An adjustable external hanging cantilever support system and an adjustment method for an external hanging cantilever support

Abstract

The present application provides an adjustable external hanging cantilever support system and an adjustment method for an external hanging cantilever support. The adjustable external hanging cantilever support system includes a mounting base and a cantilever support; the mounting base is fixed on the side surface of a corresponding steel-concrete composite beam or steel box girder, and a plurality of first through holes are arranged on the mounting base; for the cantilever support, a second through hole is provided on the cantilever support, and different first through holes are coaxially selected to be coaxial with the second through hole to adjust the installation height of the cantilever support on the corresponding steel-concrete composite beam or steel box girder; a connecting piece passes through the coaxial first through hole and second through hole to connect the mounting base and the cantilever support to fix the installation height of the cantilever support on the corresponding steel-concrete composite beam or steel box girder. The adjustable external hanging cantilever support system of the present invention can select the installation height during the high-altitude installation of the cantilever support, so as to realize the adjustable height of the bamboo plywood bottom form, and at the same time can reduce the construction workload of high-altitude operations and reduce the working hours of high-altitude operations.

Description

Technical Field

[0001] The present application relates to the technical field of steel box girders, and particularly relates to an adjustable external hanging cantilever support system and an adjustment method for an external hanging cantilever support. Background Art

[0002] In recent years, steel-concrete composite girders and steel box girders have been increasingly widely used in urban interchange bridges and building structures in China. The application practice of steel-concrete composite girders and steel box girders shows that they have significant technical and economic benefits and social benefits, and are one of the main development directions of future structural systems.

[0003] Affected by design requirements and engineering practice, whether it is a steel-concrete composite girder or a steel box girder, after erection and installation are completed, there are processes of widening the beam top plate towards the air side and constructing a crash barrier on the widened part. In the prior art, usually on the ground, ear plates are welded on the side of the steel-concrete composite girder or the steel box girder, and then after the corresponding steel-concrete composite girder or steel box girder is hoisted and installed, the cantilever support is bolted to the ear plates, a bottom wooden square is laid on the cantilever support, and then a wooden square support and a bamboo plywood bottom form are arranged on the bottom wooden square. The bamboo plywood bottom form forms a mold for concrete pouring, and concrete is poured on the bamboo plywood bottom form to realize the widening of the beam top plate.

[0004] However, the above-mentioned method for widening the beam top plate in the prior art has the following problems: The position accuracy requirement for the bamboo plywood bottom form is relatively high, that is, the welding accuracy requirement for the ear plates is relatively high. In addition, there are differences in the required heights of the bamboo plywood bottom forms in each section of the steel-concrete composite girder or the steel box girder. And after the ear plates are welded, the position of the cantilever support is determined (that is, the position of the bamboo plywood bottom form is determined), and it is difficult to adjust the position of the cantilever support in the air after the steel-concrete composite girder or the steel box girder is hoisted and installed. That is, the applicability of the method for widening the beam top plate in the prior art is relatively poor, and the requirement for construction accuracy is relatively high. An improved technical solution for the above-mentioned deficiencies in the prior art needs to be provided. Summary of the Invention

[0005] The purpose of the present application is to provide an adjustable external hanging cantilever support system and an adjustment method for an external hanging cantilever support to solve or alleviate the problems existing in the above-mentioned prior art.

[0006] To achieve the above purpose, the present application provides the following technical solution: An adjustable external hanging cantilever support system for the cantilever installation of a steel-concrete composite girder or a steel box girder; comprising an installation foundation and a cantilever support;

[0007] The installation foundation is fixed on the side of the corresponding steel-concrete composite girder or steel box girder, and a plurality of first through holes are arranged on the installation foundation;

[0008] The cantilever bracket is provided with a second through hole. Different first through holes are coaxially selected to be coaxial with the second through hole to adjust the installation height of the cantilever bracket on the corresponding steel-concrete composite beam or steel box girder.

[0009] The connecting piece passes through the coaxial first through hole and second through hole to connect the installation base and the cantilever bracket, so as to fix the installation height of the cantilever bracket on the corresponding steel-concrete composite beam or steel box girder.

[0010] Furthermore, the installation base includes a vertical plate. The extending direction of the vertical plate is perpendicular to the extending direction of the corresponding steel-concrete composite beam or steel box girder, and the first through holes are arranged on the vertical plate.

[0011] Furthermore, the installation base further includes a horizontal plate. The extending direction of the horizontal plate is parallel to the extending direction of the corresponding steel-concrete composite beam or steel box girder. The horizontal plate is welded to the side surface of the corresponding steel-concrete composite beam or steel box girder, and the vertical plate is welded to the horizontal plate.

[0012] Furthermore, the vertical plate is welded to the side surface of the corresponding steel-concrete composite beam or steel box girder.

[0013] Furthermore, the cantilever bracket is triangular. One of its sides is formed by an installation plate, and the second through hole is arranged on the installation plate.

[0014] Furthermore, two vertical plates are correspondingly provided for one cantilever bracket. The thickness of the installation plate matches the interval between the two vertical plates, and the installation plate is inserted between the two vertical plates.

[0015] Furthermore, two horizontal plates are arranged in parallel, and the vertical plate is arranged between the two horizontal plates.

[0016] Furthermore, the width of the installation plate is equal to the width of the horizontal plate. Herein, the width of the horizontal plate is the width of the surface where the horizontal plate is welded to the vertical plate.

[0017] The present invention also provides an adjustment method for the external cantilever bracket. The adjustable external cantilever bracket system is used for cantilever installation of the steel-concrete composite beam or steel box girder, including the following steps:

[0018] Step S101: When the corresponding single-section steel-concrete composite beam or steel box girder is placed on the ground, weld the installation base on the side surface of the beam.

[0019] Step S201: Complete the erection of the corresponding single-section steel-concrete composite beam or steel box girder.

[0020] Step S301: Determine the required height of the cantilever bracket; select the first through hole to overlap with the second through hole, and install bolts in the second through hole and the selected first through hole to realize the bolt connection between the cantilever bracket and the installation base.

[0021] Further, in step S101, first weld the horizontal plate and the vertical plate, then weld the horizontal plate to the side surface of the single-section steel-concrete composite beam or steel box girder, and finally weld the vertical plate to the side surface of the single-section steel-concrete composite beam or steel box girder.

[0022] Beneficial effects

[0023] 1) The adjustable external hanging cantilever support system of the present invention can have an optional installation height during the high-altitude installation of the cantilever support, thereby realizing the adjustable height of the bamboo plywood bottom form, solving the problem that the height is not adjustable during the installation of the cantilever support and only being able to control the height of the bamboo plywood bottom form by padding with other materials, resulting in potential hidden dangers in the project quality. At the same time, it can reduce the construction workload of high-altitude operations and reduce the working hours of high-altitude operations.

[0024] 2) The adjustment method of the external hanging cantilever support of the present invention can do a lot of work on the ground and only needs to adjust the position of the cantilever support and bolt it during high-altitude operations, which can reduce the construction workload of high-altitude operations and reduce the working hours of high-altitude operations. Description of the drawings

[0025] The specification drawings forming a part of this application are used to provide a further understanding of this application. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation to this application. Among them:

[0026] Figure 1 is the installation schematic diagram of the fixed foundation of a specific embodiment of the adjustable external hanging cantilever support system of the present invention;

[0027] Figure 2 is the structural schematic diagram of the cantilever support of a specific embodiment of the adjustable external hanging cantilever support system;

[0028] Figure 3 is the program block diagram of a specific embodiment of the adjustment method of the external hanging cantilever support.

[0029] Description of the reference numerals:

[0030] 1 - steel-concrete composite beam; 11 - side surface of the beam; 2 - horizontal plate; 3 - vertical plate; 31 - first through hole; 4 - cantilever support; 41 - mounting plate; 411 - second through hole. Detailed implementation manners

[0031] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present application rather than a limitation of the present application. In fact, those skilled in the art will appreciate that modifications and variations can be made to the present application without departing from the scope or spirit thereof. For example, features shown or described as part of one embodiment can be used in another embodiment to yield yet another embodiment. Accordingly, it is intended that the present application cover such modifications and variations that fall within the scope of the appended claims and their equivalents.

[0032] In the description of the present application, the orientation or positional relationship indicated by terms such as "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application rather than requiring the present application to be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present application. The terms "connected", "connected to", and "arranged" used in the present application should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be directly connected or indirectly connected through an intermediate member; for those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0033] The present invention provides a specific embodiment of an adjustable external hanging cantilever support system, as Figures 1 to 2 shown, an adjustable external hanging cantilever support system includes a mounting base and a cantilever support 4.

[0034] The mounting base includes two horizontal plates 2 and a vertical plate 3. The two horizontal plates 2 are arranged in parallel and are welded to the side surface 11 of the corresponding steel-concrete composite beam 1 or steel box girder (in this embodiment, the steel-concrete composite beam 1 is taken as an example and described in conjunction with the drawings). In the same engineering section, the intervals between the two parallel horizontal plates 2 are usually equal. The purpose of arranging the horizontal plates 2 in parallel is to only require one type of vertical plate 3 to be configured. The length of the horizontal plate 2 matches the length of the corresponding single-section steel-concrete composite beam 1. When the vertical plate 3 needs to be installed at the edge of the steel-concrete composite beam 1, it is avoided that when the horizontal plate 2 does not extend to the edge of the steel-concrete composite beam 1, the vertical plate 3 at the edge of the steel-concrete composite beam 1 cannot be connected to the horizontal plate 2, thereby ensuring the reliable fixation of the vertical plate 3 at the edge of the steel-concrete composite beam 1. The extending direction of the horizontal plate 2 is parallel to the extending direction of the corresponding steel-concrete composite beam 1, so that on the premise that each cantilever support 4 can be arranged along the extending direction of the corresponding steel-concrete composite beam 1, it is not necessary to set multiple specifications of cantilever supports 4, and the manufacturing work of the cantilever supports 4 is relatively simple.

[0035] The vertical plate 3 is arranged between two horizontal plates 2. The extending direction of the vertical plate 3 is perpendicular to the extending direction of the corresponding steel-concrete composite beam 1, so as to form an upward support for the bottom wooden square. The vertical plate 3 is welded to the horizontal plate 2, and there is also a welding relationship between the vertical plate 3 and the beam side surface 11 of the corresponding steel-concrete composite beam 1 to ensure the reliable fixation of the vertical plate 3. The number of vertical plates 3 provided for each section of the steel-concrete composite beam 1 is obtained according to the number of cantilever supports 4 in the construction standard, that is, two vertical plates 3 are provided for one cantilever support 4. In this embodiment, the number of cantilever supports 4 is calculated according to the following construction regulations: the adjacent cantilever supports 4 are arranged at an interval of one meter.

[0036] On the basis of welding the vertical plate 3 to the beam side surface 11, by arranging the horizontal plate 2 and welding the horizontal plate 2 to the vertical plate 3 and the beam side surface 11 respectively, the connection relationship between the vertical plate 3 and the beam side surface 11 is increased. The number of horizontal plates 2 is two, which can further increase the connection relationship between the vertical plate 3 and the beam side surface 11. Increasing the connection relationship between the vertical plate 3 and the beam side surface 11 can further ensure the reliable fixation of the cantilever support 4. Five first through holes 31 are evenly distributed along the extending direction on the vertical plate 3.

[0037] The cantilever support 4 is triangular. One side is formed by the mounting plate 41, and the other two sides of the cantilever support 4 are respectively formed by channel steels. The mounting plate 41 and the channel steels are welded to form the cantilever support 4. During use, the end of the channel steel at the top away from the mounting plate 41 overhangs. The overhanging length is not longer than one-fifth of the length of the channel steel at the top during use. Compared with the non-overhanging scheme, it not only meets the required length of the channel steel at the top during use, but also saves the material of another channel steel. In particular, the support point of the other channel steel for the channel steel at the top is relatively close to the midpoint of the channel steel at the top. On the premise of ensuring that the overhanging part will not be damaged during use, the risk of damage to the middle part of the channel steel at the top during use can be reduced.

[0038] The width of the mounting plate 41 is equal to the width of the horizontal plate 2. Here, the width of the horizontal plate 2 is the width of the surface where the horizontal plate 2 is welded to the vertical plate 3. The equal width of the mounting plate 41 and the horizontal plate 2 can avoid the influence of the mounting plate 41 on the laying of the bottom wooden square. The mounting plate 41 is provided with second through holes 411. In this embodiment, according to the use requirements, the number of the second through holes 411 on the mounting plate 41 is three, and it can meet the requirements by bolting to the installation foundation with three bolts. The three bolts together form a connecting piece. In other embodiments, the number of the mounting plates 41 can be adjusted according to the actual construction requirements, and can be two, four, etc. The vertical plate 3 and the cantilever bracket 4 are bolted through bolts passing through the first through hole 31 and the second through hole 411. Specifically, one cantilever bracket 4 corresponds to two vertical plates 3. The thickness of the mounting plate 41 matches the interval between the two vertical plates 3. The mounting plate 41 is inserted between the two vertical plates 3, then the first through hole 31 and the second through hole 411 are aligned and the height of the cantilever bracket 4 reaches the construction preset position, and then bolted. The bolts used for bolting are selected as φ24 high-strength bolts according to the construction requirements. In other embodiments, bolts of other specifications can be selected according to the construction requirements. By bolting the two vertical plates 3 and the cantilever bracket 4, the force on the vertical plate 3 is balanced, and the fixing reliability of the cantilever bracket 4 is better ensured.

[0039] The number of the first through holes 31 on the vertical plate 3 is greater than the number of the second through holes 411 on the mounting plate 41. In this embodiment, the number of the first through holes 31 is five, and the number of the second through holes 411 is three. The number of the first through holes 31 is two more than the number of the second through holes 411, that is, the cantilever bracket 4 has three optional positions, upper, middle and lower, on the installation foundation. The reason for only setting three optional positions in this embodiment is that the adjustment requirement range of the height of the cantilever bracket 4 in this embodiment is small. In other embodiments, according to the adjustment requirement range of the height of the cantilever bracket 4, the number of the first through holes 31 can be set to be one, three, etc. more than the number of the second through holes 411. When the number of the first through holes 31 is one more than the number of the second through holes 411, the cantilever bracket 4 has two installation positions to choose from. When the number of the first through holes 31 is three more than the number of the second through holes 411, the cantilever bracket 4 has four installation positions to choose from, and so on.

[0040] In this embodiment, the mounting plate 41, the horizontal plate 2, the vertical plate 3 and the channel steel are all made of [100 channel steel. The relevant parameters of the [100 channel steel: f = 205.0 MPa; E = 2.1×105 MPa; A = 1274.8 mm 2 ; Ix = 19.8×105 mm 4 ; Iy = 2.56×105 mm 4 ; Wx = 39.7×103 mm 3 ; ix = 39.5 mm; iy = 14.1 mm.

[0041] The present invention also provides a specific embodiment of an adjustment method for an external hanging cantilever support. This method is implemented by adopting the above adjustable external hanging cantilever support system. As Figure 3 shown, it includes the following steps:

[0042] Step S101, when the corresponding single-section steel-concrete composite beam 1 or steel box girder is placed on the ground, install a foundation by welding on the side surface 11 of the beam. Specifically, first weld two cross plates 2 with the corresponding number of vertical plates 3, then weld the cross plates 2 on the side surface 11 of the single-section steel-concrete composite beam 1 or steel box girder, and finally weld the vertical plates 3 to the side surface 11 of the single-section steel-concrete composite beam 1 or steel box girder. By setting the cross plates 2, the number of cross plates 2 to be two, and welding the vertical plates 3 to the side surface 11 and the cross plates 2 respectively, the fixing reliability of the cantilever support 4 can be further ensured.

[0043] Step S201, complete the erection of the corresponding single-section steel-concrete composite beam 1 or steel box girder;

[0044] Step S301, determine the height of the bamboo plywood bottom form according to the design requirements, and determine the required height of the cantilever support 4 according to the heights of the bamboo plywood bottom form, the bottom wooden square, and the wooden square support.

[0045] Step S401, according to the determined required height of the cantilever support 4, select the first through hole 31 corresponding to the second through hole 411, insert the mounting plate 41 between the two vertical plates 3, and adjust the cantilever support 4 along the extending direction of the vertical plates 3 to the preset height. Install bolts in the second through hole 411 and the selected first through hole 31 to achieve bolt connection between the cantilever support 4 and the installation foundation, and complete the installation of the cantilever support 4.

[0046] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. An adjustable external cantilever support system for the cantilever installation of steel-concrete composite beams or steel box girders; characterized in that, It includes an installation base and a cantilever bracket; The installation base is fixed on the side of the corresponding steel-concrete composite beam or steel box girder. A plurality of first through holes are arranged on the installation base; A cantilever bracket, on which a second through hole is provided. Different first through holes are coaxially selected to be coaxial with the second through hole to adjust the installation height of the cantilever bracket on the corresponding steel-concrete composite beam or steel box girder; A connecting piece passes through the coaxial first through hole and second through hole to connect the installation base and the cantilever bracket to fix the installation height of the cantilever bracket on the corresponding steel-concrete composite beam or steel box girder; The installation base includes a vertical plate. The extending direction of the vertical plate is perpendicular to the extending direction of the corresponding steel-concrete composite beam or steel box girder. The first through holes are arranged on the vertical plate; The installation base further includes a horizontal plate. The extending direction of the horizontal plate is parallel to the extending direction of the corresponding steel-concrete composite beam or steel box girder. The horizontal plate is welded to the side of the corresponding steel-concrete composite beam or steel box girder. The vertical plate is welded to the horizontal plate; The vertical plate is welded to the side of the corresponding steel-concrete composite beam or steel box girder; The cantilever bracket is triangular. One of its sides is formed by a mounting plate. The second through hole is provided on the mounting plate; One cantilever bracket is correspondingly provided with two vertical plates. The thickness of the mounting plate matches the interval between the two vertical plates. The mounting plate is inserted between the two vertical plates; Two horizontal plates are arranged in parallel. The vertical plate is arranged between the two horizontal plates.

2. An adjustable external hanging cantilever support system according to claim 1, characterized in that, The width of the mounting plate is equal to the width of the horizontal plate. Among them, the width of the horizontal plate is the width of the surface where the horizontal plate is welded to the vertical plate.

3. Adjustment method for the external hanging cantilever bracket, characterized in that, When using the adjustable external hanging cantilever bracket system according to any one of claims 1-2 for cantilever installation of a steel-concrete composite beam or a steel box girder, the following steps are included: Step S101, when the corresponding single-section steel-concrete composite beam or steel box girder is placed on the ground, weld the installation base on the side of the beam; Step S201, complete the erection of the corresponding single-section steel-concrete composite beam or steel box girder; Step S301, determine the required height of the cantilever bracket according to; select the first through hole to overlap with the second through hole, and install bolts in the second through hole and the selected first through hole to realize the bolt connection between the cantilever bracket and the installation base.

4. The adjustment method of the external hanging cantilever bracket according to claim 3, characterized in that, Step S101, first weld the horizontal plate and the vertical plate, then weld the horizontal plate to the side of the single-section steel-concrete composite beam or steel box girder, and finally weld the vertical plate to the side of the single-section steel-concrete composite beam or steel box girder.

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