Method for dismantling concrete sidewalk slab of tied-arch bridge under limiting conditions
By combining the design of lifting points with the classification of slab segments using a truck crane, the time-consuming and labor-intensive problem of removing concrete sidewalk slabs was solved, and a fast and safe removal effect was achieved, meeting the construction requirements under restrictive conditions.
Patent Information
- Application Number
- CN202510903039.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-01
- Publication Date
- 2025-09-09
AI Technical Summary
Existing technologies are time-consuming and labor-intensive when removing concrete sidewalk slabs, cannot control the direction of crushing, pose safety hazards, and cannot be quickly removed under restricted conditions.
A truck crane combined with a lifting point design is adopted, and the space between adjacent lifting rods is used to divide the sidewalk slab into blocks. The blocks are then classified according to the arch rib height. By optimizing the operating radius and boom length of the truck crane, the overall lifting and removal of the slab segments can be achieved.
The concrete sidewalk slab was removed quickly, safely and reliably without affecting traffic and navigation, meeting the construction schedule requirements.
Smart Images
Figure CN120608469A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of bridge demolition, and in particular to a method for demolishing concrete sidewalk slabs of a tied arch bridge under restricted conditions. Background Art
[0002] In tied-arch bridges, concrete sidewalk slabs have been widely used due to their high structural rigidity, convenient construction, short construction period and economical cost. In particular, concrete sidewalk slabs are widely used in bridges across rivers on urban roads.
[0003] Concrete sidewalk slabs are affected by multiple factors such as construction technology, construction level, limitations of concrete materials themselves, and lax construction control. After completion, the concrete sidewalk slabs have local damage at the ends of many beams; the steel plates at the ends of many beams of the sidewalk slabs are locally rusted; the placement of the sidewalk slabs on the beams is improperly controlled, resulting in different overlap lengths between the sidewalk slabs and the beams, with some overlap lengths being very short, and many sidewalk slabs have shear cracks and damage at the support points on the beams, posing a risk of falling beams.
[0004] As bridges become operational, the sidewalk slabs become unreinforceable or unworthy of reinforcement, necessitating demolition. Currently, most such demolition projects are performed manually using small cutting machines. This method is time-consuming and labor-intensive, and the direction of the broken sidewalk slabs cannot be controlled, easily causing damage to passing vehicles, pedestrians, and boats. Summary of the Invention
[0005] An embodiment of the present application provides a method for dismantling the concrete sidewalk slab of a tied arch bridge under restricted conditions, which can achieve the purpose of directly dismantling the concrete sidewalk slab of a tied arch bridge under restricted conditions.
[0006] The present invention provides a method for dismantling a concrete sidewalk slab of a tied arch bridge under restrictive conditions, which comprises the following steps: Using a straight line parallel to the transverse bridge direction and passing through the hanger as a dividing line, the sidewalk slab is divided into blocks along the longitudinal bridge direction to obtain multiple slab segments; According to the positions of the road slab segments, all road slab segments are divided into road slab segments in the arch foot area and road slab segments in the boom area; Setting a lifting point on the road slab segment and lifting the lifting point by using a truck crane; For the road plate segment in the boom area, adjust the posture of the road plate segment and adjust the boom of the truck crane so that the road plate segment is rotated out from the space between the two adjacent booms; And so on, complete the removal of all the track slab segments in the boom area; For the road slab segment in the arch foot area, adjust the posture of the road slab segment and adjust the boom of the truck crane so that the road slab segment is rotated out of the space above the arch rib; Similarly, all the road slab segments in the arch foot area are demolished.
[0007] In some embodiments, the method further comprises: The sidewalk slab is divided into blocks along the transverse direction of the bridge so that there are multiple sidewalk slab segments distributed along the transverse direction of the bridge between two adjacent hangers.
[0008] In some embodiments, after dividing the sidewalk slab into blocks, the method further comprises: Clean the joints of the sidewalk slabs.
[0009] In some embodiments, before dividing the sidewalk slab into blocks, the method further comprises: Remove the railings and disconnect the steel bars of the ground burden.
[0010] In some embodiments, a suspension point is provided on the track plate segment, specifically including: Opening a hoisting hole on the track plate segment; Arrange a hanger bar at the bottom of the road slab segment; Insert one end of the wire rope into the lifting hole and tighten the lifting rod; The other ends of the steel wire ropes are connected to form the hanging point.
[0011] In some embodiments, after being transferred out, the product is loaded onto a flatbed truck for transportation.
[0012] In some embodiments, for the road slab segment in the boom area, the boom of the truck crane is driven to extend from the space below the arch rib and lift the lifting point of the road slab segment.
[0013] In some embodiments, for a road plate segment in a boom area, adjusting the posture of the road plate segment and adjusting the boom of the truck crane so that the road plate segment is rotated out of the space between two adjacent booms specifically includes: By manually pulling the guy rope, the posture of the road plate segment is rotated from the longitudinal bridge direction to the transverse bridge direction; The boom of the truck crane is retracted and rotated, and the track plate segment is rotated in coordination therewith until the track plate segment is rotated out of the space between two adjacent booms.
[0014] In some embodiments, for the road slab segment in the boom area, the boom of the truck crane is driven to extend from the space above the arch rib and lift the lifting point of the road slab segment.
[0015] In some embodiments, for a road plate segment in the arch foot area, adjusting the posture of the road plate segment and adjusting the boom of the truck crane so that the road plate segment is rotated out of the space above the arch rib specifically includes: Adjusting the boom of the truck crane to lift the track slab segment to above the arch rib; By manually pulling the guy rope, the posture of the road plate segment is rotated from the longitudinal bridge direction to the transverse bridge direction; The boom of the mobile crane is rotated until the track plate segment is rotated out of the space above the arch rib.
[0016] The beneficial effects of the technical solution provided by this application include: An embodiment of the present application provides a method for dismantling concrete sidewalk slabs of a tied arch bridge under restricted conditions. The dismantling method of the present application cleverly utilizes the space between adjacent hangers to divide the sidewalk slabs into blocks, and classifies all the slab segments according to the height of the arch ribs. By optimizing the operating radius of the automobile crane and controlling the length of the boom, the divided slab segments are hoisted and dismantled as a whole according to the conditions. The operation is simple, safe and reliable, and the sidewalk slabs can be quickly dismantled without affecting traffic and navigation, meeting the construction period requirements, and achieving the purpose of directly dismantling the concrete sidewalk slabs of a tied arch bridge under restricted conditions. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0018] Figure 1 A cross-sectional view of a sidewalk slab provided in an embodiment of the present application; Figure 2 A plan view of the sidewalk slab provided for an embodiment of the present application; Figure 3 A diagram of the hoisting arrangement of the track slab segments provided in an embodiment of the present application; Figure 4 A schematic diagram of lifting a track plate segment in a boom area according to an embodiment of the present application; Figure 5 for Figure 4 A top view of Figure 6 A schematic diagram of the attitude adjustment of the track plate segments in the boom area provided in an embodiment of the present application; Figure 7 for Figure 6 A top view of Figure 8 A schematic diagram of a boom retracted in the boom area provided in an embodiment of the present application; Figure 9 for Figure 8 A top view of Figure 10 Schematic diagram of the rotating boom and track plate segments in the boom area provided in an embodiment of the present application; Figure 11 for Figure 10 A top view of Figure 12 A schematic diagram of loading a track slab segment in a boom area according to an embodiment of the present application; Figure 13 A schematic diagram of lifting a slab segment in the arch foot area provided in an embodiment of the present application; Figure 14 for Figure 13 A top view of Figure 15 A schematic diagram of the arch foot area adjustment arm provided in an embodiment of the present application; Figure 16 for Figure 15 A top view of Figure 17 Schematic diagram of the rotating boom and track plate segments in the arch foot area provided in an embodiment of the present application; Figure 18 for Figure 17 A top view of Figure 19 Schematic diagram of loading the road slab segments in the arch foot area provided in an embodiment of the present application.
[0019] In the figure: 1. Hanging rod; 2. Road slab segment; 3. Truck crane; 4. Boom; 5. Arch rib; 6. Handrail; 7. Ground burden; 8. Lifting hole; 9. Lifting rod; 10. Wire rope; 11. Flatbed truck; 12. Bridge deck driving area; 13. Bridge deck construction area; 14. Existing pipelines; 15. Pavement layer; 16. Arch rib area. DETAILED DESCRIPTION
[0020] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.
[0021] The old sidewalk slab has many problems. In addition, the existence of the tie-arch bridge's boom area restricts the crane's ability to lift the sidewalk slab on the motorway. How to safely and quickly remove the existing tied-arch bridge's concrete sidewalk slab without affecting the bridge deck's traffic and ensuring the safety of navigation and surrounding building structures is an urgent problem that needs to be solved. Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 、 Figure 13 、 Figure 14 、 Figure 15 、 Figure 16 、 Figure 17 、 Figure 18 and Figure 19 As shown, the embodiment of the present application provides a method for dismantling a concrete sidewalk slab of a tied arch bridge under restrictive conditions, which includes the following steps: 101: Using a straight line parallel to the transverse bridge direction and passing through the hanger 1 as a dividing line, the sidewalk slab is divided into blocks along the longitudinal bridge direction to obtain multiple slab segments 2.
[0022] It is understood that when step 101 is performed, the step of traffic diversion is also included. Specifically, see Figure 4 As shown, the bridge deck forms a bridge deck driving area 12 and a bridge deck construction area 13. The bridge deck driving area includes a motor vehicle lane and a non-motor vehicle lane. The bridge deck construction area 13 is immediately closed and non-motor vehicles and pedestrians are guided to the non-motor vehicle lane in time.
[0023] See also Figure 1 As shown, before the sidewalk slab is divided into blocks, the attachments on the sidewalk slab need to be removed, including removing the handrail 6 and disconnecting the steel bars of the ground sheet 7. The steel bars of the handrail 6 and the ground sheet 7 are cut by artificial oxygen.
[0024] After the sidewalk slabs are divided into blocks, the joints of the sidewalk slabs also need to be cleaned.
[0025] If the sidewalk slab is wide along the transverse direction of the bridge, it can be further divided into blocks. For details, see Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, the sidewalk slab is divided into blocks along the transverse direction of the bridge, so that there are multiple sidewalk slab segments 2 distributed along the transverse direction of the bridge between two adjacent hangers 1.
[0026] 102: According to the positions of the road slab segments 2, all road slab segments 2 are divided into road slab segments 2 in the arch foot area and road slab segments 2 in the boom area.
[0027] It can be understood that since the arch ribs 5 are in an arc shape, in the tied arch bridge, the arch ribs 5 at the arch feet at both ends are lower in height, while the arch ribs 5 in the middle area between the two ends are higher in height. Therefore, the arch ribs 5 are divided into two arch foot areas and the middle hanger area, and then all the road plate segments 2 can be divided into road plate segments 2 in the arch foot area and road plate segments 2 in the hanger area.
[0028] It can be understood that the lengths of the arch foot area and the hanger area along the longitudinal direction of the bridge can be determined according to actual construction needs.
[0029] 103: Setting a lifting point on the road slab segment 2 and lifting the lifting point using the truck crane 3.
[0030] 104: See Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 As shown, for the road plate segment 2 in the boom area, the posture of the road plate segment 2 is adjusted, and the arm 4 of the truck crane 3 is adjusted so that the road plate segment 2 is rotated out from the space between the two adjacent booms 1. After being rotated out, it is loaded onto a flatbed truck 11 for transportation; and so on, the removal of all road plate segments 2 in the boom area is completed.
[0031] 105: See Figure 13 、 Figure 14 、 Figure 15 、 Figure 16 、 Figure 17 、 Figure 18 and Figure 19 As shown, for the road slab segment 2 in the arch foot area, the posture of the road slab segment 2 is adjusted, and the arm 4 of the truck crane 3 is adjusted so that the road slab segment 2 is rotated out from the space above the arch rib 5. After being rotated out, it is loaded onto a flatbed truck 11 for transportation outside; and so on, the removal of all road slab segments 2 in the arch foot area is completed, wherein the projection of the arch rib 5 on the sidewalk slab forms the arch rib area 16.
[0032] The demolition method of the present application cleverly utilizes the space between adjacent hangers 1 to divide the sidewalk slab into blocks, classifies all the road slab segments according to the height of the arch rib 5, and optimizes the operating radius of the truck crane and controls the length of the boom to hoist and demolish the divided road slab segments as a whole according to the situation. The operation is simple, safe and reliable, and the sidewalk slab can be quickly demolished without affecting traffic and navigation, meeting the construction schedule requirements and achieving the purpose of directly demolishing the concrete sidewalk slab of the tied arch bridge under restricted conditions.
[0033] See also Figure 2 and Figure 3 As shown, in step 103, a hanging point is set on the track plate segment 2, which specifically includes the following steps: 201: Open a lifting hole 8 on the road plate segment 2.
[0034] In order to ensure smooth lifting, the lifting holes 8 opened on the track plate segment 2 appear in pairs and are symmetrically arranged on the track plate segment 2.
[0035] The position of the hanging hole 8 is determined in combination with the height of the existing pipeline 14 under the sidewalk slab, and the existing pipeline 14 is avoided as much as possible to avoid damaging the existing pipeline 14 during the hole extraction process and making it difficult to insert the hanging rod 9 after the hole extraction.
[0036] Before drilling the lifting holes 8 , the pavement layer 15 on the surface of the road slab segment 2 may be loosened and removed.
[0037] 202: A hanger bar 9 is provided at the bottom of the road slab segment 2.
[0038] 203: Insert one end of the steel wire rope 10 into the hoisting hole 8 and tighten the hoisting rod 9; The hanger bar 9 is made of two 80cm long HRB400 steel bars welded in parallel. The hanger bar 9 passes through the sidewalk slab from the lifting hole 8 and holds the bottom of the sidewalk slab. After the wire rope 10 passes through the hanger bar 9, the wire rope 10 is immediately hooked and tightened.
[0039] 204: The other ends of the steel wire ropes 10 are connected to form the lifting point, which is connected to the hook of the truck crane 3.
[0040] Since the arch ribs 5 are in an arc shape, in the tied arch bridge, the arch ribs 5 at the arch feet at both ends are lower in height, while the arch ribs 5 in the middle area between the two ends are higher in height.
[0041] Therefore, in this application, all road slab segments are classified according to the height of the arch rib 5. The road slab segments 2 in the middle area are directly transferred out from between two adjacent booms 1. That is, for the road slab segments 2 in the boom area, the boom 4 of the truck crane 3 is driven to extend from the space below the arch rib 5 and lift the road slab segment 2 by its lifting point, thereby directly transferring the road slab segment 2 out from between two adjacent booms 1. The road slab segments 2 at both ends can be directly transferred out from above the arch rib 5 by the truck crane 3. That is, for the road slab segments 2 in the boom area, the boom 4 of the truck crane 3 is driven to extend from the space above the arch rib 5 and lift the road slab segment 2 by its lifting point, thereby directly transferring the road slab segment 2 from above the arch rib 5.
[0042] Specifically, see Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 As shown, for the road plate segment 2 in the boom area, the posture of the road plate segment 2 is adjusted, and the boom 4 of the truck crane 3 is adjusted so that the road plate segment 2 is rotated out from the space between the two adjacent booms 1, specifically including: 301: Manually pull the guy rope to rotate the posture of the road plate segment 2 from the longitudinal bridge direction to the transverse bridge direction.
[0043] 302 : Contract and rotate the boom 4 of the truck crane 3 , and rotate the track plate segment 2 in coordination, until the track plate segment 2 is rotated out of the space between the two adjacent booms 1 .
[0044] Specifically, see Figure 13 、 Figure 14 、 Figure 15 、 Figure 16 、 Figure 17 、 Figure 18 and Figure 19 As shown, for the road slab segment 2 in the arch foot area, the posture of the road slab segment 2 is adjusted, and the boom 4 of the truck crane 3 is adjusted so that the road slab segment 2 is rotated out of the space above the arch rib 5, specifically including: 401: Adjust the boom 4 of the truck crane 3 to lift the track slab segment 2 to above the arch rib 5; 402: manually pulling the guy rope to rotate the attitude of the track plate segment 2 from the longitudinal bridge direction to the transverse bridge direction; 403 : Rotate the boom 4 of the mobile crane 3 until the track plate segment 2 is rotated out of the space above the arch rib 5 .
[0045] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.
[0046] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.
[0047] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.
Claims
1. A method for dismantling concrete sidewalk slabs of a tied arch bridge under restricted conditions, characterized in that: It includes the following steps: Using a straight line parallel to the transverse bridge direction and passing through the suspender (1) as a dividing line, the sidewalk slab is divided into blocks along the longitudinal bridge direction to obtain a plurality of slab segments (2); According to the location of the road plate segments (2), all road plate segments (2) are divided into road plate segments (2) in the arch foot area and road plate segments (2) in the boom area; Setting a lifting point on the road slab segment (2) and lifting the lifting point using a truck crane (3); For the road plate segment (2) in the boom area, the posture of the road plate segment (2) is adjusted, and the boom (4) of the truck crane (3) is adjusted so that the road plate segment (2) is rotated out from the space between the two adjacent booms (1); This is done in the same way to complete the removal of all the road slab segments (2) in the boom area; For the road plate segment (2) in the arch foot area, the posture of the road plate segment (2) is adjusted, and the boom (4) of the truck crane (3) is adjusted so that the road plate segment (2) is rotated out of the space above the arch rib (5); The same process is repeated to complete the removal of all the road slab segments (2) in the arch foot area.
2. The method for dismantling the concrete sidewalk slab of a tied arch bridge under restricted conditions as claimed in claim 1, characterized in that: The method further comprises: The sidewalk slab is divided into blocks along the transverse direction of the bridge, so that a plurality of sidewalk slab segments (2) distributed along the transverse direction of the bridge are provided between two adjacent hangers (1).
3. The method for dismantling the concrete sidewalk slab of a tied arch bridge under restricted conditions as claimed in claim 1, characterized in that: After dividing the sidewalk slab into blocks, the method further comprises: Clean the joints of the sidewalk slabs.
4. The method for dismantling the concrete sidewalk slab of a tied arch bridge under restricted conditions as claimed in claim 1, characterized in that: Before dividing the sidewalk slab into blocks, the method further includes: Remove the railing (6) and disconnect the steel bars of the ground cover (7).
5. The method for dismantling concrete sidewalk slabs of a tied arch bridge under restricted conditions as claimed in claim 1, characterized in that: The lifting points are set on the road slab segment (2), specifically including: Opening a lifting hole (8) on the track plate segment (2); A suspension bar (9) is provided at the bottom of the road plate segment (2); Insert one end of the steel wire rope (10) into the hoisting hole (8) and fasten the hoisting rod (9); The other ends of the steel wire ropes (10) are connected to form the suspension point.
6. The method for dismantling a concrete sidewalk slab of a tied arch bridge under restricted conditions as claimed in claim 1, characterized in that: After being transferred out, it is loaded onto a flatbed truck (11) for transportation.
7. The method for dismantling a concrete sidewalk slab of a tied arch bridge under restricted conditions as claimed in claim 1, characterized in that: For the road slab segment (2) in the boom area, the boom (4) of the truck crane (3) is driven to extend from the space below the arch rib (5) and lift the lifting point of the road slab segment (2).
8. The method for dismantling a concrete sidewalk slab of a tied arch bridge under restricted conditions as claimed in claim 1, characterized in that: For a road plate segment (2) in a boom area, adjusting the posture of the road plate segment (2) and adjusting the boom (4) of a truck crane (3) so that the road plate segment (2) is rotated out from the space between two adjacent booms (1) includes: By manually pulling the cable wind rope, the posture of the road plate segment (2) is rotated from the longitudinal bridge direction to the transverse bridge direction; The boom (4) of the vehicle crane (3) is retracted and rotated, and the road plate segment (2) is rotated in coordination therewith until the road plate segment (2) is rotated out of the space between the two adjacent booms (1).
9. The method for dismantling a concrete sidewalk slab of a tied arch bridge under restricted conditions as claimed in claim 1, characterized in that: For the road slab segment (2) in the boom area, the boom (4) of the truck crane (3) is driven to extend from the space above the arch rib (5) and lift the lifting point of the road slab segment (2).
10. The method for dismantling a concrete sidewalk slab of a tied arch bridge under restricted conditions as claimed in claim 1, characterized in that: For the road slab segment (2) in the arch foot area, the posture of the road slab segment (2) is adjusted, and the boom (4) of the truck crane (3) is adjusted so that the road slab segment (2) is rotated out from the space above the arch rib (5), specifically including: Adjusting the boom (4) of the truck crane (3) to lift the road slab segment (2) to above the arch rib (5); By manually pulling the cable wind rope, the posture of the road plate segment (2) is rotated from the longitudinal bridge direction to the transverse bridge direction; The boom (4) of the truck crane (3) is rotated until the track plate segment (2) is rotated out of the space above the arch rib (5).