Integral square steel cofferdam for torrential water area and construction method thereof

Abstract

The invention discloses an integral square steel cofferdam for a torrential water area and a construction method of the integral square steel cofferdam. The square steel cofferdam comprises a steel jacket box, a steel casing, a mounting guide structure, an inner support, a gravel layer and bottom sealing concrete, the steel jacket box comprises four side plates, and each of the four side plates comprises an upper-layer side plate and a lower-layer side plate; the upper-layer side plate and the lower-layer side plate are connected together through the stiffening ribs; hanging legs are fixedly mounted on the two oppositely arranged side plates; a steel casing is inserted into the steel jacket box; the installation guiding structure comprises a connecting frame, a sliding die, a fixing ring and a limiting block. The connecting frame is fixedly installed on the steel casing, and the steel casing located at the four corners in the steel jacket box is provided with a sliding formwork. The slip form is mounted on the steel casing through the fixing ring; the slip form is connected with the steel jacket box through a limiting block; an inner support is arranged in the steel jacket box; a gravel layer and bottom sealing concrete are respectively arranged at the bottom in the steel jacket box from bottom to top; a retention wall is arranged at the upstream of the square steel cofferdam; a water blocking steel pipe pile is arranged on the upstream of the water retaining wall.

Description

Technical Field

[0001] The invention relates to the technical field of water conservancy projects, and in particular to an integral square steel cofferdam in turbulent waters and a construction method thereof. Background Art

[0002] With the improvement of my country's bridge construction level and construction technology, there are more and more large-span bridges such as those across rivers and seas. As a result, the size of bridge foundations is also getting larger and larger. It is inevitable that bridge construction needs to face harsh construction environments such as rapid water flow and deep water. In order to ensure construction safety and quality, this puts higher requirements on the support conditions during the installation of our bridge foundations.

[0003] Steel cofferdam is a temporary support structure established in bridge engineering or water conservancy and hydropower engineering to promote the normal construction of permanent structures such as bridge pile foundations and dams. Its main function is to prevent water and soil from entering the construction site, keep the interior dry, and smoothly complete foundation pit excavation and structural construction. In a construction environment with turbulent water flow, the construction of steel cofferdam will mainly face the following two problems: 1. The water flow is turbulent, and the steel cofferdam is subject to a large impact force during installation, resulting in an offset in the installation; 2. The water pressure and water pressure variation range outside the cofferdam in the turbulent water flow section are greater, causing the cofferdam to collapse inward after installation.

[0004] Therefore, in order to solve the construction problem of steel cofferdams under turbulent water flow conditions, there is an urgent need for a steel cofferdam and its construction technology that is safe and efficient and can effectively withstand the impact of turbulent water flow. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] The technical problem to be solved by the present invention is to provide an integral square steel cofferdam for turbulent waters and a construction method thereof, which is safe and efficient in construction and can effectively withstand the impact of turbulent water flow.

[0007] (II) Technical solution

[0008] The solution adopted by the present invention to solve the above technical problems is an integral square steel cofferdam in turbulent waters, wherein the square steel cofferdam comprises a steel casing, a steel casing, an installation guide structure, an inner support, a crushed stone layer, and a bottom sealing concrete;

[0009] The steel casing comprises four side panels, which are enclosed to form the steel casing; the four side panels each comprise an upper side panel and a lower side panel; the upper side panel and the lower side panel are connected together by stiffening ribs; and a hanging leg is fixedly installed at one end of two oppositely arranged side panels close to each other;

[0010] A steel casing is inserted inside the steel casing;

[0011] The installation guide structure includes a bracket, a sliding mold, a fixing ring and a limit block; the bracket is fixedly installed on the steel casing, and the steel casings at the four corners in the steel casing are all provided with the sliding mold; the sliding mold is installed on the steel casing through the fixing ring; the sliding mold and the steel casing are connected through the limit block;

[0012] The inner support is arranged in the steel casing; the inner support includes an inner support rod and a hydraulic block; both ends of the inner support rod are connected to two opposite side plates of the steel casing in the length direction; and both ends of the inner support rod are installed with hydraulic blocks;

[0013] The bottom of the steel casing is respectively provided with the crushed stone layer and the bottom sealing concrete from bottom to top;

[0014] A retaining wall is provided upstream of the square steel cofferdam;

[0015] Water-blocking steel pipe piles are arranged upstream of the water retaining wall.

[0016] Specifically, the sliding mold has a track in the vertical direction, and the limit block is adapted in the track of the sliding mold, which can limit the displacement of the limit block in the lateral direction, so that during the lowering process of the steel casing, the limit block can only move along the vertical direction of the track, thereby improving the sinking accuracy and sinking efficiency of the steel casing.

[0017] Specifically, the upper side panels and the lower side panels are both spliced ​​together by a plurality of vertical connecting panels.

[0018] Specifically, the water retaining wall and the water-blocking steel pipe piles are combined to form a water-blocking structure of an integral square steel cofferdam in turbulent waters during construction, which is more efficient in construction and convenient for later disassembly.

[0019] In some embodiments, one end of the limit block is fixedly connected to the steel casing, and the other end is movably connected to the sliding mold, and the limit block can move up and down along the axial direction of the sliding mold.

[0020] In some embodiments, the hydraulic blocks at both ends of the inner support rod can collect displacement information of the side panel, and detect the displacement of the side panel in its thickness direction through an intelligent system; and, when it is detected that the side panel is displaced inward in its thickness direction, the hydraulic blocks can apply pressure and give force to the side panel to displace outward in its thickness direction.

[0021] In some embodiments, the inner support is arranged on a horizontal plane of the normal water level in the construction site; the inner support rod is vertically arranged on two opposite side plates along the length direction of the steel casing; the bracket is vertically arranged on the steel casing along the length direction of the steel casing.

[0022] In some embodiments, the water-blocking steel pipe piles include a plurality of steel pipe piles, and the plurality of steel pipe piles are connected in sequence to form an arch structure, and there is no gap between adjacent steel pipe piles, and an arch connection structure is arranged on the top of the plurality of steel pipe piles; the water-blocking steel pipe piles are provided with a plurality of steel pipe piles inserted at both ends of the arch to form a square structure.

[0023] The solution adopted by the present invention to solve the above technical problems is the construction method of the integral square steel cofferdam in turbulent waters as mentioned above, comprising the following steps:

[0024] Step (1): driving water-blocking steel pipe piles upstream of the construction area of ​​the square steel cofferdam, determining the buried depth of the steel pipe piles according to the water depth and flow velocity, and controlling the verticality and distance using a guide frame;

[0025] Step (2): vertically lowering a water retaining wall between the construction area of ​​the square steel cofferdam and the water-blocking steel pipe piles;

[0026] Step (3): inserting a steel casing in the construction area of ​​the square steel cofferdam, and installing a sliding form and a fixing ring on the steel casing at the four corners;

[0027] Step (4): leveling and cutting the steel casing at the designed elevation, installing the bracket, and setting through-hole jacks and suspension rods at the two ends of the bracket;

[0028] Step (5): Assemble the lower side panels on the assembly platform, first assemble the right-angle blocks and then the side blocks until they are formed, and install the hanging legs at the corresponding positions on the long sides to complete the assembly of the lower structure of the steel casing. Lift the steel casing by the jack and the suspension rod, arrange the limit blocks to connect the steel casing with the sliding formwork, and lower the steel casing to the designed elevation by the jack and the suspension rod;

[0029] Step (6): Splice the upper side panels on the assembly platform, first splice the right-angle blocks and then the side blocks, until they are formed, and install the hanging legs at the corresponding positions on the long sides to complete the splicing of the upper structure of the steel casing, lift the steel casing by the jack and the suspension rod, arrange the limit blocks to connect the steel casing with the sliding form, lower it by the jack and the suspension rod, connect it with the lower structure of the steel casing, and install the stiffening ribs to splice the upper structure of the steel casing and the lower structure of the steel casing together;

[0030] Step (7): At the bottom of the steel casing, crushed stone and gap-filling blocks are used to level the riverbed bottom to complete the arrangement of the crushed stone layer;

[0031] Step (8): Carry out concrete bottom sealing construction, pour concrete into the bottom of the square steel cofferdam through the conduit, control the bottom sealing depth with the intelligent control measuring rope, and complete the arrangement of the bottom sealing concrete;

[0032] Step (9): After the concrete strength of the bottom seal concrete reaches 90% or not less than 7 days after the pouring is completed, the cofferdam pumping construction is carried out, and the internal support is installed during the pumping process;

[0033] Step (10): After the concrete curing of the bottom concrete is completed, the top bracket is removed, the installation guide system is removed, and the steel casing is cut at a position 15 cm higher than the top surface of the bottom concrete. After that, further engineering construction can be carried out in the square steel cofferdam.

[0034] In some embodiments, in step (5) and step (6), during the lowering process of the steel casing, the jacks are controlled by an intelligent system. The intelligent system can receive the displacement signal of the steel casing and detect the lowering posture of the steel casing. If the steel casing has an offset that exceeds the allowable limit of the project during the lowering process, the system will adjust each jack to correct the posture of the steel casing during the lowering process to achieve automated installation of the steel casing.

[0035] Specifically, the upper side panels and the lower side panels are both formed by splicing a plurality of vertical connecting panels; and in the steps (5) and (6), splicing the right-angle blocks first and then the side blocks means splicing the connecting panels at the four corners first and then the connecting panels in the middle, thereby completing the forming of the upper side panels and the lower side panels.

[0036] In some embodiments, in step (8), when the concrete is used for bottom sealing construction, a pouring sequence needs to be specified to ensure that the concrete continuously and effectively covers the entire bottom sealing range.

[0037] In some embodiments, in step (9), when pumping construction is carried out, it is necessary to observe and record the changes in the water level in the cofferdam, and make various warnings and responses according to the changes in the water level; if leakage is found on the outer wall of the cofferdam, the leaking area should be sealed in time.

[0038] (III) Beneficial effects

[0039] Compared with the prior art, the present invention designs an integral square steel cofferdam for turbulent waters and a construction method thereof.

[0040] (1) The present invention adopts a combination of arched water-blocking steel pipe piles and a water retaining wall to achieve the effect of interception and diversion, which effectively reduces the impact force of the water flow, creates a relatively stable installation environment for the construction of the square steel cofferdam, and reduces the construction difficulty of the square steel cofferdam; and the water-blocking steel pipe piles are arranged in an arch shape. Compared with the straight-line arrangement of steel pipe piles, the arch arrangement has a higher impact resistance. The top is provided with an arched connection structure, and steel pipe piles are inserted at both ends, forming a square shape, which can further improve the overall strength of the water-blocking steel pipe piles;

[0041] (2) The installation guide system of the present invention adopts a structural form of a combination of a sliding form and a limit block to limit the lowering of the steel casing and fix its moving route. The lowering of the steel casing will be carried out along the track of the sliding form, which improves the sinking accuracy and sinking efficiency of the steel casing;

[0042] (3) The present invention adopts an intelligent system to intelligently detect the displacement of the steel cofferdam, capture the possible deviation of the steel casing during the lowering process, and make real-time adjustments, which improves the sinking accuracy of the steel casing and its construction efficiency, while reducing the demand for construction technicians, reducing project costs, and improving the degree of construction automation;

[0043] (4) The internal support of the present invention uses a hydraulic block structure, which can collect displacement information from the side plates and determine the displacement of the side plates through an intelligent system. When the side plates are excessively displaced inward, pressure is applied to increase the support reaction force to prevent the side plates from collapsing inward. This improves the overall strength of the steel cofferdam and can adapt to situations where external loads vary greatly in turbulent river sections. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1 It is the layout diagram of the integral square steel cofferdam in turbulent waters;

[0046] Figure 2 This is a schematic diagram of the structure of an integral square steel cofferdam in turbulent waters;

[0047] Figure 3 This is a cross-sectional view of an integral square steel cofferdam in turbulent waters;

[0048] Figure 4 This is a schematic diagram of the structure after the installation device of the integral square steel cofferdam in turbulent waters is dismantled;

[0049] Figure 5(a) is a schematic diagram of inserting steel casing during the construction of a square steel cofferdam;

[0050] FIG5( b ) is a schematic diagram of the lower structure of the steel casing during the construction of the square steel cofferdam;

[0051] FIG5( c ) is a schematic diagram of the upper structure of the steel casing being lowered during the construction of the square steel cofferdam;

[0052] FIG5( d ) is a schematic diagram of pouring the bottom gravel layer and bottom sealing concrete during the construction of a square steel cofferdam;

[0053] Figure 5(e) is a schematic diagram of the installation of internal supports during the construction of a square steel cofferdam;

[0054] Figure 5(f) is a schematic diagram of pumping out water from a steel casing during the construction of a square steel cofferdam;

[0055] Figure 5(g) is a schematic diagram of the completed cofferdam installation during the square steel cofferdam construction;

[0056] Figure 5(h) is a schematic diagram of the structure after the cofferdam installation device is removed during the construction of the square steel cofferdam.

[0057] The names of the components corresponding to the various figure marks in the figure are: 1. Steel casing; 1-1. Upper side plate; 1-2. Lower side plate; 1-3. Hanging leg; 1-4. Stiffening rib; 2. Steel casing; 3. Installation guide system; 3-1. Frame; 3-2. Slipform; 3-3. Fixed ring; 3-4. Limit block; 4. Inner support; 4-1. Inner support rod; 4-2. Hydraulic block; 5. Gravel layer; 6. Bottom concrete; 7. Retaining wall; 8. Water-blocking steel pipe pile. DETAILED DESCRIPTION

[0058] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0059] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0061] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspect described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0062] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0063] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the examples can be practiced without these specific details.

[0064] The technical solutions provided by various embodiments of the present application are described below in conjunction with the accompanying drawings.

[0065] like Figure 1-Figure 4As shown, the present invention provides an integral square steel cofferdam for turbulent waters, the square steel cofferdam comprises a steel casing 1, a steel casing 2, an installation guide structure, an inner support 4, a crushed stone layer 5, and a bottom concrete 6; the steel casing 1 comprises four side panels, and the four side panels enclose the steel casing 1; the four side panels each comprise an upper side panel 1-1 and a lower side panel 1-2; the upper side panel 1-1 and the lower side panel 1-2 are connected together by stiffening ribs 1-4; and, a hanging leg 1-3 is fixedly installed at one end of two oppositely arranged side panels in the length direction of the steel casing 1 close to each other; a steel casing 2 is inserted into the interior of the steel casing 1; the installation guide structure comprises a bracket 3-1, a sliding form 3-2, a fixing ring 3-3 and a limit block 3-4; the bracket 3-1 is fixedly installed on the steel casing The steel casing 2 is on the tube 2, and the steel casing 2 located at the four corners in the steel casing 1 is provided with the slipform 3-2; the slipform 3-2 is installed on the steel casing 2 through a fixing ring 3-3; the slipform 3-2 is connected to the steel casing 1 through the limit block 3-4; the inner support 4 is arranged in the steel casing 1; the inner support 4 includes an inner support rod 4-1 and a hydraulic block 4-2; the two ends of the inner support rod 4-1 are connected to the two opposite side plates of the steel casing 1 in the length direction; and the two ends of the inner support rod 4-1 are installed with hydraulic blocks 4-2; the bottom of the steel casing 1 is respectively arranged with the crushed stone layer 5 and the bottom sealing concrete 6 from bottom to top; a water retaining wall 7 is arranged upstream of the square steel cofferdam; a water-blocking steel pipe pile 8 is arranged upstream of the water retaining wall 7. Specifically, the slide form 3-2 has a track in the vertical direction, and the limit block 3-4 is adapted in the track of the slide form 3-2, which can limit the displacement of the limit block 3-4 in the lateral direction, so that during the lowering process of the steel casing 1, the limit block 3-4 can only move along the vertical direction of the track, thereby improving the sinking accuracy and sinking efficiency of the steel casing 1. Specifically, the upper side plate 1-1 and the lower side plate 1-2 are spliced ​​together by a plurality of vertical connecting plates.

[0066] In some embodiments, one end of the limit block 3-4 is fixedly connected to the steel casing 1, and the other end is movably connected to the sliding mold 3-2, and the limit block 3-4 can move up and down along the axial direction of the sliding mold 3-2.

[0067] In some embodiments, the hydraulic blocks 4-2 at both ends of the inner support rod 4-1 can collect the displacement information of the side plate, and detect the displacement of the side plate in the thickness direction through the intelligent system; and, upon detecting that the side plate is displaced inward in the thickness direction, the hydraulic block 4-2 can pressurize and apply force to the side plate to displace outward in the thickness direction. In some embodiments, the inner support 4 is arranged on a horizontal plane of the normal water level in the construction site; the inner support rod 4-1 is arranged vertically on two opposite side plates along the length direction of the steel casing 1; the bracket 3-1 is arranged vertically on the steel casing 2 along the length direction of the steel casing 1.

[0068] In some embodiments, the water-blocking steel pipe piles 8 include a plurality of steel pipe piles, and the plurality of steel pipe piles are connected in sequence to form an arch structure, and there is no gap between adjacent steel pipe piles, and an arch connection structure is arranged on the top of the plurality of steel pipe piles; the water-blocking steel pipe piles 8 are located at both ends of the arch and a plurality of steel pipe piles are inserted and driven to form a square structure.

[0069] like Figure 5(a)-Figure 5(h) The present invention also provides a construction method for an integral square steel cofferdam in turbulent waters, comprising the following steps:

[0070] Step (1): Driving water-blocking steel pipe piles 8 upstream of the construction area of ​​the square steel cofferdam, determining the buried depth of the steel pipe piles according to the water depth and flow velocity, and controlling the verticality and distance using a guide frame;

[0071] Step (2): vertically lower the water retaining wall 7 in the middle area between the construction area of ​​the square steel cofferdam and the water-blocking steel pipe pile 8;

[0072] Step (3): inserting a steel casing 2 in the construction area of ​​the square steel cofferdam, and installing a sliding form 3-2 and a fixing ring 3-3 on the steel casing 2 at the four corners;

[0073] Step (4): leveling and cutting the steel casing 2 at the designed elevation, then installing the bracket 3-1, and setting through-hole jacks and suspension rods at the two ends of the bracket 3-1;

[0074] Step (5): Splice the lower side panels 1-2 on the assembly platform, first splice the right-angle blocks and then the side blocks, until they are formed, and install the hanging legs 1-3 at the corresponding positions on the long sides to complete the splicing of the lower structure of the steel casing 1, lift the steel casing 1 by the jack and the suspension rod, arrange the limit blocks 3-4 to connect the steel casing 1 with the sliding form 3-2, and use the jack and the suspension rod to lower the steel casing 1 to the designed elevation; and during the lowering process of the steel casing 1, the jack is controlled by the intelligent system, and the intelligent system can receive the displacement signal of the steel casing 1 and detect the lowering posture of the steel casing 1. If the steel casing 1 deviates beyond the allowable deviation of the project during the lowering process, the system will adjust each jack to correct the posture of the steel casing 1 during the lowering process to achieve the automatic installation of the steel casing 1;

[0075] Step (6): Splice the upper side panels 1-1 on the assembly platform, first splice the right-angle blocks and then the side blocks until they are formed, and install the hanging legs 1-3 at the corresponding positions on the long sides to complete the splicing of the upper structure of the steel casing 1, lift the steel casing 1 by the jack and the suspension rod, arrange the limit blocks 3-4 to connect the steel casing 1 with the sliding form 3-2, lower it by the jack and the suspension rod, connect it with the lower structure of the steel casing 1, and install the stiffening ribs 1-4 to splice the upper structure of the steel casing 1 and the lower structure of the steel casing 1 together; and, during the lowering process of the steel casing 1, the jack is controlled by the intelligent system, and the intelligent system can receive the displacement signal of the steel casing 1 and detect the lowering posture of the steel casing 1. If the steel casing 1 deviates beyond the allowable deviation of the project during the lowering process, the system will adjust each jack to correct the posture of the steel casing 1 during the lowering process to achieve the automatic installation of the steel casing 1;

[0076] Step (7): At the bottom of the steel casing 1, crushed stones and gap-filling stones are used to level the bottom of the riverbed to complete the arrangement of the crushed stone layer 5;

[0077] Step (8): Perform concrete bottom sealing construction, pour concrete into the bottom of the square steel cofferdam through the conduit, control the bottom sealing depth through the intelligent control measuring rope, and complete the arrangement of the bottom sealing concrete 6; and when the concrete bottom sealing construction is performed, it is necessary to specify the pouring sequence to ensure that the concrete continuously and effectively covers the entire bottom sealing range;

[0078] Step (9): After the concrete strength of the bottom concrete 6 reaches 90% or not less than 7 days after the pouring is completed, the cofferdam is pumped out, and the inner support 4 is installed during the pumping process; and during the pumping construction, the water level changes in the cofferdam need to be observed and recorded, and various warnings and responses are made according to the water level changes; if the outer wall of the cofferdam is found to be leaking, the leaking area should be sealed in time;

[0079] Step (10): After the concrete curing of the bottom concrete 6 is completed, the top bracket 3-1 is removed, the installation guide system 3 is removed, and the steel casing 2 is cut at a position 15 cm higher than the top surface of the bottom concrete 6. After that, further engineering construction can be carried out in the square steel cofferdam.

[0080] Specifically, the upper side panel 1-1 and the lower side panel 1-2 are both formed by splicing a plurality of vertical connecting panels; and in the steps (5) and (6), splicing the right-angle blocks first and then the side blocks means splicing the connecting panels at the four corners first and then the connecting panels in the middle, thereby completing the forming of the upper side panel 1-1 and the lower side panel 1-2.

[0081] The same and similar parts between the various embodiments in this specification can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0082] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. Integral square steel cofferdam for turbulent waters, characterized by: The square steel cofferdam comprises a steel casing (1), a steel casing (2), an installation guide structure, an inner support (4), a crushed stone layer (5), and a bottom sealing concrete (6); The steel casing (1) comprises four side panels, which are enclosed to form the steel casing (1); the four side panels each comprise an upper side panel (1-1) and a lower side panel (1-2); the upper side panel (1-1) and the lower side panel (1-2) are connected together via stiffening ribs (1-4); and a hanging leg (1-3) is fixedly mounted on one end of two side panels arranged opposite to each other and close to each other; A steel casing (2) is inserted into the interior of the steel casing (1); The installation guide structure comprises a bracket (3-1), a sliding mold (3-2), a fixing ring (3-3) and a limit block (3-4); the bracket (3-1) is fixedly installed on the steel casing (2), and the steel casing (2) located at the four corners in the steel casing (1) is provided with the sliding mold (3-2); the sliding mold (3-2) is installed on the steel casing (2) via the fixing ring (3-3); the sliding mold (3-2) and the steel casing (1) are connected via the limit block (3-4); The inner support (4) is arranged in the steel casing (1); the inner support (4) comprises an inner support rod (4-1) and a hydraulic block (4-2); both ends of the inner support rod (4-1) are connected to two opposite side plates of the steel casing (1) in the length direction; and both ends of the inner support rod (4-1) are installed with hydraulic blocks (4-2); The bottom of the steel casing (1) is provided with the crushed stone layer (5) and the bottom sealing concrete (6) from bottom to top; A water retaining wall (7) is arranged upstream of the square steel cofferdam; Water-blocking steel pipe piles (8) are arranged upstream of the water retaining wall (7).

2. The integral square steel cofferdam for turbulent waters according to claim 1 is characterized by: One end of the limit block (3-4) is fixedly connected to the steel casing (1), and the other end is movably connected to the sliding mold (3-2), and the limit block (3-4) can move up and down along the axial direction of the sliding mold (3-2).

3. The integral square steel cofferdam for turbulent waters according to claim 1 is characterized by: The hydraulic blocks (4-2) at both ends of the inner support rod (4-1) can collect displacement information of the side plate and detect the displacement of the side plate in the thickness direction thereof through an intelligent system; and, upon detecting that the side plate is displaced inwardly in the thickness direction thereof, the hydraulic blocks (4-2) can apply pressure and give the side plate a force to displace outwardly in the thickness direction thereof.

4. The turbulent waters integral square steel cofferdam according to claim 1, characterized in that: The inner support (4) is arranged on a horizontal plane of a normal water level in a construction site; the inner support rod (4-1) is arranged vertically on two opposite side plates along the length direction of the steel casing (1); and the bracket (3-1) is arranged vertically on the steel casing (2) along the length direction of the steel casing (1).

5. The integral square steel cofferdam for turbulent waters according to claim 1 is characterized by: The water-blocking steel pipe pile (8) comprises a plurality of steel pipe piles, and the plurality of steel pipe piles are connected in sequence to form an arch structure, and there is no gap between adjacent steel pipe piles, and an arch connection structure is arranged on the top of the plurality of steel pipe piles; the water-blocking steel pipe pile (8) is provided with a plurality of steel pipe piles inserted at both ends of the arch to form a square structure.

6. The construction method of the integral square steel cofferdam in turbulent waters according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step (1): driving water-blocking steel pipe piles (8) upstream of the construction area of ​​the square steel cofferdam, determining the buried depth of the steel pipe piles according to the water depth and flow velocity, and controlling the verticality and distance using a guide frame; Step (2): vertically lowering a water retaining wall (7) in the middle area between the construction area of ​​the square steel cofferdam and the water-blocking steel pipe pile (8); Step (3): inserting a steel casing (2) in the construction area of ​​the square steel cofferdam, and installing a sliding form (3-2) and a fixing ring (3-3) on the steel casing (2) located at the four corners; Step (4): leveling and cutting the steel casing (2) at the designed elevation, then installing the bracket (3-1), and setting through-hole jacks and suspension rods at the two ends of the bracket (3-1); Step (5): assemble the lower side panels (1-2) on the assembly platform, first assemble the right-angle blocks and then the side blocks until they are formed, and install the hanging legs (1-3) at the corresponding positions on the long sides to complete the assembly of the lower structure of the steel casing (1), lift the steel casing (1) by means of a jack and a suspension rod, arrange the limit blocks (3-4) to connect the steel casing (1) with the sliding form (3-2), and lower the steel casing (1) to the designed elevation by means of the jack and the suspension rod; Step (6): assembling the upper side panels (1-1) on the assembly platform, first assembling the right-angle blocks and then the side blocks, until the shape is formed, and installing the hanging legs (1-3) at the corresponding positions on the long sides to complete the assembly of the upper structure of the steel casing (1), lifting the steel casing (1) by means of a jack and a suspension rod, arranging the limit blocks (3-4) to connect the steel casing (1) with the sliding form (3-2), lowering it by means of a jack and a suspension rod to connect it with the lower structure of the steel casing (1), and installing the stiffening ribs (1-4) to assemble the upper structure of the steel casing (1) and the lower structure of the steel casing (1) together; Step (7): At the bottom of the steel casing (1), crushed stones and gap-filling blocks are used to level the bottom of the riverbed to complete the arrangement of the crushed stone layer (5); Step (8): Carry out concrete bottom sealing construction, pour concrete into the bottom of the square steel cofferdam through the conduit, control the bottom sealing depth by intelligent control measuring rope, and complete the arrangement of bottom sealing concrete (6); Step (9): After the concrete strength of the bottom seal concrete (6) reaches 90% or not less than 7 days after the pouring is completed, the cofferdam pumping construction is carried out, and the internal support (4) is installed during the pumping process; Step (10): After the concrete curing of the bottom concrete (6) is completed, the top bracket (3-1) is removed, the installation guide system (3) is removed, and the steel casing (2) is cut at a position 15 cm higher than the top surface of the bottom concrete (6). After that, further engineering construction can be carried out in the square steel cofferdam.

7. The construction method of the integral square steel cofferdam in turbulent waters according to claim 6 is characterized by: In step (5) and step (6), during the lowering process of the steel casing (1), the jacks are controlled by an intelligent system, and the intelligent system can receive the displacement signal of the steel casing (1) and detect the lowering posture of the steel casing (1). If the steel casing (1) deviates beyond the allowable limit of the project during the lowering process, the system will adjust each jack to correct the posture of the steel casing (1) during the lowering process, so as to realize the automated installation of the steel casing (1).

8. The construction method of the integral square steel cofferdam in turbulent waters according to claim 6 is characterized by: In the step (8), when the concrete is used for bottom sealing construction, a pouring sequence needs to be specified to ensure that the concrete continuously and effectively covers the entire bottom sealing range.

9. The construction method of the integral square steel cofferdam in turbulent waters according to claim 6, characterized in that: In the step (9), when the pumping construction is carried out, the water level changes in the cofferdam need to be observed and recorded, and various warnings and responses are made according to the water level changes; if leakage is found on the outer wall of the cofferdam, the leaking area should be sealed in time.

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