Bridge erecting machine supporting structure

Abstract

The utility model belongs to the technical field of civil engineering, and particularly relates to a bridge erecting machine supporting structure. The bridge girder erection machine supporting structure comprises a front supporting leg support and a middle supporting leg support. The front supporting leg support is arranged on the ground and located at the bottom of the front supporting leg, the front supporting leg support comprises a base, a supporting body and a distribution beam which are sequentially stacked in the vertical direction, the face, away from the supporting body, of the base makes contact with the ground, and the face, away from the supporting body, of the distribution beam makes contact with the bottom of the front supporting leg; the middle supporting leg is arranged on the installed box girder in a supporting mode and located at the bottom of the middle supporting leg. By means of the bridge girder erection machine supporting structure in the technical scheme, installation of the super-large longitudinal slope box girder can be achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to civil engineering technical field, and specifically relates to a bridge girder erection machine support structure. BACKGROUND

[0002] With the rapid development of various engineering projects at home and abroad, prestressed construction technology has been very mature, and bridge construction gradually develops towards larger span and more freedom. Prefabricated box girder is widely applied to various engineering projects with the advantages of accelerating engineering progress, saving construction period, convenient maintenance and replacement and the like. In the engineering construction process, prefabricated box girder erection plays an important role, and box girder erection is related to the feasibility of completed bridge, the quality of subsequent engineering construction and the safety performance and maintainability of the whole bridge.

[0003] At present, for various different engineering projects, different types of bridge erection equipment can be selected in prefabricated box girder erection, and the complex environment and construction conditions on site also put forward different challenges to the bridge erection equipment, promote the development of the bridge erection equipment and the innovation of the bridge erection method. When the prefabricated box girder is installed by using the bridge girder erection machine, when the installation longitudinal slope of the large-span bridge is more than about 2%, generally, the front support leg and the middle support leg of the bridge girder erection machine need to be connected or the heightening section needs to be removed to adjust the whole height of the bridge girder erection machine, so as to make up for the influence of the front and rear height difference of the bridge longitudinal slope on the bridge girder erection machine, which not only is low in construction efficiency, but also increases the safety risk. Moreover, limited by the mechanical performance indexes or safety requirements such as the hoisting beam weight, span, structure size of the front support leg and width of the bent cap, the method of using the heightening section cannot complete the installation of the super large longitudinal slope bridge. At present, the erection limit longitudinal slope of the general bridge girder erection machine is about 3.5%, which is only suitable for the installation of the bridge under the domestic municipal design specification, and is not suitable for the erection of the prefabricated box girder with larger longitudinal slope and the need of some international bridge construction.

[0004] In order to solve the problem that the bridge longitudinal slope exceeds the installation slope limit of the bridge girder erection machine which can be directly installed and connected with the heightening section, it is very necessary to propose a bridge girder erection machine support structure. UTILITY MODEL CONTENTS

[0005] The utility model discloses a bridge girder erection machine support structure suitable for large longitudinal slope prefabricated box girder erection.

[0006] The utility model discloses a bridge girder erection machine support structure, the bridge girder erection machine includes the front support leg and the middle support leg, the bridge girder erection machine support structure includes:

[0007] The front support leg support is arranged on the ground and located at the bottom of the front support leg, and the front support leg support includes a base, a support body and a distribution beam which are sequentially stacked along the vertical direction, one side of the base away from the support body is in contact with the ground, and one side of the distribution beam away from the support body is in contact with the bottom of the front support leg.

[0008] The middle support is arranged on the installed box girder and is located at the bottom of the middle support.

[0009] The front support in the technical solution supports and increases the height of the front support through the support body; the local stress is dispersed through the base to avoid direct contact between the support body and the ground, thereby avoiding instability and damage of the ground due to bearing of excessive stress, and avoiding deformation and damage of the support body due to direct contact with the ground; the distribution beam is arranged above the support body to uniformly transmit the force of the front support to each node on the top surface of the support body, thereby ensuring the stability and safety of the structure. Due to the heightening of the front support, the middle support adjusts the height of the bridge-erecting machine to ensure that the top surface of the longitudinal beam of the bridge-erecting machine meets the requirements of the travelling crane, thereby successfully completing the installation of the super-long longitudinal slope box girder. The bridge-erecting machine support structure in the technical solution can be used to install the super-long longitudinal slope (slope ≥ 7.07%) box girder, breaks through the limit value of the existing domestic specification longitudinal slope, breaks through the limit of the longitudinal slope of the ordinary bridge-erecting machine, and breaks the record of the maximum installation longitudinal slope 7% of the bridge. The method is suitable for the bridge with a longitudinal slope greater than 7.07%, and is also suitable for the installation of other precast box girders in the case of limited conditions. Compared with the traditional construction process, the large longitudinal slope box girder installation needs to use large ground hoisting equipment or specially-made bridge-erecting machines, and the technical solution reduces the cost of using large or special equipment, is more economical and has stronger adaptability, and can create better economic benefits. The bridge-erecting machine support structure is more suitable for mountainous areas, backward areas (Africa, South America, etc.), projects with limited mechanical equipment and operation space, and has good popularization value. The bridge-erecting machine support structure is a temporary structure, has strong adaptability, can be adjusted according to the slope of the box girder, has simple structure, convenient installation and disassembly, can effectively shorten the construction period, save costs, improve benefits, and has high structural stability and safety, and can be used in areas with limited environment, small space and shortage of equipment.

[0010] In addition, the bridge-erecting machine support structure can have the following additional technical features.

[0011] In some embodiments of the utility model, the support body includes a plurality of support frames sequentially arranged in the vertical direction.

[0012] In some embodiments of the utility model, the support frames are detachably connected.

[0013] In some embodiments of the utility model, the front support and the bent cap are longitudinally arranged adjacent to each other, the support frame and the adjacent bent cap are connected through a pull rod, and the longitudinal direction is the length direction of the box girder.

[0014] In some embodiments of this utility model, the supporting body is a liftable structure.

[0015] In some embodiments of this utility model, the distribution beam includes a plurality of distribution members arranged sequentially in a horizontal direction, the top of the distribution member is in contact with the bottom of the front support leg, and the bottom of the distribution member is in contact with the top of the support body.

[0016] In some embodiments of this utility model, the distribution component includes a first support portion, a vertical support portion, and a second support portion connected in sequence. The first support portion and the second support portion are horizontally arranged. The two ends of the vertical support portion are vertically connected to the first support portion and the second support portion, respectively. The side of the first support portion away from the vertical support portion contacts the bottom of the front support leg, and the side of the second support portion away from the vertical support portion contacts the top of the support body.

[0017] In some embodiments of this utility model, the base includes a concrete pad.

[0018] In some embodiments of this utility model, the number of concrete pads is multiple, and the multiple concrete pads are spaced apart along the length direction of the front support leg.

[0019] In some embodiments of this utility model, the middle support leg includes a concrete pad. Attached Figure Description

[0020] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0021] Figure 1 A schematic diagram of the bridge erecting machine support structure according to an embodiment of the present invention during operation is shown.

[0022] Figure 2 A schematic cross-sectional view of the front support leg according to an embodiment of the present invention is shown.

[0023] Figure 3 for Figure 2 A magnified view of a section at point A in the middle;

[0024] Figure 4 A schematic cross-sectional view of the middle support leg according to an embodiment of the present invention is shown.

[0025] The labels in the attached diagram are as follows:

[0026] 100. Bridge erecting machine; 110. Front support leg; 111. Heightening section; 120. Middle support leg; 130. Overhead crane; 200. Box girder; 300. Cap beam; 400. Front support leg support; 410. Base; 420. Support body; 421. Support frame; 430. Distribution beam; 431. Distribution component; 4311. First support section; 4312. Vertical support section; 4313. Second support section; 500. Middle support leg support. Detailed Implementation

[0027] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0028] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0029] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0030] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations.

[0031] Domestic municipal bridge design specifications require that the maximum longitudinal slope of bridges on busy road sections be approximately 3%, and the maximum longitudinal slope of highway bridges be 4%. Under these conditions, the front outriggers of the bridge erecting machine can directly support themselves on the cap beam to meet the requirements for crane movement. For slopes greater than 3% but less than 5%, extension sections can be added to the front outriggers to accommodate the crane movement. However, if the longitudinal slope is even greater, the height difference between the front and rear of the bridge erecting machine will be very large. For example, with a slope of 7.07%, the height difference increases by nearly 5 meters (meaning that even with extension sections, the front outrigger is still nearly 1.5 meters below the top of the cap beam). Continuing to add extension sections to the front outriggers would cause mechanical properties such as slenderness ratio to fail to meet safety requirements, potentially leading to structural instability. Furthermore, changing the dimensions of the front outriggers, such as increasing their cross-section, would result in insufficient cap beam width (operating space). The bridge erecting machine support structure provided in this technical solution effectively solves these problems.

[0032] Figure 1 A schematic diagram of the bridge erecting machine support structure according to an embodiment of the present invention during operation is shown. Figure 2 A schematic cross-sectional view of the front support leg 110 according to an embodiment of the present invention is shown. Figure 3 for Figure 2 A magnified view of a portion of point A in the middle. Figure 4 A schematic cross-sectional view of the middle support leg 120 according to an embodiment of the present invention is shown. Figures 1 to 4As shown, this utility model proposes a support structure for a bridge erecting machine. The bridge erecting machine 100 includes a front support leg 110 and a middle support leg 120. The support structure for the bridge erecting machine includes a front support leg support 400 and a middle support leg support 500. The front support leg support 400 is set on the ground and located at the bottom of the front support leg 110. The front support leg support 400 includes a base 410, a support body 420, and a distribution beam 430 stacked vertically in sequence. The side of the base 410 facing away from the support body 420 is in contact with the ground, and the side of the distribution beam 430 facing away from the support body 420 is in contact with the bottom of the front support leg 110. The middle support leg support 500 is set on the installed box girder 200 and located at the bottom of the middle support leg 120.

[0033] In this technical solution, the front outrigger support 400, through the support body 420, serves to support and increase the height of the front outrigger 110. By setting up a base 410 to disperse local stress, the support body 420 is prevented from directly contacting the ground, thus avoiding significant ground settlement and instability due to excessive stress. Simultaneously, the support body 420 is prevented from experiencing large local stress due to direct contact with the ground, which could lead to deformation and damage. A distribution beam 430 is installed above the support body 420 to evenly transmit the force of the front outrigger 110 to each node on the top surface of the support body 420, thereby ensuring the stability and safety of the structure. Due to the increased height of the front outrigger 110, the middle outrigger 120 uses a middle outrigger support 500 to adjust the height of the bridge erecting machine 100, ensuring that the top surface of the longitudinal beam of the bridge erecting machine 100 meets the travel requirements of the overhead crane 130, thus successfully completing the installation of the ultra-large longitudinal slope box girder 200. By utilizing the bridge erecting machine support structure in this technical solution, the installation of box girders 200 with ultra-large longitudinal slopes (slope ≥ 7.07%) can be achieved, breaking through the limits of existing domestic standards for longitudinal slopes. It also surpasses the longitudinal slope limits that ordinary bridge erecting machines 100 can install directly or with added height sections 111, and breaks the current record for the largest recorded installation longitudinal slope of 7%. This method is also suitable for bridges with longitudinal slopes greater than 7.07%, and of course, for other situations where this structure is used due to limited conditions. Compared to traditional construction methods, where the installation of large longitudinal slope box girders 200 requires large ground lifting equipment or a specially designed bridge erecting machine 100, this technical solution reduces the cost of using large or specialized equipment, making it more economical, more adaptable, and capable of generating better economic benefits. This technical solution is more suitable for projects in mountainous areas, underdeveloped regions (Africa, South America, etc.), and where machinery and operating space are limited, and has significant potential for widespread adoption. The bridge erecting machine support structure in this technical solution is a temporary structure with strong adaptability. It can be adjusted according to the 200° slope of the box girder. The structure is simple, easy to install and dismantle, and can effectively shorten the construction period, save costs and improve efficiency. In addition, the structure has high stability and safety, and can be used in areas with limited environment, small space and shortage of equipment.

[0034] Further, see Figure 2The supporting structure 420 includes multiple support frames 421 erected sequentially along the vertical direction. By using multiple support frames 421, the front outrigger 110 can be raised to a suitable height, and using multiple support frames 421 avoids the problem of excessively tall support frames 421 that would be difficult to assemble and transport. Optionally, the support frame 421 can be a Bailey bridge, which is made of steel and has high load-bearing capacity and structural rigidity, capable of withstanding large loads, thus ensuring the stability and safety of the supporting structure. Furthermore, the Bailey bridge consists of uprights, horizontal bars, and diagonal braces, with a simple structure, lightweight yet robust design, and can be quickly assembled and disassembled, facilitating transportation and installation, making it very suitable for the construction of temporary supports.

[0035] Furthermore, adjacent support frames 421 are detachably connected. By reinforcing the connection between adjacent support frames 421, the stability of the structure can be ensured. Optionally, adjacent support frames 421 are detachably connected via threaded connectors, which can be reinforcing chord bolts.

[0036] Furthermore, the front support leg 400 and the cap beam 300 are arranged adjacent to each other longitudinally, and the support frame 421 and the adjacent cap beam 300 are connected by tie rods, with the longitudinal direction being the length of the box girder 200. Connecting the support frame 421 and the cap beam 300 by tie rods increases the longitudinal thrust resistance of the support frame 421. Although empirical calculations show that the support frame 421 is longitudinally stable during the installation of the box girder 200, adding tie rods between the support frame 421 and the cap beam 300 provides greater assurance. Optionally, the tie rods can be steel reinforcement tie rods.

[0037] Optionally, in some embodiments, the support body 420 can be a liftable structure, such as a jack.

[0038] Further, see Figure 2 and Figure 3 The distribution beam 430 includes a plurality of distribution members 431 arranged in sequence along the horizontal direction. The top of the distribution member 431 contacts the bottom of the front support leg 110, and the bottom of the distribution member 431 contacts the top of the support body 420.

[0039] Generally speaking, the lower end of the front support leg 110 of the bridge erecting machine 100 is a transverse I-beam (which is built into the bridge erecting machine 100 and is also an important and indispensable component for the transverse stability of the bridge erecting machine 100). In order to transmit the force of this transverse I-beam to each node on the top surface of the support frame 421 more evenly, a distribution component 431 is set at each node on the top surface of the support frame 421.

[0040] Furthermore, the distribution component 431 includes a first support portion 4311, a vertical support portion 4312, and a second support portion 4313 connected in sequence. The first support portion 4311 and the second support portion 4313 are arranged horizontally. The two ends of the vertical support portion 4312 are respectively vertically connected to the first support portion 4311 and the second support portion 4313. The side of the first support portion 4311 facing away from the vertical support portion 4312 contacts the bottom of the front support leg 110, and the side of the second support portion 4313 facing away from the vertical support portion 4312 contacts the top of the support body 420.

[0041] Understandably, the distribution member 431, with this structural form, can provide stable longitudinal support and play a role in distributing loads, effectively transferring the force of the transverse I-beam at the lower end of the front outrigger 110 to the nodes on the top surface of the support frame 421 relatively evenly. Optionally, the distribution member 431 can be an I-beam structure. As a common type of steel, the I-beam has a unique I-shaped cross-section design. The flanges of the I-beam can provide greater bending strength, while the web can withstand greater shear force, which allows the I-beam to effectively distribute and bear loads.

[0042] Furthermore, the base 410 is a concrete pad. Since the site surface is an old roadbed, it cannot withstand the localized stress at the bottom of the support frame 421. Therefore, a stress transfer layer must be provided to convert large localized stresses into smaller stresses over a larger area. The concrete pad can effectively convert large localized stresses into smaller stresses over a larger area. Understandably, to enhance overall stability, the base 410 needs to have certain compressive and flexural strength, while also meeting the requirements for stress diffusion angle. Therefore, the concrete pad must meet certain area and thickness requirements.

[0043] Optionally, the base 410 may contain multiple concrete blocks, which are spaced apart along the length of the front support leg 110. The spaced-apart concrete blocks can save material usage while meeting operational requirements.

[0044] Optionally, the concrete used for the base 410 is C30 (under standard curing conditions, the average compressive strength per cubic meter of concrete is not less than 30 MPa). This is because during construction, all other structures were constructed with C30 concrete. Since the foundation volume is small, using general-purpose C30 concrete allows it to be transported to the site from the centralized mixing plant along with the concrete for other structures. In this embodiment, mechanical calculations show that using two 4m (length) * 1.5m (width) * 0.4m (height) C30 concrete blocks as the base 410 meets the site requirements.

[0045] Further, see Figure 4The middle support leg 500 is a concrete pad. Understandably, the height of the concrete pad is determined based on the distance from the bottom of the middle support leg 120 to the top of the cap beam 300, thus ensuring the middle support leg 120 is at a suitable height and that the overhead crane can operate smoothly. Optionally, the concrete pad in the middle support leg 500 can be C30.

[0046] Furthermore, the number of concrete pads in the middle outrigger support 500 is multiple, and these concrete pads are spaced apart along the length of the middle outrigger 120. Understandably, by using multiple concrete pads, local stress can be distributed, while simultaneously reducing material usage.

[0047] Taking a box girder with a slope of 7.07% (200mm) as an example, the method for setting up the bridge erecting machine support structure provided in this technical solution is explained:

[0048] Based on the overall modeling calculations, the total support reaction force of the front outrigger 110 is 1135.4 kN, requiring the bearing capacity of the base 410 to be no less than 30 kN. Based on the simulation calculation results and the height difference between the bottom and the base surface of the front outrigger 110, the foundation bearing capacity requirements and height of the supporting structure are determined. The calculation results are as follows: 4m (length) * 1.5m (width) * 0.4m (height) C30 concrete blocks are poured on both sides of the front cap beam 300 along its length to serve as the base 410. Four 3-layer 321 type Bailey bridges are arranged on the base 410. The Bailey bridge layers are connected by bolted reinforcing chords. The Bailey bridges are longitudinally connected to the cap beam 300 for stability via steel tie rods. Longitudinal I-beams are arranged on the top surface of the Bailey bridges as distribution beams 430. Because the front outrigger 110 is heightened, calculations show that the middle outrigger 120 needs to use four 1.0m (length) * 1.0m (width) * 1.2m (height) concrete blocks to adjust the height of the bridge erecting machine 100, ensuring that the top surface of the longitudinal beam of the bridge erecting machine 100 meets the travel requirements of the overhead crane 130, thereby successfully completing the installation of the ultra-large longitudinal slope box girder 200.

[0049] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A support structure for a bridge erecting machine, the bridge erecting machine (100) comprising a front support leg (110) and a middle support leg (120), characterized in that, The bridge erecting machine support structure includes: A front outrigger support (400) is disposed on the ground and located at the bottom of the front outrigger (110). The front outrigger support (400) includes a base (410), a support body (420), and a distribution beam (430) stacked in sequence along the vertical direction. The side of the base (410) facing away from the support body (420) is in contact with the ground, and the side of the distribution beam (430) facing away from the support body (420) is in contact with the bottom of the front outrigger (110). The middle support leg (500) is mounted on the installed box girder (200) and located at the bottom of the middle support leg (120).

2. The bridge erecting machine support structure according to claim 1, characterized in that, The supporting body (420) includes multiple support frames (421) erected sequentially along the vertical direction.

3. The bridge erecting machine support structure according to claim 2, characterized in that, The adjacent support frames (421) are detachably connected.

4. The bridge erecting machine support structure according to claim 3, characterized in that, The front support leg (400) and the cap beam (300) are arranged adjacent to each other in the longitudinal direction. The support frame (421) and the adjacent cap beam (300) are connected by a tie rod. The longitudinal direction is the length direction of the box girder (200).

5. The bridge erecting machine support structure according to any one of claims 1-4, characterized in that, The supporting body (420) is a liftable structure.

6. The bridge erecting machine support structure according to any one of claims 1-4, characterized in that, The distribution beam (430) includes a plurality of distribution members (431) arranged sequentially in the horizontal direction. The top of the distribution member (431) contacts the bottom of the front support leg (110), and the bottom of the distribution member (431) contacts the top of the support body (420).

7. The bridge erecting machine support structure according to claim 6, characterized in that, The distribution component (431) includes a first support part (4311), a vertical support part (4312), and a second support part (4313) connected in sequence. The first support part (4311) and the second support part (4313) are arranged horizontally. The two ends of the vertical support part (4312) are vertically connected to the first support part (4311) and the second support part (4313) respectively. The side of the first support part (4311) facing away from the vertical support part (4312) contacts the bottom of the front support leg (110). The side of the second support part (4313) facing away from the vertical support part (4312) contacts the top of the support body (420).

8. The bridge erecting machine support structure according to any one of claims 1-4, characterized in that, The base (410) includes a concrete pad.

9. The bridge erecting machine support structure according to claim 8, characterized in that, The number of concrete pads is multiple, and the multiple concrete pads are spaced apart along the length direction of the front support leg (110).

10. The bridge erecting machine support structure according to any one of claims 1-4, characterized in that, The central support leg (500) includes a concrete pad.

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