A method for constructing a special platform device for deep-water underwater grouting

Abstract

The present invention provides a method for constructing a special platform device for deepwater underwater grouting, which belongs to the technical field of leakage treatment in water conservancy projects. The method comprises the following steps: 1) constructing a buoyancy structure size calculation model taking into account surge height; 2) constructing a cable logarithm calculation model for resisting level 8 wind load; 3) determining the required number n of enclosed hollow boxes, 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 based on the buoyancy structure size calculation model and the cable logarithm calculation model for resisting level 8 wind load; 4) according to the structural size and number of the enclosed hollow boxes and the number of cable logarithms determined in step 3), connecting the multiple enclosed hollow boxes into one by using a connecting support structure; and fixing the floating structure to surrounding fixed objects by using cables. The platform device constructed by the method of the present invention can not only provide a construction platform for drilling rigs, grouting equipment, materials, frogmen diving, and workers' operations, but also can adapt to the working environment of reservoir water level changes and level 8 wind and wave, realizing 24-hour underwater grouting operations all day long, making large-scale underwater drilling and grouting in front of the dam in the reservoir as easy as walking on flat ground.

Description

Technical Field

[0001] The present 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] Dams, under the long-term impact of reservoir water, experience frequent and recurring leakage, posing a significant challenge to reservoir safety. Dam failures due to leakage are the leading cause of dam failures. Managing leakage without draining the reservoir dam is a key challenge facing the industry, specifically the ability to conduct large-scale underwater grouting to plug leaks in water depths exceeding 60 meters.

[0003] Traditional deepwater grouting operations require frequent dives, using air or hybrid diving, resulting in extremely low efficiency and making large-scale underwater drilling and grouting difficult to implement. Therefore, there is an urgent need to develop a dedicated deepwater grouting platform that can provide a construction platform for drilling rigs, grouting equipment, materials, frogmen, and workers, while also adapting to reservoir water level fluctuations and working environments with force 8 winds and waves. Ultimately, this would enable 24 / 7 underwater grouting operations, making large-scale underwater drilling and grouting in front of the reservoir dam as easy as plying a flat surface. 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, realizing 24-hour all-weather underwater grouting operations, 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 dedicated platform device for deepwater underwater grouting, wherein the platform device comprises a floating structure, a connecting support structure, and a wind load resistant structure; the floating structure comprises n closed hollow boxes, the connecting support structure is used to connect the floating structures into a whole, and the wind load resistant structure comprises cables 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] 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％ 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 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, 1000 kg / m 3 ; g is the acceleration due to gravity, 9.8N / kg;

[0009] 2) Construct a logarithmic calculation model for cables resistant to level 8 wind loads:

[0010]

[0011] Where 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;

[0012] 3) 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 pairs based on the buoyancy structure size calculation model and the cable pair calculation model for resisting level 8 wind loads;

[0013] 4) Based on the structural dimensions, quantity, and number of cable pairs of the enclosed hollow boxes determined in step 3), the plurality of enclosed hollow boxes are connected into one by using the connecting support structure, and the floating structure is fixed to surrounding fixed objects with cables.

[0014] Furthermore, the surge height coefficient α is 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 to a value of 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 drilling rigs and grouting equipment.

[0019] Furthermore, the draft depth h1 of the closed hollow box is 1.0 to 1.2 m.

[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 drainage hole.

[0022] Furthermore, the connecting support structure includes floating connecting steel, connecting steel bars, a floor and a railing; the connecting steel bars are symmetrically arranged in two rows and welded to the closed hollow boxes; the closed hollow boxes are connected horizontally and vertically by the connecting steel bars; the floor is laid on the floating 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 dedicated deepwater underwater grouting platform device of the present invention determines the structural dimensions, quantity, and number of cable pairs of the enclosed hollow box by constructing a buoyancy structure dimension calculation model that takes into account surge height and a cable pair calculation model that resists force 8 wind loads. This allows the platform device of the present invention to achieve 24 / 7 large-scale underwater drilling and grouting operations under the influence of fluctuating reservoir water levels and force 8 wind waves, ensuring safe and stable construction. This makes large-scale underwater drilling and grouting in front of the reservoir dam as easy as walking on flat ground, improving the efficiency of deepwater underwater grouting operations. The platform device constructed using the method of the present invention can provide a construction platform for drilling rigs, grouting equipment, materials, as well as for frogmen diving and workers. It has excellent application prospects and is suitable for underwater grouting of reservoir dams up to 60 meters deep. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0026] Figure 1 This is a schematic diagram of the overall structure of a dedicated deepwater underwater grouting platform device provided in Example 1 of the present invention;

[0027] Figure 2 for Figure 1 A side structural diagram of

[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 figures 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 intended 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", "an", "the" 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 otherwise.

[0035] The terms "first" and "second" are used solely for descriptive purposes to distinguish objects, such as substances, from one another and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to. For example, a first XX could also be referred to as a second XX, and similarly, a second XX could also be referred to as a first XX, without departing from the scope of the embodiments of the present invention. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of such features.

[0036] The embodiment of the present invention provides a method for constructing a deepwater underwater grouting dedicated platform device, 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 sealed 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 cables 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] 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％ 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 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, 1000 kg / m 3 ; g is the acceleration due to gravity, 9.8N / kg;

[0040] 2) Construct a logarithmic calculation model for cables resistant to level 8 wind loads:

[0041]

[0042] Where 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;

[0043] 3) Based on the buoyancy structure size calculation model and the cable pair 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 pairs;

[0044] 4) Based on the structural dimensions, quantity, and number of cable pairs of the enclosed hollow boxes determined in step 3), a connecting support structure is used to connect the multiple enclosed hollow boxes into one, and cables are used to secure the floating structure to surrounding fixed objects.

[0045] In the above step 1), the buoyancy structure size calculation model constructed by 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 significantly impact the stability of the constructed platform device. Therefore, when constructing the buoyancy structure dimension calculation model, the embodiments of the present invention incorporate factors such as the surge height coefficient α and the reservoir water depth H of the platform device into the model to ensure the platform device's stability against surges during deepwater underwater grouting operations. α can be determined based on engineering practices such as the Northwest Estuary Project and can be selected between 0.8 and 1.0. Furthermore, the first safety factor k is determined based on engineering practice and can be between 1.1 and 1.2, specifically, 1.1.

[0046] The platform construction machinery of the embodiment of the present invention includes a drilling rig and grouting equipment. The sealed hollow box 1 can be made of steel. The draft h1 of the sealed hollow box 1 can be between 1.0 and 1.2 meters, specifically 1.0 meters. The top and bottom of the sealed hollow box 1 are respectively provided with an exhaust hole 101 and a drain hole 102.

[0047] According to the buoyancy structure size calculation model constructed according to the embodiment of the present invention, the structural size and number of the floating body 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 the cable that can resist level 8 wind load to ensure the stability of the platform device under level 8 wind load, 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 level 8 wind and waves.

[0049] The second safety factor δ is determined based on engineering practice and can be between 1.1 and 1.2, specifically, 1.15. The value of p is generally 200 Pa. F1 is related to the cable diameter; the larger the diameter, the greater the cable's breaking strength. The angle β between the cable and the main wind direction on the water surface is between 0° and 90°. The main wind direction on the operating water surface of the platform device is determined based on the specific project. The cable layout should be parallel to the main wind direction as much as possible or intersect at a small angle. The number of cable pairs required and their diameter are inversely proportional. The more cable pairs there are, the smaller their diameter and the lower the breaking strength of a single pair of cables. Conversely, the larger the diameter, the lower the breaking strength of a single pair of cables.

[0050] The embodiment of the present invention determines the required structural size, quantity and number of cable pairs of the enclosed hollow box based on 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 connecting steel 2, connecting steel bars 3, a floor and a railing 4; the connecting steel bars 2 are symmetrically arranged in two rows and welded to the closed hollow box 1; the closed hollow boxes 1 are connected horizontally and vertically by connecting 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 connecting steel bars 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 assembly comprises a floating structure, a connecting support structure, and a wind load-resistant structure. The floating structure consists of n sealed hollow boxes 1, which ensure the platform assembly floats stably on the water surface. The structural dimensions, number, and spacing of the floating structure are determined based on the specific project and by the buoyancy structure dimension calculation model constructed in the embodiments of the present invention. Each sealed hollow box 1 is provided with an exhaust vent 101 and a drain vent 102, located at the top and bottom, respectively, and an anemometer 5 is located on its upper portion. The connecting support structure comprises floating connecting steel sections 2, connecting steel bars 3, a floor, and railings 4. The floor, which can be made of wooden planks, serves to connect the sealed hollow boxes 1 into a single unit and provide a work surface for construction equipment and personnel. The connecting steel sections 2 are double-row, model I20, welded to the sealed hollow boxes 1. The sealed hollow boxes 1 are connected by horizontal and vertical connecting steel bars 3, each with a diameter of 28 mm and a spacing of 20 cm. Wooden planks are laid on top to facilitate the deployment of construction equipment and 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 columns are spaced 56cm apart, and three φ25 steel pipes are placed between the columns. The wind load-resistant structure primarily consists of cables, which connect the platform device to the surrounding mountain or dam structure. To ensure the stability of the platform under a force 8 wind load, the specific project requirements must be considered, and the force 8 wind load-resistant cable logarithm calculation model constructed in accordance with the present invention is used 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 dedicated deepwater underwater grouting platform device, comprising the following steps:

[0054] 1. Based on 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. Based on the buoyancy structure size calculation model constructed above that takes surge height into consideration, 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 a total station, place n floating closed steel hollow boxes on the water in sequence according to the direction of the curtain grouting axis, with the box tubes arranged in a direction parallel to the curtain grouting axis.

[0057] 4. Place double rows of connecting steel sections on the floating structure. The connecting steel sections are parallel to the curtain grouting axis and are located on both sides of the curtain grouting axis, with a distance of 4m from the axis. Connect each closed steel hollow box floating structure into a whole by welding.

[0058] 5. The enclosed 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 welded to the floating body's enclosed steel hollow box or 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 as much as possible or intersect with it at a small angle. Calculate the wind load and pressure of level 8.

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

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

[0063] The embodiment of the present invention addresses the current situation in which 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 invention invents a method for constructing a special platform device for deep-water grouting. The platform device constructed using 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 operations 24 hours a day under the influence of changes in reservoir water level and 8-level wind and waves, and ensure construction safety and stability, making large-scale underwater drilling and grouting in front of the dam in the reservoir as easy as walking on flat ground, thereby improving the operational efficiency of deep-water underwater grouting.

[0064] The above embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A method for constructing a deepwater underwater grouting platform device, 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％ 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, 1000 kg / m 3 ; g is the acceleration due to gravity, 9.8N / kg; 2) Construct a logarithmic calculation model for cables resistant to level 8 wind loads: Where 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) 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 pairs based on the buoyancy structure size calculation model and the cable pair calculation model for resisting level 8 wind loads; 4) Based on the structural dimensions, quantity, and number of cable pairs of the enclosed hollow boxes determined in step 3), the plurality of enclosed hollow boxes are connected into one by using the connecting support structure, and the floating structure is fixed to 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 set to a value of 1.1 to 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 to be 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 sealed 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 sealed hollow box are respectively provided with an exhaust hole and a drainage 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 connecting steel, connecting steel bars, a floor and a railing; the connecting steel bars are symmetrically arranged in two rows and welded to the closed hollow boxes; the closed hollow boxes are connected horizontally and vertically by the connecting steel bars; the floor is laid on the floating structure; and the railing is arranged on the inner side of the two rows of connecting steel bars.

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