Composite steel sheet pile cofferdam structure

Abstract

The utility model relates to a composite steel sheet pile cofferdam structure which is arranged under the semi-land and semi-water condition and comprises an open water retaining layer and a closed supporting layer. The open water retaining layer is formed by continuously connecting a steel pipe pile component and a first steel plate pile component connected to the steel pipe pile component in a locked mode, the steel pipe pile component is used for supporting the first steel plate pile component, and the first steel plate pile component is used for retaining water between the preset base of the cofferdam and the preset highest water level. The opening of the open water retaining layer faces the embankment and is closed by the embankment, so that the open water retaining layer and the embankment are matched to form a closed water retaining layer; the closed supporting layer is a closed second steel sheet pile component and is used for maintaining the stability of the foundation pit between the height of a preset base of the cofferdam and the height of a preset bottom embedding position; the top end of the closed supporting layer is higher than the preset base and lower than the preset highest water level, and the closed supporting layer is located on the inner side of the open water retaining layer, so that an interlayer is formed between the closed supporting layer and the open water retaining layer and filled with backfill soil.

Description

Technical Field

[0001] The present application relates to the technical field of bridge construction, and in particular to a composite steel sheet pile cofferdam structure that provides a waterless working environment for bridge pedestal construction at the junction of a bank and a riverbed. Background Art

[0002] With the development of transportation, cross-river bridges are becoming more and more common. In bridge construction, when the bridge piers are located under the water surface, a cofferdam is required to form a waterless working environment at the construction site. The cofferdam is a temporary retaining structure used to prevent water and soil from entering the construction site so that drainage can be carried out in the cofferdam, foundation pits can be excavated, and foundations can be built.

[0003] Bridge caps are sometimes set at the junction of the embankment and the riverbed. The cap foundation pit faces a semi-land and semi-water engineering condition. The cap cofferdam set here must simultaneously bear the role of retaining water and maintaining the stability of the foundation pit. The most commonly used form of cofferdam is the steel sheet pile cofferdam. The top of the steel sheet pile should be higher than the highest water level that may occur during construction to meet the water retaining requirements. At the same time, the bottom of the steel sheet pile must have sufficient embedding depth to meet the stability requirements of the base against uplift. Therefore, under this semi-land and semi-water condition, the steel sheet pile will be too long. Too long steel sheet piles need to be welded on site, which is difficult to guide and transport. In addition, it will cause problems such as difficult positioning and easy deviation when the steel sheet piles are driven. Utility Model Content

[0004] Based on this, the present application provides a composite steel sheet pile cofferdam structure, which can effectively shorten the length of the steel sheet piles while ensuring the cofferdam performance under semi-land and semi-water conditions.

[0005] To achieve the above purpose, the technical solution adopted in this application is as follows:

[0006] A composite steel sheet pile cofferdam structure is arranged under semi-land and semi-water conditions and is used to cooperate with a embankment to form a cofferdam. The composite steel sheet pile cofferdam structure comprises an open water retaining layer and a closed supporting layer; the open water retaining layer is composed of a steel pipe pile component and a first steel sheet pile component locked to the steel pipe pile component, which are continuously connected, the steel pipe pile component is used to support the first steel sheet pile component, the first steel sheet pile component is used to retain water between a preset base of the cofferdam and a preset maximum water level, the opening of the open water retaining layer faces the embankment and is closed by the embankment, so that the open water retaining layer cooperates with the embankment to form a closed water retaining layer; the closed supporting layer is a closed second steel sheet pile component, which is used to stabilize a foundation pit between a preset base of the cofferdam and a preset bottom embedding position; the top of the closed supporting layer is higher than the preset base and lower than the preset maximum water level, and the closed supporting layer is located on the inner side of the open water retaining layer, so that an interlayer is formed between the closed supporting layer and the open water retaining layer, and the interlayer is filled with backfill soil.

[0007] Furthermore, the height of the first steel sheet pile component is H1, the height of the second steel sheet pile component is H2, the height from the preset base of the cofferdam to the preset maximum water level is h1, and the height of the second steel sheet pile component above the preset base of the cofferdam is h2, then: H1<H2, h1

[0008] Furthermore, the first steel sheet pile component is formed by a plurality of first steel sheet piles with a height of H1 being sequentially locked and connected, and the second steel sheet pile component is formed by a plurality of second steel sheet piles with a height of H2 being sequentially locked and connected end to end.

[0009] Furthermore, the first steel sheet piles and the second steel sheet piles are both U-shaped steel sheet piles and Z-shaped steel sheet piles.

[0010] Furthermore, both sides of the first steel sheet pile and both sides of the second steel sheet pile are provided with locking strips, and the two adjacent first steel sheet piles on the first steel sheet pile component and the two adjacent second steel sheet piles on the second steel sheet pile component are locked by the mutual engagement of the two locking strips.

[0011] Furthermore, the steel pipe pile component has a side buckle bar, and the first steel sheet pile is locked to the steel pipe pile component by the engagement of the locking bar with the side buckle bar.

[0012] Furthermore, a surrounding purlin is provided on the inner side of the closed supporting layer.

[0013] Furthermore, the backfill soil includes plain fill soil and sandbags.

[0014] The composite steel sheet pile cofferdam structure of the present application is designed for the cofferdam project of the bridge pedestal on half land and half water, and the functions of the cofferdam structure are decomposed. The open water retaining layer is formed by the cooperation of the first steel sheet pile component and the embankment to form a closed water retaining layer, which bears the water blocking function of the cofferdam, and the first steel sheet pile component is supported by the steel pipe pile component without the need for internal support; the closed support layer is stabilized by the second steel sheet pile component embedded in the base, and the top elevation of the steel sheet pile is lower than the preset maximum water level; the backfill soil is used to enhance the integrity of the open water retaining layer and the closed support layer to maintain the structural stability of the cofferdam; thereby, the cofferdam performance under half land and half water conditions can be guaranteed, and through such a structural decomposition design, the overall height of the cofferdam is achieved by the joint of the first steel sheet pile component and the second steel sheet pile component, thereby avoiding the excessive length of the steel sheet piles required and a series of problems caused by them. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] ​In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of the cross-sectional structure of an embodiment of the present application;

[0017] Figure 2 A schematic diagram of a top view of the structure of an embodiment of the present application;

[0018] Figure 3 It is an isometric structural schematic diagram of an embodiment of the present application;

[0019] Figure 4 This is a schematic diagram of the locking structure of the first steel sheet pile component and the steel pipe pile component in an embodiment of the present application.

[0020] Description of reference numerals:

[0021] 1. First steel sheet pile component; 11. Locking strip; 2. Second steel sheet pile component; 3. Steel pipe pile component; 31. Side buckle strip; 4. Backfill soil; 5. Peripheral purlin. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below with reference to the accompanying drawings. The present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0023] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0025] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0026] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0027] refer to Figures 1 to 3 The present application provides a composite steel sheet pile cofferdam structure, which is arranged in a semi-land and semi-water condition and is used to cooperate with a embankment to form a cofferdam. The composite steel sheet pile cofferdam structure includes a water retaining layer, a closed supporting layer, and backfill soil 4 filled between the water retaining layer and the closed supporting layer.

[0028] The water retaining layer is composed of a steel pipe pile component 3 and a first steel sheet pile component 1 locked to the steel pipe pile component 3, which are continuously connected. The steel pipe pile component 3 is driven into the bottom of a preset base and the pile top elevation is higher than the preset maximum water level. The first steel sheet pile component 1 is driven to the preset base and the pile top elevation is at least slightly higher than the preset maximum water level. The steel pipe pile component 3 is used to support the first steel sheet pile component 1 to ensure the stability of the first steel sheet pile component 1. The first steel sheet pile component 1 is used to retain water between the preset base of the cofferdam and the preset maximum water level. The opening of the open water retaining layer faces the embankment and is closed by the embankment, so that the open water retaining layer cooperates with the embankment to form a closed water retaining layer.

[0029] The closed supporting layer is a closed second steel sheet pile component 2, which is injected to a preset bottom embedded position and the pile top elevation is between a preset base and a preset maximum water level. The closed second steel sheet pile component 2 is used to stabilize the foundation pit between the preset base of the cofferdam and the preset bottom embedded position.

[0030] The closed supporting layer is located on the inner side of the open water retaining layer, so that an interlayer is formed between the closed supporting layer and the open water retaining layer, and the backfill soil 4 is filled in the interlayer.

[0031] It can be understood that under the condition of half land and half water, the open water retaining layer is arranged on the water side and the two ends of the opening are embedded in the embankment soil, and part of the closed supporting layer is located on the water side and part is located on the land side.

[0032] The composite steel sheet pile cofferdam structure of the present application is designed for the cofferdam project of the bridge pedestal on half land and half water, and the functions of the cofferdam structure are decomposed. The open water retaining layer is formed by the cooperation of the first steel sheet pile component 1 and the embankment to form a closed water retaining layer, which bears the water blocking function of the cofferdam. The first steel sheet pile component 1 is supported by the steel pipe pile component 3 without the need for internal support; the closed support layer is stabilized by the second steel sheet pile component 2 embedded in the base, and the top elevation of the steel sheet pile is lower than the preset maximum water level; the backfill soil 4 is used to enhance the integrity of the open water retaining layer and the closed support layer to maintain the structural stability of the cofferdam; thereby, the cofferdam performance under half land and half water conditions can be guaranteed, and through such a structural decomposition design, the overall height of the cofferdam is achieved by the joint of the first steel sheet pile component 1 and the second steel sheet pile component 2, thereby avoiding the excessive length of the steel sheet piles required and a series of problems caused by them.

[0033] Specifically, refer to Figure 1 , the height of the first steel sheet pile component 1 is H1, the height of the second steel sheet pile component 2 is H2, the height from the preset base of the cofferdam to the preset maximum water level is h1, and the height of the second steel sheet pile component 2 above the preset base of the cofferdam is h2, then: H1<H2, h1

[0034] Specifically, the first steel sheet pile component 1 is formed by a plurality of first steel sheet piles with a height of H1 being sequentially locked and connected, and the second steel sheet pile component 2 is formed by a plurality of second steel sheet piles with a height of H2 being sequentially locked and connected end to end.

[0035] It can be understood that the first steel sheet piles constituting the first steel sheet pile component 1 are shorter, while the second steel sheet piles constituting the second steel sheet pile component 2 are longer; although the second steel sheet piles are longer than the first steel sheet piles, their pile tops are lower than the preset maximum water level, so the length of the second steel sheet piles is smaller than the length of the steel sheet piles required for a single-layer steel sheet pile cofferdam, and thus there will be no construction problems caused by excessive pile length. ​

[0036] In an embodiment of the present application, the first steel sheet piles and the second steel sheet piles are both U-shaped steel sheet piles, both sides of the U-shaped steel sheet piles are provided with locking strips 11, and the two adjacent first steel sheet piles on the first steel sheet pile component 1 and the two adjacent second steel sheet piles on the second steel sheet pile component 2 are locked by the mutual engagement of the two locking strips 11.

[0037] For further reference, Figure 4 The steel pipe pile component 3 has a side buckle strip 31, and the first steel sheet pile and the steel pipe pile component 3 are locked by the engagement of the locking strip 11 with the side buckle strip 31.

[0038] In other embodiments, the first steel sheet pile and the second steel sheet pile may also be Z-shaped steel sheet piles, and the locking of two adjacent Z-shaped steel sheet piles and the locking of the Z-shaped steel sheet pile and the steel pipe pile component 3 may be carried out in the same manner as the U-shaped steel sheet pile.

[0039] In the examples of this application, reference is made to Figure 2 and Figure 3 A surrounding purlin 5 is provided on the inner side of the closed supporting layer.

[0040] In the embodiment of the present application, the backfill soil 4 includes plain backfill soil and sandbags.

[0041] A construction method of a composite steel sheet pile cofferdam structure of the present application comprises the following steps:

[0042] S1. Locate the cofferdam range according to the engineering survey data, and set the preset cofferdam boundary, preset base, preset maximum water level and preset bottom embedding position according to the construction environment and construction requirements.

[0043] S2, driving steel pipe pile members 3 outside the boundary of the preset cofferdam on the water side;

[0044] S3, mark the center line of the first steel sheet pile component 1 between two adjacent steel pipe pile components 3, insert the first steel sheet pile, and lock the first steel sheet piles on both sides to the steel pipe pile components 3, finally forming an open water retaining layer;

[0045] S4, embedding the two ends of the opening of the open water retaining layer into the embankment soil, so that it cooperates with the embankment to form a closed water retaining layer; when embedding, the embankment is sloped and then the first steel sheet pile component 1 is driven. When the first steel sheet pile component 1 is driven, it is embedded into the embankment soil until the structure is stable. Finally, the embedded joints of the embankment are repaired and reinforced to prevent the outer river water from invading the cofferdam and maintain the stability of the river bank.

[0046] S5. Use a pump or a dewatering well to dewater the closed water retaining layer to form a waterless working environment;

[0047] S6. Driving a second steel sheet pile member 2 according to the preset cofferdam boundary to form a closed supporting layer;

[0048] S7, installing the purlin 5 support member inside the second steel sheet pile member 2;

[0049] S8. Backfill plain soil and sandbags between the closed support layer and the open water retaining layer to strengthen the integrity of the cofferdam.

[0050] In a specific construction project, a plurality of steel pipe pile components 3 are distributed at intervals along the periphery of a preset cofferdam boundary. When a construction platform is provided on the water side of the cofferdam, the steel pipe pile components 3 can come from the construction platform, and the preset cofferdam boundary can be arranged according to the geometric relationship between the water side construction platform and the river bank.

[0051] The composite steel sheet pile cofferdam structure of the present application is provided with a first steel sheet pile component 1 of shorter height on the outer layer of the cofferdam according to the relative position relationship between the river bank and the cofferdam. Both ends of the first steel sheet pile component 1 are embedded in the embankment soil, making full use of the strength and airtightness of the embankment soil, and cooperating with the embankment soil and stone to form a closed water retaining layer, which undertakes the water-blocking function of the bridge pedestal cofferdam; the foundation pit stabilization function of the cofferdam is achieved by a second steel sheet pile component 2 whose height is not too high, so that the required steel sheet pile length is effectively shortened, thereby reducing the construction difficulty and saving the construction period; sand bags and plain fill are filled between the first steel sheet pile component 1 and the second steel sheet pile component 2 to improve the overall stability of the cofferdam.

[0052] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] The above-described embodiments only express several implementation methods of the present application and should not be construed as limiting the scope of the patent application. It should be noted that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be subject to the attached claims.

Claims

1. A composite steel sheet pile cofferdam structure, characterized in that: The composite steel sheet pile cofferdam structure is arranged under semi-land and semi-water conditions, and is used to cooperate with the embankment to form a cofferdam. The composite steel sheet pile cofferdam structure includes an open water retaining layer and a closed supporting layer; the open water retaining layer is composed of a steel pipe pile component and a first steel sheet pile component locked to the steel pipe pile component, which are continuously connected, and the steel pipe pile component is used to support the first steel sheet pile component, and the first steel sheet pile component is used to retain water between the height of the preset base of the cofferdam and the preset highest water level, and the opening of the open water retaining layer faces the embankment and is closed by the embankment, so that the open water retaining layer cooperates with the embankment to form a closed water retaining layer; the closed supporting layer is a closed second steel sheet pile component, which is used to stabilize the foundation pit between the height of the preset base of the cofferdam and the preset bottom embedding position; the top of the closed supporting layer is higher than the preset base and lower than the preset highest water level, and the closed supporting layer is located on the inner side of the open water retaining layer, so that an interlayer is formed between the closed supporting layer and the open water retaining layer, and the interlayer is filled with backfill soil.

2. The composite steel sheet pile cofferdam structure according to claim 1, characterized in that: The height of the first steel sheet pile component is H1, the height of the second steel sheet pile component is H2, the height from the preset base of the cofferdam to the preset maximum water level is h1, and the height of the second steel sheet pile component above the preset base of the cofferdam is h2, then: H1<H2, h1<H1, h2<h1.

3. The composite steel sheet pile cofferdam structure according to claim 2, characterized in that: The first steel sheet pile component is formed by a plurality of first steel sheet piles with a height of H1 being sequentially locked and connected, and the second steel sheet pile component is formed by a plurality of second steel sheet piles with a height of H2 being sequentially locked and connected end to end.

4. The composite steel sheet pile cofferdam structure according to claim 3 is characterized in that: The first steel sheet pile and the second steel sheet pile are both one of U-shaped steel sheet piles and Z-shaped steel sheet piles.

5. The composite steel sheet pile cofferdam structure according to claim 3 or 4, characterized in that: Both sides of the first steel sheet pile and both sides of the second steel sheet pile are provided with locking strips, and the two adjacent first steel sheet piles on the first steel sheet pile component and the two adjacent second steel sheet piles on the second steel sheet pile component are locked by the mutual engagement of the two locking strips.

6. The composite steel sheet pile cofferdam structure according to claim 5, characterized in that: The steel pipe pile component has a side buckle bar, and the first steel sheet pile is locked to the steel pipe pile component by the locking bar engaging with the side buckle bar.

7. The composite steel sheet pile cofferdam structure according to claim 1, characterized in that: A surrounding purlin is arranged on the inner side of the closed supporting layer.

8. The composite steel sheet pile cofferdam structure according to claim 1, characterized in that: The backfill soil includes plain fill soil and sandbags.

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