Inclined riverbed surface bottomless steel hanging box cofferdam limiting device

Abstract

The utility model discloses a limiting device for a bottomless steel hanging box cofferdam on an inclined riverbed surface. The limiting device structurally comprises a pile foundation steel casing, a bottomless steel hanging box cofferdam, a cofferdam inner steel support, a suspension system, a guide steel sleeve and a positioning pile. The structure is used for installing the steel cofferdam under the condition of an inclined riverbed, the limiting device solves the problems that the bottom of the bottomless steel hanging box cofferdam floats and swings and is difficult to position due to the influence of water flow after the bottomless steel hanging box cofferdam is lowered to the bed, and can adapt to the construction condition of the inclined riverbed; the guide devices are arranged on the outer wall of the cofferdam to enable the positioning piles to penetrate into the riverbed bedrock for anchoring, horizontal positioning of the bottomless steel hanging box cofferdam is achieved, the method is simple and feasible, construction is convenient, and the safety performance of the cofferdam is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of steel cofferdam construction, in particular to a bottomless steel hanging box cofferdam limiting device on an inclined riverbed surface. Background Art

[0002] As an important retaining structure for water-related construction, steel cofferdam can provide a closed dry environment for construction work and is widely used in the construction of water-related bridge abutments and piers.

[0003] Currently, two types of cofferdams are commonly used in deepwater construction: steel-cased steel cofferdams and steel hanging-box cofferdams. The former is suitable for leveling the riverbed and is mostly embedded with blade feet. After the cofferdam is lowered into place, the blade feet are embedded in the soil layer to stabilize it, thereby achieving horizontal limitation of the cofferdam. The latter is usually set to a bottom-mounted form. After the cofferdam is lowered into place, the horizontal limitation of the cofferdam is achieved through the limited space between the bottom plate and the steel casing.

[0004] For the construction of high pile foundations on inclined riverbeds, a bottomless steel box cofferdam construction method was proposed for the first time, which avoids the complex bottom plate and blade foot structure design. At the same time, it is not affected by the evolution of the riverbed caused by water erosion, has strong terrain adaptability and high economic efficiency. However, this type of suspended structure is more sensitive to water flow and it is difficult to achieve plane position positioning. In view of this, a bottomless steel box cofferdam limiter device is proposed to solve the problems of floating swing and difficulty in positioning of the bottom of the bottomless steel box cofferdam. Utility Model Content

[0005] Therefore, in order to solve the above-mentioned shortcomings, the utility model provides a limiting device for a bottomless steel box cofferdam on an inclined riverbed; this structure is used for the installation of a steel cofferdam under inclined riverbed conditions, and the limiting device solves the problems of the bottom floating and swinging, and difficulty in positioning of the bottomless steel box cofferdam caused by the influence of water flow after the cofferdam is lowered to the bed. It can adapt to the construction conditions of an inclined riverbed, and by arranging a guide device on the outer wall of the cofferdam to anchor the positioning piles deep into the bedrock of the riverbed, the horizontal positioning of the bottomless steel box cofferdam is achieved. This method is simple and feasible, and the construction is convenient, which improves the safety performance of the cofferdam.

[0006] The utility model is achieved in that a limiting device for a bottomless steel box cofferdam on an inclined riverbed is constructed, and is characterized in that: the limiting device structure comprises: a pile foundation steel casing, a bottomless steel box cofferdam, a steel support inside the cofferdam, a suspension system, a guide steel casing, and positioning piles; the bottomless steel box cofferdam is connected to the suspension system and is suspended in water by the suspension system, a steel distribution beam is arranged on the top of the pile foundation steel casing, a suspension system is installed on the steel distribution beam, positioning piles are installed on the outer side of the bottomless steel box cofferdam, a layer of guide steel casing is arranged on the outer side of the bottomless steel box cofferdam, and the guide steel casing is welded to the outer wall of the bottomless steel box cofferdam.

[0007] According to the utility model, the bottomless steel hanging box cofferdam limiting device on the inclined riverbed surface is characterized in that an inner steel support of the cofferdam is arranged inside the bottomless steel hanging box cofferdam.

[0008] According to the utility model, the bottomless steel hanging box cofferdam limiting device on the inclined riverbed is characterized in that: the bottomless steel hanging box cofferdam is a bottomless enclosure structure made of steel plates and stiffening components and suspended in the water, and forms a steel cofferdam for construction space by retaining water.

[0009] According to the utility model, the bottomless steel hanging box cofferdam limiting device on the inclined riverbed is characterized in that: the suspension system: uses the pile foundation steel casing as a support, arranges a steel distribution beam on the top, adopts a pull rod multi-point suspension steel cofferdam structure, and uses a hydraulic jack to realize the synchronous lifting and lowering of the steel cofferdam.

[0010] According to the utility model, the bottomless steel hanging box cofferdam limiting device for the inclined riverbed is characterized in that: the guide steel casing is made of φ1000×80 steel pipe with a length of 30 cm, which is welded to a semi-open "trumpet" shaped guide joint to form a whole. A layer of guide steel casing is arranged on each segment cofferdam and welded to the outer wall of the steel cofferdam. Two layers are arranged on each surface. It should be ensured that each layer of steel casing is vertically coaxial to facilitate the insertion and installation of positioning piles.

[0011] According to the utility model, the limiting device for the bottomless steel hanging box cofferdam on the inclined riverbed is characterized by: the positioning piles: the positioning piles are made of φ820×12 steel pipes. After the bottomless steel hanging box cofferdam is lowered and stabilized, the vertically hoisted positioning piles are inserted and sunk through the guide steel casing, and holes are punched at the bottom by an impact drill to embed the pile bottom into the rock, the rock penetration depth is not less than 1m, and concrete is poured in the pipe to fix the root to form the cofferdam positioning piles.

[0012] The utility model has the following advantages: The utility model provides a limiting device for a bottomless steel box cofferdam on an inclined riverbed; this structure is used for the installation of steel cofferdams on inclined riverbed conditions, and the limiting device solves the problems of bottom floating and swinging, and difficulty in positioning caused by the influence of water flow after the bottomless steel box cofferdam is placed on the bed. It can adapt to the construction conditions of inclined riverbeds, and the positioning piles are anchored deep into the bedrock of the riverbed by arranging a guide device on the outer wall of the cofferdam, thereby realizing the horizontal positioning of the bottomless steel box cofferdam. This method is simple and feasible, and the construction is convenient, which improves the safety performance of the cofferdam. Specifically,

[0013] (1) The device can effectively solve the problem of plane limitation of bottomless steel box cofferdam on inclined riverbed surface. It has simple and reliable structure and convenient construction.

[0014] (2) It avoids the complicated design and manufacturing of blade feet, and does not need to set the bottom plate guide limit. It has strong practicality and economy, and greatly improves the construction efficiency;

[0015] (3) The use of the limiting device solves the problem of difficulty in cofferdam positioning and construction caused by uneven foundation, and is universal for different riverbed foundation linearities. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a partial view of the limit device of the bottomless steel hanging box cofferdam on the inclined riverbed;

[0017] Figure 2 It is the elevation view of the limit device of bottomless steel hanging box cofferdam on the inclined riverbed;

[0018] Figure 3 It is a plan view of the limiting device of the bottomless steel hanging box cofferdam on the inclined riverbed.

[0019] Among them: pile foundation steel casing 1, bottomless steel hanging box cofferdam 2, steel support inside the cofferdam 3, suspension system 4, guide steel casing 5, positioning piles 6. DETAILED DESCRIPTION

[0020] The following will be combined with the attached Figure 1-Figure 3 The utility model is described in detail, and the technical solutions in the embodiments of the utility model are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] The utility model provides a bottomless steel hanging box cofferdam limiting device on an inclined riverbed surface, such as Figure 1-Figure 3 As shown, the structure of the limit device includes: a pile foundation steel casing 1, a bottomless steel hanging box cofferdam 2, a steel support inside the cofferdam 3, a suspension system 4, a guide steel casing 5, and a positioning pile 6;

[0022] The bottomless steel hanging box cofferdam 2 is connected to the suspension system 4 and is suspended in the water by the suspension system 4;

[0023] A steel distribution beam is arranged on the top of the pile foundation steel casing 1, and a suspension system 4 is installed on the steel distribution beam.

[0024] Positioning piles 6 are installed outside the bottomless steel box cofferdam 2.

[0025] A layer of guide steel casing 5 is arranged on the outer side of the bottomless steel hanging box cofferdam 2 , and the guide steel casing 5 is welded to the outer wall of the bottomless steel hanging box cofferdam 2 .

[0026] like Figure 3 As shown, when the bottomless steel hanging box cofferdam limiting device for the inclined riverbed surface of the utility model is implemented, the inner steel support 3 of the cofferdam is arranged inside the bottomless steel hanging box cofferdam 2.

[0027] like Figure 2 and Figure 3 As shown, when the limiting device of the bottomless steel hanging box cofferdam on the inclined riverbed surface of the utility model is implemented; the bottomless steel hanging box cofferdam 2: a bottomless retaining structure made of steel plates and their stiffening components, suspended in the water, a steel cofferdam that forms a construction space by retaining water.

[0028] like Figure 2 and Figure 3 As shown, when the bottomless steel hanging box cofferdam limiting device for the inclined riverbed surface of the utility model is implemented; the suspension system 4: uses the pile foundation steel casing 1 as a support, arranges a steel distribution beam on its top, adopts a pull rod multi-point suspension steel cofferdam structure, and uses a hydraulic jack to realize the synchronous lifting and lowering of the steel cofferdam.

[0029] like Figure 1-Figure 3 As shown, when the limiting device of the bottomless steel hanging box cofferdam on the inclined riverbed surface of the utility model is implemented; the guide steel casing 5: adopts φ1000×80 steel pipe, the length is 30cm, and it is welded with a semi-open "trumpet" shaped guide joint head to form a whole. Each segment cofferdam is provided with a layer of guide steel casing 5, which is welded to the outer wall of the steel cofferdam, and two are arranged on each surface. It should be ensured that each layer of steel casing is vertically coaxial to facilitate the insertion and installation of positioning piles.

[0030] like Figure 2 and Figure 3 As shown, when the limiting device of the bottomless steel hanging box cofferdam on the inclined riverbed surface of the utility model is implemented; the positioning pile 6: the positioning pile adopts φ820×12 steel pipe. After the bottomless steel hanging box cofferdam is lowered and stabilized, the vertically hoisted positioning pile is inserted and sunk through the guide steel casing, and the bottom is punched with an impact drill to embed the bottom of the pile into the rock, the depth of penetration into the rock is not less than 1m, and concrete is poured in the pipe to fix the root to form the cofferdam positioning pile.

[0031] A method for limiting the bottomless steel hanging box cofferdam on an inclined riverbed, the implementation method is as follows:

[0032] Step 1: Assemble the steel cofferdam segments, weld the guide steel casing on the outer wall of each segment according to the designed position, install the inner support of the cofferdam, and connect the segments to form a bottomless steel cofferdam as a whole;

[0033] Step 2: Install the steel distribution beam on the top of the pile foundation steel casing, lay out the steel tie rods and tension jacks to form a suspension system;

[0034] Step 3: Fill the cofferdam wall with water and sink it to the designed position to level the cofferdam top elevation;

[0035] Step 4: The vertically hoisted positioning piles are inserted and sunk through the guide steel casing. The bottom is punched with an impact drill to embed the pile bottom into the rock. The rock penetration depth is not less than 1m. Underwater concrete is poured in the pipe to increase the stability of the positioning piles and limit the horizontal displacement of the cofferdam.

[0036] Step 5: After cleaning the base, dump gravel and level the base. Pour the cofferdam cushion layer, bottom concrete and sandwich concrete on the gravel in sequence according to the design requirements. After pumping out the water to form a dry working environment, the foundation construction can be carried out.

[0037] This patent has the following advantages and beneficial effects:

[0038] (1) The device can effectively solve the problem of plane limitation of bottomless steel box cofferdam on inclined riverbed surface. It has simple and reliable structure and convenient construction.

[0039] (2) It avoids the complicated design and manufacturing of blade feet, and does not need to set the bottom plate guide limit. It has strong practicality and economy, and greatly improves the construction efficiency;

[0040] (3) The use of the limiting device solves the problem of difficulty in cofferdam positioning and construction caused by uneven foundation, and is universal for different riverbed foundation linearities.

[0041] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A bottomless steel hanging box cofferdam limiting device on an inclined riverbed, characterized in that; The limit device structure comprises: a pile foundation steel casing (1), a bottomless steel hanging box cofferdam (2), a steel support inside the cofferdam (3), a suspension system (4), a guide steel casing (5), and positioning piles (6); the bottomless steel hanging box cofferdam (2) is connected to the suspension system (4) and is suspended in water by the suspension system (4); a steel distribution beam is arranged on the top of the pile foundation steel casing (1), and the suspension system (4) is installed on the steel distribution beam; positioning piles (6) are installed on the outer side of the bottomless steel hanging box cofferdam (2); a layer of guide steel casing (5) is arranged on the outer side of the bottomless steel hanging box cofferdam (2); and the guide steel casing (5) is welded to the outer wall of the bottomless steel hanging box cofferdam (2).

2. According to claim 1, the bottomless steel hanging box cofferdam limiting device for the inclined riverbed surface is characterized in that: A cofferdam inner steel support (3) is arranged inside the bottomless steel hanging box cofferdam (2).

3. According to claim 1, the bottomless steel hanging box cofferdam limiting device for the inclined riverbed surface is characterized in that: The bottomless steel hanging box cofferdam (2) is a bottomless enclosure structure made of steel plates and their stiffening components and suspended in water, and is a steel cofferdam that forms a construction space by retaining water.

4. According to claim 1, the bottomless steel hanging box cofferdam limiting device for the inclined riverbed surface is characterized in that: The guide steel casing (5) is made of a φ1000×80 steel pipe with a length of 30 cm. It is welded to a semi-open "trumpet"-shaped guide joint to form a whole. Each segment of the cofferdam is provided with a layer of guide steel casing (5) which is welded to the outer wall of the steel cofferdam. Two layers are arranged on each surface. It should be ensured that each layer of steel casing is vertically coaxial to facilitate the insertion and installation of positioning piles.

5. According to claim 1, the bottomless steel hanging box cofferdam limiting device for the inclined riverbed surface is characterized in that: The positioning pile (6) is made of φ820×12 steel pipe.

Images