CN218813913U - Pile foundation negative frictional resistance model test device based on lever loading - Google Patents
Pile foundation negative frictional resistance model test device based on lever loading Download PDFInfo
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- CN218813913U CN218813913U CN202221709969.2U CN202221709969U CN218813913U CN 218813913 U CN218813913 U CN 218813913U CN 202221709969 U CN202221709969 U CN 202221709969U CN 218813913 U CN218813913 U CN 218813913U
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- 238000012360 testing method Methods 0.000 title claims abstract description 29
- 239000002689 soil Substances 0.000 claims abstract description 41
- 238000004088 simulation Methods 0.000 claims abstract description 13
- 239000004576 sand Substances 0.000 claims abstract description 11
- 239000004927 clay Substances 0.000 claims abstract description 10
- 238000012545 processing Methods 0.000 claims abstract description 8
- 239000011148 porous material Substances 0.000 claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 230000000712 assembly Effects 0.000 claims description 5
- 238000000429 assembly Methods 0.000 claims description 5
- 238000012546 transfer Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 description 5
- 238000007596 consolidation process Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 1
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- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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Abstract
The utility model relates to a pile foundation burden frictional resistance model test device based on lever loading, including the mold box, the soil body is equipped with in the mold box, and the soil body includes sand layer and clay layer, and sand layer is located clay layer top, be provided with two symmetry load boards on the soil body, the mold box periphery is provided with the support, be provided with lever loading subassembly on the support, lever loading subassembly is connected with the load board, be provided with the space between the load board, be provided with the simulation stake subassembly on the space, data acquisition subassembly has all been arranged in simulation stake subassembly and the soil body, data acquisition subassembly and data processing system are connected, carry out the analysis to data through data processing system, and the device can be accurate based on lever principle exert vertical load, can carry out single pile test and pile group test.
Description
Technical Field
The utility model relates to a pile foundation burden frictional resistance model test device based on lever loading.
Background
At present, the mode of pile foundation load friction model test loading device through jack application load in order to realize that soil around the stake is piled and is carried still has the defect, and the concrete expression is: when practical jack applys load to stake week soil, because the initial moisture content of stake week soil, compressibility is big, it is comparatively obvious to lead to subsiding of the soil body, and simultaneously, manual formula jack only applys in the load on stake week soil surface with displacement control, therefore, along with consolidation time's increase, stake week soil consolidation subsides and leads to the jack not enough to exert predetermined loading strength, for remedying this defect, the stroke through manual adjustment jack is usually in order to reach predetermined loading strength as far as possible many times regularly, the negative frictional resistance of single pile is tested usually to pile foundation negative frictional resistance model test device simultaneously, at present test the crowd's pile very seldom.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art exists, the utility model aims to provide a pile foundation load friction resistance model test device based on lever loading, the device can be accurate based on lever principle apply vertical load, can carry out single pile test and pile group simultaneously experimental.
Therefore, the utility model provides a pair of pile foundation burden frictional resistance model test device based on lever loading, including the mold box, the soil body is equipped with in the mold box, and the soil body includes sand layer and clay layer, and sand layer is located clay layer top, be provided with two symmetrical load boards on the soil body, the mold box periphery is provided with the support, be provided with lever loading subassembly on the support, lever loading subassembly and load board are connected, be provided with the space between the load board, be provided with the simulation stake subassembly on the space, the data acquisition subassembly has all been arranged in simulation stake subassembly and the soil body, the data acquisition subassembly is connected with data processing system, carries out the analysis through data processing system to data.
Furthermore, the lever type loading assembly comprises a fixed rod, a lever is hinged to the upper end of the fixed rod, one end of the lever is provided with a leveling weight, the other end of the lever is provided with a loading weight, a force transmission rod is arranged on the lever, a guide plate is arranged at the bottom end of the force transmission rod, connecting rods are symmetrically arranged on the guide plate and connected with a load plate, lever balance is achieved through the leveling weight, and different load stresses are perpendicularly acted on a soil body through the application of the loading weight.
Further, simulation stake subassembly includes the holding down plate, the holding down plate reciprocates along the length direction of connecting rod, be provided with the through-hole on the holding down plate and supply the connecting rod to insert, be connected with the vertical drive spare on the holding down plate, the oily polylith rectangular plate concatenation of holding down plate forms, the rectangular plate bottom face is provided with a plurality of joint interfaces, the joint interface is used for the joint pile body, and the vertical drive spare is used for the pile body of impressing and exerts vertical load to the pile body.
Furthermore, all be provided with the pressure bar on the rectangular plate, pressure bar bottom and rectangular plate up end fixed connection, dispose the weight on the pressure bar.
Further, the data acquisition subassembly includes multiunit stress sensor and a plurality of pore pressure meter, a plurality of stress sensor establish on the pile body, stress sensor along the length direction evenly distributed of pile body, stress sensor connects outside strain gauge, the pore pressure meter is installed in the soil body, and the pore pressure meter is connected with pore water pressure receiver, the mold box inner wall is embedded to have vertical warning lamp row, the pile body periphery is provided with the scale mark.
Further, the lever ratio of the lever is 1:24, i.e. the ratio of the loading force of the loading weight to the load transmitted by the dowel is 1:24.
furthermore, a drainage valve is arranged at the lower end part of the inner side wall of the model box.
The utility model has the advantages that:
1. through being provided with lever loading subassembly, through applying different loading weights, can reach the purpose of applying different loads, can comparatively accurately and carry out the uniform loading effectively.
2. The device can test the single pile, also can test the crowd's stake, can realize on the crowd's stake uneven load in soil body consolidation process crowd's stake body negative friction's change law, and the actual engineering is partly all crowd's stake, goes to guide actual engineering according to change law.
3. Simple structure, the experimental operation degree of difficulty is low.
Drawings
FIG. 1 is a schematic illustration of a test apparatus;
FIG. 2 is a front view of FIG. 1;
FIG. 3 is a top view of FIG. 1;
fig. 4 is a top view of the lower platen.
Reference numerals: 1. a model box; 2. a load plate; 3. a support; 4. a lever type loading assembly; 41. fixing the rod; 42. a lever; 43. leveling weights; 44. loading weights; 45. a dowel bar; 46. a guide plate; 47. a connecting rod; 5. simulating a pile assembly; 51. a lower pressing plate; 511. a rectangular plate; 512. a card interface; 513. applying a pressure rod; 514. a weighting block; 52. a vertical drive member; 53. a pile body; 6. a data acquisition component; 61. a stress sensor; 62. a pore pressure gauge; 63. a strain gauge; 64. a pore water pressure receiver; 65. a vertical warning light; 7. a drain valve; 8. and (4) soil body.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the objects of the present invention, the following detailed description of the embodiments, structures, features and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.
Referring to fig. 1 to 4, the pile foundation negative frictional resistance model test device based on lever loading according to the embodiment includes a model box 1, a soil body 8 is installed in the model box 1, the soil body 8 includes a sand layer and a clay layer, the sand layer is located above the clay layer, two symmetrical load plates 2 are arranged on the soil body 8, a support 3 is arranged on the periphery of the model box, a lever loading assembly 4 is arranged on the support 3, the lever loading assembly 4 is connected with the load plates 2, a gap is arranged between the load plates 2, a simulation pile assembly 5 is arranged on the gap, data acquisition assemblies 6 are arranged in the simulation pile assembly 5 and the soil body 8, the data acquisition assemblies 6 are connected with a data processing system, and data are analyzed through the data processing system.
On the basis of the above embodiment, the lever type loading assembly 4 includes a fixing rod 41, the upper end of the fixing rod 41 is hinged with a lever 42, one end of the lever 42 is provided with a leveling weight 43, the other end of the lever is provided with a loading weight 44, the lever 42 is provided with a force transmission rod 45, the bottom end of the force transmission rod 45 is provided with a guide plate 46, the guide plate 46 is symmetrically provided with connecting rods 47, the connecting rods 47 are connected with the load plate 2, the lever 42 is balanced through the leveling weight 43, and different load stresses are vertically acted on the soil body 8 through applying the loading weight 44.
On the basis of the above-mentioned embodiment, simulation pile subassembly 5 includes holding down plate 51, holding down plate 51 reciprocates along the length direction of connecting rod 47, it supplies connecting rod 47 to insert to be provided with the through-hole on holding down plate 51, be connected with vertical drive 52 on holding down plate 51, holding down plate 51 is formed by polylith rectangular plate 511 concatenation, rectangular plate 511 bottom end face is provided with a plurality of joint interfaces 512, joint interface 512 is used for the joint pile body 53, and vertical drive 52 is used for impressing pile body 53 and exerts vertical load to pile body 53.
On the basis of the above embodiment, the rectangular plates 511 are all provided with a pressing rod 513, the bottom end of the pressing rod 513 is fixedly connected with the upper end face of the rectangular plate 511, and a weight 514 is configured on the pressing rod 513.
On the basis of the above embodiment, the data acquisition assembly 6 includes a plurality of groups of stress sensors 61 and a plurality of pore pressure gauges 62, the plurality of stress sensors 61 are arranged on the pile body 53, the stress sensors 61 are uniformly distributed along the length of the pile body 53, the stress sensors 61 are connected with external strain gauges 63, the pore pressure gauges 62 are installed in the soil body 8, the pore pressure gauges 62 are connected with a pore water pressure receiver 64, vertical warning light 65 rows are embedded in the inner wall of the model box 1, and scale marks are arranged on the periphery of the pile body 53.
On the basis of the above embodiment, the lever 42 ratio of the lever 42 is 1:24, namely the ratio of the loading force of the loading weight 44 to the load transferred by the force transfer rod 45 is 1:24.
in addition to the above embodiments, the lower end of the inner side wall of the mold box 1 is provided with a drain valve 7.
The improvement is as follows: as shown in fig. 1 to 4: the testing device comprises a model box 1, wherein the model box 1 is a transparent model box with an opening, and a drainage valve 7 is arranged at the bottom of the model box 1 and used for draining pore water in a soil body 8; the soil body 8 is equipped with in the mold box 1, the soil body 8 includes sand layer and clay layer, the sand layer is located clay layer top, the sand layer top is provided with symmetrical load board 2, mold box periphery is provided with support 3, be provided with lever loading subassembly 4 on the support 3, lever loading subassembly 4 is connected with load board 2, lever loading subassembly 4 includes dead lever 41, dead lever 41 one end is fixed on support 3, the other end articulates there is lever 42, be provided with dowel steel 45 on the lever 42, dowel steel 45 bottom is provided with baffle 46, the symmetry is provided with connecting rod 47 on the baffle 46, connecting rod 47 connects load board 2, realize lever 42 balance at leveling weight 43, through applying loading weight 44, realize that different loads transmit to the soil body 8, lever 42 of lever 42 than being 1:24, i.e. the ratio of the loading force of the loading weight 44 to the load transmitted by the force transmission rod 45 is 1:24, loading the load plate 2 by using the principle of the lever 42, and accurately and effectively applying load by reasonably using the lever 42 ratio; the simulation pile assembly comprises a lower pressing plate 51, a vertical driving part 52 is connected to the lower pressing plate 51, the vertical driving part 52 is vertical hydraulic pressure, a through hole is formed in the lower pressing plate 51, a hydraulic rod drives the through hole of the lower pressing plate 51 to move downwards along the length direction of a connecting rod 47 to press foundation piles into the soil body 8, the lower pressing plate 51 is formed by splicing a plurality of rectangular plates 511, a plurality of clamping ports 512 are formed in the bottom end face of each rectangular plate 511 and used for clamping a pile body 53, the quantity of the foundation piles is installed according to a single pile test or a grouped pile test, and according to a test purpose, for example, when the test piles and grouped soil around the group piles bear the same load, the negative friction of the pile bodies of the grouped piles is changed, the driving part 52 not only has the function of pressing the simulation pile assemblies 5 into the foundation piles, but also has the function of uniformly applying the load to the group piles; for example, when positions in a test pile group are subjected to uneven load, the negative frictional resistance of the pile body of the pile group changes, and in addition to applying the even load by vertical driving, a weighting block 514 is arranged on a pressing rod 513 on a rectangular plate 511 of a corresponding foundation pile to form uneven load, and on the premise of receiving the uneven load, the load applying process of a soil body 8 influences the negative frictional resistance of the pile body of the pile group; the data acquisition assembly 6 comprises a plurality of groups of stress sensors 61 and a plurality of pore pressure gauges 62, the stress sensors 61 are arranged on the pile body 53, the stress sensors 61 are uniformly distributed along the length of the pile body 53, the stress sensors 61 are connected with an external strain gauge 63, the pore pressure gauges 62 are installed in the soil body 8, the pore pressure gauges 62 are connected with a pore water pressure receiver 64, scale marks are arranged on the periphery of the pile body 53, vertical warning lamps 65 are embedded in the inner wall of the model box 1, the stress sensors 61 are used for monitoring the stress strain of the pile body, the vertical warning lamps 65 and the scale marks are used for observing the settlement condition of the soil body 8 or the pile body 53, the pore pressure is added for monitoring the layered pore water pressure of the soil body 8 around the pile body 53, the pore water pressure dissipation condition of the soil body 8 is monitored, a large amount of actually measured data are obtained through different monitoring tools, the central point position of the pile body 53 is comprehensively judged according to the data, the negative frictional resistance, the pull-down load and the bearing capacity of the pile body 53.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above description, and although the present invention has been disclosed by the preferred embodiment, it is not limited to the present invention, and any person skilled in the art can make modifications or changes equivalent to the equivalent embodiments by utilizing the above disclosed technical contents without departing from the technical scope of the present invention, but all the modifications, changes and changes of the technical spirit of the present invention made to the above embodiments are also within the scope of the technical solution of the present invention.
Claims (7)
1. The utility model provides a pile foundation burden frictional resistance model test device based on lever loading, includes mold box (1), be equipped with soil body (8) in mold box (1), soil body (8) include sand layer and clay layer, and sand layer is located the clay layer top, its characterized in that: the device is characterized in that two symmetrical load plates (2) are arranged on the soil body (8), a support (3) is arranged on the periphery of the model box (1), a lever type loading assembly (4) is arranged on the support (3), the lever type loading assembly (4) is connected with the load plates (2), a gap is formed between the load plates (2), a simulation pile assembly (5) is arranged on the gap, data acquisition assemblies (6) are arranged in the simulation pile assembly (5) and the soil body (8), the data acquisition assemblies (6) are connected with a data processing system, and data are analyzed through the data processing system.
2. The pile foundation negative frictional resistance model test device based on lever loading according to claim 1, characterized in that: the lever type loading assembly (4) comprises a fixing rod (41), a lever (42) is hinged to the upper end of the fixing rod (41), one end of the lever (42) is provided with a leveling weight (43), the other end of the lever is provided with a loading weight (44), a force transfer rod (45) is arranged on the lever (42), a guide plate (46) is arranged at the bottom end of the force transfer rod (45), connecting rods (47) are symmetrically arranged on the guide plate (46), the connecting rods (47) are connected with the load plate (2), the lever (42) is balanced through the leveling weight (43), and different load stresses are vertically acted on a soil body (8) through applying the loading weight (44).
3. The pile foundation negative friction resistance model test device based on lever loading according to claim 1 or 2, characterized in that simulation stake subassembly (5) includes holding down plate (51), holding down plate (51) reciprocates along the length direction of connecting rod (47), be provided with the through-hole on holding down plate (51) and supply connecting rod (47) to insert, be connected with vertical drive spare (52) on holding down plate (51), holding down plate (51) is formed by polylith rectangular plate (511) concatenation, rectangular plate (511) bottom face is provided with a plurality of joint interfaces (512), joint interface (512) are used for joint pile body (53), and vertical drive spare (52) are used for impressing pile body (53) and apply vertical load to pile body (53).
4. The pile foundation negative frictional resistance model test device based on lever loading according to claim 3, characterized in that: all be provided with pressure bar (513) on rectangular plate (511), pressure bar (513) bottom and rectangular plate (511) up end fixed connection, dispose weighting piece (514) on pressure bar (513).
5. The pile foundation negative friction resistance model test device based on lever loading according to claim 4, characterized in that: data acquisition subassembly (6) include multiunit stress sensor (61) and a plurality of pore pressure meter (62), establish on pile body (53) a plurality of stress sensor (61), stress sensor (61) are along the length evenly distributed of pile body (53), and outside strain gauge (63) is connected in stress sensor (61), install in soil body (8) pore pressure meter (62), and pore pressure meter (62) are connected with pore water pressure receiver (64), model case (1) inner wall is embedded to have vertical warning light (65) to arrange, pile body (53) periphery is provided with the scale mark.
6. The pile foundation negative frictional resistance model test device based on lever loading according to claim 5, characterized in that: the lever (42) ratio of the lever (42) is 1:24, namely the ratio of the loading force of the loading weight (44) to the load transferred by the force transfer rod (45) is 1:24.
7. the pile foundation negative frictional resistance model test device based on lever loading according to claim 6, characterized in that: and a drainage valve (7) is arranged at the lower end part of the inner side wall of the model box (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221709969.2U CN218813913U (en) | 2022-07-04 | 2022-07-04 | Pile foundation negative frictional resistance model test device based on lever loading |
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| CN202221709969.2U CN218813913U (en) | 2022-07-04 | 2022-07-04 | Pile foundation negative frictional resistance model test device based on lever loading |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115354702A (en) * | 2022-07-04 | 2022-11-18 | 温州大学 | Pile foundation negative frictional resistance model test device based on lever loading and pile group test method |
-
2022
- 2022-07-04 CN CN202221709969.2U patent/CN218813913U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115354702A (en) * | 2022-07-04 | 2022-11-18 | 温州大学 | Pile foundation negative frictional resistance model test device based on lever loading and pile group test method |
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