An underwater deep foundation pit deformation monitoring system and a monitoring method

Abstract

The application discloses an underwater deep foundation pit deformation monitoring system and a monitoring method, and belongs to the technical field of foundation pit construction. The problem that the existing monitoring system is not applicable to underwater deep foundation pit deformation monitoring is solved. The underwater deep foundation pit deformation monitoring system comprises a first supporting structure, a second supporting structure, a fixed connecting part, a deformation detection part and a water leakage detection part. The first supporting structure extends into the underwater deep foundation pit and is in contact connection with the inner wall of the underwater deep foundation pit. The first supporting structure is sleeved outside the second supporting structure. A plurality of fixed connecting parts and a plurality of deformation detection parts are arranged in the gap between the first supporting structure and the second supporting structure. The deformation detection part comprises a detection rod and a plurality of strain sensors arranged on the detection rod. A plurality of water leakage detection parts are arranged on the inner side of the first supporting structure. The water leakage detection part comprises a vibration sensor, and the vibration sensor is used for detecting the vibration of the inner side of the first supporting structure. The application realizes the monitoring of the deformation and water leakage of the underwater deep foundation pit.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of foundation pit construction, in particular to a deep underwater foundation pit deformation monitoring system and a monitoring method. BACKGROUND

[0002] Deep underwater foundation pit technology is widely used in various engineering projects that need to be carried out underwater, and its application fields cover traffic engineering (such as river-crossing and sea-crossing bridge and tunnel engineering, etc.) and water conservancy engineering (such as reservoirs, dams, etc.) and many other aspects. These projects need to pass through water or be carried out in underwater environment, and deep foundation pit technology is one of the key construction means.

[0003] When excavating a deep foundation pit, cofferdams and other methods can be used. Since the rock-soil and silt located below the water surface are rich in water, after the supporting structure is installed, the supporting structure will not only be subjected to the extrusion force of the underground rock-soil, but also be subjected to the action of water in the rock-soil. Under the action of water pressure, the supporting structure may have a leakage point, and at the leakage point, the supporting structure may have obvious deformation, which represents that the leakage point is caused by external force on the supporting structure; or the supporting structure may not have obvious deformation, which represents that the leakage point is a structural defect of the supporting structure. Deep foundation pit deformation is a dynamic process, especially in underwater environment, which is more significantly affected by water pressure, water flow and other factors. The deformation and water leakage of the deep foundation pit directly affect the stability of the foundation pit and the safety of the construction during the construction process.

[0004] However, the common foundation pit supporting structure monitoring system in the prior art usually only monitors the deformation of the deep foundation pit supporting structure on land. Since the rock-soil around the deep foundation pit on land is less rich in water, it is usually local groundwater or rainwater, so it cannot monitor the water leakage of the deep foundation pit, nor can it determine the relationship between water leakage and deformation. Therefore, the existing foundation pit deformation monitoring system cannot meet the monitoring needs of the deep underwater foundation pit. SUMMARY

[0005] In view of the above analysis, the present application aims to provide a deep underwater foundation pit deformation monitoring system and a monitoring method, which solves the problem that the existing foundation pit monitoring system is not suitable for deep underwater foundation pit deformation monitoring. The present application can not only monitor the deformation of the foundation pit supporting structure, but also monitor the water leakage of the foundation pit.

[0006] The main purpose of the present application is achieved through the following technical solutions:

[0007] In a first aspect, the embodiments of the present application provide a deformation monitoring system for a deep underwater foundation pit, comprising: a first supporting structure extending into the deep underwater foundation pit, an outer wall of the first supporting structure being in contact with an inner wall of the deep underwater foundation pit; a second supporting structure, the first supporting structure being sleeved outside the second supporting structure, and a gap being provided between the first supporting structure and the second supporting structure; a plurality of fixed connecting parts provided between the first supporting structure and the second supporting structure and fixedly connected with the first supporting structure and the second supporting structure; a plurality of deformation detecting parts provided between the first supporting structure and the second supporting structure, each of the deformation detecting parts comprising a detection rod and a strain sensor, one end of the detection rod along an axial direction of the detection rod being connected with the inner wall of the first supporting structure, the other end of the detection rod being connected with an outer wall of the second supporting structure, and a plurality of strain sensors being provided on the outer wall of the detection rod along a circumferential direction of the detection rod; and a plurality of water leakage detecting parts provided on an inner side of the first supporting structure, each of the water leakage detecting parts comprising a vibration sensor for detecting vibration on the inner side of the first supporting structure.

[0008] According to the embodiments of the first aspect of the present application, in a plane perpendicular to the axial direction of the first supporting structure, the cross-sectional shape of the first supporting structure is the same as the cross-sectional shape of the second supporting structure, and the distance between the inner wall of the first supporting structure and the outer wall of the second supporting structure is equal everywhere.

[0009] According to the embodiments of the first aspect of the present application, in a plane perpendicular to the axial direction of the first supporting structure, the cross-sectional shape of the first supporting structure is circular, elliptical or polygonal.

[0010] According to the embodiments of the first aspect of the present application, the plurality of fixed connecting parts comprises a plurality of connecting piece groups, each of the connecting piece groups being equidistantly arranged along the axial direction of the first supporting structure; each of the connecting piece groups comprises a plurality of fixed connecting pieces and a plurality of fasteners, one end of each of the fixed connecting pieces along a circumferential direction of the fixed connecting piece being threadedly connected with a threaded hole of the inner wall of the first supporting structure, the other end of each of the fixed connecting pieces penetrating through the second supporting structure and being threadedly connected with a fastener, and each of the fasteners being in abutment with the inner wall of the second supporting structure.

[0011] According to the embodiments of the first aspect of the present application, the plurality of fixed connecting pieces in each of the connecting piece groups are arranged locally along the circumferential direction of the first supporting structure, and the plurality of fixed connecting pieces in at least two of the connecting piece groups are arranged at the same position along the circumferential direction of the first supporting structure.

[0012] According to the embodiments of the first aspect of the present application, the first supporting structure is provided with a mounting through hole, each of the deformation detecting parts further comprises a mounting part fixedly connected with the mounting through hole, the mounting part is provided with a first abutment hole, the inner wall of the second supporting structure is provided with a second abutment hole, and each of the detection rods is provided with an abutment pin at each of the two ends along the axial direction of the detection rod, the abutment pin being inserted into the first abutment hole and the second abutment hole respectively, the detection rod being in abutment with the mounting part and the second supporting structure.

[0013] According to the embodiment of the first aspect of the present application, the cross-sectional shape of the deformation detection part in the plane perpendicular to the axial direction of the deformation detection part is a square, and the outer walls corresponding to one pair of opposite sides of the square are perpendicular to the axial direction of the first support structure, and the outer walls corresponding to the other pair of opposite sides of the square are parallel to the axial direction of the first support structure.

[0014] According to the embodiment of the first aspect of the present application, the plurality of deformation detection parts include a plurality of detection part groups, and the plurality of detection part groups are equidistantly arranged along the axial direction of the first support structure; each detection part group includes a plurality of detection rods; and along the inner wall of the first support structure, the geodesic distance between each detection rod and the plurality of fixed connection parts has a minimum value, and the geodesic distance between at least two fixed connection parts and the detection rod is equal to the minimum value.

[0015] According to the embodiment of the first aspect of the present application, the underwater deep foundation pit deformation monitoring system further comprises a water pumping assembly for pumping out water in the gap between the first support structure and the second support structure.

[0016] According to the embodiment of the first aspect of the present application, along the inner wall of the first support structure, the geodesic distance between each water leakage detection part and the plurality of fixed connection parts has a minimum value, and the geodesic distance between at least four fixed connection parts and the plurality of water leakage detection parts is equal to the minimum value.

[0017] In a second aspect, the embodiments of the present application provide a method for monitoring deformation of an underwater deep foundation pit, which uses the underwater deep foundation pit deformation monitoring system of the first aspect of the present application. The method for monitoring deformation of an underwater deep foundation pit comprises: obtaining the deformation amount of each detection rod through the plurality of strain sensors of each deformation detection part; obtaining the deformation amount of each part of the first support structure according to the deformation amount of each detection rod; detecting whether there is water leakage at each part of the first support structure according to the water leakage detection part; and when there is water leakage at a certain part of the first support structure, or the total deformation amount at a certain part is greater than a critical deformation amount, the underwater deep foundation pit has a risk of deformation.

[0018] Compared with the prior art, the present application has at least one of the following beneficial effects:

[0019] A) The underwater deep foundation deformation monitoring system provided by the embodiment of the present application, the first supporting structure and the second supporting structure are sleeved, the first supporting structure is in contact with the inner wall of the deep foundation to support the deep foundation, and the second supporting structure surrounds a space that can be used to pour a supporting column of an overwater building. The fixed connection part can connect the first supporting structure and the second supporting structure into an integral whole, thereby improving the stability of the first supporting structure and the second supporting structure. The deformation detection part is arranged between the first supporting structure and the second supporting structure, when the inner wall rock-soil of the underwater deep foundation exerts a force on the first supporting structure and causes the first supporting structure to produce slight deformation, the detection rod of the deformation detection part will produce stress-strain change and be detected by the strain sensor, which can be used to judge the deformation amount of the first supporting structure at each place. If the deformation amount of the first supporting structure at a certain place is greater than the critical deformation amount, it represents that the deformation of the first supporting structure is too large, and the hole wall deformation of the underwater deep foundation is too large. The water leakage detection part is arranged on the inner side of the first supporting structure, and the water leakage of the first supporting structure is judged by detecting the vibration of the inner side of the first supporting structure.

[0020] B) The underwater deep foundation deformation monitoring method provided by the embodiment of the present application can comprehensively judge the deformation degree of the first supporting structure according to the detection results of the deformation detection part and the water leakage detection part, so as to more accurately judge the deformation of the underwater deep foundation and the risk caused by the deformation.

[0021] In the present application, the above technical solutions can be combined with each other to realize more preferred combination solutions. Other features and advantages of the present application will be described in the subsequent description, and some advantages will become apparent from the description, or will be understood by implementing the present application. The purpose and other advantages of the present application can be realized and obtained from the contents specifically pointed out in the description and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings are included to provide a further understanding of the embodiments and are incorporated in and constitute a part of this specification, illustrate embodiments of the present application and together with the description serve to explain the principles of the present application, and should not be necessarily construed as limiting the present application.

[0023] Figure 1 It is a structural schematic view of the underwater deep foundation deformation monitoring system of the embodiment of the present application;

[0024] Figure 2 It is another structural schematic view of the underwater deep foundation deformation monitoring system of the embodiment of the present application;

[0025] Figure 3 It is a structural schematic view of the first supporting structure and the second supporting structure of the underwater deep foundation deformation monitoring system of the embodiment of the present application;

[0026] Figure 4Figure 1 is a partial schematic view of a first supporting structure, a second supporting structure, and a fixed connecting part of an underwater deep foundation deformation monitoring system according to an embodiment of the present application;

[0027] Figure 5 Figure 2 is a partial schematic view of a first supporting structure, a second supporting structure, and a deformation detecting part of an underwater deep foundation deformation monitoring system according to an embodiment of the present application;

[0028] Figure 6 Figure 3 is a structural schematic view of a deformation detecting part of an underwater deep foundation deformation monitoring system according to an embodiment of the present application;

[0029] Figure 7 Figure 4 is a position schematic view of a fixed connecting part and a deformation detecting part after a first supporting structure of an underwater deep foundation deformation monitoring system according to an embodiment of the present application is unfolded;

[0030] Figure 8 Figure 5 is a partial schematic view of a first supporting structure, a second supporting structure, a fixed connecting part, and a water leakage detecting part of an underwater deep foundation deformation monitoring system according to an embodiment of the present application;

[0031] Figure 9 Figure 6 is a position schematic view of a fixed connecting part and a water leakage detecting part after a first supporting structure of an underwater deep foundation deformation monitoring system according to an embodiment of the present application is unfolded;

[0032] Figure 10 Figure 7 is a flow schematic view of an underwater deep foundation deformation monitoring method according to an embodiment of the present application.

[0033] Reference signs:

[0034] 1. first supporting structure;

[0035] 2. second supporting structure;

[0036] 3. fixed connecting part; 31. fixed connecting member; 32. fastener;

[0037] 4. deformation detecting part; 41. detecting rod; 42. strain sensor; 43. mounting part;

[0038] 5. water leakage detecting part. DETAILED DESCRIPTION

[0039] The preferred embodiments of the present application will be described in detail below with reference to the drawings, wherein the drawings constitute a part of the present application and serve to explain the principles of the embodiments of the present application, but are not used to limit the scope of the present application.

[0040] In the description of the embodiments of the present application, it should be noted that unless otherwise clearly specified and limited, the term "connected" should be interpreted in a broad manner, for example, it can be fixedly connected, or detachably connected, or integrally connected, which can be mechanically connected, or electrically connected, which can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above-mentioned term in the present application can be understood according to the specific circumstances.

[0041] The terms "top", "bottom", "above", "under" and "on" used throughout the description are relative positions of the components of the device, for example, the relative positions of the top and bottom substrates inside the device. It can be understood that the device is multifunctional, regardless of their orientation in space.

[0042] In view of the difficulty of the existing foundation pit deformation monitoring system to meet the monitoring needs of underwater deep foundation pit, the applicant proposes an underwater deep foundation pit deformation monitoring system and a monitoring method. The underwater deep foundation pit deformation monitoring system comprises a first supporting structure, a second supporting structure, a plurality of fixed connecting parts, a plurality of deformation detection parts and a plurality of water leakage detection parts. The first supporting structure and the second supporting structure are sleeved, the first supporting structure is in contact with the inner wall of the deep foundation pit to support the deep foundation pit, and the inner part of the second supporting structure surrounds a space that can be used to pour a supporting column of a water building. The fixed connecting part can connect the first supporting structure and the second supporting structure into a whole, thereby improving the stability of the first supporting structure and the second supporting structure. The deformation detection part is arranged between the first supporting structure and the second supporting structure, when the inner wall rock-soil of the underwater deep foundation pit exerts a force on the first supporting structure and causes the first supporting structure to produce a slight deformation, the detection rod of the deformation detection part will produce a stress-strain change and be detected by the strain sensor, which can be used to judge the deformation amount of the first supporting structure at each place, if the deformation amount of the first supporting structure at a certain place is greater than the critical deformation amount, it represents that the deformation of the first supporting structure is too large, and the hole wall deformation of the underwater deep foundation pit is too large. The water leakage detection part is arranged on the inner side of the first supporting structure, and the water leakage detection part is arranged on the inner side of the first supporting structure. The vibration of the first supporting structure is detected to determine whether the first supporting structure leaks. The underwater deep foundation pit deformation monitoring system of the present application can combine the detection results of the deformation detection part and the detection results of the water leakage detection part, and comprehensively judge the deformation degree of the first supporting structure, so as to more accurately judge the deformation of the underwater deep foundation pit and the risk caused by the deformation.

[0043] Figure 1 It is a structural schematic diagram of the underwater deep foundation pit deformation monitoring system of the present application. Figure 2 It is another structural schematic diagram of the underwater deep foundation pit deformation monitoring system of the present application. Figure 3 It is a structural schematic diagram of the first supporting structure and the second supporting structure of the underwater deep foundation pit deformation monitoring system of the present application. Figure 4It is a local schematic view of the first supporting structure, the second supporting structure and the fixed connecting part of the underwater deep foundation pit deformation monitoring system of the embodiment of the application. Figure 5 It is a local schematic view of the first supporting structure, the second supporting structure and the deformation detection part of the underwater deep foundation pit deformation monitoring system of the embodiment of the application. Figure 6 It is a structural schematic view of the deformation detection part of the underwater deep foundation pit deformation monitoring system of the embodiment of the application. Figure 7 It is a position schematic view of the fixed connecting part and the deformation detection part after the first supporting structure of the underwater deep foundation pit deformation monitoring system of the embodiment of the application is unfolded. Figure 8 It is a local schematic view of the first supporting structure, the second supporting structure, the fixed connecting part and the water leakage detection part of the underwater deep foundation pit deformation monitoring system of the embodiment of the application. Figure 9 It is a position schematic view of the fixed connecting part and the water leakage detection part after the first supporting structure of the underwater deep foundation pit deformation monitoring system of the embodiment of the application is unfolded.

[0044] Please refer to Figures 1 to 9 , the embodiment of the application provides a kind of underwater deep foundation pit deformation monitoring system, including first supporting structure 1, second supporting structure 2, multiple fixed connecting parts 3, multiple deformation detection parts 4 and multiple water leakage detection parts 5;Wherein, first supporting structure 1 is inserted into underwater deep foundation pit, and the outer side wall of first supporting structure 1 is connected with the inner wall of underwater deep foundation pit;First supporting structure 1 is sleeved in the outer side of second supporting structure 2, and gap is provided between first supporting structure 1 and second supporting structure 2;Multiple fixed connecting parts 3 are arranged between first supporting structure 1 and second supporting structure 2, and are fixedly connected with first supporting structure 1 and second supporting structure 2;Multiple deformation detection parts 4 are arranged between first supporting structure 1 and second supporting structure 2, and deformation detection part 4 includes detection rod 41 and strain sensor 42, and the inner wall of first supporting structure 1 is connected with the end along the axial direction of detection rod 41, and the other end is connected with the outer wall of second supporting structure 2, and the outer wall of detection rod 41 is provided with multiple strain sensors 42 along the circumferential direction of itself;Multiple water leakage detection parts 5 are arranged on the inner side of first supporting structure 1, and water leakage detection part 5 includes vibration sensor, and vibration sensor is used to detect the vibration of the inner side of first supporting structure 1.

[0045] Please refer to Figure 1 and Figure 2The underwater deep foundation pit deformation monitoring system of the embodiment of the present application supports the underwater deep foundation pit through the sleeved first supporting structure 1 and the second supporting structure 2, and reflects the structural stability of the underwater deep foundation pit through the detection of the supporting structure by the deformation detection part 4 and the water leakage detection part 5. When the underwater deep foundation pit deformation monitoring system of the embodiment of the present application is used, the underwater deep foundation pit has been excavated, and before the support structure (for example, a reinforced concrete support column) of the overwater building (for example, a bridge, a drilling platform, etc.) is built in the underwater deep foundation pit, the underwater deep foundation pit deformation monitoring system of the embodiment of the present application is used to support the underwater deep foundation pit, and the deformation and water leakage of the first supporting structure 1 are monitored in real time to determine whether the underwater deep foundation pit has the risk of deformation or even damage.

[0046] The first supporting structure 1 is arranged in the underwater deep pit, the outer wall of the first supporting structure 1 is in contact with the inner wall of the underwater deep foundation pit, and the inner wall of the underwater deep foundation pit is supported. The axis of the first supporting structure 1 coincides with the axis of the underwater deep foundation pit, and can be regarded as a straight line, so the first supporting structure 1 can be regarded as a cylinder. It can be understood that when the cofferdam is used to excavate the underwater deep foundation pit, the first supporting structure 1 is above the ground surface under water, and the relationship with the water surface is not limited; when the underwater excavation is used to excavate the underwater deep foundation pit, the first supporting structure 1 extends above the water surface, and needs to prevent water from entering the inside of the first supporting structure 1. The first supporting structure 1 should have sufficient structural strength to withstand the applied force of the water-rich rock-soil around the underwater deep foundation pit and the water pressure.

[0047] The second supporting structure 2 is cylindrical, coaxially sleeved in the inside of the first supporting structure 1, and a circular annular space is formed between the second supporting structure 2 and the first supporting structure 1. The support structure of the overwater building is built in the inside of the second supporting structure 2. The first supporting structure 1 and the second supporting structure 2 are fixedly connected into an integral whole through the plurality of fixed connection parts 3, so that the first supporting structure 1 and the second supporting structure 2 can have sufficient structural strength. The first supporting structure 1 and the second supporting structure 2 leave a gap, which is a circular annular space, and the fixed connection part 3 is arranged in the gap.

[0048] Since the second supporting structure 2 is not directly connected with the inner wall of the underwater deep foundation pit, when the first supporting structure 1 deforms, the second supporting structure 2 will not obviously deform. The deformation detection parts 4 are arranged in the gap between the first supporting structure 1 and the second supporting structure 2. The detection rod 41 of the deformation detection part 4 is connected with the inner wall of the first supporting structure 1 at one end along the axial direction of the detection rod 41, and connected with the outer wall of the second supporting structure 2 at the other end. Therefore, when the first supporting structure 1 deforms and the second supporting structure 2 does not obviously deform, the detection rod 41 will also deform. The strain sensor 42 of the deformation detection part 4 is arranged on the outer wall of the detection rod 41. The deformation amount of the detection rod 41 can be obtained through the strain sensor 42, so as to reflect the deformation amount of the first supporting structure 1 corresponding to the deformation detection part 4. Therefore, the deformation amount of the first supporting structure 1 can be reflected through the plurality of deformation detection parts 4. According to whether the deformation of the first supporting structure 1 exceeds the critical deformation amount, it can be judged whether the deformation of the underwater deep foundation pit is at risk. It should be emphasized that the fixed connection part 3 can also deform, but the fixed connection part 3 should be made of a material with high structural strength, so as to improve the structural strength of the whole formed by the first supporting structure 1 and the second supporting structure 2.

[0049] It can be understood that, in the case that the underwater deep foundation pit does not obviously deform, the first supporting structure 1 will deform, but the deformation is not obvious enough to be perceived by the naked eye. Therefore, the deformation of the first supporting structure 1 will not cause damage to the first supporting structure 1.

[0050] The vibration sensor of the water leakage detection part 5 is arranged on the inner side of the first support structure 1. When the first support structure 1 has a leakage point under the action of rock-soil or water pressure, because the rock-soil around the deep foundation pit under water is below the water surface, water in the rock-soil will continuously seep out from the leakage point and generate regular sound signals (vibration signals), and the detection result of the vibration sensor will contain the regular sound signals caused by the water seepage, so as to determine whether the first support structure 1 leaks water. Considering that the sound signals attenuate when propagating along the first support structure 1, the position of the leakage point can be determined according to the strength of the sound signals in the detection results of the plurality of water leakage detection parts 5. When the position of the leakage point does not coincide with the position of the excessive deformation of the first support structure 1, the position of the leakage point represents that the material of the first support structure 1 has a micro-defect, but the deep foundation pit under water does not necessarily have a risk of excessive deformation, which can be alleviated by maintaining the first support structure 1. The position of the excessive deformation of the first support structure 1 represents that the deformation of the first support structure 1 has not caused micro-damage of the structure, and the deep foundation pit under water has a high risk of excessive deformation, which can be alleviated by maintaining the deep foundation pit under water and the first support structure 1. When the position of the leakage point coincides with the position of the excessive deformation of the first support structure 1 (there can be a reasonable error), it represents that the deformation of the first support structure 1 causes micro-damage of the structure, and the deep foundation pit under water has a very high risk of excessive deformation, which is difficult to alleviate by maintaining the deep foundation pit under water and the first support structure 1. It can be understood that the deformation detection part 4 and the water leakage detection part 5 can transmit signals in a wired signal or a wireless signal.

[0051] The deformation monitoring system of the deep foundation pit under water can monitor the deformation of the first support structure 1 through the deformation detection part 4, monitor the water leakage of the first support structure 1 through the water leakage detection part 5, and comprehensively determine the state of the deep foundation pit under water and the maintenance risk according to the deformation and the water leakage.

[0052] Further, referring to Figures 1 to 3 In the plane perpendicular to the axial direction of the first support structure 1, the cross-sectional shape of the first support structure 1 is the same as that of the second support structure 2, and the distance between the inner wall of the first support structure 1 and the outer wall of the second support structure 2 is equal everywhere.

[0053] In the plane perpendicular to the axial direction of the first support structure 1, the cross-sectional shape of the first support structure 1 can form a concentric ring with the cross-sectional shape of the second support structure 2. Because the distance between the inner wall of the first support structure 1 and the outer wall of the second support structure 2 is equal everywhere, the initial states of the plurality of deformation detection parts 4 are basically the same, and the tensile strain and the compressive strain of the strain sensor 42 can correspond to the positive and negative of the deformation amount (stretching of the deformation) respectively, so that the calculation of the deformation amount of each position of the first support structure 1 can be simplified.

[0054] Further, referring to Figures 1 to 3In the plane perpendicular to the axial direction of the first support structure 1, the cross-sectional shape of the first support structure 1 is circular, elliptical or polygonal, so that the first support structure 1 and the second support structure 2 can withstand greater force.

[0055] Further, referring to Figure 4 , the plurality of fixed connection parts 3 include a plurality of connecting piece groups, and the connecting piece groups are equidistantly arranged along the axial direction of the first support structure 1; the connecting piece group includes a plurality of fixed connecting pieces 31 and a plurality of fasteners 32, the fixed connecting piece 31 is threadedly connected to the threaded hole of the inner wall of the first support structure 1 at one end along the circumferential direction of the fixed connecting piece 31, the other end of the fixed connecting piece 31 passes through the second support structure 2 and is threadedly connected with the fastener 32, and the fastener 32 abuts against the inner wall of the second support structure 2.

[0056] The plurality of connecting piece groups are equidistantly arranged along the axial direction of the first support structure 1, so that a single connecting piece group can connect the corresponding one end of the first support structure 1 and the second support structure 2 together, thereby improving the connection strength of the first support structure 1 and the second support structure 2.

[0057] The fixed connecting piece 31 can be in the form of a bolt, and during installation, the fixed connecting piece 31 passes through the second support structure 2 until the one end of the fixed connecting piece 31 is connected to the threaded blind hole of the inner wall of the first support structure 1, and the other end is threadedly connected with the fastener 32, and the fastener 32 abuts against the second support structure 2, so that the second support structure 2 is in the trend of being close to the first support structure 1.

[0058] Further, the plurality of fixed connecting pieces 31 in each connecting piece group are arranged locally along the circumferential direction of the first support structure 1; and in the plurality of connecting piece groups, the plurality of fixed connecting pieces 31 of at least two connecting piece groups are arranged at the same position along the circumferential direction of the first support structure 1.

[0059] Under the premise that the second support structure 2 is in the trend of being close to the first support structure 1, the plurality of fixed connecting pieces 31 of each connecting piece group are arranged uniformly along the circumferential direction of the first support structure 1, so that the first support structure 1 and the second support structure 2 can fix the relative position through the fixed connection part 3.

[0060] In the plurality of connecting piece groups, the plurality of fixed connecting pieces 31 of at least two connecting piece groups are arranged at the same position along the circumferential direction of the first support structure 1, and when the first support structure 1 is unfolded into a plane, the connection between the plurality of fixed connecting pieces 31 and the first support structure 1 can be regarded as an array arrangement, thereby further improving the structural strength of the connection between the first support structure 1 and the second support structure 2.

[0061] Further, referring to Figure 5 and Figure 6, the first supporting structure 1 is provided with a mounting through hole; the deformation detection part 4 further comprises a mounting part 43, the mounting part 43 is fixedly connected with the mounting through hole; the mounting part 43 is provided with a first abutting hole; the inner wall of the second supporting structure 2 is provided with a second abutting hole; the detection rod 41 is provided with an abutting pin at both ends along the axial direction of the detection rod 41, and the abutting pins are respectively inserted into the first abutting hole and the second abutting hole; the detection rod 41 abuts with the mounting part 43 and the second supporting structure 2.

[0062] When the deformation detection part 4 is installed, the detection rod 41 passes through the mounting through hole of the first supporting structure 1 until the abutting pin at one end of the detection rod 41 is inserted into the second abutting hole, and then the abutting pin at the other end of the detection rod 41 is inserted into the first abutting hole of the mounting part 43, and at the same time, the mounting part 43 is fixedly installed in the mounting through hole of the first supporting structure 1; at this time, one end of the detection rod 41 abuts with the second supporting structure 2, and the other end abuts with the mounting part 43; since the mounting part 43 is fixedly connected with the first supporting structure 1, the other end of the detection rod 41 abuts with the first supporting structure 1, so that the deformation of the detection rod 41 can reflect the deformation difference between the first supporting structure 1 and the second supporting structure 2. Exemplarily, the mounting through hole and the mounting part 43 can be fixedly connected in the form of threaded connection.

[0063] Further, referring to Figure 5 and Figure 6, the cross-sectional shape of the deformation detection part 4 in the plane perpendicular to the axial direction of the first support structure 1 is a square, and one pair of opposite sides of the square corresponds to the outer wall perpendicular to the axial direction of the first support structure 1, and the other pair of opposite sides corresponds to the outer wall parallel to the axial direction of the first support structure 1. For ease of understanding, the outer wall corresponding to one pair of opposite sides of the square perpendicular to the axial direction of the first support structure 1 is referred to as the first outer wall pair, and the outer wall corresponding to the other pair of opposite sides of the square parallel to the axial direction of the first support structure 1 is referred to as the second outer wall pair. The detection results of the strain sensors 42 on the detection rod 41 include but are not limited to the following states. When both strain sensors 42 of the first outer wall pair detect tensile strain or compressive strain, and both strain sensors 42 of the second outer wall pair detect tensile strain or compressive strain, the detection rod 41 is in a tensile or compressive state, indicating that the first support structure 1 at the corresponding position is moving towards or away from the second support structure 2 along the axial direction of the detection rod 41. When the two strain sensors 42 of the first outer wall pair detect tensile strain and compressive strain respectively, and both strain sensors 42 of the second outer wall pair detect tensile strain or compressive strain, the detection rod 41 is in a bending state along the axial direction of the first support structure 1, indicating that the first support structure 1 at the corresponding position is dislocated along its own axial direction. When both strain sensors 42 of the first outer wall pair detect tensile strain or compressive strain, and the two strain sensors 42 of the second outer wall pair detect tensile strain and compressive strain respectively, the detection rod 41 is in a bending state perpendicular to the axial direction of the first support structure 1, indicating that the first support structure 1 at the corresponding position is dislocated perpendicular to its own axial direction. It can be understood that the above states can be superimposed on each other.

[0064] Therefore, a certain deformation detection part can obtain the deformation state of the first support structure 1 at the corresponding position. Multiple deformation detection parts 4 can obtain the deformation state of the first support structure 1 at each position. It can be understood that the first support structure 1 can be regarded as an elastic structure, and according to the deformation amount of the first support structure 1 at several positions, combined with the basic principles of material mechanics, the deformation amount of the first support structure 1 at each position in the region formed by the several positions can be calculated, and the specific calculation process is not described here.

[0065] Further, referring to Figure 7 , the plurality of deformation detection parts 4 includes a plurality of detection part groups, and the plurality of detection part groups are equidistantly arranged along the axial direction of the first support structure 1; each detection part group includes a plurality of detection rods 41; and the geodesic distance between each detection rod 41 and the plurality of fixed connection parts 3 on the inner wall of the first support structure 1 has a minimum value, and the geodesic distance between at least two fixed connection parts 3 and the detection rod 41 is equal to the minimum value.

[0066] The plurality of detection part groups are equidistantly arranged along the axial direction of the first support structure 1, so that a single detection part group can detect the deformation amount of the first support structure 1 at the corresponding position, thereby improving the reliability of the detection results.

[0067] It should be noted that for two points on the curved surface or the folded surface of a certain space, the distance corresponding to the two points when they are unfolded into a plane is the geodesic distance. The geodesic distance between each detection rod 41 and the plurality of fixed connecting parts 3 has a minimum value along the inner wall of the first supporting structure 1, and the geodesic distance between at least two fixed connecting parts 3 and the detection rod 41 is equal to the minimum value. Therefore, for a certain detection rod 41, there are a plurality of nearest fixed connecting parts 3. In order to ensure the stability of the connection between the first supporting structure 1 and the second supporting structure 2, the material of the fixed connecting part 3 has higher structural strength compared with the material of the detection rod 41. Considering that the high-strength fixed connecting part 3 may affect the deformation of the detection rod 41, the detection rod 41 should be appropriately away from the fixed connecting part 3, so for a certain detection rod 41, there are a plurality of nearest fixed connecting parts 3, that is, the geodesic distance between each detection rod 41 and the plurality of fixed connecting parts 3 has a minimum value, and the geodesic distance between at least two fixed connecting parts 3 and the detection rod 41 is equal to the minimum value.

[0068] Further, the underwater deep foundation pit deformation monitoring system further comprises a water pumping assembly for pumping out water in the gap between the first supporting structure 1 and the second supporting structure 2. Water in the rock-soil around the underwater deep foundation pit may seep into the annular space between the first supporting structure 1 and the second supporting structure 2 from the bottom of the underwater deep foundation pit, and when the first supporting structure 1 has a leakage point, water in the rock-soil around the underwater deep foundation pit may also seep into the annular space between the first supporting structure 1 and the second supporting structure 2 from the leakage point, thereby affecting the conduction of the sound signal along the first supporting structure 1. The water pumping assembly can pump out the water seeping into the annular space between the first supporting structure 1 and the second supporting structure 2, so as to reduce the influence of the seepage water on the detection result of the water leakage detection part 5.

[0069] Further, referring to Figure 8 and Figure 9 , the geodesic distance between each water leakage detection part 5 and the plurality of fixed connecting parts 3 has a minimum value along the inner wall of the first supporting structure 1, and the geodesic distance between at least four fixed connecting parts 3 and the plurality of water leakage detection parts 5 is equal to the minimum value, so that the water leakage detection part 5 is located between at least four fixed connecting parts 3. Since the fixed connecting part 3 is fixedly connected to the first supporting structure 1 and the second supporting structure 2 at both ends, the fixed connecting part 3 may affect the conduction of the sound signal along the first supporting structure 1, so that the water leakage detection part 5 is appropriately away from the fixed connecting part 3, which can improve the detection accuracy of the water leakage detection part 5.

[0070] In a second aspect, the embodiments of the present application also provide a method for monitoring the deformation of an underwater deep foundation pit, which uses the monitoring system for the deformation of an underwater deep foundation pit in the foregoing embodiments of the present application to monitor the deformation of the underwater deep foundation pit.

[0071] Figure 10 Fig. 1 is a flowchart of a method for monitoring deformation of a deep underwater foundation pit according to an embodiment of the present application.

[0072] Fig. 1 is a flowchart of a method for monitoring deformation of a deep underwater foundation pit according to an embodiment of the present application. Figure 10 The method for monitoring deformation of a deep underwater foundation pit according to an embodiment of the present application comprises the following steps:

[0073] S1, deformation detection.

[0074] The deformation of each detection rod 41 is obtained by the plurality of strain sensors 42 of each deformation detection unit 4, and the deformation of the corresponding position of the first supporting structure 1 is obtained.

[0075] S2, obtaining deformation at each position.

[0076] According to the deformation of each detection rod 41, the deformation at each position of the first supporting structure 1 is obtained. The first supporting structure 1 can be regarded as an elastic structure. According to the deformation of several positions of the first supporting structure 1, and combining the basic principles of material mechanics, the deformation of each position of the first supporting structure 1 in the region formed by the several positions can be calculated. Therefore, the deformation at each position of the first supporting structure 1 can be obtained according to the deformation of each detection rod 41. The specific calculation process is not described here.

[0077] S3, water leakage detection.

[0078] According to the water leakage detection unit 5, it is detected whether there is water leakage at each position of the first supporting structure 1. Water will seep out from the leakage point and produce regular sound signals (vibration signals). The results detected by the vibration sensor will contain regular sound signals caused by water seepage, so as to judge whether the first supporting structure 1 leaks. Considering that the sound signal propagates along the first supporting structure 1 and attenuates, the position of the leakage point can be judged according to the strength of the sound signal in the detection results of the plurality of water leakage detection units 5.

[0079] When the deformation at a certain position of the first supporting structure 1 is greater than or equal to the critical deformation, it is considered that the deformation at the position is too large. Otherwise, it is considered that the deformation of the first supporting structure 1 is within the allowable range.

[0080] When the leakage point position does not coincide with the excessive deformation position of the first supporting structure 1, the leakage point position represents that there is a micro-defect in the material of the first supporting structure 1, but the underwater deep foundation pit does not necessarily have the risk of excessive deformation, which can be alleviated by maintaining the first supporting structure 1, and the excessive deformation position of the first supporting structure 1 represents that the deformation of the first supporting structure 1 has not caused micro-damage to the structure, and the underwater deep foundation pit has a high risk of excessive deformation, which can be alleviated by maintaining the underwater deep foundation pit and the first supporting structure 1; when the leakage point position coincides with the excessive deformation position of the first supporting structure 1 (there can be a reasonable error), it represents that the deformation of the first supporting structure 1 causes micro-damage to the structure, and the underwater deep foundation pit has a very high risk of excessive deformation, which is difficult to alleviate by maintaining the underwater deep foundation pit and the first supporting structure 1.

[0081] In summary, the embodiment of the present application provides a kind of underwater deep foundation pit deformation monitoring system and monitoring method. Underwater deep foundation pit deformation monitoring system includes first supporting structure, second supporting structure, multiple fixed connections, multiple deformation detection parts and multiple water leakage detection parts. First supporting structure and second supporting structure are set, first supporting structure is in contact with the inner wall of deep foundation pit, to support deep foundation pit, the space that the inside of second supporting structure is enclosed can be used to pour the space of support column of building on water. Fixed connection can connect first supporting structure and second supporting structure into a whole, to improve the stability of first supporting structure and second supporting structure. Deformation detection part is arranged between first supporting structure and second supporting structure, when the inner wall rock-soil of underwater deep foundation pit exerts force to first supporting structure, and make first supporting structure produce slight deformation, the detection rod of deformation detection part will produce stress and strain change, and be detected by strain sensor, can be used to judge the deformation amount of first supporting structure everywhere, if the deformation amount of first supporting structure somewhere is greater than critical deformation amount, it represents that the deformation of first supporting structure is too large, and the hole wall deformation of underwater deep foundation pit is too large. Water leakage detection part is arranged on the inner side of first supporting structure, and whether first supporting structure exists water leakage is judged by detecting the inner side vibration of first supporting structure. The underwater deep foundation pit deformation monitoring system and monitoring method of the embodiment of the present application can be combined with the detection results of deformation detection part and the detection results of water leakage detection part, and the deformation degree of first supporting structure is comprehensively judged, to more accurately judge the deformation of underwater deep foundation pit and the risk generated by deformation. Since underwater deep foundation pit deformation and water leakage monitoring is the key link to ensure engineering safety and quality, the present application can capture dynamic changes by continuous deformation and water leakage real-time monitoring, and potential problems can be found and handled in time, to help engineers adjust construction scheme in time, and avoid serious consequences such as foundation pit collapse and building damage caused by excessive deformation or water leakage. At the same time, monitoring data can also be used to establish an early warning system to predict risks in advance, so as to take corresponding protective measures.

[0082] The above description is only the preferred embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. An underwater deep foundation pit deformation monitoring system, characterized in that, The utility model relates to a kind of underwater deep foundation pit support structures, including: First support structure, extend into underwater deep foundation pit, the outer wall of the first support structure is connected with the inner wall of the underwater deep foundation pit; Second support structure, the first support structure is sleeved in the outer side of the second support structure, and gap is provided between the first support structure and the second support structure; Multiple fixed connection parts are provided between the first support structure and the second support structure, and are fixedly connected with the first support structure and the second support structure; Multiple deformation detection parts are provided between the first support structure and the second support structure, and the deformation detection part includes a detection rod and a strain sensor, one end of the detection rod along its axial direction is connected with the inner wall of the first support structure, the other end is connected with the outer wall of the second support structure, and the outer wall of the detection rod is provided with multiple strain sensors along its circumferential direction;The deformation detection part is used to monitor the deformation of the first support structure; Multiple water leakage detection parts are provided on the inner side of the first support structure, and the water leakage detection part includes a vibration sensor, which is used to detect the vibration of the inner side of the first support structure;The water leakage detection part is used to monitor whether the first support structure leaks water into the gap between the first support structure and the second support structure; Water pumping assembly, the water pumping assembly is used to pump out the water in the gap between the first support structure and the second support structure.

2. The underwater deep foundation pit deformation monitoring system according to claim 1, characterized in that, In the plane perpendicular to the axial direction of the first support structure, the cross-sectional shape of the first support structure is the same as that of the second support structure.

3. The underwater deep foundation pit deformation monitoring system according to claim 1, characterized in that, In the plane perpendicular to the axial direction of the first support structure, the cross-sectional shape of the first support structure is circular, elliptical or polygonal.

4. The underwater deep foundation pit deformation monitoring system according to claim 1, characterized in that, Multiple fixed connection parts include multiple connector groups, which are equidistantly arranged along the axial direction of the first support structure; The connector group includes multiple fixed connectors and multiple fasteners, one end of the fixed connector along its circumferential direction is threadedly connected with the threaded hole of the inner wall of the first support structure, the other end of the fixed connector passes through the second support structure and is threadedly connected with the fastener, and the fastener abuts against the inner wall of the second support structure.

5. The underwater deep foundation pit deformation monitoring system according to claim 4, characterized in that, Multiple fixed connectors in each connector group are arranged locally along the circumferential direction of the first support structure. In multiple connector groups, the positions of multiple fixed connectors in at least two connector groups along the circumferential direction of the first support structure are the same.

6. The underwater deep foundation pit deformation monitoring system according to claim 1, characterized in that, The first support structure is provided with a mounting through hole; The deformation detection part further includes a mounting part, which is fixedly connected with the mounting through hole;The mounting part is provided with a first abutting hole; The inner wall of the second support structure is provided with a second abutting hole; Both ends of the detection rod along its axial direction are provided with abutting pins, which are respectively inserted into the first abutting hole and the second abutting hole, and the detection rod abuts against the mounting part and the second support structure.

7. The underwater deep foundation pit deformation monitoring system according to claim 6, characterized in that, The cross-sectional shape of the deformation detection part in the plane perpendicular to its axial direction is square, and the outer walls corresponding to one pair of opposite sides of the square are perpendicular to the axial direction of the first support structure, and the outer walls corresponding to the other pair of opposite sides are parallel to the axial direction of the first support structure.

8. The underwater deep foundation pit deformation monitoring system according to claim 6, characterized in that, The plurality of deformation detection parts comprise a plurality of detection part groups, and the plurality of detection part groups are equidistantly arranged along the axial direction of the first support structure; Each of the detection part groups comprises a plurality of detection rods, and the geodesic distance between each of the detection rods and the plurality of fixed connection parts has a minimum value on the inner wall of the first support structure, and the geodesic distance between at least two of the fixed connection parts and the detection rod is equal to the minimum value.

9. A method of monitoring deformation of an underwater deep foundation pit, characterized by, The monitoring method comprises: obtaining the deformation amount of each detection rod through the plurality of strain sensors of each deformation detection part; obtaining the deformation amount of each part of the first support structure according to the deformation amount of each detection rod; detecting whether there is water leakage at each part of the first support structure according to the water leakage detection part; when there is water leakage at a certain part of the first support structure, or the total deformation amount at a certain part is greater than a critical deformation amount, the underwater deep foundation has a deformation risk.

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