Cantilever structure of steel box girder

Abstract

The utility model relates to a cantilever structure of a steel box girder. The cantilever structure comprises a side span steel box girder, the cantilever arm is detachably connected with the two ends of the side span steel box girder, the cantilever arm is hinged to the side span steel box girder, and a hinged shaft of the cantilever arm and the side span steel box girder is horizontal and perpendicular to the length direction of the side span steel box girder; the cantilever arm and the side span steel box girder are in two states: one state is that the cantilever arm surrounds a hinge shaft and is positioned above the side span steel box girder; secondly, the cantilever is overturned around the hinge shaft, the cantilever is connected with the two ends of the side span steel box girder in an abutting mode, the cantilever is connected with the two ends of the side span steel box girder in an abutting mode through hoisting equipment, the combination faces of the cantilever and the side span steel box girder are welded, and connection between the side span steel box girder and the cantilever is achieved; the cantilever can be located on the side span steel box girder to be folded and unfolded for welding, a crane does not need to be occupied all the time, the construction efficiency between the steel box girder and the cantilever is improved, and construction safety is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge construction, in particular to a steel box beam cantilever structure. Background Art

[0002] A steel box girder bridge is constructed by splicing together several groups of unit steel box girders. To facilitate actual construction, facilitate the hoisting of the entire unit steel box girder, and avoid the problem of inconvenient control of the center of gravity of the steel box girder, the unit steel box girder includes a side span steel box girder and cantilevers arranged at both ends. The lower beam surface of the cantilever is an inclined surface, and the cantilever and the side span steel box girder are welded together as a whole. Therefore, when actually welding the cantilever and the side span steel box girder, a bracket is required for temporary support. However, the bottom of the cantilever has a height difference and presents an inclined structure, so it is impossible to use a bracket for support. In some existing technologies, when welding the cantilever and the side span steel box girder, a crane is generally used to hoist the cantilever. Therefore, the crane is always occupied until the temporary connection deck is welded to the side span steel box girder, and the crane can only be released to the cantilever. Therefore, in this construction plan, the crane needs to be occupied until the deck is welded and the crane can only be released. The actual construction efficiency is low and there are also safety risks on site. It is urgent to improve the existing plan. Utility Model Content

[0003] The purpose of the utility model is to provide a steel box girder cantilever structure, which can easily realize the connection between the side span steel box girder and the cantilever, so that the cantilever can be folded and unfolded on the side span steel box girder for welding without occupying a crane all the time, thereby improving the construction efficiency between the steel box girder and the cantilever and ensuring the safety of construction.

[0004] The following technical solutions are used to solve the technical problems in this utility model:

[0005] A steel box beam cantilever structure, comprising

[0006] Side span steel box girder;

[0007] a cantilever arm, detachably connected to both ends of the side span steel box girder, and the cantilever arm and the side span steel box girder are hingedly arranged, and the hinge axis of the cantilever arm and the side span steel box girder is horizontal and perpendicular to the length direction of the side span steel box girder;

[0008] The cantilever arm and the side span steel box girder are in two states: one is that the cantilever arm rotates around the hinge axis and is located above the side span steel box girder; the other is that the cantilever arm flips around the hinge axis and makes the cantilever arm respectively abut against the two ends of the side span steel box girder.

[0009] The utility model also has the following technical features:

[0010] In one embodiment of the present invention, a connector is provided between the cantilever arm and the side span steel box girder, the connector is connected to both ends of the side span steel box girder, the cantilever arm and the connector form a position-adjustable connection, and the cantilever arm slides along the length direction of the connector.

[0011] In one embodiment of the present invention, the connector includes a connecting shaft rod, and a slot is provided on the upper beam surface of the side span steel box girder. The slot is perpendicular to the length direction of the side span steel box girder, and the connecting shaft rod is clamped in the slot.

[0012] In one embodiment of the present invention, the slot has a V-shaped opening and a semicircular cross-section.

[0013] In one embodiment of the present invention, ear plates are vertically provided at both ends of the connecting shaft, and sliding grooves are provided on the opposite sides of the ear plates. The slides are arranged along the length direction of the ear plates, and sliding shafts are provided on both sides of the cantilever arm, and the sliding shafts extend into the sliding grooves.

[0014] In one embodiment of the present invention, an adjustment seat is rotatably provided on one side of the side span steel box girder, an adjustment nut is provided on the adjustment seat, and an adjustment screw is provided on one side of the cantilever arm, and the adjustment screw cooperates with the adjustment nut.

[0015] In one embodiment of the present invention, positioning grooves are provided at both ends of the side span steel box girder, and a positioning protrusion is provided at one end of the cantilever arm, and the positioning protrusion and the positioning groove form a snap fit.

[0016] Compared with the existing technology, the beneficial effects of the present invention are reflected in that: when the steel box girder cantilever structure is actually used, the cantilever is pre-installed at the two end positions of the side span steel box girder, and the cantilever is located above the side span steel box girder, and then the side span steel box girder equipped with the cantilever is hoisted to the installation position of the bridge by a lifting equipment for installation, and then the cantilever is flipped around the hinge axis by the lifting equipment, and the cantilever is respectively connected to the two ends of the side span steel box girder, and then the lifting equipment can be evacuated from the work site, and then the joint surface of the cantilever and the side span steel box girder is welded to realize the connection between the side span steel box girder and the cantilever, so that the cantilever can be located on the side span steel box girder, folded and unfolded for welding, without occupying the crane all the time, thereby improving the construction efficiency between the steel box girder and the cantilever and ensuring the safety of construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 and Figure 2 This is a schematic structural diagram of a steel box beam cantilever structure in one embodiment of the present invention from two perspectives;

[0018] Figure 3This is a partial structural cross-sectional diagram of a steel box beam cantilever structure in one embodiment of the present invention;

[0019] Figure 4 This is a structural schematic diagram of a mid-span steel box girder in a steel box girder cantilever structure in one embodiment of the present invention;

[0020] Figure 5 This is a structural schematic diagram of a cantilever arm in a steel box girder cantilever arm structure in one embodiment of the present invention;

[0021] Figure 6 This is a front view of a steel box beam cantilever structure in one embodiment of the present invention;

[0022] Figure 7 and Figure 8 These are two main views of a steel box beam cantilever structure in one embodiment of the present invention; DETAILED DESCRIPTION

[0023] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different perspectives and applications without departing from the spirit of the present invention.

[0024] It should be noted that the illustrations provided in this embodiment are only used to schematically illustrate the basic concept of the present invention. Therefore, the illustrations only show components related to the present invention and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0025] In order to solve the existing problem of hoisting and splicing of the unit steel box girder, to ensure the stability of the center of gravity of the unit steel box girder, and to avoid the width of the entire unit steel box girder being too wide and inconvenient to control and hoist, the unit steel box girder is disassembled, including a horizontally arranged rectangular side span steel box girder 10 and cantilevers 20 at both ends. The lower beam surface of the cantilevers 20 has an inclined surface. When hoisting, it is necessary to hoist the cantilevers 20 separately, and then weld temporary lap plates at both ends of the side span steel box girder 10 before the cantilevers 20 can be released at the two end positions of the side span steel box girder 10. Therefore, the actual construction efficiency is very low, and it is necessary to improve the problems existing in the existing technology. The utility model proposes A steel box girder cantilever structure includes a side span steel box girder 10; a cantilever 20, which is detachably connected to both ends of the side span steel box girder 10, and the cantilever 20 is hingedly arranged with the side span steel box girder 10, and the hinge axis between the cantilever 20 and the side span steel box girder 10 is horizontal and perpendicular to the length direction of the side span steel box girder 10; the cantilever 20 and the side span steel box girder 10 present two states, one of which is that the cantilever 20 is rotated around the hinge axis and is located above the side span steel box girder 10; the other is that the cantilever 20 is flipped around the hinge axis, and the cantilever 20 is respectively abutted against the two ends of the side span steel box girder 10.

[0026] In one embodiment, see Figure 1 and Figure 2 After the side span steel box girder 10 and the cantilever arm 20 are produced separately, the cantilever arm 20 is pre-installed on both ends of the side span steel box girder 10, and the cantilever arm 20 is positioned above the side span steel box girder 10 around the hinge axis, so that the width of the entire unit steel box girder can be kept in a smaller range, which is convenient for hoisting. After hoisting to the installation position, the cantilever arm 20 is flipped around the hinge axis, and the cantilever arm 20 is respectively connected to the two ends of the side span steel box girder 10, and then the hoisting equipment can be transferred out, and the side span steel box girder 10 and the cantilever arm 20 can be welded, which can significantly improve the working efficiency while ensuring the working safety.

[0027] In one embodiment, in order to ensure that the side span steel box girder 10 and the cantilever arm 20 can abut against each other, so as to ensure the welding reliability of the side span steel box girder 10 and the cantilever arm 20, a connector 30 is provided between the cantilever arm 20 and the side span steel box girder 10, and the connector 30 is connected to both ends of the side span steel box girder 10, and the cantilever arm 20 and the connector 30 form a position-adjustable connection, and the cantilever arm 20 slides along the length direction of the connector 30.

[0028] In one embodiment, when the cantilever arm 20 is flipped around the hinge axis and the cantilever arm 20 is connected closely to the two ends of the side span steel box girder 10, and then the cantilever arm 20 is adjusted to slide along the length direction of the connector 30, the cantilever arm 20 is respectively abutted against the two ends of the side span steel box girder 10, thereby ensuring that the cantilever arm 20 is welded to the two ends of the side span steel box girder 10, thereby ensuring the reliability of the connection between the two.

[0029] In one embodiment, see Figure 4 In order to facilitate the installation and connection between the cantilever arm 20 and the side span steel box girder 10, the connector 30 includes a connecting shaft 31. A slot 11 is provided on the upper beam surface of the side span steel box girder 10. The slot 11 is perpendicular to the length direction of the side span steel box girder 10, and the connecting shaft 31 is clamped in the slot 11.

[0030] In one embodiment, in order to facilitate the insertion of the connecting shaft 31 into the slot 11 , the slot 11 has a V-shaped notch and a semicircular cross-section.

[0031] During the actual installation of the cantilever arm 20 and the side span steel box girder 10, the connecting shaft 31 can be slid along the upper beam surface of the side span steel box girder 10 in advance through the lifting equipment until the connecting shaft 31 is inserted into the slot 11, and the cantilever arm 20 is placed against the upper beam surface of the side span steel box girder 10, thereby realizing the installation of the two.

[0032] In one embodiment, see Figure 3 In order to enable the cantilever arm 20 to slide along the length direction of the lug plate 32, thereby ensuring that the cantilever arm 20 abuts against the end face of the side span steel box girder 10, so as to facilitate welding of the end faces of the cantilever arm 20 and the side span steel box girder 10, lug plates 32 are vertically provided at both ends of the connecting shaft 31, and sliding grooves 321 are provided on the opposite sides of the lug plates 32. The sliding grooves 321 are arranged along the length direction of the lug plates 32, and sliding shafts 21 are provided on both sides of the cantilever arm 20, and the sliding shafts 21 extend into the sliding grooves 321.

[0033] In one embodiment, see Figure 6 In order to adjust the distance between the cantilever arm 20 and the side span steel box girder 10, an adjustment seat 12 is rotatably provided on one side of the side span steel box girder 10, and an adjustment nut 13 is provided on the adjustment seat 12. An adjustment screw 22 is provided on one side of the cantilever arm 20, and the adjustment screw 22 cooperates with the adjustment nut 13.

[0034] In one embodiment, after the cantilever arm 20 is flipped to the end face of the side span steel box girder 10, the distance between the cantilever arm 20 and the end face of the side span steel box girder 10 can be adjusted by rotating the adjusting screw 22 and cooperating with the adjusting nut 13 until the cantilever arm 20 fits the end face of the side span steel box girder 10, thereby ensuring the reliability of the connection between the cantilever arm 20 and the side span steel box girder 10.

[0035] In one embodiment, see Figure 4 and Figure 5 Both ends of the side span steel box girder 10 are provided with positioning grooves 14 , and one end of the cantilever arm 20 is provided with a positioning protrusion 23 , and the positioning protrusion 23 and the positioning groove 14 form a snap fit.

[0036] See Figure 7 and Figure 8 The following introduces a folding construction method for a steel box girder cantilever structure. During actual construction, the side span steel box girder 10 is formed, and the cantilever arm 20 is formed; the connector 30 is pre-installed on the cantilever arm 20; the cantilever arm 20 with the connector 30 installed is hoisted to the top of the side span steel box girder 10 by a hoisting device, so that the connecting shaft 31 of the connector 30 is clamped in the clamping groove 11 of the side span steel box girder 10, so that the cantilever arm 20 rotates around the connecting shaft 31 and is located above the side span steel box girder 10; the two ends are mounted by a hoisting device. The side span steel box girder 10 with the cantilever arm 20 is hoisted to the installation position of the upper bridge; after the side span steel box girder 10 is placed, the cantilever arm 20 is hoisted by the hoisting equipment, so that the cantilever arm 20 rotates around the connecting shaft 31 and the cantilever arm 20 is close to the two ends of the side span steel box girder 10, and the hoisting equipment is moved out of the working position; by rotating the adjusting screw 22, the cantilever arm 20 is respectively abutted against the two ends of the side span steel box girder 10, and then the joint surfaces of the cantilever arm 20 and the side span steel box girder 10 at both ends are welded, and the folding construction of the cantilever arm and the side span steel box girder can be completed.

[0037] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0038] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A steel box girder cantilever structure, characterized by: include Side span steel box girder (10); A cantilever arm (20) is detachably connected to both ends of the side span steel box girder (10), and the cantilever arm (20) and the side span steel box girder (10) are hingedly arranged, and the hinge axis between the cantilever arm (20) and the side span steel box girder (10) is horizontal and perpendicular to the length direction of the side span steel box girder (10); The cantilever arm (20) and the side span steel box girder (10) present two states, one of which is that the cantilever arm (20) rotates around the hinge axis and is located above the side span steel box girder (10); the other is that the cantilever arm (20) flips around the hinge axis and makes the cantilever arm (20) respectively abut against the two ends of the side span steel box girder (10).

2. The steel box girder cantilever structure according to claim 1, characterized in that: A connector (30) is provided between the cantilever arm (20) and the side span steel box girder (10), the connector (30) being connected to both ends of the side span steel box girder (10), the cantilever arm (20) and the connector (30) forming a position-adjustable connection, and the cantilever arm (20) sliding along the length direction of the connector (30).

3. The steel box girder cantilever structure according to claim 2, characterized in that: The connecting body (30) includes a connecting shaft (31), and a clamping groove (11) is provided on the upper beam surface of the side span steel box girder (10). The clamping groove (11) is perpendicular to the length direction of the side span steel box girder (10), and the connecting shaft (31) is clamped in the clamping groove (11).

4. The steel box girder cantilever structure according to claim 3, characterized in that: The slot (11) has a V-shaped notch, and the cross-section of the slot (11) is semicircular.

5. The steel box girder cantilever structure according to claim 3, characterized in that: Lug plates (32) are vertically provided at both ends of the connecting shaft (31), and slide grooves (321) are provided on opposite sides of the lug plates (32). The slide grooves (321) are arranged along the length direction of the lug plates (32). Sliding shafts (21) are provided on both sides of the lifting arm (20), and the sliding shafts (21) extend into the slide grooves (321).

6. The steel box girder cantilever structure according to claim 5, characterized in that: An adjusting seat (12) is rotatably provided on one side of the side span steel box girder (10), an adjusting nut (13) is provided on the adjusting seat (12), and an adjusting screw (22) is provided on one side of the cantilever arm (20), the adjusting screw (22) cooperates with the adjusting nut (13).

7. The steel box girder cantilever structure according to claim 6, characterized in that: Both ends of the side span steel box beam (10) are provided with positioning grooves (14), and one end of the cantilever arm (20) is provided with a positioning protrusion (23), and the positioning protrusion (23) and the positioning groove (14) form a snap fit.

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