Land turning-over method and system for large asymmetric steel truss girder

Abstract

The invention relates to a land turning-over method and system for a large asymmetric steel truss girder, and the method comprises the steps that at least three turning-over devices are arranged within the span range of a portal crane, and the multiple turning-over devices are located on the same straight line; the gravity center of the large-scale asymmetric steel truss girder is obtained, the large-scale asymmetric steel truss girder is tightly placed on the supporting pieces of the multiple turning-over devices, and the vertical line of the gravity center of the large-scale asymmetric steel truss girder and the straight line where the multiple turning-over devices are located is located between any two adjacent turning-over devices; a crane of the portal crane is moved to the position above a lifting lug of the large asymmetric steel truss girder, and the working end of the crane is connected with the lifting lug through a lifting rope; and overturning the large asymmetric steel truss girder to a critical state through the crane, and hoisting the large asymmetric steel truss girder. According to the land turning-over method and system for the large asymmetric steel truss girder, the construction efficiency can be improved, and the construction risk can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of steel truss beam lifting, and in particular to a method and system for turning over a large asymmetric steel truss beam on land. Background Art

[0002] In bridge engineering, the construction plan of steel truss beams is different from the traditional loose assembly or whole segment lifting plan. It mainly adopts large asymmetric steel truss beams, highway bridge deck blocks or highway beams, railway bridge deck blocks or railway beams and other steel component units, and performs block bolt welding and segment connection according to the bridge position. However, large asymmetric steel truss beams are placed in a horizontal position after production, which makes lifting and shipment very difficult.

[0003] In the prior art, a crane is usually used to hoist the large asymmetric steel truss beam. During the hoisting, the large asymmetric steel truss beam is turned over by lifting and rotating. However, this method requires a larger construction site and is complicated to operate. Abnormal shaking is also prone to occur during the turning, which affects the construction efficiency and increases the construction risk.

[0004] Therefore, it is necessary to improve one or more problems existing in the above-mentioned related technical solutions.

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0006] The purpose of the embodiments of the present disclosure is to provide a method and system for turning over a large asymmetric steel truss beam on land, thereby overcoming one or more problems caused by the limitations and defects of the relevant technology at least to a certain extent.

[0007] In a first aspect, the present application provides a method for turning over a large asymmetric steel truss beam on land, comprising:

[0008] Arrange at least three turning devices within the span of the gantry crane, wherein the plurality of turning devices are located on the same straight line;

[0009] Obtaining the center of gravity of the large asymmetric steel truss beam, and placing the large asymmetric steel truss beam closely on the support members of the plurality of turning devices, wherein the center of gravity of the large asymmetric steel truss beam and the perpendicular line of the straight line where the plurality of turning devices are located are located between any two adjacent turning devices;

[0010] Move the crane of the gantry crane to the lifting lug of the large asymmetric steel truss beam, and connect the working end of the crane to the lifting lug via a lifting rope;

[0011] The large asymmetric steel truss beam is flipped to a critical state and lifted by the crane.

[0012] In a possible implementation, the step of arranging at least three turning devices within the span of the gantry crane, wherein the plurality of turning devices are located on the same straight line, comprises:

[0013] Within the span of the gantry crane, a plurality of the turning devices are arranged on the same straight line with a straightness of less than or equal to 5 mm;

[0014] The heights of the horizontal support plates of the plurality of turning device support members are adjusted so that the height difference of each horizontal support plate is less than or equal to 3 mm.

[0015] In a possible implementation, the step of obtaining the center of gravity of the large asymmetric steel truss beam and placing the large asymmetric steel truss beam closely on the support members of the plurality of turning devices, wherein a perpendicular line between the center of gravity of the large asymmetric steel truss beam and a straight line where the plurality of turning devices are located is located between any two adjacent turning devices, includes:

[0016] Establishing a model to determine the center of gravity of the large asymmetric steel truss beam;

[0017] The large asymmetric steel truss beam is transported to the top of the support of the turning device by a beam transport flat car, and the center of gravity of the large asymmetric steel truss beam and the perpendicular line of the straight line where the plurality of turning devices are located are located between any two adjacent turning devices;

[0018] Establishing a temporary support column at the bottom of the end of the large asymmetric steel truss beam away from the turning device;

[0019] The end of the large asymmetric steel truss beam close to the turning device is placed on the support members of the turning device, and the end away from the turning device is placed on the temporary support column. The gap between the large asymmetric steel truss beam and the support member is no more than 2 mm.

[0020] In a possible implementation, the step of moving the crane of the gantry crane above the lifting lug of the large asymmetric steel truss beam and connecting the working end of the crane to the lifting lug via a lifting rope comprises:

[0021] fixing a lifting lug on the lifting side of the large asymmetric steel truss beam;

[0022] The hoist of the gantry crane is moved above the lifting eye, and the lifting eye is connected to the working end of the hoist via a lifting rope.

[0023] In a possible implementation, the step of flipping the large asymmetric steel truss beam to a critical state and lifting it by the crane includes:

[0024] The crane is moved at a uniform speed in the turning direction, and the working end of the crane is pulled up at a uniform speed to turn the large asymmetric steel truss beam to a critical state, wherein the moving speed and the pulling speed of the crane are less than or equal to 1 m / min;

[0025] The hook is adjusted in a critical state so that the hoisting rope is evenly stressed, and then the working end of the crane is pulled up to lift the large asymmetric steel truss beam.

[0026] In a possible implementation, the turning device is fixed in one direction when the large asymmetric steel truss beam turns over to a critical state, and cannot continue to rotate in the turning direction of the large asymmetric steel truss.

[0027] In a possible implementation, the gantry crane has two cranes, and the two cranes lift the working end at the same speed.

[0028] In a possible implementation, the lifting rope is a steel wire rope.

[0029] In a second aspect, the present application provides a land turning system for a large asymmetric steel truss beam, which is used to perform the land turning method of the large asymmetric steel truss beam, and the system comprises:

[0030] A gantry crane comprises: a gantry, a crane and a traveling crane, wherein the traveling crane is movably connected to the gantry, and the crane is movably connected to the traveling crane;

[0031] The turning device is arranged within the span of the gantry crane and comprises: a support member and a base, wherein the support member is rotatably connected to the base;

[0032] Beam transport flat car, used to transport steel truss beams;

[0033] A temporary support column, used to support one end of the steel truss beam away from the turning device when the steel truss beam is placed on the turning device;

[0034] A lifting lug is fixedly connected to the lifting side of the steel truss beam and is used to be connected to the working end of the crane through a lifting rope.

[0035] In a possible embodiment, the support member has a first balance member and a second balance member on both sides; when the support member is in the initial position, the bottom of the first balance member is stably supported by the ground, and the bottom of the second balance member has an inclined surface. When the steel truss beam flips over to a critical state, the inclined surface of the bottom of the second balance member is stably supported by the ground.

[0036] The technical solution provided by this application may have the following beneficial effects:

[0037] The above technical solution of the present application can realize the land turning operation of large asymmetric steel truss beams through a gantry crane in cooperation with a turning device. The operation method is simple and the operation process is efficient. It can also avoid the shaking of the large asymmetric steel truss beams when they are turned over to the critical point, thereby improving construction efficiency and reducing construction risks.

[0038] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0040] Figure 1 A schematic flow chart showing a method for turning over a large asymmetric steel truss beam on land in an exemplary embodiment of the present disclosure;

[0041] Figure 2 A detailed schematic diagram showing a method for turning over a large asymmetric steel truss beam on land in an exemplary embodiment of the present disclosure;

[0042] Figure 3 A schematic diagram showing the implementation preparation of a land turning system for a large asymmetric steel truss beam in an exemplary embodiment of the present disclosure;

[0043] Figure 4 A schematic diagram showing a turning device of a land turning system of a large asymmetric steel truss beam in an exemplary embodiment of the present disclosure;

[0044] Figure 5 A schematic diagram showing the placement of steel beams of a land turning system of a large asymmetric steel truss beam in an exemplary embodiment of the present disclosure;

[0045] Figure 6 A schematic diagram showing the transportation of a beam flat car of a land turning system for a large asymmetric steel truss beam in an exemplary embodiment of the present disclosure;

[0046] Figure 7 A schematic diagram showing the gantry crane hoisting of a land turning system of a large asymmetric steel truss beam in an exemplary embodiment of the present disclosure;

[0047] Figure 8A schematic diagram showing the steel beam fixing and hoisting of a land turning system of a large asymmetric steel truss beam in an exemplary embodiment of the present disclosure;

[0048] Fig. 9 A schematic diagram showing the gantry crane hoisting of a land turning system of a large asymmetric steel truss beam in an exemplary embodiment of the present disclosure;

[0049] Fig.10 A schematic diagram showing the steel beam hoisting state of the land turning system of the large asymmetric steel truss beam in the exemplary embodiment of the present disclosure.

[0050] Reference numerals:

[0051] 100, gantry crane, 110, gantry, 120, crane, 130, crane;

[0052] 200, turning device, 210, supporting member, 220, base, 230, first balancing member; 240, second balancing member;

[0053] 300, steel truss beam; 400, beam transport flat car; 500, temporary support column; 600, lifting lug; 700, lifting rope; 800, lifting ring. DETAILED DESCRIPTION

[0054] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the disclosure will be more comprehensive and complete and to fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0055] In addition, the accompanying drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and their repeated description will be omitted. Some of the block diagrams shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software form, or implemented in one or more hardware modules or integrated circuits, or implemented in different networks and / or processor devices and / or microcontroller devices.

[0056] In this example implementation, a method for turning over a large asymmetric steel truss beam on land is first provided. Figure 1-10 As shown in , the method includes:

[0057] Step S100: Arrange at least three turning devices within the span of the gantry crane, wherein the plurality of turning devices are located on the same straight line.

[0058] Step S200: Obtain the center of gravity of the large asymmetric steel truss beam, and place the large asymmetric steel truss beam tightly on the support members of the plurality of turning devices, wherein the center of gravity of the large asymmetric steel truss beam and a perpendicular line to the straight line where the plurality of turning devices are located are located between any two adjacent turning devices.

[0059] Step S300: Move the crane of the gantry crane above the lifting lug of the large asymmetric steel truss beam, and connect the working end of the crane to the lifting lug via a lifting rope.

[0060] Step S400: flipping the large asymmetric steel truss beam to a critical state and lifting it by the crane.

[0061] Through the above-mentioned land turning method of large asymmetric steel truss beams, it is possible to combine existing equipment resources, based on a full analysis and study of large asymmetric steel truss beams, utilize the principles of rotation and articulation, and use gantry cranes and beam transport flat cars to achieve the overall turning of steel components, turning large asymmetric steel truss beams from a horizontal state to a vertical state, so that they can be loaded and shipped by crane in the vertical state.

[0062] In one embodiment, Figure 2 As shown, the step S100 includes:

[0063] Step S110: Within the span of the gantry crane, a plurality of the turning devices are arranged on the same straight line with a straightness less than or equal to 5 mm.

[0064] Step S120: adjusting the heights of the horizontal support plates of the plurality of turning device support members so that the height difference of each horizontal support plate is less than or equal to 3 mm.

[0065] By controlling the straightness of the plurality of turning devices and the height difference of each horizontal support plate, the large asymmetric steel truss beam will not be separated from the turning device when turning over. Figure 3-4 As shown, Figure 3 Prepare for the turnaround. Figure 4 This is a schematic diagram of a turning device.

[0066] Optionally, a plurality of the turning devices are arranged at fixed intervals to support the entire large asymmetric steel truss beam.

[0067] In one embodiment, Figure 2 As shown, the step S200 includes:

[0068] Step S210: Establish a model to determine the center of gravity of the large asymmetric steel truss beam.

[0069] Step S220: transport the large asymmetric steel truss beam to above the support of the turning device by a beam transport flat car, and the center of gravity of the large asymmetric steel truss beam and the perpendicular line of the straight line where the multiple turning devices are located are located between any two adjacent turning devices.

[0070] Step S230: Establish a temporary support column at the bottom of the end of the large asymmetric steel truss beam away from the turning device.

[0071] Step S240: Place one end of the large asymmetric steel truss beam close to the turning device on the support members of the turning device, and place the other end away from the turning device on the temporary support column. The gap between the large asymmetric steel truss beam and the support member is no more than 2 mm.

[0072] The center of gravity of the large asymmetric steel truss beam is determined by establishing a 1:1 model on a computer.

[0073] It should be noted that the above method ensures that the beam transport flat car transports the large asymmetric steel truss beam to a position between any two adjacent turning devices, which is perpendicular to the center of gravity and the straight line where the turning devices are located, and then establishes a temporary support column, and then places the large asymmetric steel truss beam on the support member of the turning device and the temporary support column through the lifting platform, wherein the height difference between the temporary support column and the horizontal support plate of each support member is less than or equal to 3mm, such as Figure 5-6 As shown, Figure 5 This is a schematic diagram of the placement of steel truss beams. Figure 6 This is a schematic diagram of beam flat car transportation.

[0074] In one embodiment, Figure 2 As shown, the step S300 includes:

[0075] Step S310: Fixing a lifting lug on the lifting side of the large asymmetric steel truss beam.

[0076] Step S320: Move the crane of the gantry crane above the lifting eye, and connect the lifting eye to the working end of the crane via a lifting rope.

[0077] Wherein, optionally, the lifting lugs are multiple welded on the lifting side of the large asymmetric steel truss beam, the gantry crane has two hoists, the two hoists have the same speed of lifting the working end, the lifting lugs are four, and a group of two lifting lugs corresponds to one hoist, such as Figure 7-8 As shown, Figure 7 This is a top view of the gantry crane during hoisting. Figure 8 Schematic diagram of steel truss beam and crane fixation.

[0078] Optionally, the lifting rope is a steel wire rope.

[0079] In one embodiment, Figure 2 As shown, the step S400 includes:

[0080] Step S410: Move the crane in the turning direction at a uniform speed, and lift the working end of the crane at a uniform speed to flip the large asymmetric steel truss beam to a critical state, wherein the moving speed and lifting speed of the crane are less than or equal to 1 m / min.

[0081] Step S420: adjusting the hook in a critical state so that the hoisting rope is evenly stressed, and then lifting the working end of the crane to lift the large asymmetric steel truss beam.

[0082] It should be noted that by moving and pulling at a uniform speed, the large asymmetric steel truss beam is slowly flipped to a critical state to avoid abnormal movement of the steel truss beam due to inertia, such as Figure 9-10 As shown, Fig. 9 Schematic diagram of the gantry crane lifting of the land turning system of a large asymmetric steel truss beam. Fig.10 Schematic diagram of the steel truss beam in the hoisting state.

[0083] Optionally, the hoisting position of the crane hook and the steel wire rope is adjusted so that the two sections of steel wire rope on both sides of the crane are evenly stressed, thereby avoiding significant shaking of the steel truss beam after lifting.

[0084] In one embodiment, the turning device is fixed in one direction when the large asymmetric steel truss beam turns over to a critical state, and cannot continue to rotate in the turning direction of the large asymmetric steel truss.

[0085] It should be noted that this method can keep the large asymmetric steel truss stable in a critical state and prevent critical shaking caused by the offset of the center of gravity.

[0086] This example embodiment also provides a land turning system of a large asymmetric steel truss beam, referring to Figure 3-10 As shown, the system may include:

[0087] The gantry crane 100 comprises: a gantry 110, a crane 120 and a trolley 130, wherein the trolley 130 is movably connected to the gantry 110, and the crane 120 is movably connected to the trolley 130;

[0088] The turning device 200 is arranged within the span range of the gantry crane 100, and comprises: a support member 210 and a base 220, wherein the support member 210 is rotatably connected to the base 220;

[0089] A beam transport flat car 400, used to transport steel truss beams 300;

[0090] A temporary support column 500, used to support the end of the steel truss beam 300 away from the turning device 200 when the steel truss beam 300 is placed on the turning device 200;

[0091] The lifting lug 600 is fixedly connected to the lifting side of the steel truss beam 400 and is used to be connected to the working end of the crane 120 via a lifting rope 700.

[0092] It should be noted that the land turning method of the large asymmetric steel truss beam of the present application can be realized through the land turning system of the large asymmetric steel truss beam mentioned above.

[0093] In one embodiment, the support member 210 has a first balancing member 230 and a second balancing member 240 on both sides; when the support member 210 is in the initial position, the bottom of the first balancing member 230 is stably supported by the ground, and the bottom of the second balancing member 240 has an inclined surface. When the steel truss beam 400 turns over to a critical state, the inclined surface of the bottom of the second balancing member 240 is stably supported by the ground.

[0094] It should be noted that when the steel truss beam 400 turns over to a critical state, the inclined surface at the bottom of the second balancing member 240 just contacts the ground as a whole, so that the large asymmetric steel truss continues to rotate in the turning direction.

[0095] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present disclosure.

[0096] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0097] In the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0098] In the present disclosure, unless otherwise expressly specified and limited, a first feature being “above” or “below” a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being “above”, “above”, and “above” a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0099] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0100] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. A method for turning over a large asymmetric steel truss beam on land, characterized in that: include: Arrange at least three turning devices within the span of the gantry crane, wherein the plurality of turning devices are located on the same straight line; Obtaining the center of gravity of the large asymmetric steel truss beam, and placing the large asymmetric steel truss beam closely on the support members of the plurality of turning devices, wherein the center of gravity of the large asymmetric steel truss beam and the perpendicular line of the straight line where the plurality of turning devices are located are located between any two adjacent turning devices; Move the crane of the gantry crane to the lifting lug of the large asymmetric steel truss beam, and connect the working end of the crane to the lifting lug via a lifting rope; The large asymmetric steel truss beam is flipped to a critical state and lifted by the crane.

2. The method for turning over a large asymmetric steel truss beam on land according to claim 1, characterized in that: The step of arranging at least three turning devices within the span of the gantry crane, wherein the plurality of turning devices are located on the same straight line, comprises: Within the span of the gantry crane, a plurality of the turning devices are arranged on the same straight line with a straightness of less than or equal to 5 mm; The heights of the horizontal support plates of the plurality of turning device support members are adjusted so that the height difference of each horizontal support plate is less than or equal to 3 mm.

3. The method for turning over a large asymmetric steel truss beam on land according to claim 1, characterized in that: The step of obtaining the center of gravity of the large asymmetric steel truss beam and placing the large asymmetric steel truss beam closely on the support members of the plurality of turning devices, wherein the center of gravity of the large asymmetric steel truss beam and a perpendicular line to the straight line where the plurality of turning devices are located are located between any two adjacent turning devices, comprises: Establishing a model to determine the center of gravity of the large asymmetric steel truss beam; The large asymmetric steel truss beam is transported to the top of the support of the turning device by a beam transport flat car, and the center of gravity of the large asymmetric steel truss beam and the perpendicular line of the straight line where the plurality of turning devices are located are located between any two adjacent turning devices; Establishing a temporary support column at the bottom of the end of the large asymmetric steel truss beam away from the turning device; The end of the large asymmetric steel truss beam close to the turning device is placed on the support members of the turning device, and the end away from the turning device is placed on the temporary support column. The gap between the large asymmetric steel truss beam and the support member is no more than 2 mm.

4. The method for turning over a large asymmetric steel truss beam on land according to claim 1, characterized in that: The step of moving the crane of the gantry crane above the lifting lug of the large asymmetric steel truss beam and connecting the working end of the crane to the lifting lug via a lifting rope comprises: fixing a lifting lug on the lifting side of the large asymmetric steel truss beam; The hoist of the gantry crane is moved above the lifting eye, and the lifting eye is connected to the working end of the hoist via a lifting rope.

5. The method for turning over a large asymmetric steel truss beam on land according to claim 1, characterized in that: The step of flipping the large asymmetric steel truss beam to a critical state and lifting it by the crane comprises: The crane is moved at a uniform speed in the turning direction, and the working end of the crane is pulled up at a uniform speed to turn the large asymmetric steel truss beam to a critical state, wherein the moving speed and the pulling speed of the crane are less than or equal to 1 m / min; The hook is adjusted in a critical state so that the hoisting rope is evenly stressed, and then the working end of the crane is pulled up to lift the large asymmetric steel truss beam.

6. The method for turning over a large asymmetric steel truss beam on land according to claim 5, characterized in that: The turning device is fixed in one direction when the large asymmetric steel truss beam turns over to a critical state, and cannot continue to rotate in the turning direction of the large asymmetric steel truss.

7. The method for turning over a large asymmetric steel truss beam on land according to claim 5, characterized in that: The gantry crane has two hoists, and the two hoists lift the working end at the same speed.

8. The method for turning over a large asymmetric steel truss beam on land according to claim 1, characterized in that: The lifting rope is a steel wire rope.

9. A land turning system for a large asymmetric steel truss beam, characterized in that: The system is used to perform the land turning method of the large asymmetric steel truss beam according to any one of claims 1 to 8, and the system comprises: A gantry crane comprises: a gantry, a crane and a traveling crane, wherein the traveling crane is movably connected to the gantry, and the crane is movably connected to the traveling crane; The turning device is arranged within the span of the gantry crane and comprises: a support member and a base, wherein the support member is rotatably connected to the base; Beam transport flat car, used to transport steel truss beams; A temporary support column, used to support one end of the steel truss beam away from the turning device when the steel truss beam is placed on the turning device; A lifting lug is fixedly connected to the lifting side of the steel truss beam and is used to be connected to the working end of the crane through a lifting rope.

10. The land turning system of the large asymmetric steel truss beam according to claim 9, characterized in that: The support member has a first balancing member and a second balancing member on both sides; when the support member is in the initial position, the bottom of the first balancing member is stably supported by the ground, and the bottom of the second balancing member has an inclined surface. When the steel truss beam flips over to a critical state, the inclined surface of the bottom of the second balancing member is stably supported by the ground.

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