Cement mixing pile composite foundation bearing capacity detection device for building
By combining the tension adjustment component and the displacement monitoring component, the problems of terrain adaptability and detection accuracy in traditional static load tests are solved, and uniform force and safety are achieved in the detection without stone piers.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NUOXIN (GUANGDONG) ENG TESTING CO LTD
- Filing Date
- 2025-06-04
- Publication Date
- 2026-05-15
AI Technical Summary
Traditional static load tests require a large number of heavy items, are easily affected by weather and terrain, leading to inaccurate test results or safety risks, and are difficult to adapt to complex terrain.
By employing multiple tension adjustment components and embedded parts, the pressure of the auxiliary beam is adjusted by rotating the handwheel to drive the screw. Combined with the displacement monitoring component, it achieves the goal of eliminating the need for stone pier detection and adapting to different terrains.
It enables uniform stress detection in different terrains, improving the accuracy and safety of detection and reducing the requirements for terrain adaptability.
Smart Images
Figure CN224243970U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of building engineering testing technology, specifically a bearing capacity testing device for cement mixing pile composite foundations used in construction. Background Technology
[0002] The bearing capacity test of cement mixing pile composite foundation is a key step in evaluating the effectiveness of foundation treatment. It is mainly used to determine whether the composite foundation formed by the interaction between the pile and the soil between the piles meets the design bearing capacity requirements. It is a critical procedure to ensure the safety of the project and also an important data support to ensure the stability of the building in the future.
[0003] Traditional static load tests typically involve adding large objects, such as stone blocks, to the main beam to increase the lifting pressure of the jacks. This method requires the use of cranes, forklifts, and other tools to transport and lay the stone blocks.
[0004] However, traditional static load tests require the use of a large number of heavy objects such as stone piers, and these heavy objects need to be laid and stacked on top of the main beam. This stacking method is easily affected by weather (such as rain erosion) and uneven loading, which can cause the center of gravity of the stacked heavy objects to shift. This can lead to inaccurate test results or even collapse. In addition, traditional static load tests are difficult to adapt to complex terrain (such as slopes and narrow sites). Utility Model Content
[0005] The purpose of this utility model is to provide a bearing capacity testing device for cement mixing pile composite foundations in construction. Through multiple tension adjustment components, the tension on multiple auxiliary beams can be adjusted, thereby changing the pressure of multiple auxiliary beams on the main beam. It can adapt to the needs of testing work under different conditions and different terrains, so as to solve the technical problems mentioned in the background art.
[0006] To achieve the above objectives, this utility model provides the following technical solution:
[0007] The bearing capacity testing device for cement mixing pile composite foundation of building includes a main beam with a lifting component below it; multiple auxiliary beams are evenly arranged on the top of the main beam, and tension adjustment components are provided at both ends of the multiple auxiliary beams. The bottom of the multiple tension adjustment components is fixedly connected to multiple embedded parts; a displacement monitoring component is provided below the main beam.
[0008] The lifting assembly includes a lower pad, which is placed on top of a coarse sand pile, which is laid on a foundation. Multiple cement mixing piles are uniformly poured into the foundation, and the coarse sand pile corresponds to one of the cement mixing piles. A jack is placed in the middle of the top of the lower pad.
[0009] The tension adjustment assembly includes a lifting plate, a threaded cylinder coaxially fixedly connected to the lifting plate, and a screw threadedly connected to the inner side of the threaded cylinder; multiple connecting cylinders are evenly fixedly connected to the lifting plate, and the inner sides of the multiple connecting cylinders are respectively fixedly connected to multiple pull rods; the lifting plate is slidably connected to two sliding rods; the embedded part is evenly provided with multiple slots for receiving pull rods.
[0010] The tops of the multiple pull rods are fixedly connected to the bottoms of multiple tension sensors, the tops of the multiple tension sensors are fixedly connected to multiple lead screws, and the multiple lead screws are fixedly connected to the auxiliary beam through multiple threaded seats.
[0011] As a further technical solution of this utility model, the top of the screw is coaxially and fixedly connected to the handwheel; the bottom of the screw is rotatably connected to the bearing with a seat, and the bearing with a seat is fixedly connected to the middle of the top of the embedded part.
[0012] As a further technical solution of this utility model, the two slide rods are respectively located on both sides of the screw rod, and the top of the two slide rods are fixedly connected to the bottom of the auxiliary beam, and the bottom of the two slide rods are fixedly connected to the top of the embedded part.
[0013] As a further technical solution of this utility model, the top of the jack is fitted with the middle of the bottom of the upper pad, the top of the upper pad is fitted with the middle of the bottom of the main beam, and the width of the upper pad is greater than the width of the main beam.
[0014] As a further technical solution of this utility model, the oil inlet and oil outlet of the jack are respectively connected to the oil inlet and oil outlet of the oil pump through two oil supply pipes; an oil pressure sensor is installed on the oil pump.
[0015] As a further technical solution of this utility model, the displacement monitoring component includes multiple displacement sensors, which are evenly distributed in a ring on the outside of the jack; each of the multiple displacement sensors is fixedly connected to a data line, and the ends of the multiple data lines away from the displacement sensors are respectively connected to multiple data boxes.
[0016] As a further technical solution of this utility model, the bottom of the multiple data boxes is fixedly connected to the top of the two cross frames, which are located on both sides of the jack; positioning frames are fixedly connected to both ends of the two cross frames, and the lower ends of the multiple positioning frames are buried in the foundation.
[0017] Compared with the prior art, the beneficial effects of this utility model are:
[0018] 1. This utility model can drive the screw to rotate by rotating the handwheel, thereby driving the lifting plate to move downward. When the lifting plate moves downward, it can simultaneously drive multiple tie rods to move downward. The tie rods can generate tension on the auxiliary beam through the screw, thereby increasing the pressure of the auxiliary beam on the main beam. It can carry out inspection work without adding stone blocks or other items, and the pre-embedded parts have a small footprint and can be installed normally in different terrains.
[0019] 2. In this utility model, the lower pad plate can ensure that the coarse sand pile is subjected to uniform force, thereby ensuring that the cement mixing pile and the soil between the piles below the coarse sand pile are subjected to uniform force; the upper pad plate can ensure that the main beam is subjected to uniform force. Attached Figure Description
[0020] Figure 1 This is a three-dimensional structural diagram of the present invention.
[0021] Figure 2 This utility model Figure 1 Top view.
[0022] Figure 3 This utility model Figure 1 A partial structural diagram.
[0023] Figure 4 This utility model Figure 3 Side view.
[0024] Figure 5 This utility model Figure 3 A magnified view of a portion of the image.
[0025] Figure 6 This is a schematic diagram showing the connection between the auxiliary beam and the tension adjustment component of this utility model.
[0026] Figure 7 This utility model Figure 6 The main view.
[0027] Figure 8 This utility model Figure 6 Side view.
[0028] Figure 9 This utility model Figure 6 A magnified view of a portion of the image.
[0029] In the diagram: 1-Lifting assembly, 2-Displacement monitoring assembly, 3-Main beam, 4-Support pier, 5-Auxiliary beam, 6-Tension adjustment assembly, 7-Embedded part, 8-Foundation, 9-Cement mixing pile;
[0030] 11-Oil pump, 12-Oil pipe, 13-Oil pressure sensor, 14-Jack, 15-Lower pad, 16-Upper pad, 17-Coarse sand pile, 21-Horizontal frame, 22-Positioning frame, 23-Data cable, 24-Data box, 25-Displacement sensor, 61-Screw rod, 62-Tie rod, 63-Bearing with seat, 64-Lifting plate, 65-Tension sensor, 66-Threaded seat, 67-Screw rod, 68-Handwheel, 69-Threaded cylinder, 60-Connecting cylinder, 610-Slide rod. Detailed Implementation
[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0032] Please see Figure 1-9 In this embodiment of the utility model, the bearing capacity testing device for cement mixing pile composite foundation of building includes a main beam 3, a lifting component 1 is provided below the main beam 3; a plurality of auxiliary beams 5 are evenly provided on the top of the main beam 3, and tension adjustment components 6 are provided at both ends of the plurality of auxiliary beams 5, and the bottom of the plurality of tension adjustment components 6 is fixedly connected to a plurality of embedded parts 7 respectively; a displacement monitoring component 2 is provided below the main beam 3.
[0033] The lifting assembly 1 includes a lower pad 15, which is placed on top of a coarse sand pile 17. The coarse sand pile 17 is laid on a foundation 8. Multiple cement mixing piles 9 are uniformly poured in the foundation 8, and the coarse sand pile 17 corresponds to the position of one of the cement mixing piles 9. A jack 14 is placed in the middle of the top of the lower pad 15.
[0034] The tension adjustment assembly 6 includes a lifting plate 64, which is coaxially fixedly connected to a threaded cylinder 69, and a screw 67 is threadedly connected to the inner side of the threaded cylinder 69; a plurality of connecting cylinders 60 are evenly fixedly connected to the lifting plate 64, and the inner sides of the plurality of connecting cylinders 60 are respectively fixedly connected to a plurality of pull rods 62; the lifting plate 64 is slidably connected to two sliding rods 610; the embedded part 7 is evenly provided with a plurality of holes and slots for receiving the pull rods 62;
[0035] The tops of the multiple pull rods 62 are respectively fixedly connected to the bottoms of multiple tension sensors 65, the tops of the multiple tension sensors 65 are respectively fixedly connected to multiple lead screws 61, and the multiple lead screws 61 are respectively fixedly connected to the auxiliary beam 5 through multiple threaded seats 66.
[0036] The top of the screw 67 is coaxially and fixedly connected to the handwheel 68; the bottom of the screw 67 is rotatably connected to the bearing 63 with a seat, and the bearing 63 with a seat is fixedly connected to the middle of the top of the embedded part 7.
[0037] The two slide rods 610 are located on both sides of the screw 67, and the tops of the two slide rods 610 are fixedly connected to the bottom of the auxiliary beam 5, and the bottoms are fixedly connected to the top of the embedded part 7.
[0038] The top of the jack 14 is fitted with the bottom of the upper pad 16 in the middle, and the top of the upper pad 16 is fitted with the bottom of the main beam 3 in the middle, and the width of the upper pad 16 is greater than the width of the main beam 3.
[0039] By adopting the above technical solution, rotating the handwheel 68 can drive the screw 67 to rotate, thereby driving the lifting plate 64 to move downward. When the lifting plate 64 moves downward, it can simultaneously drive multiple tie rods 62 to move downward. The tie rods 62 can generate tension on the auxiliary beam 5 through the screw rod 61, thereby increasing the pressure of the auxiliary beam 5 on the main beam 3. This allows for inspection work to be carried out without adding stone blocks or other items. Furthermore, the embedded part 7 has a small footprint and can be installed normally in different terrains.
[0040] In this embodiment, the oil inlet and oil outlet of the jack 14 are respectively connected to the oil inlet and oil outlet of the oil pump 11 through two oil supply pipes 12; an oil pressure sensor 13 is installed on the oil pump 11.
[0041] The displacement monitoring component 2 includes multiple displacement sensors 25, which are evenly distributed in a ring on the outside of the jack 14. Each of the multiple displacement sensors 25 is fixedly connected to a data line 23, and the ends of the multiple data lines 23 away from the displacement sensors 25 are respectively connected to multiple data boxes 24.
[0042] The bottom of each of the data boxes 24 is fixedly connected to the top of two cross frames 21, which are located on both sides of the jack 14. Positioning frames 22 are fixedly connected to both ends of the two cross frames 21, and the lower ends of the multiple positioning frames 22 are buried in the foundation 8.
[0043] Furthermore, the oil pressure sensor 13, the multiple data boxes 24, and the multiple tension sensors 65 are all electrically connected to the processor.
[0044] By adopting the above technical solution, the lower pad 15 can ensure that the coarse sand pile 17 is subjected to uniform force, thereby ensuring that the cement mixing pile 9 and the soil between the piles below the coarse sand pile 17 are subjected to uniform force; the upper pad 16 can ensure that the main beam 3 is subjected to uniform force.
[0045] As a further explanation of the above embodiment, the auxiliary beam 5 is pulled by the tie rod 62 in conjunction with the lead screw 61, thereby increasing the pressure exerted by the auxiliary beam 5 on the main beam 3. The mechanical model and core formula are as follows:
[0046] Ideal rigid connection model
[0047] Tie rod 62 is perpendicular to auxiliary beam 5, and the auxiliary beam directly pulls down on the main beam 3 through the tie rod. The compressive force equals the tensile force, and friction and elastic deformation are ignored: F 压 =F 拉 ;
[0048] Principle: The tensile force is directly transmitted as a vertical compressive force through the rigid auxiliary beam 5, and the magnitude and direction of the force remain unchanged.
[0049] The connection method and working principle of the oil pressure sensor 13, multiple data boxes 24, and multiple tension sensors 65 with the processor are as follows:
[0050] I. Oil pressure sensor 13
[0051] 1. Connection method
[0052] The hydraulic pressure sensor 13 is directly connected to the processor (or data acquisition unit) via a shielded cable (such as a four-core or two-core cable). The cable must have anti-interference capabilities to avoid signal attenuation;
[0053] Some sensors integrate transmitter modules, outputting standard signals (such as 4-20mA current signals or 0-5V voltage signals), which can be directly connected to the processor's analog input channel;
[0054] The processor is typically equipped with a BNC interface (for analog signals) or an RJ45 interface (for digital signals, such as the Modbus protocol).
[0055] 2. Working principle
[0056] The strain gauge or piezoresistive element inside the oil pressure sensor 13 senses the oil pressure change of the jack 14 or oil pump 11, generates deformation, and converts it into a change in resistance value.
[0057] The resistance change is converted into a weak voltage signal (mV level) by a Wheatstone bridge, which is then amplified by an amplifier and output as a standard analog signal (such as 4-20mA or 0-10V) or a digital signal (such as RS485).
[0058] After receiving the signal, the processor converts the electrical signal into the actual oil pressure value (unit: MPa) according to the sensor's calibration coefficient (such as how many mA or voltage values 1MPa corresponds to), and displays or stores it in real time.
[0059] II. Data Box 24
[0060] 1. Connection method
[0061] Displacement sensor 25 (such as dial indicator, LVDT linear variable differential transformer or laser displacement meter) is connected to data box via data cable 23; dial indicator type sensor may transmit displacement count via pulse signal line, LVDT sensor transmits analog signal to signal conditioning module of data box via dedicated cable;
[0062] The data box 24 (also known as a signal conditioner or acquisition module) is connected to the processor via USB, RS232 / RS485 interface or Ethernet, and converts the raw signal from the displacement sensor 25 into a digital signal before uploading it.
[0063] 2. Working principle
[0064] Displacement measurement
[0065] Displacement sensor 25 directly measures the displacement change of the pile top or reference beam. For example, a dial indicator converts displacement into pointer rotation through mechanical transmission, and the data box 24 has a built-in encoder to read the pointer position;
[0066] LVDT: It uses the displacement of the iron core to change the inductance of the coil and outputs a voltage signal that is proportional to the displacement.
[0067] Signal conditioning
[0068] Data box 24 amplifies, filters, and performs analog-to-digital conversion (A / D conversion) on the sensor signal, removes noise, and converts the analog signal into a digital signal (e.g., 0-5V corresponds to 0-100mm displacement).
[0069] Data transmission
[0070] After receiving the digital signal, the processor calculates the actual displacement value (unit: mm) based on the sensor's range and accuracy, and plots the "load-settlement curve" (Qs curve).
[0071] III. Tension Sensor (65)
[0072] 1. Connection method
[0073] Hardware connection
[0074] The tension sensor 65 (such as a lever-type sensor) is connected to the processor via a cable, typically using a four-wire connection (two power lines and two signal lines).
[0075] Interface Protocol
[0076] Analog output: 4-20mA current signal or 0-10V voltage signal, which can be connected to the processor's analog output channel;
[0077] Digital output: Supports protocols such as Modbus and CANopen, and communicates with the processor via RS485 or CAN bus.
[0078] 2. Working principle
[0079] Force measurement: The elastic body of the tension sensor 65 undergoes a slight deformation under the tension of the tension rod 62, and the strain gauge attached to the elastic body changes its resistance value with the deformation;
[0080] Signal conversion: The Wheatstone bridge composed of strain gauges outputs a millivolt-level voltage signal, which is processed by an internal amplifier and an A / D converter to output an electrical signal proportional to the tensile force;
[0081] Data conversion: The processor converts the electrical signal into the actual tensile force value (unit: kN) based on the sensor's calibration coefficient (e.g., how many mA or digital value 1kN corresponds to), and uses it to calculate the bearing capacity of the composite foundation.
[0082] IV. Processor
[0083] 1. Core Functions
[0084] Signal acquisition: Simultaneously acquire multiple signals such as oil pressure, displacement, and tension to ensure consistent data timestamps;
[0085] Data processing: Real-time display and storage of data, automatic plotting of Qs curves, s-lgt curves, etc., and determination of whether the bearing capacity meets the standards according to specifications (such as the Technical Specification for Testing of Building Foundation Piles JGJ106);
[0086] Control function: Some processors can be linked with oil pumps to automatically apply graded loads, thereby automating the detection process.
[0087] V. Key Technical Points
[0088] 1. Sensor calibration
[0089] Before testing, all sensors must be calibrated to determine the conversion coefficient between electrical signals and physical quantities, ensuring data accuracy.
[0090] 2. Anti-interference measures
[0091] Shielded cables and grounding are used to avoid electromagnetic interference (such as from on-site welding machines, motors, and other equipment);
[0092] Displacement sensors must be securely fixed during installation to prevent vibration from affecting measurement accuracy.
[0093] 3. Standards and Basis
[0094] The testing process and data processing must comply with the requirements of standards such as the "Technical Specification for Building Foundation Treatment" (JGJ79) and the "Technical Specification for Composite Foundations" (GB / T23776).
[0095] The working principle of this utility model is as follows: rotating the handwheel 68 can drive the screw 67 to rotate, thereby driving the lifting plate 64 to move downward; when the lifting plate 64 moves downward, it can simultaneously drive multiple tie rods 62 to move downward, and the tie rods 62 can generate tension on the auxiliary beam 5 through the screw rod 61, thereby increasing the pressure of the auxiliary beam 5 on the main beam 3. It can carry out inspection work without adding stone blocks or other items, and the embedded part 7 has a small footprint and can be installed normally in different terrains.
[0096] The lower pad 15 ensures that the coarse sand pile 17 is subjected to uniform stress, thereby ensuring that the cement mixing pile 9 and the soil between the piles below the coarse sand pile 17 are subjected to uniform stress; the upper pad 16 ensures that the main beam 3 is subjected to uniform stress.
[0097] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A bearing capacity testing device for cement mixing pile composite foundations used in construction, characterized in that: Includes a main beam (3), under which a lifting assembly (1) is provided; multiple auxiliary beams (5) are evenly provided on the top of the main beam (3), and tension adjustment assemblies (6) are provided at both ends of the multiple auxiliary beams (5), and the bottom of the multiple tension adjustment assemblies (6) is fixedly connected to multiple embedded parts (7); a displacement monitoring assembly (2) is provided under the main beam (3); The lifting assembly (1) includes a lower pad (15) which is placed on top of a coarse sand pile (17) which is laid on a foundation (8). Multiple cement mixing piles (9) are uniformly poured in the foundation (8), and the coarse sand pile (17) corresponds to one of the cement mixing piles (9). A jack (14) is placed in the middle of the top of the lower pad (15). The tension adjustment assembly (6) includes a lifting plate (64), which is coaxially fixedly connected to a threaded cylinder (69), and the inner side of the threaded cylinder (69) is threadedly connected to a screw (67); the lifting plate (64) is evenly fixedly connected to multiple connecting cylinders (60), and the inner side of the multiple connecting cylinders (60) is fixedly connected to multiple pull rods (62); the lifting plate (64) is slidably connected to two sliding rods (610); the embedded part (7) is evenly provided with multiple holes and slots for receiving the pull rods (62); The tops of the multiple pull rods (62) are fixedly connected to the bottoms of the multiple tension sensors (65), the tops of the multiple tension sensors (65) are fixedly connected to the multiple lead screws (61), and the multiple lead screws (61) are fixedly connected to the auxiliary beam (5) through multiple threaded seats (66).
2. The bearing capacity testing device for cement mixing pile composite foundations for construction according to claim 1, characterized in that: The top of the screw (67) is coaxially and fixedly connected to the handwheel (68); the bottom of the screw (67) is rotatably connected to the seated bearing (63), which is fixedly connected to the top of the embedded part (7) in the middle.
3. The bearing capacity testing device for cement mixing pile composite foundations for construction according to claim 1, characterized in that: The two slide rods (610) are located on both sides of the screw (67), and the top of each slide rod (610) is fixedly connected to the bottom of the auxiliary beam (5), and the bottom of each slide rod (610) is fixedly connected to the top of the embedded part (7).
4. The bearing capacity testing device for cement mixing pile composite foundations for construction according to claim 1, characterized in that: The top of the jack (14) is in contact with the bottom of the upper pad (16) in the middle, and the top of the upper pad (16) is in contact with the bottom of the main beam (3) in the middle, and the width of the upper pad (16) is greater than the width of the main beam (3).
5. The bearing capacity testing device for cement mixing pile composite foundations for construction according to claim 1, characterized in that: The oil inlet and outlet of the jack (14) are respectively connected to the oil inlet and outlet of the oil pump (11) through two oil supply pipes (12); an oil pressure sensor (13) is installed on the oil pump (11).
6. The bearing capacity testing device for cement mixing pile composite foundations for construction according to claim 1, characterized in that: The displacement monitoring component (2) includes multiple displacement sensors (25), and the multiple displacement sensors (25) are evenly distributed in a ring on the outside of the jack (14); each of the multiple displacement sensors (25) is fixedly connected to a data line (23), and the end of the multiple data line (23) away from the displacement sensor (25) is respectively connected to multiple data boxes (24).
7. The bearing capacity testing device for cement mixing pile composite foundations for construction according to claim 6, characterized in that: The bottom of each of the data boxes (24) is fixedly connected to the top of the two cross frames (21), which are located on both sides of the jack (14). Both ends of the two cross frames (21) are fixedly connected to positioning frames (22), and the lower ends of the multiple positioning frames (22) are buried in the foundation (8).