CN112268536A - Monitoring method for large-diameter thin-wall steel cylinder of island wall - Google Patents
Monitoring method for large-diameter thin-wall steel cylinder of island wall Download PDFInfo
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Abstract
The invention discloses a monitoring method for a large-diameter thin-wall steel cylinder of an island wall, aiming at a stratum undulating section and a steel cylinder at a curvature mutation position of the island wall, according to a geological survey condition of the island wall of an artificial island, a multi-section automatic monitoring system for cylinder body deformation, a cylinder wall stress monitoring system and a soil pressure and water pressure monitoring system are uniformly arranged at the sea side and the island side of the steel cylinder; aiming at a steel cylinder at the island wall curvature change part of a stratum containing a lens body section, arranging a cylinder body deformation manual monitoring system and a cylinder wall stress monitoring system at the island-facing side of the steel cylinder; aiming at a steel cylinder at the island wall curvature unchanged position of a uniform stratum section, arranging a cylinder body deformation manual monitoring system at the island-facing side of the steel cylinder; the invention can comprehensively obtain the stress deformation information of each steel cylinder of the island wall, and analyze the stress and deformation development conditions of the steel cylinder structure in each construction process 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
The invention relates to the technical field of monitoring methods, in particular to a monitoring method for a large-diameter thin-wall steel cylinder of an island wall.
Background
The large-diameter thin-wall steel cylinder is 35-40 m in height, 25-35 m in diameter and 20mm in cylinder wall thickness, is used as an island wall structure of a marine rapid island forming technology, and is successfully applied to a Ganzaoda bridge artificial island and a deep-channel artificial island. The large-diameter thin-wall steel cylinder is positioned on the island wall, the outer side of the large-diameter thin-wall steel cylinder faces the sea, the inner side of the large-diameter thin-wall steel cylinder is an island body construction surface, the two sides of the large-diameter thin-wall steel cylinder are connected with other steel cylinders through auxiliary grid arc-shaped plates, and the difference of stress working conditions of cylinder bodies is large; in order to ensure the safety and stability of the island wall structure in the island forming process, the thin-wall steel cylinder structure needs to be monitored. At present, the field of deformation monitoring of steel cylinders is still blank.
Disclosure of Invention
In order to comprehensively master the stress deformation state of the large-diameter thin-wall steel cylinder and ensure the safety and stability of the island wall structure, the invention provides a monitoring method for the large-diameter thin-wall steel cylinder of the island wall, so as to comprehensively obtain the stress deformation information of each part of the steel cylinder.
The invention is realized by the following technical scheme:
a monitoring method for island wall large diameter thin wall steel cylinder, comprising the following:
according to the geological exploration condition of the island wall of the artificial island, aiming at a stratum undulating section and a steel cylinder at the curvature mutation position of the island wall, a multi-section automatic monitoring system for cylinder body deformation, a cylinder wall stress monitoring system and a soil pressure and water pressure monitoring system are respectively arranged on the sea side and the island side of the steel cylinder; aiming at a steel cylinder at the island wall curvature change part of a stratum containing a lens body section, arranging a cylinder body deformation manual monitoring system and a cylinder wall stress monitoring system at the island-facing side of the steel cylinder; aiming at a steel cylinder at the island wall curvature unchanged position of a uniform stratum section, arranging a cylinder body deformation manual monitoring system at the island-facing side of the steel cylinder;
the multi-section automatic monitoring system for the deformation of the cylinder body adopts an inclinometer sensor, sensor fixing components are arranged on the inner wall of a steel cylinder at intervals along the axial direction of the cylinder body of the steel cylinder, and the inclinometer sensor is arranged in the sensor fixing components; after the inclinometer sensor is installed, a cable of the inclinometer sensor is vertically led upwards to the top of the cylinder and is placed in an instrument box, and after the inclinometer sensor is placed in place by vibration and sinking on site, automatic acquisition and transmission equipment is connected to realize automatic acquisition of data; the inclinometer sensor and cables thereof are protected by a protection component, the protection component is a channel steel, the bottom of the channel steel is sealed by inclined feet, two sides of the channel steel are welded with angle steel, the angle steel is welded on the cylinder wall of a steel cylinder through the angle steel, the protection component is arranged along the axial installation track of the sensor fixing component, and all the sensor fixing components and the inclinometer sensor cables led out from the sensor fixing components are sealed in the protection component;
the manual barrel deformation monitoring system adopts an inclinometer pipe, and holes are formed in the transverse ribs of the barrel wall along the axial marking line, so that the transverse ribs in the barrel wall are communicated up and down for installing the inclinometer pipe; the pipe comprises a horizontal rib, a plurality of inclined pipes, a pipe hoop, a protective pipe, a nut and a rubber gasket, wherein the inclined pipes are arranged in a hole on the horizontal rib in a penetrating manner, the inclined pipes are spliced by a plurality of sections of single pipes through the pipe hoop, the bottom ends of the inclined pipes are connected to the upper edge of a lower reinforcing plate at the bottom of a steel cylinder, the top ends of the inclined pipes are connected to the lower edge of an upper reinforcing plate at the top of the steel cylinder, pipe shoes are arranged at the bottom ends of the inclined pipes, the pipe shoes are welded to the wall of the steel cylinder, the protective pipes and the threaded studs are alternately welded on the inner wall of the steel cylinder at intervals from the tops of the pipe shoes upwards along the inclined pipes, the protective pipes are sleeved at the joint of;
the cylinder wall stress monitoring system adopts static strain gauges, a circumferential strain gauge and a vertical strain gauge are arranged on the cylinder wall above a sinking surface of the steel cylinder, the circumferential strain gauge and the 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 gauges are arranged at one side of the vertical strain gauges above the transverse ribs; the strain gauge is arranged on the strain gauge base, and is protected by a protection box filled with foam rubber; after the strain gauge is installed, the cable of the strain gauge is straightened and led upwards to the top of the cylinder, the strain gauge is placed in an instrument box, and after the field vibration and sinking are placed in place, automatic acquisition and transmission equipment is connected to realize automatic acquisition of data; the strain gauge cable is also protected by adopting channel steel as a protection component, angle steel is welded on two sides of the channel steel and is welded on the wall of the steel cylinder through the angle steel, and correspondingly, a corresponding through hole is formed in a transverse rib on the inner wall of the steel cylinder, so that the strain gauge cable can penetrate through the transverse rib and be led out upwards;
soil pressure and water pressure monitoring system adopts soil pressure cell and osmometer, and soil pressure cell and osmometer are installed on the outer wall region below the steel drum sunken face, and the cable of soil pressure cell and osmometer is protected through the channel-section steel, along the vertical upwards guide bobbin top of channel-section steel, arrange the instrument case in for the soil pressure that the monitoring steel drum received under each construction operating mode of island side, the effect of super hydrostatic pressure, control construction.
In the technical scheme, the sensor fixing component comprises a steel pipe and two pieces of angle steel welded on two sides of the steel pipe, the bottom end of the steel pipe is sealed by an iron sheet, a through hole is formed in the center of the iron sheet, the inner diameter of the steel pipe is 5mm 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 that of a fixing nut at the bottom of the inclinometer sensor, and the edge of the angle steel is welded on the wall of a steel cylinder during installation.
In the technical scheme, the transverse ribs are arranged on the inner wall of the steel cylinder, so that a total station is used for accurately positioning and marking a marking line on the cylinder wall before installation, the marking line is parallel to the axis of the steel cylinder, namely the marking line is arranged along the axial direction of the steel cylinder, and the transverse ribs on the cylinder wall are perforated along the marking line, so that the transverse ribs in the cylinder wall are communicated up and down to enable a cable of the inclinometer sensor to penetrate through the transverse ribs and be led out upwards; further, the length of channel-section steel equals the interval between the horizontal rib, and the both ends of channel-section steel will be connected to the horizontal rib promptly to comprehensively protect the cable, prevent that the cable from exposing.
In the technical scheme, the standard length of a single tube of the inclinometer tube is 1-3m, the cross groove is embedded in the inclinometer tube, when the inclinometer tube is spliced, the end of the inclinometer tube is connected to the position of the tube hoop and is coated with glue in advance, then the tube hoop is inserted for butt joint, and the waterproof adhesive tape is wound after the butt joint.
In the technical scheme, the buckle is in an omega shape and formed by bending a metal sheet, the middle part of the buckle is a bending section, two sides of the bending section are provided with side wings, and each side wing is provided with an opening.
In the technical scheme, one end of the stud is welded on the inner wall of the steel cylinder and is used for being matched with the opening on the omega-shaped buckle side wing for installation.
In the technical scheme, the protection pipe is formed by welding a steel pipe and angle steel, the angle steel is welded on two 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, and the protection pipe is used for protecting a pipe hoop joint of the inclinometer pipe.
In the technical scheme, the pipe shoe comprises a steel pipe and angle steel, the two sides of the steel pipe are welded with the angle steel 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 is provided with a bottom cover to protect the bottom of the inclinometer pipe and avoid the fracture and the damage of the inclinometer pipe when a steel cylinder is vibrated and sunk.
In the technical scheme, the channel steel of the soil pressure and water pressure monitoring system is axially arranged along the steel cylinder, a monitoring height surface is arranged at each interval of 3-6m along the longitudinal direction of the channel steel, two monitoring point positions are transversely arranged on each monitoring height surface, the two monitoring point positions of each monitoring height surface are symmetrically arranged by taking the channel steel as a symmetry axis, a soil pressure box and a osmometer are arranged on each monitoring point position, and through holes are formed in corresponding positions of two sides of the channel steel so that a soil pressure box and a osmometer cable enter the channel steel.
In the technical scheme, the soil pressure cell and the osmometer are installed on the base and fixed with the outer wall of the steel cylinder through the base, the hard link is buffered by adopting the sponge rubber, and gaps between the soil pressure cell and the osmometer and cable joints are wrapped by viscoelastic bodies.
The invention has the advantages and beneficial effects that:
according to the geological condition of the island wall of the artificial island, different monitoring means are adopted for large-diameter steel cylinders at different positions of the island wall, so that the stress deformation information of the steel cylinders at all parts of the island wall is comprehensively obtained, the stress and deformation development conditions of the steel cylinder structure in each construction process of the artificial island are analyzed, the construction progress is controlled, the construction process is optimized, and the safety and stability of the island wall structure are ensured. Meanwhile, basic data are provided for perfecting theoretical calculation of the steel cylinder structure. Each monitoring system of the steel cylinder has the advantages of stable structure, simple and convenient manufacture and installation and low cost.
Drawings
Fig. 1 is a schematic structural view of a multi-stage automatic monitoring system for barrel deformation.
Fig. 2 is a schematic top view of a sensor fixing member in the multi-stage automatic monitoring system for barrel deformation.
Fig. 3 is a schematic side view of a sensor fixing member in the multi-stage automatic monitoring system for barrel deformation.
Fig. 4 is a schematic view of the installation structure of the manual barrel deformation monitoring system.
Fig. 5 is a partially enlarged view of the protection tube of fig. 4.
Fig. 6 is a partially enlarged view of the snap in fig. 4.
Fig. 7.1 is a front view structural view of the buckle in fig. 4.
Fig. 7.2 is a top view structural diagram of the buckle in fig. 4.
Fig. 8.1 is a front view structural view of the protective tube in fig. 4.
Fig. 8.2 is a top view of the protective tube of fig. 4.
Figure 9.1 is a side view block diagram of the boot of figure 4.
Fig. 9.2 is a top view of the pipe shoe of fig. 4.
FIG. 10 is a schematic view of the installation configuration of the wall stress monitoring system.
Fig. 11 is a schematic view of the installation structure of the soil pressure and water pressure monitoring system.
For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the present invention is further described below with reference to specific examples.
A monitoring method for island wall large diameter thin wall steel cylinder, comprising the following:
according to the geological exploration condition of the island wall of the artificial island, determining the monitoring items of each steel cylinder, wherein the monitoring items and the arrangement positions of monitoring points under each monitoring level are shown in the table 1, and specifically, the monitoring items comprise:
aiming at the steel cylinder at the stratum bending section and the island wall curvature abrupt change position, a multi-section automatic monitoring system for cylinder body deformation, a cylinder wall stress monitoring system and a soil pressure and water pressure monitoring system are respectively arranged at the sea side and the island side of the steel cylinder. The curvature mutation position means that the included angle of the circle center connecting lines of the adjacent steel cylinders is less than 120 degrees.
Aiming at a steel cylinder at the island wall curvature change part of a stratum containing a lens body section, a cylinder body deformation manual monitoring system and a cylinder wall stress monitoring system are arranged on the side of the steel cylinder facing an island. The curvature change part means that the included angle of the connecting line of the circle centers of the adjacent steel cylinders is between 120 degrees and 180 degrees.
Aiming at the steel cylinder at the island wall curvature unchanged position of the even section of the stratum, a cylinder body deformation manual monitoring system is arranged at the island-facing side of the steel cylinder.
Table 1 monitoring item classification table
The wall thickness of a large-diameter thin-wall steel cylinder is 20mm, reinforcing transverse ribs and reinforcing longitudinal ribs are arranged on the inner wall of the cylinder, and the steel cylinder completes the installation of each monitoring system during the prefabrication period of a factory; and (3) before installation, using a total station to perform line-releasing positioning on the sea side and the island side of the steel cylinder, wherein the positioning deviation is +/-20 cm.
Referring to the attached drawings 1-3, the multi-section automatic monitoring system for cylinder deformation adopts an inclinometer sensor, sensor fixing components M1 are arranged on the inner wall of a steel cylinder at intervals of 3M along the axial direction of the cylinder body of the steel cylinder, the inclinometer sensor is installed in the sensor fixing components, the inclinometer sensor faces to the inside of the cylinder in a plus direction, the reading of the inclinometer sensor is made to be as close to 0 as possible, the bottom of the steel cylinder is used as a base point, and the deformation of the cylinder body is calculated in a mode of gradient iteration from bottom to top.
The sensor fixing component M1 is composed of a steel pipe M1-1 and two pieces of angle steel M1-2 welded on two sides of the steel pipe, the bottom end of the steel pipe is closed by an iron sheet M1-3, a through hole M1-31 is formed in the center of the iron sheet, the inner diameter of the steel pipe is 5mm 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 2mm larger than the diameter of a fixing nut at the bottom of the inclinometer sensor, and the edge of the angle steel is welded on the wall of a steel cylinder.
After the inclinometer sensor is installed, the cable of the inclinometer sensor is vertically led upwards to the top of the cylinder and placed in an instrument box M2, and after the inclinometer sensor is placed in place by field vibration and sinking, the cable is connected with automatic acquisition and transmission equipment to realize automatic acquisition of data.
The inclinometer sensor and cables thereof are protected by a protection component M3, the protection component M3 is a channel steel, the bottom of the channel steel is sealed by an inclined pin M3-1, two sides of the channel steel are welded with angle steel M3-2, the angle steel M3-2 is welded on the wall of a steel cylinder, the protection component M3 is arranged along the axial installation track of the sensor fixing component M1, and all the sensor fixing components M1 and the inclinometer sensor cables led out from the sensor fixing components are sealed in the protection component, so that good protection is realized; because the transverse ribs are arranged on the inner wall of the steel cylinder, a total station is used for accurately positioning and marking a marking line on the cylinder wall before installation, the marking line is parallel to the axis of the steel cylinder, namely the marking line is arranged along the axial direction of the steel cylinder, and the transverse ribs on the cylinder wall are perforated along the marking line, so that the transverse ribs in the cylinder wall are communicated up and down to enable a cable of an inclinometer sensor to penetrate through the transverse ribs and be led out upwards; further, the length of channel-section steel equals the interval between the horizontal rib, and the both ends of channel-section steel will be connected to the horizontal rib promptly to comprehensively protect the cable, prevent that the cable from exposing.
Referring to fig. 4-9.2, in the manual barrel deformation monitoring system, an ABS inclinometer tube 1 is adopted, and holes are formed on the transverse ribs of the barrel wall along the axial marking line, so that the transverse ribs in the barrel wall are communicated up and down for installing the inclinometer tube 1; the inclinometer is arranged in a hole in the transverse rib in a penetrating mode, the inclinometer is formed by splicing a plurality of sections of inclinometer single tubes through a tube hoop 6, the bottom end of the inclinometer is connected to the upper edge of a lower reinforcing plate A-3 at the bottom of the steel cylinder, the top end of the inclinometer is connected to the lower edge of an upper reinforcing plate A-2 at the top of the steel cylinder, a tube shoe 5 is arranged at the bottom end of the inclinometer and is welded on the wall of the steel cylinder, a protection tube 4 and a stud 3 are alternately welded on the inner wall of the steel cylinder at intervals from the top of the tube shoe upwards along the inclinometer, the protection tube 4 is sleeved at the joint of the tube hoop of the inclinometer, a buckle 2 is arranged on the stud 3 and is buckled on the inclinometer 1 through a nut, and a rubber pad is.
The standard length of the single tubes of the ABS inclinometer is 2m, a cross groove is embedded in the single tubes, the single tubes of the ABS inclinometer are connected through a pipe hoop 6 (see attached figure 5), the bottommost inclinometer is provided with a pin, and the topmost inclinometer is provided with a pipe cap. When splicing, the end of the inclinometer pipe is connected to the pipe hoop part and is coated with glue in advance, then the pipe hoop is inserted for butt joint, and the waterproof adhesive tape is wound after the butt joint.
Referring to the attached fig. 7.1 and 7.2, the buckle 2 is in an omega shape and is formed by bending a metal sheet, wherein the middle part of the buckle is a bending section 2-1 with the bending diameter of 8cm, two sides of the bending section are provided with side wings 2-2, and each side wing is provided with an opening 2-21 with the opening diameter of 1 cm.
The diameter of the stud 3 is 8mm, one end of the stud is welded on the inner wall of the steel cylinder and is used for being matched with the opening 2-21 on the omega-shaped buckle side wing for installation.
Referring to the attached figures 8.1 and 8.2, the protection pipe 4 is formed by welding a steel pipe 4-1 and angle steel 4-2, the inner diameter of the steel pipe is 8cm, the length of the steel pipe is 40cm, the angle steel is welded on two sides of the steel pipe to form two wings, the length of the steel pipe is 30cm, the bottom surface of the angle steel is flush with the bottom surface of the steel pipe, and the protection pipe is used for protecting a pipe hoop joint of an ABS inclinometer pipe.
Referring to the attached figures 9.1 and 9.2, the pipe shoe 5 is composed of a steel pipe 5-1 and angle steel 5-2, the inner diameter of the steel pipe 5-1 is 8cm, the length of the steel pipe is 100cm, the angle steel 5-2 is welded on two sides of the steel pipe to form two wings, the length of the steel pipe is 80cm, 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 a bottom cover 5-3 is arranged to protect the bottom of the ABS inclinometer pipe and avoid the ABS inclinometer pipe from.
Furthermore, when the inclinometer is installed, the clamping groove on one side of the cross groove is perpendicular to the cylinder wall, due to the machining precision of the inclinometer, the clamping groove of the spliced inclinometer can be twisted, the longer the splicing length is, the more obvious the twisting phenomenon is, therefore, the inclinometer needs to be adjusted at intervals, one end of the inclinometer is fixed during adjustment, the adjustment position is manually twisted, and the inclinometer is locked by screwing the nut on the omega-shaped buckle.
Referring to fig. 10, the cylinder wall stress monitoring system obtains stress by converting the elastic modulus of the steel cylinder material by using a static strain gauge:
σ＝Eε
sigma-stress
E-modulus of elasticity of steel cylinder
Epsilon-strain
The method comprises the following steps that a circumferential strain gauge and a vertical strain gauge are arranged on the cylinder wall above a sinking surface of a steel cylinder, the circumferential strain gauge and the 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 gauges are arranged at one side of the vertical strain gauges above the transverse ribs.
The strain gauge is installed on a strain gauge base, the strain gauge base is welded on the cylinder wall, the strain gauge is installed after cooling, then a protection box is installed for protection, and foam rubber is filled in the protection box; after the strain gauge is installed, the cable of the strain gauge is straightened and upwards led to the top of the cylinder, the strain gauge is placed in an instrument box, and after the strain gauge is placed in place in a field vibration and sinking mode, the strain gauge is connected with automatic acquisition and transmission equipment to achieve automatic data acquisition. The strain gauge cable is protected by adopting a channel steel as a protection component, angle steel is welded on two sides of the channel steel and welded on the wall of the steel cylinder through the angle steel, and correspondingly, a corresponding through hole is formed in a transverse rib on the inner wall of the steel cylinder, so that the strain gauge cable can penetrate through the transverse rib and be led out upwards.
Referring to the attached drawing 11, the soil pressure and water pressure monitoring system adopts a soil pressure box L1 and an osmometer L2, the soil pressure box and the osmometer are installed on an outer wall area below a sinking surface of a steel cylinder, cables of the soil pressure box and the osmometer are protected through a channel steel L3, lead to the top of the cylinder vertically and upwards along the channel steel, and are arranged in an instrument box L4 for monitoring the soil pressure received by the steel cylinder under each construction working condition at the island side and controlling construction under the action of super hydrostatic pressure.
Furthermore, the channel-section steel sets up along steel drum axial, is a monitoring height face along the vertical every interval 5m of channel-section steel, and every monitoring height face transversely sets up two monitoring point locations, and two monitoring point locations of every monitoring height face use the channel-section steel to be symmetry arrangement, and every monitoring point location arranges a soil pressure cell and an osmometer (osmometer is close to soil pressure cell as far as possible), and the both sides of channel-section steel correspond the position and are provided with the through-hole to make soil pressure cell and an osmometer cable get into the channel-section steel.
Furthermore, the soil pressure cell and the osmometer are arranged on the base and fixed with the outer wall of the steel cylinder through the base, the hard link position is buffered by adopting sponge rubber, and the gap position between the soil pressure cell and the osmometer and the cable joint position are wrapped by viscoelastic bodies.
Spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used in the embodiments for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Moreover, relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.
The invention has been described in an illustrative manner, and it is to be understood that any simple variations, modifications or other equivalent changes which can be made by one skilled in the art without departing from the spirit of the invention fall within the scope of the invention.
Claims (10)
1. A monitoring method for a large-diameter thin-wall steel cylinder of an island wall is characterized by comprising the following steps:
according to the geological exploration condition of the island wall of the artificial island, aiming at a stratum undulating section and a steel cylinder at the curvature mutation position of the island wall, a multi-section automatic monitoring system for cylinder body deformation, a cylinder wall stress monitoring system and a soil pressure and water pressure monitoring system are respectively arranged on the sea side and the island side of the steel cylinder; aiming at a steel cylinder at the island wall curvature change part of a stratum containing a lens body section, arranging a cylinder body deformation manual monitoring system and a cylinder wall stress monitoring system at the island-facing side of the steel cylinder; aiming at a steel cylinder at the island wall curvature unchanged position of a uniform stratum section, arranging a cylinder body deformation monitoring system at the island-facing side of the steel cylinder;
the multi-section automatic monitoring system for the deformation of the cylinder body adopts an inclinometer sensor, sensor fixing components are arranged on the inner wall of a steel cylinder at intervals along the axial direction of the cylinder body of the steel cylinder, and the inclinometer sensor is arranged in the sensor fixing components; after the inclinometer sensor is installed, a cable of the inclinometer sensor is vertically led upwards to the top of the cylinder and is placed in an instrument box, and after the inclinometer sensor is placed in place by vibration and sinking on site, automatic acquisition and transmission equipment is connected to realize automatic acquisition of data; the inclinometer sensor and cables thereof are protected by a protection component, the protection component is a channel steel, the bottom of the channel steel is sealed by inclined feet, two sides of the channel steel are welded with angle steel, the angle steel is welded on the cylinder wall of a steel cylinder through the angle steel, the protection component is arranged along the axial installation track of the sensor fixing component, and all the sensor fixing components and the inclinometer sensor cables led out from the sensor fixing components are sealed in the protection component;
the manual barrel deformation monitoring system adopts an inclinometer pipe, and holes are formed in the transverse ribs of the barrel wall along the axial marking line, so that the transverse ribs in the barrel wall are communicated up and down for installing the inclinometer pipe; the pipe comprises a horizontal rib, a plurality of inclined pipes, a pipe hoop, a protective pipe, a nut and a rubber gasket, wherein the inclined pipes are arranged in a hole on the horizontal rib in a penetrating manner, the inclined pipes are spliced by a plurality of sections of single pipes through the pipe hoop, the bottom ends of the inclined pipes are connected to the upper edge of a lower reinforcing plate at the bottom of a steel cylinder, the top ends of the inclined pipes are connected to the lower edge of an upper reinforcing plate at the top of the steel cylinder, pipe shoes are arranged at the bottom ends of the inclined pipes, the pipe shoes are welded to the wall of the steel cylinder, the protective pipes and the threaded studs are alternately welded on the inner wall of the steel cylinder at intervals from the tops of the pipe shoes upwards along the inclined pipes, the protective pipes are sleeved at the joint of;
the cylinder wall stress monitoring system adopts static strain gauges, a circumferential strain gauge and a vertical strain gauge are arranged on the cylinder wall above a sinking surface of the steel cylinder, the circumferential strain gauge and the 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 gauges are arranged at one side of the vertical strain gauges above the transverse ribs; the strain gauge is arranged on the strain gauge base, and is protected by a protection box filled with foam rubber; after the strain gauge is installed, the cable of the strain gauge is straightened and led upwards to the top of the cylinder, the strain gauge is placed in an instrument box, and after the field vibration and sinking are placed in place, automatic acquisition and transmission equipment is connected to realize automatic acquisition of data; the strain gauge cable is also protected by adopting channel steel as a protection component, angle steel is welded on two sides of the channel steel and is welded on the wall of the steel cylinder through the angle steel, and correspondingly, a corresponding through hole is formed in a transverse rib on the inner wall of the steel cylinder, so that the strain gauge cable can penetrate through the transverse rib and be led out upwards;
soil pressure and water pressure monitoring system adopts soil pressure cell and osmometer, and soil pressure cell and osmometer are installed on the outer wall region below the steel drum sunken face, and the cable of soil pressure cell and osmometer is protected through the channel-section steel, along the vertical upwards guide bobbin top of channel-section steel, arrange the instrument case in for the soil pressure that the monitoring steel drum received under each construction operating mode of island side, the effect of super hydrostatic pressure, control construction.
2. The monitoring method for island wall large-diameter thin-wall steel cylinder according to claim 1, characterized in that: the sensor fixing component comprises a steel pipe and two pieces of angle steel welded on two sides of the steel pipe, the bottom end of the steel pipe is sealed by an iron sheet, a through hole is formed in the center of the iron sheet, the inner diameter of the steel pipe is 5mm 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 that of a fixing nut at the bottom of the inclinometer sensor, and the edge of the angle steel is welded on the wall of the steel cylinder during installation.
3. The monitoring method for island wall large-diameter thin-wall steel cylinder according to claim 1, characterized in that: before installation, a total station is used for accurately positioning and marking a marking line on the cylinder wall, wherein the marking line is parallel to the axis of the steel cylinder, namely the marking line is arranged along the axial direction of the steel cylinder, and a transverse rib on the cylinder wall is perforated along the marking line, so that the transverse rib in the cylinder wall is communicated up and down to enable a cable of the inclinometer sensor to penetrate through the transverse rib and be led out upwards; further, the length of channel-section steel equals the interval between the horizontal rib, and the both ends of channel-section steel will be connected to the horizontal rib promptly to comprehensively protect the cable, prevent that the cable from exposing.
4. The monitoring method for island wall large-diameter thin-wall steel cylinder according to claim 1, characterized in that: the standard length of a single tube of the inclinometer is 1-3m, a cross groove is embedded in the inclinometer, when the inclinometer is spliced, the end of the inclinometer is connected to a pipe hoop part, glue is smeared in advance, then the pipe hoop is inserted for butt joint, and waterproof adhesive tapes are wound after the butt joint.
5. The monitoring method for island wall large-diameter thin-wall steel cylinder according to claim 1, characterized in that: the buckle is 'omega' type, is formed by the sheetmetal bending, and the middle part is the bending section, and bending section both sides have the flank, all are provided with the trompil on every flank.
6. The monitoring method for island wall large-diameter thin-wall steel cylinder according to claim 1, characterized in that: one end of the stud is welded on the inner wall of the steel cylinder and is used for being matched with the opening on the omega-shaped buckle flank for installation.
7. The monitoring method for island wall large-diameter thin-wall steel cylinder according to claim 1, characterized in that: the protection tube is formed by welding a steel tube and angle steel, the angle steel is welded on two 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, and the protection tube is used for protecting a pipe hoop joint of the inclinometer pipe.
8. The monitoring method for island wall large-diameter thin-wall steel cylinder according to claim 1, characterized in that: the pipe shoe comprises steel pipe and angle steel, and steel pipe both sides welding angle steel form the both wings, and the angle steel bottom surface flushes with the steel pipe bottom surface, and the steel pipe bottom is the wedge to bottom has, to the protection deviational survey socle bottom avoids the steel drum to shake when sinking deviational survey pipe splitting to destroy.
9. The monitoring method for island wall large-diameter thin-wall steel cylinder according to claim 1, characterized in that: the channel steel of the soil pressure and water pressure monitoring system is axially arranged along the steel cylinder, a monitoring height surface is arranged at each interval of 3-6m along the longitudinal direction of the channel steel, two monitoring point positions are transversely arranged on each monitoring height surface, the two monitoring point positions of each monitoring height surface are symmetrically arranged by taking the channel steel as a symmetry axis, a soil pressure box and an osmometer are arranged at each monitoring point position, through holes are formed in corresponding positions of two sides of the channel steel, and therefore a soil pressure box and an osmometer cable can enter the channel steel.
10. The monitoring method for island wall large-diameter thin-wall steel cylinder according to claim 1, characterized in that: the soil pressure cell and the osmometer are installed on the base and fixed with the outer wall of the steel cylinder through the base, the hard link position is buffered by sponge rubber, and the gap position of the soil pressure cell and the osmometer and the cable joint position are wrapped by viscoelastic bodies.
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