Pier column embedded bar fixing device based on cofferdam stand column

Abstract

The utility model provides a pier column embedded bar fixing device based on a cofferdam stand column, the fixing device comprises a pier column embedded bar fixing frame and a plurality of fixing columns, the pier column embedded bar fixing frame is arranged on the periphery of a pier column embedded bar in a surrounding mode, and the pier column embedded bar is partially inserted and fixed in a gap of a bearing platform steel bar located at the bottom of a cofferdam. The part, higher than the top of the bearing platform reinforcing steel bar, of the pier column embedded steel bar is limited and fixed by the pier column embedded steel bar fixing frame, the multiple fixing columns comprise drilling piles located below the bearing platform reinforcing steel bar and cofferdam stand columns partially poured in the drilling piles, and the tops of the cofferdam stand columns penetrate through the top face of the bearing platform reinforcing steel bar and are fixedly connected with the pier column embedded steel bar fixing frame; the cofferdam stand columns are arranged around the peripheries of the pier column embedded bars. The structure has the advantages that the cofferdam stand column is rooted in the drilled pile, the stability is high, the inner support can be effectively supported in the vertical direction, and the pier column embedded bar fixing frame can effectively fix the pier column embedded bars so as to avoid disturbance in the bearing platform pouring process.

Description

Technical Field

[0001] The utility model relates to the technical field of pier column construction, in particular to a pier column embedded reinforcement fixing device based on a cofferdam column. Background Art

[0002] The pier is the lower load-bearing object used to support the upper structure in civil engineering. The cross-section of the pier is mostly circular, but there are also special piers such as elliptical, square, curved, and parabolic. It is an important component in highway bridges, railway bridges, pedestrian bridges, overpasses, ramp bridges, and flyovers. In the existing pier construction process, due to the weak rigidity of the embedded reinforcement of the pier, it is difficult to stand on its own when the length is long, and it is easy to be disturbed during the pouring of the pedestal. If a fixed frame is set for fixation, the fixed frame will be poured together with the pedestal and cannot be recovered. In addition, internal supports need to be set in the cofferdam where the pier is located. As an axial load-bearing component, the internal support is subject to large forces and should be avoided from bearing vertical forces to reduce the deflection of the internal support. Utility Model Content

[0003] The purpose of the utility model is to provide a pier column pre-embedded reinforcement fixing device based on cofferdam columns in response to the above-mentioned deficiencies in the prior art. By casting the cofferdam columns in the bored piles, the cofferdam columns are used to form effective vertical supports for the inner supports, which can avoid the inner supports from bearing vertical forces. The cofferdam columns are used to fix the pier column pre-embedded reinforcement fixing frames, which can fix the pier column pre-embedded reinforcements through the pier column pre-embedded reinforcement fixing frames to avoid disturbance during the foundation casting process. The pier column pre-embedded reinforcement fixing frames can also be recovered after the pier column construction is completed, thereby reducing construction costs.

[0004] The purpose of this utility model is achieved by the following technical solutions:

[0005] A pier column embedded reinforcement fixing device based on cofferdam columns, the fixing device comprising a pier column embedded reinforcement fixing frame and a plurality of fixing columns arranged around the outer periphery of the pier column embedded reinforcement, part of the pier column embedded reinforcement is inserted and fixed in the gap of the base steel bar at the bottom of the cofferdam, the part of the pier column embedded reinforcement that is higher than the top of the base steel bar is limited and fixed by the pier column embedded reinforcement fixing frame, the fixing column comprises a bored pile located below the base steel bar and a cofferdam column partially cast in the bored pile, the top of the cofferdam column passes through the top surface of the base steel bar and is fixedly connected to the pier column embedded reinforcement fixing frame, and the cofferdam column is arranged around the outer periphery of the pier column embedded reinforcement.

[0006] The cofferdam columns are lattice steel columns.

[0007] The pier column embedded reinforcement fixing frame includes horizontally arranged supporting legs, which are inserted into the gaps between the cofferdam columns and are welded and fixed to the cofferdam columns.

[0008] A steel casing is provided on the periphery of the bored pile.

[0009] A ring beam and several inner supports for laterally supporting the ring beam are provided on the inner periphery of the top of the cofferdam. Some of the inner supports pass through the pier column embedded reinforcement and the pier column embedded reinforcement fixing frame. The top support of the cofferdam column fixes the bottom of the inner support.

[0010] The pier column embedded reinforcement fixing frame includes a plurality of fixing sections, and adjacent fixing sections are detachably connected by bolts at positions where they intersect with the inner support.

[0011] The inner supports include a plurality of transverse inner supports and a plurality of longitudinal inner supports. The plurality of transverse inner supports are arranged at intervals in the transverse direction, and the plurality of longitudinal inner supports are arranged at intervals in the longitudinal direction. The plurality of transverse inner supports intersect with the plurality of longitudinal inner supports and are fixedly connected to each other at the intersection.

[0012] A cushion layer is also provided below the foundation reinforcement.

[0013] A plurality of steel sheet piles are inserted at the boundary of the cofferdam to enclose the cofferdam.

[0014] A plurality of gusset plates are welded to the outer peripheral surface of the cofferdam column, and the plurality of gusset plates are arranged at intervals in the longitudinal direction of the cofferdam column.

[0015] The advantages of the utility model are: the cofferdam columns are rooted in the bored piles, have high stability, can form effective vertical support for the inner support, and prevent the inner support from bearing vertical force; the pier column embedded reinforcement fixing frame can effectively fix the pier column embedded reinforcement to avoid being disturbed during the foundation casting process; and the pier column can be recycled after the construction is completed, reducing construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the construction of bored piles in the present utility model;

[0017] Figure 2 This is a schematic diagram of excavation to a first preset depth in the present invention;

[0018] Figure 3 Schematic diagram of the ring beam and inner support in the present invention;

[0019] Figure 4 This is a schematic diagram of excavation to the bottom surface of the cushion layer in the present invention;

[0020] Figure 5 This is a schematic diagram of tying the cap steel bars and the pier column embedded bars in the present invention;

[0021] Figure 6 It is a schematic diagram of the pouring cap in the present utility model;

[0022] Figure 7 Schematic top view of the cofferdam in the present invention;

[0023] Figure 8 for Figure 7 Schematic diagram of the cross section along AA;

[0024] Figure 9 for Figure 7 Schematic cross-section along the middle BB;

[0025] Figure 10 for Figure 7 Schematic cross-section of the middle section along CC;

[0026] Figure 11 for Figure 7 Schematic cross-section along the middle edge DD;

[0027] Figure 12 for Figure 7 Schematic cross-section along EE;

[0028] Figure 13 It is a structural schematic diagram of the cofferdam columns in the utility model. DETAILED DESCRIPTION

[0029] The following is a further detailed description of the features of the present invention and other related features through embodiments in conjunction with the accompanying drawings to facilitate understanding by those skilled in the art:

[0030] like Figure 1-13 As shown in the figure, the marks are respectively represented as: steel casing 1, hanging beam 2, steel wire rope 3, cofferdam column 4, bored pile 5, steel sheet pile 6, ring beam 7, internal support 8, cushion layer 9, pedestal reinforcement 10, pier column embedded reinforcement fixing frame 11, pier column embedded reinforcement 12, pedestal 13, cushion layer 14, bolt 15, horizontal internal support 111, longitudinal internal support 112, support leg 41, and supporting plate 42.

[0031] Example: Figure 1-13 As shown, this embodiment relates to a pier column embedded reinforcement fixing device based on a cofferdam column, the fixing device includes a pier column embedded reinforcement fixing frame 11 arranged around the outer periphery of the pier column embedded reinforcement 12 and a plurality of fixing columns, wherein part of the pier column embedded reinforcement 12 is inserted and fixed in the gap of the base steel bar 10 located at the bottom of the cofferdam, and the part of the pier column embedded reinforcement 12 that is higher than the top of the base steel bar 10 is limited and fixed by the pier column embedded reinforcement fixing frame 11; the fixing column includes a bored pile 5 located below the base steel bar 10 and a cofferdam column 4 partially cast in the bored pile 5, the top of the cofferdam column 4 passes through the top surface of the base steel bar 10 and is fixedly connected to the pier column embedded reinforcement fixing frame 11, and the cofferdam column 4 is arranged around the outer periphery of the pier column embedded reinforcement 12.

[0032] Since the cofferdam columns 4 are rooted in the bored piles 5, they have high stability, and the pier column embedded reinforcement fixing frame 11 is fixedly connected to the cofferdam columns 4. The pier column embedded reinforcement fixing frame 11 can effectively fix the pier column embedded reinforcement 12 to avoid being disturbed during the pouring of the base 13, and the pier column can be recycled after the construction is completed, reducing construction costs.

[0033] In this embodiment, the pier column embedded reinforcement 12 can be steel bars, and several steel bars are tied together to form a whole.

[0034] In this embodiment, the cofferdam columns 4 are lattice-type steel columns. The four-corner lattice structure saves material. Furthermore, a plurality of gusset plates 42 are provided on the outer perimeter of the cofferdam columns 4 to enhance their structural strength. These gusset plates 42 are spaced apart along the length of the cofferdam columns 4. The cofferdam columns 4 are secured together using angle steels spaced apart along the length of the four corner steel columns.

[0035] In this embodiment, the pier column pre-embedded reinforcement fixing frame 11 includes horizontally arranged legs 41, which are inserted into the gaps between the cofferdam columns 4 and welded to the cofferdam columns 4. Specifically, the pier column pre-embedded reinforcement fixing frame 11 is provided with legs 41 at the bottom. Legs 41 are inserted into the cofferdam columns 4 from the sides and then welded to the cofferdam columns 4, for example, to the gusset plates 42 of the cofferdam columns 4. This connection eliminates eccentric stress on the cofferdam columns 4, resulting in a more stable structure.

[0036] In this embodiment, a steel casing 1 is provided around the bored pile 5. That is, the steel casing 1 is first inserted and then the bored pile 5 is cast inside the steel casing 1. The steel casing 1 can further enhance the strength of the bored pile 5.

[0037] In this embodiment, a ring beam 7 and a number of internal supports 8 that laterally support the ring beam 7 are provided on the inner periphery of the top of the cofferdam. Some of the internal supports 8 pass through the pier column embedded reinforcement 12 and the pier column embedded reinforcement fixing frame 11. The top support of the cofferdam column 4 fixes the bottom of the internal support 8. In other words, for the internal support 8 located directly above the cofferdam column 4, the top surface of the cofferdam column 4 is supported on the bottom of the corresponding internal support 8 to achieve connection between nodes. Optionally, it can be further fixed by welding or other methods. Therefore, since the internal support 8 is an axially loaded component and is subjected to a large force, the cofferdam column 4 and the bored pile 5 are used to offset the vertical force such as the gravity of the internal support 8, that is, to avoid bearing vertical force, thereby reducing the deflection and calculated length of the internal support 8.

[0038] In this embodiment, the pier column pre-embedded reinforcement fixing frame 11 includes several fixed segments, and adjacent fixed segments are detachably connected by bolts 15 at the intersection with the inner support 8. In other words, if the pier column pre-embedded reinforcement fixing frame 11 is a single unit, it may interfere with the inner support 8 during installation. Therefore, by configuring the pier column pre-embedded reinforcement fixing frame 11 into several fixed segments, and then detachably connecting the adjacent fixed segments by bolts 15 at the intersection with the inner support 8, the inner support 8 is avoided and installation is simplified. Optionally, the pier column pre-embedded reinforcement fixing frame 11 located on the long side of the pier column includes a rectangular vertical frame and a horizontal bracket, the rectangular vertical frame and the horizontal bracket are connected at right angles, and a plurality of diagonal reinforcing ribs are provided between the two long sides of the rectangle to strengthen the structure; the pier column pre-embedded reinforcement fixing frame 11 located on the short side of the pier column may include a trapezoidal vertical frame and a horizontal bracket, the trapezoidal vertical frame and the horizontal bracket are connected at right angles, and a plurality of diagonal reinforcing ribs are provided between the two parallel sides of the trapezoid to strengthen the structure.

[0039] In this embodiment, the inner support 8 includes a plurality of transverse inner supports 111 and a plurality of longitudinal inner supports 112. The transverse inner supports 111 are spaced apart in the transverse direction, and the longitudinal inner supports 112 are spaced apart in the longitudinal direction. The transverse inner supports 111 intersect with the longitudinal inner supports 112 and are fixedly connected to each other at the intersection. Thus, the inner supports 8 form a grid-like support structure that can effectively support the inner wall of the ring beam 7. Since the transverse inner supports 111 and the longitudinal inner supports 112 are fixed together as a whole, the cofferdam columns 4 can effectively provide vertical support for the inner supports 8.

[0040] In this embodiment, a cushion layer 9 is further provided below the cap steel bar 10. By providing the cushion layer 9, the support strength of the bottom of the cap 13 can be further improved.

[0041] In this embodiment, a plurality of steel sheet piles 6 are inserted at the boundary of the cofferdam to enclose the cofferdam. The steel sheet piles 6 can enhance the strength of the cofferdam.

[0042] The following further introduces a method for constructing the above-mentioned pier column embedded reinforcement fixing device based on the cofferdam column, that is, the pier column embedded reinforcement fixing method based on the cofferdam column.

[0043] The above method comprises the following steps:

[0044] Step S1: inserting a number of steel casings 1 at intervals in the cofferdam area to construct bored piles 5. The top surface of the bored piles 5 formed is higher than the bottom elevation of the preset cap 13. Cofferdam columns 4 are cast and fixed on the bored piles 5 located around the preset pier area. The cofferdam columns 4 partially protrude from the top surface of the bored piles 5.

[0045] In this embodiment, within the cofferdam area to be constructed, several steel casings 1 are inserted into the ground at intervals by means of ramming or the like, and bored piles 5 are constructed in each steel casing 1 .

[0046] like Figure 1 As shown, specifically, step S1 includes:

[0047] Step S11: inserting a steel casing 1 into the cofferdam area, with the top surface of the steel casing 1 protruding from the ground;

[0048] Step S12: then carry out mud wall protection and drilling;

[0049] Step S13: clean the hole and lower the steel cage;

[0050] Step S14: Install the hanging beam 2 on the top surface of the steel casing 1, and then hang the cofferdam columns 4 into the steel casing 1 through the hanging beam 2. The cofferdam columns 4 can be connected to the hanging beam 2 by steel wire ropes 3 or the like. The bottom surface of the lowered cofferdam columns 4 is 1m lower than the bottom surface elevation of the preset base 13, and the top surface of the cofferdam columns 4 is flush with the bottom surface of the preset inner support 8, so that the cofferdam columns 4 can subsequently vertically support the inner support 8.

[0051] Step S15: Secondary hole cleaning and pouring of underwater concrete for the pile foundation. The top surface of the concrete is about 1m higher than the preset bottom elevation of the pedestal 13. After the concrete solidifies, a bored pile 5 is obtained. The top surface of the bored pile 5 is about 1m higher than the preset bottom elevation of the pedestal 13. Part of the cofferdam column 4 is poured into the bored pile 5, and part of it protrudes from the top surface of the bored pile 5.

[0052] In this embodiment, the cofferdam columns 4 are arranged in a circle around the outer periphery of the pier to be constructed.

[0053] Step S2: inserting a plurality of steel sheet piles 6 at the boundary of the cofferdam area to enclose the cofferdam area, and excavating within the cofferdam area to a first preset depth.

[0054] like Figure 2 As shown, in this step, several steel sheet piles 6 are inserted at the boundary of the cofferdam area, and the steel sheet piles 6 are interconnected to enclose the cofferdam area. Then, excavation is carried out within the enclosed cofferdam area to a first predetermined depth. This first predetermined depth can be 0.5 m below the predetermined height of the inner support 8. For example, if the predetermined inner support 8 is set at the ground elevation, the first predetermined depth is 0.5 m below the ground. In this step, the excavated portion, i.e., the cofferdam area, is removed except for the areas blocked by the steel casing 1.

[0055] Step S3: Cut off the portion of the steel casing 1 that is higher than the excavation surface in the cofferdam area, set a ring beam 7 on the inner periphery of the cofferdam area, and set a plurality of inner supports 8 that laterally support the ring beam 7. The top of the cofferdam column 4 supports and fixes the bottom of the inner support 8.

[0056] This step is mainly to set the support 8 in the cofferdam area.

[0057] like Figure 3 As shown, specifically, step S3 includes the following steps:

[0058] Step 31: Remove the hanging beam 2;

[0059] Step 32: Cut off the steel casing 1 that affects the installation of the inner support 8, that is, cut off the portion of the steel casing 1 that is higher than the excavation surface in the above step S2;

[0060] Step S33: Install the ring beam 7 and the inner support 8, wherein the ring beam 7 is located at the circumferential edge of the cofferdam area and contacts the steel sheet piles 6. The height of the ring beam 7 can be approximately the ground elevation; the inner support 8 is laterally supported in the ring beam 7, and the two ends of the inner support 8 are respectively against the inner wall of the ring beam 7.

[0061] It should be noted that in this embodiment, for the inner supports 8 located directly above the cofferdam columns 4, the top surfaces of the cofferdam columns 4 are supported on the bottoms of the corresponding inner supports 8 to achieve node-to-node connection. Optionally, the connection can be further fixed by welding or other methods. Therefore, since the inner supports 8 are axially loaded components and are subject to relatively large forces, the cofferdam columns 4 and bored piles 5 offset the vertical forces such as gravity on the inner supports 8, thereby avoiding the bearing of vertical forces. This can reduce the deflection and calculated length of the inner supports 8.

[0062] Step S4: Continue excavating in the cofferdam area to the bottom of the preset cushion layer 9, remove the steel casing 1 and the bored pile 5 that are higher than the bottom elevation of the preset cap 13, and construct a layer of cushion layer 9 on the bottom of the cushion layer 9.

[0063] like Figure 4 As shown, specifically, step S4 includes the following steps:

[0064] Step S41: Continue excavating in the cofferdam area until reaching the bottom surface of the preset cushion layer 9;

[0065] Step S42: cutting off the portion of the steel casing 1 that is higher than the preset bottom elevation of the cap 13, and chiseling off the pile head, that is, chiseling off the portion of the bored pile 5 that is higher than the preset bottom elevation of the cap 13;

[0066] Step S43: construct a cushion layer 9 on the bottom surface of the cushion layer 9, and the top surface of the cushion layer 9 is just flush with the top surface of the bored pile 5 after being chiseled out. Optionally, the thickness of the cushion layer 9 can be 20 cm.

[0067] Step S5: Tie the foundation steel bars 10 on the cushion layer 9 and build the foundation 13 template, install the pier column embedded reinforcement fixing frame 11 outside the preset pier column area on the foundation steel bars 10, fix the pier column embedded reinforcement fixing frame 11 to the cofferdam column 4, and tie the pier column embedded reinforcement 12 in the preset pier column area, and fix the pier column embedded reinforcement 12 to the pier column embedded reinforcement fixing frame 11.

[0068] like Figure 5 As shown, specifically, step S5 includes the following steps:

[0069] Step S51: Tie the cap steel bars 10 on the cushion layer 9 and erect the cap 13 template;

[0070] Step S52: Installing a pier column pre-embedded reinforcement fixing frame 11 on the periphery of the preset pier column area on the cap steel bar 10, that is, setting the pier column pre-embedded reinforcement fixing frame 11 on the periphery of the area where the pier column is to be constructed, and fixing the pier column pre-embedded reinforcement fixing frame 11 to the cofferdam column 4;

[0071] Step S53: Tie the pier column embedded reinforcement bars 12. Specifically, the pier column embedded reinforcement bars 12 can be long and relatively weak. Therefore, the pier column embedded reinforcement bars 12 are secured to the pier column embedded reinforcement bar fixing frame 11. By securing the pier column embedded reinforcement bars 12 with the pier column embedded reinforcement bar fixing frame 11, disturbance of the pier column embedded reinforcement bars 12 during the pouring of the pedestal 13 can be avoided. Optionally, the pier column embedded reinforcement bars 12 can be partially inserted into the pedestal 13 region, i.e., inserted into the pedestal reinforcement bars 10.

[0072] Step S6: Casting the foundation 13. After casting is completed, the ring beam 7 and the inner support 8 are removed.

[0073] like Figure 6 As shown, specifically, step S6 includes the following steps:

[0074] Step S61: pouring concrete for the cap 13. After the concrete solidifies, the cap 13 is formed. At this time, the pier column embedded reinforcement 12 is partially poured into the cap 13 and fixed as the concrete solidifies.

[0075] Step S62: After pouring is completed, the ring beam 7 and the inner support 8 are removed.

[0076] In this embodiment, after the step of pouring concrete for the cap 13 and removing the ring beam 7 and the inner support 8 after the pouring is completed, the method further includes:

[0077] The pier column is constructed, and after the construction is completed, the pier column embedded reinforcement fixing frame 11 and the portion of the cofferdam column 4 that is higher than the top surface of the bearing platform 13 are recovered.

[0078] That is to say, after the above step S62, the pier column construction continues. After the pier column construction is completed, the pier column embedded reinforcement fixing frame 11 and the part of the cofferdam column 4 that is higher than the top surface of the base 13 are recovered for subsequent reuse to reduce construction costs.

[0079] In this embodiment, the pier column embedded reinforcement fixing frame 11 includes a support leg 41, and the step of fixing the pier column embedded reinforcement fixing frame 11 to the cofferdam column 4 includes:

[0080] The legs 41 of the pier column embedded reinforcement fixing frame 11 are inserted into the gaps of the cofferdam columns 4 and fixed by welding.

[0081] In summary, the beneficial effects of the present invention are as follows: the cofferdam columns are rooted in the bored piles, have high stability, can form effective vertical support for the internal supports, and prevent the internal supports from bearing vertical forces; the pier column embedded reinforcement fixing frame can effectively fix the pier column embedded reinforcement to avoid being disturbed during the foundation casting process; and the pier column can be recycled after the construction is completed, thereby reducing construction costs.

[0082] Unless otherwise defined, the technical or scientific terms used herein shall have the usual meaning understood by persons of ordinary skill in the field to which the present invention belongs. The words "first", "second" and similar terms used in the specification and claims of the present utility model patent application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "a" do not indicate a quantity limitation, but rather indicate the existence of at least one. Words such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship also changes accordingly.

[0083] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles described in the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A pier column embedded reinforcement fixing device based on cofferdam columns, characterized in that: The fixing device includes a pier column embedded reinforcement fixing frame and a plurality of fixing columns arranged around the outer periphery of the pier column embedded reinforcement, part of the pier column embedded reinforcement is inserted and fixed in the gap of the base steel bar at the bottom of the cofferdam, and the part of the pier column embedded reinforcement that is higher than the top of the base steel bar is limited and fixed by the pier column embedded reinforcement fixing frame, the fixing column includes a bored pile located below the base steel bar and a cofferdam column partially cast in the bored pile, the top of the cofferdam column passes through the top surface of the base steel bar and is fixedly connected to the pier column embedded reinforcement fixing frame, and the cofferdam column is arranged around the outer periphery of the pier column embedded reinforcement.

2. The fixing device according to claim 1, characterized in that The cofferdam columns are lattice steel columns.

3. The fixing device according to claim 1, characterized in that The pier column embedded reinforcement fixing frame includes horizontally arranged supporting legs, which are inserted into the gaps between the cofferdam columns and are welded and fixed to the cofferdam columns.

4. The fixing device according to claim 1, characterized in that A steel casing is provided on the periphery of the bored pile.

5. The fixing device according to claim 1, characterized in that A ring beam and several inner supports for laterally supporting the ring beam are provided on the inner periphery of the top of the cofferdam. Some of the inner supports pass through the pier column embedded reinforcement and the pier column embedded reinforcement fixing frame. The top support of the cofferdam column fixes the bottom of the inner support.

6. The fixing device according to claim 5, characterized in that The pier column embedded reinforcement fixing frame includes a plurality of fixing sections, and adjacent fixing sections are detachably connected by bolts at positions where they intersect with the inner supports.

7. The fixing device according to claim 5, characterized in that The inner supports include a plurality of transverse inner supports and a plurality of longitudinal inner supports. The plurality of transverse inner supports are arranged at intervals in the transverse direction, and the plurality of longitudinal inner supports are arranged at intervals in the longitudinal direction. The plurality of transverse inner supports intersect with the plurality of longitudinal inner supports and are fixedly connected to each other at the intersection.

8. The fixing device according to claim 1, wherein: A cushion layer is also provided below the foundation steel bars.

9. The fixing device according to claim 1, characterized in that A plurality of steel sheet piles are inserted at the boundary of the cofferdam to enclose the cofferdam.

10. The fixing device according to claim 2, characterized in that A plurality of gusset plates are welded to the outer peripheral surface of the cofferdam column, and the plurality of gusset plates are arranged at intervals in the longitudinal direction of the cofferdam column.

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