Underwater tower crane foundation cofferdam

Abstract

The utility model discloses an underwater tower crane foundation cofferdam, which is characterized in that an embedded plate with a hollow square structure is laid on the surface of a main pier bearing platform, anchor bars are embedded in the main pier bearing platform, the anchor bars vertically and upwards extend to be connected with the embedded plate, a cofferdam structure is arranged above the embedded plate, and the cofferdam structure is arranged above the main pier bearing platform. The cofferdam structure comprises a steel coaming with the cross section of a square structure, a ring beam equal to the steel coaming in width and a vertical beam equal to the steel coaming in height, the steel coaming is perpendicularly connected to the surface of the embedded plate, the ring beam is connected to the outer side of the steel coaming in the horizontal direction, the vertical beam is connected to the outer side of the steel coaming in the vertical direction, and the ring beam and the vertical beam are perpendicularly arranged in a staggered mode. The tower crane foundation for mounting the tower crane is enclosed on the main pier bearing platform, so that the tower crane foundation is lower than a riverbed surface and is positioned in a water-free environment, and the potential safety hazard of corrosion caused by soaking in water is eliminated. In addition, the cofferdam structure is convenient to transport and mount, and can be dismounted by adopting underwater cutting, so that the construction efficiency is improved, and meanwhile, the cofferdam structure has good strength and rigidity.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge engineering construction, in particular to an underwater tower crane foundation cofferdam. Background Art

[0002] In the construction of underwater bridges, tower cranes are usually used as lifting equipment. In order to meet the navigation requirements of cross-river bridges, the pedestal needs to be set below the navigation water level. For this kind of construction, steel structures and concrete are often used to build an overhead pedestal as the foundation of the tower crane. However, the steel structure that supports the tower crane needs to have very good mechanical properties, and its construction cost is relatively high. In addition, there is a safety hazard of water corrosion in the tower crane foundation.

[0003] Patent No. 202220194133.7 discloses a waterproof structure for a tower crane foundation in water, wherein the tower crane foundation is anchored on a water pedestal, and a steel casing is set on the periphery of the tower crane foundation. The upper end of the steel casing is higher than the water level in the construction area, and multiple brackets are welded equidistantly on the inner wall of the lower end of the steel casing. Each bracket is anchored on the pedestal through anchor bars pre-buried in the pedestal, and a concrete ring beam group is cast close to the outer wall of the steel casing at the lower end of the steel casing. The concrete ring beam group is cast as one with the pedestal concrete, which can ensure that the tower crane foundation is always in a waterless environment and prevent the tower crane foundation from being corroded by water. However, the above patent scheme design requires the use of water casting to establish a concrete ring beam group, which increases the difficulty of construction and is difficult to dismantle, which is not conducive to construction efficiency. In addition, the steel casing is inconvenient to transport and troublesome to install, and the pressure load it can withstand is limited. It cannot provide sufficient strength and rigidity, and is prone to compression deformation. Summary of the invention

[0004] The utility model aims to solve the shortcomings in the prior art and proposes an underwater tower crane foundation cofferdam.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A cofferdam for an underwater tower crane foundation comprises a main pier cap located in water, characterized in that: the surface of the main pier cap is paved with an embedded plate of a U-shaped structure, anchor bars are embedded inside the main pier cap, the anchor bars extend vertically upward to be connected to the embedded plate, a cofferdam structure is installed above the embedded plate, the cofferdam structure comprises a steel enclosure plate with a U-shaped cross-section, a ring beam with the same width as the steel enclosure plate, and a vertical beam with the same height as the steel enclosure plate, the steel enclosure plate is vertically connected to the surface of the embedded plate, the ring beam is horizontally connected to the outer side of the steel enclosure plate, the vertical beam is vertically connected to the outer side of the steel enclosure plate, and the ring beam and the vertical beam are vertically staggered.

[0007] Preferably, the distance between the inner side of the steel enclosure and the inner side of the embedded plate is A, the distance between the outer side of the steel enclosure and the outer side of the embedded plate is B, and A is equal to B.

[0008] Preferably, each side wall of the steel enclosure is installed with three ring beams, which are arranged at intervals in the vertical direction and are respectively installed at the upper part, middle part and lower part of the steel enclosure.

[0009] Preferably, each side wall of the steel enclosure is installed with three vertical beams, one of which is located on the longitudinal bisector of the steel enclosure side wall, and the other two vertical beams are symmetrically arranged on both sides of the longitudinal bisector of the steel enclosure side wall.

[0010] Preferably, embedded legs are embedded inside the main pier cap, and the embedded legs extend vertically upward to protrude out of the surface of the main pier cap, and the embedded legs are correspondingly installed at the four corners of the inner side of the embedded plate.

[0011] Preferably, a vertically arranged I-beam is provided below the embedded leg, channel steel is connected between the I-beams, support plates are provided at the top and bottom ends of the I-beams respectively, and the I-beam is connected to the embedded leg through the support plates.

[0012] Preferably, a crisscross steel frame is provided inside the main pier cap, and the leg support frame is connected to the steel frame.

[0013] Preferably, an L-shaped plate is connected between the steel enclosure plate and the embedded plate, a rib plate is connected to the inner side of the L-shaped plate, and the bottom of the L-shaped plate is connected to the anchor bar.

[0014] Preferably, the embedded plate and the L-shaped plate are respectively provided with through holes for the anchor bars to pass through, the anchor bars are inserted into the through holes, and a rubber sleeve is provided between the through holes, and the ends of the anchor bars extend from the L-shaped plate and are screwed and fixed with nuts.

[0015] Preferably, the surface of the embedded plate is provided with an installation groove, which is distributed in a U-shape and matched with the bottom of the steel enclosure. The steel enclosure is inserted into the installation groove and filled with waterproof filler.

[0016] The utility model has the following beneficial effects:

[0017] The utility model welds the embedded plate to the surface of the main pier cap by anchoring, and installs a cofferdam structure above the embedded plate, so as to enclose the tower crane foundation for the tower crane installation on the main pier cap, so that the tower crane foundation is lower than the riverbed surface, meeting the navigation requirements of cross-river and cross-river bridges, and the tower crane foundation is in a waterless environment, which is convenient for staff to inspect and maintain, and eliminates the safety hazard of water corrosion. In addition, the cofferdam structure adopts a combination structure of steel enclosure plates, ring beams, and vertical beams, which is easy to transport and install. Underwater cutting can be used for dismantling, which improves construction efficiency. At the same time, it has good strength and rigidity, can bear greater lateral load pressure, and avoid compression deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The main view of the cofferdam of the underwater tower crane foundation of the utility model

[0019] Figure 2 A top view of the cofferdam of the underwater tower crane foundation of the utility model

[0020] Figure 3 This is a schematic diagram of the assembly of the embedded legs and the main pier cap described in the utility model

[0021] Figure 4 This is a schematic diagram of the assembly of the embedded plate and the steel enclosure described in the utility model

[0022] Figure 5 Schematic diagram of the elevation of the cofferdam of the underwater tower crane foundation described in the utility model

[0023] Description of the drawings: main pier cap 1, embedded plate 2, anchor bar 3, steel enclosure 4, ring beam 5, vertical beam 6, embedded support leg 7, I-beam 8, channel steel 9, support plate 10, L-shaped plate 11, rib plate 12, rubber sleeve 13, nut 14, installation groove 15. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] Reference Figures 1 to 4 , an embodiment provided by the utility model:

[0026] A cofferdam for an underwater tower crane foundation comprises a main pier cap 1 located in water, the surface of the main pier cap 1 is paved with an embedded plate 2 of a U-shaped structure, anchor bars 3 are embedded inside the main pier cap 1, the anchor bars 3 extend vertically upward to be connected to the embedded plate 2, a cofferdam structure is installed above the embedded plate 2, the cofferdam structure comprises a steel enclosure 4 with a U-shaped cross-section, a ring beam 5 arranged with the same width as the steel enclosure 4, and a vertical beam 6 arranged with the same height as the steel enclosure 4, the steel enclosure 4 is vertically connected to the surface of the embedded plate 2, the ring beam 5 is connected to the outer side of the steel enclosure 4 in the horizontal direction, the vertical beam 6 is connected to the outer side of the steel enclosure 4 in the vertical direction, and the ring beam 5 and the vertical beam 6 are vertically staggered.

[0027] The cofferdam of the underwater tower crane foundation includes a main pier cap 1, an embedded plate 2, anchor bars 3, and a cofferdam structure. The main pier cap 1 is located in the water, lower than the riverbed surface. The tower crane is directly installed on the main pier cap 1. Compared with the conventional design, no independent tower crane foundation is set, and there is no need to worry about stability issues. The embedded plate 2 is a U-shaped structure, which is laid flat on the surface of the main pier cap 1, and the two are horizontally attached to each other. The anchor bar 3 is buried inside the main pier cap 1 and is set vertically upward. The end of the anchor bar 3 extends from the surface of the main pier cap 1 and is connected to the embedded plate 2. The embedded plate 2 and the anchor bar 3 can be welded and fixed to fix the embedded plate 2 on the surface of the main pier cap 1. The cofferdam structure is installed above the embedded plate 2, set around the embedded plate 2, and is perpendicular to the embedded plate 2. The cofferdam structure encloses the main pier cap 1. The main pier cap 1 area corresponding to the inner side of the cofferdam structure serves as the tower crane foundation. The cofferdam structure plays a water-isolating role to prevent the tower crane foundation from being soaked in water.

[0028] The cofferdam structure includes a steel enclosure 4, a ring beam 5, and a vertical beam 6. The cross section of the steel enclosure 4 is a square structure, consisting of four mutually vertically welded steel plates, matching the size of the embedded plate 2, and can be installed between the inner and outer sides of the embedded plate 2. The bottom of the steel enclosure 4 is vertically connected to the surface of the embedded plate 2, and the steel enclosure 4 and the embedded plate 2 can be welded and fixed, and sealed to play a role in water isolation, waterproofing, and anti-seepage.

[0029] The ring beam 5 is a horizontal bar structure, which is set horizontally, and can include several beams set at intervals in the vertical direction. The ring beam 5 is set with the same width as the steel enclosure 4. The ring beam 5 is connected to the outer side of the steel enclosure 4. The ring beam 5 and the steel enclosure 4 can be welded and fixed to provide lateral support for the steel enclosure 4 and bear the lateral load pressure. The vertical beam 6 is a straight bar structure, which is set vertically, and can include several beams set at intervals in the horizontal direction. The vertical beam 6 and the steel enclosure 4 are set at the same height. The vertical beam 6 is connected to the outer side of the steel enclosure 4. The vertical beam 6 and the steel enclosure 4 can be welded and fixed to improve the strength and rigidity of the steel enclosure 4 and avoid the steel enclosure 4 from being deformed under pressure. In addition, in order to provide structural stability between the ring beam 5 and the vertical beam 6, the two are vertically staggered, and can be spliced ​​and installed with each other to form a mesh structure as a whole, which is connected to the outer side of the steel enclosure 4.

[0030] The utility model anchors and welds the embedded plate 2 to the surface of the main pier cap 1, and installs a cofferdam structure above the embedded plate 2, so as to enclose a tower crane foundation for tower crane installation on the main pier cap 1, so that the tower crane foundation is lower than the riverbed surface, meeting the navigation requirements of cross-river and cross-river bridges, and the tower crane foundation is in a waterless environment, which is convenient for staff to inspect and maintain, and eliminates the safety hazard of water corrosion. In addition, the cofferdam structure adopts a combined structure of steel enclosure plates 4, ring beams 5, and vertical beams 6, which is easy to transport and install. Underwater cutting can be used for dismantling, which improves construction efficiency. At the same time, it has good strength and rigidity, can bear greater lateral load pressure, and avoids compression deformation.

[0031] In this embodiment, as a preference, the distance between the inner side of the steel enclosure 4 and the inner side of the embedded plate 2 is A, the distance between the outer side of the steel enclosure 4 and the outer side of the embedded plate 2 is B, and A is equal to B.

[0032] The surface of the embedded plate 2 is a U-shaped structure, and the bottom of the steel enclosure 4 is a U-shaped structure. The distance between the inner side of the steel enclosure 4 and the inner side of the embedded plate 2 is A, and the distance between the outer side of the steel enclosure 4 and the outer side of the embedded plate 2 is B. A is equal to B, so that the distance from the steel enclosure 4 to the inner and outer sides of the embedded plate 2 is equal. After the embedded plate 2 and the steel enclosure 4 are welded and fixed, it is beneficial to balance the forces on the inner and outer sides of the embedded plate 2, and deformation is not easy to occur.

[0033] In the present embodiment, preferably, each side wall of the steel enclosure 4 is installed with three ring beams 5, and the ring beams 5 are arranged at intervals along the vertical direction and are respectively installed at the upper part, the middle part and the lower part of the steel enclosure 4.

[0034] There are twelve ring beams 5, all of which are placed horizontally and installed at intervals in the vertical direction. Three ring beams 5 are installed on each side wall of the steel enclosure 4, which are respectively installed on the upper, middle and lower parts of the steel enclosure 4. One of the ring beams 5 can be located on the transverse bisector of the side wall of the steel enclosure 4, and the other two ring beams 5 are symmetrically arranged on both sides of the transverse bisector of the side wall of the steel enclosure 4. The ring beams 5 are welded and fixed to the steel enclosure 4, further providing lateral support for the steel enclosure 4, and can withstand greater lateral load pressure.

[0035] In this embodiment, preferably, each side wall of the steel enclosure 4 is installed with three vertical beams 6, one of which is located at the longitudinal bisector of the side wall of the steel enclosure 4, and the other two vertical beams 6 are symmetrically arranged on both sides of the longitudinal bisector of the side wall of the steel enclosure 4.

[0036] There are twelve vertical beams 6, all of which are placed vertically and installed at intervals in the horizontal direction. Three vertical beams 6 are installed on each side wall of the steel enclosure panel 4. One of the vertical beams 6 can be located on the longitudinal bisector of the side wall of the steel enclosure panel 4, and the other two vertical beams 6 are symmetrically arranged on both sides of the longitudinal bisector of the side wall of the steel enclosure panel 4. The vertical beams 6 are welded and fixed to the steel enclosure panel 4, which further improves the strength and rigidity of the steel enclosure panel 4 and can provide greater anti-deformation ability.

[0037] In this embodiment, as a preference, embedded legs 7 are buried inside the main pier cap 1 , and the embedded legs 7 extend vertically upward to extend out of the surface of the main pier cap 1 , and the embedded legs 7 are correspondingly installed at the four corners of the inner side of the embedded plate 2 .

[0038] The embedded legs 7 are used as installation components of the tower crane and are used to be installed and fixed with the bottom of the tower crane. The embedded legs 7 are buried inside the main pier cap 1 and are arranged vertically upward. When the main pier cap 1 is being poured, the embedded legs 7 are placed inside the main pier cap 1. After the concrete pouring is completed, the top of the embedded legs 7 extends from the surface of the main pier cap 1, playing a good supporting role. There are four embedded legs 7, which are installed at the four corners of the inner side of the embedded plate 2. Sufficient installation distance is reserved between the embedded legs 7 and the steel enclosure 4 to avoid affecting the subsequent installation of the tower crane.

[0039] In this embodiment, as a preference, a vertically arranged I-beam 8 is provided below the embedded leg 7, a channel steel 9 is connected between the I-beams 8, support plates 10 are provided at the top and bottom ends of the I-beam 8 respectively, and the I-beam 8 is connected to the embedded leg 7 through the support plate 10.

[0040] The I-beam 8 is located below the embedded legs 7 and is buried inside the main pier cap 1 together with the embedded legs 7. The I-beam 8 is vertically arranged and aligned with the axis of the embedded legs 7. There are four I-beams 8, which correspond one to one with the embedded legs 7. The I-beams 8 are connected and fixed by channel steels 9 to improve the stability of the structure. The support plate 10 is located at the top and bottom ends of the I-beam 8 to increase the force-bearing area. The I-beam 8 is connected to the embedded legs 7 through the support plate 10. When the main pier cap 1 is being poured, the embedded legs 7 and the I-beam 8 are installed and fixed, kept upright in a suspended manner, and placed as a whole inside the main pier cap 1 and poured with concrete. By adding the combined structure of the I-beam 8, the channel steel 9, and the support plate 10, the contact with the concrete is more sufficient and the structural stability is stronger.

[0041] In this embodiment, as a preference, a crisscross steel bar skeleton is provided inside the main pier cap 1, and the leg support frame is connected to the steel bar skeleton.

[0042] The steel skeleton is located inside the main pier cap 1 and is arranged in a crisscross pattern to increase the strength of the main pier cap 1. When the main pier cap 1 is cast, the embedded legs 7 are fixed to the I-beams 8 to keep it upright in a suspended manner. The I-beams 8 are connected and fixed to the steel skeleton inside the main pier cap 1 and poured with concrete to further improve the structural stability and adapt to large-sized tower cranes.

[0043] In this embodiment, preferably, an L-shaped plate 11 is connected between the steel enclosure 4 and the embedded plate 2 , a rib plate 12 is connected to the inner side of the L-shaped plate 11 , and the bottom of the L-shaped plate 11 is connected to the anchor bar 3 .

[0044] The L-shaped plate 11 is located between the steel enclosure 4 and the embedded plate 2, and can be evenly arranged or installed at intervals along the embedded plate 2. The rib plate 12 is located inside the L-shaped plate 11, connecting the vertical surface and the horizontal surface of the L-shaped plate 11, and improving the structural strength of the L-shaped plate 11. The vertical surface of the L-shaped plate 11 is welded and fixed to the steel enclosure 4, and the horizontal surface of the L-shaped plate 11 is welded and fixed to the embedded plate 2, and is connected to the bottom of the L-shaped plate 11 and the anchor bar 3, which reinforces the steel enclosure 4 and the embedded plate 2, making the connection between the two more stable and firm.

[0045] In this embodiment, preferably, the embedded plate 2 and the L-shaped plate 11 are respectively provided with through holes for the anchor bar 3 to pass through, the anchor bar 3 is inserted into the through holes, and a rubber sleeve 13 is provided between the through holes, and the end of the anchor bar 3 extends from the L-shaped plate 11 and is screwed and fixed with the nut 14.

[0046] Through holes are respectively arranged on the surface of the embedded plate 2 and the horizontal plane of the L-shaped plate 11, which match the shape and position of the end of the anchor bar 3. After the anchor bar 3 extends from the surface of the main pier cap 1, it first penetrates from the through hole of the embedded plate 2, and then extends from the through hole of the L-shaped plate 11. The anchor bar 3 is inserted into the through hole, which can improve the positioning accuracy of the embedded plate 2 and the L-shaped plate 11. The rubber sleeve 13 is installed in the through hole, and the length of the rubber sleeve 13 can be equal to the thickness of the surface of the embedded plate 2 plus the thickness of the horizontal plane of the L-shaped plate 11. The rubber sleeve 13 passes through the through holes of the embedded plate 2 and the L-shaped plate 11, and the anchor bar 3 is inserted into the rubber sleeve 13. The rubber sleeve 13 can fill the gap between the anchor bar 3 and the through hole to achieve interference fit and improve installation tightness and waterproofness. An external thread is provided on the outside of the anchor bar 3. After the end of the anchor bar 3 extends out from the through hole of the L-shaped plate 11, the anchor bar 3 is threadedly connected with the nut 14. After the nut 14 is screwed and fixed to the anchor bar 3, a torque is further applied to the nut 14 through construction equipment, so that the embedded plate 2, the L-shaped plate 11 and the main pier cap 1 are more closely fitted, thereby improving the waterproof and anti-seepage capabilities.

[0047] In this embodiment, as a preference, an installation groove 15 is opened on the surface of the embedded plate 2, the installation groove 15 is distributed in a U-shape, and is matched with the bottom of the steel enclosure 4. The steel enclosure 4 is inserted into the installation groove 15 and filled with waterproof filler.

[0048] The installation groove 15 is located on the surface of the embedded plate 2, and is opened downward from the surface of the embedded plate 2, and is distributed in a square shape, matching the bottom of the steel enclosure 4. The installation groove 15 is filled with waterproof fillers, and the waterproof fillers can be waterproof glue. When installing the steel enclosure 4, the steel enclosure 4 is first suspended above the embedded plate 2, and after adjusting the installation position, the bottom of the steel enclosure 4 is inserted into the installation groove 15, and then the steel enclosure 4 is welded and fixed to the embedded plate 2. Adding the installation groove 15 transition between the steel enclosure 4 and the embedded plate 2 can play an assembly positioning role, so that the embedded plate 2 and the steel enclosure 4 are more closely fitted, while blocking water infiltration, and improving the waterproof and anti-seepage capabilities.

[0049] Reference Figure 5 The elevation schematic diagram of the utility model marks the elevation dimensions of the underwater tower crane foundation cofferdam, where: the top elevation of the steel enclosure is +13.03 meters, the historical highest water level is +12.85 meters, the elevations of the three ring beams are +11.53 meters, +8.53 meters, and +5.03 meters respectively, the surface elevation of the main pier cap is +3.53 meters, the top elevation of the embedded plate is +3.53 meters, the bottom elevation of the embedded plate is +3.33 meters, and the bottom elevation of the steel enclosure is +3.03 meters.

[0050] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An underwater tower crane foundation cofferdam, comprising a main pier cap located in water, characterized in that: The surface of the main pier cap is paved with an embedded plate of a U-shaped structure, and anchor bars are embedded inside the main pier cap, which extend vertically upward to be connected to the embedded plate. A cofferdam structure is installed above the embedded plate, and the cofferdam structure includes a steel enclosure with a U-shaped cross-section, a ring beam with the same width as the steel enclosure, and a vertical beam with the same height as the steel enclosure. The steel enclosure is vertically connected to the surface of the embedded plate, the ring beam is horizontally connected to the outer side of the steel enclosure, and the vertical beam is vertically connected to the outer side of the steel enclosure, and the ring beam and the vertical beam are vertically staggered.

2. The underwater tower crane foundation cofferdam according to claim 1, characterized in that: The distance between the inner side of the steel enclosure and the inner side of the embedded plate is A, the distance between the outer side of the steel enclosure and the outer side of the embedded plate is B, and A is equal to B.

3. The underwater tower crane foundation cofferdam according to claim 2, characterized in that: Each side wall of the steel enclosure is installed with three ring beams, which are arranged at intervals in the vertical direction and are respectively installed at the upper part, middle part and lower part of the steel enclosure.

4. The underwater tower crane foundation cofferdam according to claim 3, characterized in that: Each side wall of the steel enclosure is installed with three vertical beams, one of which is located on the longitudinal bisector of the side wall of the steel enclosure, and the other two vertical beams are symmetrically arranged on both sides of the longitudinal bisector of the side wall of the steel enclosure.

5. The underwater tower crane foundation cofferdam according to claim 1, characterized in that: Pre-embedded legs are embedded inside the main pier cap, and the pre-embedded legs extend vertically upward to protrude out of the surface of the main pier cap, and the pre-embedded legs are correspondingly installed at the four corners of the inner side of the embedded plate.

6. The underwater tower crane foundation cofferdam according to claim 5, characterized in that: A vertically arranged I-beam is provided below the embedded legs, channel steels are connected between the I-beams, support plates are provided at the top and bottom ends of the I-beams respectively, and the I-beams are connected to the embedded legs through the support plates.

7. The underwater tower crane foundation cofferdam according to claim 6, characterized in that: A crisscross steel frame is provided inside the main pier cap, and the leg support frame is connected to the steel frame.

8. The underwater tower crane foundation cofferdam according to claim 1, characterized in that: An L-shaped plate is connected between the steel enclosure plate and the embedded plate, a rib plate is connected to the inner side of the L-shaped plate, and the bottom of the L-shaped plate is connected to the anchor bar.

9. The underwater tower crane foundation cofferdam according to claim 8, characterized in that: The embedded plate and the L-shaped plate are respectively provided with through holes for anchor bars to pass through. The anchor bars are inserted into the through holes and a rubber sleeve is provided between the through holes. The ends of the anchor bars extend from the L-shaped plate and are screwed and fixed with nuts.

10. The underwater tower crane foundation cofferdam according to claim 9, characterized in that: The surface of the embedded plate is provided with an installation groove, which is distributed in a U-shape and matched with the bottom of the steel enclosure. The steel enclosure is inserted into the installation groove and filled with waterproof filler.

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