices in a kind of quick tested for leaks water cofferdam | |
| CN113090250A (en) | Hole detector for cast-in-situ bored pile | |
| CN212620437U (en) | Auxiliary device for underwater abnormal shape measurement | |
| CN201778322U (en) | Earth pressure gauge embedding device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |