CN212129265U - Pile end resistance testing device at variable cross section of composite pile of riser pipe - Google Patents
Pile end resistance testing device at variable cross section of composite pile of riser pipe Download PDFInfo
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- CN212129265U CN212129265U CN202020639710.XU CN202020639710U CN212129265U CN 212129265 U CN212129265 U CN 212129265U CN 202020639710 U CN202020639710 U CN 202020639710U CN 212129265 U CN212129265 U CN 212129265U
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Abstract
The utility model provides a riser composite pile variable cross section department stake end resistance testing arrangement, includes: the lower-section pile is arranged below the upper-section pile, wherein the lower end of the upper-section pile and the upper end of the lower-section pile are coaxially connected together at the section, and the connected upper-section pile and lower-section pile form a variable-section pile; a mould groove is arranged around the section pile, and a soil layer is prepared in the mould groove; the upper surface of the upper section of pile is provided with a loading plate; the variable-section piles are driven into the soil layer in the vertical downward direction by applying a load to the loading plate. The utility model considers the variable cross-section pile in upper and lower sections, and not only tests the lower end of the upper section pile and the upper end strain of the upper section pile; moreover, the pile end resistance at the variable cross section under the action of each level of load is calculated; meanwhile, on the basis of not changing the shape of the variable cross section pile end, the resistance of the variable cross section pile end can be conveniently and simply measured, the detection cost is greatly reduced, the detection efficiency is improved, and the method has a good use value.
Description
Technical Field
The utility model belongs to geotechnical engineering pile foundation bearing capacity test field especially relates to compound stake variable cross section department of water proof pipe pile end resistance testing arrangement.
Background
At present, with the rapid development of national economy, the construction engineering is also rapidly developed; and put forward higher demands to its security, stability, especially put forward higher demands to the application aspect of pile foundation. The optimization and selection of the pile foundation are very important aspects, and the variable-section type pile of the pile foundation has good economic value and technical advantages, so that the variable-section type pile is concerned by scholars at home and abroad; therefore, new structural forms such as club-footed piles, support disc piles, multi-stage expanding piles, stepped variable-section piles and the like are provided. However, the research on the deformation and the bearing characteristics of the pile foundation, particularly the variable cross section and the calculation theory is not systematic and incomplete, and the popularization and the application of the pile foundation are difficult. Therefore, the reasonable evaluation of the resistance and the change rule of the pile end at the variable section of the variable-section pile becomes the most key problem at present.
The existing common method for testing the resistance of the pile end is to embed a soil pressure box at the pile end, but the method changes the shape of the pile end, and the embedded soil pressure box at the pile end only measures the pressure of a certain area of the pile end part, so that the resistance of the pile end is not easy to measure in the process of driving a pile body; moreover, the pressure box is easy to fall off; thus, the pile tip resistance has a problem that it is difficult to directly and accurately measure the pile tip resistance.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a compound stake variable cross section department of riser pipe stake end resistance testing arrangement to it is difficult to direct accurate measurement and difficult measuring technical problem to solve stake end resistance.
In order to achieve the above object, the utility model discloses a riser composite pile variable cross section department stake end resistance testing arrangement's concrete technical scheme as follows:
the utility model provides a riser composite pile variable cross section department stake end resistance testing arrangement, includes: the lower-section pile is arranged below the upper-section pile, wherein the lower end of the upper-section pile and the upper end of the lower-section pile are coaxially connected together at the section, and the connected upper-section pile and lower-section pile form a variable-section pile; a mould groove is arranged around the section pile, and a soil layer is prepared in the mould groove; the upper surface of the upper section of pile is provided with a loading plate; the variable-section piles are driven into the soil layer in the vertical downward direction by applying a load to the loading plate.
Further, the diameter of the upper section pile is larger than that of the lower section pile; a plurality of first strain gauges are arranged at the lower end of the upper section of pile, and a plurality of second strain gauges are arranged at the upper end of the lower section of pile; and a plurality of first strain gauges arranged at the lower end of the upper section pile and a plurality of second strain gauges arranged at the upper end of the lower section pile are respectively connected with the data acquisition instrument through a first data line and a second data line.
Further, the plurality of first strain gauges are arranged on two opposite sides of the lower end of the upper section pile; the second strain gauges are arranged on two opposite sides of the upper end of the lower section pile; and the surfaces of the first strain gauge and the second strain gauge are coated with epoxy resin glue layers, and the thickness of the epoxy resin glue layers is 1-2 mm.
Further, the die groove is a square groove body.
Further, the soil layer is composed of a homogeneous clay that does not drain water.
Further, the loading plate is a circular plate and is made of a wood plate, an iron plate or a composite plate.
Furthermore, the pile body of the variable cross-section pile is made of organic glass material.
The utility model discloses an have following advantage:
the utility model has the advantages that the design principle is clear, the use method is simple, the variable cross-section pile is divided into an upper section and a lower section, and the strain of the lower end of the upper section pile and the strain of the upper end of the upper section pile are tested through the two strain gauges arranged at the lower end of the upper section pile and the upper end of the lower section pile; moreover, the pile end resistance at the variable cross section under the action of each level of load is calculated; meanwhile, on the basis of not changing the shape of the variable cross section pile end, the resistance of the variable cross section pile end can be conveniently and simply measured, the detection cost is greatly reduced, the detection efficiency is improved, and the method has a good use value.
Drawings
FIG. 1 is a schematic front view of the model pile structure of the present invention;
fig. 2 is a schematic top view of the model pile structure of the present invention;
fig. 3 is the model pile structure static load test schematic diagram of the utility model.
The notation in the figure is:
1. upper pile sections; 2. piling at the lower section; 3. the variable cross section is arranged; 4. a first strain gauge; 5. a second strain gauge; 6. a mould groove; 7. a soil layer; 8. a first data line; 9. a second data line; 10. and a loading plate.
Detailed Description
In order to better understand the purpose, structure and function of the present invention, the following drawings are combined to describe the pile tip resistance testing device of the variable cross-section of the composite pile of the water-resisting conduit in further detail.
As shown in fig. 1-3, the present invention includes: the pile comprises an upper section pile 1 and a lower section pile 2 arranged below the upper section pile 1, wherein the lower end of the upper section pile 1 and the upper end of the lower section pile 2 are coaxially connected together at a section 3 in a bolt connection mode or a close fit mode, and the connected upper section pile 1 and the lower section pile 2 form a variable section pile; a model groove 6 is arranged around the section pile, and a soil layer 7 formed by non-drainage homogeneous clay is prepared in the model groove 6; the upper surface of the upper pile section 1 is provided with a loading plate 10; the variable cross section piles are driven into the soil 7 in a vertically downward direction by applying a load to the loading plate 10.
The diameter of the upper section pile 1 is larger than that of the lower section pile 2.
A plurality of first strain gauges 4 (two in this embodiment) are arranged at the lower end of the upper pile section 1, and a plurality of second strain gauges 5 (two in this embodiment) are arranged at the upper end of the lower pile section 2; a plurality of first strain gauges 4 arranged at the lower end of the upper section pile 1 and a plurality of second strain gauges 5 arranged at the upper end of the lower section pile 2 are respectively connected with a data acquisition instrument through a first data line 8 and a second data line 9;
the first strain gauges 4 are disposed on opposite sides of the lower end of the upper pile 1.
The second strain gauges 5 are disposed on opposite sides of an upper end of the lower pile 2.
The surfaces of the first strain gauge 4 and the second strain gauge 5 are coated with epoxy resin glue layers, and the thickness of the epoxy resin glue layers is 1-2mm, so that the first strain gauge 4 and the second strain gauge 5 are protected from being damaged by the soil layer 7 in the process of being inserted into the soil layer 7.
The mold groove 6 is a square groove body.
The loading plate 10 is a circular plate, and the loading plate 10 is made of a wood plate, an iron plate, or a composite plate.
The pile body of the variable cross-section pile is made of organic glass material to analyze D1＝0.03，D2＝0.016m，d1＝0.012m，d2For example, when the test is performed at 46000000000Pa with an E of 0.006m, the first strain gauge 4 and the second strain gauge 5 used for the test are of the BFH120-3AA-D150 type.
When the device for testing the resistance of the pile end at the variable cross section of the riser composite pile is utilized, the method comprises the following steps:
the first step is as follows: preparing sand or clay in a model groove 6 with the length, width and height of 2 meters respectively, applying a load Qi to a loading plate 10, and vertically driving a model pile of a variable cross-section pile into a soil layer 7 in the model groove 6 in an upward direction;
the second step is that: testing the pile body strain generated by the load of the pile top and the pile end resistance at the variable cross section of the variable cross section pile through a first strain gauge 4 positioned at the lower end of the upper section pile 1 and a second strain gauge 5 positioned at the upper end of the lower section pile 2; wherein the content of the first and second substances,
the pile wall of the upper section pile 1 generates strain ofOn the upper part，i，On the upper partI, the pile wall of the lower section pile 2 generates strainLower part，i，Lower part，i；
The third step: applying a load Q & lt 520N to the variable-section pile top, and calculating the pile end resistance at the variable section of the variable-section pile according to the following formulas (1), (2) and (3):
Fbecome＝FOn the upper part-FLower part＝391.515-196.295＝195.22N (3)
Wherein under the load QiUnder the condition, the axial force of the variable cross-section pile body can be calculated according to the strain, the axial force of the pile body of the upper section pile 1 is calculated according to the formula (1), the axial force of the pile body of the lower section pile 2 is calculated according to the formula (2), and the resistance of the pile end at the variable cross-section position is calculated according to the formula (3):
Fchange, i＝FUpper, i-FIn the following, the first and second parts of the material,i (3)
in the formula:
Fupper, iTo be under the load QiUnder the action of the pile head with the variable cross section, the axial force of the pile body with the variable cross section at the cross section of the first strain gage 4 at the lower end of the upper-section pile 1 is expressed by N;
Fbelow, iTo be under the load QiUnder the action of the pile head with the variable cross section, the axial force of the pile body at the cross section where the second strain gauge 5 at the upper end of the lower pile 2 is located is N;
Fchange, iTo be under the load QiActing on the resistance of the pile end at the variable cross section under the pile head of the variable cross section, wherein the unit is N;
e is the elastic modulus of the pile material and has the unit of Pa;
D1the outer diameter of the upper section pile is m;
D2the outer diameter of the lower section pile is m;
d1is the inner diameter of the upper pile section, d1More than or equal to 0, and the unit is m;
d2the inner diameter of the lower pile section, d2More than or equal to 0, and the unit is m;
upper, iFor upper pile under load QiUnder the action, the strain value of the section where the strain gauge of the upper section pile is located;
below, iIs a lower section of pile under load QiAnd under the action, the strain value of the section where the lower section pile strain gauge is located.
The variable cross-section piles, the strain gauges, the soil layers and the data lines are prior art, and the unexplained technology is prior art, so that the details are not repeated.
It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes or equivalents may be substituted for elements thereof by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application are intended to be covered by the present invention.
Claims (7)
1. The utility model provides a riser composite pile variable cross section department stake end resistance testing arrangement which characterized in that includes: the lower-section pile is arranged below the upper-section pile, wherein the lower end of the upper-section pile and the upper end of the lower-section pile are coaxially connected together at the section, and the connected upper-section pile and lower-section pile form a variable-section pile; a mould groove is arranged around the section pile, and a soil layer is prepared in the mould groove; the upper surface of the upper section of pile is provided with a loading plate; the variable-section piles are driven into the soil layer in the vertical downward direction by applying a load to the loading plate.
2. The device for testing the resistance of the pile end at the variable cross section of the riser composite pile according to claim 1, wherein the diameter of the upper pile section is larger than that of the lower pile section; a plurality of first strain gauges are arranged at the lower end of the upper section of pile, and a plurality of second strain gauges are arranged at the upper end of the lower section of pile; and a plurality of first strain gauges arranged at the lower end of the upper section pile and a plurality of second strain gauges arranged at the upper end of the lower section pile are respectively connected with the data acquisition instrument through a first data line and a second data line.
3. The device for testing the pile end resistance at the variable cross section of the riser composite pile according to claim 2, wherein the plurality of first strain gauges are arranged on two opposite sides of the lower end of the upper section of pile; the second strain gauges are arranged on two opposite sides of the upper end of the lower section pile; and the surfaces of the first strain gauge and the second strain gauge are coated with epoxy resin glue layers, and the thickness of the epoxy resin glue layers is 1-2 mm.
4. The device for testing the pile end resistance at the variable cross section of the riser composite pile according to claim 1, wherein the mold groove is a square groove body.
5. The device for testing the pile tip resistance at the variable cross-section of the composite riser pile according to claim 1, wherein the soil layer is made of non-draining homogeneous clay.
6. The device for testing the pile end resistance at the variable cross section of the riser composite pile according to claim 1, wherein the loading plate is a circular plate and is made of a wood plate, an iron plate or a composite plate.
7. The device for testing the resistance of the pile end at the variable cross section of the riser composite pile according to claim 1, wherein the pile body of the variable cross section pile is made of organic glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020639710.XU CN212129265U (en) | 2020-04-25 | 2020-04-25 | Pile end resistance testing device at variable cross section of composite pile of riser pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020639710.XU CN212129265U (en) | 2020-04-25 | 2020-04-25 | Pile end resistance testing device at variable cross section of composite pile of riser pipe |
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| CN212129265U true CN212129265U (en) | 2020-12-11 |
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| CN202020639710.XU Active CN212129265U (en) | 2020-04-25 | 2020-04-25 | Pile end resistance testing device at variable cross section of composite pile of riser pipe |
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