Installation posture monitoring and control method for rigid joint of diaphragm wall in deep water environment

Abstract

The application discloses a kind of deep-water environment under the installation posture monitoring and control method of diaphragm wall rigid joint, rigid joint perpendicularity control method, comprising the following steps: S1, a measuring point is arranged in the middle of rigid joint before approach, biaxial inclinometer is installed at measuring point, and rigid joint processing error is measured;S2, two groups of corbels are symmetrically provided on the opposite two faces of steel box structure, leveling device is arranged on both sides of slot hole before rigid joint hoisting, and rigid joint is lowered to leveling device;S3, the bottom section steel box is leveled by biaxial inclinometer data, the angle of adjustment should be subtracted from the deflection angle caused by processing error, the elevation coordinate change corresponding to the angle change of rigid joint is calculated, and the perpendicularity of rigid joint is made to reach the requirement by adjusting the elevation of rigid joint.The application realizes real-time dynamic high-precision adjustment of rigid joint posture, improves the work efficiency and precision of rigid joint installation, and greatly improves the safety of rigid joint installation.

Description

Technical Field

[0001] The present invention relates to the field of foundation pit construction methods, and more specifically, to a method for monitoring and controlling the installation posture of a rigid joint of a ground-connected wall in a deep-water environment. Background Art

[0002] As a powerful and effective support method, underground continuous walls are increasingly used in the design of deep foundation pit retaining structures. The commonly used construction method is the overall construction of unit trench segments, with joints used to connect the unit trench segments to form a continuous underground reinforced concrete wall. Underground continuous wall joints are divided into non-rigid joints (circular lock pipe joints, hinged joints, milling joints) or rigid joints (H-shaped steel joints, cross steel plate joints, V-shaped steel plate joints) and rigid joints. Non-rigid joints do not transmit internal forces in the wall and have poor integrity. Rigid joints are widely used in ground-connected wall construction due to their advantages such as easy on-site processing, high overall rigidity, and good water-stopping effect.

[0003] When installing rigid joints, their verticality is directly related to the smooth lowering of the steel cage and the final verticality of the underground continuous wall. Therefore, it is a key part of the construction. Currently, rigid joints are mostly installed by hoisting and lowering. After lowering into place, the verticality of the rigid joints is tested by ultrasonic testing. When the verticality does not meet the requirements, the rigid joints need to be hoisted and adjusted for verticality before being lowered again. This method has low construction efficiency and high safety risks, and the accuracy of ultrasonic testing is greatly affected by the manufacturing accuracy of the steel structure. Therefore, it is necessary to study a new monitoring and control method to improve the efficiency and accuracy of rigid joint installation. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for monitoring and controlling the installation posture of rigid joints of ground-connected walls in a deep-water environment, which realizes real-time dynamic high-precision adjustment of the rigid joint posture, improves the work efficiency and accuracy of the rigid joint installation, and greatly improves the safety of the rigid joint installation.

[0005] The technical solution adopted by the present invention to solve this technical problem is: a method for monitoring and controlling the installation posture of the rigid joint of the ground-connected wall in a deep-water environment, and a method for controlling the verticality of the rigid joint, comprising the following steps:

[0006] S1. Before the rigid joint is brought into the site, a measuring point is arranged in the middle of it. A dual-axis inclinometer is installed at the measuring point to measure the machining error of the rigid joint and determine: the vertical axis deviation of the rigid joint. Based on this deviation, the initial verticality θ of the rigid joint is obtained. 0x and θ 0y , where θ 0x is the initial verticality of the rigid joint in the X-axis direction, θ 0y is the initial verticality of the rigid joint in the Y-axis direction;

[0007] The S2 rigid joint is an integral or multi-section steel box structure, and two sets of brackets are symmetrically arranged on the two opposite sides of the integral steel box structure / each section of the steel box structure. Before the rigid joint is hoisted, leveling devices are arranged on both sides of the slot hole, and the rigid joint is hoisted and lowered onto the leveling devices;

[0008] S3. Level the bottom steel box using the data from the dual-axis inclinometer. The angle of adjustment should be reduced by the deflection caused by the processing error. The elevation coordinate change corresponding to the rigid joint angle change is determined according to formula (1-4). The verticality of the rigid joint is adjusted to meet the requirements.

[0009] ΔZ1=Lx*sin(Δθ x ) (Formula 1)

[0010] ΔZ2=Ly*sin(Δθ y ) (Formula 2)

[0011] Δθ x =θ 1x -θ 0x (Formula 3)

[0012] Δθ y =θ 1y -θ 0y (Formula 4)

[0013] △Z1 is the elevation coordinate change value of the rigid joint in the X-axis direction, △Z2 is the elevation coordinate change value of the rigid joint in the Y-axis direction, Lx is the length of the rigid joint in the X-axis direction, Ly is the length of the rigid joint in the Y-axis direction, θ 1x is the inclination data of the X-axis direction detected by the dual-axis inclinometer, θ 0x is the initial verticality of the rigid joint in the X-axis direction, θ 1y is the inclination data of the Y-axis direction detected by the dual-axis inclinometer, θ 0y is the initial verticality of the rigid joint in the Y-axis direction.

[0014] Preferably, the step S2 specifically includes:

[0015] S21. The rigid joint is a one-piece or multi-section steel box structure, and two sets of brackets are symmetrically arranged on two opposite sides of each section of the steel box structure / an integral steel box structure. Before the rigid joint is hoisted, a leveling device is arranged on both sides of the slot hole. The leveling device comprises four sets of three-way jacks. First, the leveling device is roughly adjusted according to the theoretical position so that the lifting position of the three-way jacks coincides with the theoretical center of the bracket corresponding to the steel box structure;

[0016] S22. When the steel box structure bracket is lowered to a certain distance above the jack, the three-way jack uses the horizontal jack to fine-tune the plane position again so that it is opposite to the center of the bracket. Then lower the steel box bracket to contact the vertical jack of the three-way jack, lift it up through the vertical jack, and control the jack oil pressure to ensure that the jack is evenly stressed.

[0017] Preferably, when the rigid joint is a multi-section steel box structure, after the bottom section steel box structure completes steps S2 and S3, the following steps are further included:

[0018] S4. After the bottom steel box structure is leveled, the middle steel box is hoisted. The middle steel box and the bottom steel box are connected by matching parts. After successful connection, they are connected by welding. After welding is completed, the middle steel box is leveled in the same order as the bottom steel box.

[0019] S5. Similarly, complete the lifting and leveling of the steel boxes of the remaining sections.

[0020] Preferably, after the concrete capping of the rigid joint is poured, if the posture of the rigid joint in a deep-water environment needs to be monitored, at least four biaxial inclinometers are arranged in the height direction of the steel box structure of each segment before the rigid joint is hoisted and installed. The underwater lateral displacement f(x) of the rigid joint is obtained by using the biaxial inclinometers and formula 5).

[0021] f(x)=ax 4 +bx 3 +cx 2 +dx+e (Equation 5)

[0022] x is the installation height of the dual-axis inclinometer, and c, b, c, d, and e are constant values.

[0023] Preferably, the dual-axis inclinometer is connected to a data acquisition and transmission unit.

[0024] The present invention includes at least the following beneficial effects: after adopting the installation posture monitoring and control method of the ground-connected wall rigid joint in a deep-water environment of the present invention, real-time dynamic high-precision adjustment of the rigid joint posture is achieved, the work efficiency and accuracy of the rigid joint installation are improved, and the safety of the rigid joint installation is greatly improved.

[0025] Other advantages, objectives and features of the present invention will be reflected in part from the following description and will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a diagram of the three-segment steel box structure of the present invention;

[0027] Figure 2 yes Figure 1 Section 1-1;

[0028] Figure 3 It is the Lx and Ly marking diagram of the steel box structure section;

[0029] Figure 4 It is a schematic diagram of 12 (Q1 to Q12) dual-axis inclinometers arranged as measuring points in a three-segment steel box structure;

[0030] Figure 5 It is a three-dimensional schematic diagram of the steel box structure and the leveling device;

[0031] Figure 6 It is a flow chart for the installation and leveling of rigid joints.

[0032] Description of reference numerals: 1 rigid joint, 2 leveling device. DETAILED DESCRIPTION

[0033] The present invention is described in detail and completely below with reference to the accompanying drawings. Those skilled in the art will be able to implement the present invention based on this description. Before describing the present invention with reference to the accompanying drawings, it should be noted that the technical solutions and technical features provided in various parts of the present invention, including those described below, may be combined with each other unless they conflict.

[0034] In addition, the embodiments of the present invention described below are generally only part of the embodiments of the present invention, rather than all of the embodiments. Therefore, based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making any creative efforts should fall within the scope of protection of the present invention.

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The specific implementation process is as follows:

[0036] like Figures 1-2 As shown in FIG6 , the present invention provides a method for monitoring and controlling the installation posture of a ground-connected wall rigid joint 1 in a deep-water environment, and a method for controlling the verticality of the rigid joint 1, comprising the following steps:

[0037] S1. During the lowering process, the steel box is always in a free motion state, so the steel box can be regarded as a rigid body. Similarly, before the bottom concrete of the rigid joint 1 is poured, the change in the angle of the rigid joint 1 can be regarded as the movement of a rigid body. Therefore, each section of the rigid joint 1 only needs to have one measuring point in the middle, and an inclinometer is arranged at the measuring point to monitor the posture of the rigid joint 1 and obtain the angle change of the rigid joint 1. Before the rigid joint 1 enters the site, a measuring point is arranged in the middle of it, and a dual-axis inclinometer is installed at the measuring point to measure the processing error of the rigid joint 1. The main determination is: the vertical axis deviation of the rigid joint 1, and the initial verticality θ of the rigid joint 1 is obtained based on the deviation. 0x and θ0y , where θ 0x is the initial verticality of the rigid joint 1 in the X-axis direction, θ 0y is the initial verticality of rigid joint 1 in the Y-axis direction.

[0038] Sensor selection

[0039] A dual-axis inclinometer is used to monitor the posture of the steel box. The sensor selection should be based on the test requirements of the steel box verticality and the waterproof and mud-proof requirements of the sensor in deep water environment. When the verticality requirement of the steel box is above 1 / 500, the sensor can use the indicators in Table 1 as a reference for selection.

[0040] Table 1 Reference parameters for dual-axis inclinometer selection

[0041] Serial number parameter Corresponding indicators 1 Range Dual axis (X / Y axis) ±10° 2 Accuracy 0.003°(RMS) 3 Resolution 0.0005° 4 Long-term stability 0.01° 3 Protection level IP68 4 Cables Custom waterproofing

[0042] S2 Figure 1 As shown, the rigid joint 1 has a total length of 83.5m and is divided into three sections. Two sets of brackets are symmetrically arranged on the two opposite sides of each steel box structure. Before the rigid joint 1 is hoisted, a leveling device 2 is arranged on both sides of the slot hole, and the rigid joint 1 is hoisted and lowered onto the leveling device 2;

[0043] S3. Level the bottom steel box using the data from the dual-axis inclinometer. The angle of adjustment should be reduced by the deflection caused by the processing error. The elevation coordinate change corresponding to the angle change of the rigid joint 1 is determined according to formula (1-4). The verticality of the rigid joint 1 is adjusted to meet the requirements.

[0044] ΔZ1=Lx*sin(Δθ x ) (Formula 1)

[0045] ΔZ2=Ly*sin(Δθ y ) (Formula 2)

[0046] Δθ x =θ 1x -θ0 x (Formula 3)

[0047] Δθ y =θ 1y -θ 0y (Formula 4)

[0048] △Z1 is the elevation coordinate change value of rigid joint 1 in the X-axis direction, and △Z2 is the elevation coordinate change value of rigid joint 1 in the Y-axis direction, such as Figure 3 As shown, Lx is the length of the rigid joint 1 in the X-axis direction, Ly is the length of the rigid joint 1 in the Y-axis direction, θ 1x is the inclination data of the X-axis direction detected by the dual-axis inclinometer, θ 0xis the initial verticality of the rigid joint 1 in the X-axis direction, θ 1y is the inclination data of the Y-axis direction detected by the dual-axis inclinometer, θ 0y is the initial verticality of rigid joint 1 in the Y-axis direction.

[0049] This technical solution may further include the following technical details to better achieve the technical effect: Step S2 specifically includes:

[0050] S21, such as Figure 5 As shown, two sets of brackets are symmetrically arranged on two opposite sides of each steel box structure, totaling four brackets. When the steel box joint is a whole, it is hoisted at one time. When the steel box joint is multi-section, it is hoisted in batches. In this embodiment, the rigid joint 1 used in deep water environment is divided into three sections, and the length of each section is 27 to 30 meters. The four brackets used for leveling are relatively created with height differences. The relative height difference of the leveling device 2 is adjusted to ensure that the force of the leveling device 2 is balanced. Before the rigid joint 1 is hoisted, the leveling device 2 is arranged on both sides of the slot hole. The leveling device 2 is four sets of three-way jacks. First, the leveling device 2 is roughly adjusted according to the theoretical position so that the lifting position of the three-way jack coincides with the theoretical center of the bracket corresponding to the steel box structure.

[0051] S22. Since the steel box structure will twist during the lowering process, when the steel box structure bracket is lowered to a certain distance above the jack, about 5 cm in this embodiment, the three-way jack uses the horizontal jack to fine-tune the plane position again so that it is opposite to the center of the bracket, and then lowers the steel box bracket to contact the vertical jack of the three-way jack, and lifts it with the vertical jack, controlling the jack oil pressure to make the jack as evenly stressed as possible.

[0052] This technical solution may also include the following technical details to better achieve the technical effect: when the rigid joint 1 is a multi-section steel box structure, after the bottom section steel box structure completes steps S2 and S3, it also includes the following steps:

[0053] S4. After the bottom section steel box structure is leveled, start hoisting the middle section steel box. The middle section steel box and the bottom section steel box are butted together using matching parts. After successful butt connection, welds are used to connect them. When welding, attention should be paid to the welding sequence to ensure welding symmetry and to suppress the weld shrinkage of each weld. After welding is completed, the middle section steel box is leveled in the same order as the bottom section steel box.

[0054] S5. Similarly, complete the hoisting and leveling of the remaining steel box sections. In this embodiment, the rigid joint 1 is divided into three sections. The hoisting and lowering of the top steel box section is similar to that of the middle steel box sections. After the top steel box section is lowered into place, the inclination angles of the three sections may be inconsistent. Leveling the top section should be based on the average of the three inclination angles.

[0055] This technical solution can also include the following technical details to better achieve the technical effect: After the bottom concrete of the rigid joint 1 is poured, when it is necessary to monitor the posture of the rigid joint 1 in a deep water environment, before the rigid joint 1 is hoisted and installed, four biaxial inclinometers are arranged in the height direction of the steel box structure of each segment. The rigid joint 1 has three steel box structures, such as Figure 4 As shown, a total of 12 dual-axis inclinometers Q1, Q2, ..., Q12 are set up, and the underwater lateral displacement f(x) of the rigid joint 1 is obtained by the dual-axis inclinometer and formula 5);

[0056] f(x)=ax 4 +bx 3 +cx 2 +dx+e (Equation 5)

[0057] x is the installation height of the dual-axis inclinometer, and c, b, c, d, and e are constant values.

[0058] In the above embodiment, after the bottom concrete of the steel box is poured, the steel box can be used as a column with a fixed bottom and hinged top. Its lateral displacement equation can be expressed as a fourth-order polynomial, that is, f(x)=ax 4 +bx 3 +cx 2 +dx+e; f(x) displacement change lateral displacement curve corresponding to the inclination angle θ=f′(x)=4ax 3 +3bx 2 +2cx+d, through the inclinometer data θ at the corresponding position of each section and the installation height x of the dual-axis inclinometer, the coefficients a, b, c, and d corresponding to the side displacement equation can be calculated. Among them, considering the bottom consolidation, f(0)=0, that is, e=0; finally, the side displacement equation f(x) of the steel box is obtained.

[0059] Considering that the steel box is divided into three sections, four inclinometers are arranged along the height direction of each section of the steel box. The above formula can be used to calculate the side displacement of each section of the steel box. Figure 4 .

[0060] This technical solution may also include the following technical details to further achieve the technical effect: the dual-axis inclinometer is connected to a data acquisition and transmission unit, using a 485 output. The inclinometer data is transmitted to a cloud server via a 4G DTU, automatically and continuously collecting the steel box's posture in real time. The data sampling frequency is 0.1Hz, and 3-σ accuracy is used to preprocess the data to remove gross errors. The preprocessed data is then post-processed using wavelet threshold denoising, and the processed data is used as the monitoring data.

[0061] After the bottom section steel box structure is installed, the middle section steel box structure is hoisted over. The data acquisition and transmission unit needs to be removed to facilitate the docking and welding of the middle section steel box structure and the bottom section steel box structure. After completing the positioning and connection of the middle section steel box structure and the bottom section steel box structure, the dual-axis inclinometer is connected to the data acquisition and transmission unit again through cables.

[0062] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and embodiments shown and described herein.

Claims

1. A method for monitoring and controlling the installation posture of a rigid joint of a ground-connected wall in a deep-water environment, characterized in that: The method for controlling the verticality of a rigid joint comprises the following steps: S1. Before the rigid joint is brought into the site, a measuring point is arranged in the middle of it. A dual-axis inclinometer is installed at the measuring point to measure the processing error of the rigid joint and determine: the vertical axis deviation of the rigid joint. Based on this deviation, the initial verticality of the rigid joint is obtained. and ,in, is the initial verticality of the rigid joint in the X-axis direction, is the initial verticality of the rigid joint in the Y-axis direction; The S2 rigid joint is a whole, and two sets of brackets are symmetrically arranged on two opposite sides of the whole steel box structure. Before the rigid joint is hoisted, leveling devices are arranged on both sides of the slot hole, and the rigid joint is hoisted and lowered onto the leveling devices; S3. Level the bottom steel box using the data from the dual-axis inclinometer. The angle of adjustment should be reduced by the deflection caused by the machining error. The change in elevation coordinates corresponding to the change in the rigid joint angle is determined according to formula (1-4). The verticality of the rigid joint is then adjusted to meet the requirements. △Z1 is the elevation coordinate change value of the rigid joint in the X-axis direction, △Z2 is the elevation coordinate change value of the rigid joint in the Y-axis direction, Lx is the length of the rigid joint in the X-axis direction, Ly is the length of the rigid joint in the Y-axis direction, The inclination data of the X-axis direction detected by the dual-axis inclinometer, is the initial verticality of the rigid joint in the X-axis direction, It is the inclination data of the Y-axis direction detected by the dual-axis inclinometer. is the initial verticality of the rigid joint in the Y-axis direction.

2. The method for monitoring and controlling the installation posture of the rigid joint of the ground-connected wall in a deep-water environment according to claim 1, characterized in that: The step S2 specifically includes: S21. The rigid joint is an integral unit, and two sets of brackets are symmetrically arranged on two opposite sides of the integral steel box structure. Before the rigid joint is hoisted, a leveling device is arranged on both sides of the slot. The leveling device comprises four sets of three-way jacks. First, the leveling device is roughly adjusted according to the theoretical position so that the lifting position of the three-way jacks coincides with the theoretical center of the bracket corresponding to the steel box structure. S22. When the steel box structure bracket is lowered to a certain distance above the jack, the three-way jack uses the horizontal jack to fine-tune the plane position again so that it is opposite to the center of the bracket. Then lower the steel box bracket to contact the vertical jack of the three-way jack, lift it up through the vertical jack, and control the jack oil pressure to ensure that the jack is evenly stressed.

3. The method for monitoring and controlling the installation posture of the rigid joint of the ground-connected wall in a deep-water environment according to claim 1, characterized in that: The dual-axis inclinometer is connected to a data acquisition and transmission unit.

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