CN108468278B - The overall lowered underwater bearing platform construction structure - Google Patents

Abstract

An underwater pedestal construction structure that is lowered as a whole comprises at least a casing and a pedestal reinforcement skeleton in the casing, wherein the casing has a bottom plate, and a cushioning layer below the pedestal elevation is provided between the pedestal reinforcement skeleton and the bottom plate. The underwater pedestal construction structure also effectively avoids the conflict between the casing reinforcement and the pedestal reinforcement by extending the casing reinforcement. The underwater pedestal construction structure of the present invention is provided with a cushioning layer with supporting and waterproofing functions, which raises the internal structure of the casing by the cushioning layer to prevent the tide from penetrating into the casing, and can effectively resist the erosion of the tide from the bottom of the casing. The underwater pedestal construction structure of the present invention can be lowered as a whole, avoiding the tedious steps of on-site assembly and speeding up the construction process.

Description

The overall lowered underwater bearing platform construction structure

Technical Field

The invention mainly relates to the fields of building and bridge construction, and in particular to an integrally lowered underwater bearing platform construction structure suitable for underwater construction.

Background Art

In the construction of bridges across water bodies, it is often necessary to construct in the water area, which requires the application of underwater construction methods and construction techniques. At present, when constructing bridges in rivers, seas and other water bodies, it is necessary to consider hydrological factors such as the time of high tide, low tide, time interval between high tide and low tide, and tidal range. At high tide, the pier part of the bridge is submerged under the water surface. At low tide, the pier part is completely exposed above the water surface. Since there are many hydrological factors to consider, construction can only be carried out during the period of complete low tide, which is very short, resulting in delays in the construction period and inability to complete the construction task.

In response to this situation, the conventional method in the prior art is to first install and lower the casing, then seal the bottom of the casing, and then carry out the construction of the pedestal reinforcement. The method of the prior art results in that the bottom sealing concrete does not play a bottom sealing role at low tide. However, if the casing does not have bottom sealing concrete at high tide, the casing will be eroded by the tide.

On the other hand, during the underwater foundation construction, the pile foundation steel bars often conflict with the foundation steel bars in the casing, which will lead to problems such as inaccurate construction positioning. In addition, when the tide rises, the tide has a supporting effect on the bottom of the foundation structure due to buoyancy, affecting the stability of the foundation structure.

Summary of the invention

The present invention aims to provide a construction method for an underwater bearing platform construction structure, which can solve the above-mentioned problems.

The present invention provides an integrally lowered underwater pedestal construction structure, which at least comprises a casing and a pedestal reinforcement skeleton in the casing, wherein the casing has a bottom plate, and a cushioning layer below the pedestal elevation is provided between the pedestal reinforcement skeleton and the bottom plate.

Preferably, the height of the raised layer is 20 cm to 50 cm.

Preferably, the top edge of the foundation reinforcement skeleton is higher than the top edge of the preset casing reinforcement, and the casing reinforcement includes at least straight reinforcement and trumpet reinforcement.

More preferably, the straight steel bars and the horn steel bars are connected by at least one of welding, sleeves and binding; and/or the connection point between the straight steel bars and the horn steel bars is lower than the top boundary of the base reinforcement skeleton.

Further preferably, the sleeve connection method adopts at least one connection method of a straight thread sleeve, a tapered thread sleeve, and a cold-rolled sleeve.

More preferably, the bottom plate also includes cross-arranged load-bearing beams and distribution beams, which are erected on both sides of the casing steel bar distribution area, and some of the distribution beams are arranged in sections to avoid the casing steel bar distribution area.

Preferably, the bottom plate comprises a plurality of bottom plate units, and the casing steel bar holes on the bottom plate are formed by splicing at least two of the bottom plate units.

More preferably, the floor panel unit includes a main floor panel and side floor panels spliced to both sides of the main floor panel.

Preferably, the casing further comprises a side mold, and at least one layer of inner support perpendicular to the side mold is provided inside the side mold; and/or the inner support is connected to the side mold by a flange; and/or a stiffening plate is provided on the inner support.

More preferably, a positioning bracket for positioning the pier body reinforcement is also arranged on the inner support.

More preferably, the casing further comprises a surrounding wall mounted on the outside of the side mold, and the inner support and the corresponding surrounding wall are arranged on the same horizontal plane.

The present invention provides an integrally lowered underwater bearing platform construction structure, which can better solve some technical problems and has the following advantages:

(1) The present invention relates to an integrally lowered underwater foundation construction structure, which is provided with a cushioning layer with supporting and waterproofing functions. The cushioning layer is used to raise the internal structure of the casing to prevent the tide from penetrating into the casing, and can effectively resist the erosion of the tide from the bottom of the casing;

(2) The present invention relates to an integrally lowered underwater cap construction structure, in which straight steel bars and trumpet steel bars are connected to form casing steel bars by a connection method such as a straight threaded sleeve. By modifying the structure of the casing steel bars, the conflict problem between the casing steel bars and the underwater cap construction structure during the lowering process can be solved;

(3) The present invention relates to an integrally lowered underwater pedestal construction structure, which meets the needs of various bottom plates of different styles and sizes by assembling the bottom plate of the box. The bottom plate is connected by bolts and other means, and is assembled from multiple main bottom plates and side bottom plates, which has good adaptability;

(4) The present invention relates to an integrally lowered underwater foundation construction structure, in which the main bottom plate and the side bottom plate can be assembled to form a casing steel bar hole, which can be aligned with the casing and allow the casing steel bar to pass through. The design of assembling the casing steel bar hole avoids the steps of welding the steel plate and then cutting the hole, avoids the waste of materials, and can be recycled after the bottom plate is removed;

(5) The underwater cap construction structure involved in the present invention is lowered as a whole. The stability of the underwater cap construction structure is enhanced by providing an internal support. The internal support is also provided with a positioning bracket, which can position the internal steel bar structure such as the pier body steel bar and the cap steel bar skeleton, thereby improving the position accuracy and stability of the steel bar. Even during and after lowering, the steel bar structure will not change in a way that affects the project.

(6) In the overall lowered underwater pedestal construction structure involved in the present invention, the main bottom plate and the side bottom plate of the bottom plate are also provided with a stiffening structure (such as a rib plate), which can improve the bending resistance of the bottom plate, thereby greatly improving the load capacity of the bottom plate;

(7) The present invention relates to an underwater pedestal construction structure that is lowered as a whole, in which the casing is provided with a surrounding wall. The surrounding wall can be used alone or in combination with the internal support to enhance the stability of the underwater pedestal construction structure and enhance the structural strength.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and/or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

FIG1 is a schematic diagram of an integrally lowered underwater bearing platform construction structure of the present invention;

FIG2 is a bottom view of a bottom plate of an integrally lowered underwater bearing platform construction structure of the present invention;

FIG3 is a top view of the bottom plate of an integrally lowered underwater bearing platform construction structure of the present invention;

FIG4 is a cross-sectional view of a main bottom plate of an integrally lowered underwater bearing platform construction structure of the present invention;

FIG5 is an enlarged schematic cross-sectional view of the connection point A between the main bottom plate and the side bottom plate in FIG3 ;

FIG6 is a schematic diagram of a middle-layer inner support cutout of the underwater cap construction structure of the present invention;

FIG7 is a schematic diagram of the lowering of an underwater cap construction structure that is lowered as a whole according to the present invention, showing the underwater cap construction structure and casing;

FIG8 is a schematic diagram of the underwater cap construction structure and casing connection details in the present invention;

FIG9 is a partial enlarged schematic diagram of a beam support connected to a casing of an underwater cap construction structure of the present invention;

FIG10 is a partial enlarged schematic diagram of the B-B section of the beam support in FIG9 .

DETAILED DESCRIPTION

The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention. In order to facilitate the display of the actual construction structure of the underwater pedestal construction structure, the following embodiments will introduce an underwater pedestal and specific components to make the application and connection relationship of the underwater pedestal construction structure more fully displayed and easier to understand. It is worth noting that the scope of protection of the present invention is not limited.

Please refer to Figure 1, which shows the specific structure and connection relationship of an underwater pedestal construction structure 1. The underwater pedestal construction structure 1 mainly includes a casing 11, a cushioning layer 12, and a pedestal steel frame 13. The cushioning layer 12 and the pedestal steel frame 13 are located inside the casing 11, and the casing 11 has a bottom plate 111. The cushioning layer 12 is arranged between the pedestal steel frame 13 and the bottom plate 111, and is located below the bottom elevation of the pedestal steel frame 13. Specifically, the height of the cushioning layer 12 is 30 cm in this embodiment, and in other possible embodiments, the height of the cushioning layer 12 is between 20 cm and 50 cm. In this embodiment, the cushioning layer 12 is vertically covered with the cushioning layer 12 by the cushioning component-the horse stool reinforcement 121, and the horse stool reinforcement 121 is distributed in the area where the bottom plate 111 is located in the plane direction. The area where the cushioning layer 12 is located more specifically refers to the area between the pedestal steel frame 13 and the bottom plate 111.

More specifically, please continue to refer to Figure 1. Figure 1 shows the connection relationship between the underwater foundation construction structure 1 and other receiving mechanisms in actual construction. In this embodiment, a casing 2 is introduced, and the underwater foundation construction structure is suspended on the casing 2. Casing steel bars 24 are arranged in the circumferential direction of the casing 2, and the top edge of the foundation steel bar skeleton 13 is higher than the top edge of the preset casing steel bars 24, that is, the casing steel bars 24 are buried in the foundation steel bar skeleton 13.

More specifically, the casing steel bar 24 includes a straight steel bar 241, a sleeve connection component, a straight threaded sleeve 242, and a horn steel bar 243. The straight steel bar 241 and the horn steel bar 243 are connected by the straight threaded sleeve 242, thereby achieving the purpose of lengthening. In other possible implementations, the straight steel bar 241 and the horn steel bar 243 can also be connected or extended by welding, steel bar binding, or sleeve connection. In this embodiment, it is preferred to use a sleeve connection, especially a straight threaded sleeve 242 screw connection. In other possible implementations, the sleeve connection can also be achieved by using a tapered threaded sleeve, a cold-rolled sleeve, or other sleeves.

More specifically, the connection between the straight steel bar 241 and the trumpet steel bar 243 is lower than the highest point of the cap steel bar skeleton 13. In this embodiment, the connection (i.e., the connection position of the straight threaded sleeve 242) is lower than the top boundary of the cap steel bar skeleton 13, which also means that the end of the straight steel bar 241 is also lower than the top boundary of the cap steel bar skeleton 13. Since the casing steel bar 24 surrounds the casing 2 circumferentially, the casing steel bar 24 will appear trumpet-shaped or flower-shaped when observed as a whole. In Figure 1, for the sake of simplicity, Figure 1 only shows the specific structure of one of the casing steel bars 24.

More specifically, please refer to FIG. 2 , the load-bearing beam 14 and the distribution beam 15 are cross-arranged under the bottom plate 111. The load-bearing beam 14 and the distribution beam 15 are vertically intersected and connected, and the load-bearing beam 14 and the distribution beam 15 are distributed on both sides of the distribution area of the casing steel bars 24, and the distribution area of the casing steel bars 24 is the area of the casing 2. At least two load-bearing beams 14 are sandwiched on both sides of the casing 2, and the distribution beam 15 is distributed outside the distribution area of the casing steel bars 24. Some distribution beams 15 are arranged in sections, the purpose of which is to avoid the distribution area of the casing steel bars 24. The distribution beam 15 ends outside the distribution area of the casing steel bars 24, the purpose of which is to avoid the conflict between the distribution beam 15 and the casing 2, especially with the casing steel bars 24. In this embodiment, the distribution beam 15 is connected to the bottom plate 111, and the load-bearing beam 14 is further connected under the distribution beam 15. The reasonable arrangement of the load-bearing beam 14 and the distribution beam 15 can effectively distribute the load. In this embodiment, the load-bearing beam 14, the distribution beam 15, and the bottom plate 111 are connected by welding. In other possible implementations, they may be fixedly connected by bolt connection or the like.

Specifically, please refer to FIG. 3 , the bottom plate 111 of the casing 11 includes a plurality of bottom plate units. At the same time, the bottom plate 111 also includes a plurality of casing steel bar holes 111-C, and the casing steel bar holes 111-C are for the casing steel bar 24 to pass through and penetrate into the casing 11. The casing steel bar holes 111-C are formed by splicing two bottom plate units.

More specifically, the bottom plate unit includes at least two types - a main bottom plate 111-A and a side bottom plate 111-B. In this embodiment, the side bottom plates 111-B are assembled on both sides of the main bottom plate 111-A. In this embodiment only, two side bottom plates 111-B are respectively assembled on both sides of the main bottom plate 111-A to further form a bottom plate unit, and multiple bottom plate units can be further assembled into a bottom plate 111. In other possible implementations, the way the bottom plate unit is assembled by the main bottom plate 111-A and the side bottom plates 111-B is not limited to the one exemplarily shown in this embodiment. Without departing from the scope of the present invention, technicians can further adjust the assembly method according to factors such as the area of the bottom plate 111, the specific size, the number and position of the casing steel bar holes 111-C, etc.

Specifically in this embodiment, the specific structure of the bottom plate unit and an example of the assembly method are introduced by taking the main bottom plate 111-A as an example. Please refer to Figure 4, which shows the side structure of the main bottom plate 111-A. The main bottom plate 111-A is provided with a rib 111-A1 perpendicular to the main bottom plate surface 111-A4 and the connecting plate 111-A3. The connecting plate 111-A3 is provided with a connecting structure 111-A2. The rib 111-A1 can strengthen the overall stability of the main bottom plate 111-A and improve the bending moment resistance, which is of great significance for improving the load-bearing capacity. It is worth noting that only the main bottom plate 111-A is used as an example here, and the side bottom plate 111-B and the bottom plate 111 formed by the final assembly are also provided with a stiffening structure similar to the rib 111-A1.

Please further refer to FIG. 5, which exemplarily shows the connection between the main bottom plate 111-A and a side bottom plate 111-B (i.e., the area indicated by the circular dotted line A in FIG. 3), and the main bottom plate 111-A and the side bottom plate 111-B are fixedly connected by the connecting structure 111-A2. The assembly form and method of the bottom plate 111 of this embodiment and the present invention are illustrated by the fixed connection method shown by the main bottom plate 111-A and the side bottom plate 111-B. When assembling the main bottom plate 111-A and the side bottom plate 111-B, first hoist the connecting plate 111-A3 of the main bottom plate 111-A to the position close to the connecting plate structure of the side bottom plate 111-B. Further adjust the vertical position so that the surface of the main bottom plate 111-A is flush with the surface of the side bottom plate 111-B. Then further align the bolt holes on the connecting structure 111-A2 of the main bottom plate 111-A, screw on and tighten the bolts. The main bottom plate 111 -A and the side bottom plate 111 -B are fixedly connected by bolts, so that the assembled bottom plate 111 has good flatness and stability, and is convenient for subsequent disassembly operations.

Please refer to Figure 6 for further details. The casing 11 also includes a side form 112, which is circumferentially enclosed to form an enclosed space of the casing 11, and the above-mentioned cap steel skeleton 13 and other structures are arranged close to the side form 112. In this embodiment, a cushion block (not shown in the figure) is also provided between the cap steel skeleton 13 and the side form 112. The cushion block serves as a protective layer for the cap steel bars, and as a buffer and support component, it can act as a buffer between the cap steel skeleton 13 and the side form 112 during the lowering of the underwater cap construction structure 1, thereby extending the service life of the cap steel skeleton 13 and the side form 112 and improving the stability of the cap steel skeleton 13.

Specifically, at least one layer of inner support 114 perpendicular to the side mold 112 is provided inside the side mold 112. In the present embodiment, two layers of inner support 114 are provided. FIG. 6 is a top view of the casing 11 taken at one layer of the inner support 114. In the present embodiment, the inner support 114 is embodied as a cross structure formed by welding a plurality of hollow steel pipes. A stiffening plate 114-1 is also provided on the cross-shaped inner support 114, and the stiffening plate 114-1 is perpendicular to the inner support 114 and parallel to the bottom plate 111. Specifically, the connection between the inner support 114 and the side mold 112 is a flange connection.

More specifically, in conjunction with FIG. 1 , the inner support 114 is also provided with a positioning bracket (not shown) for positioning the internal steel bar structure such as the pier body steel bar 19 and the cap steel bar skeleton 13. In this embodiment, the positioning bracket is preferably a tic-tac-toe-shaped positioning bracket, which has the function of positioning and stabilizing when installing, hoisting, lowering, and trimming the steel bar structure.

More specifically, the casing 11 also includes a fence 113 that is sleeved on the outside of the side form 112, and the inner support 114 is arranged on the same horizontal plane corresponding to the fence 113. The fence 113 is used to surround the side form 112 and cooperate with the inner support 114 to enhance the stability of the side form 112. Further referring to FIG1 , in this embodiment, the fence 113 can also be set at a corresponding position of the base reinforcement skeleton 13, specifically, in the area between the top boundary and the bottom boundary of the base reinforcement skeleton 13. In this embodiment, the fence 113 is a section of metal frame strip with a certain width, and the width of the fence 113 can be adjusted according to engineering needs.

To be more specific, please refer to Figure 7 in conjunction with Figure 1. In addition to the horse stool reinforcement 121, the cushion layer 12 in the underwater pedestal construction structure 1 is poured with a cushioning concrete 16 that covers the area of the horse stool reinforcement 121. After the underwater pedestal construction structure 1 is lowered to the casing 2, concrete is poured in the area where the horse stool reinforcement 121 is arranged through the connecting pipe 18, and after solidification, it becomes the cushioning concrete 16. The connecting pipe 18 can also be used to pour the pedestal concrete 17 arranged in the corresponding area of the pedestal reinforcement skeleton 13 in Figure 1. Specifically, after the cushioning concrete 16 is solidified, the concrete is poured into the area where the pedestal reinforcement skeleton 13 is arranged through the connecting pipe 18, and after solidification, it becomes the pedestal concrete 17. The position of the connecting pipe 18 is preferably set near the top boundary of the cushion layer 12. In this embodiment, the cushioning concrete 16 and the pedestal concrete 17 can be poured and solidified together to shorten the concrete pouring and solidification time. The raised concrete 16 can resist tidal erosion and, together with the cap concrete 17 , lift the weight of the underwater cap construction structure 1 , overcome the buoyancy of the tide, and maintain the stability of the underwater cap construction structure 1 .

In order to better demonstrate the underwater pedestal construction structure 1 of this embodiment, the present invention is also adapted to provide a casing 2 that can cooperate with the underwater pedestal construction structure 1. Figures 8, 9, and 10 further explain the specific structure and improvement of the casing 2. First, refer to Figure 8, which is a schematic diagram of the connection between the bottom plate 111 and the casing 2 in this embodiment. The casing steel bar holes 111-C on the bottom plate 111 are aligned with the corresponding areas of the casing 2. A beam support 22 is also welded to the outer circumferential area of the outer wall 21 of the casing 2. The beam support 22 supports the entire underwater pedestal construction structure 1. Specifically, the beam support 22 of the casing 2 supports the bottom plate 111 and the load-bearing beam 14 and the distribution beam 15 connected to the bottom plate 111.

More specifically, please refer to Figure 9, which shows the connection between the casing 2 and the beam bracket 22, and the beam bracket 22 is also welded with a support steel bar 23. Please refer to Figure 10, which is a cross-sectional view of the beam bracket 22 in Figure 9, and it can be seen that the support steel bar 23 is welded to the upper part of the beam bracket 22, and the support steel bar 23 does not contact the outer wall 21 of the casing, but covers the area of the beam bracket 22 as much as possible, playing a better supporting role.

The underwater pedestal construction structure 1 in this embodiment adopts a cushioning layer 12, which can effectively resist the impact of the tide from the bottom of the casing 11, and protect the structure inside the casing 11 to a certain extent. The cushioning layer 12 has the function of supporting and waterproofing. The cushioning layer 12 has a certain height, which raises the pedestal steel frame 13 to prevent the tide from penetrating into the casing 11 and corroding the pedestal steel frame 13. The underwater pedestal construction structure 1 also connects the straight steel bars 241 and the trumpet steel bars 243 through the connection methods such as the straight threaded sleeve 242, and connects them to the casing steel bars 24. By modifying the structure of the casing steel bars 24, the conflict problem between the casing steel bars 24 and the underwater pedestal construction structure 1 during the lowering process can be solved. Furthermore, the underwater pedestal construction structure 1 of the present invention and this embodiment also meets the needs of a variety of different styles and sizes of the bottom plate 111 by assembling the bottom plate 111 of the casing 11. Specifically, the bottom plate 111 is bolted in the present invention and in this embodiment, and is assembled from a plurality of main bottom plates 111-A and side bottom plates 111-B, which has good adaptability. At the same time, the main bottom plates 111-A and the side bottom plates 111-B can also be assembled to form a casing steel bar hole 111-C, which can be aligned with the casing 2 and allow the casing steel bar 24 to pass through. The design of assembling the casing steel bar hole 111-C avoids the steps of welding a whole steel plate or multiple steel plates and then cutting holes in the prior art, avoids material waste, and can be recycled. The main bottom plates 111-A and the side bottom plates 111-B of the bottom plate 111 are also provided with a stiffening structure (such as a rib plate 111-A1), which can enhance the bending resistance of the bottom plate 111, and the load capacity of the bottom plate 111 is also greatly enhanced.

The present invention and the embodiment also strengthen the stability of the underwater pedestal construction structure 1 by setting an internal support 114. The internal support 114 is also provided with a positioning bracket, which can position the internal steel bar structure such as the pier body steel bar 19 and the pedestal steel bar skeleton 13, improve the position accuracy and stability of the steel bar, and even when it is lowered and after it is lowered, the steel bar structure will not change and affect the project. The casing 11 is also provided with a enclosure 113. The enclosure 113 is used alone or in conjunction with the internal support 114 to enhance the stability of the underwater pedestal construction structure 1 and enhance the structural strength. The embodiment and the present invention are also adapted to the underwater pedestal construction structure 1. The casing 2 is matched with the load-bearing beam 14 and the distribution beam 15 connected to the bottom plate 111 through the casing beam support 22 and the supporting steel bar 23 to enhance the bearing capacity of the casing 2. In summary, the underwater pedestal construction structure 1 can be waterproof and anti-seepage to a certain extent while saving the bottom sealing concrete, has good strength and bearing capacity, can adapt to underwater construction, and save materials, avoid material waste, and save resources. The underwater foundation construction structure 1 can be lowered as a whole when the overall assembly is completed, saving the time for on-site assembly and promoting the progress of the project to a certain extent.

The above descriptions are only some embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims (7)

1. The utility model provides an underwater cushion cap construction structure of whole lowering, is used for wholly assembling the whole back of completion and wholly lowering in order to form underwater cushion cap, its characterized in that, construction structure includes the cover box and the cushion cap reinforcement cage in the cover box, the cover box has the bottom plate, be equipped with between cushion cap reinforcement cage and the bottom plate and be in the cushion cap elevation below the bed hedgehopping layer; the height of the heightening layer is 20 cm-50 cm, the heightening layer comprises a plurality of split heads, the vertical direction of the split heads is fully distributed with the area where the heightening layer is located, and the plane direction of the split heads is fully distributed with the area where the upper end face of the bottom plate is located; the base plate comprises a plurality of base plate block units, and the pile casing reinforcing steel bar holes in the base plate are formed by splicing at least two base plate block units; the box sleeve further comprises a side die, wherein at least one layer of inner support perpendicular to the side die is arranged inside the side die; the box sleeve further comprises a enclosing wall sleeved outside the side die, and the inner support and the corresponding enclosing wall are arranged on the same horizontal plane;

And after the assembly of the integrally-lowered underwater bearing platform mounting structure is completed, the integrally-lowered underwater bearing platform mounting structure is integrally lowered to be matched with the pile casing.

2. The structure of claim 1, wherein the top end boundary of the pile cap reinforcement cage is higher than the top end boundary of a preset pile casing reinforcement, and the pile casing reinforcement comprises at least a straight bar and a horn bar.

3. The integrally lowered underwater bearing platform construction structure as claimed in claim 2, wherein the straight steel bars and the horn steel bars are connected in at least one of welding, sleeve and binding modes; and/or the joint of the straight steel bar and the horn steel bar is lower than the top boundary of the bearing platform steel bar framework.

4. The structure of claim 2, wherein the bottom plate further comprises cross-laid spandrel girders and distribution girders, the spandrel girders and the distribution girders are arranged on two sides of the pile casing reinforcement distribution area, and part of the distribution girders are arranged in sections to avoid the pile casing reinforcement distribution area.

5. The integrally lowered underwater platform construction structure of claim 1, wherein the floor block unit comprises a main floor block and side floor blocks spliced on both sides of the main floor block.

6. The integrally lowered underwater pile cap construction structure of claim 1 wherein said inner support is flanged to said side forms; and/or a stiffening plate is arranged on the inner support.

7. The integrally lowered underwater pile cap construction structure of claim 6, wherein a positioning bracket for positioning pier body steel bars is further arranged on the inner support.