Bottom beam structure, underframe and mobile tower crane

Abstract

The present invention belongs to the technical field of engineering machinery, and specifically relates to a bottom beam structure, a chassis, and a mobile tower crane. The bottom beam structure includes a bottom beam frame and a plurality of load-sharing beams. The bottom beam frame includes a cross beam, a circumferential reinforcement beam, and a horizontal reinforcement beam. The circumferential reinforcement beam is connected to the end of the cross beam, and the two ends of the horizontal reinforcement beam are respectively connected to the circumferential reinforcement beam and the cross beam. The plurality of load-sharing beams are mounted on the bottom beam frame and arranged in parallel and spaced relation along the longitudinal direction. The load is transmitted to the load-sharing beams through the circumferential reinforcement beams, the horizontal reinforcement beams, and the cross beam, thereby playing a load-sharing role. In order to strengthen the rigidity of the circumferential reinforcement beams, short diagonal braces are provided in the chassis. This improves the stability and load-bearing capacity of the bottom beam structure, making the bottom beam structure adaptable to large or extra-large mobile tower cranes. Secondly, the load-sharing beams can play a role similar to a ballast block, and the center of gravity of a mobile tower crane equipped with the bottom beam structure is lower, avoiding the need for additional ballast blocks.

Description

Technical Field

[0001] The present invention belongs to the technical field of engineering machinery, and in particular relates to a bottom beam structure, an underframe and a mobile tower crane. Background Art

[0002] like Figure 1 and Figure 2 As shown, the conventional underframe 1 of an existing traveling tower crane includes a conventional bottom beam frame 4, a standard section 2, and a ballast 3. The standard section 2 and ballast 3 are mounted on the conventional bottom beam frame 4. The conventional bottom beam frame 4 is also equipped with traveling wheels 5 that cooperate with rails 6. The conventional bottom beam frame 4 includes a conventional cross beam 7 and a tie rod 8 connected to the end of the conventional cross beam 7. Its structure is simple and its load-bearing capacity is limited. It is suitable for small tower cranes (generally within a track gauge of 10m). Furthermore, a ballast 3 needs to be configured on the conventional bottom beam frame 4 to lower the center of gravity to prevent the tower crane from tipping over. Summary of the Invention

[0003] In view of the above-mentioned defects or deficiencies in the prior art, the present invention provides a bottom beam structure, a base frame and a tower crane. The bottom beam structure has better stability and stronger bearing capacity, and is suitable for large or super-large mobile tower cranes.

[0004] To achieve the above objectives, the present invention provides a bottom beam structure in a first aspect, the bottom beam structure comprising:

[0005] A bottom beam frame, comprising a cross beam, a peripheral reinforcement beam, and a horizontal reinforcement beam, wherein the peripheral reinforcement beam is connected to the end of the cross beam, and both ends of the horizontal reinforcement beam are respectively connected to the peripheral reinforcement beam and the cross beam; and

[0006] A plurality of load-sharing beams are arranged below the bottom beam frame and spaced apart in parallel along the longitudinal direction.

[0007] Optionally, the cross beam includes a main beam and half beams that are cross-connected, the half beam includes a first half beam and a second half beam connected to the middle of the main beam, and the main beam and the half beam are both spliced ​​together by multiple beam sections.

[0008] Optionally, the beam segment includes multiple spliced ​​beam segments and multiple joint beam segments, two adjacent spliced ​​beam segments are spliced ​​through the joint beam segment, and the splicing points between the spliced ​​beam segments and the joint beam segments are multi-layer plate splicing structures.

[0009] Optionally, the peripheral side reinforcement beam includes:

[0010] Two long perimeter side reinforcement beams, spaced parallel to each other in the longitudinal direction; and

[0011] Two short peripheral side reinforcement beams are arranged in parallel and spaced apart in the transverse direction;

[0012] The short-circumference side reinforcement beam is arranged closer to the center of the cross beam than the long-circumference side reinforcement beam.

[0013] Optionally, a plurality of mounting plates are provided on the side walls of the short circumference side reinforcement beam, which are arranged at intervals in the longitudinal direction and extend outward, and a mounting ear seat extends upward from the top side wall of the end of the load-sharing beam. The mounting ear seat is spliced ​​on the mounting plate and can move linearly in the vertical direction.

[0014] Optionally, the bottom beam frame includes a plurality of horizontal reinforcement beams, and the plurality of horizontal reinforcement beams are symmetrically arranged about a vertical center line of the cross beam.

[0015] Optionally, the end spacing of the cross beam is not less than 25m.

[0016] The second aspect of the present invention provides a base frame, which includes a base section, multiple diagonal braces and the above-mentioned bottom beam structure. The bottom end of the base section is installed on the cross beam, and the vertical center line of the base section is collinear with the vertical center line of the cross beam. Multiple diagonal braces are arranged along the circumference of the base section, and the two ends of the diagonal braces are respectively connected to the bottom beam structure and the main chord of the base section.

[0017] Optionally, the diagonal struts include multiple long diagonal struts and multiple short diagonal struts, the inner ends of the long diagonal struts are connected to the main chord, the outer ends of the long diagonal struts are connected to the end of the cross beam, the inner ends of the short diagonal struts are connected to the main chord and are located below the inner ends of the long diagonal struts, and the outer ends of the short diagonal struts are connected to the peripheral reinforcement beam.

[0018] Optionally, the cross beam includes a main beam and half beams connected in a cross-connected manner, the half beam includes a first half beam and a second half beam connected to the middle of the main beam, and the main beam and the half beam are both spliced ​​together by multiple beam segments;

[0019] The beam section includes multiple spliced ​​beam sections and multiple joint beam sections. Two adjacent spliced ​​beam sections are connected through the joint beam section. The connection between the spliced ​​beam section and the joint beam section is a multi-layer plate splicing structure, and the bottom end of the foundation section is installed on the joint beam section.

[0020] A third aspect of the present invention provides a mobile tower crane, comprising the above-mentioned underframe.

[0021] In the present invention, loads are transferred to the load-sharing beams via the circumferential reinforcement beams, the cross beams, and the horizontal reinforcement beams. These multiple load-sharing beams act as load-sharing devices, thereby improving the stability and load-bearing capacity of the base beam structure, making it suitable for large or extra-large mobile tower cranes. Furthermore, the load-sharing beams act like ballast, lowering the center of gravity of a mobile tower crane equipped with this base beam structure and eliminating the need for additional ballast.

[0022] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following detailed description, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 A schematic diagram of the underframe of an existing traveling tower crane;

[0025] Figure 2 for Figure 1 A top view of the underframe of an existing traveling tower crane;

[0026] Figure 3 A schematic diagram of an underframe of a mobile tower crane provided according to a specific embodiment of the present invention;

[0027] Figure 4 for Figure 3 A top view of the chassis in FIG.

[0028] Figure 5 for Figure 4 A top view of the cross beam in the chassis;

[0029] Figure 6 for Figure 5 Exploded view of the main beam in the cross beam;

[0030] Figure 7 for Figure 3 An enlarged view of point A of the chassis;

[0031] Figure 8 for Figure 7 One of the schematic diagrams of the enlarged image in another perspective;

[0032] Figure 9 for Figure 7 Schematic diagram 2 of the enlarged image in another perspective;

[0033] Figure 10 for Figure 3 One of the schematic diagrams of the chassis in conjunction with the transfer vehicle;

[0034] Figure 11 for Figure 3 The second schematic diagram of the chassis and transfer vehicle.

[0035] Explanation of the reference numerals: 1. Traditional underframe; 2. Standard section; 3. Ballast block; 4. Traditional bottom beam frame; 5. Travel wheel; 6. Track; 7. Traditional cross beam; 71. Traditional main beam; 72. Traditional half beam; 8. Tie rod; 10. Bottom beam structure; 11. Cross beam; 11a. Main beam; 11b. Half beam; 111. Main beam section; 1111. Joint lug seat; 112. Outer end beam section; 113. Joint Head beam section; 114, half beam section; 12, circumferential side reinforcement beam; 121, long circumferential side reinforcement beam; 122, short circumferential side reinforcement beam; 1221, installation plug plate; 13, load-sharing beam; 131, installation ear seat; 1311, waist-shaped pin hole; 14, horizontal reinforcement beam; 20, foundation section; 21, main chord; 30, diagonal brace; 31, long diagonal brace; 32, short diagonal brace; 40, transfer vehicle; 50, base. DETAILED DESCRIPTION

[0036] The following describes the specific implementation of the embodiment of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the embodiment of the present invention and is not used to limit the embodiment of the present invention.

[0037] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0038] In the embodiments of the present invention, unless otherwise specified, directional words such as "up, down, top, bottom" are usually used to describe the relative positional relationships of components in the directions shown in the drawings or in the vertical, perpendicular or gravity directions.

[0039] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with exemplary embodiments.

[0040] As previously mentioned, the conventional bottom beam frame 4 of existing traveling tower cranes has a simple structure and a load-bearing capacity that is not suitable for large or extra-large traveling tower cranes. Furthermore, a ballast weight 3 is required to lower the center of gravity and prevent the crane from tipping over. The present invention aims to provide a bottom beam structure with a stable structure and high load-bearing capacity suitable for large or extra-large traveling tower cranes.

[0041] Figure 3 It is a schematic diagram of an underframe of a mobile tower crane provided according to a specific embodiment of the present invention. Figure 4 for Figure 3 A top view of the chassis in FIG. Figure 3 and Figure 4As shown, a first exemplary embodiment of the present invention provides a sill structure comprising a sill frame and a plurality of load-sharing beams 13. The sill frame includes a cross beam 11, peripheral reinforcement beams 12, and horizontal reinforcement beams 14. The peripheral reinforcement beams 12 are connected to the ends of the cross beam 11, and the ends of the horizontal reinforcement beams 14 are connected to the peripheral reinforcement beams 12 and the cross beam 11, respectively. The plurality of load-sharing beams 13 are disposed below the sill frame and are arranged longitudinally and in parallel with each other.

[0042] Specifically, the bottom beam structure is an important component of the mobile tower crane. The deadweight and load of the tower crane both act on the bottom beam structure. The stability of the bottom beam structure plays a vital role in the stability of the tower crane itself. In the bottom beam structure, the load is transferred to the load-sharing beam 13 through the bottom beam frame, that is, the load is transferred to the load-sharing beam 13 through the circumferential reinforcement beam 12, the cross beam 11 and the horizontal reinforcement beam 14. The multiple load-sharing beams 13 play a load-sharing role, thereby improving the stability and load-bearing capacity of the bottom beam structure 10, so that the bottom beam structure can be adapted to large or extra-large mobile tower cranes. It can be understood that the track gauge (the end spacing of the cross beam 11) of large or extra-large mobile tower cranes is larger, so the size of the load-sharing beam 13 installed on the bottom beam frame is also larger, and its weight is also heavier. The center of gravity of the mobile tower crane equipped with the bottom beam structure is lower, avoiding the additional installation of the ballast block 3.

[0043] As mentioned above, the bottom beam structure is applicable to large or super-large mobile tower cranes. Specifically, the bottom beam structure is applicable to mobile tower cranes with a track gauge of not less than 25 m, that is, the end spacing of the cross beam 11 is not less than 25 m.

[0044] In an optional embodiment, the cross beam 11 can be formed by cross-connecting two whole beams. Those skilled in the art will understand that the weight of the tower crane and the vertical load of the operation are mainly borne by the cross beam 11. This places high requirements on the structural strength of the two whole beams, and it is necessary to ensure that the whole beams are not easily deformed.

[0045] It should be noted that if Figure 2 As shown, the conventional cross beam 7 is constructed by cross-jointing a conventional main beam 71 and two conventional half beams 72. Both the conventional main beam 71 and the conventional half beams 72 are integral beams. As previously mentioned, for large or extra-large mobile tower cranes, the use of integral beams to form the cross beam 11 requires high structural strength for the entire beam and is also inconvenient to transport. Clearly, the assembled structure of the conventional cross beam 7 is not suitable for large or extra-large tower cranes.

[0046] In order to achieve a large track gauge and facilitate transportation, in a preferred embodiment, each beam constituting the cross beam 11 adopts a segmented assembly structure. Figure 5 for Figure 4A top view of the cross beam in the chassis. Figure 5 As shown, specifically, the cross beam 11 includes a cross-connected main beam 11a and a half beam 11b, the half beam 11b includes a first half beam and a second half beam connected to the middle of the main beam 11a, and the main beam 11a and the half beam 11b are both spliced ​​together by multiple beam sections.

[0047] In this embodiment, the cross beam 11 is formed by splicing multiple beam segments to achieve an end spacing of not less than 25m. For example, the beam segments can be spliced ​​together by screwing, pinning, or welding to form the main beam 11a and the half beams 11b.

[0048] In an optional embodiment, the cross beam 11 further includes multiple outer sleeves, each sleeve being provided at the joint between two adjacent beam segments for securing. For example, the outer sleeves are fixedly connected to the beam segments by inserting pins therein. Thus, the two adjacent beam segments are spliced ​​together to form the main beam 11a and the half beam 11b. However, the structural strength of the main beam 11a and the half beam 11b formed by the outer sleeve splicing structure is generally low.

[0049] In a preferred embodiment, the beam segment includes multiple spliced ​​beam segments and multiple joint beam segments 113. Two adjacent spliced ​​beam segments are spliced ​​through the joint beam segment 113. The splicing point between the spliced ​​beam segment and the joint beam segment 113 is a multi-layer plate splicing structure.

[0050] like Figure 5 As shown, in the illustrated embodiment, the spliced ​​beam segments include a main beam segment 111, two half beam segments 114, and four outer end beam segments 112, and the number of joint beam segments 113 is four. The main beam 11a is spliced ​​together by a main beam segment 111, two joint beam segments 113, and two outer end beam segments 112. Both outer end beam segments 112 are connected to the ends of the main beam segment 111 through the joint beam segments 113. The first half beam and the second half beam are each spliced ​​together by a half beam segment 114, a joint beam segment 113, and an outer end beam segment 112. The inner end of the half beam segment 114 is connected to the middle of the main beam segment 111, and the outer end of the half beam segment 114 is connected to the outer end beam segment 112 through the joint beam segment 113. In this way, the cross beam 11 is formed by splicing the beam segments.

[0051] exist Figure 5 In the illustrated embodiment, the main beam 11a is mainly composed of five beam segments, the first half beam and the second half beam are both composed of three beam segments, and the main beam 11a and the half beam 11b can also be composed of more beam segments, that is, the constituent beam segments of the main beam 11a and the half beam 11b are not limited to the illustrated embodiment, as long as the end spacing of the cross beam 11 meets the requirements and the strength meets the standards.

[0052] In this embodiment, the joint beam section 113 is located at the joint of two adjacent spliced ​​beam sections. Since the joint between the spliced ​​beam section and the joint beam section 113 is a multi-layer plate splicing structure, the joint beam section 113 is equivalent to serving as a structural reinforcement point of the main beam 11a and the half beam 11b. This makes the cross beam 11 have a higher structural strength and prevents the cross beam 11 from causing large deformation due to load-bearing.

[0053] Figure 6 for Figure 5 Exploded view of the main beam in the cross beam. Figure 6 As shown, the beam section includes two vertical plates, a top plate and a bottom plate. The two vertical plates are arranged parallel to each other in the width direction of the beam section. The top plate and the bottom plate are respectively arranged on the top side wall and the bottom side wall of the vertical plates, so that the cross section is in the shape of "Ⅱ". Taking the joint of the outer end beam section 112 and the main beam section 111 as an example, the inner end of the outer end beam section 112 and the end of the main beam section 111 are formed with two joint splicing ears 1111 arranged parallel to each other in the width direction of the beam section. The joint splicing ears 1111 are provided with pin holes and are composed of two layers of vertical plates arranged parallel to each other in the width direction. The vertical plate of the joint beam section 113 is provided with pin holes and can be inserted into the joint splicing ears 1111. After the joint beam section 113 and the joint splicing ear seat 1111 are spliced ​​together, the pin holes on the two are aligned with each other. After inserting the pin, the outer end beam section 112 and the main beam section 111 can be spliced ​​through the joint beam section 113. The vertical plate layer plates at the splicing of the outer end beam section 112 and the joint beam section 113 and the main beam section 111 and the joint beam section 113 reach 6 layers. Obviously, each joint beam section 113 on the main beam 11a and the half beam 11b is a structural reinforcement point.

[0054] Those skilled in the art will understand that the strength of the joint can be changed by changing the number of vertical plates in the joint splicing ear seat 1111 or the joint beam section 113, and the number of plate layers at the joint can be appropriately adjusted according to needs. Preferably, the number of plate layers at the splicing of the beam section and the joint beam section 113 is not less than 6 layers.

[0055] In an embodiment of the present invention, the circumferential reinforcement beams 12 include two long circumferential reinforcement beams 121 and two short circumferential reinforcement beams 122. The two long circumferential reinforcement beams 121 are arranged longitudinally and parallel to each other. The two short circumferential reinforcement beams 122 are arranged transversely and parallel to each other. The short circumferential reinforcement beams 122 are arranged closer to the center of the cross beam 11 than the long circumferential reinforcement beams 121.

[0056] Figure 10 for Figure 3 One of the schematic diagrams of the chassis in conjunction with the transfer vehicle. Figure 11 for Figure 3 The second diagram of the chassis and transfer vehicle. Figure 10 and Figure 11As shown, a mobile tower crane with this base beam structure requires a transfer vehicle 40 for position adjustment. Specifically, four bases 50 are located below the base beam frame, one at each end of the cross beam 11. When not in transit, these four bases 50 support the entire mobile tower crane. The transfer vehicle 40, which has a jacking function, must be inserted from one side of the tower crane between the base beam frame and the ground to lift the entire tower crane for transport.

[0057] As mentioned above, the transfer vehicle 40 needs to pass through from one side of the tower crane. Preferably, the transfer vehicle 40 passes through from one side of the long-circumference side reinforcement beam 121. The long-circumference side reinforcement beam 121 can better support the transfer vehicle 40, and there is a larger lateral movement space during the process of passing through from the side of the long-circumference side reinforcement beam 121, reducing the risk of interference.

[0058] Furthermore, a plurality of mounting plates 1221 are provided on the side wall of the short circumference side reinforcement beam 122, which are arranged at intervals along the longitudinal direction and extend outward. A mounting ear seat 131 extends upward from the top side wall of the end of the load-sharing beam 13. The mounting ear seat 131 is spliced ​​on the mounting plate 1221 and can move linearly in the vertical direction.

[0059] Specifically, both ends of the load-sharing beam 13 are respectively connected to the two short-circumference side reinforcement beams 122 , and the load-sharing beam 13 can also move vertically, that is, the ends of the load-sharing beam 13 are movably connected to the short-circumference side reinforcement beams 122 . Figure 8 for Figure 7 One of the schematic diagrams of the enlarged image in another perspective. Figure 7 As shown, when the tower crane is not in transport, there is a gap between the load-sharing beam 13 and the short-circumference side reinforcement beam 122 . Figure 9 for Figure 7 The second schematic diagram of the enlarged image in another perspective. Figure 9 As shown, in the transport state, the transfer vehicle 40 penetrates from the long-circumference side reinforcement beam 121 and lifts the entire tower crane, so that the load-sharing beam 13 abuts the short-circumference side reinforcement beam 122. It can be understood that the load-sharing beam 13 bends after being loaded, so the bending displacement at both ends is relatively large. The end of the load-sharing beam 13 is movably connected to the short-circumference side reinforcement beam 122, so that the load-sharing beam 13 has bending space. Compared with the solution of rigidly connecting the mounting plate 1221 and the mounting ear seat 131, this can significantly reduce the load-bearing capacity requirements of the mounting plate 1221 and the mounting ear seat 131.

[0060] Figure 7 for Figure 3 The enlarged view of the bottom frame at point A. Figure 7As shown, in the illustrated embodiment, the mounting lug 131 is provided with a waist-shaped latch hole 1311, and the mounting plate 1221 is provided with a latch hole. After the mounting lug 131 is spliced ​​onto the mounting plate 1221, the waist-shaped latch hole 1311 on the mounting lug 131 is aligned with the latch hole on the mounting plate 1221. After the latch is inserted, the load-sharing beam 13 is connected to the short-circuit side reinforcement beam 122. The latch can move within the waist-shaped latch hole, that is, the load-sharing beam 13 can move linearly in the vertical direction. Of course, the connection method between the load-sharing beam 13 and the short-circuit side reinforcement beam 122 is not limited to the illustrated embodiment, such as the connection structure of a slider and a slide groove.

[0061] As previously mentioned, the load-sharing beams 13 will bend when loaded. The longer they are, the greater the displacement at both ends due to bending. Therefore, it is preferable to appropriately shorten the length of the load-sharing beams 13. By increasing the number of load-sharing beams 13, the structural strength of the bottom beam frame can be enhanced. Therefore, it is preferable to connect the load-sharing beams 13 to the short circumferential reinforcement beams 122 closer to the center of the cross beam 11. Accordingly, the load-sharing beams 13 are also shorter. Secondly, the long circumferential reinforcement beams 121 facilitate the insertion of the transfer vehicle 40. Therefore, in this embodiment, the circumferential reinforcement beams 12 use a combination of long and short beams.

[0062] In an embodiment of the present invention, the bottom beam frame includes a plurality of horizontal reinforcement beams 14, which are symmetrically arranged about the vertical centerline of the cross beam 11. Specifically, to ensure the structural strength of the bottom beam structure 10, the horizontal reinforcement beams 14 are added to further enhance the strength of the bottom beam structure 10.

[0063] In the illustrated embodiment, the cross beam 11 and the peripheral reinforcing beams 12 form a bottom beam frame, which can be divided into four large triangular frames arranged around the vertical center line. Two horizontal reinforcing beams 14 are provided in each triangular frame to divide the large triangular frame into multiple small triangular frames, thereby improving the structural strength of the entire bottom beam structure 10.

[0064] The second aspect of the present invention provides a base frame, which includes a base section 20, multiple diagonal braces 30 and the above-mentioned bottom beam structure 10. The bottom end of the base section 20 is installed on the cross beam 11, and the vertical center line of the base section 20 is collinear with the vertical center line of the cross beam 11. Multiple diagonal braces 30 are arranged along the circumference of the base section 20, and the two ends of the diagonal braces 30 are respectively connected to the bottom beam structure 10 and the main chord 21 of the base section 20.

[0065] Specifically, the tower body is formed by splicing standard sections along the height direction on the foundation section 20, and the diagonal bracing rods 30 serve to support the tower body. It can be understood that since the base frame includes the above-mentioned bottom beam structure 10, it obviously has all the beneficial effects brought by the above-mentioned bottom beam structure 10, and no further details will be given here.

[0066] Furthermore, the diagonal struts 30 include a plurality of long diagonal struts 31 and a plurality of short diagonal struts 32, the inner ends of the long diagonal struts 31 are connected to the main chord 21, the outer ends of the long diagonal struts 31 are connected to the end of the cross beam 11, the inner ends of the short diagonal struts 32 are connected to the main chord 21 and are located below the inner ends of the long diagonal struts 31, and the outer ends of the short diagonal struts 32 are connected to the circumferential reinforcement beam 12.

[0067] As previously mentioned, this mobile tower crane requires transport via a transfer vehicle 40. Due to factors such as road slope and braking, the tower body exerts a significant bending moment on the underframe along the transport direction. Therefore, in this embodiment, a combination of long diagonal braces 31 and short diagonal braces 32 is employed to achieve load transfer and enhance structural strength. One end of the short diagonal brace 32 is connected to the peripheral reinforcement beam 12, enhancing its rigidity and preventing significant bending of the peripheral reinforcement beam 12 and the load-sharing beam 13 due to excessive load.

[0068] In an optional preferred embodiment, the cross beam 11 includes a cross-connected main beam 11a and a half beam 11b, the half beam 11b includes a first half beam and a second half beam connected to the middle of the main beam 11a, the main beam 11a and the half beam 11b are both spliced ​​together by multiple beam sections, the beam sections include multiple spliced ​​beam sections and multiple joint beam sections, two adjacent spliced ​​beam sections are connected by a joint beam section 113, the connection between the spliced ​​beam section and the joint beam section 113 is a multi-layer plate splicing structure, and the bottom end of the foundation node 20 is installed on the joint beam section 113.

[0069] As mentioned above, the joint beam section 113 is the structural strength reinforcement point of the main beam 11a and the half beam 11b. Therefore, it is preferred to set the bottom end of the foundation node 20 on the joint beam section 113 so that the chassis has better structural strength.

[0070] The third aspect of the present invention provides a mobile tower crane, which includes the above-mentioned underframe. Since the mobile tower crane has the above-mentioned underframe, it obviously has all the beneficial effects brought by the above-mentioned underframe, which will not be repeated here.

[0071] In summary, the present invention aims to provide a base beam structure 10 with improved structural strength and a larger span. The base frame equipped with this base beam structure 10 also has improved structural strength, enabling the base frame to serve as an important load-bearing component for large or quasi-large mobile tower cranes transported by transfer vehicles 40. Secondly, because the mobile tower crane can be transported by the transfer vehicle, the transfer direction and length of the mobile tower crane are not restricted by the rails 6, resulting in strong maneuverability, a wide operating area, and higher efficiency without the need for pre-laid rails.

[0072] The above describes in detail the optional implementation methods of the embodiments of the present invention in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above implementation methods. Within the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the scope of protection of the embodiments of the present invention.

[0073] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0074] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the embodiments of the present invention will no longer separately describe various possible combinations.

[0075] In addition, various implementations of the embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the embodiments of the present invention, they should also be regarded as the contents disclosed in the embodiments of the present invention.

Claims

1. A bottom beam structure, characterized in that: The bottom beam structure (10) comprises: A bottom beam frame, comprising a cross beam (11), a circumferential reinforcement beam (12), and a horizontal reinforcement beam (14), wherein the circumferential reinforcement beam (12) is connected to the end of the cross beam (11), and both ends of the horizontal reinforcement beam (14) are respectively connected to the circumferential reinforcement beam (12) and the cross beam (11); and A plurality of load-sharing beams (13) are arranged below the bottom beam frame and are arranged in parallel and spaced apart in the longitudinal direction; and The peripheral side reinforcement beam (12) comprises: Two long circumferential side reinforcement beams (121) are arranged in parallel and spaced apart in the longitudinal direction; and Two short-circumference side reinforcement beams (122) are arranged in parallel and spaced apart in the transverse direction; wherein the short-circumference side reinforcement beams (122) are arranged closer to the center of the cross beam (11) than the long-circumference side reinforcement beams (121); A plurality of mounting plug plates (1221) arranged at intervals in the longitudinal direction and extending outward are provided on the side wall of the short circumference side reinforcement beam (122); a mounting ear seat (131) extends upward on the top side wall of the end portion of the load-sharing beam (13); the mounting ear seat (131) is spliced ​​on the mounting plug plate (1221) and can move linearly in the vertical direction; a waist-shaped pin hole (1311) is provided on the mounting ear seat (131); a pin hole is provided on the mounting plug plate (1221); the waist-shaped pin hole (1311) on the mounting ear seat (131) is aligned with the pin hole on the mounting plug plate (1221); the pin can move in the waist-shaped pin hole (1311), thereby enabling the load-sharing beam (13) to move linearly in the vertical direction; When the tower crane is in a non-transportation state, a gap exists between the load-sharing beam (13) and the short-circumference side reinforcement beam (122); when the tower crane is in a transporting state, the transport vehicle (40) penetrates from the side of the long-circumference side reinforcement beam (121) and lifts the entire tower crane, so that the load-sharing beam (13) abuts against the short-circumference side reinforcement beam (122).

2. The bottom beam structure according to claim 1, characterized in that: The cross beam (11) comprises a main beam (11a) and a half beam (11b) connected in a cross-connected manner; the half beam (11b) comprises a first half beam and a second half beam connected to the middle of the main beam (11a); the main beam (11a) and the half beam (11b) are both formed by splicing a plurality of beam sections.

3. The bottom beam structure according to claim 2, characterized in that: The beam section comprises a plurality of spliced ​​beam sections and a plurality of joint beam sections (113), two adjacent spliced ​​beam sections are spliced ​​via the joint beam section (113), and the splicing locations between the spliced ​​beam sections and the joint beam sections (113) are multi-layer plate splicing structures.

4. The bottom beam structure according to claim 1, characterized in that: The bottom beam frame comprises a plurality of horizontal reinforcement beams (14), and the plurality of horizontal reinforcement beams (14) are symmetrically arranged about the vertical center line of the cross beam (11).

5. The bottom beam structure according to any one of claims 1 to 4, characterized in that: The end spacing of the cross beam (11) is not less than 25m.

6. A chassis, characterized in that: The base frame includes a base section (20), a plurality of diagonal bracing rods (30) and a bottom beam structure (10) according to claim 1, wherein the bottom end of the base section (20) is mounted on the cross beam (11), the vertical center line of the base section (20) is collinear with the vertical center line of the cross beam (11), the plurality of diagonal bracing rods (30) are arranged along the circumference of the base section (20), and the two ends of the diagonal bracing rods (30) are respectively connected to the bottom beam structure (10) and the main chord (21) of the base section (20).

7. The chassis according to claim 6, wherein: The diagonal bracing rods (30) include a plurality of long diagonal bracing rods (31) and a plurality of short diagonal bracing rods (32), wherein the inner ends of the long diagonal bracing rods (31) are connected to the main chord (21), the outer ends of the long diagonal bracing rods (31) are connected to the end of the cross beam (11), the inner ends of the short diagonal bracing rods (32) are connected to the main chord (21) and are located below the inner ends of the long diagonal bracing rods (31), and the outer ends of the short diagonal bracing rods (32) are connected to the peripheral reinforcement beam (12).

8. The chassis according to claim 6, wherein: The cross beam (11) comprises a main beam (11a) and a half beam (11b) connected in a cross-connected manner, the half beam (11b) comprising a first half beam and a second half beam connected to the middle of the main beam (11a), and the main beam (11a) and the half beam (11b) are both formed by splicing a plurality of beam sections; The beam section comprises a plurality of spliced ​​beam sections and a plurality of joint beam sections (113), two adjacent spliced ​​beam sections are connected via the joint beam section (113), the connection between the spliced ​​beam section and the joint beam section (113) is a multi-layer plate splicing structure, and the bottom end of the foundation section (20) is mounted on the joint beam section (113).

9. A mobile tower crane, characterized in that: The mobile tower crane comprises an undercarriage according to any one of claims 6 to 8.

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