Monitoring construction method and device for open caisson foundation and storage medium
By installing and calibrating soil pressure sensors and stress sensors on the bottom steel shell of the caisson foundation, the problem of monitoring data distortion is solved, and accurate monitoring and data analysis of the caisson foundation construction process is achieved.
Patent Information
- Application Number
- CN202410064412.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-11-30
- Filing Date
- 2024-01-16
- Publication Date
- 2025-05-30
AI Technical Summary
Monitoring of caisson foundations in the prior art causes distortion of monitoring data due to the installation of soil pressure sensors and stress sensors, which affects the data analysis of caisson foundations during floating transportation, water injection implantation and later construction stages.
By installing a soil pressure sensor and a stress sensor on the blade foot of the bottom steel shell, and subtracting the actual monitoring value from the initial value to obtain monitoring data; calculate the theoretical water pressure borne by the soil pressure sensor during the floating process, and calculate the actual stress of the concrete in the blade foot based on the monitoring data of the stress sensor.
The actual monitoring values of soil pressure sensors and stress sensors are corrected, the accuracy of monitoring data is ensured, the sinking process and implantation of the bottom steel shell can be monitored in real time, and the data analysis accuracy of caisson foundation construction is improved.
Smart Images
Figure CN120061409A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of bridge construction, and particularly relates to a monitoring construction method, device and storage medium for a caisson foundation. Background Art
[0002] At present, bridges are developing towards the direction of deep water, long span and co - construction of multiple traffic functions. Therefore, the requirements for bridge foundations are getting higher and higher, mainly reflected in aspects such as good integrity, small stress deformation, and strong scour resistance of the bridge foundation.
[0003] A caisson foundation is a well - shaped structure. It excavates soil from the well and sinks to the designed elevation after overcoming the skin friction of the well wall and the end resistance at the bottom of the caisson by its own gravity. Then, it is sealed with concrete at the bottom and the well holes are filled to make it the foundation of a bridge pier or other structures. The characteristics of the caisson foundation are that the buried depth can be very large, with strong integrity, good stability, a large bearing area, and the ability to bear large vertical and horizontal loads; the caisson is both a foundation and a cofferdam structure for retaining soil and water during construction. The construction process is simple and has little impact on the environment. It is especially suitable for bridges with large spans, heavy loads, and extremely high requirements for foundation settlement and differential settlement, so it is extremely widely used.
[0004] In order to monitor the end resistance at the bottom of the caisson foundation and the structural stress during the sinking process, earth pressure sensors and stress sensors are usually installed at the cutting edge for monitoring. However, due to installation reasons, the earth pressure sensors and stress sensors may cause the problem of distorted sensor detection data, and the distorted data will affect the data analysis of the caisson foundation during floating, water injection and landing, and the later construction stage. Summary of the Invention
[0005] The purpose of the present invention is to overcome the deficiencies in the prior art, and provide a monitoring construction method, device and storage medium for a caisson foundation, so as to solve the problem that the monitoring of the caisson foundation in the prior art may cause distorted sensor monitoring data due to the installation of earth pressure sensors and stress sensors.
[0006] The present invention provides the following technical solutions:
[0007] In a first aspect, a monitoring construction method for a caisson foundation is provided, including: manufacturing and assembling the bottom steel shell, installing earth pressure sensors and stress sensors on the cutting edges of the bottom steel shell, setting the actual monitoring value when the installation of the stress sensors is completed as the initial value of the stress sensors, subtracting the initial value of the stress sensors from the actual monitoring value of the stress sensors, and outputting the monitoring data of the stress sensors; floating the bottom steel shell to the position where it is to sink, calculating the theoretical water pressure borne by the earth pressure sensors, setting the theoretical water pressure as the initial value of the earth pressure sensors, subtracting the initial value of the earth pressure sensors from the actual monitoring value of the earth pressure sensors, and outputting the monitoring data of the earth pressure sensors; filling the bottom steel shell with water to land and pouring concrete; connecting and raising the remaining segments of the caisson foundation on site according to the construction plan, and taking soil to sink; pouring the bottom-sealing concrete.
[0008] Furthermore, it also includes, after the bottom-sealing concrete coagulates and solidifies, calculating the stress of the concrete inside the cutting edge according to the monitoring data of the stress sensors: establishing a finite element calculation model of the caisson foundation according to the actual structural conditions of the caisson foundation, and calculating the theoretical stress τ of the concrete inside the cutting edge at the installation position of the stress sensors 1 , and the theoretical stress τ of the steel plate of the cutting edge at the installation position of the stress sensors 2 ; obtaining the monitoring data τ of the stress sensors 3 ; calculating the actual stress of the concrete inside the cutting edge at the installation position of the stress sensors
[0009] Furthermore, during the floating process, the calculation method of the theoretical water pressure borne by the earth pressure sensors includes: measuring the depth h of the water at the position where the earth pressure sensors are located 1 ; calculating the theoretical water pressure p = ρgh 1 , where ρ is the density of water and g is the acceleration due to gravity.
[0010] Furthermore, it also includes, during the process of filling the bottom steel shell with water and sinking, determining whether the bottom steel shell has landed; when the monitoring data τ of the earth pressure sensors 5 < ρgh 2 , the bottom steel shell has not landed, where h 2 is the distance from the earth pressure sensors to the riverbed or seabed when the bottom steel shell is floated to the position where it is to sink; when the monitoring data τ of the earth pressure sensors 5 > ρgh 2 , the bottom steel shell has landed.
[0011] Furthermore, it also includes, during the process of filling the bottom steel shell with water and sinking, calculating the depth h of the water at the position where the bottom steel shell is located according to the monitoring data τ of the earth pressure sensors 5 h 1It is the depth of water corresponding to the theoretical water pressure borne by the earth pressure sensor on the bottom steel shell during the floating transportation process.
[0012] Furthermore, the monitoring direction of the stress sensor is the extending direction of the cutting edge.
[0013] Furthermore, the caisson foundation includes a well wall, partition walls and common walls; the partition walls are arranged inside the well wall and are used to divide the caisson foundation into multiple areas; the common walls are arranged inside the well wall and are used to divide the areas separated by the partition walls to form multiple well holes.
[0014] Furthermore, the cutting edge includes a first cutting edge arranged at the bottom of the well wall, a second cutting edge arranged at the bottom of the partition wall, and a third cutting edge arranged at the bottom of the common wall.
[0015] In a second aspect, a monitoring construction control device for a caisson foundation is provided, including a processor and a storage medium; the storage medium is used for storing instructions; the processor is used for operating according to the instructions to execute the steps of the method in the first aspect.
[0016] In a third aspect, a computer-readable storage medium is provided, on which a computer program is stored, and when the program is executed by a processor, the steps of the method in the first aspect are implemented.
[0017] Compared with the prior art, the beneficial effects of the present invention are:
[0018] 1. By subtracting the initial value of the earth pressure sensor from the actual monitoring value of the earth pressure sensor, the monitoring data of the earth pressure sensor is obtained; by subtracting the initial value of the stress sensor from the actual monitoring value of the stress sensor, the monitoring data of the stress sensor is obtained; thus, the purpose of correcting the actual monitoring values of the earth pressure sensor and the stress sensor is achieved.
[0019] 2. By calculating the depth h of the water at the position where the bottom steel shell is located during the sinking process before landing according to the monitoring data τ of the earth pressure sensor 5 ; on the one hand, the distance between the bottom steel shell and the water surface can be monitored in real time, and on the other hand, combined with the depth of the waterway, the distance between the cutting edge and the riverbed or seabed can be deduced, which is used as a method to evaluate whether the bottom steel shell is grounded during the floating transportation. 3 ; on the one hand, the distance between the bottom steel shell and the water surface can be monitored in real time, and on the other hand, combined with the depth of the waterway, the distance between the cutting edge and the riverbed or seabed can be deduced, which is used as a method to evaluate whether the bottom steel shell is grounded during the floating transportation.
[0020] 3. By comparing the calculation results of the monitoring data τ of the earth pressure sensor 5 and ρgh 2 , it is judged whether the bottom steel shell has landed, and an intuitive judgment can be made on whether the bottom of the caisson foundation is in contact with the riverbed.
[0021] 4. Since the monitoring data of the stress sensor represents the internal force of the steel plate outside the cutting edge rather than the stress of the concrete, the theoretical stress τ of the concrete inside the cutting edge is calculated by establishing a finite element calculation model of the caisson foundation. 1 and the theoretical stress τ of the steel plate outside the cutting edge 2 , and then through the monitoring data τ of the stress sensor 3 , the actual stress τ of the concrete is deduced more accurately. 4 Therefore, by setting stress sensors, the stress states of both the steel plate outside the cutting edge and the concrete inside the cutting edge can be obtained simultaneously. Description of the Drawings
[0022] Figure 1 It is a flowchart of the monitoring construction method of the caisson foundation in Embodiment 1 of the present invention.
[0023] Figure 2 It is a schematic diagram of the installation position of the stress sensor in Embodiment 1 of the present invention.
[0024] Figure 3 It is a schematic diagram of the installation position of the earth pressure sensor in Embodiment 1 of the present invention.
[0025] Figure 4 It is a schematic diagram of the structure of the first cutting edge in Embodiment 1 of the present invention.
[0026] Figure 5 It is a schematic diagram of the structure of the second cutting edge in Embodiment 1 of the present invention.
[0027] Figure 6 It is a schematic diagram of the structure of the third cutting edge in Embodiment 1 of the present invention.
[0028] Reference numerals in the figure: partition wall 1, stress sensor 2, shaft wall 3, ordinary partition wall 4, earth pressure sensor 5. Detailed Embodiments
[0029] The present invention will be further described below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and cannot be used to limit the protection scope of the present invention.
[0030] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by the terms "front", "rear", "left", "right", "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention rather than requiring the present invention to be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present invention.
[0031] Embodiment 1:
[0032] As Figure 1 shown, this embodiment provides a monitoring construction method for a caisson foundation, including the following steps:
[0033] Step 1: Manufacture and assemble the bottom section steel shell, install earth pressure sensors and stress sensors on the cutting edges of the bottom section steel shell, set the actual monitoring value when the installation of the stress sensors is completed as the initial value of the stress sensors, subtract the initial value of the stress sensors from the actual monitoring value of the stress sensors, and output the monitoring data of the stress sensors.
[0034] In this embodiment, in the dry dock of the factory, the bottom section steel shell is manufactured in blocks and assembled into a whole; after being assembled into a whole, earth pressure sensors and stress sensors are installed.
[0035] Step 2: Float the bottom section steel shell to the position where it is to be sunk, calculate the theoretical water pressure borne by the earth pressure sensors during the floating process, set the theoretical water pressure as the initial value of the earth pressure sensors, subtract the initial value of the earth pressure sensors from the actual monitoring value of the earth pressure sensors, and output the monitoring data of the earth pressure sensors.
[0036] In this embodiment, the bottom section steel shell is floated to the position where it is to be sunk by means of equipment such as tugboats or semi-submersible barges.
[0037] In this embodiment, during the floating process, the calculation method of the theoretical water pressure borne by the earth pressure sensors includes: measuring the depth h of the water where the earth pressure sensors are located 1 , which can be measured by a water gauge or other automatic measuring instruments; calculating the theoretical water pressure p = ρgh 1 , where ρ is the density of water and g is the acceleration due to gravity.
[0038] Step 3: Fill the bottom section steel shell with water to land it and carry out concrete pouring.
[0039] In this embodiment, after the floating is completed, the position of the bottom section steel shell is adjusted (positioned), and then by quickly filling water into the bottom section steel shell, the self-weight of the bottom section steel shell is increased, so that it quickly sinks until it stably sits on the riverbed; concrete is poured into the bottom section steel shell after it has landed, that is, in each well hole on the plane of the caisson, equipment such as a suction dredger is used to take soil, reducing the end resistance at the bottom of the caisson foundation, so that the self-weight of the caisson foundation is greater than the sum of the side wall friction resistance and the bottom end resistance of the caisson foundation, resulting in downward settlement, simply referred to as sinking.
[0040] In this embodiment, starting from when the bottom section steel shell begins to sink after the floating is completed, it is judged whether the bottom section steel shell has landed; when the monitoring data τ of the earth pressure sensors 5 < ρgh 2 , the bottom section steel shell has not landed, then continue to monitor until the bottom section steel shell lands, where h 2When the bottom steel shell is floated to the position where it will sink, the distance between the earth pressure sensor and the riverbed or seabed; when the monitoring data τ of the earth pressure sensor 5 >ρgh 2 , the bottom steel shell touches down on the bed, and subsequent steps are carried out.
[0041] In this embodiment, according to the monitoring data τ of the earth pressure sensor 5 , calculate the depth h of the water at the position of the bottom steel shell during the sinking process before it touches down on the bed h 1 is the depth of the water corresponding to the theoretical water pressure borne by the earth pressure sensor during the floating process of the bottom steel shell.
[0042] Step Four: Connect the remaining segments of the caisson foundation on-site according to the construction plan and take soil to sink.
[0043] Step Five: Pour the bottom-sealing concrete.
[0044] In this embodiment, pour a certain height of bottom-sealing concrete in the well holes to increase the force-transfer area between the caisson foundation and the soil layer at the bottom of the caisson; then construct the top slab of the caisson foundation, and construct structures such as the bearing platform, tower base or anchor body on this top slab.
[0045] Step Six: After the bottom-sealing concrete coagulates and solidifies, calculate the stress of the concrete inside the cutting edge according to the monitoring data of the stress sensor.
[0046] In this embodiment, establish a finite element calculation model of the caisson foundation according to the actual structural conditions of the caisson foundation, and calculate the theoretical stress τ of the concrete inside the cutting edge at the installation position of the stress sensor 1 , as well as the theoretical stress τ of the cutting-edge steel plate at the installation position of the stress sensor 2 ; obtain the monitoring data τ of the stress sensor 3 ; calculate the actual stress of the concrete inside the cutting edge at the installation position of the stress sensor
[0047] In this embodiment, the caisson foundation includes a well wall, partition walls and ordinary partition walls; the partition walls are arranged inside the well wall and are used to divide the caisson foundation into multiple areas; the ordinary partition walls are arranged inside the well wall and are used to divide the areas separated by the partition walls to form multiple well holes.
[0048] As Figure 2 shown, the monitoring direction of the stress sensor 2 is the extension direction of the cutting edge, that is: when observing the well wall 3 from top to bottom, it is square, and the partition walls 1 and ordinary partition walls 4 divide the inside of the well wall 3 into a grid shape, and each grid is a well hole, and stress sensors 2 are installed on the four sides of the square well wall, and the monitoring direction of the stress sensors on each side is the length direction of the corresponding side; for the stress sensors arranged on the partition walls 1 and ordinary partition walls 4, their monitoring direction is the length direction of the corresponding partition wall.
[0049] In this embodiment, the earth pressure sensors are installed on the inclined surface of the cutting edge; the stress sensors are installed on the top of the cutting edge.
[0050] As Figure 3 shown, earth pressure sensors 5 are installed on the shaft wall 3, the partition wall 1 and the common partition wall 4, and the number of earth pressure sensors on the partition wall 1 is more than that on the common partition wall 4.
[0051] In this embodiment, the cutting edge includes concrete inside and steel plates wrapped outside the concrete. The cutting edge includes a first cutting edge provided at the bottom of the shaft wall, a second cutting edge provided at the bottom of the partition wall, and a third cutting edge provided at the bottom of the common partition wall.
[0052] As Figure 4 shown, the lower end of the first cutting edge is wedge-shaped; as Figure 5 shown, the lower end of the second cutting edge is isosceles trapezoidal; as Figure 6 shown, the lower end of the third cutting edge is cuboid-shaped.
[0053] Embodiment 2:
[0054] This embodiment provides a monitoring construction control device for a caisson foundation, including a processor and a storage medium; the storage medium is used for storing instructions; the processor is used for operating according to the instructions to execute the steps of the method in Embodiment 1.
[0055] Embodiment 3:
[0056] This embodiment provides a computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the steps of the method in Embodiment 1 are implemented.
[0057] Those skilled in the art should understand that the embodiments of the present application can be provided as a method or a computer program product. Therefore, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.
[0058] The present application is described with reference to the flowcharts and / or block diagrams of the methods and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowcharts and / or block diagrams, and the combination of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate for implementing in the process Figure 1one or more processes and / or blocks Figure 1 a device for the functions specified in one or more blocks. These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory produce a manufactured article including an instruction device that implements the processes Figure 1 one or more processes and / or blocks Figure 1 the functions specified in one or more blocks.
[0059] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to produce a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in Figure 1 one or more processes and / or blocks Figure 1 one or more blocks.
[0060] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.
Claims
1. A monitoring construction method for caisson foundation, characterized in that: include: Manufacturing and assembling the bottom section steel shell, installing an earth pressure sensor and a steel structure stress sensor on the blade foot of the bottom section steel shell, setting the actual monitoring value of the stress sensor after installation as the initial value of the stress sensor, subtracting the initial value of the stress sensor from the actual monitoring value of the stress sensor, and outputting the monitoring data of the stress sensor; The bottom section steel shell is floated to the position where it will sink, the theoretical water pressure borne by the earth pressure sensor during the floating process is calculated, the theoretical water pressure is set as the initial value of the earth pressure sensor, the actual monitoring value of the earth pressure sensor is subtracted from the initial value of the earth pressure sensor, and the monitoring data of the earth pressure sensor is output; The bottom section steel shell is water-filled and then concrete is poured; The remaining sections of the caisson foundation shall be raised on site according to the construction plan, and soil shall be taken and sunk; Pour the bottom concrete.
2. A monitoring construction method for caisson foundation according to claim 1, characterized in that: The method further includes calculating the stress of the concrete in the blade foot according to the monitoring data of the stress sensor after the bottom seal concrete solidifies: According to the actual structural condition of the caisson foundation, a finite element calculation model of the caisson foundation is established, and the theoretical stress τ1 of the concrete in the blade foot at the installation position of the stress sensor and the theoretical stress τ2 of the blade foot steel plate at the installation position of the stress sensor are calculated; Obtain monitoring data τ3 of the stress sensor; Calculate the actual stress in the concrete at the blade foot where the stress sensor is installed 3. The monitoring construction method of a caisson foundation according to claim 1 is characterized in that: During the floating process, the calculation method of the theoretical water pressure on the earth pressure sensor includes: Measure the depth h1 of water at the location of the soil pressure sensor; Calculate the theoretical water pressure p=ρgh1, where ρ is the density of water and g is the acceleration due to gravity.
4. The monitoring construction method of a caisson foundation according to claim 1 is characterized in that: The method further comprises determining whether the bottom section steel shell is implanted during the process of water injection and sinking of the bottom section steel shell; When the monitoring data of the earth pressure sensor τ5<ρgh2, the bottom section steel shell is not grounded, where h2 is the distance between the earth pressure sensor and the riverbed or seabed when the bottom section steel shell is floated to the position where it will sink; When the monitoring data of the soil pressure sensor τ5>ρgh2, the bottom section steel shell is planted.
5. The monitoring construction method of a caisson foundation according to claim 1, characterized in that: The method also includes calculating the water depth at the location of the bottom section steel shell according to the monitoring data τ5 of the soil pressure sensor during the water injection and sinking process of the bottom section steel shell. h1 is the water depth corresponding to the theoretical water pressure borne by the earth pressure sensor during the floating process of the bottom section steel shell.
6. The monitoring construction method of caisson foundation according to claim 1, characterized in that: The monitoring direction of the stress sensor is the extending direction of the blade foot.
7. The monitoring construction method of caisson foundation according to claim 1 is characterized in that: The caisson foundation comprises a well wall (3), a partition wall (1) and a common partition wall (4); Partition walls are set inside the shaft wall to separate the caisson foundation into multiple areas; The common partition wall is arranged in the well wall and is used to separate the areas separated by the partition walls to form a plurality of well holes.
8. The monitoring construction method of caisson foundation according to claim 7 is characterized in that: The blade feet include a first blade foot arranged at the bottom of the well wall, a second blade foot arranged at the bottom of the partition wall, and a third blade foot arranged at the bottom of the common partition wall.
9. A monitoring construction control device for caisson foundation, characterized in that: The method comprises a processor and a storage medium; the storage medium is used to store instructions; the processor is used to operate according to the instructions to execute the steps of the method according to any one of claims 1 to 8.
10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 8 are implemented.