Comprehensive monitoring system for large diameter thin-walled steel cylinders on island walls

Abstract

The present invention discloses a comprehensive monitoring system for large-diameter thin-walled steel cylinders on island walls, including: a multi-stage automatic monitoring system for cylinder deformation, a manual monitoring system for cylinder deformation, a cylinder wall stress monitoring system, and a soil pressure and water pressure monitoring system; the multi-stage automatic monitoring system for cylinder deformation, the manual monitoring system for cylinder deformation, and the cylinder wall stress monitoring system are arranged on the inner wall of the steel cylinder, and the soil pressure and water pressure monitoring system is arranged on the outer wall of the steel cylinder. The present invention can comprehensively obtain the stress and deformation information of the steel cylinders of various parts of the island wall, analyze the stress and deformation development of the steel cylinder structure under various construction procedures of the artificial island, thereby controlling the construction progress, optimizing the construction process, and ensuring the safety and stability of the island wall structure.

Description

Technical Field

[0001] The invention relates to the technical field of monitoring methods, and in particular to a comprehensive monitoring system for island wall large-diameter thin-walled steel cylinders. Background Art

[0002] Large diameter thin-walled steel cylinders, with a height of 35 to 40m, a diameter of 25 to 35m, and a wall thickness of about 20mm, are used as island wall structures for rapid island formation technology in the sea and have been successfully applied to the artificial islands of the Hong Kong-Zhuhai-Macao Bridge and the Shenzhen-Zhongshan Channel. The large diameter thin-walled steel cylinder is located on the island wall, with the outer side facing the sea and the inner side being the island construction surface. The two sides are connected to other steel cylinders through auxiliary grid arc plates, and the stress conditions of the cylinder body are quite different. In order to ensure the safety and stability of the island wall structure during the island formation process, it is necessary to monitor the thin-walled steel cylinder structure. At present, there is still a blank in the field of deformation monitoring of steel cylinders. Summary of the invention

[0003] In order to fully grasp the stress and deformation state of large-diameter thin-walled steel cylinders and ensure the safety and stability of the island wall structure, the present invention provides an island wall large-diameter thin-walled steel cylinder comprehensive monitoring system to fully obtain the stress and deformation information of each part of the steel cylinder.

[0004] The present invention is achieved through the following technical solutions:

[0005] A comprehensive monitoring system for island wall large diameter thin wall steel cylinder, comprising:

[0006] A multi-stage automatic monitoring system for cylinder deformation, a manual monitoring system for cylinder deformation, a cylinder wall stress monitoring system, and a soil pressure and water pressure monitoring system; the multi-stage automatic monitoring system for cylinder deformation, the manual monitoring system for cylinder deformation, and the cylinder wall stress monitoring system are arranged on the inner wall of the steel cylinder, and the soil pressure and water pressure monitoring system are arranged on the outer wall of the steel cylinder;

[0007] The multi-stage automatic monitoring system for cylinder deformation adopts an inclinometer sensor. Sensor fixing components are arranged at intervals along the axial direction of the steel cylinder on the inner wall of the steel cylinder, and an inclinometer sensor is installed in each sensor fixing component; the cable of the inclinometer sensor passes through the through hole on the transverse rib on the inner wall of the steel cylinder and is vertically led upward to the cylinder top and placed in an instrument box; the inclinometer sensor and its cable are protected by a protective component, which adopts a channel steel, the bottom of the channel steel is closed with a slanted foot, angle steels are welded on both sides of the channel steel, and the angle steels are welded to the cylinder wall of the steel cylinder, and the channel steels are arranged along the axial installation track of the sensor fixing component, so that all sensor fixing components and the inclinometer sensor cables led out of the sensor fixing component are enclosed therein;

[0008] The manual monitoring system for cylinder deformation adopts an inclinometer tube. A through hole for installing the inclinometer tube is opened on the transverse rib on the inner wall of the steel cylinder along the axial direction of the steel cylinder. The inclinometer tube passes through the through hole installed on the transverse rib. The bottom end of the inclinometer tube reaches the upper edge of the lower reinforcing plate at the bottom of the steel cylinder, and the top end of the inclinometer tube reaches the lower edge of the upper reinforcing plate at the top of the steel cylinder. A pipe shoe is installed at the bottom end of the inclinometer tube, and the pipe shoe is welded to the cylinder wall of the steel cylinder. From the top of the pipe shoe, protective tubes and studs are alternately welded on the inner wall of the steel cylinder at intervals upward along the inclinometer tube; the inclinometer tube is spliced ​​by multiple sections of single inclinometer tubes through pipe clamps, the protective tube is sleeved on the pipe clamp connection of the inclinometer tube, a buckle is installed on the stud, and the buckle is buckled to the inclinometer tube through a nut, and a rubber pad is padded at the contact between the buckle and the inclinometer tube;

[0009] The cylinder wall stress monitoring system adopts a static strain gauge, and at least one annular strain gauge and one vertical strain gauge are arranged on the cylinder wall above the sinking surface of the steel cylinder, and at least one annular strain gauge and multiple vertical strain gauges are arranged on the cylinder wall below the sinking surface. The multiple vertical strain gauges are arranged at equal intervals, and the annular strain gauge is arranged on the side of the vertical strain gauge above the transverse rib; the strain gauge is installed on the strain gauge base, and a protection box is installed for protection, and the protection box is filled with foam glue; the cable of the strain gauge is straightened and led upward to the top of the cylinder and placed in the instrument box; the strain gauge cable is protected by channel steel as a protective component, and angle steels are welded on both sides of the channel steel, and the angle steel is welded to the cylinder wall of the steel cylinder. Correspondingly, corresponding through holes are opened on the transverse ribs on the inner wall of the steel cylinder, so that the strain gauge cable can pass through the transverse ribs and be led upward;

[0010] The soil pressure and water pressure monitoring system adopts a soil pressure box and a piezometer, which are installed on the outer wall area below the sinking surface of the steel cylinder. The cables of the soil pressure box and the piezometer are protected by channel steel, led vertically upward along the channel steel to the top of the cylinder, and placed in an instrument box.

[0011] In the above technical solution, the sensor fixing component is composed of a steel pipe and two angle steels welded on both sides of the steel pipe. The bottom end of the steel pipe is closed by an iron sheet and a through hole is opened in the center of the iron sheet. The inner diameter of the steel pipe is 5 mm larger than the outer diameter of the inclinometer sensor. The diameter of the through hole in the center of the iron sheet is larger than the diameter of the fixing nut at the bottom of the inclinometer sensor. During installation, the edge of the angle steel is welded to the wall of the steel cylinder.

[0012] In the above technical solution, the length of a single channel steel is equal to the spacing between the transverse ribs on the inner wall of the steel cylinder, and the ends of the channel steel are connected to the transverse ribs, opposite to the openings on the transverse ribs, so as to fully protect the cables and prevent them from being exposed.

[0013] In the above technical solution, the width of the channel steel is preferably 0.3-0.5m.

[0014] In the above technical solution, the diameter of the openings on the transverse ribs is preferably 5-8 cm.

[0015] In the above technical solution, the standard length of a single inclinometer tube is 1-3m, with a cross groove embedded inside. When splicing, the end of the inclinometer tube is pre-applied with glue at the pipe clamp, and then inserted into the pipe clamp for docking, and then wrapped with waterproof tape after docking.

[0016] In the above technical solution, the buckle is of "Ω" shape, formed by bending a metal sheet, wherein the middle part is a bent section, and the bent section has side wings on both sides, and each side wing is provided with an opening.

[0017] In the above technical solution, one end of the stud is welded to the inner wall of the steel cylinder for matching installation with the opening on the side wing of the "Ω"-shaped buckle.

[0018] In the above technical solution, the protection tube is formed by welding a steel tube and an angle steel. Angle steels are welded on both sides of the steel tube to form two wings. The bottom surface of the angle steel is flush with the bottom surface of the steel tube. The protection tube is used to protect the pipe clamp connection of the inclinometer tube.

[0019] In the above technical solution, the pipe boot is composed of a steel pipe and an angle steel. Angle steels are welded on both sides of the steel pipe to form two wings. The bottom surface of the angle steel is flush with the bottom surface of the steel pipe. The bottom end of the steel pipe is wedge-shaped and has a bottom cover to protect the bottom of the inclinometer tube and prevent the inclinometer tube from being split and damaged when the steel cylinder is vibrated and sunk.

[0020] In the above technical scheme, the channel steel of the soil pressure and water pressure monitoring system is arranged along the axial direction of the steel cylinder, and each interval of 3-6m along the longitudinal direction of the channel steel is a monitoring height surface, and two monitoring points are arranged horizontally on each monitoring height surface. The two monitoring points of each monitoring height surface are arranged symmetrically with the channel steel as the symmetry axis. An earth pressure box and a piezometer are arranged at each monitoring point, and through holes are arranged at corresponding positions on both sides of the channel steel to allow the earth pressure box and a piezometer cable to enter the channel steel.

[0021] In the above technical solution, the earth pressure box and the piezometer are installed on the base, fixed to the outer wall of the steel cylinder through the base, sponge rubber is used for buffering at the hard connection, and the gap between the earth pressure box and the piezometer and the cable joint are wrapped with viscoelastic body.

[0022] The advantages and beneficial effects of the present invention are:

[0023] The island wall large diameter thin wall steel cylinder comprehensive monitoring system of the present invention has a multi-stage automatic monitoring system for cylinder deformation, a manual monitoring system for cylinder deformation and a cylinder wall stress monitoring system arranged on the inner wall of the steel cylinder, and an earth pressure and water pressure monitoring system arranged on the outer wall of the steel cylinder. By adopting different monitoring means, the stress deformation information of the steel cylinders of each part of the island wall can be fully obtained to ensure the safety and stability of the island wall structure. The steel cylinder monitoring systems have stable structure, simple manufacture and installation, and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a multi-stage automatic monitoring system for barrel deformation.

[0025] Figure 2 It is a schematic diagram of the top view structure of the sensor fixing component in the multi-stage automatic monitoring system for barrel deformation.

[0026] Figure 3 It is a side view structural diagram of a sensor fixing component in a multi-stage automatic monitoring system for barrel deformation.

[0027] Figure 4 It is a schematic diagram of the installation structure of the manual monitoring system for barrel deformation.

[0028] Figure 5 yes Figure 4 A partial enlarged structural diagram of the middle protective tube.

[0029] Figure 6 yes Figure 4 A partial enlarged structural diagram of the middle buckle.

[0030] Figure 7.1 yes Figure 4 Front view of the middle buckle.

[0031] Figure 7.2 yes Figure 4 Top view of the middle buckle.

[0032] Figure 8.1 yes Figure 4 Front view of the middle protective tube.

[0033] Figure 8.2 yes Figure 4 Top view of the protective tube.

[0034] Figure 9.1 yes Figure 4 Side view of the mid-tube boot.

[0035] Figure 9.2 yes Figure 4 A top view of the mid-tube boot.

[0036] Fig.10 It is a schematic diagram of the installation structure of the cylinder wall stress monitoring system.

[0037] Fig.11 It is a schematic diagram of the installation structure of the earth pressure and water pressure monitoring system.

[0038] For ordinary technicians in this field, other relevant drawings can be obtained based on the above drawings without any creative work. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is further described below in conjunction with specific embodiments.

[0040] A comprehensive monitoring system for island wall large diameter thin wall steel cylinders comprises: a multi-stage automatic monitoring system for cylinder deformation, a manual monitoring system for cylinder deformation, a cylinder wall stress monitoring system, and a soil pressure and water pressure monitoring system.

[0041] The multi-stage automatic monitoring system for cylinder deformation, the manual monitoring system for cylinder deformation and the cylinder wall stress monitoring system are arranged on the inner wall of the steel cylinder, and the soil pressure and water pressure monitoring system are arranged on the outer wall of the steel cylinder.

[0042] The large-diameter thin-walled steel cylinder has a wall thickness of 20mm, and the inner wall of the cylinder is arranged with reinforcing transverse ribs and longitudinal ribs. The above-mentioned monitoring systems are installed during the prefabrication of the steel cylinder in the factory. Before installation, a total station is used to lay out and position the sea side and the island side of the steel cylinder, with a positioning deviation of ±20cm.

[0043] See attached Figure 1-3 The multi-stage automatic monitoring system for cylinder deformation adopts an inclinometer sensor. A sensor fixing component M1 is arranged on the inner wall of the steel cylinder along the axial direction of the steel cylinder every 3m. The inclinometer sensor is installed in the sensor fixing component. The "+" direction of the inclinometer sensor faces the inside of the cylinder, and the inclinometer sensor reading is made as close to 0 as possible. The bottom of the steel cylinder is taken as the base point, and the deformation of the cylinder is calculated in an iterative manner of inclination from bottom to top.

[0044] The sensor fixing component M1 is composed of a steel pipe M1-1 and two angle steels M1-2 welded on both sides of the steel pipe. The bottom end of the steel pipe is closed by an iron sheet M1-3 and a through hole M1-31 is opened in the center of the iron sheet. The inner diameter of the steel pipe is 5 mm larger than the outer diameter of the inclinometer sensor. The diameter of the through hole M1-31 in the center of the iron sheet is 2 mm larger than the diameter of the fixing nut at the bottom of the inclinometer sensor. During installation, the edge of the angle steel is welded to the wall of the steel cylinder.

[0045] After the inclinometer sensor is installed, lead the cable of the inclinometer sensor vertically upward to the top of the cylinder and place it in the instrument box M2. After the on-site vibration sinker is placed in place, connect it to the automatic data collection and transmission equipment to realize automatic data collection.

[0046] The inclinometer sensor and its cable are protected by a protective component M3. The protective component M3 is made of channel steel. The bottom of the channel steel is closed with a slanted foot M3-1. Angle steels M3-2 are welded on both sides of the channel steel. The channel steel is welded to the wall of the steel cylinder through the angle steels M3-2. The protective component M3 is arranged along the axial installation trajectory of the sensor fixing component M1, and all sensor fixing components M1 and the inclinometer sensor cables led out from the sensor fixing component are enclosed therein for good protection. Since transverse ribs are arranged on the inner wall of the steel cylinder, a total station is used to accurately locate and mark lines on the cylinder wall before installation. The marking lines are parallel to the axis of the steel cylinder, that is, the marking lines are arranged along the axial direction of the steel cylinder. The transverse ribs on the cylinder wall are opened along the marking lines, so that the transverse ribs in the cylinder wall are connected up and down so that the cable of the inclinometer sensor can pass through the transverse ribs and be led out upward. Furthermore, the length of the channel steel is equal to the spacing between the transverse ribs, that is, both ends of the channel steel must be connected to the transverse ribs, so as to fully protect the cables and prevent them from being exposed.

[0047] See attached Figure 4-9.2 The manual monitoring system for cylinder deformation adopts an ABS inclinometer tube 1, and a hole is opened on the transverse rib of the cylinder wall along the axial marking line, so that the transverse rib in the cylinder wall is connected up and down for installing the inclinometer tube 1; the inclinometer tube is penetrated and installed in the opening on the transverse rib, and the inclinometer tube is spliced ​​by a plurality of sections of inclinometer tube single tubes through a pipe clamp 6, and the bottom end of the inclinometer tube is connected to the upper edge of the lower reinforcing plate A-3 at the bottom of the steel cylinder, and the top end of the inclinometer tube is connected to the lower edge of the upper reinforcing plate A-2 at the top of the steel cylinder. A pipe shoe 5 is installed at the bottom end of the inclinometer tube, and the pipe shoe is welded to the cylinder wall of the steel cylinder. From the top of the pipe shoe, a protective tube 4 and a stud 3 are alternately welded on the inner wall of the steel cylinder at intervals along the inclinometer tube upward. The protective tube 4 is sleeved on the pipe clamp connection of the inclinometer tube, a buckle 2 is installed on the stud 3, and the buckle is buckled with the inclinometer tube 1 through a nut, and a rubber pad is padded at the contact between the buckle and the inclinometer tube.

[0048] The standard length of the ABS inclinometer tube is 2m, with a cross groove embedded inside. Each ABS inclinometer tube is connected by a pipe clamp 6 (see attached Figure 5 ), the bottom inclinometer tube is equipped with a tube foot, and the top inclinometer tube is equipped with a tube cap. When splicing, the end of the inclinometer tube is connected to the pipe clamp and glue is applied in advance, then the pipe clamp is inserted for docking, and then waterproof tape is wrapped after docking.

[0049] See attached Figure 7.1 and 7.2 The buckle 2 is of "Ω" shape and is formed by bending a metal sheet, wherein the middle portion is a bending section 2-1 with a bending diameter of 8 cm, and the bending section has side wings 2-2 on both sides, and each side wing is provided with an opening 2-21 with a diameter of 1 cm.

[0050] The stud 3 has a diameter of 8 mm, and one end of the stud is welded to the inner wall of the steel cylinder for matching installation with the opening 2-21 on the side wing of the "Ω"-shaped buckle.

[0051] See attached Figure 8.1 and 8.2 The protection tube 4 is composed of a steel tube 4-1 welded with an angle steel 4-2. The inner diameter of the steel tube is 8 cm and the length is 40 cm. Angle steels are welded on both sides of the steel tube to form two wings with a length of 30 cm. The bottom surface of the angle steel is flush with the bottom surface of the steel tube. The protection tube is used to protect the pipe clamp connection of the ABS inclinometer tube.

[0052] See attached Figure 9.1 and 9.2 The pipe boot 5 is composed of a steel pipe 5-1 and an angle steel 5-2. The inner diameter of the steel pipe 5-1 is 8 cm and the length is 100 cm. Angle steels 5-2 are welded on both sides of the steel pipe to form two wings with a length of 80 cm. The bottom surface of the angle steel is flush with the bottom surface of the steel pipe. The bottom end of the steel pipe is wedge-shaped and has a bottom cover 5-3 to protect the bottom of the ABS inclinometer pipe and avoid the ABS inclinometer pipe from splitting and damage when the steel cylinder is vibrated and sunk.

[0053] Furthermore, when installing the inclinometer tube, it should be ensured that one side of the "cross groove" is perpendicular to the tube wall. Due to the processing accuracy of the inclinometer tube, the groove of the inclinometer tube will be twisted after splicing. The longer the splicing length, the more obvious the twisting phenomenon. Therefore, adjustment is required at intervals. During adjustment, one end of the inclinometer tube is fixed, and the adjustment position is manually twisted. The inclinometer tube is locked by tightening the nut on the "Ω"-shaped buckle.

[0054] See attached Fig.10 The cylinder wall stress monitoring system uses a static strain gauge to convert the stress according to the elastic modulus of the steel cylinder material:

[0055] σ=Eε

[0056] σ—stress

[0057] E—Elastic modulus of steel cylinder

[0058] ε—strain

[0059] A circumferential strain gauge and a vertical strain gauge are arranged on the cylinder wall above the sinking surface of the steel cylinder, and a circumferential strain gauge and three vertical strain gauges are arranged on the cylinder wall below the sinking surface. The three vertical strain gauges are arranged at equal intervals, and the circumferential strain gauge is arranged on one side of the vertical strain gauge above the transverse rib.

[0060] The strain gauge is installed on the strain gauge base, which is welded to the cylinder wall. After cooling, the strain gauge is installed, and then a protective box is installed for protection, which is filled with foam glue. After the strain gauge is installed, the cable of the strain gauge is straightened and led upward to the top of the cylinder, placed in the instrument box, and connected to the automatic data collection and transmission equipment after the on-site vibration sinking is placed in place to realize automatic data collection. The strain gauge cable is also protected by channel steel as a protective component. Angle steel is welded on both sides of the channel steel, and it is welded to the cylinder wall of the steel cylinder through the angle steel. Correspondingly, corresponding through holes are opened on the transverse ribs on the inner wall of the steel cylinder, so that the strain gauge cable can pass through the transverse ribs and be led upward.

[0061] See attached Fig.11 The soil pressure and water pressure monitoring system adopts soil pressure box L1 and piezometer L2. The soil pressure box and piezometer are installed on the outer wall area below the sinking surface of the steel cylinder. The cables of the soil pressure box and piezometer are protected by channel steel L3, vertically led upward along the channel steel to the top of the cylinder, and placed in the instrument box L4. It is used to monitor the soil pressure received by the steel cylinder under various construction conditions on the island side, the effect of excess hydrostatic pressure, and control the construction.

[0062] Furthermore, the channel steel is arranged along the axial direction of the steel cylinder, and a monitoring height surface is formed every 5m along the longitudinal direction of the channel steel. Two monitoring points are arranged horizontally on each monitoring height surface, and the two monitoring points on each monitoring height surface are arranged symmetrically with the channel steel as the symmetry axis. A soil pressure box and a piezometer are arranged at each monitoring point (the piezometer is as close to the soil pressure box as possible), and through holes are arranged at corresponding positions on both sides of the channel steel to allow the soil pressure box and a piezometer cable to enter the channel steel.

[0063] Furthermore, the earth pressure box and the piezometer are installed on the base, fixed to the outer wall of the steel cylinder through the base, sponge rubber is used for buffering at the hard connection, and the gap between the earth pressure box and the piezometer and the cable joint are wrapped with viscoelastic body.

[0064] For ease of explanation, spatial relative terms such as "upper", "lower", "left", "right" and the like are used in the embodiments to illustrate the relationship of one element or feature shown in the figure relative to another element or feature. It should be understood that, in addition to the orientation shown in the figure, the spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is inverted, the element described as being "under" other elements or features will be positioned "on" other elements or features. Therefore, the exemplary term "under" can include both upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here can be interpreted accordingly.

[0065] Furthermore, relational terms such as “first” and “second” and the like are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any such actual relationship or order between these components.

[0066] The present invention is described above by way of example. It should be noted that, without departing from the core of the present invention, any simple deformation, modification or other equivalent replacement that can be made by those skilled in the art without inventive effort falls within the protection scope of the present invention.

Claims

1. A comprehensive monitoring system for large-diameter thin-walled steel cylinders on island walls, characterized in that: include: Multi-stage automatic monitoring system for barrel deformation, manual monitoring system for barrel deformation, barrel wall stress monitoring system, soil pressure and water pressure monitoring system; The multi-stage automatic monitoring system for cylinder deformation, the manual monitoring system for cylinder deformation and the cylinder wall stress monitoring system are arranged on the inner wall of the steel cylinder, and the soil pressure and water pressure monitoring system are arranged on the outer wall of the steel cylinder; The multi-stage automatic monitoring system for cylinder deformation adopts an inclinometer sensor. Sensor fixing components are arranged at intervals along the axial direction of the steel cylinder on the inner wall of the steel cylinder, and an inclinometer sensor is installed in each sensor fixing component; the cable of the inclinometer sensor passes through the through hole on the transverse rib on the inner wall of the steel cylinder and is vertically led upward to the cylinder top and placed in an instrument box; the inclinometer sensor and its cable are protected by a protective component, which adopts a channel steel, the bottom of the channel steel is closed with a slanted foot, angle steels are welded on both sides of the channel steel, and the angle steels are welded to the cylinder wall of the steel cylinder, and the channel steels are arranged along the axial installation track of the sensor fixing component, so that all sensor fixing components and the inclinometer sensor cables led out of the sensor fixing component are enclosed therein; The manual monitoring system for cylinder deformation adopts an inclinometer tube. A through hole for installing the inclinometer tube is opened on the transverse rib on the inner wall of the steel cylinder along the axial direction of the steel cylinder. The inclinometer tube passes through the through hole installed on the transverse rib. The bottom end of the inclinometer tube reaches the upper edge of the lower reinforcing plate at the bottom of the steel cylinder, and the top end of the inclinometer tube reaches the lower edge of the upper reinforcing plate at the top of the steel cylinder. A pipe shoe is installed at the bottom end of the inclinometer tube, and the pipe shoe is welded to the cylinder wall of the steel cylinder. From the top of the pipe shoe, protective tubes and studs are alternately welded on the inner wall of the steel cylinder at intervals upward along the inclinometer tube; the inclinometer tube is spliced ​​by multiple sections of single inclinometer tubes through pipe clamps, the protective tube is sleeved on the pipe clamp connection of the inclinometer tube, a buckle is installed on the stud, and the buckle is buckled to the inclinometer tube through a nut, and a rubber pad is padded at the contact between the buckle and the inclinometer tube; The cylinder wall stress monitoring system adopts a static strain gauge, and at least one annular strain gauge and one vertical strain gauge are arranged on the cylinder wall above the sinking surface of the steel cylinder, and at least one annular strain gauge and multiple vertical strain gauges are arranged on the cylinder wall below the sinking surface. The multiple vertical strain gauges are arranged at equal intervals, and the annular strain gauge is arranged on the side of the vertical strain gauge above the transverse rib; the strain gauge is installed on the strain gauge base, and a protection box is installed for protection, and the protection box is filled with foam glue; the cable of the strain gauge is straightened and led upward to the top of the cylinder and placed in the instrument box; the strain gauge cable is protected by channel steel as a protective component, and angle steels are welded on both sides of the channel steel, and the angle steel is welded to the cylinder wall of the steel cylinder. Correspondingly, corresponding through holes are opened on the transverse ribs on the inner wall of the steel cylinder, so that the strain gauge cable can pass through the transverse ribs and be led upward; The soil pressure and water pressure monitoring system adopts a soil pressure box and a piezometer, which are installed on the outer wall area below the sinking surface of the steel cylinder. The cables of the soil pressure box and the piezometer are protected by channel steel, led vertically upward along the channel steel to the top of the cylinder, and placed in an instrument box; The sensor fixing member is composed of a steel pipe and two angle steels welded on both sides of the steel pipe. The bottom end of the steel pipe is closed by an iron sheet and a through hole is opened in the center of the iron sheet. The inner diameter of the steel pipe is 5 mm larger than the outer diameter of the inclinometer sensor. The diameter of the through hole in the center of the iron sheet is larger than the diameter of the fixing nut at the bottom of the inclinometer sensor. When installing, the edge of the angle steel is welded to the wall of the steel cylinder. The length of a single channel steel is equal to the spacing between the transverse ribs on the inner wall of the steel cylinder, and the ends of the channel steel are to be connected to the transverse ribs, opposite to the openings on the transverse ribs.

2. The island wall large diameter thin wall steel cylinder comprehensive monitoring system according to claim 1 is characterized by: The width of the channel steel is 0.3-0.5m.

3. The island wall large diameter thin wall steel cylinder comprehensive monitoring system according to claim 1 is characterized by: The standard length of a single inclinometer tube is 1-3 m, with a cross groove embedded therein.

4. The island wall large diameter thin wall steel cylinder comprehensive monitoring system according to claim 1 is characterized by: The buckle is "Ω"-shaped and is formed by bending a metal sheet, wherein the middle portion is a bent section, and the bent section has side wings on both sides, and each side wing is provided with an opening.

5. The island wall large diameter thin wall steel cylinder comprehensive monitoring system according to claim 4 is characterized by: One end of the stud is welded to the inner wall of the steel cylinder and is used for matching installation with the opening on the side wing of the "Ω"-shaped buckle.

6. The island wall large diameter thin wall steel cylinder comprehensive monitoring system according to claim 1 is characterized by: The protection pipe is formed by welding a steel pipe and an angle steel. The angle steels are welded on both sides of the steel pipe to form two wings. The bottom surface of the angle steel is flush with the bottom surface of the steel pipe. The protection pipe is used to protect the pipe clamp connection of the inclinometer pipe.

7. The island wall large diameter thin wall steel cylinder comprehensive monitoring system according to claim 1 is characterized by: The pipe boot is composed of a steel pipe and an angle steel. The angle steels are welded on both sides of the steel pipe to form two wings. The bottom surface of the angle steel is flush with the bottom surface of the steel pipe. The bottom end of the steel pipe is wedge-shaped and has a bottom cover.

8. The island wall large diameter thin wall steel cylinder comprehensive monitoring system according to claim 1 is characterized by: The channel steel of the soil pressure and water pressure monitoring system is arranged along the axial direction of the steel cylinder, and each interval of 3-6m along the longitudinal direction of the channel steel is a monitoring height surface, and two monitoring points are arranged horizontally on each monitoring height surface. The two monitoring points of each monitoring height surface are arranged symmetrically with the channel steel as the symmetry axis, and an earth pressure box and a piezometer are arranged at each monitoring point. Through holes are arranged at corresponding positions on both sides of the channel steel to allow the earth pressure box and a piezometer cable to enter the channel steel.

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