Cantilever gantry

Abstract

The present invention relates to a cantilever gantry, comprising: a gantry foundation composed of steel pipe columns arranged on a fixed surface, two load-bearing beams arranged on the top of the steel pipe columns and two parallel gantry rails respectively arranged on the two load-bearing beams, two supporting structures connected to the fixed surface at one end and to the top of the steel pipe columns at the other end and located outside the gantry frame, and a lifting device arranged on the two gantry rails and sliding on the gantry rails, one end of the load-bearing beam extending out of the vertical projection surface of the steel pipe columns to form a cantilever. The cantilever gantry is constructed by adopting a steel pipe column structure, which has a simple structure, is easy to operate, and reduces the difficulty of construction. At the same time, the diagonal brace can support the cantilever gantry, so that the cantilever gantry has a certain supporting force during the lifting of the beam rods and the movement of the beam rods on the bridge deck, and is not prone to overturning. No large space needs to be reserved on the bridge deck for the construction of the cantilever gantry, which improves construction efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, in particular to a cantilever portal frame. Background Art

[0002] Existing bridges assembled from separate steel beams require mechanisms to lift steel beam components, such as high-low leg gantries, tower cranes, and cantilever lifting systems. High-low leg gantries require steel pipe pile foundations, and the gantry crane's high legs are nearly 45 meters tall, resulting in high safety risks during component lifting. Long-span gantry cranes have high performance requirements for the main beam and are heavy, requiring large lifting equipment for installation and removal. This is inconvenient for installation on cable-tower bridges and poses significant risks to the cable-tower bridge structure. The tower crane must be erected higher than the top of the cable tower and requires a separate steel pipe pile foundation. Other structures are also required to ensure the crane's stability, resulting in high crane costs. Existing cantilever lifting systems, which lift bridge components by installing a cantilever lifting system on the side of the bridge, are complex structures and require a large space on the bridge deck. These cantilever lifting systems require the construction of long sections before the lifting system can be installed, increasing construction difficulty and costs and reducing efficiency. Summary of the Invention

[0003] In order to overcome the above technical problems, especially the complex structure of the cantilever lifting system, the large space required for construction on the bridge deck, which increases the construction difficulty and cost and reduces the construction efficiency, the following technical solutions are proposed:

[0004] An embodiment of the present application provides a cantilever gantry, comprising: a gantry base composed of steel pipe columns arranged on a fixed surface, two load-bearing beams arranged on the top of the steel pipe columns and two parallel gantry rails respectively arranged on the two load-bearing beams, two supporting structures connected to the fixed surface at one end and the top of the steel pipe columns at the other end and located on the outside of the gantry frame, and a lifting equipment arranged on the two gantry rails and sliding on the gantry rails, wherein one end of the load-bearing beam extends out of the vertical projection surface of the steel pipe columns to form a cantilever.

[0005] Optionally, the ratio of the distance from the farthest lifting point on the gantry track to the axis of the fixing surface to the distance from the edge of the fixing surface to the axis of the fixing surface is 2:1.

[0006] Optionally, both ends of the gantry track are provided with limiting structures for limiting the lifting equipment from moving out of the gantry track.

[0007] Optionally, the limiting structure is a block provided at both ends of the portal track.

[0008] Optionally, the load-bearing beam located on the fixed surface is supported by the steel pipe column perpendicular to the fixed surface, and the cantilever load-bearing beam is supported by the inclined steel pipe column.

[0009] Optionally, the steel pipe column is fixedly connected to the fixing surface.

[0010] Optionally, the load-bearing beam is made of an I-beam, wherein the I-beam comprises an upper flange, wherein the upper flange of the I-beam is provided with a steel plate, and the thickness of the steel plate is 19-21 mm.

[0011] Optionally, the gantry rail adopts P43 heavy rail, and the ratio of the distance between the two gantry rails to the length of the hoisted rod is in the range of: 2.4-6.5.

[0012] Optionally, the position of the support structure on the fixing surface does not affect the translational rotation of the rod under the portal frame, and the support structure is made of 28a channel steel.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The cantilever gantry provided in the embodiment of the present application includes: a gantry foundation composed of steel pipe columns arranged on a fixed surface, two load-bearing beams arranged on the top of the steel pipe columns and two parallel gantry rails respectively arranged on the two load-bearing beams, two supporting structures connected to the fixed surface at one end and to the top of the steel pipe columns at the other end and located outside the gantry frame, and a lifting device arranged on the two gantry rails and sliding on the gantry rails, one end of the load-bearing beam extending out of the vertical projection surface of the steel pipe columns to form a cantilever. The cantilever gantry is constructed by using a steel pipe column structure, which has a simple structure and is easy to operate. At the same time, the diagonal brace can support the cantilever gantry so that the cantilever gantry has a certain supporting force during the lifting of the beam members and the movement of the beam members on the bridge deck, and is not prone to overturning. The cantilever gantry has a simple structure, reduces construction difficulty, saves construction costs, and does not require a large space to be reserved on the bridge deck for the construction of the cantilever gantry, thereby improving construction efficiency.

[0015] The cantilever gantry provided in the embodiment of the present application has limiting structures at both ends of the track for limiting the flat car from moving out of the gantry track. The limiting structures are used to limit the farthest starting point of the lifting equipment and the end point of the lowering beam of the lifting equipment, so as to avoid the lifting point being too far away and ensure that the cantilever gantry is subjected to unbalanced force, which may cause the cantilever end of the cantilever gantry to break or the cantilever gantry to overturn.

[0016] The cantilever gantry provided in the embodiment of the present application has a load-bearing beam on the bridge deck supported by a steel pipe column perpendicular to the fixed surface, and the load-bearing beam of the cantilever is supported by an inclined steel pipe column. Both the vertical and inclined steel pipe columns can transfer the force borne by the cantilever gantry to the fixed surface, thereby improving the stability of the cantilever gantry; the steel pipe column is fixedly connected to the fixed surface, thereby ensuring that the connection is tighter and stronger, so as to ensure the safety and stability of the cantilever gantry.

[0017] The cantilever gantry provided in the embodiment of the present application has a support structure arranged at a position on the fixed surface that does not affect the horizontal rotation of the rod under the gantry. Since the beam rod is lifted from the side of the fixed surface to achieve beam feeding, the beam rod is parallel to the side edge of the fixed surface. In order to ensure that the beam rod does not cause damage to other structures on the fixed surface during transportation to the installation position, and to minimize the clearance of the fixed surface to improve construction efficiency and ensure safety during transportation, the beam rod needs to be rotated after being lifted above the height of the fixed surface. Therefore, the position of the support structure will not hinder the rotation of the beam rod, so that the beam rod can be rotated into place.

[0018] Additional aspects and advantages of the present invention will be set forth in part in the following description, will be obvious from the following description, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0020] Figure 1 This is a schematic diagram of the structure of the cantilever gantry on the bridge deck along the bridge direction of the present invention;

[0021] Figure 2 Figure 1 The middle is a schematic diagram of the structure of the cantilever gantry viewed from the left;

[0022] Figure 3 Figure 1 The middle is a schematic diagram of the structure of the cantilever gantry when viewed from above. DETAILED DESCRIPTION

[0023] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0024] Those skilled in the art will appreciate that, unless otherwise stated, the singular forms "a," "an," "said," and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of features, integers, steps, and operations, but does not preclude the presence or addition of one or more other features, integers, steps, and operations.

[0025] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0026] The embodiment of the present application provides a cantilever gantry, such as Figure 1 As shown, it includes: a gantry foundation composed of a steel pipe column 101 arranged on a fixed surface 1, two load-bearing beams 102 arranged on the top of the steel pipe column 101, and two parallel gantry rails 103 respectively arranged on the two load-bearing beams 102, two supporting structures 104 connected to the fixed surface 1 at one end and connected to the top of the steel pipe column 101 at the other end and located on the outside of the gantry frame, and a lifting device 105 arranged on the two gantry rails and sliding on the gantry rails, and one end of the load-bearing beam 102 extends out of the vertical projection surface of the steel pipe to form a cantilever. In the embodiment provided in the present application, the fixed surface includes the bridge deck, and the cantilever gantry is installed on the bridge deck to realize feeding the beam from the side of the bridge. In the embodiment provided in the present application, the cantilever gantry is constructed using the steel pipe column 101 structure, which is simple in structure and easy to operate. The load-bearing beam 102 is primarily responsible for bearing the force transmitted to it by the lifting equipment 105 during lifting, and transferring this force to the fixed surface via the steel pipe column 101. The support structure 104 is located outside the gantry foundation, ensuring that the cantilever gantry has sufficient support during the lifting and movement of the beam members on the bridge deck, thereby preventing the gantry from tipping over. The gantry track 103 is used by the lifting equipment 105 to lift the beam members. Once lifted above the bridge deck, the lifting equipment 105 slides onto the gantry track 103 onto the bridge deck to transport the beam members to their installation location.

[0027] Alternatively, as Figure 3As shown, both ends of the gantry track 103 are provided with limiting structures 106 for limiting the movement of the lifting equipment out of the gantry track. Optionally, the limiting structures 106 are blocks provided at both ends of the gantry track 103. The limiting structures 106 are used to limit the farthest starting point of the lifting equipment and the end point of the beam rod for lowering the lifting equipment, so as to avoid excessive bending moment on the cantilever gantry caused by a lifting point that is too far away, thereby causing the cantilever end of the cantilever gantry to break or the cantilever gantry to overturn. Therefore, the limiting structure 106 can ensure that the positions of the lifting point and the lowering point of the lifting equipment are within the allowable range, and ensure the stability of the lifting equipment during the lifting and lowering process.

[0028] It should be noted that if Figure 1 As shown, in the embodiment provided in this application, in order to ensure the stability of the cantilever hanger and prevent the cantilever gantry from overturning during the process of lifting the rod by the lifting equipment, optionally, the ratio of the distance from the farthest lifting point on the gantry track 103 to the axis of the fixed surface 1 to the distance from the edge of the fixed surface to the axis is 2:1. Optionally, the gantry track 103 uses P43 heavy rails, and the ratio of the distance between the two gantry tracks 103 to the length of the hoisted rod is in the range of 2.4-6.5. In one embodiment, optionally, the standard length of the side main beam of the bridge segment is 11.7m, the bottom plate width is 1.1 to 1.92m, and the maximum weight after adding the anchor plate is 34.87t; the crossbeam dimensions are 29×0.7×2.82m, and the maximum lifting weight is 22.5t; the maximum dimensions of the bridge deck are 7.25m×3.40m, and the plane dimensions after including the steel bars are 7.69m×4.34m, and the maximum weight is 20.6t. The distance from the farthest lifting point to the bridge deck axis is 30m, the spacing between the gantry rails is 6.8m, and the wheel spacing of the flat car used to move the lifting equipment in front of the gantry rails is 1.5m. The flat car is used to slide on the gantry rails 103.

[0029] In the examples provided in this application, Figure 1As shown, the load-bearing beam 102 located on the fixed surface 1 is supported by a steel pipe column 101 perpendicular to the fixed surface, and the cantilever load-bearing beam 102 is supported by an inclined steel pipe column 101. Therefore, the steel pipe column 101 includes a steel pipe column perpendicular to the fixed surface and an inclined steel pipe column at an angle to the fixed surface. The inclined steel pipe column 101 can support the cantilever end of the middle load-bearing beam 102 of the cantilever gantry, so that the cantilever gantry has a certain supporting force during the lifting of the beam rod and the movement of the beam rod on the bridge deck, and is not prone to overturning. In one embodiment, during the construction of the bridge deck wet joint and cast-in-place slab, the cantilever gantry foundation embedded parts are pre-embedded in advance and welded to the steel beam. The length and thickness of the weld meet the requirements of the specification. The steel pipe column, diagonal brace, load-bearing beam and overhead crane are installed in sequence using a tower crane and a side span bridge crane. Among them, the steel pipe column is fixedly connected to the fixed surface to ensure that the connection between the cantilever gantry and the bridge deck is tight and strong. In the embodiment provided in the present application, when the cantilever gantry is constructed based on the steel pipe column, the cantilever gantry is able to bear weight, the structure is simple, the construction difficulty is reduced, the construction cost is saved, and there is no need to reserve a large space on the bridge deck for the construction of the cantilever gantry, thereby improving construction efficiency.

[0030] In the embodiment provided in this application, in order to ensure that the cantilever gantry can bear a large weight, the load-bearing beam is optionally made of 56a I-beam, and the axial direction of the load-bearing beam is perpendicular to the direction of the bridge, so that the cantilever gantry can extend out of the bridge deck and realize side beam feeding. The I-beam includes an upper flange, and the upper flange of the I-beam is provided with a steel plate with a thickness of 19-21mm. Optionally, the thickness of the steel plate is 20mm, which ensures that the load-bearing beam can bear a large weight, so that the rods lifted by the lifting equipment can be smoothly transported to the bridge.

[0031] In the embodiment provided in the present application, since the fixed surface includes the bridge deck, when the cantilever gantry is erected on the bridge deck, the beam rod is lifted from the side of the bridge to feed the beam, so the beam rod is parallel to the side edge of the bridge. In order to ensure that the beam rod does not cause damage to other structures on the fixed surface during transportation to the location to be installed, and to minimize the clearance of the fixed surface to improve construction efficiency and ensure safety during transportation, the beam rod needs to be rotated after it is lifted above the bridge deck height. Optionally, as Figure 1-Figure 3As shown, the position of the support structure 104 on the fixed surface does not affect the horizontal rotation of the rod under the portal frame. The position of the support structure 104 does not hinder the rotation of the beam member. The support structure 104 is hinged to the fixed surface 1, so that when the position of the support structure 104 hinders the rotation of the beam member, the support structure can be disassembled and rotated in time to achieve the rotation of the beam member. Among them, two support structures 104 are provided at the tail of the cantilever portal frame. The two support structures 104 are tie rods. In order to ensure that the support structure 104 can support the foundation of the steel pipe column 101 to the greatest extent, while also saving material costs, reducing the pressure of the steel structure's own weight on the bridge deck, and facilitating the transportation and installation of the support structure, the support structure 104 is made of 28a channel steel.

[0032] In summary, the cantilever gantry provided by this application has the following beneficial effects:

[0033] The cantilever gantry provided in the embodiment of the present application includes: a gantry foundation composed of steel pipe columns arranged on a fixed surface, two load-bearing beams arranged on the top of the steel pipe columns and two parallel gantry rails respectively arranged on the two load-bearing beams, two supporting structures connected to the fixed surface at one end and to the top of the steel pipe columns at the other end and located outside the gantry frame, and a lifting device arranged on the two gantry rails and sliding on the gantry rails, one end of the load-bearing beam extending out of the vertical projection surface of the steel pipe columns to form a cantilever. The cantilever gantry is constructed by using a steel pipe column structure, which has a simple structure and is easy to operate. At the same time, the diagonal brace can support the cantilever gantry so that the cantilever gantry has a certain supporting force during the lifting of the beam members and the movement of the beam members on the bridge deck, and is not prone to overturning. The cantilever gantry has a simple structure, reduces construction difficulty, saves construction costs, and does not require a large space to be reserved on the bridge deck for the construction of the cantilever gantry, thereby improving construction efficiency.

[0034] The cantilever gantry provided in the embodiment of the present application is provided with limiting structures at both ends of the track for limiting the flat car from moving out of the gantry track. The limiting structures are used to limit the farthest starting point of the lifting equipment and the end point of the lowering beam rod of the lifting equipment, so as to avoid excessive bending moment on the cantilever gantry caused by a lifting point that is too far away, thereby causing the cantilever end of the cantilever gantry to break or the cantilever gantry to overturn.

[0035] The cantilever gantry provided in the embodiment of the present application has a load-bearing beam on the bridge deck supported by a steel pipe column perpendicular to the fixed surface, and the load-bearing beam of the cantilever is supported by an inclined steel pipe column. Both the vertical and inclined steel pipe columns can transfer the force borne by the cantilever gantry to the fixed surface, thereby improving the stability of the cantilever gantry; the steel pipe column is fixedly connected to the fixed surface, thereby ensuring that the connection is tighter and stronger, so as to ensure the safety and stability of the cantilever gantry.

[0036] In the cantilever gantry provided by the embodiment of the present application, the position of the support structure on the fixed surface does not affect the horizontal rotation of the rod under the gantry. Since the beam rod is lifted from the side of the fixed surface to achieve beam feeding, the beam rod is parallel to the side edge of the fixed surface. In order to ensure that the beam rod does not cause damage to other structures on the fixed surface during transportation to the installation location, while minimizing the clearance of the fixed surface to improve construction efficiency and ensure safety during transportation, the beam rod needs to be rotated after being lifted above the height of the fixed surface. Therefore, the position of the support structure does not hinder the rotation of the beam rod, and the beam rod can be rotated into place.

[0037] The above are only some of the embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A cantilever gantry, characterized in that: include: A gantry foundation composed of a steel pipe column arranged on a fixed surface, two load-bearing beams arranged on the top of the steel pipe column and two parallel gantry rails respectively arranged on the two load-bearing beams, two supporting structures connected to the fixed surface at one end and the top of the steel pipe column at the other end and located on the outside of the gantry frame, and a lifting device arranged on the two gantry rails and sliding on the gantry rails, one end of the load-bearing beam extending out of the vertical projection surface of the steel pipe column to form a cantilever; the supporting structure also includes two channel steels fixed at the tail of the cantilever gantry as pull rods, the channel steels can be disassembled and rotated so that the position of the supporting structure arranged on the fixed surface does not affect the horizontal rotation of the rod under the gantry; The fixed surface includes the bridge deck, and the cantilever gantry is installed on the bridge deck to realize feeding beams from the side of the bridge: when the beam rod is lifted from the side of the bridge to feed the beam, the beam rod is parallel to the side edge of the bridge, and after the beam rod is lifted to above the height of the bridge deck, it is rotated horizontally.

2. The cantilever gantry according to claim 1, characterized in that: The ratio of the distance from the farthest lifting point on the gantry track to the axis of the fixing surface to the distance from the edge of the fixing surface to the axis of the fixing surface is 2:

1.

3. The cantilever gantry according to claim 1, characterized in that: Limiting structures for limiting the lifting equipment from moving out of the gantry track are provided at both ends of the gantry track.

4. The cantilever gantry according to claim 3, characterized in that: The limiting structure is a block arranged at both ends of the door frame track.

5. The cantilever gantry according to claim 1, characterized in that: The load-bearing beam located on the fixed surface is supported by the steel pipe column perpendicular to the fixed surface, and the cantilever load-bearing beam is supported by the steel pipe column arranged obliquely.

6. The cantilever gantry according to claim 1, characterized in that: The steel pipe column is fixedly connected to the fixing surface.

7. The cantilever gantry according to claim 1, characterized in that: The load-bearing beam is made of an I-beam, and the I-beam includes an upper flange. The upper flange of the I-beam is provided with a steel plate, and the thickness of the steel plate is 19-21 mm.

8. The cantilever gantry according to claim 1, characterized in that: The gantry rails are P43 heavy rails, and the ratio of the distance between the two gantry rails to the length of the hoisted rod is in the range of 2.4-6.5.

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