CN215669722U - Model box for simulating pile foundation frictional resistance distribution and neutral point position - Google Patents
Model box for simulating pile foundation frictional resistance distribution and neutral point position Download PDFInfo
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- CN215669722U CN215669722U CN202121121629.3U CN202121121629U CN215669722U CN 215669722 U CN215669722 U CN 215669722U CN 202121121629 U CN202121121629 U CN 202121121629U CN 215669722 U CN215669722 U CN 215669722U
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- frictional resistance
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- 230000007935 neutral effect Effects 0.000 title claims abstract description 26
- 238000009826 distribution Methods 0.000 title claims abstract description 12
- 239000002689 soil Substances 0.000 claims abstract description 46
- 230000007246 mechanism Effects 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 5
- 238000004088 simulation Methods 0.000 claims abstract description 4
- 239000012780 transparent material Substances 0.000 claims abstract description 4
- 238000003825 pressing Methods 0.000 claims description 27
- 239000011521 glass Substances 0.000 claims description 13
- 230000005484 gravity Effects 0.000 claims description 8
- 230000009471 action Effects 0.000 claims description 4
- 238000012360 testing method Methods 0.000 abstract description 8
- 230000008859 change Effects 0.000 abstract description 7
- 238000006073 displacement reaction Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 239000002023 wood Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Abstract
The utility model discloses a model box for simulating the frictional resistance distribution and the neutral point position of a pile foundation, wherein at least one of the front side wall and the rear side wall of the rectangular model box is detachably arranged, the front side wall is made of a transparent material, and the front side wall is provided with scales along the vertical direction; the top end of the rectangular model box is opened, the bottom end of the rectangular model box is closed, a pile foundation socket is arranged in the center of the closed surface, and the bottom end of the pile foundation is abutted against the pile end soil simulation mechanism after passing through the pile foundation socket; the left side and the right side of the part of the pile foundation in the box body are both provided with side wings arranged at intervals; the side wing is made of semi-flexible material and deforms along with the deformation of the soil body; the model box is provided with a loading mechanism which enables the pile foundation to generate positive frictional resistance or negative frictional resistance. The model box is used for forming a mechanical test device for simulating the resistance of the pile end and the change of the neutral point, so that the mechanical test device is simple and high in precision, and not only can simulate the resistance of the pile end of positive and negative frictional resistance and the deformation of soil around the pile, but also can simulate the change of the neutral point position during negative frictional resistance.
Description
Technical Field
The utility model relates to the technical field of civil engineering, in particular to a model box for simulating the distribution of the frictional resistance of a pile foundation and the position of a neutral point.
Background
The main effect of pile foundation is with upper portion load transmission to lower part soil layer, and its vertical bearing capacity is that pile soil combined action provides, and pile body can carry out the interact with pile week and pile end soil in the transmission course and form frictional resistance and end resistance. When the soil sinking displacement around the pile is smaller than that of the pile body, the positive frictional resistance in the upward direction is generated around the pile to prevent the pile foundation from sinking; when the soil subsidence displacement around the pile is larger than the pile body, negative friction resistance in the downward direction is generated around the pile, the pile foundation subsidence is increased, and the building is unevenly subsided. The method is influenced by factors such as load size, pile body rigidity, pile soil surrounding and pile end soil property, the interaction and load transfer mechanism of the pile soil are complex, and the current related research theory is still incomplete.
When the soil property around the pile is not changed, the influence of the pile end soil rigidity on the proportion of the frictional resistance and the end resistance to the total bearing capacity is great: when the rigidity of the pile end soil is small, the frictional resistance is fully exerted, and the end resistance ratio is small; on the contrary, the frictional resistance cannot be fully exerted, and the end resistance ratio is large. When the negative frictional resistance is generated, the frictional resistance at the position where the settlement of the soil around the pile is equal to that of the cross section of the pile and no relative displacement occurs is zero, namely the neutral point of the pile. The frictional resistance above this position is a negative frictional resistance and the frictional resistance below this position is a positive frictional resistance, at which point the shaft force of the pile body reaches a maximum. The neutral point is an important parameter in the stress analysis and the bearing capacity design of the pile foundation, and the change of the position of the neutral point directly influences the magnitude of the negative frictional resistance of the pile foundation.
The depth ratio ln/l0 of the neutral point specified in the current specification is obtained from engineering experience, and is estimated according to the characteristics of the pile end soil bearing stratum, so that the situation of overlarge error often exists in the actual design. The conventional experimental research method is to calculate the relative displacement of the pile soil by measuring the soil pressure around the pile and the stress distribution of the pile body, and calculate the displacement zero point as the depth of the neutral point. The neutral point position can not be directly measured, the interaction of the pile and the soil can not be directly observed, and the mechanism error is difficult to control.
Chinese patent publication No. CN108181180A discloses a test apparatus and method for simulating the change of the neutral point of negative frictional resistance of a pile caused by ground stacking. The testing device obtains settlement of different depths of soil around the pile and pile-soil relative displacement through the colored gravel and the pile side marks so as to determine the position change of a neutral point. But has the following disadvantages: the used material only can be transparent soil, and the colored gravel used as the marking is easy to mix with the transparent soil; drainage is needed, and drainage conditions are not consistent with actual conditions; the settlement and the deformation are determined by adopting the image processing of the camera, and the data is difficult to keep accurate; the loading mechanism is relatively complex to manufacture and relatively high in cost.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of providing a model box for simulating the distribution of the frictional resistance and the position of a neutral point of a pile foundation, which is used for forming a mechanical test device for simulating the variation of the pile end resistance and the neutral point, so that the mechanical test device is simple and high in precision, and not only can simulate the pile end resistance of positive and negative frictional resistance and the deformation of soil around the pile, but also can simulate the variation of the position of the neutral point during negative frictional resistance.
In order to solve the technical problems, the utility model adopts the following technical means:
a model box for simulating the frictional resistance distribution and the neutral point position of a pile foundation comprises a rectangular model box and the pile foundation arranged in the rectangular model box, wherein at least one of the front side wall or the rear side wall of the rectangular model box is detachably arranged, the front side wall is made of a transparent material, and the front side wall is provided with scales along the vertical direction; the top end of the rectangular model box is opened, the bottom end of the rectangular model box is closed, a pile foundation socket is arranged in the center of the closed surface, and the bottom end of the pile foundation is abutted against the pile end soil simulation mechanism after passing through the pile foundation socket; the left side and the right side of the part of the pile foundation in the box body are both provided with side wings arranged at intervals; the side wing is made of semi-flexible material and deforms along with the deformation of the soil body; the model box is provided with a loading mechanism which enables the pile foundation to generate positive frictional resistance or negative frictional resistance.
At least one side wall of the front side wall or the rear side wall of the rectangular model box is detachably arranged, so that the next side wall is conveniently placed on the side and detached, and soil is uniformly filled into the box through the detached side wall; the soil around the pile foundation and the side wings is uniformly filled; when the loading mechanism acts on the pile foundation, the pile foundation generates positive frictional resistance; the loading mechanism acts on experimental soil filled beside the pile foundation to enable the pile foundation to generate negative frictional resistance. The device can simplify the mechanical test device, has high precision, can simulate the pile end resistance and the pile soil deformation of positive and negative frictional resistance, and can also simulate the change of the neutral point position in the process of negative frictional resistance.
The further preferred technical scheme is as follows:
the left side wall and the right side wall of the rectangular model box are left and right wooden side walls, the front side wall and the rear side wall are front and rear glass side walls, and the front side and the rear side of the left and right wooden side walls are both provided with vertically arranged caulking grooves.
By the arrangement, the front and rear glass side walls can be conveniently nested and arranged in the caulking grooves of the left and right wooden side walls or pulled out from the caulking grooves of the left and right wooden side walls.
The caulking groove edge department be equipped with fixing bolt, play the fixed action at fixing bolt to front and back glass lateral wall, prevent outwards to drop, the glass lateral wall is taken out or is inserted from the caulking groove simultaneously around allowing.
Through setting up fixing bolt, fixing bolt plays fixed anticreep effect.
The loading mechanism comprises a pile foundation pressurizing device, a pile loading pressurizing device and weights; the weights are directly placed on the pile foundation pressurizing device or the pile loading pressurizing device.
When the pile foundation pressurizing device is adopted, the pile foundation pressurizing device is arranged at the top of the pile foundation so that the pile foundation generates positive frictional resistance; experimental soil filled beside the pile foundation is arranged to enable the pile foundation to generate negative frictional resistance when the pile loading pressurizing device is adopted.
The pile foundation pressurizing device and the pile loading pressurizing device are both provided with a pressing block and a pressing block support, and the pressing block support of the pile foundation pressurizing device is clamped at the top end of the pile foundation so that the gravity of the pile foundation pressurizing device acts on the top end of the pile foundation; the bottom of the pressing block support of the pile loading pressurizing device is provided with a pressing plate, the top end of the pile foundation upwards penetrates through the pressing plate and has no friction with the pressing plate, and the gravity of the pile loading pressurizing device only acts on the upper surface of the experimental soil through the pressing plate.
Through setting up the briquetting support, be convenient for make pile foundation pressure device or pile through the briquetting support carry pressure device's gravity to act on the upper surface of the experimental soil of packing in pile foundation or the rectangular mold case.
Drawings
Fig. 1 is a perspective view of a mold box of the present invention.
Fig. 2 is a view showing a state of use of the mold box and pile foundation pressing device shown in fig. 1.
FIG. 3 is a view showing a state of use of the mold box and the stacking and pressurizing device in FIG. 1.
Fig. 4 is a perspective view of the pile foundation of the present invention.
Description of reference numerals: 1-pile foundation, 2-glass side wall, 3-flank, 4-soil, 5-wooden side wall, 6-support upper plate, 7-scale, 8-pile foundation pressurizing device, 9-pile loading pressurizing device and 10-weight.
Detailed Description
The present invention will be further described with reference to the following examples.
Referring to fig. 1-4, the model box for simulating the frictional resistance distribution and the neutral point position of the pile foundation 1 according to the present invention is composed of a rectangular model box and a pile foundation 1; at least one of the front side wall or the rear side wall of the rectangular model box is detachably arranged, the front side wall is made of transparent material, and the front side wall is provided with scales 7 along the vertical direction; the top end of the rectangular model box is opened, the bottom end of the rectangular model box is closed through the upper support plate 6, a pile foundation socket is arranged in the center of the closed surface, and the bottom end of the pile foundation 1 abuts against the pile end soil 4 simulation mechanism after passing through the pile foundation socket; the left side and the right side of the part of the pile foundation 1 in the box body are both provided with side wings 3 arranged at intervals; the side wing 3 is made of semi-flexible material, and the side wing 3 deforms along with the deformation of the soil 4 body; the model box is provided with a loading mechanism which enables the pile foundation 1 to generate positive frictional resistance or negative frictional resistance.
At least one side wall of the front side wall or the rear side wall of the rectangular model box is detachably arranged, so that the next side wall is conveniently placed on the side and detached, and soil 4 is uniformly filled into the rectangular model box through the detached side wall; the soil 4 around the pile foundation 1 and the side wing 3 is filled uniformly; when the loading mechanism acts on the pile foundation 1, the pile foundation 1 generates positive frictional resistance; the loading mechanism acts on experimental soil 4 filled beside the pile foundation 1 to enable the pile foundation 1 to generate negative frictional resistance. The device can simplify the mechanical test device, has high precision, can simulate the pile end resistance of the positive and negative frictional resistance and the deformation of the soil 4 around the pile, and can also simulate the change of the neutral point position in the negative frictional resistance.
The left side wall and the right side wall of the rectangular model box are left wood side walls 5 and right wood side walls 5, the front side wall and the rear side wall are front glass side walls and rear glass side walls 2, and the front side and the rear side of the left wood side wall and the rear side of the right wood side wall 5 are both provided with vertically arranged caulking grooves.
With the arrangement, the front and rear glass side walls 2 can be conveniently nested in the caulking grooves of the left and right wooden side walls or drawn out from the caulking grooves of the left and right wooden side walls 5.
The caulking groove edge department be equipped with fixing bolt, play the fixed action at fixing bolt to front and back glass lateral wall, prevent outwards to drop, the glass lateral wall is taken out or is inserted from the caulking groove simultaneously around allowing.
Through setting up fixing bolt, fixing bolt plays fixed anticreep effect.
The loading mechanism comprises a pile foundation pressurizing device 8, a pile loading pressurizing device 9 and weights 10; the weight 10 is placed directly on the pile pressing device 8 or the pile loading pressing device 9.
When the pile foundation pressurizing device 8 is adopted, the pile foundation pressurizing device is arranged at the top of the pile foundation 1 to enable the pile foundation 1 to generate positive frictional resistance; the experimental soil 4 filled beside the pile foundation 1 when the pile loading pressurizing device 9 is adopted enables the pile foundation 1 to generate negative frictional resistance.
The pile foundation pressurizing device 8 and the pile loading pressurizing device 9 are both provided with a pressing block and a pressing block support, and the pressing block support of the pile foundation pressurizing device 8 is clamped and sleeved at the top end of the pile foundation 1 so that the gravity of the pile foundation pressurizing device 8 acts on the top end of the pile foundation 1; the pressing plate is arranged at the bottom end of the pressing block support of the pile loading pressurizing device 9, the top end of the pile foundation 1 upwards penetrates through the pressing plate and has no friction with the pressing plate, and the gravity of the pile loading pressurizing device 9 only acts on the upper surface of the experimental soil 4 through the pressing plate.
Through setting up the briquetting support, be convenient for make pile foundation pressure device 8 or pile load pressure device 9's gravity act on the upper surface of the experimental soil 4 of pile foundation 1 or rectangular mold incasement intussuseption through the briquetting support.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, which is defined in the appended claims.
Claims (5)
1. The utility model provides a mold box for simulating pile foundation frictional resistance distributes and neutral point position, includes rectangular model box, sets up the pile foundation in rectangular model box, its characterized in that: at least one of the front side wall or the rear side wall of the rectangular model box is detachably arranged, the front side wall is made of transparent material, and the front side wall is provided with scales along the vertical direction; the top end of the rectangular model box is opened, the bottom end of the rectangular model box is closed, a pile foundation socket is arranged in the center of the closed surface, and the bottom end of the pile foundation is abutted against the pile end soil simulation mechanism after passing through the pile foundation socket; the left side and the right side of the part of the pile foundation in the box body are both provided with side wings arranged at intervals; the side wing is made of semi-flexible material and deforms along with the deformation of the soil body; the model box is provided with a loading mechanism which enables the pile foundation to generate positive frictional resistance or negative frictional resistance.
2. The model box for simulating the pile foundation frictional resistance distribution and the neutral point position according to claim 1, characterized in that: the left side wall and the right side wall of the rectangular model box are left and right wooden side walls, the front side wall and the rear side wall are front and rear glass side walls, and the front side and the rear side of the left and right wooden side walls are both provided with vertically arranged caulking grooves.
3. The model box for simulating the pile foundation frictional resistance distribution and the neutral point position according to claim 2, wherein: the caulking groove edge department be equipped with fixing bolt, play the fixed action at fixing bolt to front and back glass lateral wall, prevent outwards to drop, the glass lateral wall is taken out or is inserted from the caulking groove simultaneously around allowing.
4. The model box for simulating the pile foundation frictional resistance distribution and the neutral point position according to claim 1, characterized in that: the loading mechanism comprises a pile foundation pressurizing device, a pile loading pressurizing device and weights; the weights are directly placed on the pile foundation pressurizing device or the pile loading pressurizing device.
5. The model box for simulating the pile foundation frictional resistance distribution and the neutral point position according to claim 4, wherein: the pile foundation pressurizing device and the pile loading pressurizing device are both provided with a pressing block and a pressing block support, and the pressing block support of the pile foundation pressurizing device is clamped at the top end of the pile foundation so that the gravity of the pile foundation pressurizing device acts on the top end of the pile foundation; the bottom of the pressing block support of the pile loading pressurizing device is provided with a pressing plate, the top end of the pile foundation upwards penetrates through the pressing plate and has no friction with the pressing plate, and the gravity of the pile loading pressurizing device only acts on the upper surface of the experimental soil through the pressing plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121121629.3U CN215669722U (en) | 2021-05-25 | 2021-05-25 | Model box for simulating pile foundation frictional resistance distribution and neutral point position |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121121629.3U CN215669722U (en) | 2021-05-25 | 2021-05-25 | Model box for simulating pile foundation frictional resistance distribution and neutral point position |
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| Publication Number | Publication Date |
|---|---|
| CN215669722U true CN215669722U (en) | 2022-01-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121121629.3U Expired - Fee Related CN215669722U (en) | 2021-05-25 | 2021-05-25 | Model box for simulating pile foundation frictional resistance distribution and neutral point position |
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| Country | Link |
|---|---|
| CN (1) | CN215669722U (en) |
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2021
- 2021-05-25 CN CN202121121629.3U patent/CN215669722U/en not_active Expired - Fee Related
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Granted publication date: 20220128 |
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| CF01 | Termination of patent right due to non-payment of annual fee |