Steel casing assembled with corbels to stabilize steel casing cofferdam and construction method

Abstract

The present invention provides a steel casing assembled corbel stabilized steel casing cofferdam and construction method, including accurate processing of modular standardized cofferdams and accurate arrangement of reserved holes through computer-aided technology (BIM), temporary fixation technology for assembled corbels, rapid prestressed construction technology for upper and lower cofferdams, and adjustable steel support construction technology. The beneficial effect of the present invention is that the three-dimensional simulation method of BIM is used to determine the size of the cofferdam module and the reserved holes, etc., which greatly increases the accuracy of construction, reduces installation and adjustment at the construction site, and further improves construction efficiency and quality. The upper and lower cofferdams adopt a quick connection method of prestressed tendons and extruded waterproof strips, which saves a lot of welding content, improves construction efficiency and reduces construction difficulty. The steel support can realize horizontal rotation and vertical rotation, making the support installation adjustable, speeding up construction efficiency and reducing rework.

Description

Technical Field

[0001] The invention relates to the field of cofferdam construction, in particular to a steel casing assembled with corbels to stabilize a steel casing box cofferdam and a construction method. Background Art

[0002] In bridge wading projects, in order to create a dry working environment and avoid the influence of water flow, cofferdams are often used for construction. Cofferdams refer to structures used for temporary water retention in water conservancy projects to ensure that the project can be safely constructed on dry ground and will be dismantled after the construction is completed. Since steel box cofferdams can withstand greater water pressure and external wear and tear, and can be reused, they are widely used in the field of cofferdam construction.

[0003] However, the current cofferdam construction period is long, the project progress is slow, and there are many welding processes. Traditional cofferdam construction methods inevitably encounter these problems. Summary of the invention

[0004] The purpose of the present invention is to provide a steel casing assembled with corbels to stabilize a steel casing cofferdam and a construction method to solve the above-mentioned technical problems.

[0005] In order to solve the above technical problems, the present invention provides a construction method for assembling steel casing with corbels to stabilize steel casing cofferdam, comprising the following steps:

[0006] Step 1: Design the cofferdam straight section module, cofferdam corner section module and connection module, and open the top cavity for prestressed tendon construction and the bottom cavity for prestressed tendon construction in the connection module, and reserve prestressed tendon channels and reserved hole embedded parts in the top cavity for prestressed tendon construction and the bottom cavity for prestressed tendon construction;

[0007] Step 2: Raw materials and cofferdam straight section modules, cofferdam corner section modules, and connection modules are brought into the site;

[0008] Step 3: Use high-strength bolts to assemble the brackets on several steel casings for preliminary positioning and installation;

[0009] Step 4: Synchronously assemble a number of cofferdam straight section modules, cofferdam corner section modules, and connection modules on the assembled corbels to form a lower cofferdam;

[0010] Step 5: Connect the high steel casing, install the shoulder beam and the hanging, remove the assembled corbels, lower the lower cofferdam, and assemble the upper cofferdam according to the method in step 4 when the lower cofferdam reaches the self-floating state, so that the lower cofferdam supports the upper cofferdam, and place an extruded water stop strip between the same section of the upper and lower cofferdams;

[0011] Step 6: Pour water into the cofferdam wall formed by the upper and lower cofferdams, so that the upper and lower cofferdams sink to the bottom, and then pour the bottom plate concrete in the cofferdam wall;

[0012] Step seven: gradually pump out water and install steel supports layer by layer. Connect the ends of the steel supports through hinged plates so that the steel supports can be rotated and adjusted in the horizontal direction through the hinged plates. The hinged plates at the ends of the steel supports are threadedly matched with the screws so that the steel supports can be moved and adjusted in the vertical direction through the screws, and finally the cofferdam construction is completed.

[0013] The beneficial effects of the present invention are:

[0014] (1) Accurately designing the cofferdam module size and reserved holes greatly increases the construction accuracy and reduces installation adjustments at the construction site, further improving construction efficiency and quality.

[0015] (2) The upper and lower cofferdams adopt a quick connection method of prestressed reinforcement and extruded waterproof strips, which saves a lot of welding content, improves construction efficiency and reduces construction difficulty.

[0016] (3) The steel support adopts a hinged plate to realize horizontal rotation to achieve horizontal fine-tuning, while the lead screw can ensure its vertical rotation. Each rotation can make the fixed plate rise or fall a certain distance, making the support installation adjustable, speeding up construction efficiency and reducing rework. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A three-dimensional diagram of the lower cofferdam of the present invention;

[0018] Figure 2 A three-dimensional diagram of the upper cofferdam of the present invention;

[0019] Figure 3 It is a three-dimensional diagram of the details of the steel support device of the present invention;

[0020] Figure 4 It is a three-dimensional diagram of the complete cofferdam of the present invention;

[0021] Figure 5 It is the construction flow chart of the present invention;

[0022] Among them: 1-straight section module of cofferdam; 2-corner section module of cofferdam; 3-connection module; 4-top cavity for prestressed tendon construction; 5-bottom cavity for prestressed tendon construction; 6-reserved prestressed tendon channel; 7-extruded waterproof strip; 8-prestressed tendon; 9-steel casing; 10-assembled corbel; 11-high-strength bolt; 12-steel support; 13-hinged plate; 14-fixed plate; 15-bolt; 16-screw; 17-lower cofferdam; 18-upper cofferdam. DETAILED DESCRIPTION

[0023] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0024] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0025] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0026] like Figure 1-Figure 5 The present invention provides a construction method for assembling steel casing with corbels to stabilize steel casing cofferdam, comprising the following steps:

[0027] Step 1: Use computer-aided technology (BIM) to accurately design the cofferdam straight section module 1, cofferdam corner section module 2, and connection module 3 according to design requirements, and open a top cavity 4 for prestressed tendon construction and a bottom cavity 5 for prestressed tendon construction in the connection module 3. Reserve prestressed tendon channels 6 and reserved hole embedded parts in the top cavity 4 for prestressed tendon construction and the bottom cavity 5 for prestressed tendon construction. Perform parameter settings through BIM to quickly generate drawings required for processing, and extract processing data with one click to carry out modular standardized production;

[0028] Among them, the top cavity 4 for prestressed tendon construction has at least four reserved prestressed tendon channels 6 at the top, and the bottom cavity 5 for prestressed tendon construction has at least four reserved prestressed tendon channels 6 at the bottom.

[0029] Specifically, the connection module 3 is used to connect the cofferdam straight section module 1 and the cofferdam corner section module 2.

[0030] Step 2: Raw materials and cofferdam modules are brought in, and construction machinery and tools are ready;

[0031] Step 3: Use high-strength bolts 11 to assemble the brackets 10 on several steel casings 9 for preliminary positioning and installation, and then use welding to reinforce the assembled brackets 10;

[0032] Among them, at least two assembled corbels 10 are arranged at the corner steel casing 9, and the two adjacent assembled corbels 10 are arranged at an angle of 90°, so that the corner steel casing 9 supports the cofferdam corner section module 2 through at least two assembled corbels 10, and at least one assembled corbel 10 is arranged at the edge steel casing 9, and when several steel casings 9 are stacked, several assembled corbels 10 are facing outward.

[0033] Step 4: assemble several cofferdam straight section modules 1, cofferdam corner section modules 2, and connecting modules 3 on the assembled corbels 10 to form a lower cofferdam 17 to ensure balanced force and reduce the possibility of overturning, and enclose the lower cofferdam 17 through one of the connecting modules 3;

[0034] Among them, several cofferdam straight section modules 1, cofferdam corner section modules 2, and connecting modules 3 can be assembled synchronously in a clockwise or counterclockwise direction or in a clockwise and counterclockwise direction, and the lower cofferdam 17 is assembled to the final enclosed position through one of the connecting modules 3, so that the cofferdam straight section modules 1 or cofferdam corner section modules 2 on both sides of the final enclosed position can be spliced ​​and ensured by the connecting module 3.

[0035] Step 5, connect the high steel casing 9, install the shoulder beam and the hanging, remove the assembled corbel 10, lower the lower cofferdam 17, and assemble the upper cofferdam 18 according to the method in step 4 when the lower cofferdam 17 reaches the self-floating state, so that the lower cofferdam 17 supports the upper cofferdam 18, and place the extruded water stop strip 7 between the same section of the cofferdams of the upper and lower cofferdams, and the extruded water stop strip 7 is distributed on the inner and outer sides of the connection between the upper and lower cofferdams, while avoiding the prestressed tendon channel 6, so that the extruded water stop strip 7 and the upper surface of the lower cofferdam 17 are flat and close to each other, and are coated with neutral silicone structural adhesive for further bonding to avoid inaccurate positioning of the extruded water stop strip 7; two groups of workers simultaneously construct the top cavity 4 of the prestressed tendon of the lower cofferdam 17 The prestressed tendons 8 are tensioned in the bottom cavity 5 of the prestressed tendons of the upper cofferdam 18, so that a plurality of prestressed tendons 8 connect the lower cofferdam 17 and the upper cofferdam 18, and the upper and lower cofferdams are quickly connected and sealed by the prestressed tendons tightly squeezing the extrusion waterproof strip 7. The specific steps are to install the prestressed tendons 8 according to the reserved prestressed tendon channels 6 of the cofferdam, and the end of the prestressed tendons 8 located in the top cavity 4 of the prestressed tendons construction is used as the fixed end, and the end of the prestressed tendons 8 located in the bottom cavity 5 of the prestressed tendons construction is tensioned on one side, and the tensioning is controlled by a jack. Before construction, the structure should be stress-checked, and after construction, the deformation should be compared with the theoretical value to detect whether the deformation meets the requirements;

[0036] Among them, the lower cofferdam 17 and the upper cofferdam 18 both include four cofferdam straight section modules 1, four cofferdam corner section modules 2, and eight connection modules 3; and the connection module 3 in the lower cofferdam 17 includes a top cavity 4 for prestressed tendon construction, and the connection module 3 in the upper cofferdam 18 includes a bottom cavity 5 for prestressed tendon construction.

[0037] Specifically, placing an extruded waterstop strip 7 between the same section of the upper and lower cofferdams means placing an extruded waterstop strip 7 between the corresponding cofferdam straight section modules 1, cofferdam corner section modules 2 and connecting modules 3 in the upper and lower cofferdams, and effective waterproofing is achieved by extruding and coordinating the extruded waterstop strip 7 between the upper and lower cofferdams.

[0038] It is worth mentioning that the connecting module 3 with the top cavity 4 for prestressed tendon construction is used for splicing the lower cofferdam 17, and the connecting module 3 with the bottom cavity 5 for prestressed tendon construction is used for splicing the upper cofferdam 18, so that the top cavity 4 for prestressed tendon construction and the bottom cavity 5 for prestressed tendon construction are arranged close to each other, and the prestressed tendons 8 are sequentially passed through the prestressed tendon channels 6 in the upper and lower cofferdams.

[0039] Step 6: Pour water into the cofferdam wall formed by the upper and lower cofferdams, so that the upper and lower cofferdams sink to the bottom, and then pour the bottom plate concrete in the cofferdam wall;

[0040] Step seven, gradually pump out water and install steel supports 12 layer by layer, connect the ends of the steel supports 12 through the hinged plates 13, so that the steel supports 12 can be adjusted for rotation in the horizontal direction through the hinged plates 13, and threadedly engage with the hinged plates 13 at the ends of the steel supports 12 through the screw 16, so that the steel supports 12 can be adjusted for movement in the vertical direction through the screw 16, thereby preventing certain rework due to errors, completing the support construction quickly and accurately, and finally completing the cofferdam construction.

[0041] Among them, both ends of the steel support 12 are provided with a fixing plate 14, and the fixing plate 14 is connected to the two sides of the cofferdam corner section module 2 by bolts 15, so that a triangular support structure is formed between the cofferdam corner section module 2 and the steel support 12, and at the same time, hinged plates 13 are arranged at the ends of the steel support 12 and the sides of the fixing plate 14, and a lead screw 16 is connected between the two hinged plates 13, and the hinged plate 13 at the end of the steel support 12 is threadedly matched with the lead screw 16, and the hinged plate 13 on the side of the fixing plate 14 is rotationally matched with the lead screw 16, so that when the two hinged plates 13 are rotated relative to the lead screw 16, the horizontal and vertical directions of the steel support 12 can be adjusted respectively.

[0042] The invention also discloses a steel casing assembled with corbels to stabilize a steel casing box cofferdam, which is constructed according to the above-mentioned construction method of assembling steel casing with corbels to stabilize a steel casing box cofferdam.

[0043] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present invention.

Claims

1. A construction method for assembling steel casing and corbels to stabilize steel casing cofferdam, characterized in that: The following steps are involved: Step 1: designing the cofferdam straight section module (1), the cofferdam corner section module (2), and the connection module (3), and opening a prestressed tendon construction top cavity (4) and a prestressed tendon construction bottom cavity (5) in the connection module (3), and reserving a prestressed tendon duct (6) and reserved hole embedded parts in the prestressed tendon construction top cavity (4) and the prestressed tendon construction bottom cavity (5); Step 2: Raw materials and cofferdam straight section module (1), cofferdam corner section module (2), and connection module (3) are brought into the site; Step 3: Use high-strength bolts (11) to assemble the brackets (10) on a plurality of steel casings (9) for preliminary positioning and installation; Step 4: assemble a plurality of cofferdam straight section modules (1), cofferdam corner section modules (2), and connection modules (3) simultaneously on the assembly corbels (10) to form a lower cofferdam (17); Step 5: connect the high steel casing (9), install the shoulder beam and the hanging, remove the assembled corbel (10), lower the lower cofferdam (17), and assemble the upper cofferdam (18) according to the method of step 4 when the lower cofferdam (17) reaches a self-floating state, so that the lower cofferdam (17) supports the upper cofferdam (18), and place an extruded water stop strip (7) between the same section of the upper and lower cofferdams; Step 6: Pour water into the cofferdam wall formed by the upper and lower cofferdams, so that the upper and lower cofferdams sink to the bottom, and then pour the bottom plate concrete in the cofferdam wall; Step 7: gradually pump out water and install the steel support (12) layer by layer, connect the end of the steel support (12) through the hinge plate (13), so that the steel support (12) can be adjusted by rotating in the horizontal direction through the hinge plate (13), and the hinge plate (13) at the end of the steel support (12) is threadedly matched with the lead screw (16), so that the steel support (12) can be adjusted by moving in the vertical direction through the lead screw (16), and finally complete the cofferdam construction.

2. The construction method of assembling steel casing and corbels to stabilize steel casing cofferdam according to claim 1 is characterized by: In step three, at least two assembled corbels (10) are arranged at the corner steel casing (9), and the two adjacent assembled corbels (10) are arranged at an angle of 90 degrees, at least one assembled corbel (10) is arranged at the edge steel casing (9), and when a plurality of steel casings (9) are piled up, the plurality of assembled corbels (10) are all facing outwards.

3. The construction method of assembling steel casing and corbels to stabilize steel casing cofferdam according to claim 1 is characterized in that: In step 4, a plurality of cofferdam straight section modules (1), cofferdam corner section modules (2), and connection modules (3) are assembled synchronously in a clockwise or counterclockwise direction or in both clockwise and counterclockwise directions, and the lower cofferdam (17) is assembled to the final enclosed position through one of the connection modules (3).

4. The construction method of assembling steel casing and corbels to stabilize steel casing cofferdam according to claim 1 is characterized in that: In step five, the extruded water stop strip (7) is distributed on both sides of the inner and outer sides of the connection between the upper and lower cofferdams, avoiding the prestressed tendon channel (6), and the extruded water stop strip (7) is flat and tightly attached to the upper surface of the lower cofferdam (17) and coated with neutral silicone structural adhesive for further bonding.

5. The construction method of assembling steel casing and corbels to stabilize steel casing cofferdam according to claim 1 is characterized by: In step five, tensioning of prestressed tendons (8) is performed simultaneously in the top cavity (4) of the prestressed tendon construction of the lower cofferdam (17) and the bottom cavity (5) of the prestressed tendon construction of the upper cofferdam (18), so that a plurality of prestressed tendons (8) connect the lower cofferdam (17) and the upper cofferdam (18); wherein the end of the prestressed tendon (8) located in the top cavity (4) of the prestressed tendon construction serves as a fixed end, and the end of the prestressed tendon (8) located in the bottom cavity (5) of the prestressed tendon construction is tensioned on one side.

6. The construction method of assembling steel casing and corbels to stabilize steel casing cofferdam according to claim 5 is characterized by: In step five, the prestressed tendons (8) are sequentially inserted through the prestressed tendon channels (6) in the upper and lower cofferdams.

7. The construction method of assembling steel casing and corbels to stabilize steel casing cofferdam according to claim 1 is characterized by: In step seven, both ends of the steel support (12) have fixing plates (14), and the fixing plates (14) are connected to both sides of the cofferdam corner section module (2) by bolts (15) to form a triangular support structure between the cofferdam corner section module (2) and the steel support (12).

8. The construction method of assembling steel casing and corbels to stabilize steel casing cofferdam according to claim 7 is characterized by: The end of the steel support (12) and the side of the fixed plate (14) are both provided with hinged plates (13), a lead screw (16) is connected between the two hinged plates (13), and the hinged plate (13) at the end of the steel support (12) is threadedly matched with the lead screw (16), and the hinged plate (13) at the side of the fixed plate (14) is rotationally matched with the lead screw (16).

9. A steel casing assembled with corbels to stabilize a steel casing cofferdam, characterized in that: It is obtained by the construction method of assembling steel casing with corbels to stabilize steel casing cofferdam according to any one of claims 1 to 8.

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