A construction method and structure of a combined cofferdam of double-wall steel cofferdam and Larsen steel sheet pile

Abstract

The present invention provides a construction method and structure of a combined cofferdam of double-walled steel cofferdam and Larsen steel sheet piles, and the steps of the construction method include: assembling the double-walled steel cofferdam, and inspecting and accepting; installing a limiting device, installing the limiting device on the top of the double-walled steel cofferdam, and the limiting device includes an outer limiting piece, an inner limiting piece, and a side connecting plate; inserting Larsen steel sheet piles, and installing Larsen steel sheet piles one by one in the limiting device by using a crane and a clamp; inspecting the tightness of the Larsen steel sheet piles; and lowering the combined steel cofferdam after passing the acceptance. The present invention can realize the installation of Larsen steel sheet piles on the double-walled steel cofferdam by installing the limiting device on the double-walled steel cofferdam to form an overall cofferdam system, which can fully utilize the double-walled steel cofferdam to resist the water pressure in the deep water area, and can also utilize the Larsen steel sheet piles to resist the water pressure in the shallow water area, and at the same time, the double-walled steel cofferdam in the shallow water area is converted into Larsen steel sheet piles, which can reduce the processing time and cost of the double-walled steel cofferdam, save costs, and improve construction efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of steel cofferdam construction, and in particular relates to a construction method and structure of a cofferdam combined with a double-wall steel cofferdam and Larsen steel sheet piles. Background Art

[0002] Conventional steel cofferdams are divided into double-walled steel cofferdams and single-walled steel cofferdams. Single-walled steel cofferdams are further divided into Larsen steel sheet piles and steel processing. Double-walled steel cofferdams are suitable for deep-water construction, while single-walled steel cofferdams are suitable for shallow-water construction. At present, there are construction cases in which a single-walled steel cofferdam with steel processing is set on a double-walled steel cofferdam to form a combined cofferdam. The processing is relatively complicated and the construction efficiency is low. The double-walled steel cofferdam can effectively resist deep-water pressure and concrete pressure, but the processing cost of the double-walled steel cofferdam is high and the construction efficiency is low. Larsen steel sheet piles are finished products and purchased products in the industry, with high construction efficiency and good sealing effect, but there is no combined cofferdam with Larsen steel sheet piles set on a double-walled steel cofferdam. Summary of the invention

[0003] In order to solve the problems existing in the background technology, the present invention provides a double-wall steel cofferdam and Larsen steel sheet pile combined cofferdam construction method and structure, which combines the double-wall steel cofferdam with the Larsen steel sheet pile, fully utilizes the advantages of the two cofferdams, improves construction efficiency, and saves construction costs.

[0004] On the one hand, the present invention provides a method for constructing a cofferdam composed of double-walled steel cofferdam and Larsen steel sheet pile, the steps of which include:

[0005] S1: The double-wall steel cofferdam is assembled and inspected and accepted;

[0006] S2: Installation of the limit device: Install the limit device on the top of the double-wall steel cofferdam. The limit device includes an outer limit piece, an inner limit piece, and a side connecting plate.

[0007] S3: Insert the Larsen steel sheet piles and install the Larsen steel sheet piles one by one in the limit device using a crane and a clamp;

[0008] S4: Check the tightness of the limit device and process the gap between the limit device and the Larsen steel sheet pile to prevent the Larsen steel sheet pile from shaking;

[0009] S5: After acceptance, evenly lower the combined steel cofferdam.

[0010] Furthermore, when installing the limit device in the above step S2, first weld a bottom connecting plate with the same width as the double-walled steel cofferdam above the double-walled steel cofferdam, and mark the bottom connecting plate, and weld the outer limit piece and the inner limit piece on both sides of the bottom connecting plate according to the marked lines. The spacing between the outer limit piece and the inner limit piece is the thickness of the Larsen steel sheet pile after assembly, and then set the side connecting plates at both ends of the outer limit piece and the inner limit piece to connect the outer limit piece and the inner limit piece into a whole.

[0011] Furthermore, in the above step S3, the Larsen steel sheet piles are temporarily fixed first, and the Larsen steel sheet piles are first installed on the four corners of the double-wall steel cofferdam. The Larsen steel sheet piles at the four corners should be welded to each other to improve the airtightness; then the other Larsen steel sheet piles are clamped by a crane and a clamp, and the Larsen steel sheet piles are inserted one by one based on the Larsen steel sheet piles fixed on the upstream cofferdam corner, and closed at the downstream cofferdam corner.

[0012] Furthermore, the specific process of processing the gap between the inside of the limiting device and the Larsen steel sheet pile in the above step S4 is to fill the gap at the connection between the Larsen steel sheet pile and the limiting device with a steel plate or a wedge block to prevent the Larsen steel sheet pile from shaking.

[0013] Furthermore, the specific process of the above step S5 is to use a winch or a jack to slowly, evenly and evenly lower the combined cofferdam.

[0014] On the other hand, the present invention provides a combined cofferdam structure of a double-wall steel cofferdam and Larsen steel sheet piles, including a double-wall steel cofferdam placed at the bottom, a Larsen steel sheet pile placed at the top, and a limiting device arranged between the double-wall steel cofferdam and the Larsen steel sheet piles, the limiting device including an outer limiting member and an inner limiting member respectively arranged on the outside and the inside, and a side connecting plate arranged between the two ends of the outer limiting member and the inner limiting member, and the spacing formed between the outer limiting member and the inner limiting member is consistent with the thickness of the Larsen steel sheet pile.

[0015] Furthermore, a bottom connecting plate is welded to the top of the double-walled steel cofferdam, the outer limiting piece is welded to the outer side above the bottom connecting plate, and the inner limiting piece is welded to the inner side above the bottom connecting plate.

[0016] Furthermore, the outer limiting member and the inner limiting member are respectively arranged in layers of welding connection along the height direction.

[0017] Furthermore, the outer limiting member, the inner limiting member and the side connecting plate are connected by welding.

[0018] Furthermore, the width of the bottom connecting plate is consistent with that of the double-walled steel cofferdam.

[0019] The beneficial effect of the present invention is that the present invention can realize the installation of Larsen steel sheet piles on the double-walled steel cofferdam by installing a limiting device on the double-walled steel cofferdam to form an overall cofferdam system, which can fully utilize the double-walled steel cofferdam to resist the water pressure in the deep water area, and can also utilize the Larsen steel sheet piles to resist the water pressure in the shallow water area, and at the same time, the double-walled steel cofferdam in the shallow water area is converted into Larsen steel sheet piles, which can not only reduce the processing time and cost of the double-walled steel cofferdam, but also save costs and improve construction efficiency.

[0020] BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 It is a schematic flow chart of a construction method of a double-wall steel cofferdam and Larsen steel sheet pile combined cofferdam of the present invention;

[0021] Figure 2 It is a top view schematic diagram of a cofferdam structure composed of double-wall steel cofferdam and Larsen steel sheet piles according to the present invention;

[0022] Figure 3 It is a side schematic diagram of a cofferdam structure composed of double-wall steel cofferdam and Larsen steel sheet piles according to the present invention;

[0023] Figure 4 It is a schematic elevation view of a cofferdam structure composed of double-wall steel cofferdam and Larsen steel sheet piles according to the present invention;

[0024] Among them: 1. Outer limiter, 2. Inner limiter, 3. Larsen steel sheet pile, 4. Double-wall steel cofferdam, 5. Side connecting plate, 6. Bottom connecting plate. DETAILED DESCRIPTION

[0025] The present invention is described clearly and completely below in conjunction with the accompanying drawings so that those skilled in the art can fully implement the present invention without having to make any creative work.

[0026] like Figure 1-4 As shown, the present invention provides a method for constructing a cofferdam composed of double-wall steel cofferdam and Larsen steel sheet pile, the steps of which include:

[0027] S1: The double-wall steel cofferdam 4 is assembled and inspected and accepted;

[0028] S2: Installation of a limiting device: A limiting device is installed on the top of the double-walled steel cofferdam 4, wherein the limiting device comprises an outer limiting member 1, an inner limiting member 2, and a side connecting plate 5;

[0029] S3: inserting the Larsen steel sheet pile 3, and installing the Larsen steel sheet pile 3 one by one in the limiting device by using a crane and a clamp;

[0030] S4: Check the tightness of the limit device and process the gap between the inside of the limit device and the Larsen steel sheet pile 3 to prevent the Larsen steel sheet pile 3 from shaking;

[0031] S5: After acceptance, evenly lower the combined steel cofferdam.

[0032] Furthermore, when installing the limiting device in the above step S2, first weld a bottom connecting plate 6 of the same width as the double-walled steel cofferdam 4 above the double-walled steel cofferdam 4, and mark out and draw lines on the bottom connecting plate 6, and weld an outer limiting member 1 and an inner limiting member 2 on both sides of the bottom connecting plate 6 according to the marked lines. The spacing between the outer limiting member 1 and the inner limiting member 2 is the thickness of the Larsen steel sheet pile 3 after assembly, and then set the side connecting plates 5 at both ends of the outer limiting member 1 and the inner limiting member 2, and connect the outer limiting member 1 and the inner limiting member 2 into a whole.

[0033] Furthermore, in the above step S3, the Larsen steel sheet piles 3 are temporarily fixed first, and the Larsen steel sheet piles 3 are installed at the four corners of the double-walled steel cofferdam 4. The Larsen steel sheet piles 3 at the four corners should be welded to each other to improve the airtightness; then the other Larsen steel sheet piles 3 are clamped by a crane and a clamp, and the Larsen steel sheet piles 3 are inserted one by one based on the Larsen steel sheet piles 3 fixed at the upstream cofferdam corner, and closed at the downstream cofferdam corner. Furthermore, in the above step S4, the specific process of processing the gap between the inside of the limit device and the Larsen steel sheet pile 3 is to fill the gap at the connection between the Larsen steel sheet pile 3 and the limit device with a steel plate or a wedge to prevent the Larsen steel sheet pile 3 from shaking.

[0034] Furthermore, the specific process of the above step S5 is to use a winch or a jack to slowly, evenly and evenly lower the combined cofferdam.

[0035] A combined cofferdam structure of a double-walled steel cofferdam and Larsen steel sheet piles comprises a double-walled steel cofferdam 4 arranged at the bottom, a Larsen steel sheet pile 3 arranged at the top, and a limiting device arranged between the double-walled steel cofferdam 4 and the Larsen steel sheet pile 3, wherein the limiting device comprises an outer limiting member 1 and an inner limiting member 2 respectively arranged at the outside and the inside, and a side connecting plate 5 arranged between the ends of the outer limiting member 1 and the inner limiting member 2, wherein the spacing formed between the outer limiting member 1 and the inner limiting member 2 is consistent with the thickness of the Larsen steel sheet pile 3, and the Larsen steel sheet pile 3 is fixed inside and closely pressed against each other to form a stable system to play the role of a cofferdam.

[0036] A bottom connecting plate 6 is also welded to the top of the double-walled steel cofferdam 4 as the basis of the limiting device. The outer limiting member 1 is welded on the outer side above the bottom connecting plate 6, and the inner limiting member 2 is welded on the inner side above the bottom connecting plate 6.

[0037] The outer limiting member 1 and the inner limiting member 2 are respectively arranged in multiple layers by welding in the height direction. The outer limiting member 1 and the inner limiting member 2 are both made of I-beams and are horizontally welded to form a whole.

[0038] The outer limiting member 1, the inner limiting member 2 and the side connecting plate 5 are connected by welding to form a stable system.

[0039] The width of the bottom connecting plate 6 is consistent with that of the double-walled steel cofferdam 4 .

[0040] During the construction process, the present invention first welds the bottom connecting plate 6 and the double-walled steel cofferdam 4 to form a whole, and then welds the inner and outer I-beams on the bottom connecting plate 6, and inserts the Larsen steel sheet piles 3 inside the inner and outer I-beams, and lowers the cofferdam system as a whole to the designed position to provide a construction working surface, which can not only meet the requirements of cofferdam construction in deep water areas, but also reduce the use of steel through Larsen steel sheet piles in shallow water areas, thereby saving costs.

[0041] The preferred embodiments of the present invention are described above. It should be pointed out that the present invention is not limited to the above-mentioned specific embodiments, and the devices and structures not described in detail should be understood to be implemented in a common manner in the art; any simple modifications, equivalent changes and modifications made to the above embodiments by any technician familiar with the art based on the technical essence of the present invention without departing from the scope of the technical solution of the present invention, shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A method for constructing a double-wall steel cofferdam and a Larsen steel sheet pile combined cofferdam, characterized in that: The steps include: S1: The double-wall steel cofferdam is assembled and inspected and accepted; S2: Installation of the limit device: Install the limit device on the top of the double-wall steel cofferdam. The limit device includes an outer limit piece, an inner limit piece, and a side connecting plate. S3: Insert the Larsen steel sheet piles and install the Larsen steel sheet piles one by one in the limit device using a crane and a clamp; S4: Check the tightness of the limit device and process the gap between the limit device and the Larsen steel sheet pile to prevent the Larsen steel sheet pile from shaking; S5: After acceptance, evenly lower the combined steel cofferdam; When installing the limit device in the above step S2, first weld a bottom connecting plate of the same width as the double-walled steel cofferdam above the double-walled steel cofferdam, and lay out and mark the bottom connecting plate, and weld the outer limit pieces and the inner limit pieces on both sides of the bottom connecting plate according to the markings. The spacing between the outer limit pieces and the inner limit pieces is the thickness of the Larsen steel sheet piles after assembly, and then set the side connecting plates at both ends of the outer limit pieces and the inner limit pieces, and connect the outer limit pieces and the inner limit pieces into a whole; in the above step S3, temporarily fix the Larsen steel sheet piles, and install the Larsen steel plates on the four corners of the double-walled steel cofferdam first. The Larsen steel sheet piles at the four corners should be welded to each other to improve the airtightness; then use the crane and clamp to clamp other Larsen steel sheet piles, and insert the Larsen steel sheet piles one by one based on the Larsen steel sheet piles fixed at the upstream cofferdam corner, and close them at the downstream cofferdam corner; the specific process of processing the gap between the inside of the limit device and the Larsen steel sheet pile in the above step S4 is to fill the gap at the connection between the Larsen steel sheet pile and the limit device with a steel plate or a wedge to prevent the Larsen steel sheet pile from shaking; the specific process of the above step S5 is to use a winch or a jack to slowly, evenly and balancedly lower the combined cofferdam.

2. A double-wall steel cofferdam and Larsen steel sheet pile combined cofferdam structure using the construction method of claim 1, characterized in that: It includes a double-walled steel cofferdam placed at the bottom, a Larsen steel sheet pile placed at the top, and a limiting device arranged between the double-walled steel cofferdam and the Larsen steel sheet piles, the limiting device includes an outer limiting piece and an inner limiting piece respectively arranged on the outside and the inside, and a side connecting plate arranged between the two ends of the outer limiting piece and the inner limiting piece, and the spacing formed between the outer limiting piece and the inner limiting piece is consistent with the thickness of the Larsen steel sheet pile.

3. The double-wall steel cofferdam and Larsen steel sheet pile combined cofferdam structure according to claim 2 is characterized in that: A bottom connecting plate is also welded to the top of the double-walled steel cofferdam, the outer limiting piece is welded on the outer side above the bottom connecting plate, and the inner limiting piece is welded on the inner side above the bottom connecting plate.

4. The double-wall steel cofferdam and Larsen steel sheet pile combined cofferdam structure according to claim 3 is characterized in that: The outer limiting member and the inner limiting member are respectively arranged in layers of welding connection along the height direction.

5. The double-wall steel cofferdam and Larsen steel sheet pile combined cofferdam structure according to claim 4 is characterized in that: The outer limiting member, the inner limiting member and the side connecting plate are connected by welding.

6. The double-wall steel cofferdam and Larsen steel sheet pile combined cofferdam structure according to claim 5 is characterized in that: The width of the bottom connecting plate is consistent with that of the double-walled steel cofferdam.

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