Dismantling method of bridge underwater structure
By surrounding the steel structure cofferdam and oblique braces under the bridge, the underwater structure of the bridge was removed in sections, and the safety, noise pollution and high cost of underwater structure demolition during bridge construction was solved, and fast and safe underwater structure removal.
Patent Information
- Application Number
- CN202411338595.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-25
- Publication Date
- 2024-12-31
AI Technical Summary
The underwater structure demolition method during bridge construction has problems such as high risk, noise pollution, affecting the construction of waterways and bridge decks, and high costs.
Underwater enclosure forms a water barrier environment, stabilize the overall structure through the steel structure cofferdam, oblique brace and transverse brace, remove the underwater structure of the bridge in segments, avoid the impact of the water body environment, and use water stop measures to ensure construction safety and efficiency.
The rapid and safe dismantling of the underwater structure is achieved, the dangers and noise pollution of mechanical cutting and blasting are avoided, and the water pass and bridge deck construction is not affected, and the costs are reduced.
Smart Images
Figure CN119221395A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of bridge engineering, and more specifically, to a method for dismantling an underwater structure of a bridge. Background Art
[0002] During bridge construction, steel pipe piles are often driven underwater as temporary supports, and the piers are installed to form the construction surface. After the bridge construction is completed, the underwater structure of the bridge needs to be dismantled, and most of them are removed by mechanical cutting and demolition, blasting demolition, and pier column hoisting and pile pulling. Mechanical cutting and demolition requires underwater operations, which is very dangerous, and it is impossible to pull out the entire steel pipe pile. Blasting demolition generates noise and pollution, and will also affect the normal shipping of the waterway. Pier column hoisting and pile pulling requires the installation of the bridge deck structure and suspension structure on the bridge, which affects the normal operation of the bridge deck construction and is also costly. Therefore, this application solves the above technical problems. Summary of the invention
[0003] The present invention provides a method for dismantling an underwater structure of a bridge, which can enclose and form a water-proof environment and is not affected by the water environment, thereby facilitating the rapid dismantling of the underwater structure and improving construction efficiency and construction safety.
[0004] In order to achieve these purposes and other advantages according to the present invention, a method for dismantling an underwater structure of a bridge is provided, comprising the following steps: Step 1: After the above-water structure of the bridge is dismantled, a steel cofferdam is driven around the underwater structure of the bridge; Step 2: Install the four corner diagonal braces and symmetrically install the horizontal braces between the underwater structure of the bridge and the steel structure cofferdam; Step 3: Use water-stopping measures to pump out water and check whether the water-stopping effect is satisfactory; Step 4: Dismantle the underwater structure of the bridge in sections, remove the cross braces between the section being dismantled and the steel cofferdam, and at the same time install cross braces between the steel cofferdams on the opposite sides of the dismantled section to clear the bottom.
[0005] Preferably, step one comprises the following steps: S11: driving the steel panel piles in sequence, and connecting the steel panel piles with the connection blocks through the locking mouth: during construction, vertically hoisting the next steel panel pile until it is aligned with the locking mouth of the previous steel panel pile, vertically driving the next steel panel pile, and vertically driving the connection block, so that the connection block fits with the aligned locking mouth; S12: Insert and drive steel angle sheet piles, connect the steel angle sheet piles with mortise and tenon joints, and connect the steel angle sheet piles with steel panel piles through locking joints and connecting blocks: During construction, vertically lift the mortise steel angle sheet piles until they are aligned with the locking joints of the steel panel piles, vertically insert the mortise steel angle sheet piles, vertically drive the connecting blocks so that the connecting blocks fit with the aligned locking joints, and then vertically lift the tenon steel angle sheet piles until they are aligned with the insertion joints of the mortise steel angle sheet piles, vertically insert the tenon steel angle sheet piles so that the tenon steel angle sheet piles are connected with the mortise steel angle sheet piles.
[0006] Preferably, the locking opening is a T-shaped columnar opening, and the connecting block is an I-shaped columnar structure, and the insertion space formed after the locking openings are aligned matches the connecting block.
[0007] Preferably, the mortise steel angle sheet pile is provided with the locking opening on one side and with: A first connecting column, which is a trapezoidal column structure, wherein the first connecting column is equal in height to the mortise steel angle sheet pile, and the long bottom side is equal in width to the mortise steel angle sheet pile; The second connecting column is a square columnar structure, the height of the second connecting column is not higher than 2 / 3 of the bottom of the first connecting column, the second connecting column is equal to the short bottom side of the first connecting column and connected, and the second connecting column is also connected to the mortise steel angle sheet pile; The locking opening is provided on one side of the tenon steel angle sheet pile, and a notch structure cooperating with the first connecting column and the second connecting column of the mortise steel angle sheet pile is provided on the other side. The tenon steel angle sheet pile and the mortise steel angle sheet pile are assembled to form an L-shaped steel angle sheet.
[0008] Preferably, step 2 comprises the following steps: S21: installing diagonal braces between the tenon steel angle sheet piles and the mortise steel angle sheet piles, and the diagonal braces at four corners are arranged at equal heights; S22: Install cross braces symmetrically between the underwater bridge pier and the steel structure cofferdam on the same transverse section.
[0009] Preferably, step 4 comprises the following steps: S41: Remove the underwater bridge cap in sections from both ends to the middle. For the section being removed, remove a pair of cross braces first. For the section that has been removed, reinstall the cross braces between the opposite steel cofferdams in the transverse direction to avoid the pile foundation to be removed. S42: Pull out the pile foundation from both ends to the middle; S43: Clean up.
[0010] The present invention has at least the following beneficial effects: First, the present invention drives a steel structure cofferdam into the water body to form a water-proof environment, and the diagonal braces and transverse braces cooperate to stabilize the overall structural strength. After pumping out the water, the segmented demolition construction is carried out. Compared with mechanical cutting and breaking, the underwater structure can be removed as a whole. Compared with blasting demolition, it does not affect water traffic. Compared with pier hoisting and pile pulling demolition, it does not affect bridge deck construction. The method of the present invention is not affected by the water environment, facilitates the rapid demolition of the underwater structure, and improves construction efficiency and construction safety.
[0011] Second, during construction, a steel cofferdam is driven in within 2-3m around the underwater structure of the bridge to form a water-proof environment. The steel cofferdam can be made of steel panels, either single-layer or double-layer. The double-layer steel panels need to be installed with connecting plates to form a reinforcement structure. The steel cofferdam is preferably a square ring structure to facilitate the material collection and manufacture of the steel panels. Diagonal braces are installed at the four corners, and the two ends are respectively abutted against the steel panels at the corners. The installation height is multiple heights, the top is 1m away from the steel panel, and the adjacent diagonal braces are 1m apart to form a supporting structure. At the same time, horizontal braces are symmetrically installed between the underwater structure and the steel panel to strengthen the strength of the steel cofferdam. The water-stop structure can be made of water-stop strips. When the water-stop effect is qualified, the demolition operation can be carried out. During demolition, the upper outer underwater bridge pedestal is first demolished, and then the lower underwater bridge pile foundation is demolished. For the segment being demolished, the installed horizontal braces are first removed during demolition, and then the horizontal braces are installed in the segment that has been demolished to ensure the overall strength of the steel cofferdam and facilitate safe and rapid construction.
[0012] Third, the steel structure cofferdam is formed by the steel panel piles and steel angle sheet piles. The steel panel piles are provided with locking ports on both sides. The adjacent steel panel piles are aligned and spliced through the locking ports, and the connection is achieved by plugging in the connecting blocks. The shapes of the locking ports and the connecting blocks are matched to limit the relative movement in the horizontal and vertical directions. The steel panel piles are plugged in first, and then the connecting blocks are plugged in. This avoids the need for precise positioning before the traditional lock-and-lock plug-in form. The present invention only requires preliminary splicing and positioning before installing the connecting blocks. Connecting strips and waterstops can be added to the gaps. The steel angle sheet piles include tenon steel angle sheet piles and mortise steel angle sheet piles. One side of each is provided with a locking port, and the other side is provided with a tenon structure and a mortise structure. The mortise steel angle sheet piles are plugged in first, and then the tenon steel angle sheet piles are plugged in. After the splicing of the plugs, the relative movement in the horizontal and vertical directions can be limited.
[0013] Fourthly, a pair of locks are assembled to form an I-shaped structure, which cooperates with the connecting block to achieve effective connection between steel panel piles, or between steel panel piles and steel angle sheet piles. The other side of the mortise steel angle sheet pile is designed as a plug-in structure, and the other side of the tenon steel angle sheet pile is designed as a notch structure. The two cooperate to achieve effective connection between the steel angle sheet piles. Specifically, the other side of the mortise steel angle sheet pile is designed as a first connecting column, a second connecting column and the mortise steel angle sheet pile are integrally formed, the first connecting column and the second connecting column are flush with the bottom of the mortise steel angle sheet pile, the first connecting column is at the same height as the mortise steel angle sheet pile and is higher than the second connecting column, and the other side of the tenon steel angle sheet pile is designed to have a first notch and a second notch. The first notch and the second notch are flush with the bottom of the tenon steel angle sheet pile, the first notch is at the same height as the tenon steel angle sheet pile and is higher than the second notch. When plugging and driving, the integrated structure formed by the first notch and the second notch corresponds to the through notch formed by the first connecting column and the second connecting column. After assembly, the longitudinal movement of the tenon steel angle sheet pile is limited by the first connecting column of the mortise steel angle sheet pile, and the lateral movement of the tenon steel angle sheet pile is limited by the second connecting column of the mortise steel angle sheet pile.
[0014] Fifth, when installing diagonal braces, steel diagonal braces can be used, and pads can be added between them and the steel angle sheet piles to increase the contact area and improve the supporting effect. When installing horizontal braces, they should be installed on the opposite side of the underwater pier of the bridge. When dismantling, first dismantle the outer paired horizontal braces, and then dismantle the segments, such as cutting operations. After the segment is dismantled, install the horizontal braces again. When installing, reserve space for the removal of the pile foundation to avoid affecting the placement of the pile pulling equipment when the pile foundation is removed, which can further improve the safety of underwater operations.
[0015] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 A schematic diagram of the structure of a steel panel pile and a connecting block according to a technical solution of the present invention; Figure 2 A schematic diagram of the structure of a mortise steel angle sheet pile according to a technical solution of the present invention; Figure 3 A schematic structural diagram of a tenon steel angle sheet pile according to a technical solution of the present invention; Figure 4 A schematic diagram of the connection structure between steel panel piles according to a technical solution of the present invention Figure 5 The figure is a schematic diagram of the connection structure between the steel panel pile and the steel angle sheet pile according to a technical solution of the present invention. DETAILED DESCRIPTION
[0017] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.
[0018] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.
[0019] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials can be obtained from commercial sources unless otherwise specified; in the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected, set, or detachably connected, set, or connected and set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in specific circumstances. The orientation or position relationship indicated by the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.
[0020] The present invention provides a method for dismantling an underwater structure of a bridge, comprising the following steps: Step 1: After the above-water structure of the bridge is dismantled, a steel cofferdam is driven around the underwater structure of the bridge; Step 2: Install the four corner diagonal braces and symmetrically install the horizontal braces between the underwater structure of the bridge and the steel structure cofferdam; Step 3: Use water-stopping measures to pump out water and check whether the water-stopping effect is satisfactory; Step 4: Dismantle the underwater structure of the bridge in sections, remove the cross braces between the section being dismantled and the steel cofferdam, and at the same time install cross braces between the steel cofferdams on the opposite sides of the dismantled section to clear the bottom.
[0021] Preferably, step one comprises the following steps: S11: driving the steel panel piles 1 in sequence, and connecting the steel panel piles 1 with the connection blocks 3 through the locks 2: during construction, vertically hoisting the next steel panel pile 1 until it is aligned with the lock 2 of the previous steel panel pile 1, vertically driving the next steel panel pile 1, and vertically driving the connection blocks 3, so that the connection blocks 3 fit with the aligned locks 2; S12: Insert and drive steel angle sheet piles, which are connected by mortise and tenon joints, and the steel angle sheet piles are connected to the steel panel piles 1 by the locking joints 2 and the connecting blocks 3: During construction, the mortise steel angle sheet piles 4 are vertically lifted until they are aligned with the locking joints 2 of the steel panel piles 1, and then the mortise steel angle sheet piles 4 are vertically inserted, and the connecting blocks 3 are vertically inserted so that the connecting blocks 3 fit with the aligned locking joints 2. Then, the tenon steel angle sheet piles 7 are vertically lifted until they are aligned with the insertion joints of the mortise steel angle sheet piles 4, and then the tenon steel angle sheet piles 7 are vertically inserted so that the tenon steel angle sheet piles 7 are connected to the mortise steel angle sheet piles 4.
[0022] In the above technical scheme, a steel structure cofferdam is driven into the water body to form a water-proof environment, and the diagonal braces and transverse braces cooperate to stabilize the overall structural strength. After pumping out the water, the segmented demolition construction is carried out. Compared with mechanical cutting and breaking, the underwater structure can be removed as a whole. Compared with blasting demolition, it does not affect water traffic. Compared with pier hoisting and pile pulling demolition, it does not affect bridge deck construction. The method of the present invention is not affected by the water environment, facilitates the rapid demolition of the underwater structure, and improves construction efficiency and construction safety.
[0023] During construction, a steel structure cofferdam is driven in within 2-3m around the underwater structure of the bridge to form a water-proof environment. The steel structure cofferdam can be made of steel panels, either single-layer or double-layer. The double-layer steel panels need to be installed with connecting plates to form a reinforced structure. The steel structure cofferdam is preferably a square ring structure to facilitate the material collection and manufacture of the steel panels. Diagonal braces are installed at the four corners, and the two ends are respectively abutted against the steel panels at the corners. The installation height is multiple heights, the top is 1m away from the steel panel, and the adjacent diagonal braces are 1m apart to form a supporting structure. At the same time, horizontal braces are symmetrically installed between the underwater structure and the steel panel to strengthen the strength of the steel cofferdam. The water-stop structure can adopt a water-stop strip. The demolition operation can be carried out when the water-stop effect is qualified. During demolition, the upper outer underwater bridge pedestal is first demolished, and then the lower underwater bridge pile foundation is demolished. For the segment being demolished, the installed horizontal braces are first removed during demolition, and then the horizontal braces are installed in the segment that has been demolished to ensure the overall strength of the steel cofferdam and facilitate safe and rapid construction.
[0024] The steel structure cofferdam is formed by the steel panel pile 1 and the steel angle sheet pile. The two sides of the steel panel pile 1 are respectively provided with a lock 2. The adjacent steel panel piles 1 are aligned and spliced through the lock 2, and the connection is achieved by plugging in the connecting block 3. The shape of the lock 2 and the connecting block 3 is matched to limit the relative movement between the horizontal and vertical directions. The steel panel pile 1 is first inserted, and then the connecting block 3 is inserted. This avoids the need for precise positioning before the traditional lock lock 2 plug-in form. The present invention only needs preliminary splicing and positioning before installing the connecting block 3. Connecting strips and water stop strips can be added to the gap. The steel angle sheet pile includes a tenon steel angle sheet pile 7 and a mortise steel angle sheet pile 4. One side of each is provided with a lock 2, and the other side is provided with a tenon structure and a mortise structure. The mortise steel angle sheet pile 4 is first inserted, and then the tenon steel angle sheet pile 7 is inserted. After the splicing, the relative movement between the horizontal and vertical directions can be limited.
[0025] like Figures 1 to 5 As shown, in another technical solution, the locking opening 2 is a T-shaped columnar opening, and the connecting block 3 is an I-shaped columnar structure. The insertion space formed by aligning the locking openings 2 matches the connecting block 3. A pair of locking openings 2 are assembled to form an I-shaped structure, which cooperates with the connecting block 3 to achieve effective connection between steel panel piles 1, or between steel panel piles 1 and steel angle sheet piles.
[0026] like Figures 1 to 5 As shown, in another technical solution, the locking opening 2 is provided on one side of the mortise steel angle sheet pile 4, and the locking opening 2 is provided on the other side: A first connecting column 5, which is a trapezoidal column structure, wherein the first connecting column 5 is as high as the mortise steel angle sheet pile 4, and the long bottom side is as wide as the mortise steel angle sheet pile 4; The second connecting column 6 is a square columnar structure. The height of the second connecting column 6 is not higher than 2 / 3 of the bottom of the first connecting column 5. The second connecting column 6 is equal in width to the short bottom side of the first connecting column 5 and is connected to the second connecting column 6. The second connecting column 6 is also connected to the mortise steel angle sheet pile 4. The locking opening 2 is provided on one side of the tenon steel angle sheet pile 7, and a notch structure cooperating with the first connecting column 5 and the second connecting column 6 of the mortise steel angle sheet pile 4 is provided on the other side. The tenon steel angle sheet pile 7 and the mortise steel angle sheet pile 4 are assembled to form an L-shaped steel angle sheet.
[0027] In the above technical scheme, the other side of the mortise steel angle sheet pile 4 is designed as a plug-in structure, and the other side of the tenon steel angle sheet pile 7 is designed as a notch structure. The two are matched to achieve effective connection between the steel angle sheet piles. Specifically, the other side of the mortise steel angle sheet pile 4 is designed as a first connecting column 5, and the second connecting column 6 is integrally formed with the mortise steel angle sheet pile 4. The first connecting column 5, the second connecting column 6 and the bottom of the mortise steel angle sheet pile 4 are flush, the first connecting column 5 is at the same height as the mortise steel angle sheet pile 4 and is higher than the second connecting column 6. The other side of 7 is designed to have a first notch and a second notch. The first notch and the second notch are flush with the bottom of the tenon steel angle sheet pile 7. The first notch is at the same height as the tenon steel angle sheet pile 7 and is higher than the second notch. When inserted, the integrated structure formed by the first notch and the second notch corresponds to the through notch formed by the first connecting column 5 and the second connecting column 6. After assembly, the longitudinal movement of the tenon steel angle sheet pile 7 is restricted by the first connecting column 5 of the mortise steel angle sheet pile 4, and the lateral movement of the tenon steel angle sheet pile 7 is restricted by the second connecting column 6 of the mortise steel angle sheet pile 4.
[0028] In another technical solution, when installing the diagonal brace, a steel diagonal brace can be used, and a pad can be added between the diagonal brace and the steel angle sheet pile to increase the contact area and improve the support effect. When installing the horizontal brace, it is installed on the opposite side of the underwater pier of the bridge to improve the stability of the system. Step 2 includes the following steps: S21: installing diagonal braces between the tenon steel angle sheet pile 7 and the mortise steel angle sheet pile 4, and the diagonal braces at four corners are arranged at equal heights; S22: Install cross braces symmetrically between the underwater bridge pier and the steel structure cofferdam on the same transverse section.
[0029] In another technical solution, when dismantling, the outer paired cross braces are first dismantled, and then the segments are dismantled, such as by cutting. After the segments are dismantled, the cross braces are installed again. When installing, space is reserved for the removal of the pile foundation to avoid affecting the placement of the pile pulling equipment when the pile foundation is removed, which can further improve the safety of underwater operations. Step 4 includes the following steps: S41: Remove the underwater bridge cap in sections from both ends to the middle. For the section being removed, remove a pair of cross braces first. For the section that has been removed, reinstall the cross braces between the opposite steel cofferdams in the transverse direction to avoid the pile foundation to be removed. S42: Pull out the pile foundation from both ends to the middle; S43: Clean up.
[0030] The number of devices and processing scales described here are used to simplify the description of the present invention. Applications, modifications and variations of the present invention will be obvious to those skilled in the art.
[0031] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.
Claims
1. A method for dismantling an underwater bridge structure, characterized in that: The following steps are involved: Step 1: After the above-water structure of the bridge is dismantled, a steel cofferdam is driven around the underwater structure of the bridge; Step 2: Install the four corner diagonal braces and symmetrically install the horizontal braces between the underwater structure of the bridge and the steel structure cofferdam; Step 3: Use water-stopping measures to pump out water and check whether the water-stopping effect is satisfactory; Step 4: Dismantle the underwater structure of the bridge in sections, remove the cross braces between the section being dismantled and the steel cofferdam, and at the same time install cross braces between the steel cofferdams on the opposite sides of the dismantled section to clear the bottom.
2. The method for dismantling an underwater bridge structure according to claim 1, characterized in that: Step one includes the following steps: S11: driving the steel panel piles in sequence, and connecting the steel panel piles with the connection blocks through the locking mouth: during construction, vertically hoisting the next steel panel pile until it is aligned with the locking mouth of the previous steel panel pile, vertically driving the next steel panel pile, and vertically driving the connection block, so that the connection block fits with the aligned locking mouth; S12: Insert and drive steel angle sheet piles, connect the steel angle sheet piles with mortise and tenon joints, and connect the steel angle sheet piles with steel panel piles through locking joints and connecting blocks: During construction, vertically lift the mortise steel angle sheet piles until they are aligned with the locking joints of the steel panel piles, vertically insert the mortise steel angle sheet piles, vertically drive the connecting blocks so that the connecting blocks fit with the aligned locking joints, and then vertically lift the tenon steel angle sheet piles until they are aligned with the insertion joints of the mortise steel angle sheet piles, vertically insert the tenon steel angle sheet piles so that the tenon steel angle sheet piles are connected with the mortise steel angle sheet piles.
3. The method for dismantling an underwater bridge structure according to claim 2, characterized in that: The locking opening is a T-shaped columnar opening, and the connecting block is an I-shaped columnar structure. The insertion space formed after the locking openings are aligned matches the connecting block.
4. The method for dismantling an underwater bridge structure according to claim 2, characterized in that: The mortise steel angle sheet pile has a locking opening on one side and: A first connecting column, which is a trapezoidal column structure, wherein the first connecting column is equal in height to the mortise steel angle sheet pile, and the long bottom side is equal in width to the mortise steel angle sheet pile; The second connecting column is a square columnar structure, the height of the second connecting column is not higher than 2 / 3 of the bottom of the first connecting column, the second connecting column is equal to the short bottom side of the first connecting column and connected, and the second connecting column is also connected to the mortise steel angle sheet pile; The locking opening is provided on one side of the tenon steel angle sheet pile, and a notch structure cooperating with the first connecting column and the second connecting column of the mortise steel angle sheet pile is provided on the other side. The tenon steel angle sheet pile and the mortise steel angle sheet pile are assembled to form an L-shaped steel angle sheet.
5. The method for dismantling an underwater bridge structure according to claim 2, characterized in that: Step 2 includes the following steps: S21: installing diagonal braces between the tenon steel angle sheet piles and the mortise steel angle sheet piles, and the diagonal braces at four corners are arranged at equal heights; S22: Install cross braces symmetrically between the underwater bridge pier and the steel structure cofferdam on the same transverse section.
6. The method for dismantling an underwater bridge structure according to claim 5, characterized in that: Step 4 includes the following steps: S41: Remove the underwater bridge cap in sections from both ends to the middle. For the section being removed, remove a pair of cross braces first. For the section that has been removed, reinstall the cross braces between the opposite steel cofferdams in the transverse direction to avoid the pile foundation to be removed. S42: Pull out the pile foundation from both ends to the middle; S43: Clean up.