Method for testing sealing performance of steel open caisson structure

Abstract

The invention discloses a method for testing the sealing performance of a steel open caisson structure. The method comprises the following steps: step 1, dividing a bay of a steel open caisson into a plurality of mutually sealed subareas; the bottoms of the compartments in the same partition are communicated; each partition is provided with at least one water injection compartment, and plugging plates are arranged in the other compartments; 2, a water injection and drainage system and a water level monitoring system are arranged; 3, water is injected into the dock to reach the floating-assisting height, and the sealing performance of the floating-assisting plate is checked; 4, water is injected into the water injection compartments of the first batch of partitions to a first height, and the sealing performance of the plugging plates is detected; step 5, injecting water into the first batch of subareas to a second height, and checking the structural sealing performance of the batch of subareas; sixthly, according to the fourth step and the fifth step, sealing performance testing is conducted on the partitions of the remaining batches; and step 7, after the inspection is completed, discharging water in all the subareas. According to the method, the inspection mode that water is injected into the open caisson steel shell in batches is adopted, and the efficient, convenient, comprehensive, accurate, safe and reliable inspection effect is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of caisson construction, and in particular to a method for testing the sealing performance of a steel caisson structure. Background Art

[0002] The steel shell of the caisson is usually assembled in the dock. After the assembly is completed, it needs to be inspected for sealing. Only after passing the inspection can it be undocking, floating, positioning and water filling and sinking. The purpose of sealing inspection of steel caisson is as follows: to ensure that the steel shell of the caisson does not leak during the floating process, to ensure the safety of floating; to ensure that there is no leakage between the wall and compartment partition of the steel shell of the caisson, to facilitate the adjustment of the posture when the caisson is filled with water and sinking, and to ensure the accuracy of the lowering.

[0003] At present, the main methods for testing the sealing of steel caissons are: weld appearance inspection, ultrasonic non-destructive testing and kerosene penetration testing. They still have the following technical problems: (1) The steel shell of the caisson is manufactured in sections and then assembled as a whole, with a large number of welds. The above methods are prone to missed inspections; (2) The steel shell of the caisson has a complex structure, with many components in the wall and compartments, making it difficult for personnel to enter for inspection; (3) The light inside the caisson is dark, and the accuracy of crack inspection by naked eye is low; (4) The above methods cannot accurately simulate the sealing of the steel shell of the caisson under actual water pressure; (5) The buoyancy plate at the bottom of the caisson is connected to the steel shell of the caisson by bolts, and a rubber strip is sealed between the two to stop water. The above methods are not suitable for the sealing inspection of this structure; (6) The above methods require a lot of manpower and time, and the cost of ultrasonic non-destructive testing and kerosene penetration testing is high; (7) In particular, after the kerosene penetration test is completed, the residue needs to be cleaned up, and the process is complicated. Summary of the invention

[0004] The main technical problem to be solved by the present invention is to provide a method for inspecting the sealing performance of a steel caisson structure, so as to achieve an efficient, convenient, comprehensive, accurate, safe and reliable inspection effect.

[0005] In order to solve the above technical problems, the present invention provides a method for testing the sealing of a steel caisson structure. In terms of structure: the main body of the steel caisson is a caisson steel shell; the caisson steel shell is constructed of a plurality of compartments; the steel caisson also includes a floating plate sealed and connected to the bottom of the caisson steel shell;

[0006] The method comprises the following steps:

[0007] Step 1: Divide the compartment into a plurality of symmetrically distributed partitions; any two adjacent partitions are sealed, and the compartments in the same partition are connected to each other at the bottom;

[0008] For any partition, at least one compartment is provided with full height to serve as a water-filled compartment, and the remaining compartments are provided with blocking plates;

[0009] Further, the partitions are divided into several batches according to the water injection sequence;

[0010] Step 2: Lay out water injection and drainage systems, and water level monitoring systems;

[0011] The water injection and drainage system includes at least two water injection pumps and a drainage pump; the water injection pump is arranged outside the steel caisson and injects water into the partition through an external water pipe; the drainage pump is arranged at the bottom of the water injection compartment of each partition;

[0012] The water level monitoring system includes a plurality of water level gauges and a monitoring host; the water level gauges are arranged at the bottom of the partitions and feed back the water level monitoring data to the monitoring host;

[0013] Step 3: Fill the dock with water to the buoyancy aid height, and check the sealing of the buoyancy aid plate; the buoyancy aid height is not lower than the setting height of the buoyancy aid plate;

[0014] Step 4: Use the water injection pump to inject water into the water injection compartment of the first batch of partitions; when the water level in the water injection compartment is stabilized at a first height, observe whether there is water bubbling upwards on each blocking plate in the first batch of partitions; the first height is higher than the setting height of the blocking plate;

[0015] Step 5: Continue to inject water into the first batch of partitions to a second height to test the structural sealing of the batch of partitions; the second height is the maximum water injection height that does not damage the safety of the steel caisson structure;

[0016] The inspection of the sealing of the partition structure includes: visually observing whether the wall and compartment of the steel caisson are leaking water, and then continuously monitoring the water level change in the partition with the help of the water level monitoring system; if the water level monitoring data is abnormal, it is necessary to manually check the leakage point;

[0017] Step 6: Refer to Step 4 and Step 5 to perform water filling and sealing tests on the remaining batches of partitions;

[0018] Step 7: After the inspection is completed, use the drainage pump to drain the water in all partitions to provide a dry working environment for the repair work.

[0019] In a preferred embodiment, the step 3 further comprises:

[0020] When the water filling height in the dock reaches a third height, the cavity that may exist at the bottom of the buoyant board is discharged through a water filling valve installed on the top of the buoyant board;

[0021] The third height is not lower than the height of the blade foot at the bottom of the steel caisson and is lower than the buoyancy aid height.

[0022] In a preferred embodiment, the partitions of the same batch are symmetrical about the center point of the steel caisson.

[0023] In a preferred embodiment, the water injection method in step 5 is: water is injected into each compartment in the first batch partition respectively.

[0024] In a preferred embodiment, the water injection method in step 5 is: pre-arranging a connecting hole on the bulkhead of the water injection compartment; the position of the connecting hole is higher than the blocking plate; continuing to inject water into the water injection compartment to cover the connecting hole, and also realizing water injection into the compartments in the same area.

[0025] In a preferred embodiment, in step 3, the value of the buoyancy aid height is not greater than the draft of the steel caisson in the bottom-sealed state, and is within 1.0 meter of the latter.

[0026] In a preferred embodiment, in step 2, one water level gauge is provided in each of the compartments.

[0027] In a preferred embodiment, in step 2, the external water pipe is a steel pipe;

[0028] A plurality of temporary fixing frames are arranged at intervals along the height direction on the outer wall of the steel caisson to support the external water pipe in sections.

[0029] In a preferred embodiment, the partition includes three or four of the compartments.

[0030] In a preferred embodiment, the water injection pump is a permanent magnet pump, and the drainage pump is a high-lift water pump.

[0031] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0032] (1) The method creatively uses the method of batch water injection to test the sealing of steel caissons, which can not only realize the batch inspection of large-scale weld quality, but also effectively solve the problem of missed inspection in the prior art, reflecting the comprehensiveness. Moreover, in this way, the defects of the weld can be visualized, which is convenient for inspection personnel to find and identify, making the inspection work more convenient and efficient.

[0033] (2) The method injects high water level into the steel shell of the dock and caisson, accurately simulating the water pressure to which the steel caisson is subjected during operation. Therefore, the method can scientifically and objectively evaluate the strength of the weld under pressure and the structural stability of the steel caisson during floating and sinking, and has high scientificity and reliability.

[0034] (3) The method adopts the water level monitoring system to dynamically monitor the water level changes in each compartment in real time. This method replaces the traditional manual measurement method, which not only simplifies the detection process but also ensures the accuracy of the detection data. Therefore, the water level monitoring system not only improves work efficiency, but also reduces human errors, making the inspection results more accurate.

[0035] (4) Most existing inspection methods inspect the welds of steel structures. The method provided by the present invention can not only inspect the weld quality of the caisson steel shell itself, but also inspect the sealing of the water-stop structure between the caisson steel shell and the buoyancy plate. Therefore, the inspection items of the method are more complete and comprehensive, with higher applicability, and can be used for the inspection of various watertight structures.

[0036] (5) Existing inspection methods usually rely on precise testing instruments to operate. These instruments are not only expensive, but also require extremely high professional skills of the inspectors. However, the method provided by the present invention does not require precise instruments, and the inspectors only need to operate the water pump switch to easily complete the inspection work. Therefore, the method is convenient and efficient, has low requirements on the quality of the inspectors, and has a higher promotion significance.

[0037] (6) After the inspection is completed, the method only needs to drain the water in the steel caisson through the high-lift water pump, without cleaning the inspection residues, which is convenient and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A top view of the steel shell of the caisson according to an embodiment of the present invention;

[0039] Figure 2 Schematic diagram of the partitions of the compartments described in the embodiment of the present invention (the colors in the figure are only for the convenience of understanding the scope and boundaries of each partition, and do not represent the physical color characteristics of each partition);

[0040] Figure 3 Schematic diagram of the plan layout of the water injection and drainage system in the embodiment of the present invention (the colors in the figure are only for the convenience of understanding the scope and boundaries of each partition, and do not represent the physical color characteristics of each partition);

[0041] Figure 4 It is a schematic elevational layout diagram of the water injection and drainage system described in an embodiment of the present invention;

[0042] Figure 5 Schematic diagram of the plan layout of the water level monitoring system in an embodiment of the present invention (the colors in the figure are only for the convenience of understanding the scope and boundaries of each partition, and do not represent the physical color characteristics of each partition);

[0043] Figure 6 It is a schematic diagram of the elevation layout of the water level monitoring system described in an embodiment of the present invention;

[0044] Figure 7 It is a flow chart of the method in the water injection inspection stage according to an embodiment of the present invention;

[0045] Figure 8 Schematic diagram of the bottom cavity of the buoyancy aid plate in an embodiment of the present invention.

[0046] Markings in the figure are: 1-caisson steel shell, 11-compartment, 111-sealing plate, 12-well wall, 13-well hole, 14-blade foot, 15-blade foot concrete, 2-floating plate, 21-water injection valve, 22-cavity, 3-water injection and drainage system, 31-permanent magnet pump, 311-external water pipe, 312-temporary fixed frame, 32-high lift water pump, 33-operating cabinet, 4-water level monitoring system, 41-water level meter, 42-monitoring host, 43-monitoring wiring, 5-construction platform. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0048] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0049] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "installed / connected", "connected", etc. should be understood in a broad sense. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0050] like Figures 1 to 8As shown, an embodiment of the present invention provides a method for testing the sealing performance of a steel caisson structure. To facilitate the introduction of the implementation steps of the method, the structural construction and construction divisions of the steel caisson are first described.

[0051] like Figure 1 As shown, the steel caisson is square in shape as a whole, 66 meters long and 48 meters wide in the horizontal direction, and the total height including the cofferdam is 31.6 meters. The main body of the steel caisson is a porous steel shell, hereinafter referred to as the caisson steel shell 1. On the horizontal plane, the caisson steel shell 1 is divided into 35 independent compartments 11. Three or four adjacent compartments 11 form a partition, dividing the caisson steel shell 1 into nine symmetrically distributed partitions. The specific numbers of the compartments and the partitions are as follows: Figure 2 Any two adjacent partitions remain sealed, and the compartments in each partition are interconnected. To avoid confusion, the compartments mentioned below will be accompanied by specific codes.

[0052] For each partition, a compartment is selected as a water injection compartment, such as compartment 6 in partition 1, compartment 3 in partition 2, compartment 16 in partition 4, compartment 18 in partition 5, etc. Except for partition 5, the water injection compartments should be selected close to the periphery of the steel caisson to facilitate subsequent water injection and drainage. In the same partition, the water injection compartment is set up with full height without a blocking plate, while the remaining adjacent compartments are all set with a blocking plate 111 at a position slightly lower than 10.0 meters (see Figure 4 or Figure 6 ). The function of the blocking plate 111 is to control the speed of the steel caisson when it is filled with water and sinks in the sea, ensuring that the sinking posture of the steel caisson is stable and does not capsize. As a general technology in this field, this article will not go into details. The compartments in the same partition are connected to each other near the bottom. Therefore, it is only necessary to fill water into the water-filled compartment in the future to make the water level of all compartments in the same partition rise to the height of the blocking plate 111.

[0053] Depend on Figure 1 to Figure 6 It can be seen that the 35 compartments construct 24 wells 13 in the internal space of the steel caisson. The steel caisson also includes 24 flotation plates 2. The flotation plates 2 are tightly connected to the bottom of the wells 13 to provide buoyancy for the steel caisson when it is undocking and floating. In this embodiment, the total drainage area of ​​the steel caisson after closure is approximately 3155 square meters. According to the model deadweight of the steel caisson, it can be estimated that its draft in the flotation state is approximately 5 meters. The flotation plates 2 are detachable. During the positioning and sinking of the steel caisson, the draft and sinking of the steel caisson can be controlled by gradually and symmetrically removing some of the flotation plates 2. Additionally, at the bottom of the steel caisson, a blade foot 14 is provided along the circumference direction, which is used to punch the soil during the sinking of the steel caisson to reduce the sinking resistance.

[0054] like Figure 7 As shown, the present invention mainly checks the structural sealing of the steel caisson through the following aspects: (1) injecting water into the dock to observe whether the water enters the steel caisson through the edge of the float plate 2 to check the connection sealing of the float plate 2; (2) injecting water into the partitions one by one to check: ① the sealing of the blocking plate 111; ② whether the wall 12 and compartment of the steel caisson are leaking to the outside; ③ whether there is mutual leakage between any adjacent partitions. It can be understood that the above-mentioned points ②③ are the "checking the sealing of the caisson" mentioned in the figure. It should be noted that the wall 12 refers to the outermost circle of the caisson steel shell 1, which is an important barrier and force-bearing body of the steel caisson. Figure 1 It can be seen that the well wall 12 is composed of the outermost circle of compartments.

[0055] Combined with the following Figures 1 to 8 , and describe in detail the implementation steps of the method.

[0056] Step 1: partition the compartments of the steel caisson. The specific partitions are as described above and will not be repeated here.

[0057] Step 2: Lay out water injection and drainage system 3. Water level monitoring system.

[0058] like Figure 3-4 As shown, a construction platform 5 is set up on the top of the steel caisson, and the water injection and drainage system 3 is laid out with the help of the construction platform 5. In this embodiment, the water injection pumps use two permanent magnet pumps 31. The two permanent magnet pumps 31 are symmetrically installed on the outside of the steel caisson and close to the outside of the well wall 12, so as to facilitate symmetrical water injection of the above-mentioned 9 partitions. The model of the permanent magnet pump 31 needs to be selected according to the maximum single water injection volume. For this embodiment, it is recommended to control the single water injection time to within 2 hours to reduce waiting time.

[0059] The permanent magnet pump 31 injects the water in the dock into the compartment through the external water pipe 311. The selection of the external water pipe 311 needs to meet the following two points: first, the diameter is large enough to be able to transport the water flow when the permanent magnet pump 31 works at maximum power; second, steel pipes are selected. Compared with hoses, steel pipes can withstand higher working water pressure and are more convenient to fix. The external water pipe 311 is long, so it is necessary to set a number of temporary fixing frames 312 at intervals along the height direction on the well wall 12 to support the external water pipe 311 in sections. The elbow joint of the external water pipe 311 is connected to the straight pipe section by flanges, which is convenient for quick installation and removal. In order to facilitate the rapid adjustment of the outlet position to inject water into the specified partition, the external water pipe 311 is extended to the construction platform 5 at the top of the steel caisson and then extended by a hose. The hose and the external water pipe 311 are connected by a fixing clamp.

[0060] In this embodiment, the drainage pump adopts a high-lift water pump 32, and one high-lift water pump 32 is arranged in each partition. As shown in the figure, it is easy to know from the above that the high-lift water pump 32 is arranged at the bottom of the water injection compartment of each partition. In order to operate the electromagnetic pump and the high-lift water pump 32 in time according to the actual situation on site, the operation cabinets 33 of all water pumps are installed on the construction platform 5 at the top of the steel caisson, and several operators are equipped to operate in the nearby area of ​​the construction platform 5. The plane layout of the water injection and drainage system 3 is shown in the figure.

[0061] like Figure 5-6 As shown, the water level monitoring system 4 includes a plurality of water level gauges 41 and a monitoring host 42. A water level gauge 41 is arranged in each compartment. The water level gauge 41 is installed on the top surface of the blade foot concrete 15 to monitor the change of the water level in the compartment. Each water level gauge 41 collects the monitoring data to the monitoring host 42 through the monitoring line 43, and a dedicated person is responsible for the duty to timely feedback the water level information to the pump operator.

[0062] Step 3: Fill the dock with water and check the sealing of the buoyancy plate 2.

[0063] The dock is filled with water using the dock's own water pump. When the water filling height reaches 1.0 m, the water surface has submerged the blade foot 14. In this embodiment, the 1.0 m is the third height described in the claims. Figure 8 As shown, at this time, there is still a part of the air under the floating board 2 that has not been discharged in time to form a closed cavity 22. The cavity 22 will hinder the water level from rising to the bottom of the floating board 2, affecting the subsequent inspection work. Therefore, it is necessary to open the water injection valve 21 pre-installed on the top of the floating board 2 to discharge the air in the cavity 22 from the inside of the steel caisson. After the exhaust is completed, close the water injection valve 21. Then continue to inject water into the dock to a water level of 4.5 meters, visually check whether water has penetrated into the steel caisson from the edge of the floating board 2, mark the existing leaks and retain image data. It can be understood that in this embodiment, the floating height is 4.5 meters. The reason why the observation water level is set at a height of 4.5 meters is that: if the water injection height is too high, the steel caisson will be in a floating state, and uncontrolled shaking is prone to occur, which will bring safety risks to the operator; if the water injection height is too low, the actual working water pressure of the floating board 2 cannot be accurately simulated.

[0064] Step 4: Fill the first batch of partitions with water to a height of 10.0 meters and check the sealing performance of the blocking plate 111.

[0065] Continue to inject water into the dock to submerge the permanent magnetic pump 31. Then turn on the permanent magnetic pump 31 to inject water into the partitions of the steel caisson. In order to ensure that the overall force of the steel caisson is uniform, each partition needs to be symmetrically injected with water. In this embodiment, the specific water injection sequence is: the first batch: inject water into partitions 2 and 8 at the same time; the second batch: inject water into partitions 1 and 9 at the same time; the third batch: inject water into partitions 3 and 7 at the same time; the fourth batch: inject water into partitions 4 and 6 at the same time; the fifth batch: inject water into partition 5.

[0066] The following steps are now described with the first batch of water injection partitions - partition two and partition eight as the object. As can be seen from the above, it is only necessary to inject water into the water injection compartment 3 and the water injection compartment 33 to raise the water levels of all the compartments in the partition two and partition eight respectively. For partition two and partition eight, when the water level in the water injection compartment rises and stabilizes to 10.0 meters, it means that the water level of all the compartments in the partition has reached the height of the sealing plate 111. Therefore, at this time, it is only necessary to observe with the naked eye whether there is water bubbling upward from each sealing plate 111 to check its sealing performance. If there is a water leak, the existing water leak point needs to be marked and the image data retained. It should be understood that in this embodiment, the first height in the claims is 10.0 meters.

[0067] Step 5: Continue to inject water into the first batch of partitions to a height of 19.5 meters to check the structural sealing of this batch of partitions.

[0068] For the second or eighth partition, after checking the sealing performance of the plugging plate 111, water can be injected synchronously to a height of 19.5 meters. Since the plugging plates 111 are installed in the other compartments except the water injection compartment, the water level cannot continue to rise. Therefore, there are two ways to inject water in this step: (1) inject water into each compartment to a height of 19.5 meters; (2) pre-set a connecting hole at a position higher than the plugging plate 111 on the wall of the water injection compartment, and then continue to inject water into the water injection compartment, which can also make the water level in the compartment of the same partition rise. When the water level of all compartments in the second and eighth partitions reaches 19.5 meters, observe with the naked eye whether the well wall 12 and compartments of the above partitions are leaking out, and then use the water level monitoring system 4 to continuously monitor the water level changes in each compartment in the above partitions. If the water level recorded in the water level monitoring system 4 drops, it is necessary to manually check, mark the leaking point, and retain the image data. It should be understood that, in this embodiment, the second height in the claims is 19.5 meters.

[0069] In this step, the reason why the observation water level is set at 19.5 meters is that: if the water injection height is too high, the water level difference between the inside and outside of the compartment will be too large, causing the compartment wall to be damaged due to the excessive water pressure, seriously affecting the structural strength of the steel caisson. If the water injection height is too low, the working surface of this inspection will be too small. Therefore, after force analysis and verification of the steel caisson of this embodiment, the water injection height of this step is set to 19.5 meters to ensure that the structural strength of the steel caisson itself is within a safe range. Therefore, in this embodiment, the so-called 19.5 meters can be understood as the maximum water injection height to ensure that the steel caisson does not suffer structural damage. For steel caissons of different forms and volumes, the second height corresponds to different values, which require specific analysis of specific working conditions.

[0070] Step 6: Refer to Step 3 and Step 4 to inspect the remaining batches of partitions separately.

[0071] like Figure 2 As shown, specifically, water is injected into the second batch of analysis - partition one and partition nine at the same time, and the blocking plates 111 in the two partitions are tested when the water level reaches 10.0 meters, and the overall structural sealing of the two partitions is tested when the water level reaches 19.5 meters. Then, according to the above-mentioned water injection sequence, the third batch of partitions, the fourth batch of partitions and the fifth batch of partitions are tested respectively.

[0072] Step 7: After all zones have been inspected, drain the water from each zone.

[0073] After confirming that all the partitions have been inspected and the leaking points have been recorded, the high-lift water pump 32 is turned on to synchronously pump out the water in each partition to provide a dry working environment for subsequent repair work. At this point, the structural sealing inspection of the steel caisson is completed.

[0074] The following is an analysis of the technical advantages of the method provided in this embodiment in combination with the above steps.

[0075] (1) The method creatively uses the method of batch water injection to test the sealing of steel caissons, which can not only realize the batch inspection of large-scale weld quality, but also effectively solve the problem of missed inspection in the prior art, reflecting the comprehensiveness. Moreover, in this way, the defects of the weld can be visualized, which is convenient for inspection personnel to find and identify, making the inspection work more convenient and efficient.

[0076] (2) The method injects high water level into the dock and caisson steel shell 1, accurately simulating the water pressure to which the steel caisson is subjected during operation. Therefore, the method can scientifically and objectively evaluate the strength of the weld under pressure and the structural stability of the steel caisson during floating and sinking, and has high scientificity and reliability.

[0077] (3) The method adopts the water level monitoring system to dynamically monitor the water level changes in each compartment in real time. This method replaces the traditional manual measurement method, which not only simplifies the detection process but also ensures the accuracy of the detection data. Therefore, the water level monitoring system not only improves work efficiency, but also reduces human errors, making the inspection results more accurate.

[0078] (4) Most existing inspection methods inspect the welds of steel structures. However, the method provided in this embodiment can not only inspect the weld quality of the caisson steel shell 1 itself, but also inspect the sealing of the water-stop structure between the caisson steel shell 1 and the buoyancy plate 2. Therefore, the inspection items of the method are more complete and comprehensive, with higher applicability, and can be used for the inspection of various watertight structures.

[0079] (5) Existing inspection methods usually rely on precise testing instruments to operate. These instruments are not only expensive, but also require extremely high professional skills of the inspectors. However, the method provided in this embodiment does not require precise instruments, and the inspectors only need to operate the water pump switch to easily complete the inspection work. Therefore, the method is convenient and efficient, has low requirements on the quality of the inspectors, and has a higher promotion significance.

[0080] (6) After the inspection is completed, the method only needs to drain the water in the steel caisson through the high-lift water pump 32, without cleaning the inspection residues, which is convenient and environmentally friendly.

[0081] The above description is only a preferred specific implementation mode of the present invention, and does not limit the patent scope of the present invention. Any technical equivalent changes made using the contents of the present invention specification shall fall within the protection scope of the present invention.

Claims

1. A method for testing the sealing performance of a steel caisson structure, characterized in that: In terms of structure: the main body of the steel caisson is a caisson steel shell; the caisson steel shell is constructed of a plurality of compartments; the steel caisson also includes a floating plate sealed and connected to the bottom of the caisson steel shell; The method comprises the following steps: Step 1: Divide the compartment into a plurality of symmetrically distributed partitions; any two adjacent partitions are sealed, and the compartments in the same partition are connected to each other at the bottom; For any partition, at least one compartment is provided with full height to serve as a water-filled compartment, and the remaining compartments are provided with blocking plates; Further, the partitions are divided into several batches according to the water injection sequence; Step 2: Lay out water injection and drainage systems, and water level monitoring systems; The water injection and drainage system includes at least two water injection pumps and a drainage pump; the water injection pump is arranged outside the steel caisson and injects water into the partition through an external water pipe; the drainage pump is arranged at the bottom of the water injection compartment of each partition; The water level monitoring system includes a plurality of water level gauges and a monitoring host; the water level gauges are arranged at the bottom of the partitions and feed back the water level monitoring data to the monitoring host; Step 3: Fill the dock with water to the buoyancy aid height, and check the sealing of the buoyancy aid plate; the buoyancy aid height is not lower than the setting height of the buoyancy aid plate; Step 4: Use the water injection pump to inject water into the water injection compartment of the first batch of partitions; when the water level in the water injection compartment is stabilized at a first height, observe whether there is water bubbling upwards on each blocking plate in the first batch of partitions; the first height is higher than the setting height of the blocking plate; Step 5: Continue to inject water into the first batch of partitions to a second height to test the structural sealing of the batch of partitions; the second height is the maximum water injection height that does not damage the safety of the steel caisson structure; The inspection of the sealing of the partition structure includes: visually observing whether the wall and compartment of the steel caisson are leaking water, and then continuously monitoring the water level change in the partition with the help of the water level monitoring system; if the water level monitoring data is abnormal, it is necessary to manually check the leakage point; Step 6: Refer to Step 4 and Step 5 to perform water filling and sealing tests on the remaining batches of partitions; Step 7: After the inspection is completed, use the drainage pump to drain the water in all partitions to provide a dry working environment for the repair work.

2. The method for testing the sealing performance of a steel caisson structure according to claim 1 is characterized in that: The step 3 also includes: When the water filling height in the dock reaches a third height, the cavity that may exist at the bottom of the buoyant board is discharged through a water filling valve installed on the top of the buoyant board; The third height is not lower than the height of the blade foot at the bottom of the steel caisson and is lower than the buoyancy aid height.

3. The method for testing the sealing performance of a steel caisson structure according to claim 1, characterized in that: The partitions of the same batch are symmetrical about the center point of the steel caisson.

4. The method for testing the sealing performance of a steel caisson structure according to claim 1 is characterized in that: The water injection method in step 5 is: inject water into each compartment in the first batch partition separately.

5. The method for testing the sealing performance of a steel caisson structure according to claim 1, characterized in that: The water injection method in step 5 is: pre-arrange a connecting hole on the bulkhead of the water injection compartment; the position of the connecting hole is higher than the blocking plate; continue to inject water into the water injection compartment to cover the connecting hole, and also realize water injection into the compartments in the same area.

6. The method for testing the sealing performance of a steel caisson structure according to claim 1, characterized in that: In step 3, the value of the buoyancy aid height is not greater than the draft of the steel caisson in the bottom-sealed state, and is within 1.0 meter of the latter.

7. The method for testing the sealing performance of a steel caisson structure according to claim 1, characterized in that: In step 2, a water level gauge is arranged in each compartment.

8. The method for testing the sealing performance of a steel caisson structure according to claim 1, characterized in that: In step 2, the external water pipe is a steel pipe; A plurality of temporary fixing frames are arranged at intervals along the height direction on the outer wall of the steel caisson to support the external water pipe in sections.

9. The method for testing the sealing performance of a steel caisson structure according to claim 1, characterized in that: The partition comprises three or four of the compartments.

10. The method for testing the sealing performance of a steel caisson structure according to claim 1, characterized in that: The water injection pump adopts a permanent magnet pump, and the drainage pump adopts a high-lift water pump.

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