Underwater bottom sealing concrete construction method for deepwater cofferdam

Abstract

The invention relates to the technical field of underwater bottom sealing construction of engineering construction, and discloses a deepwater cofferdam underwater bottom sealing concrete construction method which comprises the following steps: determining a riverbed elevation, establishing a riverbed elevation model, and marking a valley on a riverbed; a pouring frame is erected, the pouring frame comprises a main beam and a movable beam, the movable beam is vertically arranged on the main beam in a sliding mode, an installation block is further arranged on the movable beam in a sliding mode, and a pouring pipe is arranged on the installation block; the step of pouring and moving the beam comprises primary pouring and secondary pouring, the primary pouring is used for filling and leveling a valley area on the riverbed, and the secondary pouring comprises the step of continuously pouring on the filled and leveled riverbed to a preset thickness. The technical scheme has the beneficial effects that the built pouring frame enables the displacement of the pouring pipe to be more flexible and comprehensive, so that the pouring pipe can cover the whole riverbed more conveniently. The low ebb area of the riverbed can be filled and leveled up through primary pouring, the speed and quality during secondary pouring can be improved, and the thickness formed during secondary pouring is more uniform.

Description

Technical Field

[0001] The present invention relates to the technical field of underwater bottom sealing construction, and specifically relates to a construction method for underwater bottom sealing concrete of a deep-water cofferdam. Background Art

[0002] Bottom sealing of the cofferdam is a key link in water conservancy projects and the construction of deep-water foundations of bridges. Its main function is to form a water-stop layer by pouring concrete, providing a water-free working environment for subsequent construction of the bearing platform. During construction, first, the cofferdam is erected, and then a continuous sealing layer is formed by the bottom sealing concrete to block the seepage of water inside and outside the cofferdam, creating conditions for pumping water from the foundation pit. The bottom sealing layer can evenly transfer the load to the foundation, preventing the foundation soil from bulging or piping after pumping water.

[0003] The existing bottom sealing construction method requires the cooperation of multiple truck-mounted concrete pumps to optimize the pouring route and move between different positions. This pouring method requires mobilization of many units and is not convenient for positioning. It is easy to cause the problem of uneven bottom sealing pouring on riverbeds with peak and valley areas. Summary of the Invention

[0004] Aiming at the defects in the prior art, the present invention provides a construction method for underwater bottom sealing concrete of a deep-water cofferdam, which can perform fixed-point pouring on valley areas to ensure a flat bottom seal, and is provided with a pouring frame that is convenient for walking, making the pouring more convenient.

[0005] A technical solution provided by the present invention is: a construction method for underwater bottom sealing concrete of a deep-water cofferdam, including:

[0006] Determine the riverbed elevation. Through underwater measurement, establish a riverbed elevation model, and mark the peaks and valleys on the riverbed;

[0007] Erect a pouring frame. The pouring frame includes a main beam and a moving beam. The moving beam is vertically and slidably arranged on the main beam. An installation block is also slidably arranged on the moving beam, and a pouring pipe is arranged on the installation block;

[0008] Pouring. The moving beam includes primary pouring and secondary pouring. The primary pouring is used to fill the valley areas on the riverbed, and the secondary pouring includes continuing to pour on the filled riverbed to a predetermined thickness.

[0009] The beneficial effects of the above technical solution are: The erected pouring frame makes the movement of the pouring pipe more flexible and comprehensive, enabling the pouring pipe to cover the entire riverbed more conveniently. The primary pouring can fill the valley areas of the riverbed, improving the speed and quality during the second pouring, and making the thickness formed during the second pouring more uniform.

[0010] Furthermore, establishing a riverbed elevation model includes determining the riverbed reference height, which is the average of the height values at different points. The riverbed reference height is the basic height of the largest riverbed area to be faced during pouring. Determining the riverbed reference height by taking the average can accurately divide the peak and trough areas, and thus play a guiding role in subsequent pouring operations.

[0011] Furthermore, the marking includes establishing a plane coordinate system and calibrating the positions of the peaks and troughs in the coordinate system.

[0012] Furthermore, the pouring pipe is connected to a concrete supply system. The secondary pouring includes the pouring pipe moving in a loop around the cofferdam under the drive of the installation block, gradually approaching the center from the outside until the riverbed is completely covered.

[0013] Furthermore, the main beam includes two walking rails arranged on both sides of the cofferdam along the length direction of the cofferdam. The moving beam includes a pair of driving parts respectively movably arranged on the two walking rails, and a cable connected to the installation block is erected between the two driving parts.

[0014] Furthermore, a cross-moving component for driving the cable is also arranged on the driving part. The cross-moving component includes two winches, which are respectively arranged on both sides of the cofferdam.

[0015] Furthermore, the walking rail includes a support frame and a slide rail. The slide rail includes two rail bars arranged at intervals and in parallel. The driving part is provided with rollers connected to the slide rail. The support frame is also provided with a rack between the two rail bars, and the driving part is provided with a driving gear meshing with the rack. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0017] Figure 1 It is a schematic diagram of the construction in the embodiment of the present invention.

[0018] Reference numerals: Cofferdam 100, Walking rail 200, Rail bar 210, Rack 220, Driving part 300, Winch 310, Cable 320, Installation block 400, Hoop 410. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following will describe in detail the embodiments of the technical solutions of the present invention in conjunction with the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention, so they are only examples and cannot be used to limit the protection scope of the present invention.

[0020] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application shall have the ordinary meanings understood by those skilled in the art to which the present invention pertains.

[0021] As Figure 1 shown, this embodiment provides a construction method for underwater blinding concrete of a deep-water cofferdam, including: determining the riverbed elevation, establishing a riverbed elevation model through underwater measurement, marking the peaks and valleys on the riverbed. The elevation model can be a three-dimensional data model, which is convenient for operators to master the situation of the riverbed. During operation, divers can be used to dive to the riverbed for measurement, or machine equipment such as underwater sonar can be used for measurement. Erecting a pouring frame, the pouring frame includes a main beam and a moving beam. The moving beam is vertically and slidably arranged on the main beam, and an installation block 400 is also slidably arranged on the moving beam. A pouring pipe is arranged on the installation block 400; the installation block 400 can be self-equipped with a driving part 300, and the installation block 400 is driven to move on the moving beam by the driving part 300. Or there is an action part on the moving beam for driving the installation block 400, and the installation block 400 moves synchronously under the movement of the action part. Pouring, the moving beam includes primary pouring and secondary pouring. The primary pouring is used to fill the low-lying areas on the riverbed, and the secondary pouring includes continuing to pour on the filled riverbed to a predetermined thickness. The primary pouring mainly pours on the areas marked as low valleys in the elevation model, and the influence of the low-lying areas does not need to be considered during the secondary pouring. The installation block 400 and the pouring pipe are connected in a detachable manner. When the pouring pipe is fixed on the installation block 400, the installation block 400 can drive the pouring pipe to move. Specifically, a hoop 410 can be arranged on the installation block 400 to fix the pouring pipe.

[0022] The erected pouring frame makes the movement position of the pouring pipe more flexible and comprehensive, enabling the pouring pipe to more conveniently cover the entire riverbed. The primary pouring can fill the low-lying areas of the riverbed, improve the speed and quality during the second pouring, and make the thickness formed during the second pouring more uniform.

[0023] In some embodiments, establishing the riverbed elevation model includes determining the riverbed reference height, and the riverbed reference height is the average value of the height values at different points. The reference height of the riverbed is the basic height of the largest riverbed range faced during pouring. By determining the riverbed reference height in the way of average value, the peak and valley areas can be accurately divided. It can also play a guiding role in the subsequent pouring operation. Specifically, the number of points to be selected is determined according to the area of the riverbed. For example, one point is selected for every 100 ㎡. The data of all the selected points are calculated to obtain the average value of the height.

[0024] In some embodiments, marking includes establishing a plane coordinate system, and calibrating the positions of peaks and troughs in the coordinate system. Establishing a plane coordinate system can more intuitively correspond the position of the trough to the position of the pouring pipe, so that the pouring pipe can accurately find the trough area for filling and pouring. Specifically, the length direction of the cofferdam 100 can be the X direction, the width direction of the cofferdam 100 can be the Y direction, the cofferdam 100 is in the first quadrant as a whole, and the origin of the plane coordinate system coincides with a corner of the cofferdam 100. When marking, the trough area can be marked in sequence as: trough 1 (X1, Y1), trough 2 (X2, Y2), trough 3 (X3, Y3), trough 4 (X4, Y4)... During the initial pouring, all trough coordinate points can be poured along a Z-shaped route, or along a U-shaped route.

[0025] In some embodiments, the pouring pipe is connected to a concrete supply system, and the secondary pouring includes the pouring pipe moving in a U-shaped pattern around the cofferdam 100 under the drive of the mounting block 400, gradually approaching from the outside to the center until the riverbed is completely covered. The U-shaped movement can avoid missing the area to be poured, and can also ensure that the concrete poured on the riverbed can be tightly connected, thereby ensuring that the overall quality after pouring can meet the standards without generating gaps.

[0026] In some embodiments, the main beam includes two running rails 200 arranged on both sides of the cofferdam 100 along the length direction of the cofferdam 100, and the mobile beam includes a pair of driving parts 300 that are respectively movable and arranged on the two running rails 200, and a cable 320 connected to the mounting block 400 is set up between the two driving parts 300. The running rail 200 can be erected by a steel beam, and the steel beam includes a support frame and a slide rail. The support frame can be erected on site and can be assembled in a segmented splicing manner. The slide rail is fixed on the top of the support frame, and the slide rails on both sides of the cofferdam 100 are arranged in parallel. The driving part 300 is slidably matched with the slide rail, and the driving part 300 has a power component, preferably a motor or an internal combustion engine, and a running wheel is driven by the power component, and the running wheel and the slide rail are in contact with each other. The power component drives the running wheel to rotate, and the driving part 300 can reciprocate on the slide rail. In order to more conveniently control the travel speed and travel amount of the driving part 300, the friction between the running wheel and the slide rail can be replaced by the meshing of the driving gear and the rack 220. Specifically, a full-length rack 220 is provided at the bottom of the side of the slide rail, and a driving gear meshing with the rack 220 is installed on the driving unit 300, and the driving gear is in transmission connection with the power component, so that the driving unit 300 can determine the moving distance by the number of rotations of the driving gear.

[0027] Further, a cross - translation member for driving the movement of the cable 320 is provided on the driving part 300. The cross - translation member includes two winches 310, and the two winches 310 are respectively arranged on both sides of the cofferdam 100. The winch 310 is driven by a power member, and the cable 320 is fixedly connected to the mounting block 400. During movement, the movement directions of the two winches 310 on both sides are opposite, but they cannot take in or release the cable simultaneously on both sides. Instead, one side takes in the cable while the other side releases the cable, and the mounting block 400 will move towards the side that takes in the cable.

[0028] In some embodiments, each slide rail may be composed of two spaced - apart and parallel rail bars 210. The rack 220 is installed between the two rail bars 210 and is in an upward state. The driving part 300 includes a frame. The driving gear is installed in the middle of the bottom of the frame and meshes with the rack 220. The power component is fixed in the middle of the frame, and a connected speed reducer is arranged between the power component and the driving gear. At the bottom of the frame, rollers that are in rolling contact with the rail bars 210 are also provided. To increase the stability of the movement of the driving part 300, there are a total of four rollers in two pairs, and each pair of rollers is connected by a wheel axle. The two pairs of rollers are arranged front - to - back at the bottom of the frame.

[0029] Specifically, the movement of the driving part 300 on the slide rail is a movement in the X - direction, and the movement of the cable 320 driving the mounting block 400 is a movement in the Y - direction. Specifically, if the coordinates of the trough 1 are (10m, 10m), then the driving part 300 needs to move 10m in the X - direction from the origin, and the mounting block 400 moves 10m in the Y - direction. When in use, the movement in the X - direction and the movement in the Y - direction can be carried out step by step. For example, the movement in the X - direction can be carried out first, and then the movement in the Y - direction, or the movement in the Y - direction can be carried out first and then the movement in the X - direction. To save time and achieve the optimal path, the X and Y directions can also be moved simultaneously, so that the mounting block 400 can move along the shortest connection line between the origin and the trough 1.

[0030] In the description of the present application, it should be understood that the terms in the present application are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. In the description of the present invention, the meaning of "a plurality" is more than two, unless otherwise specifically and clearly defined.

[0031] In the present application, unless otherwise clearly specified and limited, terms such as "connected", "connected to", "fixed" and other terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above - mentioned terms in the present invention can be understood according to specific circumstances.

[0032] In the description of the present invention, a large number of specific details are set forth. However, it is understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, systems, and technologies have not been shown in detail so as not to obscure the understanding of this description.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered by the scope of the claims and the description of the present invention.

Claims

1. A construction method for underwater bottom-sealing concrete of a deep-water cofferdam, characterized in that Including: Determine the riverbed elevation. Through underwater measurement, establish a riverbed elevation model, and mark the peaks and valleys on the riverbed. Erect a pouring frame. The pouring frame includes a main beam and a moving beam. The moving beam is vertically and slidably arranged on the main beam. An installation block (400) is also slidably arranged on the moving beam, and a pouring pipe is arranged on the installation block (400). Pouring. The moving beam includes primary pouring and secondary pouring. The primary pouring is used to fill the low-lying areas on the riverbed, and the secondary pouring includes continuing to pour on the filled riverbed to a predetermined thickness.

2. The construction method of underwater blinding concrete for a deep-water cofferdam according to claim 1, characterized in that, The establishment of the riverbed elevation model includes determining the riverbed reference height, and the riverbed reference height is the average value of the height values at different points.

3. A method for constructing underwater blinding concrete of a deep-water cofferdam according to claim 1, characterized in that The marking includes establishing a plane coordinate system and calibrating the positions of the peaks and valleys in the coordinate system.

4. The construction method of underwater bottom sealing concrete for a deep-water cofferdam according to claim 1, wherein, The pouring pipe is connected to a concrete supply system. The secondary pouring includes the pouring pipe moving in a loop around the cofferdam (100) driven by the installation block (400), gradually approaching the center from the outside until the entire riverbed is completely covered.

5. A construction method for underwater bottom sealing concrete of a deep-water cofferdam according to claim 1, characterized in that, The main beam includes two walking rails (200) arranged on both sides of the cofferdam (100) along the length direction of the cofferdam (100). The moving beam includes a pair of driving parts (300) respectively movably arranged on the two walking rails (200). A cable (320) connected to the installation block (400) is erected between the two driving parts (300).

6. A construction method for underwater bottom sealing concrete of a deep-water cofferdam according to claim 5, characterized in that, A transverse movement component for driving the cable (320) is also arranged on the driving part (300). The transverse movement component includes two winches (310), and the two winches (310) are respectively arranged on both sides of the cofferdam (100).

7. A construction method for underwater bottom-sealing concrete of a deep-water cofferdam according to claim 5, characterized in that, The walking rail (200) includes a support frame and a slide rail. The slide rail includes two spaced and parallel rail bars (210). The driving part (300) is provided with rollers in contact with the slide rail. The support frame is also provided with a rack (220) between the two rail bars (210), and the driving part (300) is provided with a driving gear meshing with the rack (220).

Images