River-crossing T-shaped rigid frame bridge dismantling construction method

Abstract

The invention discloses a river-crossing T-shaped rigid frame bridge demolition construction method which comprises the steps that cutting construction of a T-shaped rigid frame bridge is completed through rope saw cutting, and an auxiliary construction platform is erected in advance before cutting construction; the T-shaped rigid frame bridge is provided with a bridge main body and a plurality of bridge piers, the auxiliary construction platform comprises a platform body which is used for blocking and protecting the bottom of the bridge main body and can be used for driving, and the platform body is arranged and located under the bridge main body in the length direction of the bridge main body. The edges of the two transverse sides of the platform body respectively outwards exceed the edges of the corresponding sides of the bridge main body by a set distance; the auxiliary construction platform further comprises towers correspondingly arranged over the piers, and the towers are connected with the platform body through stay cables. According to the construction method, the navigation requirement of the bridge bottom can be met, meanwhile, the influence on the river water area is small, the influence on the surrounding environment and the dependency are small, and the dismantling construction efficiency of the bridge can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to a method for dismantling a river-spanning T-shaped rigid frame bridge. Background Art

[0002] The T-type rigid frame bridge is a beam bridge with cantilever stress characteristics. It is named because the cantilevers extend from the piers on both sides, which is similar to the letter T. Some bridges need to be demolished due to quality defects, changes in usage functions, and re-planning of the road network. The segmented demolition of bridges by rope sawing does not produce dust, has low noise, and has little impact on the surrounding environment. It is a common demolition method for urban bridge demolition construction. At present, the rope sawing of T-type rigid frame bridges across rivers is generally completed by directly cooperating with ship cranes to complete the cutting construction and transportation. Since it is inevitable that broken stones will fall during the cutting and demolition construction process, the navigation safety cannot be guaranteed for bridges with navigation requirements at the bottom of the bridge. At the same time, the transportation efficiency of the ship crane transfer method is low, especially for some large-span bridges. In addition, the sewage in the rope sawing process will be directly discharged into the river, which will affect the river environment. Therefore, how to ensure the navigation requirements at the bottom of the bridge during the demolition construction stage, reduce the pollution of the river by cutting construction, and improve the construction efficiency have become technical problems that need to be solved. Summary of the invention

[0003] In view of this, the purpose of the present invention is to provide a method for dismantling a T-shaped rigid frame bridge across a river, which can ensure the navigation requirements at the bottom of the bridge, while having little impact on the river water area and being conducive to improving the efficiency of the bridge dismantling construction.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a method for dismantling a T-shaped rigid frame bridge across a river, which uses a rope saw to complete the cutting construction of the T-shaped rigid frame bridge, and an auxiliary construction platform is pre-erected before the cutting construction; wherein, the T-shaped rigid frame bridge comprises a bridge body and a plurality of bridge piers, and the auxiliary construction platform comprises a platform body used to form a shield for the bottom of the bridge body and can be used for driving, the platform body is arranged along the length direction of the bridge body and is located directly below the bridge body, and the lateral side edges of the platform body respectively extend outwardly beyond the corresponding side edges of the bridge body by a set distance; the auxiliary construction platform also comprises a tower frame correspondingly arranged directly above each bridge pier, and the tower frame is connected to the platform body by an inclined cable.

[0005] Further, the rope saw cutting construction of the T-shaped rigid frame bridge includes the following steps:

[0006] S1: Site survey and cutting and marking;

[0007] S2: Preparation of lifting equipment, cutting equipment, and transfer vehicle, where the transfer vehicle is located on the platform body;

[0008] S3: The cutting of the bridge body is completed in sequence according to the cutting lines, wherein the cut blocks obtained each time are hoisted onto the transfer vehicle by hoisting equipment.

[0009] Furthermore, each of the piers is provided with a pier clamp, and the pier clamp is provided with a platform support part for supporting the platform body, and the platform body is supported and fixed on the platform support part.

[0010] Furthermore, the platform body includes two groups of longitudinal main beams, a plurality of supporting cross beams arranged on the top of the two groups of longitudinal main beams, and a platform panel fixedly laid on the top of the supporting cross beams to form a road surface. The longitudinal main beams are fixedly erected on the platform support part at the pier position, and the oblique cables are fixedly connected to the longitudinal main beams.

[0011] Furthermore, the platform support portion includes two groups of bottom support beams fixedly mounted on the top of the pier clamp, and the two groups of bottom support beams are respectively located on both sides of the pier in the length direction of the bridge body, and the length of the bottom support beam is equal to the width of the platform body.

[0012] Furthermore, the longitudinal main beams are Bailey frames spliced ​​together.

[0013] Furthermore, the supporting beam is an I-beam.

[0014] Furthermore, the platform panel is a steel plate.

[0015] Furthermore, hard guardrails are fixedly provided on both lateral edges of the platform body.

[0016] Furthermore, drainage grooves are provided on both lateral edges of the platform body.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The construction method provided by the present invention can ensure the navigation demand under the bridge, and at the same time has little impact on the river water area, little impact and dependence on the surrounding environment, and can be beneficial to improving the efficiency of bridge demolition construction; specifically, through the pre-erected auxiliary construction platform in the present application, it can form an effective protection for the bridge bottom, avoid the risk of solid, liquid and other wastes falling into the river during the cutting construction process, thereby not affecting the navigation demand under the bridge during the construction stage, and ensuring navigation safety; the tower and inclined cables set up can effectively ensure the bearing strength of the platform body and the driving demand of the platform, and the cut blocks cut off the bridge body can be quickly transported away on the auxiliary construction platform by transport vehicles, which effectively improves the transportation efficiency compared with traditional ship cranes. The overall cutting construction efficiency is improved; the tower is set just above each pier and will not affect the normal cutting of the bridge body, and the cutting of the bridge body will not affect the structural stability of the overall structure; at the same time, there is no need to build a supporting foundation for the auxiliary construction platform in the river channel, which can ensure the construction efficiency of the auxiliary construction platform. The solid and liquid wastes in the cutting construction process fall on the top surface of the platform body, which can be used for subsequent collection and centralized treatment, and will not cause pollution to the river water area, and the impact on the river water area is small; of course, the rope saw cutting construction method adopted is easy to use, has low construction noise, low construction dust, and low impact and dependence on the surrounding environment; this construction method is particularly suitable for the construction of large-span T-shaped steel member bridges across rivers in urban areas.

[0019] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the main structure of an embodiment of the present invention

[0021] Figure 2 A schematic diagram of a cross-sectional structure of an embodiment of the present invention

[0022] Figure 3 A schematic diagram of a partial structure of a main view of an embodiment of the present invention

[0023] Figure 4 A schematic diagram of an axonometric structure of an embodiment of the present invention

[0024] Figure numerals: 1-bridge body; 2-pier; 3-platform body; 301-longitudinal main beam; 302-supporting crossbeam; 303-platform panel; 4-tower; 401-oblique cable; 5-pier clamp; 501-platform support part; 501a-bottom support beam; 6-hard guardrail; 7-drainage ditch. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. It should be noted that the drawings are only for illustrative purposes, and only represent schematic diagrams, not physical drawings, and cannot be understood as limitations on the present invention; in order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0026] In the following text, unless otherwise specified, the transverse direction refers to the width direction of the bridge body, and the longitudinal direction refers to the length direction of the bridge body.

[0027] See also Figure 1-4In this embodiment, a method for dismantling a T-shaped rigid frame bridge across a river is disclosed, wherein the cutting construction of the T-shaped rigid frame bridge is completed by rope saw cutting, and an auxiliary construction platform is pre-erected before the cutting construction; wherein, the T-shaped rigid frame bridge comprises a bridge body 1 and a plurality of bridge piers 2, and the auxiliary construction platform comprises a platform body 3 for forming a shield for the bottom of the bridge body 1 (i.e., forming a shield for the bottom of the bridge body 1) and for driving, and the platform body 3 is arranged along the length direction of the bridge body 1 and is located directly below the bridge body 1, and the lateral side edges of the platform body 3 respectively extend outwardly beyond the corresponding side edges of the bridge body 1 by a set distance, which can be understood as the width of the platform body 3 is greater than the width of the bridge body 1; it can be understood that , the value of "set distance" here at least needs to ensure that the transfer vehicle can pass through the pier 2; by setting a wider platform body 3, effective protection for the bottom of the bridge body 1 is formed; the auxiliary construction platform also includes a tower 4 correspondingly arranged directly above each pier 2, and the tower 4 is connected to the platform body through an inclined cable 401. By setting the tower 4 and the inclined cable 401, the bearing capacity of the platform body 3 can be effectively guaranteed, thereby ensuring the driving and carrying function of the platform body 3; of course, it can be understood that the longitudinal ends of the platform body 3 can be built on the supporting foundation of the bridge head construction; the construction method provided above can ensure the navigation needs of the bridge bottom, and at the same time has little impact on the river water area, and has little impact on the surrounding environment and dependence. The utility model has the advantages of small size and can be helpful to improve the efficiency of bridge demolition construction; specifically, the auxiliary construction platform set up in advance can form an effective protection for the bottom of the bridge, avoid the risk of solid, liquid and other wastes falling into the river during the cutting construction process, thereby not affecting the navigation demand of the bottom of the bridge during the construction stage, and ensuring the safety of navigation; the tower frame 4 and the inclined cable 401 set up can effectively ensure the bearing strength of the platform body 3 and the driving demand of the platform, and the cutting blocks cut off from the bridge body 1 can be quickly transported away on the auxiliary construction platform by transport vehicles, which effectively improves the overall cutting construction efficiency compared with the traditional ship crane transportation; the tower frame 4 is set just above each pier 2 and will not affect the normal cutting of the bridge body 1, and the cutting of the bridge body 1 will not affect the whole The structural stability of the main structure; at the same time, there is no need to build a supporting foundation for the auxiliary construction platform in the river channel, which can ensure the construction efficiency of the auxiliary construction platform. The solid and liquid wastes in the cutting construction process can be collected and processed in a centralized manner after falling on the top surface of the platform body 3, which will not pollute the river water area and has little impact on the river water area; of course, the rope saw cutting construction method adopted is easy to use, has low construction noise and dust, and has little impact and dependence on the surrounding environment; this construction method is particularly suitable for the construction of large-span T-shaped steel member bridges across rivers in urban areas; of course, the erected auxiliary construction platform can be used as a temporary construction facility and material (air compressor, electric box, work tools, a small amount of raw materials, etc.) stacking to improve construction convenience.

[0028] In this embodiment, the rope saw cutting construction of the T-shaped rigid frame bridge includes the following steps:

[0029] S1: On-site investigation and cutting and marking, including: understanding the specific structural form of the bridge, such as the materials and structures of the main beam, piers, bridge deck pavement, etc.; investigating and understanding the use history, maintenance records and current conditions of the bridge, and formulating a cutting route suitable for the current bridge, etc. This part is consistent with the preliminary investigation and marking process of existing bridge wire saw cutting, so it will not be repeated here;

[0030] S2: Preparation of lifting equipment, cutting equipment, and transfer vehicle, wherein the transfer vehicle is located on the platform body 3. Specifically, the lifting equipment here can be a ship crane, or a car crane installed on the platform body 3, or a gantry crane set up on the bridge body 1, etc. The cutting equipment generally uses a diamond wire saw. Before cutting, ensure the stable lifting of the cutting block to ensure the safety of construction; after the cutting block is cut, it can be directly lifted onto the transport vehicle on the platform body 3 and transported by the transport vehicle without affecting the subsequent construction; here, the preparation of the lifting equipment and the preparation of the cutting equipment can be consistent with the preparation process of the existing wire saw cutting equipment, which will not be repeated here;

[0031] S3: The cutting of the bridge body 1 is completed in sequence according to the cutting lines, wherein the cut blocks cut each time are hoisted onto the transfer vehicle by hoisting equipment; the cutting process can be consistent with the existing cutting process, the difference is that, in this solution, the cut blocks after cutting can be directly transferred by the transfer vehicle on the platform body 3, which greatly improves the transfer efficiency and safety, thereby facilitating the improvement of the overall construction progress.

[0032] In this embodiment, each of the piers 2 is provided with a pier clamp 5, and the pier clamp 5 is provided with a platform support part 501 for supporting the platform body 3, and the platform body 3 is supported and fixed on the platform support part 501; here, the pier clamp 5 adopts the existing steel pier clamp, and the pier clamp of corresponding specifications is selected according to the bearing capacity, strength requirements and pier size; the platform support part 501 is generally a support beam; the platform support part 501 can be an integral structure with the pier clamp, and of course the platform support part 501 can also be a welded fixed structure with the pier clamp; the platform body 3 can be welded and fixed to the platform support part 501; by arranging the pier clamp 5 at the position of the pier 2, it is beneficial to further enhance the structural stability and bearing capacity of the platform body 3, thereby further improving the construction safety.

[0033] In this embodiment, the platform body 3 includes two groups of longitudinal main beams 301, multiple supporting beams 302 arranged on the top of the two groups of longitudinal main beams 301, and a platform panel 303 fixedly laid on the top of the supporting beams 302 to form a road surface. The longitudinal main beams 301 are fixedly erected on the platform support part 501 at the position of the pier 2, and the inclined cables 401 are fixedly connected to the longitudinal main beams 301; it can be understood that the inclined cables 401 are arranged in multiple numbers, and the specific installation and connection method of the inclined cables 401 is the existing technology, which will not be repeated here; the platform body 3 in this structural design has a simple structure, good strength, and good bearing capacity, which is conducive to ensuring safety in use and convenience in construction.

[0034] In this embodiment, the platform support part 501 includes two groups of bottom support beams 501a fixedly arranged on the top of the pier clamp 5, and the two groups of bottom support beams 501a are respectively located on both sides of the pier 2 in the length direction of the bridge body 1, and the length of the bottom support beam 501a is equal to the width of the platform body 1; here, the support beam 501a adopts an I-beam, which is welded and fixed to the pier clamp 5; the platform support part 501 in this structural design has a simple structure and a good supporting effect on the platform body 1, which is conducive to further improving the structural stability and safety of use of the platform body 1.

[0035] In this embodiment, the longitudinal main beam 301 is a Bailey frame spliced ​​together. The Bailey frame is a steel frame that forms a certain unit and has the characteristics of simple structure, convenient transportation, fast erection, and easy disassembly. It also has the advantages of large bearing capacity, strong structural rigidity, and long fatigue life. The longitudinal main beam 301 spliced ​​by the Bailey frame has good construction convenience, large bearing capacity, and strong structural rigidity.

[0036] In this embodiment, the supporting cross beam 302 is an I-beam. When specifically arranged, the I-beams are evenly spaced at a certain distance. The I-beams have good bearing capacity, which is beneficial to ensuring the stability and safety of the platform body.

[0037] In this embodiment, the platform panel 303 is a steel plate. When laying, the platform panel 303 is made of multiple steel plates spliced ​​together, and the joints can be simply sealed with waterproof glue; using steel plates as panels has good bearing capacity, which is conducive to ensuring the stability and safety of the platform body.

[0038] In this embodiment, hard guardrails 6, such as steel pipe fences, are fixedly provided on both lateral edges of the platform body 3. By providing the hard guardrails 6, the edge positions of the platform body can be protected, which is beneficial to further improve construction safety.

[0039] In this embodiment, drainage grooves 7 are provided on both lateral edges of the platform body 3. Specifically, the drainage grooves 7 can be integrated on the platform panel 303. By arranging the drainage grooves 7 on both sides, sewage generated by the cutting construction can be discharged through the drainage grooves 7 to the set sewage treatment equipment and then discharged after treatment, which is conducive to the collection and discharge of sewage.

[0040] The platform body 3 in the above structural design can be constructed according to the following process: construct the tower 4, which is in the form of steel column + truss; install the inclined cable 401, which is generally composed of closed steel cable or solid steel bar; install the longitudinal main beam 301 of the auxiliary construction platform and reinforce it, the longitudinal main beam 301 is firmly connected with the inclined cable 401, and the longitudinal main beam 301 adopts Bailey frame structure; when the longitudinal main beam 301 passes through the pier 2, it is attached to the pier 2 by the pier clamp 5 to enhance stability; install the auxiliary construction platform support beam 302 and reinforce it, and the support beam 302 adopts I-beam; lay the platform panel 303, and the platform panel 303 adopts steel plate; install and reinforce the hard guardrails 6 on both sides; pre-press and inspect the auxiliary construction platform.

[0041] The auxiliary construction platform mentioned above can also be applied by analogy to the construction of T-shaped rigid frame bridges. During construction, the bridge piers can be constructed first, and then the auxiliary construction platform can be built based on the bridge piers. After the auxiliary construction platform is formed, it can also provide effective protection for the bottom of the bridge and improve construction safety. Similarly, for T-shaped rigid frame bridges across rivers, canyons, etc., the auxiliary construction platform in this application can also be used for demolition or construction.

[0042] Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A method for dismantling a T-shaped rigid frame bridge across a river, characterized in that: The cutting construction of the T-shaped rigid frame bridge was completed by using a rope saw, and an auxiliary construction platform was pre-built before the cutting construction; The T-shaped rigid frame bridge comprises a bridge body (1) and a plurality of bridge piers (2); the auxiliary construction platform comprises a platform body (3) used to form a shield for the bottom of the bridge body (1) and can be used for driving; the platform body (3) is arranged along the length direction of the bridge body (1) and is located directly below the bridge body (1); and the lateral side edges of the platform body (3) respectively extend outwards beyond the corresponding side edges of the bridge body (1) by a set distance; The auxiliary construction platform also includes a tower (4) correspondingly arranged directly above each pier (2), and the tower (4) is connected to the platform body via an inclined cable (401).

2. The method for dismantling a river-crossing T-shaped rigid frame bridge according to claim 1 is characterized in that: The rope saw cutting construction of the T-shaped rigid frame bridge includes the following steps: S1: Site survey and cutting and marking; S2: preparation of lifting equipment, cutting equipment, and transfer vehicle, wherein the transfer vehicle is located on the platform body (3); S3: Cutting of the bridge body (1) is completed in sequence according to the cutting lines, wherein the cut blocks obtained each time are hoisted onto a transfer vehicle by a hoisting device.

3. The method for dismantling a river-crossing T-shaped rigid frame bridge according to claim 1 is characterized in that: Each of the bridge piers (2) is provided with a bridge pier clamp (5), and the bridge pier clamp (5) is provided with a platform support portion (501) for supporting the platform body (3), and the platform body (3) is supported and fixed on the platform support portion (501).

4. The method for dismantling a river-crossing T-shaped rigid frame bridge according to claim 3 is characterized in that: The platform body (3) comprises two groups of longitudinal main beams (301), a plurality of supporting cross beams (302) arranged on the top of the two groups of longitudinal main beams (301), and a platform panel (303) fixedly laid on the top of the supporting cross beams (302) and forming a road surface. The longitudinal main beams (301) are fixedly erected on the platform support part (501) at the pier (2), and the inclined cables (401) are fixedly connected to the longitudinal main beams (301).

5. The method for dismantling a river-crossing T-shaped rigid frame bridge according to claim 3 is characterized in that: The platform support portion (501) comprises two groups of bottom support beams (501a) fixedly arranged on the top of the pier clamp (5), and the two groups of bottom support beams (501a) are respectively and correspondingly located on both sides of the pier (2) in the length direction of the bridge body (1), and the length of the bottom support beams (501a) is equal to the width of the platform body (1).

6. The method for dismantling a river-crossing T-shaped rigid frame bridge according to claim 4 is characterized in that: The longitudinal main beams (301) are Bailey frames formed by mutually splicing.

7. The method for dismantling a river-crossing T-shaped rigid frame bridge according to claim 4 is characterized in that: The supporting crossbeam (302) is an I-beam.

8. The method for dismantling a river-crossing T-shaped rigid frame bridge according to claim 4 is characterized in that: The platform panel (303) is a steel plate.

9. The method for dismantling a river-crossing T-shaped rigid frame bridge according to claim 1, characterized in that: Hard guardrails (6) are fixedly provided on both lateral edges of the platform body (3).

10. The method for dismantling a river-crossing T-shaped rigid frame bridge according to claim 1, characterized in that: Drainage grooves (7) are provided at both lateral edges of the platform body (3).

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