Construction method of platform device special for deepwater underwater grouting

Abstract

The invention provides a construction method of a platform device special for deepwater underwater grouting, and belongs to the technical field of hydraulic engineering leakage treatment, and the construction method comprises the following steps: 1) constructing a buoyancy structure size calculation model considering surge height; 2) constructing a logarithm calculation model of the cable for resisting the 8-level wind load; 3) determining the number n of required closed hollow boxes, the width b of a single closed hollow box, the length l of the single closed hollow box, the height h of the single closed hollow box and the logarithm m of cables according to the buoyancy structure size calculation model and the logarithm calculation model of the 8-level wind load resistant cables; (4) according to the structural size and the number of the closed hollow boxes and the number of the cable pairs determined in the step (3), the multiple closed hollow boxes are connected into a whole through a connecting and supporting structure; and the floating body structure is fixed on a peripheral fixed object by using a mooring rope. The platform device constructed by the method can provide a construction platform for equipment and materials such as a drilling machine and grouting, diving of frogmen and operation of workers, can adapt to reservoir water level change and 8-level storm working environments, realizes all-weather 24-hour overwater operation construction of underwater grouting, and enables underwater large-scale drilling and grouting in front of a dam in a reservoir, such as ground leveling.

Description

Technical Field

[0001] The invention belongs to the technical field of water conservancy project leakage treatment, and more specifically, relates to a method for constructing a special platform device for deep-water underwater grouting. Background Art

[0002] Under the long-term effect of reservoir water, dam leakage problems are frequent and multiple, and reservoir safety continues to face severe challenges. Dam failure caused by leakage ranks first among the causes of dam failure. How to achieve leakage control without emptying the reservoir dam is a key problem facing the industry, specifically how to carry out large-scale underwater grouting to plug leaks under water depths of more than 60m.

[0003] Traditional deepwater grouting operations require divers to frequently go into the water, using air diving or mixed diving, which is extremely inefficient and difficult to implement for large-scale underwater drilling and grouting. Therefore, it is urgent to develop a special platform equipment for deepwater grouting, which can not only provide a construction platform for drilling rigs, grouting equipment, materials, frogman diving, and workers, but also adapt to the changes in reservoir water levels and the working environment of 8-level wind and waves, and ultimately realize the 24-hour water operation of underwater grouting, making large-scale underwater drilling and grouting in front of the dam in the reservoir as easy as walking on flat ground. Summary of the invention

[0004] The purpose of the present invention is to provide a method for constructing a special platform device for deep-water underwater grouting. The platform can not only provide a construction platform for drilling rigs, grouting equipment, materials, frogmen diving, and workers' operations, but also can adapt to reservoir water level changes and 8-level wind and wave working environments, and realize underwater grouting 24-hour water operations all-weather, making large-scale underwater drilling and grouting in front of the dam in the reservoir as easy as walking on flat ground.

[0005] To achieve the above-mentioned object, the present invention provides a method for constructing a special platform device for deep-water underwater grouting, wherein the platform device comprises a floating structure, a connecting support structure and an anti-wind load structure; the floating structure comprises n closed hollow boxes, the connecting support structure is used to connect the floating structure into a whole, and the anti-wind load structure comprises a cable for fixing the platform device; the construction method comprises the following steps:

[0006] 1) Construct a buoyancy structure size calculation model considering surge height:

[0007]

[0008] Where h is the height of a single closed hollow box, m; h 1 is the draft of the closed hollow box, m; α is the surge height coefficient; h 10％ is the wave height with cumulative frequency of 10%, m; L mis the average wavelength of the wave, m; H is the water depth of the reservoir where the platform device is located, m; n is the number of closed hollow boxes; b is the width of a single closed hollow box, m; l is the length of a single closed hollow box, m; k is the first safety factor; W 1 is the deadweight of the floating structure, N; W 2 is the self-weight of the connecting support structure, N; W 3 is the deadweight of platform construction machinery and personnel during the peak construction period, N; ρ is the density of water, 1000kg / m 3 ; g is the acceleration due to gravity, 9.8N / kg;

[0009] 2) Construct a logarithmic calculation model for cables that can withstand wind loads of level 8:

[0010]

[0011] Where m is the number of cable pairs; δ is the second safety factor; p is the wind pressure corresponding to the 8-level wind load; F 1 is the tensile strength of a single pair of cables, N; β is the angle between the cables and the main wind direction of the water surface;

[0012] 3) According to the buoyancy structure size calculation model and the cable logarithm calculation model for resisting level 8 wind load, determine the required number of enclosed hollow boxes n, the width b of a single enclosed hollow box, the length l of a single enclosed hollow box, the height h of a single enclosed hollow box and the number m of cable logarithms;

[0013] 4) According to the structural dimensions, quantity and number of cable pairs of the enclosed hollow boxes determined in step 3), the connecting support structure is used to connect multiple enclosed hollow boxes into one, and the floating structure is fixed to the surrounding fixed objects with cables.

[0014] Furthermore, the surge height coefficient α has a value of 0.8 to 1.0.

[0015] Furthermore, the first safety factor k is set to a value of 1.1 to 1.2.

[0016] Furthermore, the second safety factor δ is set at 1.1 to 1.2.

[0017] Furthermore, the angle β between the cable and the main wind direction of the water surface is 0° to 90°.

[0018] Furthermore, the platform construction machinery includes a drilling rig and grouting equipment.

[0019] Furthermore, the draft of the enclosed hollow box is 1 It is 1.0~1.2m.

[0020] Furthermore, the sealed hollow box is a steel hollow box.

[0021] Furthermore, the top and bottom of the sealed hollow box are respectively provided with an exhaust hole and a drain hole.

[0022] Furthermore, the connecting support structure includes floating body connecting steel, connecting steel bars, a floor and a railing; the connecting steel bars are symmetrically arranged in two rows and welded to the enclosed hollow boxes; the enclosed hollow boxes are connected horizontally and vertically by the connecting steel bars; the floor is laid on the floating body structure; and the railing is arranged on the inner side of the two rows of connecting steel bars.

[0023] Compared with the prior art, the present invention has the following technical effects:

[0024] The method for constructing a special platform device for deep-water underwater grouting of the present invention determines the structural size, quantity and number of cable pairs of the closed hollow box by constructing a buoyancy structure size calculation model considering the surge height and a cable pair calculation model for resisting level 8 wind load, so that the platform device of the present invention can realize large-scale underwater drilling and grouting 24 hours a day under the action of water level changes in the reservoir and level 8 wind and waves, and ensures the safety and stability of the construction, so that large-scale underwater drilling and grouting in front of the dam in the reservoir are like walking on flat ground, and improves the operation efficiency of deep-water underwater grouting. The platform device constructed by the method of the present invention can provide a construction platform for drilling rigs, grouting equipment, materials, frogman diving, and workers, has a good application prospect, and is suitable for 60-meter-level underwater grouting of reservoir dams. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 This is a schematic diagram of the overall structure of a special platform device for deep-water underwater grouting provided in Example 1 of the present invention;

[0027] Figure 2 for Figure 1 A side view schematic diagram of the structure;

[0028] Figure 3 for Figure 1 A schematic diagram of a top view of the structure (the floor is not shown in the figure);

[0029] Figure 4 for Figure 1 Schematic diagram of the structure of a single closed hollow box;

[0030] Figure 5 for Figure 4 Schematic diagram of the top view structure.

[0031] Among them, the reference numerals in the figure are:

[0032] 1. Sealed hollow box, 2. Connecting steel, 3. Connecting steel bars, 4. Handrails, 5. Anemometer, 101. Exhaust hole, 102. Drain hole. DETAILED DESCRIPTION

[0033] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0034] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0035] The terms "first" and "second" are used only for descriptive purposes to distinguish objects such as substances from each other, and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. For example, without departing from the scope of the embodiments of the present invention, the first XX may also be referred to as the second XX, and similarly, the second XX may also be referred to as the first XX. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0036] The embodiment of the present invention provides a method for constructing a deepwater underwater grouting dedicated platform device, wherein the platform device includes a floating structure, a connecting support structure and a wind load resistant structure, such as Figure 1-5 As shown. The floating structure includes n closed hollow boxes 1, which are used to ensure that the platform device floats stably on the water surface. The connecting support structure is used to connect the floating structure into a whole, and the wind load resistance structure includes a cable for fixing the platform device. The construction method of the embodiment of the present invention includes the following steps:

[0037] 1) Construct a buoyancy structure size calculation model considering surge height:

[0038]

[0039] Where h is the height of a single closed hollow box, m; h 1 is the draft of the closed hollow box, m; α is the surge height coefficient; h 10％ is the wave height with cumulative frequency of 10%, m; L mis the average wavelength of the wave, m; H is the water depth of the reservoir where the platform device is located, m; n is the number of closed hollow boxes; b is the width of a single closed hollow box, m; l is the length of a single closed hollow box, m; k is the first safety factor; W 1 is the deadweight of the floating structure, N; W 2 is the self-weight of the connecting support structure, N; W 3 is the deadweight of platform construction machinery and personnel during the peak construction period, N; ρ is the density of water, 1000kg / m 3 ; g is the acceleration due to gravity, 9.8N / kg;

[0040] 2) Construct a logarithmic calculation model for cables that can withstand wind loads of level 8:

[0041]

[0042] Where m is the number of cable pairs; δ is the second safety factor; p is the wind pressure corresponding to the 8-level wind load; F 1 is the tensile strength of a single pair of cables, N; β is the angle between the cables and the main wind direction of the water surface;

[0043] 3) According to the buoyancy structure size calculation model and the cable logarithm calculation model for resisting level 8 wind load, determine the required number of enclosed hollow boxes n, the width b of a single enclosed hollow box, the length l of a single enclosed hollow box, the height h of a single enclosed hollow box and the number m of cable logarithms;

[0044] 4) According to the structural dimensions, quantity and number of cable pairs of the enclosed hollow boxes determined in step 3), a plurality of enclosed hollow boxes are connected into one by using a connecting support structure, and the floating structure is fixed to surrounding fixed objects by using cables.

[0045] In the above step 1), the buoyancy structure size calculation model constructed in the embodiment of the present invention takes into account the surge height coefficient α, the water depth H of the reservoir where the platform device is located, and the average wavelength L of the wave (surge) m and the wave height h with cumulative frequency 10% 10％ For deepwater reservoirs, factors such as surge height and reservoir water depth H have a great influence on the stability of the constructed platform device. Therefore, when constructing the buoyancy structure size calculation model, the embodiment of the present invention introduces factors such as surge height coefficient α and reservoir water depth H where the platform device is located into the model to ensure the stability of the platform device against surges during deepwater underwater grouting operations. α can be determined based on engineering practices such as Xibeikou, and its value can be selected as 0.8 to 1.0. In addition, the first safety factor k is determined based on engineering practice, and its value can be 1.1 to 1.2, specifically, it can be 1.1.

[0046] The platform construction machinery of the embodiment of the present invention includes a drilling machine and a grouting device. The closed hollow box 1 can be a steel hollow box, and the draft depth of the closed hollow box 1 is h 1The value may be 1.0-1.2 m, and specifically, may be 1.0 m. The top and bottom of the closed hollow box 1 are provided with an exhaust hole 101 and a drain hole 102 respectively.

[0047] According to the buoyancy structure size calculation model constructed according to the embodiment of the present invention, the structural size and quantity of the floating closed hollow box 1 are determined in combination with the actual requirements of the specific project. If a large number of boxes are used, the box size can be reduced, otherwise the box size can be increased.

[0048] In the above step 2), the embodiment of the present invention constructs a logarithmic calculation model of cables resistant to wind loads of level 8 to ensure the stability of the platform device under wind loads of level 8, and connects the platform device to the surrounding mountains or dam buildings through cables, so that the platform device can adapt to the working environment of wind and waves of level 8.

[0049] The second safety factor δ is determined according to engineering practice, and its value can be 1.1-1.2, specifically, it can be 1.15. The value of p is generally 200 Pa, F 1 It is related to the cable diameter. The larger the diameter, the greater the cable's tensile strength. The angle β between the cable and the main wind direction of the water surface is 0° to 90°. The main wind direction of the platform device on the water surface is determined according to the specific project. The cable layout should be parallel to the main wind direction or intersect at a small angle as much as possible. The number of cable pairs required and their diameter are inversely proportional. The more cable pairs there are, the smaller their diameter is, and the lower the tensile strength of a single pair of cables is. Conversely, the larger their diameter is.

[0050] The embodiment of the present invention determines the required structural size and quantity of the closed hollow box and the number of cable pairs according to the buoyancy structure size calculation model and the cable pair calculation model for resisting level 8 wind load, so as to meet the operational stability and safety requirements of deepwater underwater grouting.

[0051] The connection support structure of the embodiment of the present invention includes a floating body connection steel 2, connection steel bars 3, a floor and a railing 4; the connection steel 2 is symmetrically arranged in two rows and welded to the closed hollow box 1; the closed hollow boxes 1 are connected horizontally and vertically by connection steel bars 3; the floor is laid on the floating structure; and the railing 4 is arranged on the inner side of the two rows of connection steel 2.

[0052] In a specific embodiment, the present invention provides a deep-water underwater grouting dedicated platform device, such as Figure 1-5As shown, the platform device includes a floating structure, a connecting support structure and a wind load resistant structure. The floating structure is composed of n closed hollow boxes 1, and its function is to ensure that the platform device floats stably on the water surface. Its structural size, quantity and spacing need to be combined with the specific project and determined by the buoyancy structure size calculation model constructed by the embodiment of the present invention. A single closed hollow box 1 is provided with an exhaust hole 101 and a drain hole 102, which are respectively located at the top and bottom of the box body, and a wind speed and direction meter 5 is provided on its upper part. The connecting support structure includes a floating body connecting steel 2, a connecting steel bar 3, a floor and a railing 4. The floor can be specifically made of wooden boards, and its function is to connect the closed hollow box 1 into a whole and provide a construction site for construction equipment and personnel. The connecting steel 2 is double-row, model I20, and is welded to the closed hollow box 1; the closed hollow boxes 1 are connected by horizontal and vertical connecting steel bars 3, the diameter of the horizontal and vertical connecting steel bars 3 is 28mm, the spacing is 20cm, and wooden boards are laid on it to facilitate the layout of construction equipment and construction of personnel. Stainless steel railings 4 are arranged inside the two rows of connecting steel sections 2. The railings 4 are 1.1m high. The upper handrails and columns of the railings 4 are made of φ60 steel pipes. The column spacing is 56cm, and three φ25 steel pipes are arranged between the two columns. The wind load resistant structure is mainly a cable, which connects the platform device to the surrounding mountains or dam buildings. To achieve the stability of the platform under the condition of 8-level wind load, it is necessary to combine the actual requirements of the specific project and use the 8-level wind load resistant cable logarithm calculation model constructed by the embodiment of the present invention to determine the number of cable logarithms and cable diameters connected to a single closed hollow box 1.

[0053] In a specific implementation, an embodiment of the present invention provides a method for constructing a deepwater underwater grouting dedicated platform device, comprising the following steps:

[0054] 1. Combined with the specific project, calculate the deadweight of the platform device and the deadweight of the platform construction machinery (drilling rigs, grouting equipment, etc.) and personnel during the peak construction period to obtain ΣW and calculate the average wave wavelength L m , the wave height h with cumulative frequency 10% 10％ .

[0055] 2. According to the buoyancy structure size calculation model considering the surge height constructed above, the size and number of the floating body's enclosed steel hollow box structure are determined in combination with the actual requirements of the specific project. If a large number of boxes are used, the box size can be reduced, otherwise the box size can be increased.

[0056] 3. Using the total station, place n floating closed steel hollow boxes on the water in sequence according to the direction of the curtain grouting axis, and the box tubes should be arranged in parallel with the curtain grouting axis.

[0057] 4. Place double rows of connecting steel on the floating structure. The connecting steel axis is parallel to the curtain grouting axis. It is located on both sides of the curtain grouting axis and is 4m away from the axis. Each closed steel hollow box floating structure is connected into a whole by welding.

[0058] 5. The closed steel hollow boxes are connected by horizontal and vertical connecting steel bars with a diameter of 28mm and a spacing of 20cm. Wooden boards are laid on top to facilitate the layout of construction equipment and construction personnel.

[0059] 6. Double rows of railings are arranged inside the two rows of connecting steel sections. The railings are made of steel pipes and are welded to the closed steel hollow box of the floating body or the connecting steel bars to form a unified whole.

[0060] 7. Determine the main wind direction of the operating water surface of the platform device according to the specific project. The cable layout should be parallel to the main wind direction or intersect at a small angle as much as possible, and calculate the 8-level wind load and wind pressure.

[0061] 8. According to the above-mentioned calculation model of cable pairs for resisting wind load of level 8, the number of cable pairs and diameter connected to a single closed steel hollow box are determined in combination with the actual requirements of the specific project. The two are inversely proportional. The more cable pairs there are, the smaller the diameter is, and the lower the tensile strength of a single pair of cables is. Conversely, the larger the diameter is.

[0062] 9. Fix both sides of the rope to the enclosed steel hollow box and the surrounding mountains or dam buildings respectively.

[0063] In view of the current situation that traditional deep-water grouting operations require divers to frequently go into the water, use air diving or mixed diving operations, have extremely low efficiency, and are difficult to implement large-scale underwater drilling and grouting, the embodiment of the present invention invents a method for constructing a special platform device for deep-water grouting. The platform device constructed by the construction method of the embodiment of the present invention can provide a construction platform for drilling rigs, grouting equipment, materials, frogman diving, and workers; and the platform device can realize large-scale underwater drilling and grouting 24 hours a day under the influence of changes in reservoir water level and 8-level wind and waves, and ensure safe and stable construction, so that large-scale underwater drilling and grouting in front of the dam in the reservoir can be as easy as walking on flat ground, thereby improving the operation efficiency of deep-water underwater grouting.

[0064] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. A method for constructing a special platform device for deep-water underwater grouting, characterized in that: The following steps are involved: 1) Construct a buoyancy structure size calculation model considering surge height: Wherein, h is the height of a single enclosed hollow box, m; h1 is the draft of the enclosed hollow box, m; α is the surge height coefficient; h 10％ is the wave height with cumulative frequency of 10%, m; L m is the average wavelength of the wave, m; H is the water depth of the reservoir where the platform device is located, m; n is the number of enclosed hollow boxes; b is the width of a single enclosed hollow box, m; l is the length of a single enclosed hollow box, m; k is the first safety factor; W1 is the deadweight of the floating structure, N; W2 is the deadweight of the connecting support structure, N; W3 is the deadweight of the platform construction machinery and personnel during the peak construction period, N; ρ is the density of water, 1000kg / m 3 ; g is the acceleration due to gravity, 9.8N / kg; 2) Construct a logarithmic calculation model for cables that can withstand wind loads of level 8: Among them, m is the number of cable pairs; δ is the second safety factor; p is the wind pressure corresponding to level 8 wind load; F1 is the tensile strength of a single pair of cables, N; β is the angle between the cable and the main wind direction of the water surface; 3) According to the buoyancy structure size calculation model and the cable logarithm calculation model for resisting level 8 wind load, determine the required number of enclosed hollow boxes n, the width b of a single enclosed hollow box, the length l of a single enclosed hollow box, the height h of a single enclosed hollow box and the number m of cable logarithms; 4) According to the structural dimensions, quantity and number of cable pairs of the enclosed hollow boxes determined in step 3), the connecting support structure is used to connect multiple enclosed hollow boxes into one, and the floating structure is fixed to the surrounding fixed objects with cables.

2. The method for constructing a deepwater underwater grouting dedicated platform device according to claim 1, characterized in that: The surge height coefficient α has a value of 0.8 to 1.

0.

3. The method for constructing a deepwater underwater grouting dedicated platform device according to claim 1, characterized in that: The first safety factor k is between 1.1 and 1.

2.

4. The method for constructing a deepwater underwater grouting dedicated platform device according to claim 1, characterized in that: The second safety factor δ is set at 1.1 to 1.

2.

5. The method for constructing a deepwater underwater grouting dedicated platform device according to claim 1, characterized in that: The angle β between the cable and the main wind direction of the water surface is 0° to 90°.

6. The method for constructing a deepwater underwater grouting dedicated platform device according to claim 1, characterized in that: The platform construction machinery includes drilling rigs and grouting equipment.

7. The method for constructing a deepwater underwater grouting dedicated platform device according to claim 1, characterized in that: The draft depth h1 of the closed hollow box is 1.0-1.2 m.

8. The method for constructing a deepwater underwater grouting dedicated platform device according to claim 1, characterized in that: The enclosed hollow box is a steel hollow box.

9. The method for constructing a deepwater underwater grouting dedicated platform device according to claim 1, characterized in that: The top and bottom of the closed hollow box are respectively provided with an exhaust hole and a drain hole.

10. A method for constructing a deepwater underwater grouting dedicated platform device according to any one of claims 1 to 9, characterized in that: The connecting support structure includes floating body connecting steel, connecting steel bars, a floor and a railing; the connecting steel bars are symmetrically arranged in two rows and welded to the enclosed hollow boxes; the enclosed hollow boxes are connected horizontally and vertically by the connecting steel bars; the floor is laid on the floating body structure; the railing is arranged on the inner side of the two rows of connecting steel bars.

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