A pile body strain separation testing device and method for easy installation of sensors

Abstract

The present invention discloses a pile body strain separation test device that is convenient for installing sensors. The device comprises a pile body, a concrete pile body strain test device, a steel pipe pile body strain test device, and a lifting assembly. The pile body comprises a concrete pile body and a steel pipe pile body connected together in a vertical direction. A reserved groove is dug in the concrete pile body and arranged along the axial direction of the concrete pile body. The concrete pile body strain test device is installed in the reserved groove. The steel pipe pile body strain test device is installed on the outer wall of the pile body and is installed on the outer wall of the pile body along the axial direction of the pile body. The lifting assembly is installed at the top or outside of the steel pipe pile body and is located above and to the side of the pile body. The lifting assembly is connected to the steel pipe pile body strain test device and is used to drive the steel pipe pile body strain test device to different positions of the steel pipe pile body, thereby measuring strain data at different positions of the steel pipe pile body. The strain gauge of the present invention can reach different positions as needed to collect strain data at the required positions.

Description

Technical Field

[0001] The present invention relates to the technical field of strain data testing devices and methods in engineering, and in particular to a pile body strain separation testing device and method that are convenient for installing sensors. Background Art

[0002] Currently, strain testing methods for pile bodies are typically performed by pre-fixing strain sensors to the pipe wall before driving the pile into the soil. For PHC piles, strain sensors are pre-installed on the steel cage or embedded in welded fittings during prefabrication. The sensors are then installed in these welded fittings and driven into the soil along with the pile. However, engineering experience shows that hammering large-diameter prefabricated piles typically generates impact forces exceeding 1,000 tons at the top of the pile. Each blow simultaneously sinks the pile and rebounds upward. This repetitive up-and-down impact can occur hundreds to thousands of times, generating significant dynamic strain in the pile body and even causing plastic deformation in some weak areas. This can damage the pre-embedded strain sensors and interfere with their initial parameters and sensitivity, affecting the accuracy of subsequent tests. Furthermore, with pre-embedded sensors, once the pile foundation for the strain sensor is selected, it cannot be changed. Consequently, the pile may not be driven to the designed elevation or may exceed it significantly. Both of these situations can prevent the sensor installation from being located in the designated soil layer and prevent the pile from being driven to the designed elevation. If the pile top is too long above the water surface due to the inability to reach the preset elevation, the pile often needs to be cut, which will render all pre-installed sensors useless. Furthermore, for prefabricated steel-concrete composite piles, two different processes are required to embed sensors due to changes in cross-sectional area, variable wall thickness, variable stiffness, and the presence of connection joints. Factory installation is labor-intensive and time-consuming, impacting the construction schedule. Therefore, there is an urgent need for an integrated strain sensor installation device and method that can efficiently and quickly install strain sensors on the upper concrete pipe pile and the lower steel pipe pile, respectively. The sensor installation position can also be flexibly adjusted according to demand to obtain accurate test parameters. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a pile body strain separation testing device and method that is easy to install sensors, which can solve the technical problems described in the background technology.

[0004] The technical solution for achieving the purpose of the present invention is: a pile body strain separation test device that is convenient for installing sensors, comprising a pile body, a concrete pile body strain test device, a steel pipe pile body strain test device and a pulling assembly, wherein the pile body comprises a concrete pile body and a steel pipe pile body connected together along a vertical direction, a reserved groove is dug on the concrete pile body, the reserved groove is arranged along the axial direction of the concrete pile body, the concrete pile body strain test device is installed in the reserved groove, the steel pipe pile body strain test device is installed on the outer side wall of the pile body and is installed on the outer side wall of the pile body along the axial direction of the pile body, the pulling assembly is installed at the top or outside of the steel pipe pile body and is located above the side of the pile body, the pulling assembly is connected to the steel pipe pile body strain test device, and is used to drive the steel pipe pile body strain test device to reach different positions of the steel pipe pile body, so that strain data at different positions of the steel pipe pile body can be measured.

[0005] Furthermore, the lower end of the concrete pile body is connected to the upper end of the steel pipe pile body through a connecting piece, thereby connecting and assembling the concrete pile body and the steel pipe pile body together.

[0006] Furthermore, the concrete pile body strain testing device includes a concrete strain testing assembly and a closed membrane bag, the closed membrane bag is installed on an outer side wall of the concrete strain testing assembly, the closed membrane bag is between the concrete strain testing assembly and the inner wall of the reserved groove, the concrete strain testing assembly includes a mounting frame, a plurality of strain gauges and a channel group, the closed membrane bag is fixedly or detachably installed on an outer side wall of the mounting frame, the channel group is arranged in the inner cavity of the mounting frame and along the axial direction of the mounting frame, each strain gauge is installed on the outer wall of the mounting frame away from the closed membrane bag, each strain gauge is arranged at intervals and along the axial direction of the mounting frame, each strain gauge is connected together by a wire, one end of the wire is connected to the strain gauge, and the other end passes through the channel group and is connected together,

[0007] Among them, the channel group includes at least a first channel group and a second channel group that are isolated from each other. A number of channels are set on the first channel group and the second channel group. The wires connected to the strain gauge are connected together through the first channel group. The output end of the second channel group is through-connected to the closed membrane bag, and the input end of the second channel group is used to connect with the grouting pipe so that the cement slurry injected into the grouting pipe can flow into the closed membrane bag through the grouting pipe and the second channel group.

[0008] Furthermore, the concrete pile body strain testing device includes a plurality of concrete strain testing assemblies, each of which is connected together in sequence, and the closed film bag is attached to an outer side wall of each concrete strain testing assembly along the axial direction of each concrete strain testing assembly.

[0009] Furthermore, the reserved groove is adapted to the concrete pile body strain testing device in size, so that the concrete pile body strain testing device completely occupies the entire reserved groove.

[0010] Furthermore, the steel pipe pile body strain testing device includes a steel pipe strain testing assembly and a closed film bag, the closed film bag is fitted on the side wall of the steel pipe strain testing assembly close to the steel pipe pile body, and the closed film bag is arranged along the axial direction of the steel pipe strain testing assembly, the closed film bag is between the steel pipe strain testing assembly and the steel pipe pile body, the steel pipe strain testing assembly includes a mounting frame, a plurality of strain gauges and a channel group, the closed film bag is fixedly or detachably mounted on an outer side wall of the mounting frame, the channel group is arranged in the inner cavity of the mounting frame and arranged along the axial direction of the mounting frame, each strain gauge is mounted on the outer wall of the mounting frame on the other side away from the closed film bag, each strain gauge is arranged at intervals and along the axial direction of the mounting frame, each strain gauge is connected together by a wire, one end of the wire is connected to the strain gauge and, the other end passes through the channel group and is connected together,

[0011] Among them, the channel group includes at least a first channel group and a second channel group that are isolated from each other. A number of channels are set on the first channel group and the second channel group. The wires connected to the strain gauge are connected together through the first channel group. The output end of the second channel group is through-connected to the closed membrane bag, and the input end of the second channel group is used to connect with the grouting pipe so that the cement slurry injected into the grouting pipe can flow into the closed membrane bag through the grouting pipe and the second channel group.

[0012] Furthermore, the steel pipe pile body strain testing device includes several steel pipe strain testing assemblies, each of which is connected together in sequence, and the closed film bag is attached to an outer side wall of each steel pipe strain testing assembly along the axial direction of each steel pipe strain testing assembly.

[0013] The lifting mechanism is a kind of by-product of the present invention, and its both ends are to be fixed on the supporting tractor, and the supporting tractor of the present invention is to be fixed on the supporting tractor of the present invention.

[0014] One end of the lower pulley wire rope is wound around the lower pulley, and the other end is connected to a wire conduit. The wire conduit is mounted on the mounting plate and arranged along the axial direction of the mounting plate.

[0015] Furthermore, it also includes a protective shell assembly, which is installed on one side of the pile body, and a groove is provided between the protective shell assembly and the outer wall of the pile body, and the steel pipe pile body strain testing device is installed in the groove. The protective shell assembly includes a first layer of steel protective shell, a second layer of concrete protective shell and a third layer of steel protective shell, and the first layer of steel protective shell, the second layer of concrete protective shell and the third layer of steel protective shell are arranged in sequence along the radial direction of the pile body away from the center of the circle.

[0016] A pile body strain separation testing method that is convenient for installing sensors is provided, and the method uses the pile body strain separation testing device that is convenient for installing sensors, comprising the following steps:

[0017] Step 1: When making a concrete pile body, a reserved groove is made, and a concrete pile body strain testing device is placed in the reserved groove, and the strain gauge on the concrete pile body strain testing device is aligned with the position of the concrete pile body where the strain needs to be measured, and a protective shell assembly is installed on one side of the pile body, and the steel pipe pile body strain testing device is placed in the groove between the protective shell assembly and the pile body, and the lifting assembly is connected to the steel pipe pile body strain testing device, thereby assembling the pile body strain separation testing device;

[0018] Step 2: Sinking the assembled pile body strain separation test device. After the pile sinking is completed, according to the current pile top elevation, the depth of the groove and the position of the strain test end face, the strain gauge data volume of the steel pipe pile body strain test device is adjusted, and the depth of the strain gauge in the groove is adjusted by a pulling assembly, so that each strain gauge reaches a preset position and can measure the position to be measured of the steel pipe pile body;

[0019] Step 3: Inject cement slurry through the corresponding grouting pipes of the steel pipe pile body strain test device and the concrete pile body strain test device, and inject the cement slurry into the closed film bag. The closed film bag expands to attach the strain gauges of the steel pipe pile body strain test device and the concrete pile body strain test device to the steel pipe pile body and the concrete pile body respectively;

[0020] Step 4: Connect the strain gauge to an external test instrument and perform a static load test on the concrete pile and the steel pipe pile. During the static load test, the load acts on the strain gauge to collect strain data. Based on the strain data, the pile body transfer law is obtained to complete the strain test.

[0021] The present invention has the following beneficial effects: the present invention can adjust the lowering depth of the steel pipe pile body strain testing device as needed, so that the strain gauge of the steel pipe pile body strain testing device can reach different positions of the steel pipe pile body as needed, thereby collecting strain data at the desired position. It also avoids the problem of traditionally installing the sensor in the pile body before pile sinking, which may cause damage to the sensor during hammering. Furthermore, the assembled concrete pile body strain testing device is placed in a reserved groove, the wire extending from the channel is tightened, and grouting pipes of different lengths are sequentially inserted. The extended grouting pipes are connected to a high-pressure grouting pump. High-pressure cement mortar is injected into the closed membrane bag through the high-pressure grouting pump and the grouting pipe, so that the closed membrane bag presses against the wall of the reserved groove, reacting to the strain gauge on the other side to adhere to the wall of the reserved groove. In this way, the concrete pile body strain testing device can be placed through the reserved groove to a specified position according to the actual depth after pile sinking, and then grouting is performed to fix it. The outside of the steel pipe pile body strain testing device is installed with the first layer of steel protective shell, the second layer of concrete protective shell and the third layer of steel protective shell in sequence. Through the protective shell assembly and the groove between the protective shell assembly and the outer wall of the pile body, it can not only stop water but also buffer soil extrusion, achieving double protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of a concrete pile body and a steel pipe pile body installed together according to the present invention;

[0023] Figure 2 for Figure 1 A magnified view of point A;

[0024] Figure 3 for Figure 1Enlarged view of point B;

[0025] Figure 4 Schematic diagram of the structure of the second strain gauge wire integration device of the present invention;

[0026] Figure 5 It is a structural schematic diagram of the mounting member of the present invention;

[0027] Figure 6 This is a schematic diagram of the connection between the mounting piece and the closed film bag of the present invention;

[0028] Figure 7 This is a schematic diagram of the assembly of the relevant components including the upper pulley and the lower pulley of the present invention;

[0029] Figure 8 An exploded view of the retractable strain gauge mounting device of the present invention;

[0030] Figure 9 for Figure 8 Enlarged view of point C.

[0031] In the figure: 1 - concrete pile body; 2 - steel pipe pile body; 3 - connecting piece; 4 - reserved groove; 5 - first layer of steel protective shell; 6 - second layer of concrete protective shell; 7 - third layer of steel protective shell; 8 - upper pulley; 9 - lower pulley; 10 - lower pulley wire rope; 11 - upper pulley wire rope; 12 - steel pipe pile body strain test device; 121 - steel pipe strain test assembly; 13 - concrete pile body strain test device; 131 - concrete strain test assembly; 14 - mounting frame; 15 - channel; 16 - closed membrane bag; 17 - strain gauge; 171 - conductor; 18 - mounting plate; 181 - telescopic rod; 182 - counterweight. DETAILED DESCRIPTION

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0033] like Figure 1 - Figure 9As shown, a pile body strain separation test device that is convenient for installing sensors includes a pile body, a concrete pile body strain test device 13, a steel pipe pile body strain test device 12, and a lifting assembly. The pile body includes a concrete pile body 1 and a steel pipe pile body 2 connected together along the vertical direction. A reserved groove 4 is dug in the concrete pile body 1 and arranged along the axial direction of the concrete pile body 1. The concrete pile body strain test device 13 is installed in the reserved groove 4. The steel pipe pile body strain test device 12 is installed on the outer wall of the pile body and is installed on the outer wall of the pile body along the axial direction of the pile body, that is, it is arranged along the axial direction of the concrete pile body 1 and the steel pipe pile body 2. The lifting assembly is installed at the top or outside of the steel pipe pile body 2 and is located above the pile body. The lifting assembly is connected to the steel pipe pile body strain test device 12 and is used to drive the steel pipe pile body strain test device 12 to different positions on the steel pipe pile body 2, thereby measuring strain data at different positions on the steel pipe pile body 2.

[0034] In an optional embodiment, the lower end of the concrete pile body 1 is connected to the upper end of the steel pipe pile body 2 via a connector 3 , thereby connecting and assembling the concrete pile body 1 and the steel pipe pile body 2 together.

[0035] The concrete pile body strain testing device 13 includes a concrete strain testing assembly 131 and a closed membrane bag 16. The closed membrane bag 16 is mounted on an outer wall of the concrete strain testing assembly 131, so that the closed membrane bag 16 is interposed between the concrete strain testing assembly 131 and the inner wall of the reserved groove 4. The concrete strain testing assembly 131 includes a mounting frame 14, a plurality of strain gauges 17, and a channel group 15. The closed membrane bag 16 is fixedly or removably mounted on an outer wall of the mounting frame 14. The channel group 15 is disposed within the inner cavity of the mounting frame 14 and arranged axially along the mounting frame 14. The strain gauges 17 are mounted on the outer wall of the mounting frame 14 away from the closed membrane bag 16. The strain gauges 17 are spaced apart and arranged axially along the mounting frame 14 to facilitate measuring strain data at different locations on the concrete pile body 1. The strain gauges 17 are connected together by a wire 171 , one end of which is connected to the strain gauge 17 and to an external data receiving device (such as a computer), and the other end of which passes through the channel group 15 and is connected together, thereby integrating the strain gauges 17 on the mounting frame 14 .

[0036] The channel group 15 includes at least a first channel group 15 and a second channel group 15, which are isolated from each other. That is, the first channel group 15 and the second channel group 15 are not connected to each other, and each of the first channel group 15 and the second channel group 15 is provided with a plurality of channels. The wires 171 connected to the strain gauge 17 are connected together through the first channel group 15. The output end of the second channel group 15 is connected to the closed membrane bag 16, and the input end of the second channel group 15 is connected to the grouting pipe, so that cement slurry injected into the grouting pipe can flow into the closed membrane bag 16 through the grouting pipe and the second channel group 15.

[0037] In an optional embodiment, the concrete pile body strain testing device 13 includes a plurality of concrete strain testing assemblies 131, each of which is connected together in sequence, and the closed membrane bag 16 is attached to an outer side wall of each concrete strain testing assembly 131 along the axial direction of each concrete strain testing assembly 131.

[0038] In an optional embodiment, the reserved groove 4 is sized to match the concrete pile body strain testing device 13, so that the concrete pile body strain testing device 13 completely occupies the entire reserved groove 4. In other words, the lateral size and length of the concrete pile body strain testing device 13 are respectively adapted to the width and length of the reserved groove 4, so that the concrete pile body strain testing device 13 occupies the entire space of the reserved groove 4.

[0039] The steel pipe pile body strain testing device 12 comprises a steel pipe strain testing assembly 121 and a closed membrane bag 16. The closed membrane bag 16 is attached to the side wall of the steel pipe strain testing assembly 121 near the steel pipe pile body 2 and is arranged axially along the steel pipe strain testing assembly 121, thereby being interposed between the steel pipe strain testing assembly 121 and the steel pipe pile body 2. The steel pipe strain testing assembly 121 comprises a mounting frame 14, a plurality of strain gauges 17, and a channel group 15. The closed membrane bag 16 is fixedly or removably attached to an outer wall of the mounting frame 14. The channel group 15 is disposed within the inner cavity of the mounting frame 14 and arranged axially along the mounting frame 14. The strain gauges 17 are mounted on the outer wall of the mounting frame 14 on the other side away from the closed membrane bag 16. The strain gauges 17 are spaced apart and arranged axially along the mounting frame 14 to facilitate measuring strain data at different positions of the steel pipe pile body 2. The strain gauges 17 are connected together by a wire 171 , one end of which is connected to the strain gauge 17 and to an external data receiving device (such as a computer), and the other end of which passes through the channel group 15 and is connected together, thereby integrating the strain gauges 17 on the mounting frame 14 .

[0040] The channel group 15 includes at least a first channel group 15 and a second channel group 15, which are isolated from each other. That is, the first channel group 15 and the second channel group 15 are not connected to each other, and each of the first channel group 15 and the second channel group 15 is provided with a plurality of channels. The wires 171 connected to the strain gauge 17 are connected together through the first channel group 15. The output end of the second channel group 15 is connected to the closed membrane bag 16, and the input end of the second channel group 15 is connected to the grouting pipe, so that cement slurry injected into the grouting pipe can flow into the closed membrane bag 16 through the grouting pipe and the second channel group 15.

[0041] In an optional embodiment, the steel pipe pile body strain testing device 12 includes a plurality of steel pipe strain testing assemblies 121, each of which is connected together in sequence, and the closed membrane bag 16 is attached to an outer side wall of each steel pipe strain testing assembly 121 along the axial direction of each steel pipe strain testing assembly 121.

[0042] The lifting assembly includes a mounting bracket (not shown in the figure), an upper pulley 8, a lower pulley 9, an upper pulley wire rope 11, a lower pulley wire rope 10, a mounting plate 18, a plurality of telescopic rods 181 and a counterweight block 182. The upper pulley 8 and the lower pulley 9 are installed at intervals on the mounting bracket, and the mounting bracket can be directly installed on the top of the concrete pile body 1 or directly installed on the outside. One end of the upper pulley wire rope 11 is wrapped around the upper pulley 8, and the other end passes through each telescopic rod 181 in turn and is fixedly connected to the counterweight 182. The counterweight 182 is located below the telescopic rod 181 farthest away from the upper pulley 8. Each telescopic rod 181 is arranged at equal intervals along the axial direction of the strain test assembly of the steel pipe pile body 2. The two ends of the telescopic rod 181 are respectively slidably in contact between the closed membrane bag 16 and the mounting plate 18. The telescopic rod 181 can slide downward along the axial direction of the steel pipe strain test assembly 121 under the action of the gravity of the counterweight 182, and under the action of the external force pulling the upper pulley wire rope 11 upward, the telescopic rod 181 is pulled to slide upward along the axial direction of the steel pipe strain test assembly 121. As the telescopic rod 181 slides downward, it expands laterally, acting on the closed membrane bag 16, causing the closed membrane bag 16 to fit more tightly against the outer wall of the strain test assembly of the steel pipe pile body 2. This in turn applies the strain force on the other side of the outer wall of the strain test assembly of the steel pipe pile body 2 to the steel pipe pile body 2, thereby enabling the strain force to measure the strain data of the steel pipe pile body 2. Conversely, when it is no longer necessary to collect strain data, the pulley wire rope 11 is pulled upward by hand or other external force, thereby driving the telescopic rod 181 to slide upward, causing the telescopic rod 181 to contract laterally, thereby eliminating the external force acting on the closed membrane bag 16. This in turn causes the closed membrane bag 16 to no longer exert a force on the strain test assembly of the steel pipe pile body 2, causing the strain gauge 17 to no longer fit tightly against the steel pipe pile body 2.

[0043] One end of the lower pulley wire rope 10 is wound around the lower pulley 9 , and the other end is connected to a wire conduit (not shown in the figure). The wire conduit is installed on the mounting plate 18 and arranged along the axial direction of the mounting plate 18 .

[0044] In an optional embodiment, the pile body further includes a protective shell assembly, which is mounted on one side of the pile body, and a groove is provided between the protective shell assembly and the outer wall of the pile body, and the steel pipe pile body strain testing device 12 is installed in the groove. The protective shell assembly includes a first layer of steel protective shell 5, a second layer of concrete protective shell 6, and a third layer of steel protective shell 7. The first layer of steel protective shell 5, the second layer of concrete protective shell 6, and the third layer of steel protective shell 7 are arranged in sequence along the radial direction of the pile body away from the center of the circle, that is, the first layer of steel protective shell 5 is closest to the pile body, and the third layer of steel protective shell 7 is farthest from the pile body.

[0045] The present invention can adjust the lowering depth of the steel pipe pile body strain testing device 12 as needed, so that the strain gauge 17 of the steel pipe pile body strain testing device 12 can reach different positions of the steel pipe pile body 2 as needed, thereby collecting strain data at the desired position. It can also avoid the problem of traditional sensors being installed in the pile body before pile sinking, which may cause sensor damage during hammering. In addition, the assembled concrete pile body strain testing device 13 is placed in the reserved groove 4, the wire 171 extending from the channel group 15 is tightened, and grouting pipes of different lengths are inserted in sequence. The extended grouting pipes are connected to a high-pressure grouting pump. High-pressure cement mortar is injected into the closed film bag 16 through the high-pressure grouting pump and the grouting pipe, so that the closed film bag 16 presses against the groove wall of the reserved groove 4, reacting to the strain gauge 17 on the other side to adhere to the groove wall of the reserved groove 4. In this way, the concrete pile body strain testing device 13 can be placed in the reserved groove 4 to a specified position according to the actual depth after pile sinking, and then grouting is performed to fix it. The outside of the steel pipe pile body strain testing device 12 is sequentially installed with a first layer of steel protective shell 5, a second layer of concrete protective shell 6 and a third layer of steel protective shell 7. Through the protective shell assembly and the groove between the protective shell assembly and the outer wall of the pile body, it can both stop water and buffer soil extrusion, thereby achieving double protection.

[0046] In actual use, in order to adjust the position of the strain gauge 17 as needed to measure the strain data at different positions of the pile body and complete the strain test, follow the steps below:

[0047] Step 1: Create a reserved groove 4 when manufacturing the concrete pile body 1. Place the concrete pile body strain test device 13 into the reserved groove 4, ensuring that the strain gauge 17 on the concrete pile body strain test device 13 is aligned with the position of the concrete pile body 1 where the strain needs to be measured. Install the protective shell assembly on one side of the pile body, place the steel pipe pile body strain test device 12 into the groove between the protective shell assembly and the pile body, and connect the lifting assembly to the steel pipe pile body strain test device 12. This completes the assembly of the separate pile body strain test device.

[0048] Step 2: The assembled pile body strain separation testing device is subjected to pile sinking. After the pile sinking is completed, the data volume of the strain gauge 17 of the steel pipe pile body strain testing device 12 is adjusted according to the current pile top elevation, the depth of the groove and the position of the strain test end face, and the depth of the strain gauge 17 in the groove is adjusted by the pulling assembly, so that each strain gauge 17 reaches a preset position and can measure the position to be measured of the steel pipe pile body 2.

[0049] Step 3: Cement slurry is injected through the corresponding grouting pipes of the steel pipe pile body strain testing device 12 and the concrete pile body strain testing device 13. The cement slurry is injected into the closed film bag 16. The closed film bag 16 expands to fit the strain gauges 17 of the steel pipe pile body strain testing device 12 and the concrete pile body strain testing device 13 respectively on the steel pipe pile body 2 and the concrete pile body 1.

[0050] Step 4: Connect the strain gauge 17 to an external testing instrument and perform a static load test on the concrete pile body 1 and the steel pipe pile body 2. During the static load test, the load acts on the strain gauge 17, thereby collecting strain data. Based on the strain data, the pile body transfer law is obtained to complete the strain test.

[0051] The embodiment disclosed in this specification is merely an illustration of one aspect of the present invention. The scope of protection of the present invention is not limited to this embodiment. Any other functionally equivalent embodiments fall within the scope of protection of the present invention. Those skilled in the art can make various other corresponding changes and modifications based on the technical solutions and concepts described above, and all such changes and modifications should fall within the scope of protection of the claims of the present invention.

Claims

1. A pile strain separation testing device that is convenient for installing sensors, characterized in that: The utility model comprises a pile body, a concrete pile body strain testing device, a steel pipe pile body strain testing device and a pulling assembly. The pile body comprises a concrete pile body and a steel pipe pile body connected together in a vertical direction. A reserved groove is dug on the concrete pile body, and the reserved groove is arranged along the axial direction of the concrete pile body. The concrete pile body strain testing device is installed in the reserved groove. The steel pipe pile body strain testing device is installed on the outer side wall of the pile body and is installed on the outer side wall of the pile body along the axial direction of the pile body. The pulling assembly is installed on the top or outside of the steel pipe pile body and is located on the upper side of the pile body. The pulling assembly is connected to the steel pipe pile body strain testing device and is used to drive the steel pipe pile body strain testing device to reach different positions of the steel pipe pile body, so that the strain data at different positions of the steel pipe pile body can be measured. The lower end of the concrete pile body is connected to the upper end of the steel pipe pile body through a connector, thereby connecting and assembling the concrete pile body and the steel pipe pile body together. The concrete pile body strain testing device includes a concrete strain testing assembly and a closed membrane bag. The closed membrane bag is installed on an outer side wall of the concrete strain testing assembly. The closed membrane bag is between the concrete strain testing assembly and the inner wall of the reserved groove. The concrete strain testing assembly includes a mounting frame, a plurality of strain gauges and a channel group. The closed membrane bag is fixedly or detachably installed on an outer side wall of the mounting frame. The channel group is arranged in the inner cavity of the mounting frame and along the axial direction of the mounting frame. Each strain gauge is installed on the outer wall of the mounting frame away from the closed membrane bag. Each strain gauge is arranged at intervals and along the axial direction of the mounting frame. Each strain gauge is connected together by a wire. One end of the wire is connected to the strain gauge, and the other end passes through the channel group and is connected together. Among them, the channel group includes at least a first channel group and a second channel group that are isolated from each other. A number of channels are set on the first channel group and the second channel group. The wires connected to the strain gauge are connected together through the first channel group. The output end of the second channel group is through-connected to the closed membrane bag, and the input end of the second channel group is used to connect with the grouting pipe so that the cement slurry injected into the grouting pipe can flow into the closed membrane bag through the grouting pipe and the second channel group.

2. The pile body strain separation testing device that is convenient for installing sensors according to claim 1 is characterized in that: The concrete pile body strain testing device comprises a plurality of concrete strain testing assemblies, which are sequentially connected together, and a closed film bag is attached to an outer side wall of each concrete strain testing assembly along the axial direction of each concrete strain testing assembly.

3. The pile body strain separation testing device that is convenient for installing sensors according to claim 2, characterized in that: The reserved groove is adapted to the concrete pile body strain testing device in size, so that the concrete pile body strain testing device completely occupies the entire reserved groove.

4. The pile body strain separation testing device that is convenient for installing sensors according to claim 3 is characterized in that: The steel pipe pile body strain testing device includes a steel pipe strain testing assembly and a closed film bag. The closed film bag is fitted on the side wall of the steel pipe strain testing assembly close to the steel pipe pile body, and the closed film bag is arranged along the axial direction of the steel pipe strain testing assembly. The closed film bag is between the steel pipe strain testing assembly and the steel pipe pile body. The steel pipe strain testing assembly includes a mounting frame, a plurality of strain gauges and a channel group. The closed film bag is fixedly or detachably mounted on an outer side wall of the mounting frame. The channel group is arranged in the inner cavity of the mounting frame and arranged along the axial direction of the mounting frame. Each strain gauge is mounted on the outer wall of the mounting frame on the other side away from the closed film bag. Each strain gauge is arranged at intervals and along the axial direction of the mounting frame. Each strain gauge is connected together by a wire. One end of the wire is connected to the strain gauge and the other end passes through the channel group and is connected together. Among them, the channel group includes at least a first channel group and a second channel group that are isolated from each other. A number of channels are set on the first channel group and the second channel group. The wires connected to the strain gauge are connected together through the first channel group. The output end of the second channel group is through-connected to the closed membrane bag, and the input end of the second channel group is used to connect with the grouting pipe so that the cement slurry injected into the grouting pipe can flow into the closed membrane bag through the grouting pipe and the second channel group.

5. The pile body strain separation testing device that is convenient for installing sensors according to claim 4, characterized in that: The steel pipe pile body strain testing device includes several steel pipe strain testing assemblies, which are connected together in sequence. The closed film bag is attached to an outer side wall of each steel pipe strain testing assembly along the axial direction of each steel pipe strain testing assembly.

6. The pile body strain separation testing device that is convenient for installing sensors according to claim 5, characterized in that: Base comprises support, castor, and frame upper is provided with guide rail, and support and conveyer frames movable end contact site are provided with recoil spring or rubber cushion, and castor is arranged on the pin of base bottom four, to carry mobile handler location. One end of the lower pulley wire rope is wound around the lower pulley, and the other end is connected to a wire conduit. The wire conduit is mounted on the mounting plate and arranged along the axial direction of the mounting plate.

7. The pile body strain separation testing device for facilitating sensor installation according to claim 6, characterized in that: It also includes a protective shell assembly, which is installed on one side of the pile body, and a groove is provided between the protective shell assembly and the outer side wall of the pile body, and the steel pipe pile body strain testing device is installed in the groove. The protective shell assembly includes a first layer of steel protective shell, a second layer of concrete protective shell and a third layer of steel protective shell. The first layer of steel protective shell, the second layer of concrete protective shell and the third layer of steel protective shell are arranged in sequence along the radial direction of the pile body away from the center of the circle.

8. A pile body strain separation testing method that is convenient for installing sensors, applied to the pile body strain separation testing device that is convenient for installing sensors as claimed in claim 7, characterized in that: The following steps are involved: Step 1: When making a concrete pile body, a reserved groove is made, and a concrete pile body strain testing device is placed in the reserved groove, and the strain gauge on the concrete pile body strain testing device is aligned with the position of the concrete pile body where the strain needs to be measured, and a protective shell assembly is installed on one side of the pile body, and the steel pipe pile body strain testing device is placed in the groove between the protective shell assembly and the pile body, and the lifting assembly is connected to the steel pipe pile body strain testing device, thereby assembling the pile body strain separation testing device; Step 2: After the pile body strain separation test device is assembled, pile sinking begins. After the pile sinking is completed, the strain gauge data volume of the steel pipe pile body strain test device is adjusted according to the current pile top elevation, the depth of the groove, and the position of the strain test end face. The strain gauge depth in the groove is adjusted by the pulling assembly, so that each strain gauge reaches the preset position and can measure the position to be measured on the steel pipe pile body; Step 3: Inject cement slurry through the corresponding grouting pipes of the steel pipe pile body strain test device and the concrete pile body strain test device, and inject the cement slurry into the closed film bag. The closed film bag expands to attach the strain gauges of the steel pipe pile body strain test device and the concrete pile body strain test device to the steel pipe pile body and the concrete pile body respectively; Step 4: Connect the strain gauge to an external test instrument and perform a static load test on the concrete pile and the steel pipe pile. During the static load test, the load acts on the strain gauge to collect strain data. Based on the strain data, the pile body transfer law is obtained to complete the strain test.

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