Steel cofferdam structure for auxiliary construction of deepwater foundation

Abstract

The utility model relates to a steel cofferdam structure for deepwater foundation auxiliary construction. The method is suitable for the technical field of cofferdams. According to the technical scheme, the cofferdam comprises a plurality of corner connecting units and cofferdam wall bodies arranged between every two adjacent corner connecting units. The cofferdam wall body comprises at least one cofferdam unit, and the cofferdam unit is formed by splicing a plurality of hollow steel plates; a first limiting column is arranged on the right side face of the hollow steel plate, a first limiting clamping groove capable of being matched with the first limiting column is formed in the left side face of the hollow steel plate, and a sealing air bag matched with a gap between the first limiting clamping groove and the first limiting column is arranged in the first limiting clamping groove. The top of the hollow steel plate is provided with a top sealing structure, and the bottom of the hollow steel plate is provided with a bottom sealing structure matched with the top sealing structure to achieve sealing. At least one connecting seat is fixed on the inner side surface of the hollow steel plate; a supporting and fixing mechanism is arranged in the steel cofferdam structure and fixedly connected with the connecting bases of the hollow steel plates on the steel cofferdam structure.

Description

Technical Field

[0001] The utility model relates to a steel cofferdam structure for auxiliary construction of deep - water foundation, which is applicable to the technical field of cofferdams. Background Technique

[0002] The steel cofferdam structure is a commonly used temporary water - retaining structure in the construction of deep - water foundations, and its design and construction are crucial for ensuring the safety and smooth progress of construction. Steel cofferdams are generally divided into single - wall and double - wall forms. The single - wall steel cofferdam structure is relatively simple and mainly consists of side plates and bottom - sealed concrete. The side plates are generally made of steel plates welded together, and their thickness and strength are determined according to engineering needs. The bottom - sealed concrete is used to form a solid foundation at the bottom of the cofferdam to prevent water from seeping in from the bottom. The double - wall steel cofferdam structure is more complex and consists of inner and outer wall plates, horizontal ring plates, horizontal cross braces, vertical ribs of the wall plates, bulkheads, etc. Inner trusses are arranged between the inner and outer wall plates, which are divided into horizontal and vertical types and are the main load - bearing structures. The bulkheads, as vertical steel plates, mainly connect the inner and outer wall plates, dividing the cofferdam into several compartments to facilitate the adjustment of the position and inclination of the cofferdam and balance the internal and external water head differences.

[0003] During the production process of the steel cofferdam, the method of piece - by - piece production is generally adopted. First, a stable production platform is built, and then the lofting and installation of the inner and outer wall plates, vertical ribs, horizontal trusses, bulkheads, etc. are carried out according to the design requirements. After all components are welded, a kerosene penetration test is carried out to check the weld quality.

[0004] For the common use in deep - water foundation construction, due to the complex water conditions, in order to ensure the smooth progress of construction, the double - wall steel cofferdam structure is mostly adopted. The double - wall steel cofferdam structure is not only more complex in structure, but also time - consuming and laborious in installation and welding. In addition, after the construction of the bridge pier is completed, the steel cofferdam needs to be removed in a timely manner. Since the existing steel cofferdam is installed by welding, cutting is required during removal, which not only delays the construction time, but also the steel cofferdam modules after cutting and removal cannot be used again, and the recyclability is poor, further increasing the construction cost. Summary of the Invention

[0005] The technical problem to be solved by the utility model is: aiming at the above - mentioned problems, to provide a steel cofferdam structure for auxiliary construction of deep - water foundation.

[0006] The technical solution adopted by the utility model is: a steel cofferdam structure for auxiliary construction of deep - water foundation, characterized in that: it includes a plurality of corner connection units located at the corners of the steel cofferdam structure, and a cofferdam wall body arranged between two adjacent corner connection units;

[0007] The cofferdam wall body includes at least one cofferdam unit, and the cofferdam unit is spliced by a plurality of hollow steel plates;

[0008] On the right side of the hollow steel plate, there is a first limiting post, and on the left side of the hollow steel plate, there is a first limiting slot that can cooperate with the first limiting post. Inside the first limiting slot, there is a sealing airbag adapted to the gap between the first limiting slot and the first limiting post.

[0009] On the top of the hollow steel plate, there is a top sealing structure, and on the bottom of the hollow steel plate, there is a bottom sealing structure that can cooperate with the top sealing structure to achieve sealing.

[0010] At least one connecting seat is fixed on the inner side surface of the hollow steel plate; inside the steel cofferdam structure, there is a support and fixation mechanism, and this support and fixation mechanism is fixedly connected to the connecting seats of each hollow steel plate on the steel cofferdam structure.

[0011] On the hollow steel plate on both the inner and outer sides of the first limiting post, there are respectively a first guiding strip and a first guiding slot. On the hollow steel plate on both the inner and outer sides of the first limiting slot, there are respectively a first guiding slot and a first guiding strip, and the first guiding slot is adapted to the first guiding strip.

[0012] Inside the first guiding slot, several guiding wheels that can cooperate with the first guiding strip are installed.

[0013] At the lower end of the cofferdam unit, there is a counterweight and settlement unit, and a sealing ring is arranged between two adjacent counterweight and settlement units.

[0014] The counterweight and settlement unit includes a box body with a right trapezoidal cross-section. On the top of the box body, there is an installation slot that can cooperate with the hollow steel plate, and on one surface of the box body, there is a cement pouring pipe communicated with the inner cavity of the box body.

[0015] One end of the box body is provided with a groove, and the other end of the box body is fixed with a flange that can cooperate with the groove. The sealing ring is sleeved on the flange and its two ends respectively abut against the side surfaces of two adjacent box bodies.

[0016] A cleaning port communicated with the inner cavity of the box body is opened in the groove, and a sealing plate adapted to the inner cavity of the cleaning port is fixed at the bottom of the groove through bolts.

[0017] The corner connection unit includes a steel column. On the first side surface of the steel column, there is a second limiting post that can cooperate with the first limiting slot, and on both the inner and outer sides of the second limiting post, there are respectively a second guiding strip and a second guiding slot;

[0018] On the second side surface of the steel column, there is a second limiting slot that can cooperate with the first limiting post, and on both the inner and outer sides of the second limiting slot, there are respectively a second guiding slot and a second guiding strip;

[0019] The second guiding strip can cooperate with the first guiding slot, and the second guiding slot can cooperate with the first guiding strip.

[0020] The bottom end of the steel column is connected with a wedge-shaped solid steel corner, and the wedge-shaped solid steel corner is provided with connection slots and connection bumps that can cooperate with the weight settlement unit at the lower end of the cofferdam unit.

[0021] Both the top sealing structure and the bottom sealing structure have sealing grooves opened on the end faces of the hollow steel plates, and the sealing grooves are filled with sealing strips;

[0022] The sealing groove includes two straight sealing grooves and one arc-shaped sealing groove. The two straight sealing grooves are respectively located on the inner and outer sides of the end face, and the straight sealing grooves extend from the left end to the right end of the hollow steel plate; the arc-shaped sealing groove corresponds to the first limit card slot and connects the two straight sealing grooves.

[0023] The support and fixing mechanism includes a fixing structure and an internal support structure;

[0024] The fixing structure includes an adjusting rod. Cross-shaped connecting sleeves are fixed at both ends of the adjusting rod. Fixed seats are fixed on the cross-shaped connecting sleeves. External threaded columns that can penetrate the connecting seats on the hollow steel plates are fixed on the fixed seats, and locking nuts are threadedly connected to the top ends of the external threaded columns;

[0025] The internal support structure includes a support plate installed on the adjusting rod. A rotating seat rotatably connected to the adjusting rod is fixed on one surface of the support plate. A sliding groove is opened on the other surface of the support plate. A sliding block is slidably connected in the sliding groove. A locking bolt with one end abutted against the inner bottom of the sliding groove penetrates through the sliding block. One end of the sliding block located outside the sliding groove is hinged with an adjustable support rod.

[0026] The adjusting rod includes an adjusting sleeve. Connecting rods are threadedly connected to both ends of the sleeve. Connection blocks that cooperate with the cross-shaped connecting sleeves are fixed at the ends of the connecting rods away from the sleeve. A limit ring that cooperates with the rotating seat is fixed at the middle position of the outer cylindrical surface of the sleeve.

[0027] The adjustable support rod includes an internally threaded sleeve. External threaded rods are threadedly connected to both ends of the internally threaded sleeve. Hinge seats hinged with the sliding block are fixed at the ends of the external threaded rods away from the internally threaded sleeve.

[0028] An inlet communicating with its interior is opened at the top of the hollow steel plate, and a drain pipe communicating with its interior is connected to the bottom of the hollow steel plate. The drain pipe can be inserted and fitted with the inlet at the top of the lower hollow steel plate.

[0029] A construction method for a steel cofferdam structure for deep-water foundation auxiliary construction, characterized by comprising the following steps:

[0030] S1: Install a cofferdam assembly platform according to the size of the designed cofferdam. Use a crawler crane to lift the box body and the wedge-shaped solid steel corner to the cofferdam assembly platform and assemble them in pairs in sequence. Assemble multiple box bodies in sequence to form a counterweight settlement unit at the bottom. Multiple counterweight settlement units cooperate with the wedge-shaped solid steel corners at the corners to form the blade feet at the bottom of the cofferdam.

[0031] S2: Use a crawler crane to symmetrically install the hollow steel plates below in sequence into the installation slots. Install steel columns that cooperate with the hollow steel plates below at the corners. During the lowering process, make the first limit column extend into the first limit card slot on the adjacent hollow steel plate, and the first guiding strip extend into the first guiding groove on the adjacent hollow steel plate.

[0032] S3: After lowering one layer of hollow steel plates and steel columns, fixedly connect the hollow steel plates and steel columns to the box body and the wedge-shaped solid steel corner in S1 through bolts. Then fill the sealing airbag into the gap between the first limit column and the first limit card slot, and then inflate the sealing airbag to make it expand to complete the sealing of the gap between two adjacent hollow steel plates.

[0033] S4: Install the upper-layer hollow steel plates and steel columns to the designed height of the cofferdam in sequence according to the construction steps in S2. At the same time, connect and fix different layers of hollow steel plates through a fixing structure to form the cofferdam wall body.

[0034] S5: Install the corresponding internal support structure in the cofferdam wall body according to the height of the cofferdam. After completing the installation of the cofferdam;

[0035] S6: Lower the cofferdam according to the construction steps.

[0036] The beneficial effects of the present utility model are as follows: The present utility model changes the double-wall steel cofferdam used in cofferdam construction into hollow steel plates that can be spliced with each other. When manufacturing the steel cofferdam, only need to make the adjacent hollow steel plates spliced and connected through the cooperation of limit columns, card slots, etc., and use a support fixing mechanism to reinforce the connection between the hollow steel plates, so that the hollow steel plates can form a whole to compose the cofferdam wall body.

[0037] The present utility model fixes each hollow steel plate into a whole through the fixing structure arranged inside the cofferdam, and cooperates with the internal support structure to support the steel cofferdam from the inside. During use, the fixing structure can be adjusted according to the actual situation to ensure the tightness of the connection between adjacent hollow steel plates, and the adjustable internal support structure is set to adjust the support position according to the stress state of the cofferdam to ensure the firmness of the overall structure of the cofferdam and the anti-impact deformation ability.

[0038] The present utility model can achieve sealing by filling sealed airbags and sealing strips in the gaps between adjacent hollow steel plates, without the need for welding after splicing, saving construction time and reducing construction costs. At the same time, since the steel cofferdam is composed of multiple modules spliced together, it can be easily demolished, and the demolished steel cofferdam modules can be recycled again, further reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 FIG. is a schematic structural diagram of a steel cofferdam structure for assisting in the construction of deep-water foundations according to the present utility model.

[0040] Figure 2 FIG. is a schematic structural diagram of the cooperation of the cofferdam unit, the counterweight settlement unit, and the fixing structure according to the present utility model.

[0041] Figure 3 FIG. is a schematic structural diagram of the combination of the fixing structures according to the present utility model.

[0042] Figure 4 FIG. is a schematic structural diagram of the connection between the fixing structure and the internal support structure according to the present utility model.

[0043] Figure 5 FIG. is a schematic structural diagram of the cofferdam unit.

[0044] Figure 6 FIG. is a schematic structural diagram of a partial structure of the cofferdam unit.

[0045] Figure 7 For Figure 6 FIG. from another perspective.

[0046] Figure 8 FIG. is a schematic structural diagram of the steel column in the corner connection unit.

[0047] Figure 9 FIG. is a schematic structural diagram of the wedge-shaped solid steel corner.

[0048] Figure 10 FIG. is a schematic structural diagram of the counterweight settlement unit.

[0049] Figure 11 FIG. is a schematic structural diagram of the counterweight settlement unit from another perspective.

[0050] Figure 12 FIG. is a schematic sectional structural diagram of the counterweight settlement unit.

[0051] Figure 13 FIG. is a schematic structural diagram of the fixing structure.

[0052] Figure 14 FIG. is a schematic structural diagram of the sealed airbag.

[0053] Figure 15 FIG. is a schematic structural diagram of the sealing strip.

[0054] Figure 16 It is a structural schematic diagram of the internal support structure.

[0055] In the attached drawings: 1. Cofferdam unit; 101. Hollow steel plate;

[0056] 102. Fixed structure; 1021. Adjusting rod; 1022. Cross connecting sleeve; 1023. Fixed seat; 1024. External threaded column;

[0057] 103. Sealing airbag; 104. First limiting column; 105. First limiting card slot; 106. Sealing groove; 107. Sealing strip; 108. First guiding strip; 109. First guiding groove; 110. Guide wheel; 111. Connecting seat; 112. Water injection hole; 113. Drain pipe;

[0058] 2. Corner connection unit; 201. Steel column; 202. Wedge-shaped solid steel corner; 203. Second limiting column; 204. Second limiting card slot; 205. Second guiding strip; 206. Second guiding groove; 207. Connecting plate; 208. Connecting slot; 209. Connecting convex block;

[0059] 3. Counterweight settlement unit; 301. Box body; 302. Installation card slot; 303. Cement pouring pipe; 304. Groove; 305. Sealing plate; 306. Flange;

[0060] 4. Internal support structure; 401. Support plate; 402. Rotating seat; 403. Sliding groove; 404. Slider; 405. Locking bolt; 406. Adjustable support rod;

[0061] 5. Sealing ring. Specific embodiments

[0062] In order to better understand the technical solution of the present application, the embodiments of the present application will be described in detail below with reference to the attached drawings.

[0063] It should be clear that the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0064] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms of "a", "the" and "said" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0065] It should be understood that the term "and / or" used herein is merely a description of the association relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this text generally indicates that the associated objects before and after are in an "or" relationship.

[0066] It should be noted that the orientation terms such as "upper", "lower", "left", and "right" described in the embodiments of this application are described from the perspective shown in the drawings and should not be construed as limitations on the embodiments of this application. In addition, in the context, it should also be understood that when it is mentioned that one component is connected "above" or "below" another component, it can not only be directly connected "above" or "below" another component, but also be indirectly connected "above" or "below" another component through an intermediate component.

[0067] Embodiment 1: This embodiment is a steel cofferdam structure for assisting in the construction of deep-water foundations, including 4 corner connection units 2 located at the 4 corners of the steel cofferdam structure, and a cofferdam wall body arranged between adjacent two corner connection units 2.

[0068] In this example, the cofferdam wall body includes two cofferdam units 1, and the cofferdam unit 1 is spliced by 6 hollow steel plates 101 in three rows and two columns. A weight settlement unit 3 is connected to the lower end of the cofferdam unit.

[0069] In this embodiment, a first limit post 104 is fixed on one side of the hollow steel plate 101, a first limit card slot 105 matching the first limit post 104 is opened on the other side of the hollow steel plate 101, and a sealing airbag 103 is arranged in the first limit card slot 105 and sleeved on the first limit post 104.

[0070] In this example, a top sealing structure and a bottom sealing structure that can cooperate with each other to achieve sealing are respectively provided at the top and bottom of the hollow steel plate 101. The top sealing structure and the bottom sealing structure are respectively provided with sealing grooves 106 at the top and bottom of the hollow steel plate 101, and sealing strips 107 are filled in the sealing grooves 106.

[0071] In this embodiment, the sealing groove 106 includes two straight sealing grooves and one arc sealing groove. The two straight sealing grooves are respectively located on the inner and outer sides of the end face, and the straight sealing grooves extend from the left end to the right end of the hollow steel plate; the arc sealing groove corresponds to the first limit card slot and connects the two straight sealing grooves.

[0072] In this example, the depth of the sealing groove 106 is half of the height of the sealing strip 107. The sealing strip 107 extends beyond the sealing groove 106, which can play a role in connecting the upper and lower hollow steel plates 101 and achieve a good sealing effect. The sealing strip 107 is composed of two parallel straight rubber strips and an arc rubber strip connecting the two rubber strips. The sealing strip 107 is integrally formed to ensure its sealing effect.

[0073] In this embodiment, on one side of the hollow steel plate 101 where the first limiting post 104 is fixed and on one side where the first limiting card slot 105 is provided, there are fixedly installed mutually matching first guiding strips 108 and first guiding grooves 109. A number of guiding wheels 110 that cooperate with the first guiding strips 108 are installed in the first guiding grooves 109. An arc-shaped groove that cooperates with the first guiding strips 108 is provided on the surface of the guiding wheels 110. During use, it can fit with the first guiding strips 108, thereby playing a role in limiting and guiding, facilitating the installation between the two hollow steel plates 101 and between the hollow steel plate 101 and the steel column 201, reducing the friction between adjacent two hollow steel plates 101 during installation, and improving the smoothness of installation.

[0074] In this embodiment, connection seats 111 are fixedly installed at the top and bottom of the inner side surface of the hollow steel plate 101. The connection seats 111 can be connected to the support and fixation mechanism arranged inside the steel cofferdam structure.

[0075] In this example, the support and fixation mechanism includes a fixation structure 102 and an inner support structure 4. The fixation structure 102 includes an adjustment rod 1021. Cross connection sleeves 1022 are fixedly installed at both ends of the adjustment rod 1021. A fixation seat 1023 is fixedly installed on the cross connection sleeves 1022. An external threaded post 1024 that penetrates the connection seat 111 is fixedly installed on the fixation seat 1023. A locking nut is threadedly connected to the top end of the external threaded post 1024. The cross connection sleeves 1022 extend in four directions. It can not only connect the fixation seats 1023 in the up and down directions into an integral structure through the adjustment rod 1021, but also connect the fixation seats 1023 on the left and right sides into an integral structure, so that the fixation structure 102 inside the cofferdam maintains the characteristics of an integral structure, thereby improving the stability of its internal fixation.

[0076] In this embodiment, the inner support structure 4 is installed inside the cofferdam wall body. The inner support structure 4 includes a support plate 401 installed on the adjustment rod 1021. A rotating seat 402 that is rotatably connected to the adjustment rod 1201 is fixedly installed on one surface of the support plate 401. A sliding groove 403 is provided on the other surface of the support plate 401. A sliding block 404 is slidably connected in the sliding groove 403. A locking bolt 405 whose one end abuts against the inner bottom of the sliding groove 403 penetrates through the sliding block 404. One end of the sliding block 404 located outside the sliding groove 403 is hinged with an adjustable support rod 406.

[0077] In this embodiment, the corner connection unit 2 includes a steel column 201 and a wedge-shaped solid steel corner 202. A second limiting column 203 that cooperates with the first limiting groove 105 is fixed on the first side surface of the steel column 201, and a second limiting groove 204 that cooperates with the first limiting column 104 is opened on the second side surface. In this example, the first and second sides are perpendicular.

[0078] In this embodiment, the steel column 201 is provided with a second guide bar 205 and a second guide groove 206 which respectively cooperate with the first guide bar 108 and the first guide groove 109. The second guide groove 206 is also installed with a guide wheel 110. The top and bottom of the steel column 201 are fixed with connecting plates 207 with bolt holes. The steel column 201 is fixedly connected to the wedge-shaped solid steel corner 202 by bolts. The wedge-shaped solid steel corner 202 is provided with a connecting slot 208 and a connecting protrusion 209 which cooperate with the counterweight sinking unit 3.

[0079] In this example, a sealing ring 5 is provided between two adjacent counterweight settling units 3, and the sealing ring 5 ensures the sealing between two adjacent boxes 301. The counterweight settling unit 3 includes a box 301 with a right-angle trapezoidal cross section, and a mounting slot 302 is fixed on the top of the box 301 to cooperate with the hollow steel plate 101, the first guide bar 108, and the first guide groove 109. A groove 304 is provided at one end of the box 301 to cooperate with the connecting protrusion 209, and a flange 306 is fixed at the other end of the box 301 to cooperate with the groove 304. The sealing ring 5 is sleeved on the flange 306 and its two ends are respectively pressed against the sides of the two adjacent boxes 301.

[0080] In this embodiment, the sealing airbag 103 is composed of an arc segment and two straight edge segments connecting the arc segments. Outward-turned side edges are fixed on the two straight edge segments. The outward-turned side edges are away from the straight edge segments and contact the first guide strip 108 by passing through the first limiting slot 105. The sealing airbag 103 extends outward from the first limiting slot 105, which can fully fill the gap formed when the two adjacent hollow steel plates 101 are spliced, thereby improving the tightness and sealing of the connection between the two adjacent hollow steel plates 101.

[0081] The construction method of the steel cofferdam structure used for auxiliary construction of deepwater foundation in this embodiment specifically includes the following steps:

[0082] S1: Install the cofferdam assembly platform according to the size of the designed cofferdam, use a crawler crane to lift the box 301 and the wedge-shaped solid steel corner 202 to the cofferdam assembly platform, and assemble them in pairs in sequence. Assemble multiple boxes 301 in sequence to form the counterweight settlement unit 3 at the bottom, and multiple counterweight settlement units 3 cooperate with the wedge-shaped solid steel corner 202 at the corner to form the bottom blade of the cofferdam;

[0083] S2: Use a crawler crane to symmetrically install the hollow steel plates 101 below into the installation slots 302 in sequence. At the corner, the steel column 201 that cooperates with the hollow steel plate 101 below. During the lowering process, the first limit post 104 extends into the first limit slot 105 on the adjacent hollow steel plate 101, and the first guide bar 108 extends into the first guide groove 109 on the adjacent hollow steel plate 101;

[0084] S3: After lowering one layer of hollow steel plates 101 and steel columns 201, fixedly connect the hollow steel plates 101 and steel columns 201 to the box body 301 and the wedge-shaped solid steel corner 202 in S1 through bolts. Then, fill the sealing airbag 103 into the gap between the first limit post 104 and the first limit slot 105, and then inflate the sealing airbag 103 to make it expand, completing the sealing of the gap between two adjacent hollow steel plates 101;

[0085] S4: Install the upper-layer hollow steel plates 101 and steel columns 201 to the designed height of the cofferdam in sequence according to the construction steps in S2. At the same time, connect and fix the hollow steel plates 101 of different layers through the fixing structure 102 to form a cofferdam wall body;

[0086] S5: Install the corresponding internal support structure 4 inside the cofferdam wall body according to the height of the cofferdam. After completing the installation of the cofferdam;

[0087] S6: Lower the cofferdam according to the construction steps.

[0088] Embodiment 2: This embodiment is basically the same as Embodiment 1, except that in this example, the adjusting rod 1021 includes an adjusting sleeve. Threaded connection rods are provided at both ends of the sleeve. A connection block that cooperates with the cross connection sleeve 1022 is fixed at one end of the connection rod away from the sleeve. A limit ring that cooperates with the rotating seat 402 is fixed at the middle position of the outer circular surface of the sleeve. The adjusting rod 1021 can be adjusted to extend or shorten according to the connection length at both ends. By rotating the adjusting sleeve, the connection rods at both ends are controlled to move, improving the applicable range of the fixing structure 102.

[0089] In this embodiment, the adjustable support rod 406 includes an internally threaded sleeve. External threaded rods are threadedly connected to both ends of the internally threaded sleeve. A hinge seat that is hinged to the slider 404 is fixed at one end of the external threaded rod away from the internally threaded sleeve. By rotating the internally threaded sleeve, the external threaded rods at both ends are controlled to extend or shorten, and the steel cofferdam wall body can be supported from the inside. And due to its adjustable nature, it can be adjusted according to the deformation of the steel cofferdam wall body during use, ensuring the stability of its support for the steel cofferdam wall body.

[0090] Embodiment 3: This embodiment is basically the same as Embodiment 1, except that in this embodiment, a water injection hole 112 is provided at the top of the hollow steel plate 101, and a drain pipe 113 communicating with the inner cavity of the hollow steel plate 101 is fixed at the bottom of the hollow steel plate 101. The drain pipe 113 passes through the water injection hole 112 and extends into the hollow steel plate 101 of the next layer. Water can be injected into the hollow steel plate 101 through the water injection hole 112 to control the settlement of the entire cofferdam and control the height of the cofferdam exposed above the water surface.

[0091] A cement pouring pipe 303 communicating with the inner cavity of the box body 301 is fixed on one surface of the box body 301. The cement pouring pipe 303 is used to pour concrete into the box body 301 to form a concrete cutting edge. A cleaning port communicating with the inner cavity of the box body 301 is provided in the groove 304. The cleaning port is used to clean the concrete inside the box body 301 through the cleaning port after the cofferdam is demolished, so as to facilitate the subsequent reuse of the box body 301, and the recycling use after the cofferdam is demolished can be realized to reduce the construction cost. A sealing plate 305 matching with the inner cavity of the cleaning port is fixed at the bottom of the groove 304 by bolts.

Claims

1. A steel cofferdam structure for auxiliary construction of deepwater foundation, characterized by: It includes a plurality of corner connection units located at the corners of the steel cofferdam structure, and a cofferdam wall body arranged between two adjacent corner connection units; The cofferdam wall body includes at least one cofferdam unit, which is formed by splicing a number of hollow steel plates; The right side of the hollow steel plate is provided with a first limiting post, the left side of the hollow steel plate is provided with a first limiting slot that can cooperate with the first limiting post, and the first limiting slot is provided with a sealing airbag that matches the gap between the first limiting slot and the first limiting post; The top of the hollow steel plate is provided with a top sealing structure, and the bottom of the hollow steel plate is provided with a bottom sealing structure that can cooperate with the top sealing structure to achieve sealing; At least one connecting seat is fixed on the inner side surface of the hollow steel plate; a supporting and fixing mechanism is provided inside the steel cofferdam structure, and the supporting and fixing mechanism is fixedly connected to the connecting seats of each hollow steel plate on the steel cofferdam structure.

2. The steel cofferdam structure for auxiliary construction of deepwater foundation according to claim 1 is characterized in that: A first guide bar and a first guide groove are respectively arranged on the hollow steel plates on both sides of the first limiting column, and a first guide groove and a first guide bar are respectively arranged on the hollow steel plates on both sides of the first limiting slot, and the first guide groove is adapted to the first guide bar.

3. The steel cofferdam structure for auxiliary construction of deepwater foundation according to claim 2 is characterized in that: A plurality of guide wheels which can cooperate with the first guide strip are installed in the first guide groove.

4. The steel cofferdam structure for auxiliary construction of deepwater foundation according to claim 1 is characterized in that: A counterweight settling unit is provided at the lower end of the cofferdam unit, and a sealing ring is provided between two adjacent counterweight settling units.

5. The steel cofferdam structure for auxiliary construction of deepwater foundation according to claim 4 is characterized in that: The counterweight settlement unit comprises a box body with a right-angle trapezoidal cross section, a mounting slot which can cooperate with a hollow steel plate is fixed on the top of the box body, and a cement pouring pipe which is connected with the inner cavity of the box body is fixed on one surface of the box body.

6. The steel cofferdam structure for auxiliary construction of deepwater foundation according to claim 5 is characterized by: A groove is arranged at one end of the box body, and a flange matched with the groove is fixed at the other end of the box body. The sealing ring is sleeved on the flange and its two ends are respectively pressed against two adjacent side surfaces of the box body.

7. The steel cofferdam structure for auxiliary construction of deepwater foundation according to claim 6 is characterized by: A cleaning port communicating with the inner cavity of the box body is provided in the groove, and a sealing plate cooperating with the inner cavity of the cleaning port is fixed to the bottom of the groove by bolts.

8. The steel cofferdam structure for auxiliary construction of deepwater foundation according to claim 2 is characterized by: The corner connection unit comprises a steel column, a second limiting column capable of cooperating with the first limiting slot is provided on a first side surface of the steel column, and a second guide strip and a second guide slot are respectively provided on inner and outer sides of the second limiting column; A second limiting slot that can cooperate with the first limiting column is provided on the second side surface of the steel column, and a second guide slot and a second guide strip are provided on the inner and outer sides of the second limiting slot respectively; The second guide strip can cooperate with the first guide groove, and the second guide groove can cooperate with the first guide strip.

9. The steel cofferdam structure for auxiliary construction of deepwater foundation according to claim 8 is characterized in that: The bottom end of the steel column is connected with a wedge-shaped solid steel corner, and the wedge-shaped solid steel corner is provided with a connecting slot and a connecting protrusion that can cooperate with the counterweight settlement unit at the lower end of the cofferdam unit.

10. The steel cofferdam structure for auxiliary construction of deepwater foundation according to claim 1, characterized in that: The top sealing structure and the bottom sealing structure both have sealing grooves opened on the end surfaces of the hollow steel plates, and the sealing grooves are filled with sealing strips; The sealing groove includes two linear sealing grooves and one arc sealing groove. The two linear sealing grooves are respectively located on the inner and outer sides of the end faces, and the linear sealing grooves extend from the left end to the right end of the hollow steel plate. The arc sealing groove is arranged corresponding to the first limit slot and connects the two linear sealing grooves.

11. The steel cofferdam structure for auxiliary construction of deepwater foundation according to claim 1, characterized in that: The supporting and fixing mechanism comprises a fixing structure and an inner supporting structure; The fixing structure comprises an adjusting rod, both ends of which are fixed with a cross connecting sleeve, a fixing seat is fixed on the cross connecting sleeve, an external thread column which can penetrate the connecting seat on the hollow steel plate is fixed on the fixing seat, and a locking nut is threadedly connected to the top of the external thread column; The inner support structure includes a support plate installed on the adjusting rod, a swivel seat rotatably connected to the adjusting rod is fixed on one surface of the support plate, a slide groove is opened on the other surface of the support plate, a slider is slidably connected in the slide groove, a locking bolt with one end pressed against the bottom of the slide groove is passed through the slider, and an adjustable support rod is hinged at one end of the slider located outside the slide groove.

12. The steel cofferdam structure for auxiliary construction of deepwater foundation according to claim 11, characterized in that: The adjusting rod comprises an adjusting sleeve, both ends of the sleeve are threadedly connected with connecting rods, one end of the connecting rod away from the sleeve is fixed with a connecting block that cooperates with a cross connecting sleeve, and a limiting ring that cooperates with a swivel seat is fixed in the middle position of the outer circumferential surface of the sleeve.

13. The steel cofferdam structure for auxiliary construction of deepwater foundation according to claim 11, characterized in that: The adjustable support rod comprises an internal threaded sleeve, both ends of the internal threaded sleeve are threadedly connected with external threaded rods, and one end of the external threaded rod away from the internal threaded sleeve is fixed with a hinge seat hinged to the slider.

14. The steel cofferdam structure for auxiliary construction of deepwater foundation according to claim 1, characterized in that: The top of the hollow steel plate is provided with a water inlet connected with the interior thereof, and the bottom of the hollow steel plate is connected with a drainage pipe connected with the interior thereof, and the drainage pipe can be plugged and matched with the water inlet on the top of the hollow steel plate below.

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