CN111960267A - Cantilever portal - Google Patents

Abstract

The invention relates to a cantilever gantry, comprising: a gantry foundation formed by 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 that are connected to the fixed surface, the other end is connected to the top of the steel pipe column, and are located on the outside of the gantry frame, and the lifting equipment that is arranged on the two gantry tracks and slides on the gantry track, and one end of the load-bearing beam protrudes from the steel pipe column. The vertical projection plane forms a cantilever. The cantilever gantry is constructed by using the steel pipe column structure. The structure is simple, easy to operate, and the construction difficulty is reduced. At the same time, the diagonal bracing can support the cantilever gantry, so that the cantilever gantry can be lifted on the beam and the beam can be installed on the bridge. During the movement of the bridge deck, it has a certain supporting force and is not easy to overturn, and the bridge deck does not need to reserve a large space for the construction of the cantilever gantry, which improves the construction efficiency.

Description

Cantilever gantry

technical field

The invention relates to the technical field of bridge construction, in particular to a cantilever gantry.

Background technique

Existing bridges assembled with steel girder parts need to build a mechanism for lifting steel girder members on the bridge section, such as high and low leg gantry, tower crane and cantilever lifting system. The high and low leg gantry must be set with steel pipe pile foundation, and the height of the high outrigger of the gantry crane is nearly 45m, which leads to high safety risks during the lifting of the components; the large-span gantry crane has high performance requirements and heavy weight on the main beam, and large-scale hoisting must be configured during installation and dismantling. It is inconvenient to install on the cable tower bridge, and it will cause greater risk to the cable tower bridge structure during installation and demolition. The height of the tower crane needs to be higher than the top of the cable tower, and the steel pipe pile foundation needs to be set up separately. At the same time, other structures need to be built to ensure the stability of the tower crane, resulting in high tower crane costs. In the cantilever lifting system in the prior art, the bridge components are lifted by erecting the cantilever lifting system on the side of the bridge. However, the structure adopted by the cantilever lifting system is complex, and the space for building on the bridge deck is large, and the bridge needs to be first The construction of the hoisting system can only be carried out after a longer segment is constructed, which increases the construction difficulty and construction cost, and reduces the construction efficiency.

SUMMARY OF THE INVENTION

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

A cantilever gantry provided in an embodiment of the present application includes: a gantry foundation formed of a steel pipe column disposed on a fixed surface, two load-bearing beams disposed on the top of the steel pipe column, and two load-bearing beams respectively disposed on the two load-bearing beams Two parallel gantry rails, one end is connected to the fixed surface, the other end is connected to the top of the steel pipe column and is located on the outside of the gantry frame. One end of the load-bearing beam protrudes from the vertical projection surface of the steel pipe column to form a cantilever.

Optionally, the ratio of the distance from the farthest lifting point on the gantry track to the axis of the fixed surface and the distance from the edge of the fixed surface to the axis of the fixed surface is 2:1.

Optionally, both ends of the gantry track are provided with limit structures that restrict the lifting equipment from moving to the gantry track.

Optionally, the limiting structure is a stopper provided at both ends of the gantry rail.

Optionally, the load-bearing beam on the fixed surface is supported by the steel pipe column perpendicular to the fixed surface, and the load-bearing beam of the cantilever is supported by the steel pipe column arranged obliquely.

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

Optionally, the load-bearing beam is made of 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.

Optionally, the gantry rails are P43 heavy rails, and the ratio between the distance between the two gantry rails and the length of the rod to be lifted ranges from 2.4 to 6.5.

Optionally, the position where the support structure is arranged on the fixing surface does not affect the horizontal rotation of the rod under the gantry, and the support structure is made of 28a channel steel.

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

The cantilever gantry provided in the embodiment of the present application includes: a gantry foundation formed by 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 respectively arranged on the two load-bearing beams Rails, two supporting structures with one end connected to the fixed surface and the other end connected to the top of the steel pipe column and located on the outside of the gantry frame, and lifting equipment arranged on the two gantry rails and sliding on the gantry rails, one end of the bearing beam extends The vertical projection plane of the pipe column forms a cantilever. The cantilever gantry is constructed by using the steel pipe column structure, which is simple in structure and easy to operate. At the same time, the diagonal bracing can support the cantilever gantry, so that the cantilever gantry can be lifted during the lifting of the beam members and the movement of the beam members on the bridge deck. It has a certain supporting force and is not easy to overturn. The cantilever gantry has a simple structure, which reduces the construction difficulty and saves the construction cost. The bridge deck does not need to reserve a large space for the construction of the cantilever gantry, which improves the construction efficiency.

In the cantilever gantry provided in the embodiment of the present application, the two ends of the track are provided with limit structures that limit the movement of the flat car to the track of the gantry. At the end point, avoid too far lifting points to ensure that the force of the cantilever gantry is unbalanced, which will cause the cantilever end of the cantilever gantry to break, or the cantilever gantry to overturn.

In the cantilever gantry provided in the embodiment of the present application, the load-bearing beam on the bridge deck is supported by the steel pipe column perpendicular to the fixed surface, the cantilevered load-bearing beam is supported by the inclined steel pipe column, and both the vertical and the inclined steel pipe column can support the cantilever door. The force on the frame is transferred to the fixed surface, which improves 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.

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. Because the beam and rod are lifted from the side of the fixed surface to feed the beam, the beam rod The parts are parallel to the side edges of the fixed surface. In order to ensure that the beams and rods will not cause damage to other structures on the fixed surface during transportation to the location to be installed, and at the same time reduce the site clearance on the fixed surface as much as possible to improve construction efficiency. , and to ensure the safety during transportation, after the beam member is raised above the height of the fixed surface, it needs to be rotated, so the setting position of the support structure will not hinder the beam member from rotating, so that the beam member can be rotated in place.

Additional aspects and advantages of the present invention will be set forth in part in the following description, which will be apparent from the following description, or may be learned by practice of the present invention.

Description of drawings

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

Fig. 1 is the structural representation along the bridge direction on the bridge deck in the cantilever gantry of the present invention;

Fig. 2 is the structural schematic diagram of the left-view direction of the cantilever gantry in Fig. 2;

FIG. 3 and FIG. 1 are a schematic structural diagram of the cantilever gantry in the top view direction.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, but not to be construed as a limitation of the present invention.

It will be understood by those skilled in the art that the singular forms "a", "an", "the" and "the" as used herein can include the plural forms as well, unless expressly stated otherwise. It should be further understood that the word "comprising" used in the description of the present invention refers to the presence of features, integers, steps, operations, but does not exclude the presence or addition of one or more other features, integers, steps, operations.

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 one of ordinary skill in the art to which this invention belongs. It should also be understood that terms, such as those defined in a general dictionary, should be understood to have meanings consistent with their meanings in the context of the prior art and, unless specifically defined as herein, should not be interpreted in idealistic or overly formal meaning to explain.

A cantilever gantry provided in the embodiment of the present application, as shown in FIG. 1 , 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 arranged on the two load-bearing beams 102, one end is connected with the fixed surface 1, the other end is connected with the top of the steel pipe column 101 and two supporting structures 104 are located outside the gantry frame, and the two gantry rails are arranged on the two supporting structures 104. And for the lifting equipment 105 sliding on the gantry rail, one end of the bearing beam 102 protrudes from the vertical projection surface of the steel pipe to form a cantilever. In the embodiment provided in the present application, the fixed surface includes a bridge deck, and the cantilever gantry is installed on the bridge deck to realize girder feeding 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 has a simple structure and is easy to operate. The load-bearing beam 102 is mainly used to bear the force transmitted to the load-bearing beam 102 when the lifting equipment 105 is hoisted, and the force is transferred to the fixed surface through the steel pipe column 101. The lifting of the beam member and the movement of the beam member on the bridge deck have a certain supporting force and are not prone to overturning. The gantry track 103 is used for the hoisting equipment 105 to lift the girder members, and after they are lifted above the bridge deck, the lifting device 105 slides onto the bridge deck on the gantry track 103 so as to transport the girder members to the bridge deck to be installed Location.

Optionally, as shown in FIG. 3 , the two ends of the gantry rail 103 are provided with limiting structures 106 for restricting the movement of the lifting equipment to the gantry rail. Optionally, the limiting structures 106 are blocks disposed at both ends of the gantry rail 103 . The limit structure 106 is used to limit the farthest starting point of the hoisting equipment and the end point of the lowering beam member of the hoisting equipment, so as to avoid the excessive bending moment of the cantilever gantry caused by the too far hoisting point, thereby causing the cantilever gantry of the cantilever gantry to be too large. The end breaks, or the cantilever gantry overturns. Therefore, the limiting structure 106 can ensure that the positions of the hoisting point and the lowering point of the hoisting equipment are within the allowable range, and ensure the stability of the hoisting equipment from the hoisting to the lowering process.

It should be noted that, as shown in FIG. 1 , in the embodiment provided in the present application, in order to ensure the stability of the cantilever hanger and avoid the phenomenon that the cantilever gantry overturns during the process of lifting the rod by the hoisting equipment, an optional , the ratio of the distance from the farthest lifting point on the gantry track 103 to the axis of the fixed surface 1 and the distance from the edge of the fixed surface to the axis is 2:1. Optionally, the gantry rails 103 are P43 heavy rails, and the ratio between the distance between the two gantry rails 103 and the length of the rod to be lifted ranges from 2.4 to 6.5. In one embodiment, optionally, the standard length of the middle side main beam of the bridge segment is 11.7m, the width of the bottom plate is 1.1-1.92m, and the maximum weight after adding the anchor and pulling plate is 34.87t; the size of the beam is 29×0.7×2.82m, The maximum hoisting weight is 22.5t; the maximum size of the bridge deck is 7.25m×3.40m, the plane size after steel bars is 7.69m×4.34m, and the maximum weight is 20.6t. The distance from the farthest lifting point to the axis of the bridge deck is 30m, the distance between the gantry rails is 6.8m, and the distance between the wheels of the flat car for the lifting equipment to move before the gantry track is 1.5m, and the flat car is used for the gantry track. Slip on 103.

In the embodiment provided in this application, as shown in FIG. 1 , the load-bearing beam 102 on the fixed surface 1 is supported by the steel pipe column 101 perpendicular to the fixed surface, and the cantilevered load-bearing beam 102 is supported by the inclined steel pipe column 101 . Therefore, the steel pipe column 101 includes an inclined steel pipe column that is perpendicular to the fixed surface and has an included angle with 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 can be placed on the beam. The lifting of the rods and the movement of the beams and rods on the bridge deck have a certain supporting force and are not prone to overturning. In one embodiment, when the bridge deck wet joints and cast-in-place slabs are constructed, the cantilever gantry foundation embedded parts are pre-embedded in advance and fixed by welding with the steel beam, and the length and thickness of the welding seam meet the requirements of the specification. Use tower cranes and side-span bridge deck cranes to install steel pipe columns, diagonal braces, load-bearing beams and cranes in sequence. Among them, the steel pipe column is fixedly connected with 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 this application, when the cantilever gantry is constructed based on the steel pipe column, when the cantilever gantry can bear the load, the structure is simple, the construction difficulty is reduced, and the construction cost is saved, and the bridge deck does not need to reserve a large space for the construction. The construction of the cantilever gantry improves the construction efficiency.

In the embodiments provided in this application, in order to ensure that the cantilever gantry can bear a relatively large weight. Optionally, the load-bearing beam is made of 56a I-beam, and the axis direction of the load-bearing beam is perpendicular to the direction along the bridge, so that the cantilever gantry can extend out of the bridge deck to realize lateral feeding of the beam. The I-beam includes an upper flange, and the upper flange of the I-beam is provided with a steel plate, and the thickness of the steel plate is 19-21mm. The rods lifted by the equipment can be transported to the bridge smoothly.

In the embodiments provided in the present application, since the fixed surface includes the bridge deck, when the cantilever gantry is built on the bridge deck, the beam members are lifted from the side of the bridge to feed the beams. Therefore, the beam members are connected to the side edges of the bridge. parallel. In order to ensure that the beams and rods will not cause damage to other structures on the fixed surface during the transportation to the location to be installed, and at the same time reduce the site clearance on the fixed surface as much as possible to improve construction efficiency and ensure safety during transportation. , after the beam member is lifted above the bridge deck height, it needs to be rotated. Optionally, as shown in FIG. 1 to FIG. 3 , the position of the support structure 104 on the fixed surface does not affect the horizontal rotation of the rod under the gantry, and the position of the support structure 104 will not hinder the rotation of the beam and rod. The structure 104 is hinged with the fixed surface 1, so that the rotating support structure can be disassembled and rotated in time in advance when the arrangement position of the support structure 104 will hinder the rotation of the beam and rod, so as to realize the rotation of the beam and rod in place. Among them, two support structures 104 are provided at the tail of the cantilever gantry, and 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, it can also save material costs and reduce the weight of the steel structure itself. The pressure on the bridge deck, and to facilitate the transportation and installation of the support structure, the support structure 104 is made of 28a channel steel.

To sum up, the cantilever gantry provided by this application includes the following beneficial effects:

The cantilever gantry provided in the embodiment of the present application includes: a gantry foundation formed by 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 respectively arranged on the two load-bearing beams Rails, two supporting structures with one end connected to the fixed surface and the other end connected to the top of the steel pipe column and located on the outside of the gantry frame, and lifting equipment arranged on the two gantry rails and sliding on the gantry rails, one end of the bearing beam extends The vertical projection plane of the pipe column forms a cantilever. The cantilever gantry is constructed by using the steel pipe column structure, which is simple in structure and easy to operate. At the same time, the diagonal bracing can support the cantilever gantry, so that the cantilever gantry can be lifted during the lifting of the beam members and the movement of the beam members on the bridge deck. It has a certain supporting force and is not easy to overturn. The cantilever gantry has a simple structure, which reduces the construction difficulty and saves the construction cost. The bridge deck does not need to reserve a large space for the construction of the cantilever gantry, which improves the construction efficiency.

In the cantilever gantry provided in the embodiment of the present application, the two ends of the track are provided with limit structures that limit the movement of the flat car to the track of the gantry. At the end point, avoid the too far lifting point causing the cantilever gantry to suffer too much bending moment, which will cause the cantilever end of the cantilever gantry to break, or the cantilever gantry to overturn.

In the cantilever gantry provided in the embodiment of the present application, the load-bearing beam on the bridge deck is supported by the steel pipe column perpendicular to the fixed surface, the cantilevered load-bearing beam is supported by the inclined steel pipe column, and both the vertical and the inclined steel pipe column can support the cantilever door. The force on the frame is transferred to the fixed surface, which improves 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.

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. Because the beam and rod are lifted from the side of the fixed surface to feed the beam, the beam rod The piece is parallel to the side edge of the fixing surface. In order to ensure that the beams and rods will not cause damage to other structures on the fixed surface during the transportation to the location to be installed, and at the same time reduce the site clearance on the fixed surface as much as possible to improve construction efficiency and ensure safety during transportation. , after the beam member is raised above the height of the fixed surface, it needs to be rotated, so the setting position of the support structure will not hinder the beam member from rotating, so that the beam member can be rotated in place.

The above are only some embodiments of the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as It is the protection scope of the present invention.

Claims (9)

1. A cantilever gantry is characterized in that, comprising: the gantry foundation that is arranged on the fixed surface by the steel pipe column, the two load-bearing beams that are arranged on the top of the steel pipe column and the two load-bearing beams are respectively arranged on the two described load-bearing beams Two parallel gantry rails, one end is connected to the fixed surface, the other end is connected to the top of the steel pipe column and is located on the outside of the gantry frame. One end of the load-bearing beam protrudes from the vertical projection surface of the steel pipe column to form a cantilever. 2 . The cantilever gantry according to claim 1 , wherein the ratio of the distance from the farthest lifting point on the gantry track to the axis of the fixed surface and the distance from the edge of the fixed surface to the axis of the fixed surface is 2:1. 3 . 3 . The cantilever gantry according to claim 1 , wherein the two ends of the gantry track are provided with limit structures that limit the movement of the lifting equipment to the gantry track. 4 . 4 . The cantilever gantry according to claim 3 , wherein the limiting structure is a stopper provided at both ends of the gantry rail. 5 . 5 . The cantilever gantry according to claim 1 , wherein the load-bearing beam on the fixed surface is supported by the steel pipe column perpendicular to the fixed surface, and the load-bearing beam of the cantilever is supported by the inclined set of the cantilever gantry. 6 . Steel column support. 6 . The cantilever gantry according to claim 1 , wherein the steel pipe column is fixedly connected to the fixing surface. 7 . 7. The cantilever gantry according to claim 1, wherein the load-bearing beam is made of I-beam, the I-beam comprises an upper flange, and the upper flange of the I-beam is provided with a steel plate, The thickness of the steel plate is 19-21 mm. 8 . The cantilever gantry according to claim 1 , wherein the gantry rail adopts P43 heavy rail, and the ratio between the distance between the two gantry rails and the length of the rod to be lifted is: 2.4 -6.5. 9 . The cantilever gantry according to claim 1 , wherein the position where the support structure is arranged on the fixed surface does not affect the horizontal rotation of the rod under the gantry, and the support structure adopts 28a channel steel. 10 . production.

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