Construction device and method for leveling supporting cushion concrete cushion block of underwater pouring structure

Abstract

The invention discloses an underwater cushion block construction device and method for a leveling supporting cushion of an underwater pouring structure. A platform top plate of a supporting platform is supported to a seabed surface on the outer side of a pouring area through three supporting legs, and the platform top plate is exposed out of the water surface; the positioning steel pipe is movably arranged on the platform top plate and provided with a vertically-through concrete pouring channel. And the lower hanging template is sleeved outside the positioning steel pipe in a height position adjustable manner. In the construction process, the supporting platform is supported on the seabed surface outside a pouring area through the three supporting legs; carrying out attitude measurement and adjustment on the positioning steel pipe; the lower hanging template is downwards pressed on the bottom support steel plate, so that a closed pouring space is defined; the concrete is conveyed into the pouring space along the inner guide pipe until the pouring space is full; and after the concrete in the lower hanging template is initially set, the lower hanging template is lifted, and the supporting platform is moved, so that the implantation precision requirement of a structure can be met, underwater operation is replaced, time is saved, and construction safety is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of underwater concrete pouring construction, and in particular provides a construction method for a concrete pad block used for leveling and supporting a structure of an underwater pouring. Background Art

[0002] In recent years, the construction progress of large-scale underwater structures has been accelerating, such as large underwater caissons, caissons, immersed pipes, and large cofferdams with weirs first and piles later. These underwater structures are generally processed and manufactured in factories or docks first, and the riverbed or seabed at the construction site is excavated at the same time. After the excavation of the foundation pit is completed, the above-mentioned structures are transported to the construction site by floating, shipping, etc. and sinking operations are carried out.

[0003] After a long period of on-site construction, it was found that the sinking operation faced two problems: on the one hand, the flatness of the bottom of the riverbed and seabed foundation pit after excavation was poor and could not meet the requirements for the placement of structures such as caissons; on the other hand, due to the limitations of current technical means, it is impossible to carry out high-precision measurement of the elevation of the bottom of the foundation pit after excavation, and it is generally impossible to pre-level the bottom of the foundation pit before the caisson is placed.

[0004] In view of the above two reasons, the commonly used leveling method at present is to order divers to carry out underwater padding of caissons and other structures when the caisson is implanted, so as to achieve the purpose of leveling the caissons and other structures. However, this wastes a lot of manpower and material resources, and the leveling effect is greatly affected by factors such as wind, waves and currents, and it is easy to miss the implantation window period, which is not conducive to construction control and safety. Summary of the invention

[0005] Based on this, the present invention provides a construction device and method for leveling and supporting concrete pads for underwater cast structures, which carry out construction preparations before casting on the water surface, build a casting space and a concrete conveying and casting channel for the underwater casting area, cast concrete into the underwater casting area through the casting channel on the water surface, and construct underwater concrete pads whose plane position and elevation can meet the caisson bed requirements, so as to replace underwater construction operations, save time and ensure construction safety.

[0006] In order to achieve the above-mentioned purpose, in the first aspect, the present invention provides a construction device for leveling and supporting concrete pads for underwater cast structures, comprising a supporting platform, a positioning steel pipe and a hanging formwork; the bottom array of the platform top plate of the supporting platform is provided with three legs, each of the legs extends downward and supports the seabed surface outside the casting area, and the platform top plate is exposed above the water surface; the positioning steel pipe is movably arranged in the central hole of the platform top plate and the lower end extends toward the casting area at the bottom of the water, and a concrete casting channel which passes through from top to bottom is arranged inside the positioning steel pipe; the hanging formwork is arranged on the outside of the positioning steel pipe with an adjustable height position to construct a concrete casting space in the casting area below the positioning steel pipe.

[0007] Furthermore, the support platform is provided with an adjustment mechanism for driving the positioning steel pipe to adjust its posture, the adjustment mechanism comprises a first adjustment group and a second adjustment group arranged with an upper and lower interval, and a synchronous control system is control-connected to the first adjustment group and the second adjustment group to control the coordinated action of the two adjustment groups to adjust the posture of the positioning steel pipe.

[0008] Furthermore, the first adjustment group includes three first jacks arranged in a circular array between the platform top plate and the positioning steel pipe, one end of each of the first jacks is hinged to the platform top plate, and the other end is hinged to the positioning steel pipe, and the synchronous control system is configured to control the coordinated actions of the first jacks to adjust the upper end posture of the positioning steel pipe.

[0009] Furthermore, the second adjustment group includes three second jacks arranged in a circular array between the support legs and the positioning steel pipe, one end of each of the second jacks is hinged to the support legs, and the other end is hinged to the positioning steel pipe, and the synchronous control system is configured to control the coordinated actions of the second jacks to adjust the posture of the lower end of the positioning steel pipe.

[0010] Furthermore, the positioning steel pipe includes an outer steel pipe, an inner guide tube and a fixing rod. The inner guide tube is centrally arranged in the outer steel pipe and serves as a concrete pouring channel. The upper end of the inner guide tube is connected to a hopper, and the lower end is flush with the bottom of the inner guide tube. The fixing rod is arranged between the outer steel pipe and the inner guide tube at intervals along the length direction.

[0011] Furthermore, the lower hanging formwork is movably sleeved outside the outer steel pipe, a radially outwardly extending bottom supporting steel plate is provided at the bottom of the outer steel pipe, and the inner conduit extends downward from the center hole of the bottom supporting steel plate.

[0012] Furthermore, two winches are symmetrically arranged on the platform top plate outside the central hole, and the steel ropes wound by the respective winches are symmetrically connected to the two sides of the lower hanging formwork.

[0013] Furthermore, the lower hanging formwork includes a keel frame arranged in a horizontal plane, and the outer peripheral array of the keel frame is provided with vertical guide holes, and a movable steel strip is slidably provided in each vertical guide hole. The movable steel strip, the lower hanging formwork, and the seabed surface of the underwater pouring area are enclosed to form a concrete pouring space, and the lower end of the concrete pouring channel is connected to the top of the concrete pouring space.

[0014] In order to achieve the above object, in a second aspect, the present invention provides a construction method for casting a concrete pad for leveling a structure in water, characterized in that it comprises: S100. The floating crane lifts the support platform and lowers it to the water surface of the concrete pad casting area. The support platform is supported on the seabed surface outside the casting area by three legs; S200. The plane position, elevation and verticality of the top of the positioning steel pipe are measured; according to the measurement results, the positioning steel pipe is adjusted by three first jacks and three second jacks so that its plane position, elevation and verticality meet the requirements, and the plane position, top elevation and verticality of the top of the positioning steel pipe determine the plane position and top elevation of the concrete pad to be poured; S300. When the positioning steel pipe is adjusting its posture, the lower hanging formwork is in a lifted state. After the positioning steel pipe is adjusted, the winch pulls the steel rope to lower the hanging formwork until the keel frame of the lower hanging formwork is pressed on the bottom supporting steel plate under the action of its own weight. At this time, the movable steel plate strips of the lower hanging formwork are lifted and lowered in accordance with the terrain, enclosing the area to form a closed pouring space; S400. Pour the mixed concrete into the hopper at the end of the positioning steel pipe, and the concrete is transported along the inner conduit into the pouring space until it is full; S500. After the concrete inside the lower hanging formwork has initially solidified, the winch will lift the lower hanging formwork, and the floating crane will shift the supporting platform to complete the construction of the underwater concrete pad.

[0015] Furthermore, the bottom of each leg is sealed with a pipe fitting, and the platform top plate is provided with a concrete pouring hole connected to the top of the leg. After the supporting platform is supported on the seabed surface outside the casting area by the three legs, counterweight concrete is poured into the bottom of the three legs through the concrete pouring hole, so that the center of gravity of the supporting platform moves downward to form a stable supporting structure.

[0016] Compared with the prior art of placing the formed pad as a whole underwater and having divers dive underwater to perform support adjustment, the technical advantages of the construction device and method for casting structural leveling support concrete pads in water are at least reflected in: 1. The support platform is supported by three legs to the seabed surface outside the pouring area, so that the top plate of the platform is exposed to the water surface and is located directly above the underwater pouring area. As an above-water platform for subsequent measurement and construction, the posture parameters of the bottom close to the positioning steel pipe are monitored on the top plate of the platform by the height and angle of the positioning steel pipe exposed to the water surface, and the bottom of the positioning steel pipe reaches the set position and angle according to the monitoring parameters, and then the hanging template is lowered along the positioning steel pipe to establish a pouring space, and concrete is poured into the pouring space through the pouring channel in the positioning steel pipe on the top plate of the platform, and underwater concrete pads whose plane position and elevation can meet the requirements of caisson placement are constructed, so as to replace the existing technology of lowering the formed pads into the water and then diving underwater for support adjustment, which can save time and ensure construction safety; 2. The upper end of the positioning steel pipe is set in the central hole of the supporting platform. The first adjustment group and the second adjustment group arranged at intervals are respectively provided with three jacks. The synchronous control system controls the coordinated actions of the jacks to accurately position the angle of the steel pipe. The positioning steel pipe is extended from the water surface to facilitate monitoring of the state of the underground part, making the monitoring and adjustment operations simple. It is also convenient to lower the hanging template along the positioning steel pipe through the winch to construct the underwater pouring space. The construction process is coherent and convenient, and is suitable for construction occasions with high precision requirements. 3. The winch 5 arranged on the top plate of the platform can accurately control the upgrading height of the lower hanging formwork 3 along the positioning steel pipe 2, and the keel frame 15 of the lower hanging formwork is externally provided with a movable steel springboard that can be lifted and lowered freely, which can adapt to the shape of various seabed surfaces 17 and construct a complete concrete pouring space. Then, cement is poured through the through cavity inside the positioning steel pipe to prefabricate a concrete pad structure that meets the composite requirements, which replaces the divers embedded in the water for leveling operations, reduces the difficulty of operation and improves the construction speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments of the present disclosure will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0018] Figure 1 It is a schematic diagram of the structure of an embodiment of a construction device provided for leveling and supporting concrete pads for pouring structures in water; Figure 2 yes Figure 1 A schematic cross-sectional view along the Ⅰ-Ⅰ viewing direction; Figure 3 Figure 1 A schematic cross-sectional view along the II-II viewing direction; Figure 4 yes Figure 1 A local enlarged schematic diagram of point A; Figure 5 yes Figure 4 Schematic diagram along the III-III viewing direction; Figure 6 The invention is a flowchart of an embodiment of a construction method for casting structural leveling support concrete pads in water.

[0019] Description of the accompanying drawings: 1- platform top plate, 2- positioning steel pipe, 3- lower hanging formwork, 4- first jack, 5- winch, 6- steel rope, 7- outrigger, 8- second jack, 9- counterweight concrete, 10- outer steel pipe, 11- inner guide tube, 12- fixing rod, 13- hopper, 14- bottom supporting steel plate, 15- keel frame, 16- movable steel slats, 17- seabed surface.

[0020] It should be understood that the size of each part shown in the accompanying drawings is not drawn according to the actual proportional relationship. In addition, the same or similar reference numerals represent the same or similar components. DETAILED DESCRIPTION

[0021] At present, underwater structures are generally manufactured on land first, then floated to the construction site and sunk. The bottom of the foundation pit is pre-leveled before the caisson is implanted. Diving is usually used to carry out underwater padding of caissons and other structures, so as to achieve the purpose of leveling caissons and other structures. This consumes a lot of manpower and material resources, and the leveling effect is greatly affected by factors such as wind, waves and currents, and it is easy to miss the implantation window period, which is not conducive to construction control and safety.

[0022] To this end, the patent of the present invention discloses an underwater pad construction device and method for leveling pads for casting structures in water. The top plate of the supporting platform is supported to the seabed surface outside the casting area by three legs, and the top plate of the platform is exposed above the water surface; the positioning steel pipe is movably arranged on the top plate of the platform and is provided with a concrete casting channel that passes through from top to bottom; the height of the lower hanging template is adjustable and sleeved outside the positioning steel pipe. During the construction process, the supporting platform is supported on the seabed surface outside the casting area by three legs; the positioning steel pipe is measured and adjusted; the lower hanging template is lowered and pressed down on the bottom supporting steel plate to enclose a closed casting space; the concrete is transported to the casting space along the inner guide tube until it is full; after the concrete inside the lower hanging template is initially solidified, the lower hanging template is lifted and the supporting platform is shifted, which can meet the caisson bed requirements, replace underwater operations, save time and ensure construction safety.

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, 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. Embodiment 1

[0024] like Figure 1As shown, the present invention provides a construction device for leveling and supporting concrete pads for underwater casting structures, comprising a supporting platform, a positioning steel pipe 2 and a lower hanging formwork 3. The bottom of the platform top plate 1 of the supporting platform is provided with three legs 7 in an array, each of which extends downward and supports the seabed surface 17 outside the casting area, and the platform top plate 1 is exposed above the water surface; the positioning steel pipe 2 is movably arranged in the center hole of the platform top plate 1 and the lower end extends toward the casting area at the bottom of the water, and a concrete casting channel is provided inside the positioning steel pipe 2 that passes through from top to bottom; the lower hanging formwork 3 is sleeved outside the positioning steel pipe 2 with an adjustable height position to construct a concrete casting space in the casting area below the positioning steel pipe 2.

[0025] During the construction process, the floating crane hoists the entire device to the pad casting area, and then uses the supporting platform as the foundation and uses a jack to fine-tune the positioning steel pipe 2, adjust the plane position, verticality and top and bottom elevations of the positioning steel pipe 2, and then use the winch 5 to lower the hanging formwork 3 until it contacts the riverbed or seabed, and finally pour underwater concrete along the conduit in the positioning steel pipe 2. After initial setting, the winch is used to lift the hanging formwork 3 to complete the prefabrication of the prefabricated blocks. This device can realize high-precision construction of underwater leveling support pads.

[0026] The supporting platform is supported by three legs 7 to the seabed surface 17 outside the casting area, so that the platform top plate 1 is exposed to the water surface and is located directly above the underwater casting area, serving as an above-water platform for subsequent measurement and construction. On the platform top plate 1, the posture parameters of the bottom close to the positioning steel pipe are monitored by the height and angle of the positioning steel pipe 2 exposed to the water surface, and the monitoring parameters are followed until the bottom of the positioning steel pipe 2 reaches the set position and angle, and then the hanging formwork 3 is lowered along the positioning steel pipe 2 to establish a casting space, and concrete is poured into the casting space through the casting channel in the positioning steel pipe 2 on the platform top plate 1, to construct an underwater concrete pad whose plane position and elevation can meet the caisson bed requirements, so as to replace the existing technology of lowering the formed pad into the water and submerging it into the water for support adjustment, which can save time, ensure construction safety and improve construction quality. Embodiment 2

[0027] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, based on Example 1, the structure is optimized to achieve accurate and efficient leveling of the positioning steel pipe on water. Specifically, the support platform is provided with an adjustment mechanism for driving the positioning steel pipe 2 to adjust its posture, and the adjustment mechanism includes a first adjustment group and a second adjustment group arranged at intervals in the upper and lower parts, and a synchronous control system is connected to the first adjustment group and the second adjustment group to control the coordinated action of the two adjustment groups to adjust the posture of the positioning steel pipe 2.

[0028] The first adjustment group includes three first jacks 4 arranged in a circular array between the platform top plate 1 and the positioning steel pipe 2, one end of each of the first jacks 4 is hinged to the platform top plate 1, and the other end is hinged to the positioning steel pipe 2, and the synchronous control system is configured to control the coordinated actions of the first jacks 4 to adjust the upper end posture of the positioning steel pipe 2.

[0029] The second adjustment group includes three second jacks 8 arranged in a circular array between the support legs 7 and the positioning steel pipe 2. One end of each of the second jacks 8 is hinged to the support legs 7, and the other end is hinged to the positioning steel pipe 2. The synchronous control system is configured to control the coordinated actions of the second jacks 8 to adjust the posture of the lower end of the positioning steel pipe 2.

[0030] Based on the above embodiment, the upper end of the positioning steel pipe 2 is arranged in the central hole of the supporting platform, and the first adjustment group and the second adjustment group arranged at intervals up and down are respectively provided with three jacks. The coordinated actions of the jacks are controlled by the synchronous control system, so that the angle of the positioning steel pipe 2 can be accurately determined, and the setting of the positioning steel pipe 2 extending out from the water surface facilitates the monitoring of the status of the underground part, making the monitoring and adjustment operations simple. Embodiment 3

[0031] The structure is optimized on the basis of the first and second embodiments to improve the efficiency and accuracy of the casting space construction and casting operation after adjusting and positioning the steel pipes.

[0032] like Figure 1 and Figure 4 As shown, the positioning steel pipe 2 includes an outer steel pipe 10, an inner conduit 11 and a fixing rod 12. The inner conduit 11 is centrally arranged in the outer steel pipe 10 and serves as a concrete pouring channel. The upper end of the inner conduit 11 is connected to a hopper 13, and the lower end is flush with the bottom of the inner conduit 11. The fixing rod 12 is arranged between the outer steel pipe 10 and the inner conduit 11 at intervals along the length direction. The lower hanging template 3 is movably sleeved outside the outer steel pipe 10. A radially outwardly extending bottom support steel plate 14 is provided at the bottom of the outer steel pipe 10. The inner conduit 11 extends downward from the center hole of the bottom support steel plate 14.

[0033] The platform top plate 1 is symmetrically provided with two winches 5 outside the center hole, and the steel ropes 6 wound by each winch 5 are symmetrically connected to the two sides of the lower hanging template 3. It is convenient to lower the lower hanging template 3 along the positioning steel pipe 2 by the winch 5 to construct an underwater pouring space, and then pour cement through the through cavity inside the positioning steel pipe 2. The process is coherent and convenient, and is suitable for construction occasions with high precision requirements.

[0034] like Figure 5As shown, the lower hanging formwork 3 includes a keel frame 15 arranged in a horizontal plane, and the outer peripheral array of the keel frame 15 is provided with vertical guide holes, and a movable steel strip is slidably provided in each vertical guide hole. The movable steel strip, the lower hanging formwork 3, and the seabed surface 17 of the underwater pouring area enclose a concrete pouring space, and the lower end of the concrete pouring channel is connected to the top of the concrete pouring space.

[0035] By means of the winch 5 arranged on the top plate of the platform, the upgrading height of the lower hanging formwork 3 along the positioning steel pipe 2 can be accurately controlled, and the keel frame 15 of the lower hanging formwork is externally provided with a movable steel springboard which can be lifted and lowered freely, and can adapt to the shapes of various seabed surfaces 17 to construct a complete concrete pouring space.

[0036] like Figure 6 As shown, based on the above embodiments, the present invention provides a construction method for a concrete pad for leveling and supporting a structure cast in water, comprising: S100. The floating crane lifts the support platform and lowers it to the water surface of the concrete pad casting area. The support platform is supported on the seabed surface 17 outside the casting area by three legs 7; S200. The plane position, elevation and verticality of the vertex of the positioning steel pipe 2 are measured and adjusted so that the plane position, elevation and verticality meet the requirements, and the plane position and top elevation of the concrete pad to be poured are determined; S300. When the positioning steel pipe 2 adjusts its posture, the lower hanging template 3 is in a lifted state. After the positioning steel pipe 2 is adjusted, the winch 5 pulls the steel rope 6 to lower the hanging template 3 until the keel frame 15 of the lower hanging template 3 is pressed on the bottom supporting steel plate 14 under the action of its own weight. At this time, the movable steel plate strips 16 of the lower hanging template 3 are lifted and lowered in accordance with the terrain, enclosing the area to form a closed casting space; S400. The mixed concrete is poured into the hopper 13 at the end of the positioning steel pipe 2, and the concrete is transported along the inner conduit to the pouring space until it is full; S500. After the concrete inside the lower hanging formwork 3 is initially solidified, the winch 5 lifts the lower hanging formwork 3, and the floating crane shifts the supporting platform to complete the construction of the underwater concrete pad.

[0037] Carry out construction preparations before pouring on the water surface, build pouring space and concrete transportation and pouring channels in the underwater pouring area, pour concrete into the underwater pouring area through the pouring channels on the water surface, and build underwater concrete pads whose plane position and elevation can meet the caisson bed requirements to replace underwater construction operations, save time and ensure construction safety, which can meet the caisson bed requirements.

[0038] The bottom of each leg 7 is sealed with a pipe fitting, and the platform top plate 1 is provided with a concrete pouring hole connected to the top of the leg 7. After the supporting platform is supported on the seabed surface 17 outside the casting area by the three legs 7, counterweight concrete 9 is poured into the bottom of the three legs 7 through the concrete pouring hole, so that the center of gravity of the supporting platform moves downward to form a stable supporting structure. Embodiment 4

[0039] In order to more clearly illustrate the technical solution of the present invention, the solution is described below in conjunction with specific embodiments.

[0040] like Figures 1 to 5 As shown, in the specific implementation process, the present invention provides a construction device for leveling and supporting concrete pads for pouring structures in water, including a support platform 1, a positioning steel pipe 2, a lower hanging formwork 3, a jack 4, a winch 5, and a steel rope 6. The support platform 1 is welded from steel pipes, including three legs 7, a parallel diagonal brace 8, and concrete in the pipe 9. The positioning steel pipe 2 includes an outer steel pipe 10, an inner guide tube 11, an inner guide tube fixing rod 12, a hopper 13, and a bottom supporting steel plate 14. The lower hanging formwork 3 includes a keel frame 15 and movable steel plate strips 16. The support platform 1 and the positioning steel pipe 2 are connected by a jack 4, and the lower hanging formwork 3 is sleeved on the positioning steel pipe 4 and connected to the winch 5 by a steel rope 6.

[0041] During operation, the entire device is first lifted by a floating crane and placed in the concrete pad casting area. The entire device relies on the support platform 1, and the platform is supported at the bottom of the foundation pit by three legs 7. Concrete 9 is poured at the bottom of the legs to move the center of gravity of the support platform 1 downward, making the structure more stable. The three legs are connected as a whole through two layers of parallel diagonal braces 8.

[0042] Because the bottom of the foundation pit is uneven, the entire device is in a tilted state. The plane position, elevation and verticality of the top of the positioning steel pipe 2 are measured, and according to the measurement results, the positioning steel pipe is adjusted using a total of 6 jacks 4 on two layers to make its plane position, elevation and verticality meet the requirements. The 6 jacks are located on the upper and lower operating platforms, and the synchronous control system can be used to adjust any posture of the positioning steel pipe. The plane position, top elevation and verticality of the top of the positioning steel pipe determine the plane position and top elevation of the concrete pad to be poured.

[0043] When the positioning steel pipe 2 adjusts its posture, the lower hanging formwork 3 is in a lifted state. After the positioning steel pipe 2 is adjusted, the lower hanging formwork is lowered by pulling the steel rope 6 with the winch 5 until the keel frame 15 of the lower hanging formwork is pressed on the bottom supporting steel plate 14 under the action of its own weight. At this time, the movable steel strips 16 of the lower hanging formwork rise and fall in accordance with the terrain, enclosing the area into a closed system. Then, pour the mixed concrete into the hopper at the end of the positioning steel pipe 2, and the concrete falls into the lower hanging formwork 3 along the inner guide tube 11 fixed by the inner guide tube fixing rod 12 until it fills the area. After the concrete inside the lower hanging formwork is initially solidified, the lower hanging formwork 3 is lifted by the winch 5, and the floating crane shifts the device to complete the construction of the underwater concrete pad.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A construction device for leveling and supporting concrete pads for pouring structures in water, characterized in that: It includes a supporting platform, a positioning steel pipe (2) and a lower hanging formwork (3); The platform top plate (1) of the support platform is provided with three legs (7) in an array at the bottom, each of the legs (7) extending downward and supporting the seabed surface (17) outside the casting area, and the platform top plate (1) is exposed above the water surface; The positioning steel pipe (2) is movably arranged in the central hole of the platform top plate (1) and the lower end thereof extends toward the pouring area at the bottom of the water, and a concrete pouring channel which passes through from top to bottom is arranged inside the positioning steel pipe (2); The lower hanging formwork (3) is arranged outside the positioning steel pipe (2) in a height-adjustable manner so as to construct a concrete pouring space in the pouring area below the positioning steel pipe (2).

2. The construction device for leveling and supporting concrete pads for underwater casting structures according to claim 1 is characterized in that: The support platform is provided with an adjustment mechanism for driving the positioning steel pipe (2) to adjust its posture, the adjustment mechanism comprising a first adjustment group and a second adjustment group arranged at an interval up and down, and a synchronous control system is connected to the first adjustment group and the second adjustment group to control the coordinated action of the two adjustment groups to adjust the posture of the positioning steel pipe (2).

3. The construction device for leveling and supporting concrete pads for underwater casting structures according to claim 2 is characterized in that: The first adjustment group comprises three first jacks (4) arranged in a circular array between the platform top plate (1) and the positioning steel pipe (2), one end of each of the first jacks (4) being hinged to the platform top plate (1) and the other end being hinged to the positioning steel pipe (2), and the synchronous control system being configured to control the coordinated actions of the first jacks (4) to adjust the posture of the upper end of the positioning steel pipe (2).

4. The construction device for leveling and supporting concrete pads for underwater casting structures according to claim 2 is characterized in that: The second adjustment group comprises three second jacks (8) arranged in a circular array between the support legs (7) and the positioning steel pipe (2), one end of each of the second jacks (8) being hinged to each of the support legs (7) and the other end being hinged to the positioning steel pipe (2), and the synchronous control system being configured to control the coordinated actions of each of the second jacks (8) to adjust the posture of the lower end of the positioning steel pipe (2).

5. The construction device for leveling and supporting concrete pads for underwater casting structures according to claim 1 or 2, characterized in that: The positioning steel pipe (2) comprises an outer steel pipe (10), an inner conduit (11) and a fixing rod (12); the inner conduit (11) is centrally arranged in the outer steel pipe (10) and serves as a concrete pouring channel; the upper end of the inner conduit (11) is connected to a hopper (13) and the lower end is flush with the bottom of the inner conduit (11); the fixing rod (12) is arranged at intervals between the outer steel pipe (10) and the inner conduit (11) along the length direction.

6. The construction device for leveling and supporting concrete pads for underwater casting structures according to claim 5 is characterized in that: The lower hanging template (3) is movably sleeved outside the outer steel pipe (10), a radially outwardly extending bottom support steel plate (14) is provided at the bottom of the outer steel pipe (10), and the inner conduit (11) extends downward from the center hole of the bottom support steel plate (14).

7. The construction device for leveling and supporting concrete pads for underwater casting structures according to claim 1 is characterized in that: The platform top plate (1) is symmetrically provided with two winches (5) outside the central hole, and the steel ropes (6) wound by the winches (5) are symmetrically connected to two sides of the lower hanging template (3).

8. The construction device for leveling and supporting concrete pads for underwater casting structures according to claim 1 or 7, characterized in that: The lower hanging formwork (3) comprises a keel frame (15) arranged on a horizontal plane, the outer periphery of the keel frame (15) is provided with a vertical guide hole array, each vertical guide hole is slidably provided with a movable steel strip plate, the movable steel strip plate and the lower hanging formwork (3) and the seabed surface (17) of the underwater casting area are enclosed to form a concrete casting space, and the lower end of the concrete casting channel is connected to the top of the concrete casting space.

9. A construction method for casting concrete pads for leveling structures in water, characterized in that: include: S100. The floating crane lifts the support platform and lowers it to the water surface of the concrete pad casting area. The support platform is supported on the seabed surface (17) outside the casting area by three legs (7); S200. The plane position, elevation and verticality of the vertex of the positioning steel pipe (2) are measured and adjusted so that the plane position, elevation and verticality meet the requirements, and the plane position and top elevation of the concrete pad to be poured are determined; S300. When the positioning steel pipe (2) is adjusting its posture, the lower hanging formwork (3) is in a lifted state. After the positioning steel pipe (2) is adjusted, the winch (5) pulls the steel rope (6) to lower the hanging formwork (3) until the keel frame (15) of the lower hanging formwork (3) is pressed on the bottom supporting steel plate (14) under the action of its own weight. At this time, the movable steel plate strips (16) of the lower hanging formwork (3) are lifted and lowered in accordance with the terrain, enclosing the area to form a closed pouring space; S400. Pour the mixed concrete into the hopper (13) at the end of the positioning steel pipe (2), and the concrete is transported along the inner conduit into the pouring space until it is full; S500. After the concrete inside the lower hanging formwork (3) has initially set, the winch (5) lifts the lower hanging formwork (3), and the floating crane shifts the supporting platform to complete the construction of the underwater concrete pad.

10. The construction method for leveling and supporting concrete pads for underwater casting structures according to claim 9, characterized in that: The bottom of each leg (7) is sealed with a pipe fitting, and the platform top plate (1) is provided with a concrete pouring hole connected to the top of the leg (7). After the support platform is supported on the seabed surface (17) outside the casting area by the three legs (7), counterweight concrete (9) is poured into the bottom of the three legs (7) through the concrete pouring hole, so that the center of gravity of the support platform moves downward, forming a stable support structure.

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