A method for dismantling and rebuilding a medium-to-large aqueduct

Abstract

The present invention discloses a method for dismantling and rebuilding a medium-to-large-sized aqueduct body. The method comprises the following steps: firstly, a rope saw is used to dismantle one span of the old aqueduct body to provide access space for a tire-type gantry crane; then, the dismantled old aqueduct bodies of multiple spans are hoisted one by one to a dismantling plant, thereby realizing rapid dismantling of the old aqueduct body and improving dismantling efficiency. In addition, during the dismantling process, an aqueduct prefabrication plant is set up near the construction site, and the construction period is further ensured by the prefabricated aqueduct body. The hoisting of the new aqueduct prefabricated parts is realized by two gantry cranes that can move and turn independently, thus solving the problem that the operation space for dismantling and rebuilding aqueducts with large spans is limited and rapid construction is difficult in the past, thereby realizing the mechanized operation of the aqueduct dismantling and reconstruction project, thereby not only ensuring construction quality and safety, but also reducing the impact on the surrounding environment, reducing the workload of demolition and relocation, saving project investment, and greatly improving construction efficiency.

Description

Technical Field

[0001] The present invention relates to the field of demolition and reconstruction of existing aqueducts, and in particular to a method for demolishing and rebuilding a medium-to-large-sized aqueduct body. Background Art

[0002] Aqueducts are overhead channels that convey water across rivers, valleys, depressions, and roads. Also known as viaducts or aqueducts, they are commonly used for irrigation and water supply, as well as for flood and sediment drainage. Large aqueducts can also be navigable. Aqueducts are primarily constructed using materials such as stone masonry, concrete, and reinforced concrete. Currently, the main construction methods for medium- and large-scale aqueducts in China (medium-sized aqueducts with an annual water diversion capacity ≥100 million cubic meters, and large aqueducts with an annual water diversion capacity ≥300 million cubic meters) include cast-in-place and prefabricated hoisting. Cast-in-place construction is categorized into full-frame and trough-making machine methods. Prefabricated hoisting methods are categorized by the lifting equipment used, including trough-making machine methods and crawler crane methods.

[0003] During the service life of some older aqueducts, cracks, leaks, and insufficient flow capacity often develop in one or more sections. Consequently, numerous risk reduction and reinforcement projects have emerged nationwide, including pier reinforcement and trough dismantling and reconstruction. Currently, these projects often require the restoration of the original aqueduct's functionality within a short period of time. Consequently, full-frame cast-in-place solutions and trough-making machines are not feasible for large aqueducts due to time constraints. The trough-building machine method of dismantling and rebuilding is also unfeasible due to the lack of specialized pier design. Furthermore, crawler cranes are not feasible due to limited working space on both sides. Furthermore, the need to dismantle and rebuild the aqueduct itself is challenging, especially given its proximity to surrounding residential buildings, making in-situ dismantling impossible.

[0004] In summary, for large-span aqueduct removal and reinforcement projects with limited working space, how to design an aqueduct demolition and reconstruction method that can take into account the demolition of the original aqueduct and the lifting of prefabricated parts of the new aqueduct, with a high degree of mechanization, guaranteed quality, short construction period, safety and reliability, and low environmental impact is of great significance to the removal of hazards and reinforcement of old aqueducts. Summary of the Invention

[0005] In view of this, the present invention provides a method for dismantling and rebuilding the body of a medium-to-large aqueduct. This method can not only establish a prefabrication plant near the damaged section of the aqueduct to realize the prefabrication of the aqueduct body, avoid occupying the linear construction period of the project, and ensure the construction period; but also use a tire-mounted gantry crane to realize the lifting of the original old aqueduct body and the prefabricated aqueduct body, thereby realizing rapid construction in a limited working space.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] The method for dismantling and rebuilding a medium-to-large-sized aqueduct body of the present invention comprises the following steps:

[0008] S1, prefabricated multi-span trough body parts;

[0009] S2, set up scaffolding, use a rope saw to remove one span of the old trough body, and form a passage to provide an entrance and exit for the gantry crane; start the gantry crane so that it spans the old trough body from the passage in step S2;

[0010] Among them, the gantry crane is a tire-type gantry crane;

[0011] S3: There are two gantry cranes. Adjust the distance between the two gantry cranes so that they are located above the same span of the old trough body. Remove the span of the old trough body from the main body of the trough body. Use the gantry crane to lift the old trough body. Control the two gantry cranes to move or turn synchronously and lift the old trough body to the dismantling plant. Repeat this process until multiple spans of the old trough body that need to be removed are removed in sequence and lifted to the dismantling plant.

[0012] S4: After the old trough body is completely dismantled, the two gantry cranes are moved to the prefabrication plant, and the trough body prefabricated parts are hoisted to the installation station and installed using the two gantry cranes. After the installation is completed, the gantry cranes are moved to the prefabrication plant, and the second span trough body prefabricated parts are hoisted to the installation station and fixed. This process is repeated, and the multiple span trough body prefabricated parts are installed one by one on the trough body main body in the construction order from one end to the other.

[0013] S5, the full-span scaffolding method is used to construct the last span of the aqueduct, and the terminal span and the prefabricated parts of the aqueduct are cast together to complete the construction of the starting span and the terminal span of the aqueduct.

[0014] In the above scheme, the present invention first adopts a rope saw to dismantle one span of the old trough body, providing access space for the gantry crane, so that the dismantled old trough bodies of multiple spans can be hoisted one by one to the dismantling plant, thereby realizing the rapid dismantling of the old trough body and improving the dismantling efficiency. In addition, during the dismantling process, the present invention can also set up an aqueduct prefabrication plant near the construction site, further ensure the construction period by prefabricating the trough body, and realize the lifting of the new aqueduct prefabricated parts by two gantry cranes that can move and turn independently, thus solving the problem that the demolition and reconstruction of large-span aqueducts in the past were limited in working space and difficult to construct quickly, and realizing the mechanized operation of the aqueduct demolition and reconstruction project, which can not only ensure the construction quality and safety, but also reduce the impact on the surrounding environment, reduce the demolition workload, save project investment, and greatly improve the construction efficiency.

[0015] In the present invention, the use of a wire saw to remove one span of the old trough in step S2 specifically includes: setting up wire saw support → determining the cutting section location → securing the wire saw equipment and installing the wire saw chain → cutting → lifting the sections using a truck crane to transport them to the dismantling plant. This method uses a wire saw to remove one span of the old trough, providing access for a gantry crane and paving the way for mechanized lifting of multiple spans of the old trough that require removal.

[0016] During actual construction, the preferred location for rope saw demolition is any span at either end of the section to be demolished, with one span being the starting span and the other being the last span to be demolished. After the starting span is demolished, the old trough body is dismantled in order from the starting span to the last span to be demolished and hoisted to the designated dismantling plant, thereby realizing the rapid dismantling of the old trough body.

[0017] In the present invention, in step S5, the final span of the aqueduct is constructed using the full-frame scaffolding method, which includes the following steps: foundation preparation → scaffolding erection → pre-stressing scaffolding → formwork erection → tying rebar and pre-embedded pipes → pouring concrete → curing → formwork removal → scaffolding removal. The final span of the aqueduct is cast on-site using the full-frame scaffolding method, providing space for the gantry crane to be moved out of the aqueduct.

[0018] In the present invention, the demolition and reconstruction method utilizes a hoist specifically designed for lifting the trough body prefabricated components. The hoist comprises a first connection unit, a second connection unit, and a lifting connection unit. The first connection unit comprises at least two groups of connecting bolts spaced apart within the trough body prefabricated component and a connecting plate secured to each group of the connecting bolts, the connecting plate having a first connecting ring. The second connection unit comprises a connecting block disposed on the first connecting ring, the connecting block having a pair of second connecting rings spaced apart. During actual prefabrication, a reliable connection between the hoist and the prefabricated component can be achieved by simply reserving bolt holes in the design location according to actual conditions, thereby reducing the difficulty of lifting the prefabricated component and improving the safety of the lifting.

[0019] Compared with the prior art, the present invention has the following advantages: the present invention first uses a rope saw to dismantle one span of the old trough body, providing access space for a gantry crane, so that the dismantled old trough bodies of multiple spans can be hoisted one by one to the dismantling plant, thereby realizing the rapid dismantling of the old trough body and improving the dismantling efficiency; during reconstruction, a gantry crane can be used to lift new trough body prefabricated parts, thereby realizing the rapid installation of trough body prefabricated parts; in addition, the present invention only needs to cast the last span of the trough body on site, further improving the reconstruction construction efficiency of the trough body.

[0020] During the demolition process, the present invention can also set up an aqueduct prefabrication plant near the construction site, further ensure the construction period by prefabricating the aqueduct body, and realize the lifting of the new aqueduct prefabricated parts by two gantry cranes that move and turn independently, solving the previous problems of limited working space and difficulty in rapid construction of large-span aqueduct demolition and reconstruction, and realizing the mechanized operation of the aqueduct demolition and reconstruction project, which can not only ensure the construction quality and safety, but also reduce the impact on the surrounding environment, reduce the demolition workload, save project investment, and greatly improve the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a construction flow chart of the present invention.

[0022] Figure 2 This is a schematic diagram of the aqueduct (the first span of the old aqueduct has been removed).

[0023] Figure 3 It is a schematic diagram of the lifting of the trough body prefabricated part of the present invention.

[0024] Figure 4 yes Figure 3 Enlarged view of the middle spreader.

[0025] Figure 5 yes Figure 3 side view. DETAILED DESCRIPTION

[0026] The following describes an embodiment of the present invention in detail with reference to the accompanying drawings. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process. However, the protection scope of the present invention is not limited to the following embodiment.

[0027] In the description of the present invention, unless otherwise specified or limited, the terms "connected" and "connection" that may appear should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0028] The present invention provides a method for dismantling and rebuilding the body of a medium-to-large aqueduct, which realizes the rapid dismantling of the original old aqueduct body and the rapid construction of the new aqueduct body, shortens the construction period, and solves the previous problems of limited working space and difficulty in rapid construction in the dismantling and reconstruction of large-span aqueducts. It realizes the mechanized operation of the aqueduct dismantling and reconstruction project, which not only ensures the construction quality and safety, but also reduces the impact on the surrounding environment, reduces the demolition workload, saves project investment, and greatly improves construction efficiency.

[0029] The following is combined with Figure 1-2 The demolition and reconstruction method of the present invention is described in more detail. Specifically, the demolition and reconstruction method of the medium-to-large-scale aqueduct body of the present invention includes the following steps:

[0030] S1: Identify the aqueduct section that needs to be dismantled and rebuilt, set up a prefabrication plant nearby, and prefabricate the required aqueduct components in advance to avoid interrupting the project's linear construction period and lay the foundation for restoring the original aqueduct's functionality in the shortest possible time.

[0031] S2: Scaffolding is set up and a rope saw is used to remove one span of the old trough to create a passageway, providing access for the gantry crane. The rope saw removal process steps are: setting up the rope saw support → determining the cutting section location → securing the rope saw equipment and installing the rope saw chain → cutting → lifting the sections by the truck crane and transporting them to the dismantling plant.

[0032] Wherein, during actual demolition, the rope saw demolition position is preferably any span of the two end spans of the section to be demolished, with one span as the starting span and the other span as the last demolition span;

[0033] The present invention adopts the rope saw demolition method to demolish one span of the old trough body, providing access space for the gantry crane, laying the foundation for the mechanized lifting of other multi-span old trough bodies that need to be demolished, facilitating the lifting of the dismantled multi-span old trough bodies one by one to the dismantling plant, and improving the demolition efficiency;

[0034] S3: After dismantling the first span, two rubber-tyred gantry cranes (hereinafter referred to as gantry cranes) were used for lifting. To accommodate the gantry cranes' travel needs, the roads on both sides of the original aqueduct were rebuilt to ensure their flatness and load-bearing capacity. Furthermore, since large aqueducts have different spans, such as 8-15m for simply supported beam aqueducts and 25-40m for cantilever beam aqueducts, in actual projects, a gantry crane F with an appropriate span must be selected based on the span of the original aqueduct.

[0035] S4: Two gantry cranes F are positioned from the self-passageway across the second span of the old aqueduct that needs to be dismantled. The span of the old aqueduct is removed from the main body of the aqueduct and secured with ropes. After the old aqueduct is lifted to a certain height, the two gantry cranes are controlled to move synchronously. When they reach the passageway, they turn and move out, lifting the removed aqueduct to the dismantling plant. The two gantry cranes F are then positioned from the self-passageway M across the third span of the old aqueduct. The process is repeated to lift the third span of the old aqueduct to the dismantling plant.

[0036] Repeat this process in the order of demolition from the starting span to the last span (i.e. Figure 2 The old tank body is dismantled in sequence (dismantled from end A to end B) and hoisted to the dismantling plant to achieve rapid dismantling of the old tank body;

[0037] In the present invention, during lifting, the two gantry cranes are always located above the same span of the old trough body, so that the force on the old trough body is balanced, the old trough body is lifted smoothly, and the construction safety is improved;

[0038] S5: After the old trough body is completely dismantled, the new trough body prefabricated parts are hoisted and installed. Specifically: two gantry cranes are moved into the prefabrication plant, positioned above one span of the new trough body prefabricated parts, and the trough body prefabricated parts are hoisted using the two gantry cranes;

[0039] Control the two gantry cranes F to move and turn synchronously so that their legs are located on both sides of the original aqueduct body, lift the first span prefabricated part to the last dismantling end, and fix it to the aqueduct body;

[0040] After the installation of the first span prefabricated part is completed, the double gantry crane F is controlled to move to the prefabrication plant and the above operation is repeated to lift the second span trough body prefabricated part to the installation location and install it on the first span trough body prefabricated part;

[0041] Repeat the above steps and press Figure 1 The installation of the prefabricated parts of the third span, the fourth span, ..., the (N-1) span of the trough body is completed in sequence from B to A, where N is an integer ≥ 30;

[0042] S6: The final span of the aqueduct is constructed using the full-span scaffolding method. The new aqueduct body is cast together with the main aqueduct, completing the demolition and reconstruction of this section of the aqueduct. The full-span scaffolding method includes the following steps: foundation preparation → scaffolding erection → pre-stressing scaffolding → formwork erection → tying rebar and pre-embedded pipes → pouring concrete → curing → formwork removal → scaffolding removal. The final span of the aqueduct is cast on-site using the full-span scaffolding method, providing clearance for the gantry crane to be moved out of the aqueduct.

[0043] In one embodiment of the present invention, in order to reduce the difficulty of lifting prefabricated parts and improve the lifting safety of prefabricated parts, when prefabricating the aqueduct body in multiple spans, bolt holes are reserved on the bottom plate 1.1 of each span of the trough body prefabricated parts 1, and a special lifting device 2 can be used to lift each new span of the trough body prefabricated parts, thereby improving the lifting safety.

[0044] The sling 2 used in the present invention adopts Figure 3-5 The structure shown includes a first connecting unit and a second connecting unit. The first connecting unit includes two groups of connecting bolts 2.1 (each group has at least four connecting bolts 2.1) arranged at intervals on the base plate 1.1 and a connecting plate 2.2 fixed to the prefabricated base plate 1.1 by the connecting bolts 2.1. The connecting plate 2.2 has first connecting rings 2.3, and the two first connecting rings 2.3 are arranged at intervals to facilitate connection with the second connecting unit; the second connecting unit includes a connecting block 2.4 arranged on the first connecting ring 2.3, and the connecting block 2.4 has a pair of second connecting rings 2.5 arranged at intervals.

[0045] During construction, the connecting plate is secured to the prefabricated base plate 1.1 using connecting bolts 2.1. The first connecting ring 2.3 and the connecting block 2.4 are then connected using pins. The second connecting ring 2.5 is then threaded through the lifting ring F1 of the gantry crane F using a long pin, connecting the prefabricated component to one of the gantry cranes F. This process is repeated until the other end of the prefabricated component is connected to the other gantry crane F. The two gantry cranes are then linked together to hoist the trough body prefabricated component to its installation location. Once the trough body prefabricated component is installed, the lifting fixture is removed, and the bolt holes in the prefabricated component are sealed with self-compacting fine aggregate, slightly expansive concrete.

[0046] In the present invention, due to limited working space, the tire-mounted gantry crane can move straight, diagonally, and horizontally, with a relatively small moving space. This solves the problem of limited working space and difficulty in rapid construction during the previous demolition and reconstruction of large-span aqueducts. It achieves mechanized operation of aqueduct demolition and reconstruction, ensures construction quality and safety, reduces the impact on the surrounding environment, saves project investment, and improves construction efficiency. The present invention utilizes a gantry crane to lift new prefabricated trough body parts, achieving rapid installation of trough body prefabricated parts. Only the last span of the trough body needs to be cast on-site, further improving the construction efficiency of the trough body demolition and reconstruction. The invention is particularly suitable for medium-sized aqueducts with an annual water diversion capacity of over 100 million cubic meters or large aqueducts with an annual drinking water capacity of over 300 million cubic meters.

[0047] Finally, it should be emphasized that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments without inventive effort, or replace some of the technical features therein with equivalents. Therefore, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for dismantling and rebuilding a medium or large aqueduct, characterized in that: The following steps are involved: S1, prefabricated multi-span trough body prefabricated parts; S2, set up scaffolding, use a rope saw to remove one span of the old trough body, and form a passage to provide an entrance and exit for the gantry crane; start the gantry crane so that it spans the old trough body from the passage in step S2; Among them, the gantry crane is a tire-type gantry crane; S3: There are two gantry cranes. Adjust the distance between the two gantry cranes so that they are located above the same span of the old trough body. Remove the span of the old trough body from the main body of the trough body. Use the gantry crane to lift the old trough body. Control the two gantry cranes to move or turn synchronously and lift the old trough body to the dismantling plant. Repeat this process until multiple spans of the old trough body that need to be removed are removed in sequence and lifted to the dismantling plant. S4: After the old trough body is completely dismantled, the two gantry cranes are moved to the prefabrication plant, and the trough body prefabricated parts are hoisted to the installation station and installed using the two gantry cranes. After the installation is completed, the gantry cranes are moved to the prefabrication plant, and the second span trough body prefabricated parts are hoisted to the installation station and fixed. This process is repeated, and the multiple span trough body prefabricated parts are installed one by one on the trough body main body in the construction order from one end to the other. S5: Use the full-span scaffolding method to construct the last span of the aqueduct, cast the terminal span and the prefabricated aqueduct parts together, and complete the construction of the starting and ending spans of the aqueduct. In which, the demolition and reconstruction method adopts a hoist specially used for lifting the trough body prefabricated parts, and the hoist includes a first connecting unit and a second connecting unit. The first connecting unit includes at least two groups of connecting bolts spaced apart in the trough body prefabricated parts and a connecting plate fixed to each group of the connecting bolts, and the connecting plate has a first connecting ring; the second connecting unit includes a connecting block arranged on the first connecting ring, and the connecting block has a pair of second connecting rings spaced apart.

2. The method for dismantling and rebuilding a medium-to-large-sized aqueduct according to claim 1, characterized in that: In S2, one span of the old trough body is dismantled using a rope saw, which specifically includes: setting up the rope saw support → determining the cutting section position → fixing the rope saw equipment and installing the rope saw chain → cutting → lifting and transporting to the dismantling plant by a truck crane.

3. The method for dismantling and rebuilding a medium-to-large-sized aqueduct according to claim 1, characterized in that: In S5, the full-floor scaffolding method is used to construct the last span of the trench, including the following steps: foundation treatment → erecting scaffolding → pre-pressing scaffolding → erecting formwork → tying steel bars and pre-buried pipes → pouring concrete → curing → removing formwork → removing scaffolding.

Images