Steel sheet pile and steel formwork double-enclosure structure in offshore shallow water area

Abstract

The utility model discloses an offshore shallow water area steel sheet pile and steel formwork double-enclosure structure which is arranged on the periphery of a bearing platform and comprises an outer-layer enclosure structure, an inner-layer enclosure structure and a bottom sealing concrete structure, the outer-layer enclosure structure is a steel sheet pile, and the inner-layer enclosure structure is a steel formwork; the bottom sealing concrete structure comprises a first bottom sealing concrete layer and a second bottom sealing concrete layer; the first bottom sealing concrete layer is connected with the outer-layer enclosure structure to form sealing, and the second bottom sealing concrete layer is connected with the inner-layer enclosure structure to form sealing. The water blocking device can play a water blocking role, and can form an internal dry working environment in cooperation with a water suction pump.

Description

Technical Field

[0001] The utility model relates to the technical field of offshore bridges, and more specifically, to a double enclosure structure of steel sheet piles and steel formwork in offshore shallow water areas. Background Art

[0002] Most offshore bridges are equipped with navigation holes to meet the requirements of maritime navigation. Navigation hole bridges are mainly large-span cable-stayed bridges or suspension bridges. Regardless of the type of bridge, the substructure adopts a large-size pedestal + pile group foundation. The construction of offshore pedestals is most affected by tides. The ebb and flow of tides subject the pedestal retaining structure to repeated lateral pressure, which makes it very difficult to prevent water leakage in the pedestal retaining structure. At present, most large-size offshore pedestals use double-walled steel casings as their retaining structures and templates, which have very good rigidity and water-stopping effects, but the construction requires the use of large-scale water equipment, which is time-consuming, labor-intensive and uneconomical. Utility Model Content

[0003] The utility model aims to provide a double enclosure structure of steel sheet piles and steel formwork in offshore shallow water areas, which can play a water-blocking role and form an internal dry working environment in conjunction with a water pump.

[0004] The technical solution adopted by the utility model to solve this technical problem is: a double enclosure structure of steel sheet piles and steel formwork in offshore shallow water areas, which is arranged on the outer periphery of the pedestal and includes an outer enclosure structure and an inner enclosure structure, wherein the outer enclosure structure is steel sheet piles, and the inner enclosure structure is steel formwork.

[0005] As a further solution of the utility model: it also includes a bottom sealing concrete structure, which includes a first bottom sealing concrete layer and a second bottom sealing concrete layer; the first bottom sealing concrete layer is connected to the outer layer of the enclosure structure to form a closure, and the second bottom sealing concrete layer is connected to the inner layer of the enclosure structure to form a closure.

[0006] As a further solution of the utility model, it also includes a steel sheet pile guide frame, which is installed on the pile foundation steel casing, the steel sheet pile guide frame includes a cross brace, a diagonal brace and a guide beam, the cross brace is horizontally welded to the side wall of the steel casing, the diagonal brace obliquely connects the steel casing and the cross brace, and the cross brace is fixed with a guide beam above one end of the steel sheet pile.

[0007] As a further solution of the utility model, a backfill layer is provided at the bottom layer of the bottom sealing concrete structure.

[0008] As a further solution of the utility model, the outer enclosure structure is arranged to expand outwards along the edge line of the foundation by a certain distance.

[0009] As a further solution of the utility model, surrounding purlins and inner supports are arranged between the steel sheet piles.

[0010] The utility model at least has the following beneficial effects:

[0011] First, as the outer retaining structure, the steel sheet piles bear the external water pressure and play a water-blocking role. Together with the water pump, they can form an internal dry working environment.

[0012] Second, the steel formwork is used as the inner retaining structure, mainly as the formwork for the pouring of the pedestal concrete, and also has a water-blocking effect, which can prevent water from leaking in from the steel sheet piles.

[0013] Third, the double enclosure structure of steel sheet piles and steel formworks, the bottom concrete is poured in two layers, the first bottom concrete layer is sealed with the steel sheet piles, the second bottom concrete layer is sealed with the steel formworks, the gap between the steel formworks and the steel sheet piles naturally forms a water collection trough, which has a good water-blocking effect.

[0014] Fourth, the double enclosure structure of steel sheet piles and steel formwork can effectively reduce the water blocking workload of a single steel sheet pile cofferdam. At the same time, compared with the double-wall steel cofferdam, it has the advantages of convenient construction, high efficiency and low cost.

[0015] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of a double enclosure structure of steel sheet piles and steel formwork in offshore shallow waters according to an embodiment of the utility model;

[0017] Figure 2 It is a top view of a double enclosure structure of steel sheet piles and steel formwork in shallow water areas at sea according to an embodiment of the utility model;

[0018] Figure 3 It is a schematic diagram of a steel sheet pile guide frame according to an embodiment of the utility model.

[0019] Among them, 1-steel sheet piles, 2-steel formwork, 3-first bottom sealing concrete layer, 4-second bottom sealing concrete layer, 5-backfill layer, 6-internal support, 7-steel sheet pile guide frame, 8-cross brace, 9-diagonal brace, 10-guide beam, 11-steel casing, 12-pedestal edge line, 13-purlin. DETAILED DESCRIPTION

[0020] The utility model is described in detail and completely below in conjunction with the accompanying drawings. A person of ordinary skill in the art will be able to implement the utility model based on these descriptions. Before describing the utility model in conjunction with the accompanying drawings, it should be particularly pointed out that the technical solutions and technical features provided in each part of the utility model, including the following description, can be combined with each other without conflict.

[0021] In addition, the embodiments of the present invention involved in the following description are generally only a part of the embodiments of the present invention, rather than all of the embodiments. Therefore, based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0022] The following is a further detailed description of the utility model in conjunction with the accompanying drawings and implementations, and its specific implementation process is as follows:

[0023] like Figures 1 to 3 As shown, the utility model provides a double enclosure structure of steel sheet piles and steel formwork 2 in shallow water areas at sea, which is arranged on the outer periphery of the pedestal and includes an outer enclosure structure and an inner enclosure structure, wherein the outer enclosure structure is steel sheet piles and the inner enclosure structure is steel formwork 2.

[0024] In this embodiment, the outer enclosure structure bears the external water pressure and plays a water-blocking role, and cooperates with the water pump to form an internal dry working environment. The inner enclosure structure is mainly used as a template for the pouring of the cap concrete, and also has a water-blocking effect to prevent water from leaking from the steel sheet piles.

[0025] This technical solution may also include the following technical details to better achieve the technical effect: it also includes a bottom sealing concrete structure, which includes a first bottom sealing concrete layer 3 and a second bottom sealing concrete layer 4; the first bottom sealing concrete layer 3 is connected to the outer layer enclosure structure to form a closure, and the second bottom sealing concrete layer 4 is connected to the inner layer enclosure structure to form a closure, so that a water collecting trough is formed between the inner layer enclosure structure and the outer layer enclosure structure, which has an excellent water blocking effect. In this embodiment, the double enclosure structure of steel sheet piles and steel formwork 2 can effectively reduce the water blocking workload of a single steel sheet pile cofferdam, and at the same time, compared with a double-walled steel cofferdam, it has the advantages of convenient construction, high efficiency, and low cost. In this embodiment, the main pier cap adopts a steel sheet pile + steel formwork 2 combined enclosure structure, the cap bottom thickness is 2.5m, the bottom elevation of the cap is -4m, the seabed elevation is -6m, and the cap is poured in two times. The first layer of the cap concrete layer 3 is poured for 1.9m, and the second layer of the cap concrete layer 4 is poured for 0.6m. The backfill layer 5 is completed before the bottom is poured. The backfill layer 5 can be backfilled with slag or sea sand.

[0026] The construction of offshore piers is affected by tides, and the retaining structure needs to have sufficient rigidity and water-blocking capacity. Steel sheet piles, as a main type of retaining structure, have sufficient rigidity and strength, but the water-blocking effect is poor in seawater, especially when the tidal range is relatively large. For large-sized piers, the water-blocking effect is even more unsatisfactory due to the increase in the joints of the steel sheet piles. Therefore, the double retaining structure, based on the steel sheet pile cofferdam, strengthens the water-blocking capacity of the pier formwork, and forms closed water-blocking structures with steel sheet piles and steel formwork 2 through two bottom sealings, which can effectively achieve the water-blocking effect of the pier retaining structure. At the same time, the steel sheet piles can provide sufficient rigidity and strength for the retaining structure, and the steel formwork 2 can provide the retaining structure with a template function for concrete pouring, achieving multiple effects at one stroke.

[0027] The present technical scheme may also include the following technical details to better achieve the technical effect: it also includes a steel sheet pile guide frame 7, which is installed on the steel casing 11, and the steel sheet pile guide frame 7 includes a cross brace 8, a diagonal brace 9 and a guide beam 10. The cross brace 8 is horizontally welded to the side wall of the steel casing 11, and the diagonal brace 9 obliquely connects the steel casing 111 and the cross brace 8. The cross brace 8 is fixed with a guide beam 10 above one end of the steel sheet pile. The steel sheet pile guide frame 7 serves as a guide frame for the construction of inserting and driving steel sheet piles to ensure the accuracy of the insertion position of the steel pipe piles.

[0028] The technical solution may also include the following technical details to better achieve the technical effect: the bottom layer of the bottom sealing concrete structure is provided with a backfill layer 5, and the backfill layer 5 may be backfilled with slag or sea sand.

[0029] The present technical solution may also include the following technical details to better achieve the technical effect: the outer retaining structure is set along the edge line 12 of the pedestal for a certain distance. In the present embodiment, the steel sheet piles are Larsen type IV (SP-IV) steel sheet piles. The steel sheet piles are driven 1.5m outward along the edge line 12 of the pedestal to provide the space requirements for the installation of the inner retaining structure.

[0030] The technical solution may also include the following technical details to better achieve the technical effect: surrounding purlins 13 and inner supports 6 are arranged between the steel sheet piles.

[0031] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and implementation scheme. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the embodiments shown and described herein.

Claims

1. A double enclosure structure of steel sheet piles and steel formwork in offshore shallow water areas, which is arranged on the periphery of the cap, characterized in that: It includes an outer layer enclosure structure and an inner layer enclosure structure, wherein the outer layer enclosure structure is a steel sheet pile, and the inner layer enclosure structure is a steel formwork; It also includes a bottom sealing concrete structure, which includes a first bottom sealing concrete layer and a second bottom sealing concrete layer; the first bottom sealing concrete layer is connected to the outer layer enclosure structure to form a seal, and the second bottom sealing concrete layer is connected to the inner layer enclosure structure to form a seal; A steel sheet pile guide frame is installed on a pile foundation steel casing, and comprises a transverse brace, an oblique brace and a guide beam. The transverse brace is horizontally welded to a side wall of the steel casing, the oblique brace obliquely connects the steel casing and the transverse brace, and a guide beam is fixed to the top of the transverse brace toward one end of the steel sheet pile.

2. The offshore shallow water area steel sheet pile and steel formwork double enclosure structure as claimed in claim 1, characterized in that: The bottom layer of the bottom sealing concrete structure is provided with a backfill layer.

3. The offshore shallow water area steel sheet pile and steel formwork double enclosure structure as claimed in claim 1, characterized in that: The outer enclosure structure is arranged along the edge line of the foundation for a certain distance.

4. The offshore shallow water area steel sheet pile and steel formwork double enclosure structure as claimed in claim 1, characterized in that: Surrounding purlins and inner supports are arranged between the steel sheet piles.

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