Automatic water injection and deviation correction method for cofferdam

Abstract

The present application belongs to the technical field of deep water foundation double-wall steel cofferdam construction, and provides a cofferdam automatic water injection deviation correction system and method, which solves the problem of low efficiency and low process control precision in water level monitoring and control by a dedicated person at any time during cofferdam sinking water injection, and is prone to errors. An inclinometer is arranged at each corner of the cofferdam, the inclinometer is used for monitoring the inclination state of the cofferdam, a data transceiver is used for collecting real-time data monitored by the inclinometer and transmitting the data to a centralized controller, the centralized controller compares the above data after analysis and processing with a warning value built in the system, and sends a conduction or closing instruction to a water injection electromagnetic valve; a circle of water injection pipelines is arranged along the cofferdam, and a water injection electromagnetic valve is arranged on each water injection pipeline for controlling water injection into the water injection tank. The present application can realize accurate automatic deviation correction during cofferdam sinking.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of deep water foundation double-wall steel cofferdam construction, and particularly relates to a cofferdam automatic water injection deviation rectification method. BACKGROUND

[0002] The steel shell of the cofferdam wall of the double-wall steel cofferdam is composed of inner and outer wall plates with stiffening ribs and several layers of horizontal trusses, and the spacing of the horizontal trusses is 1.0-1.4 m, which is calculated according to the water head pressure in the water filling and sinking stages of the cofferdam and the water head pressure in the water pumping stage of the cofferdam. The double-wall steel cofferdam is generally used to cooperate with the construction of large-diameter drill hole group pile foundations in deep water. The double-wall steel cofferdam method constructs a foundation that is a floating (bedded and non-bedded) caisson plus a drill hole foundation. The steel caisson only plays a role of a construction cofferdam and does not participate in the stress of the main structure, and the base thereof does not adopt a large-area cleaning of the base silt method, but a drill hole embedded in rock. There is no support system in the cofferdam, the working surface is wide, and the mud suction sinking, base cleaning drill hole and pouring of underwater concrete are very convenient. The steel cofferdam only plays a role of a temporary cofferdam in construction, and is cut and removed underwater for recycling after the completion of the project to a certain stage. The lower part that cannot be cut off can protect the drill hole pile foundation and prevent the foundation from being eroded and the weathered rock from being damaged due to changes in the riverbed.

[0003] In the past, during the water injection and sinking process of the double-wall steel cofferdam, a communication valve is arranged on the cofferdam wall plate, the local communication valve of the side plate is closed, a submersible pump is connected to the water inlet and outlet valve to pump river water, the water inlet and outlet valves are symmetrically arranged on the side plate of the cofferdam to pour water into the cofferdam wall, the water pouring amount is kept consistent, the plan position and inclination of the cofferdam are adjusted, and the overall balance of the cofferdam is ensured to sink to the stable layer.

[0004] However, the water injection process needs a person to monitor and control the water level at any time, the efficiency is low, the process control precision is low, and errors are easily caused. SUMMARY

[0005] The application provides a cofferdam automatic water injection deviation rectification method to solve at least one of the above technical problems in the prior art.

[0006] The application adopts the technical scheme as follows: a cofferdam automatic water injection deviation correction method, comprising an inclination meter, a data transceiver, a centralized controller, a water injection pipeline and a water injection electromagnetic valve, wherein the cofferdam is provided with the inclination meter at four corners, the inclination meter is used for monitoring the inclination state of the cofferdam, the data transceiver is used for collecting real-time data monitored by the inclination meter and transmitting the data to the centralized controller, the centralized controller compares the data after analysis and processing with a warning value built in the system and sends a turn-on or turn-off instruction to the water injection electromagnetic valve; the water injection pipeline is arranged along the cofferdam, the inner cavity of the cofferdam is divided into multiple independent water injection compartments by a partition plate, the multiple water injection compartments are sequentially arranged along the cofferdam, and the lower end of the water injection pipeline is provided with a water injection branch pipeline corresponding to the position of each water injection compartment, and the water injection electromagnetic valve is arranged on the water injection branch pipeline and used for controlling water injection of the water injection compartment; the method comprises the following steps:

[0007] S1: collecting position information of the four corners of the cofferdam in real time through the inclination meter and a GNSS measuring point device;

[0008] S2: transmitting the collected real-time data to the centralized controller through the data transceiver, comparing the test data of the four inclination meters and the GNSS measuring point device by the centralized controller, and judging the inclination direction of the cofferdam;

[0009] S3: comparing the real-time data of the inclination point position with the warning value built in the system according to the judged inclination direction, executing step S4 if the warning value is exceeded, and executing step S6 if the warning value is not exceeded;

[0010] S4: the centralized controller controls the water injection electromagnetic valve at the position of the elevated inclination point position to turn on and inject water into the corresponding water injection compartment;

[0011] S5: continuously comparing the real-time data of the inclination point position with the warning value built in the system until the warning value is lowered, the centralized controller turns off the water injection electromagnetic valve in step S4, removes the warning, restores the normal construction of the cofferdam sinking, and repeats the above steps;

[0012] S6: continuing to perform the sinking construction on the cofferdam and repeating the above steps.

[0013] Preferably, the GNSS monitoring device is further included, which is arranged at the four corners of the cofferdam and used for monitoring the plane deviation change value of the four corners of the cofferdam, thereby assisting in judging the inclination state of the cofferdam.

[0014] Preferably, the water injection compartment is lower than the top of the cofferdam, the water injection pipeline is anchored on the inclined support plate at the upper part of the cofferdam through an arc-shaped buckle, and the lower end of the water injection branch pipeline extends into the water injection compartment.

[0015] Preferably, the water injection pipeline is connected with the water pump placed outside the cofferdam through a steel wire hose, the lower end of the water pump is connected with a submersible pump, the steel wire hose is connected with the water injection pipeline and the water pump through flanges, and the water injection electromagnetic valve is connected with the water injection pipeline and the branch water injection pipeline through flanges.

[0016] Preferably, the number of the water injection cabins is 12, which are C1 cabin, C2 cabin, C3 cabin, C4 cabin, C5 cabin, C6 cabin, C7 cabin, C8 cabin, C9 cabin, C10 cabin, C11 cabin and C12 cabin, wherein the C1 cabin and the C12 cabin, the C4 cabin and the C5 cabin, the C6 cabin and the C7 cabin and the C10 cabin and the C11 cabin are respectively located at the four corners of the cofferdam; the number of the inclinometers is 4, which are a first inclinometer, a second inclinometer, a third inclinometer and a fourth inclinometer; the number of the GNSS monitoring devices is 4, which are a first GNSS monitoring device, a second GNSS monitoring device, a third GNSS monitoring device and a fourth GNSS monitoring device; wherein the first inclinometer and the first GNSS monitoring device are both located at the connection of the C1 cabin and the C12 cabin, the second inclinometer and the second GNSS monitoring device are both located at the connection of the C4 cabin and the C5 cabin, the third inclinometer and the third GNSS monitoring device are both located at the connection of the C6 cabin and the C7 cabin, and the fourth inclinometer and the fourth GNSS monitoring device are both located at the connection of the C10 cabin and the C11 cabin.

[0017] Compared with the prior art, the beneficial effects of the present application are:

[0018] In the process of sinking the cofferdam, the present application adopts the water injection mode of the partition wall cabin to correct the deviation, which can improve the efficiency and ensure the smooth sinking of the cofferdam, and the planar position and the inclination monitoring results are compared with the early warning values after analysis and processing to determine whether to inject water into the related water injection cabin for automatic deviation correction. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0020] Figure 1 is a flow chart of the automatic water injection deviation correction system in the present embodiment;

[0021] Figure 2 is a structural schematic view of the first cofferdam in the present embodiment;

[0022] Figure 3 is a structural schematic view of the second cofferdam in the present embodiment;

[0023] Figure 4is a water injection instruction table in the embodiment;

[0024] Figure 5 is a structural schematic diagram at a water injection pipeline in the embodiment;

[0025] Figure 6 is a water injection tank table corresponding to the inclined form and the inclined overrun in the embodiment.

[0026] In the figure: 1.1-first inclinometer; 1.2-second inclinometer; 1.3-third inclinometer; 1.4-fourth inclinometer; 2-water injection pipeline; 2.1-sub water injection pipeline; 3-water injection electromagnetic valve; 4.1-first GNSS monitoring device; 4.2-second GNSS monitoring device; 4.3-third GNSS monitoring device; 4.4-fourth GNSS monitoring device. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application are clearly and completely described in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0028] It should be understood that the structures, proportions, sizes, etc. shown in the drawings attached to the present specification are only used to understand and read the content disclosed in the present specification by those skilled in the art, and do not define the limiting conditions for the implementation of the present application, so they do not have technical substantive significance. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application. It should be noted that in the present specification, relationship terms such as first and second are only used to distinguish one entity from another entity, and do not necessarily require or imply any such actual relationship or order between the entities.

[0029] The present application provides an embodiment:

[0030] As Figure 1 , Figure 5As shown, a cofferdam automatic water injection correction system comprises an inclinometer, a data transceiver, a centralized controller, a water injection pipeline 2 and a water injection electromagnetic valve 3, wherein the cofferdam is provided with an inclinometer at each corner, the inclinometer is used for monitoring the inclination state of the cofferdam, the data transceiver is used for collecting real-time data monitored by the inclinometer and transmitting the data to the centralized controller, the centralized controller compares the above-mentioned data with the early warning value built-in the system after analyzing and processing the data, and sends a turn-on or turn-off instruction to the water injection electromagnetic valve 3; the water injection pipeline 2 is arranged along the cofferdam, and the lower end of the water injection pipeline 2 is provided with a water injection branch pipe 2.1 corresponding to the position of each water injection tank, and the water injection electromagnetic valve 3 is arranged on the water injection branch pipe 2.1 and used for controlling the water injection of the water injection tank.

[0031] In the present application, the structure of the cofferdam is a double-wall cofferdam, and the inner cavity of the cofferdam is divided into multiple independent water injection tanks by a partition plate, and the multiple water injection tanks are sequentially arranged along the cofferdam.

[0032] In order to make the judgment of the inclination of the cofferdam more accurate, the present application further comprises a GNSS monitoring device, which is arranged at the four corners of the cofferdam and is used for monitoring the plane offset change value at the four corners of the cofferdam, thereby playing a role of auxiliary judgment of the inclination state of the cofferdam, and through the cooperation of the inclinometer and the GNSS monitoring device, the accurate judgment of the inclination state of the cofferdam is realized, and the centralized controller compares the above-mentioned data with the early warning value built-in the system after analyzing and processing the data, and then sends a water injection instruction to the corresponding water injection tank, so that the cofferdam remains stable during the sinking process.

[0033] The water injection tank is lower than the top of the cofferdam, the water injection pipeline 2 is anchored on the inclined support plate of the upper part of the cofferdam through an arc-shaped buckle, and the lower end of the water injection branch pipe 2.1 extends into the water injection tank. The water injection pipeline 2 is connected with a water pumping pipe arranged in the water outside the cofferdam through a steel wire hose, the lower end of the water pumping pipe is connected with a submersible pump, the steel wire hose is connected with the water injection pipeline 2 and the water pumping pipe through flanges, and the water injection electromagnetic valve 3 is connected with the water injection pipeline 2 and the water injection branch pipe 2.1 through flanges.

[0034] The number of inclinometers is four, which are a first inclinometer 1.1, a second inclinometer 1.2, a third inclinometer 1.3 and a fourth inclinometer 1.4, and the number of GNSS monitoring devices is four, which are a first GNSS monitoring device 4.1, a second GNSS monitoring device 4.2, a third GNSS monitoring device 4.3 and a fourth GNSS monitoring device 4.4.

[0035] The present application provides a cofferdam automatic water injection correction method, which comprises the following steps:

[0036] S1: collecting position information of the four corners of the cofferdam in real time through the inclinometer and the GNSS measuring point device;

[0037] S2: The collected real-time data is transmitted to the central controller via a data transceiver. The central controller compares the test data from the four inclinometers and GNSS measuring point devices to determine the tilt direction of the cofferdam.

[0038] S3: Based on the determined tilt direction, the central controller compares the real-time data at the tilt point with the system's built-in warning value. If the data exceeds the warning value, step S4 is executed; otherwise, step S6 is executed.

[0039] S4: The centralized controller controls the opening of the water injection solenoid valve at the elevation rise position of the tilt point to inject water into the corresponding water injection chamber;

[0040] S5: Continuously compare the real-time data at the tilt point with the system's built-in warning value until it falls below the warning value. Then, the central controller closes the water injection solenoid valve in step S4, cancels the warning, resumes normal construction of the cofferdam sinking, and repeats the above steps.

[0041] S6: Continue the sinking construction of the cofferdam and repeat the above steps.

[0042] like Figure 2 As shown, in this embodiment, the number of water injection chambers in a cofferdam is 12, namely chambers C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, and C12. Chambers C1 and C12, C4 and C5, C6 and C7, and C10 and C11 are located at the four corners of the cofferdam, respectively. The first inclinometer 1.1 and the first GNSS monitoring device 4.1 are both located at the connection between chambers C1 and C12. The corresponding points are Q1 and P1; the second inclinometer 1.2 and the second GNSS monitoring device 4.2 are both located at the connection between C4 and C5, corresponding to points Q2 and P2; the third inclinometer 1.3 and the third GNSS monitoring device 4.3 are both located at the connection between C6 and C7, corresponding to points Q3 and P3; the fourth inclinometer 1.4 and the fourth GNSS monitoring device 4.4 are both located at the connection between C10 and C11, corresponding to points Q4 and P4.

[0043] like Figure 4As shown, if the tilt is a single-point inward tilt (elevation rise), the elevation rise point is Q1, and the plane deviation changes most at P1 and P3. If it exceeds the warning value, water will be injected into compartments C1, C2, and C12; if the elevation rise point is Q2, and the plane deviation changes most at P2 and P4, if it exceeds the warning value, water will be injected into compartments C3, C4, and C5; if the elevation rise point is Q3, and the plane deviation changes most at P1 and P3, if it exceeds the warning value, water will be injected into compartments C6, C7, and C8; if the elevation rise point is Q4, and the plane deviation changes most at P2 and P4, if it exceeds the warning value, water will be injected into compartments C9, C10, and C11.

[0044] If the tilt pattern is a two-point inward tilt (elevation rise), with elevation rise points Q1 and Q2, and the largest changes in plane deviation at P1 and P2, if the tilt exceeds the warning value, water will be injected into compartments C1, C2, C3, and C4; with elevation rise points Q2 and Q3, and the largest changes in plane deviation at P2 and P3, if the tilt exceeds the warning value, water will be injected into compartments C4, C5, C6, and C7; with elevation rise points Q3 and Q4, and the largest changes in plane deviation at P3 and P4, if the tilt exceeds the warning value, water will be injected into compartments C7, C8, C9, and C10; with elevation rise points Q1 and Q4, and the largest changes in plane deviation at P1 and P4, if the tilt exceeds the warning value, water will be injected into compartments C1, C10, C11, and C12.

[0045] If the tilt pattern is a three-point inward tilt, then determine the point with the highest elevation rise and treat it as a single-point inward tilt.

[0046] like Figure 3 As shown, in this embodiment, the other type of cofferdam has 16 water injection chambers, namely chambers C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, and C16. Chambers C1 and C16, C4 and C5, C8 and C9, and C12 and C13 are located at the four corners of the cofferdam, respectively. The first inclinometer 1.1 and the first GNSS monitoring device 4.1 are both located at... The connection points between compartments C1 and C16 are Q1 and P1, respectively; the second inclinometer 1.2 and the second GNSS monitoring device 4.2 are both located at the connection points between compartments C4 and C5, respectively, at Q2 and P2; the third inclinometer 1.3 and the third GNSS monitoring device 4.3 are both located at the connection points between compartments C8 and C9, respectively, at Q3 and P3; the fourth inclinometer 1.4 and the fourth GNSS monitoring device 4.4 are both located at the connection points between compartments C12 and C13, respectively, at Q4 and P4.

[0047] like Figure 4As shown, if the tilt form is single-point inner deviation (elevation rise), the elevation rise point is Q1, the P1, P3 plane deviation changes the most, if it exceeds the early warning value, then water is injected into the C1 cabin, C2 cabin, C15 cabin, C16 cabin; the elevation rise point is Q2, the P2, P4 plane deviation changes the most, if it exceeds the early warning value, then water is injected into the C3 cabin, C4 cabin, C5 cabin, C6 cabin; the elevation rise point is Q3, the P1, P3 plane deviation changes the most, if it exceeds the early warning value, then water is injected into the C7 cabin, C8 cabin, C9 cabin, C10 cabin; the elevation rise point is Q4, the P2, P4 plane deviation changes the most, if it exceeds the early warning value, then water is injected into the C11 cabin, C12 cabin, C13 cabin, C14 cabin;

[0048] If the tilt form is two-point inner deviation (elevation rise), the elevation rise point is Q1, Q2, the P1, P2 plane deviation changes the most, if it exceeds the early warning value, then water is injected into the C1 cabin, C2 cabin, C3 cabin, C4 cabin; the elevation rise point is Q2, Q3, the P2, P3 plane deviation changes the most, if it exceeds the early warning value, then water is injected into the C5 cabin, C6 cabin, C7 cabin, C8 cabin; the elevation rise point is Q3, Q4, the P3, P4 plane deviation changes the most, if it exceeds the early warning value, then water is injected into the C9 cabin, C10 cabin, C11 cabin, C12 cabin; the elevation rise point is Q1, Q4, the P1, P4 plane deviation changes the most, if it exceeds the early warning value, then water is injected into the C13 cabin, C14 cabin, C15 cabin, C16 cabin;

[0049] If the tilt form is three-point inner deviation, then the highest elevation rise point is determined, and the single-point inner deviation is processed.

[0050] In step S2, the four inclination angle meter test data are compared to determine the tilt direction:

[0051] 1. The tilt form is 24-axis: , and , and , and , and the P point coordinate changes as above.

[0052] ① The tilt form is 24+ axis :

[0053] , and , and , and , and , .

[0054] ② The tilt form is 24- axis :

[0055] , and , and , and , and , .

[0056] 2. Inclined form is 13 axis: , and , and , and , and P point coordinate changes as above.

[0057] ① Inclined form is 13+ axis :

[0058] , and , and , and , and , .

[0059] ② Inclined form is 13- axis :

[0060] , and , and , and , and , .

[0061] 3. Inclined form is 12 axis:

[0062] or four values are similar (error control in 5%), and , and P point coordinate changes as above.

[0063] and and and and and .

[0064] 4. Inclined form is 34 axis:

[0065] or four values are similar (error control in 5%), and , and the P point coordinate changes as above.

[0066] and and and and and .

[0067] 5. The tilt form is 14-axis:

[0068] or four values are similar (error control in 5%), and , and the P point coordinate changes as above.

[0069] and and and and and .

[0070] 6. The tilt form is 23-axis:

[0071] or four values are similar (error control in 5%), and , and the P point coordinate changes as above.

[0072] and and and and and .

[0073] In step S3, it is judged that the limit is exceeded:

[0074] 1. The tilt form is 24-axis: , or .

[0075] 2. The tilt form is 13-axis: , or .

[0076] 3. The tilt form is 12-axis: , or four values are similar (error control in 5%) and greater than the warning value.

[0077] 4. The tilt form is 34-axis: , or four values are similar (error control in 5%) and greater than the warning value.

[0078] 5. The tilt form is 14-axis: , or four values are similar (error control in 5%) and greater than the warning value.

[0079] 6. The tilt form is 23 axis: Or four values are close (error control in 5%) and greater than the early warning value.

[0080] In step S4, water injection correction;

[0081] The tilt form and the tilt overrun open the corresponding water injection electromagnetic valve, and the corresponding relationship is as shown in Figure 6 .

[0082] The above is only the preferred specific 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 within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A cofferdam automatic water injection deviation correction method, characterized in that: The application comprises an inclinometer, a data transceiver, a centralized controller, a water injection pipeline (2) and a water injection electromagnetic valve (3), wherein the inclinometer is arranged at the four corners of the cofferdam to monitor the inclination state of the cofferdam, the data transceiver is used to collect real-time data monitored by the inclinometer and transmit the data to the centralized controller, the centralized controller compares the data with the pre-warning value built in the system after analyzing and processing the data, and sends a conducting or closing instruction to the water injection electromagnetic valve (3); the water injection pipeline (2) is arranged along the cofferdam, the inner cavity of the cofferdam is divided into multiple independent water injection compartments by a partition, the multiple water injection compartments are sequentially arranged along the cofferdam, and the lower end of the water injection pipeline (2) is provided with a water injection branch pipeline (2.1) corresponding to the position of each water injection compartment, and the water injection electromagnetic valve (3) is arranged on the water injection branch pipeline (2.1) to control the water injection of the water injection compartment. The method comprises the following steps: S1: collecting position information of the four corners of the cofferdam in real time by the inclinometer and the GNSS measuring point device; S2: transmitting the collected real-time data to the centralized controller through the data transceiver, and comparing the test data of the four inclinometers and the GNSS measuring point device to determine the inclination direction of the cofferdam; In step S2, the test data of the four inclinometers is compared to determine the inclination direction, and the inclination form includes the following six types: The tilt form is 24 axes: meet , and , and , and , and the P point coordinate changes as above, and the P point coordinate is obtained by a GNSS measuring point device; The inclined form is 13-axis: meet , and , and , and , and the P point coordinate changes as above; The inclined form is 12-axis: meet Or four values are similar, and , and the P point coordinate changes as above; The inclined form is 34 axis: meet Or four values close, and , and the P point coordinate changes as above; The inclined form is 14-axis: meet Or four values are similar, and , and the P point coordinate changes as above; The inclined form is 23 axis: meet Or four values close, and , and the P point coordinate changes as above; S3: comparing the real-time data at the inclination point with the pre-warning value built in the system according to the determined inclination direction, if the pre-warning value is exceeded, step S4 is executed, and if the pre-warning value is not exceeded, step S6 is executed; In step S3, the steps of determining the overrun are as follows: The tilt form is 24 axes: Or , judged as over-limit; The tilt form is 13 axes: Or , judged as over-limit; The tilt form is 12 axes: Or four values are close and greater than the warning value, and the limit is judged. The tilt form is 34 axes: Or four values are close and greater than the warning value, judge as over limit; The tilt form is 14-axis: Or four values are close to each other and greater than the early warning value, and the limit is judged as exceeding. The tilt form is 23-axis: Or four values are close to each other and greater than the early warning value, and are judged as over-limit. S4: the centralized controller controls the water injection electromagnetic valve at the high position of the inclination point to conduct, and the corresponding water injection compartment is injected with water; S5: continuously comparing the real-time data at the inclination point with the pre-warning value built in the system until the pre-warning value is lower than the pre-warning value, the centralized controller closes the water injection electromagnetic valve in step S4, removes the pre-warning, restores the normal construction of the cofferdam sinking, and repeats the above steps; S6: continue to execute the sinking construction of the cofferdam, and repeat the above steps.

2. The automatic water injection deviation correction method for cofferdam according to claim 1, characterized in that: The GNSS monitoring device is arranged at the four corners of the cofferdam to monitor the plane offset change value of the four corners of the cofferdam, and plays an auxiliary role in determining the inclination state of the cofferdam.

3. The automatic water injection deviation correction method for cofferdam according to claim 1, characterized in that: The water injection pipeline (2) is anchored on the inclined support plate at the upper part of the cofferdam through an arc-shaped buckle, and the lower end of the water injection branch pipeline (2.1) extends into the water injection compartment.

4. The automatic water injection deviation control method for cofferdam according to claim 1, characterized in that: The water injection pipeline (2) is connected with a water pumping pipe arranged outside the cofferdam through a steel wire hose, the lower end of the water pumping pipe is connected with a submersible pump, the steel wire hose is connected with the water injection pipeline (2) and the water pumping pipe through flanges, and the water injection electromagnetic valve (3) is connected with the water injection pipeline (2) and the water injection branch pipeline (2.1) through flanges.

5. The automatic water injection deviation control method for cofferdam according to claim 2, characterized in that: The number of the water injection cabins is 12, which are C1 cabin, C2 cabin, C3 cabin, C4 cabin, C5 cabin, C6 cabin, C7 cabin, C8 cabin, C9 cabin, C10 cabin, C11 cabin and C12 cabin, wherein C1 cabin and C12 cabin, C4 cabin and C5 cabin, C6 cabin and C7 cabin, C10 cabin and C11 cabin are respectively located at four corners of the cofferdam; the number of the inclinometers is 4, which are first inclinometer (1.1), second inclinometer (1.2), third inclinometer (1.3) and fourth inclinometer (1.4); the number of the GNSS monitoring devices is 4, which are first GNSS monitoring device (4.1), second GNSS monitoring device (4.2), third GNSS monitoring device (4.3) and fourth GNSS monitoring device (4.4); wherein the first inclinometer (1.1) and the first GNSS monitoring device (4.1) are both located at the connection of C1 cabin and C12 cabin, the second inclinometer (1.2) and the second GNSS monitoring device (4.2) are both located at the connection of C4 cabin and C5 cabin, the third inclinometer (1.3) and the third GNSS monitoring device (4.3) are both located at the connection of C6 cabin and C7 cabin, and the fourth inclinometer (1.4) and the fourth GNSS monitoring device (4.4) are both located at the connection of C10 cabin and C11 cabin.

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