Method for dismantling an old approach bridge
By combining a pickaxe machine and a bridge erecting machine, the problems of low construction efficiency, high safety risks, and environmental pollution in the demolition of approach bridges were solved, achieving efficient, safe, and economical demolition results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CCCC THIRD HARBOR ENGINEERING CO LTD
- Filing Date
- 2023-11-22
- Publication Date
- 2026-05-12
AI Technical Summary
Existing methods for dismantling approach bridges suffer from low construction efficiency, high safety risks, serious environmental pollution, and high economic costs. In particular, floating cranes and cranes are affected by natural factors such as water depth, tides, and waves during construction, and the stability and safety of the equipment are insufficient.
The bridge deck and beams on land were dismantled using a pickaxe, while the hollow slab beams on water were dismantled using a bridge erecting machine. On land, two pickaxes were used to chisel the beams near their ends and allow them to fall naturally to the ground. On water, the bridge erecting machine was used to dismantle the beams one span at a time. By combining small equipment and mature electric-driven special machinery, the construction process was simplified and efficiency was improved.
The project achieved efficient, safe, economical, and environmentally friendly dismantling of the approach bridge, simplified the construction process, reduced safety risks and environmental pollution, and improved construction efficiency.
Smart Images
Figure CN117513192B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of approach bridge demolition technology, and more particularly to a method for demolishing an old approach bridge. Background Technology
[0002] A wharf approach bridge is a passageway connecting the wharf to the land area by means of a bridge, where the water level fluctuates greatly or the riverbed slope is too steep to be suitable for an approach road. With the increasing scale of wharf transportation in my country, traffic volume is constantly increasing, and the number of overloaded and oversized vehicles is also rising, which has a certain impact on approach bridges. Some approach bridges that no longer meet modern transportation needs or have reached their design lifespan need to be demolished. Generally, the demolition of approach bridges is a short-term, demanding task, and involves significant challenges and high safety requirements, all while ensuring normal traffic flow.
[0003] The existing approach bridges are usually dismantled using floating cranes or cranes. However, when using floating cranes for dismantling, the impact of water depth must be carefully considered when working near the shore, and the draft of the floating crane must be taken into account. When working in near-shore waters, the mud level elevation must be measured in advance, and the construction window must be determined in conjunction with the tides. The daily construction time is not fixed, and some of the work may be at night. During the construction period, it is also affected by adverse natural factors such as tides, typhoons, and cold waves. Therefore, the construction efficiency is low. Moreover, the construction is affected by wind and waves, which can easily cause related safety risks to existing structures or workers and equipment. Furthermore, floating cranes are large vessels with high consumption of heavy fuel oil and diesel fuel, serious air pollution, and high noise. They also generate a lot of domestic waste, which requires special vessel recycling and treatment.
[0004] When using cranes for demolition, the old approach bridge surface is limited by load capacity, so large-tonnage cranes cannot be used. Therefore, only medium-sized and smaller cranes can be used. The lifting capacity of cranes generally decreases with the increase of lifting distance and lifting height. It is often necessary to equip them with additional components such as spreader poles. The load requirements at the outriggers are high during hoisting, and measures such as support and reinforcement are required. The operation of crane equipment is relatively complicated, requiring frequent relocation, resulting in low construction efficiency. The stability of the equipment itself is generally not high, and frequent relocation poses a high safety risk. During construction, each outrigger needs to be supported and reinforced. If used as equipment for demolishing the approach bridge span, the safety is relatively poor. Furthermore, the diesel and hydraulic oil of cranes will also generate significant air pollution and noise. Summary of the Invention
[0005] In view of this, the present invention provides a method for demolishing old approach bridges that is highly safe, simple and convenient to carry out, highly efficient, economical and environmentally friendly.
[0006] The present invention solves the above problems through the following technical means:
[0007] The method for dismantling the old approach bridge of the present invention includes the dismantling of the land section and the dismantling of the water section, and the construction steps are as follows:
[0008] S1. Based on the condition of the approach bridge deck and its ancillary works on the land section, small equipment such as pneumatic picks, handheld cutting machines, air compressors, and shaving machines will be used to demolish the cast-in-place wear layer, cast-in-place surface layer, and ancillary structures on the land section bridge deck.
[0009] S2. Following the order from upstream to downstream, use a pickaxe to dismantle multiple hollow slab beams of the same span on land in sequence, specifically including the following steps:
[0010] S201. Two pickaxe machines are used on the upstream side to chisel off the hollow slab beam at the near end of 1 / 6 to 1 / 3 of the land section, and the beam is broken into three sections and falls to the ground naturally.
[0011] S202. Use a pickaxe to break the fallen beam segment into multiple small pieces;
[0012] S203. The broken beams are handed over to the excavator and pickaxe for further crushing, sorting and transportation.
[0013] S204. Repeat steps S201-S203 to remove the remaining hollow slab beams in the span.
[0014] S3. After dismantling one span of the hollow slab beam on land, use a pickaxe to remove the cap beam at its front end. This includes the following steps:
[0015] S301. Using two pickaxe machines on the same side, the cap beam is chiseled off at 1 / 6 to 1 / 3 of its length from the end. The beam, which is broken into three sections, falls to the ground naturally.
[0016] S302. Use a pickaxe to break the fallen beam segment into multiple small pieces;
[0017] S303. The broken beams are handed over to the excavator and pickaxe for further crushing, sorting and transportation.
[0018] S4. Following the order from the bank side to the river side, repeat steps S2-S3 to dismantle the remaining hollow slab beams and cap beams on the land section in sequence.
[0019] S5. Use a pickaxe to break up and demolish the pile foundation on land;
[0020] S6. At the beginning of the approach bridge on the water section, assemble and erect a bridge erecting machine that spans the old and new approach bridges, and position the bridge erecting machine and beam transport vehicle.
[0021] S7. The hollow slab beams in the water section are dismantled one span at a time from the riverbank to the river side using a bridge erecting machine. The specific steps include:
[0022] S701. Use a cutting machine to cut the hollow slab beam from the surface layer downwards along the joint;
[0023] S702. A hollow slab beam is lifted to a certain height using a bridge erecting machine in conjunction with a lifting auxiliary device;
[0024] S703. Move the lifted hollow slab beam laterally to the top of the beam transport vehicle on the side of the new approach bridge;
[0025] S704. Lower the hollow slab beam from the top of the beam transport vehicle onto the beam transport vehicle, secure it, and transport it.
[0026] S705. Repeat steps S702-S704 in sequence from one side to the other to remove the remaining hollow slab beams in the span.
[0027] S706. The bridge erecting machine moves longitudinally across the span, and repeats steps S702-S705 in the reverse order of demolition to remove multiple hollow slab beams in the span in sequence.
[0028] S707. Repeat step S706 from the bank side to the river side in an "S" shaped sequence to remove the remaining hollow slab beams in the water section one by one and one span by span.
[0029] S8. Remove the bridge erecting machine from the cap beam along the water section and dismantle it.
[0030] Preferably, in step S201, two pickaxe machines chisel off the hollow slab beam at one-third of its length from both ends.
[0031] Preferably, step S5 specifically includes the following steps:
[0032] S501. Use multiple pickaxe machines to break and demolish the corresponding pile foundations one by one from the same side;
[0033] S502. The broken pile foundations are handed over to the excavator and pickaxe for further crushing, sorting and transportation.
[0034] S503. Following the order from the bank side to the river side, repeat steps S501-S502 to remove the remaining pile foundations on land in sequence.
[0035] Preferably, in step S501, multiple pickaxe machines dismantle the pile foundation one by one in sequence from the upstream side to the downstream side.
[0036] Preferably, in step S6, a sand bucket or a steel bucket is used as a support bucket to support the front outriggers and track of the bridge erecting machine.
[0037] Preferably, in step S6, the transverse track of the bridge erecting machine is made of welded I-beam rails, and the transverse track extends into the surface layer of the newly built wharf.
[0038] Preferably, in step S701, a wheel saw is mainly used to cut the surface layer, and a wire saw is used to cut areas that are difficult to cut.
[0039] As can be seen from the above technical solution, the present invention has the following beneficial effects:
[0040] The method for dismantling the old approach bridge of this invention mainly uses a pickaxe for the land section demolition. Two pickaxes are used to chisel the hollow slab beams and cap beams at the near end of the beam to dismantle the land section. This ensures that the broken beams fall naturally to the ground. The demolition scheme is simple and efficient. The water section demolition mainly uses a bridge erecting machine. The method for dismantling the hollow slab beams in the water section is to use the bridge erecting machine to dismantle them one by one, span by span, from the shore to the river side in an "S" shaped sequence. This effectively reduces the number of lateral movements of the bridge erecting machine, simplifies the construction process, and improves construction efficiency. As a mature electric-driven special mechanical equipment, the bridge erecting machine is superior to floating cranes and cranes in terms of safety, construction period, process operability, economy, and environmental protection. It can perfectly solve the problem of dismantling approach bridges under restricted conditions. Attached Figure Description
[0041] Figure 1 This is a schematic diagram of the land section demolition range of the old approach bridge in the old approach bridge demolition method of the present invention;
[0042] Figure 2 This is a schematic plan view of the removal of the hollow slab beam on land in the method for removing the old approach bridge of the present invention;
[0043] Figure 3 This is a schematic plan view of the removal of the cap beam on the land section in the method for removing the old approach bridge of the present invention;
[0044] Figure 4 This is a schematic diagram of the demolition cross-section of the onshore pile foundation in the demolition method of the old approach bridge of the present invention;
[0045] Figure 5 This is a schematic diagram of the bridge erecting machine in the method for dismantling the old approach bridge of the present invention.
[0046] Figure 6 This is a schematic diagram of the cutting of the hollow slab beam in the water section of the old approach bridge demolition method of the present invention;
[0047] Figure 7 This is a schematic plan view of the dismantling of the hollow slab beam in the water section of the old approach bridge dismantling method of the present invention;
[0048] Figure 8 This is a schematic diagram of the longitudinal span-crossing step S7001 of the bridge erecting machine in the method for dismantling the old approach bridge of the present invention;
[0049] Figure 9 This is a schematic diagram of the longitudinal crossing step S7002 of the bridge erecting machine in the method for dismantling the old approach bridge of the present invention;
[0050] Figure 10 This is a schematic diagram of the longitudinal crossing step S7003 of the bridge erecting machine in the method for dismantling the old approach bridge of the present invention;
[0051] like Figure 1 - Figure 10 , Cast-in-place wearing course-11, Cast-in-place surface course-12, Auxiliary structure-13, Hollow slab beam of land section-14, Cap beam of land section-15, Pile foundation of land section-16, Picking machine-17, Approach bridge of new section-20, Hollow slab beam of water section-31, Cap beam of water section-32, Beam cutting line-33, Support bucket-34, Track-35, Bridge erecting machine-36, Front outrigger-361, Middle outrigger-362, Rear outrigger-363, Rear auxiliary outrigger-364, Overhead crane-365. Detailed Implementation
[0052] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0053] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.
[0054] The present invention will now be described in detail with reference to the accompanying drawings, such as... Figures 1 to 2 As shown: The method for dismantling the old approach bridge described in this embodiment includes the dismantling of the land section and the dismantling of the water section, wherein the scope of the land section dismantling is as follows. Figure 1 As shown, the construction steps are as follows:
[0055] S1. Based on the condition of the approach bridge deck and its ancillary works on the land section, demolish the cast-in-place wear layer 11, cast-in-place surface layer 12 and ancillary structure 13 on the land section bridge deck.
[0056] S2. In order from upstream to downstream, such as Figure 2As indicated by the arrow, the multiple hollow slab beams of the same span on land are dismantled sequentially using a pickaxe 17, specifically including the following steps:
[0057] S201. Two pickaxe machines 17 are used on the upstream side to chisel off the hollow slab beam 14 at the near end of 1 / 6 to 1 / 3 of the land section, and the beam body, which is broken into three sections, falls to the ground naturally.
[0058] S202. Use pickaxe 17 to break the fallen beam segment into multiple small pieces;
[0059] S203. The broken beams are handed over to the excavator and pick 17 for further crushing, sorting and transportation.
[0060] S204. Repeat steps S201-S203 to remove the remaining hollow slab beams in the span.
[0061] S3. After dismantling one span of the onshore hollow slab beam 14, use a pickaxe 17 to dismantle the onshore cap beam 15 at its front end, such as... Figure 3 As shown, the specific steps include:
[0062] S301. Using two pickaxe machines 17 on the same side, the beam 15 on the land section is chiseled off at the near end of 1 / 6 to 1 / 3 of the distance, and the beam is broken into three sections and falls to the ground naturally.
[0063] S302. Use pickaxe 17 to break the fallen beam segment into multiple small pieces;
[0064] S303. The broken beams are handed over to the excavator and pick 17 for further crushing, sorting and transportation.
[0065] S4. Following the order from the bank side to the river side, repeat steps S2-S3 to dismantle the remaining hollow slab beams 14 and cap beams 15 of the land section in sequence.
[0066] S5, demolition of pile foundation 16 on land, such as Figure 4 As shown, the specific steps include:
[0067] S501. Use multiple pickaxe machines 17 to break and demolish the corresponding multiple sets of onshore pile foundations 16 one by one from the same side.
[0068] S502. The broken land section pile foundation 16 is handed over to the rear excavator and pick 17 for further crushing, sorting and transportation.
[0069] S503. Following the order from the bank side to the river side, repeat steps 501-502 to remove the remaining land section pile foundations 16 in sequence.
[0070] S6. At the starting point of the approach bridge on the water section, assemble and erect the bridge erecting machine 36 across the old and new approach bridges, and position the bridge erecting machine 36 and the beam transport vehicle (not shown in the figure). Figure 5 As shown;
[0071] S7. Using a bridge erecting machine 36, the hollow slab beams 31 in the water section are dismantled one span at a time from the bank to the river side, specifically including the following steps:
[0072] S701, such as Figure 6 As shown, a cutting machine is used to cut the hollow slab beam 31 in the water section from the surface layer downwards.
[0073] S702. A bridge erecting machine 36, in conjunction with a lifting auxiliary device, is used to lift a hollow slab beam 31 of the upper section of the river to a certain height.
[0074] S703. Move the lifted hollow slab beam 31 on the water to the top of the beam transport vehicle on the side of the new approach bridge;
[0075] S704. Lower the hollow slab beam 31 above the beam transport vehicle onto the beam transport vehicle, secure it, and transport it.
[0076] S705. Repeat steps S702-S704 in sequence from one side to the other to remove the remaining hollow slab beams 31 above water in the middle of the span.
[0077] S706, the bridge erecting machine 36 moves longitudinally across the span, and repeats steps S702 - S705 in the opposite order of dismantling to the previous span to dismantle multiple hollow slab beams 31 in the upper section of the span in sequence;
[0078] In step S706, the longitudinal movement of the bridge erecting machine 36 across the span specifically includes the following steps:
[0079] S7001, such as Figure 8 As shown, the front outrigger 361 and the rear auxiliary outrigger 364 of the bridge erecting machine 36 are retracted, and the rear outrigger 363 is moved to the rear of the bridge erecting machine 36. At the same time, the overhead crane 365 is moved to the rear of the main beam of the bridge erecting machine 36 as a counterweight.
[0080] S7002, such as Figure 9 As shown, the bridge erecting machine 36 moves longitudinally to the designated position under the drive of the middle and rear support legs 363 rollers: the rear auxiliary support leg 364 is pushed out by the hydraulic cylinder and supported on the bridge deck, the front support leg 361 is pushed out and supported on the cap beam, and the middle support leg 362 is retracted by the hydraulic cylinder and hoisted to the designated position.
[0081] S7003, such as Figure 10 As shown, the middle support leg 362 is pushed out by the hydraulic cylinder and supported on the bridge deck, the rear support leg 363 retracts and is released from the air, and at the same time the overhead crane 365 moves to the front counterweight. The bridge erecting machine 36 moves forward longitudinally to the designated position under the drive of the rollers of the middle and front support legs 361.
[0082] S707, such as Figure 7 As shown, step S706 is repeated from the bank side to the river side in an "S" shaped sequence to remove the remaining hollow slab beams 31 of the water section one by one and span by span.
[0083] S8. Remove the bridge erecting machine from the cap beam along the water section and dismantle it.
[0084] The demolition method for the old approach bridge described in this embodiment mainly uses a pickaxe machine 17 for the land section demolition. Two pickaxe machines 17 are used to chisel the hollow slab beams and cap beams of the land section at the near end of 1 / 6 to 1 / 3 of the beam body, which can ensure that the broken beam body falls naturally to the ground. The demolition scheme is simple and efficient. The demolition of the water section is mainly carried out using a bridge erecting machine 36. The method of demolishing the hollow slab beams 31 in the water section is to use the bridge erecting machine 36 to demolish them one by one and one span by span from the shore to the river side in an "S" shaped sequence. This can effectively reduce the number of lateral movements of the bridge erecting machine 36, simplify the construction process, and thus improve the construction efficiency. As a mature electric-driven special mechanical equipment, the bridge erecting machine 36 is superior to floating cranes and cranes in terms of safety, construction period, process operability, economy, and environmental protection. It can perfectly solve the problem of approach bridge demolition under restricted conditions.
[0085] As the most preferred embodiment of this example, in step S201, two pickaxe machines 17 chisel off the hollow slab beam at one-third of its length at both ends.
[0086] In order to facilitate the demolition of the pile foundation, improve demolition efficiency, and reduce energy consumption, as a further improvement to the above technical solution, in step S501, multiple pickaxe machines 17 demolish the pile foundation one by one in sequence from the upstream side to the downstream side.
[0087] To ensure that the track 35 is in a horizontal state, in step S6, sand buckets or steel buckets are usually used as support buckets 34 to support the front outrigger 361 of the bridge erecting machine 36 and the track 35. To ensure stability, small steel plates are welded on both sides and the outside of the support buckets 34. Adjacent support buckets 34 are connected by steel sections. The steel sections are connected to the support buckets 34 by bolts in the small steel plates. Triangular braces are set on the outside of the support buckets 34 to ensure longitudinal stability. The triangular braces are connected to the support buckets 34 by bolts in the small steel plates. Wooden wedges or steel plates are used to fill and level the gaps between the support buckets 34 and the track 35 to ensure that the track 35 is in a horizontal state.
[0088] Specifically, in step S6, the transverse track 35 of the bridge erecting machine 36 is made of welded I-beam rails 35, and the transverse track 35 extends into the surface layer of the newly built wharf.
[0089] In the specific implementation of step S701, a wheel saw is mainly used to cut the surface layer, and a wire saw is used to cut areas that are difficult to cut.
[0090] 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 it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.
Claims
1. A method for dismantling an old approach bridge, characterized in that: The demolition includes both land-based and water-based sections, and the construction steps are as follows: S1. Based on the condition of the approach bridge deck and its ancillary works on the land section, demolish the cast-in-place wear layer, cast-in-place surface layer and ancillary structures on the land section bridge deck; S2. Following the order from upstream to downstream, use a pickaxe to dismantle multiple hollow slab beams of the same span on land in sequence, specifically including the following steps: S201. Two pickaxe machines are used on the upstream side to chisel off the hollow slab beam at the near end of 1 / 6 to 1 / 3 of the land section, and the beam is broken into three sections and falls to the ground naturally. S202. Use a pickaxe to break the fallen beam segment into multiple small pieces; S203. The broken beams are handed over to the excavator and pickaxe for further crushing, sorting and transportation. S204. Repeat steps S201-S203 to remove the remaining hollow slab beams in the span. S3. After dismantling one span of the hollow slab beam on land, use a pickaxe to remove the cap beam at its front end. This includes the following steps: S301. Using two pickaxe machines on the same side, the cap beam is chiseled off at 1 / 6 to 1 / 3 of its length from the end. The beam, which is broken into three sections, falls to the ground naturally. S302. Use a pickaxe to break the fallen beam segment into multiple small pieces; S303. The broken beams are handed over to the excavator and pickaxe for further crushing, sorting and transportation. S4. Following the order from the bank side to the river side, repeat steps S2-S3 to dismantle the remaining hollow slab beams and cap beams on the land section in sequence. S5. Use a pickaxe to break up and demolish the pile foundation on land; S6. At the beginning of the approach bridge on the water section, assemble and erect a bridge erecting machine that spans the old and new approach bridges, and position the bridge erecting machine and beam transport vehicle. S7. The hollow slab beams in the water section are dismantled one span at a time from the riverbank to the river side using a bridge erecting machine. The specific steps include: S701. Use a cutting machine to cut the hollow slab beam from the surface layer downwards along the joint; S702. A hollow slab beam is lifted to a certain height using a bridge erecting machine in conjunction with a lifting auxiliary device; S703. Move the lifted hollow slab beam laterally to the top of the beam transport vehicle on the side of the new approach bridge; S704. Lower the hollow slab beam from the top of the beam transport vehicle onto the beam transport vehicle, secure it, and transport it. S705. Repeat steps S702-S704 in sequence from one side to the other to remove the remaining hollow slab beams in the span. S706. The bridge erecting machine moves longitudinally across the span, and repeats steps S702-S705 in the reverse order of demolition to remove multiple hollow slab beams in the span in sequence. S707. Repeat step S706 from the bank side to the river side in an "S" shaped sequence to remove the remaining hollow slab beams in the water section one by one and one span by span. S8. Remove the bridge erecting machine from the cap beam along the water section and dismantle it.
2. The method for dismantling an old approach bridge according to claim 1, characterized in that: In step S201, two pickaxe machines chisel off the hollow slab beam at one-third of its length from both ends.
3. The method for dismantling an old approach bridge according to claim 1, characterized in that: Step S5 specifically includes the following steps: S501. Use multiple pickaxe machines to break and demolish the corresponding pile foundations one by one from the same side; S502. The broken pile foundations are handed over to the excavator and pickaxe for further crushing, sorting and transportation. S503. Following the order from the bank side to the river side, repeat steps S501-S502 to dismantle the remaining pile foundations on land in sequence.
4. The method for dismantling an old approach bridge according to claim 3, characterized in that: In step S501, multiple pickaxe machines demolish the piles one by one in sequence from the upstream side to the downstream side.
5. The method for dismantling an old approach bridge according to claim 1, characterized in that: In step S6, sand buckets or steel buckets are used as support buckets to support the front outriggers and track of the bridge erecting machine.
6. The method for dismantling an old approach bridge according to claim 5, characterized in that: In step S6, the transverse track of the bridge erecting machine is made of welded I-beam rails, and the transverse track extends into the surface layer of the newly built wharf.
7. The method for dismantling an old approach bridge according to claim 1, characterized in that: In step S701, a wheel saw is mainly used to cut the surface layer, and a wire saw is used to cut areas that are difficult to cut.