Construction method of deep water bare rock cofferdam

Abstract

The application relates to a construction method of a deep-water bare rock cofferdam, and belongs to the technical field of cofferdam construction. The construction method of the deep-water bare rock cofferdam comprises the following steps: assembling a ring beam on a steel casing; installing a hanging system at the top end of the steel casing, and lowering the ring beam to a preset position by using a finished rolled threaded steel bar system in the hanging system; supporting the ring beam on a rock stratum by using a plurality of supporting pieces; and inserting and driving a lock-buckle steel pipe pile guided by the ring beam. The construction method ingeniously supports the suspended ring beam on the rock stratum by using the supporting pieces, increases the safety factor in the construction process, has the advantages of low construction cost, simple construction method, quick and convenient operation, strong practicality and the like, and can improve the construction efficiency; meanwhile, in the process of inserting and driving the lock-buckle steel pipe pile, if the finished rolled threaded steel bar is broken due to shearing, the ring beam can transmit the dead weight to the rock stratum through the supporting pieces, so that safety accidents are avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the cofferdam construction technical field, in particular to a deep water bare rock cofferdam construction method. BACKGROUND

[0002] The cofferdam refers to the temporary enclosure structure built in the construction of water conservancy projects for the construction of permanent water conservancy facilities. Its function is to prevent water and soil from entering the construction site of the building, so as to drain water in the cofferdam, excavate the foundation pit, and build the building. Generally, it is mainly used in hydraulic structures, and the cofferdam is generally removed after use. The cofferdam is higher than the highest water level that may occur during the construction period.

[0003] With the development of bridge technology and the demand for crossing rivers, lakes and seas, more and more deep water bare rock foundations have emerged. In order to meet the stress requirements of steel pipe piles, the traditional deep water bare rock cofferdam adopts the construction method of pre-lowering the ring beam.

[0004] However, this method uses fine rolled threaded steel to suspend the ring beam, and when the lock steel pipe pile is inserted and driven, the ring beam is easily disturbed, causing the fine rolled threaded steel to be sheared, and the fine rolled threaded steel has poor shearing capacity, which easily causes safety accidents such as fine rolled threaded steel fracture during construction. SUMMARY

[0005] The embodiment of the present application provides a deep water bare rock cofferdam construction method to solve the problem of safety accidents such as fine rolled threaded steel fracture in the related art.

[0006] The embodiment of the present application provides a deep water bare rock cofferdam construction method, including the following steps:

[0007] Assembling the ring beam on the steel casing;

[0008] Installing a hanging system at the top end of the steel casing, and lowering the ring beam to the preset position by using the fine rolled threaded steel bar system in the hanging system;

[0009] Supporting the ring beam on the rock layer by using a plurality of support pieces;

[0010] Inserting and driving the lock steel pipe pile guided by the ring beam.

[0011] In some embodiments, the step of supporting the ring beam on the rock layer by using a plurality of support pieces specifically includes the following steps:

[0012] Determining the length of the support piece by the vertical distance from the preset position of the ring beam to the rock layer;

[0013] Before the circle beam is lowered, a plurality of support members are fixed on the circle beam so that the plurality of support members are lowered synchronously with the circle beam.

[0014] In some embodiments, when the circle beam is lowered to the preset position, if there is a gap between the support member and the rock stratum, the gap is filled with a shim.

[0015] In some embodiments, the step of supporting the circle beam on the rock stratum by the plurality of support members comprises the following steps:

[0016] Before the circle beam is lowered, the plurality of support members are inserted and fixed on the rock stratum so that the support ends of the plurality of support members are located at the preset position of the circle beam.

[0017] In some embodiments, the step of assembling the circle beam on the steel casing comprises the following steps:

[0018] The steel casing is connected, and the plurality of layers of carriers are sequentially welded on the steel casing from bottom to top, and the circle beam is assembled on each layer of carrier;

[0019] The plurality of layers of circle beams are connected into one body by the connecting system.

[0020] In some embodiments, the step of lowering the circle beam to the preset position by the fine rolled threaded steel bar system in the hoisting system comprises the following steps:

[0021] The fine rolled threaded steel bar system is anchored on the circle beam by the anchor bolt;

[0022] The carriers are removed, and the circle beam is lowered to the preset position as a whole by the jack system in the hoisting system.

[0023] In some embodiments, each layer of the circle beam is provided with a reserved hole for the fine rolled threaded steel bar system to pass through, and the fine rolled threaded steel bar system passes through each layer of the circle beam in sequence and is fixedly connected with the circle beam.

[0024] In some embodiments, the circle beam is in a rectangular shape, the inner side of the circle beam is fixed with a cross brace, the four corners of the circle beam are fixed with diagonal braces, and the circle beam and / or the cross brace and / or the diagonal brace are provided with the support member.

[0025] In some embodiments, the inner side of the circle beam is provided with a limiting frame that is in sliding connection with the steel casing.

[0026] In some embodiments, the step of inserting and driving the lock steel pipe pile guided by the circle beam comprises the following steps:

[0027] A guide frame is installed on the steel casing, and the lock steel pipe pile is inserted and driven guided by the guide frame and the circle beam;

[0028] The lock steel pipe pile is inserted and driven to a preset depth so that the bottom end of the lock steel pipe pile is embedded in the rock stratum.

[0029] The technical scheme provided by the application has the beneficial effects of:

[0030] The application provides a construction method of a deep-water bare rock cofferdam.

[0031] Assembling a ring beam on the steel casing;

[0032] Installing a hanging system at the top end of the steel casing, and lowering the ring beam to a preset position by using a finished rolled threaded steel bar system in the hanging system;

[0033] Supporting the ring beam on the rock stratum by using a plurality of support members;

[0034] Inserting and driving a lock-buckle steel pipe pile guided by the ring beam.

[0035] Therefore, the application has the following advantages:

[0036] (1) The construction cost is low, the construction method is simple, and the construction efficiency can be improved.

[0037] (2) The suspended ring beam is directly supported on the rock stratum by using the support members, and the safety factor of the construction process is increased.

[0038] (3) In the process of inserting and driving the lock-buckle steel pipe pile, if the finished rolled threaded steel bar is broken due to shearing, the ring beam can transmit the dead weight to the rock stratum through the support members, and the occurrence of safety accidents is avoided. DETAILED DESCRIPTION

[0039] In order to more clearly illustrate the technical scheme in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0040] Fig. 1 The structural schematic diagram of the embodiment of the application;

[0041] Fig. 2 The structural schematic diagram of the hanging system of the embodiment of the application;

[0042] Fig. 3 The structural schematic diagram of the ring beam of the embodiment of the application.

[0043] In the drawings, the components represented by the numbers are listed as follows:

[0044] 1, steel casing;

[0045] 2, hanging system; 21, finished rolled threaded steel bar system; 22, jack system;

[0046] 3, ring beam; 31, cross brace; 32, diagonal brace; 33, limiting frame; 4, support;

[0047] 5, lock steel pipe pile; 6, base plate; 7, bracket; 8, connection system. DETAILED DESCRIPTION

[0048] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0049] The embodiments of the present application provide a construction method of a deep-water bare rock cofferdam, which can solve the problem in the prior art that the use of finished rolled thread steel to suspend and lower a ring beam can easily disturb the ring beam when lock steel pipe piles are inserted and driven, so that the finished rolled thread steel is sheared, the shearing capacity of the finished rolled thread steel is poor, and the finished rolled thread steel is prone to breaking in the construction process.

[0050] Referring to Figs. 1 to 3 The embodiments of the present application provide a construction method of a deep-water bare rock cofferdam, which includes the following steps:

[0051] S1. Assembling a ring beam 3 on a steel casing 1;

[0052] S2. Installing a hanging system 2 at the top end of the steel casing 1, and lowering the ring beam 3 to a preset position by using a finished rolled thread steel system 21 in the hanging system 2;

[0053] S3. Supporting the ring beam 3 on a rock stratum by using a plurality of support members 4;

[0054] S4. Inserting and driving lock steel pipe piles 5 guided by the ring beam 3.

[0055] In specific implementation, the ring beam 3 is assembled above the water surface, when the height of the steel casing 1 is not enough, the height can be connected to ensure that the steel casing 1 extends out of the water surface to a sufficient height to facilitate the construction of the ring beam 3. When the ring beam 3 is lowered to the preset position by using the finished rolled thread steel system 21 in the hanging system 2, the ring beam 3 is supported on the rock stratum by using the plurality of support members 4, the support members 4 can be steel columns, to ensure that the weight of the ring beam 3 can be transmitted to the rock stratum through the support members 4, and then the lock steel pipe piles 5 are inserted and driven guided by the ring beam 3 and the cofferdam is constructed. In the process of inserting and driving the lock steel pipe piles 5 guided by the ring beam 3, if the finished rolled thread steel system 21 is broken due to shearing, the ring beam 3 can transmit the weight to the rock stratum through the support members 4, to avoid the occurrence of safety accidents, and thus the safety factor of the construction process is increased.

[0056] It should be noted that in addition to the above rock formation construction environment, the construction method of the present application is also applicable to other construction environments, such as hard soil layer and soft soil layer, etc. The support 4 can be provided to improve the safety factor during construction.

[0057] In some optional embodiments: referring to Figs. 1 to 3 The embodiment of the present application provides a construction method of a deep water bare rock cofferdam, wherein the ring beam 3 is supported on the rock layer by the plurality of supports 4, and the construction method specifically comprises the following steps:

[0058] The length of the support 4 is determined by the vertical distance from the preset position of the ring beam 3 to the rock layer.

[0059] Before the ring beam 3 is lowered, the plurality of supports 4 are fixed on the ring beam 3, so that the plurality of supports 4 are lowered synchronously with the ring beam 3.

[0060] The plurality of supports 4 of the embodiment of the present application are welded in advance at the bottom of the bottom ring beam 3 before the ring beam 3 is lowered. When the ring beam 3 is lowered by using the finish rolling threaded steel bar system 21 in the hoisting system 2, the plurality of supports 4 are lowered synchronously with the ring beam 3. When the ring beam 3 is lowered to the preset position, the plurality of supports 4 can abut against the rock layer to support the ring beam 3.

[0061] It should be noted that the support 4 is fixed in advance on the ring beam 3, and since the ring beam 3 has not been lowered into the deep water, the construction is convenient. The length of the support 4 is the vertical distance from the preset position of the ring beam 3 to the rock layer, which can be measured underwater before lowering to ensure accuracy.

[0062] In some optional embodiments: referring to Figs. 1 to 3 The embodiment of the present application provides a construction method of a deep water bare rock cofferdam, which makes the plurality of supports 4 lower synchronously with the ring beam 3. After the ring beam 3 is lowered to the preset position, if there is a gap between the support 4 and the rock layer, the gap is filled and compacted by using the backing plate 6.

[0063] The plurality of supports 4 of the embodiment of the present application are fixed on the ring beam 3, and the plurality of supports 4 are lowered synchronously with the ring beam 3. After the ring beam 3 is lowered to the preset position, it is necessary to ensure that each support 4 can abut against the rock layer to support the ring beam 3. If there is a gap between the support 4 and the rock layer, the gap can be filled and compacted by using the backing plate 6 to ensure that the weight of the ring beam 3 can be transmitted to the rock layer by the support 4. The backing plate 6 can be a steel plate.

[0064] In some optional embodiments: referring to Figs. 1 to 3 The embodiment of the present application provides a construction method of a deep water bare rock cofferdam, wherein the ring beam 3 is supported on the rock layer by the plurality of supports 4, and the construction method specifically comprises the following steps:

[0065] Before the circle beam 3 is lowered, a plurality of support members 4 are inserted and fixed on the rock stratum so that the support ends of the plurality of support members 4 are located at the preset position of the lowering of the circle beam 3.

[0066] The plurality of support members 4 of the embodiment of the present application are inserted and fixed on the rock stratum in advance before the circle beam 3 is lowered, and the support ends of the plurality of support members 4 are ensured to be located at the preset position of the lowering of the circle beam 3. When the circle beam 3 is lowered to the preset position by the finished rolled threaded steel bar system 21 in the hoisting system 2, the weight of the circle beam 3 can be transmitted to the rock stratum through the support members 4. The support members 4 are inserted and fixed in advance, which can ensure stable support and avoid the sinking of the support ends of the support members 4.

[0067] In some optional embodiments, referring to Figs. 1 to 3 The embodiment of the present application provides a construction method of a deep water bare rock cofferdam, wherein the assembling of the circle beam 3 on the steel casing 1 comprises the following steps:

[0068] The high steel casing 1 is connected, and a plurality of layers of brackets 7 are sequentially welded on the steel casing 1 from bottom to top, and the circle beam 3 is assembled on each layer of bracket 7;

[0069] The plurality of layers of circle beams 3 are connected into one body by the connecting system 8.

[0070] The circle beam 3 is assembled on each layer of bracket 7, and the circle beam 3 can be assembled by hoisting. For the convenience of hoisting, the circle beam 3 can be assembled from bottom to top. That is, one layer of circle beam 3 is assembled after one layer of bracket 7 is welded, and the adjacent two layers of circle beams 3 are fixed and connected by welding a plurality of connecting systems 8. The connecting system 8 comprises two vertical rods and an inclined rod welded between the two vertical rods. After the plurality of layers of circle beams 3 are connected into one body by the connecting system 8, the hoisting system 2 can conveniently lower the whole circle beam 3.

[0071] In some optional embodiments, referring to Figs. 1 to 3 The embodiment of the present application provides a construction method of a deep water bare rock cofferdam, wherein the lowering of the circle beam 3 to the preset position by the finished rolled threaded steel bar system 21 in the hoisting system 2 comprises the following steps:

[0072] The finished rolled threaded steel bar system 21 is anchored on the circle beam 3 by an anchor bolt;

[0073] The bracket 7 is removed, and the whole circle beam 3 is lowered to the preset position by the jack system 22 in the hoisting system 2.

[0074] The finished rolled threaded steel bar system 21 of the embodiment of the present application is anchored on the circle beam 3 by an anchor bolt. After the finished rolled threaded steel bar system 21 is connected with the circle beam 3, the welded bracket 7 needs to be removed by cutting, so as to facilitate the cooperation of the jack system 22 in the hoisting system 2 and the finished rolled threaded steel bar system 21 to lower the whole circle beam 3 to the preset position.

[0075] In some optional embodiments, referring to Figs. 1 to 3 As shown in the figure, the embodiment of the present application provides a construction method of a deep-water bare rock cofferdam, and each layer of ring beam 3 of the construction method of the deep-water bare rock cofferdam is provided with a reserved hole for penetrating a finished rolled threaded steel bar system 21, and the finished rolled threaded steel bar system 21 penetrates through each layer of ring beam 3 in turn and is fixedly connected with the ring beam 3.

[0076] Each layer of ring beam 3 of the embodiment of the present application is provided with a reserved hole for penetrating a finished rolled threaded steel bar system 21, which facilitates the finished rolled threaded steel bar system 21 to penetrate through each layer of ring beam 3 in turn and be fixedly connected with the ring beam 3. Specifically, the finished rolled threaded steel bar system 21 can be fixedly connected with each layer of ring beam 3 through an anchor bolt or the like fastener to ensure the safety and stability of the ring beam 3 during the process of hanging and lowering.

[0077] In some optional embodiments, referring to Figs. 1 to 3 As shown in the figure, the embodiment of the present application provides a construction method of a deep-water bare rock cofferdam, and the ring beam 3 of the construction method of the deep-water bare rock cofferdam is in a rectangular shape, the inner side of the ring beam 3 is fixedly connected with a cross brace 31, the four corners of the ring beam 3 are fixedly connected with an inclined brace 32, and the ring beam 3 and / or the cross brace 31 and / or the inclined brace 32 are provided with a support 4.

[0078] The cross brace 31 and the inclined brace 32 of the embodiment of the present application can be provided with multiple ones to ensure the stability of the ring beam 3. Preferably, the support 4 can adopt a steel column and be welded on the cross brace 31 in advance, and then be spliced with the ring beam 3 on site to improve the construction efficiency.

[0079] In some optional embodiments, referring to Figs. 1 to 3 As shown in the figure, the embodiment of the present application provides a construction method of a deep-water bare rock cofferdam, and the inner side of the ring beam 3 of the construction method of the deep-water bare rock cofferdam is provided with a limiting frame 33 which is in mutual sliding connection with a steel casing 1.

[0080] The inner side of the ring beam 3 of the embodiment of the present application is provided with a limiting frame 33 which is in mutual sliding connection with a steel casing 1. By reasonably arranging multiple limiting frames 33 and cooperating with multiple steel casings 1, when the ring beam 3 is lowered, the limiting frame 33 slides on the surface of the steel casing 1, which can play a guiding role in lowering, and at the same time, reduce the amplitude of the shaking of the ring beam 3, and improve the safety during the process of lowering the ring beam 3.

[0081] In some optional embodiments, referring to Figs. 1 to 3 Figs. 1 to 3 As shown in the figure, the embodiment of the present application provides a construction method of a deep-water bare rock cofferdam, and the ring beam 3 is used as a guide to insert and drive a locking steel pipe pile 5, which specifically includes the following steps:

[0082] A guide frame is installed on the steel casing 1, and the locking steel pipe pile 5 is inserted and driven with the guide frame and the ring beam 3 as a guide;

[0083] The lock steel pipe pile 5 is inserted and driven to a preset depth, so that the bottom end of the lock steel pipe pile 5 is embedded in the rock layer.

[0084] The guide frame (not shown in the figure) of the embodiment of the present application is the prior art, which can be installed on the steel casing 1 and extended to the side of the circle beam 3, and can play a guiding role for the lock steel pipe pile 5 when the lock steel pipe pile 5 is inserted and driven, so as to avoid deviation of the insertion and driving direction of the lock steel pipe pile 5. Meanwhile, the guide frame can reduce the disturbance amplitude of the circle beam 3 when the lock steel pipe pile 5 is inserted and driven, and further improve the stability of the insertion and driving construction.

[0085] In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0086] It should be noted that in the present application, relational terms such as "first" and "second" and the like are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the sentence "including a" does not exclude the presence of other identical elements in the process, method, article or equipment including the element.

[0087] The above is only a specific embodiment of the present application, which enables those skilled in the art to understand or implement the present application. Various modifications of these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A construction method for a deep-water bare rock cofferdam, characterized in that... Includes the following steps: exist The ring beam (3) is assembled on the steel casing (1); A hanging system (2) is installed at the top of the steel casing (1), and the ring beam (3) is lowered to the preset position using the fine-rolled threaded steel bar system (21) in the hanging system (2); The ring beam (3) is supported on the rock strata by using multiple support members (4); Drive interlocking steel pipe piles (5) with the ring beam (3) as the guide; The method of supporting the ring beam (3) on the rock strata using multiple support members (4) specifically includes the following steps: The length of the support member (4) is determined by the vertical distance from the preset position of the ring beam (3) to the rock stratum; Before the ring beam (3) is lowered, multiple support members (4) are fixed on the ring beam (3) so that the multiple support members (4) are lowered synchronously with the ring beam (3).

2. The construction method of the deep-water bare rock cofferdam as described in claim 1, characterized in that: When the ring beam (3) is lowered to the preset position, if there is a gap between the support (4) and the rock layer, the gap is filled with pads (6).

3. The construction method of the deep-water bare rock cofferdam as described in claim 1, characterized in that: Assembling the ring beam (3) on the steel casing (1) specifically includes the following steps: Connect the high-strength steel casing (1), and weld multiple layers of brackets (7) from bottom to top on the steel casing (1). Assemble the ring beam (3) on each layer of brackets (7). The multi-layer ring beam (3) is connected into one piece using the connecting system (8).

4. The construction method of the deep-water bare rock cofferdam as described in claim 3, characterized in that: The method of lowering the ring beam (3) to the preset position using the fine-rolled threaded steel bar system (21) in the suspension system (2) includes the following steps: The fine-rolled threaded steel bar system (21) is anchored to the ring beam (3) using anchor bolts; Remove the bracket (7) and use the jack system (22) in the hoisting system (2) to lower the ring beam (3) as a whole to the preset position.

5. The construction method of the deep-water bare rock cofferdam as described in claim 3, characterized in that: Each ring beam (3) of each layer is provided with a reserved hole for inserting a fine-rolled threaded steel bar system (21). The fine-rolled threaded steel bar system (21) passes through each ring beam (3) in sequence and is fixedly connected to the ring beam (3).

6. The construction method of the deep-water bare rock cofferdam as described in claim 1, characterized in that: The ring beam (3) is rectangular in shape. A cross brace (31) is fixed on the inner side of the ring beam (3). An oblique brace (32) is fixed at the four corners of the ring beam (3). The support member (4) is provided on the ring beam (3) and / or the cross brace (31) and / or the oblique brace (32).

7. The construction method of a deep-water bare rock cofferdam as described in claim 1, characterized in that: The inner side of the ring beam (3) is provided with a limiting frame (33) that slides with the steel casing (1).

8. The construction method of a deep-water bare rock cofferdam as described in claim 1, characterized in that: The method of driving interlocking steel pipe piles (5) with the ring beam (3) as a guide specifically includes the following steps: Install a guide frame on the steel casing (1), and drive the locking steel pipe pile (5) with the guide frame and the ring beam (3) as guides. The locking steel pipe pile (5) is driven to a preset depth so that the bottom end of the locking steel pipe pile (5) is embedded in the rock layer.

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