Anti-overturning box type roadbed structure

Abstract

The invention provides an anti-overturning box-type roadbed structure which comprises a box-type roadbed and a composite foundation, the composite foundation is buried in the ground, the box-type roadbed is arranged on the composite foundation, and the top of the box-type roadbed is used for bearing a track structure; supporting ribs are arranged on the two sides of the box-type roadbed in the width direction, the ground of the supporting ribs is attached to the composite foundation, a transverse partition plate and a vertical partition plate are arranged in a cavity of the box-type roadbed, and the transverse partition plate, the vertical partition plate and a top plate of the box-type roadbed form two upper cavities which are used for arranging accessory equipment along a railway. The box-type roadbed structure provided by the invention has the following advantages that through simple arrangement, the anti-overturning capability of the box-type roadbed structure is remarkably improved, so that the box-type roadbed structure can adapt to more complicated geological conditions and external loads. Through the innovative structural design, the rigidity of the box-type roadbed structure and the rigidity of the foundation are guaranteed, the stability and safety of the railway roadbed are remarkably improved, meanwhile, the maintenance and repair cost caused by overturning and twisting is reduced, important practical value and market application prospects are achieved, and application and popularization of the box-type roadbed are facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of roadbed construction, and in particular to an anti-overturning box-type roadbed structure. Background Art

[0002] In the engineering practice of high-speed railways, Chinese engineers have proposed a new type of roadbed structure concept, namely the box-type roadbed, which is mainly a reinforced concrete structure formed by a top plate, a bottom plate and a side plate. The box-type roadbed uses a reinforced concrete structure to replace the traditional loose gravel and soil fillers. Compared with the traditional high-fill roadbed, the box-type roadbed has not only been significantly improved in strength and stability, but also has better torsional rigidity and integrity. However, my country's terrain is undulating and the height of the railway roadbed is variable. With the increase of the height-to-width ratio of the box-type roadbed, the anti-overturning ability of the box-type roadbed decreases. When facing adverse horizontal loads such as centrifugal force, lateral wind load, and lateral sway force, there is a risk of overall overturning.

[0003] At present, there is no research and patent for improving the anti-overturning ability of box-type roadbed. Therefore, it is urgent to design a new anti-overturning box-type roadbed structure, which can significantly improve the stability and safety of the railway roadbed and reduce the maintenance cost. It has important practical value and market application prospects, and is conducive to the promotion and application of box-type roadbed. Summary of the invention

[0004] An embodiment of the present invention provides an anti-overturning box-type roadbed structure, which is used to solve the problems existing in the prior art.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme.

[0006] A box-type roadbed structure that resists overturning comprises a box-type roadbed, wherein the box-type roadbed is arranged on a composite foundation, and the composite foundation is buried in the ground; the top of the box-type roadbed is used to bear a track structure; ribs are arranged on both sides of the box-type roadbed in a width direction, and the ground of the ribs is attached to the composite foundation; and an equipment chamber is arranged in the cavity of the box-type roadbed.

[0007] Preferably, the cavity of the box-type roadbed is provided with a transverse partition and a vertical partition; the transverse partition and the vertical partition are arranged in an inverted T shape with respect to each other, and together construct two equipment chambers in the cavity of the box-type roadbed.

[0008] Preferably, the height of the vertical partition is 1 m.

[0009] Preferably, the ribs are arranged at intervals along the length direction of the box-type roadbed; the spacing distance between adjacent ribs is determined by the height-to-span ratio h0 / L of the box-type roadbed and the rib thickness c.

[0010] Preferably, the pile arrangement width of the composite foundation satisfies the formula

[0011] d0>(d x +2a) (1);

[0012] Where d0 is the layout width of composite foundation piles, d x is the width of the box roadbed.

[0013] Preferably, the maximum width of the rib is obtained by the formula

[0014]

[0015] Calculated; In formula (6), K is the anti-overturning coefficient of the box-type roadbed structure, which is obtained by formula

[0016]

[0017] Calculated, G is the deadweight of the box roadbed and track structure, P c Centrifugal force, P h is the lateral sway force, e is the anti-overturning moment, and e=d x / 2,P w is the wind load, A is the location of the overturning axis of the box-type roadbed, and satisfies B satisfies B=P c ·(h 轨 +△h)+P h ·h 轨 , where h 轨 is the rail height.

[0018] Preferably, the cross section of the rib is fan-shaped, and the height of the rib is determined by the formula

[0019]

[0020] Obtained by calculation.

[0021] Preferably, the box-type roadbed and the supporting ribs are integrally formed.

[0022] It can be seen from the technical solutions provided by the above embodiments of the present invention that the present invention provides an anti-overturning box-type roadbed structure, including a box-type roadbed and a composite foundation, the composite foundation is buried in the ground, the box-type roadbed is arranged on the composite foundation, and the top is used to bear the track structure; ribs are arranged on both sides of the width direction of the box-type roadbed, and the ground of the ribs is attached to the composite foundation. The box-type roadbed structure provided by the present invention has the following advantages:

[0023] (1) The present invention makes full use of the cavity space of the box-type roadbed by setting the partitions for setting up auxiliary equipment along the railway; at the same time, the setting of the vertical partitions helps to reduce the deformation of the middle part of the top plate of the box-type roadbed and improve the overall rigidity of the box-type roadbed;

[0024] (2) The present invention significantly improves its anti-overturning ability through simple settings to adapt to more complex geological conditions and external loads. Through innovative structural design, the foundation stiffness is guaranteed, the stability and safety of the railway roadbed are significantly improved, and the maintenance and repair costs caused by overturning and torsion are reduced. It has important practical value and market application prospects, and is conducive to the promotion and application of box-type roadbeds;

[0025] (3) The present invention comprehensively considers the anti-overturning capacity and the floor area of ​​the box-type roadbed, determines the value range of the bottom width a of the rib, and simultaneously considers stress diffusion and avoiding stress concentration, and sets the rib cross-section to a sector of the arc edge.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description, which will become obvious from the following description, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0028] Figure 1 A front view of an anti-overturning roadbed structure provided by the present invention;

[0029] Figure 2 A top view of an anti-overturning roadbed structure provided by the present invention;

[0030] Figure 3 A side view of an anti-overturning roadbed structure provided by the present invention;

[0031] Figure 4 Three views of a rib of an anti-overturning roadbed structure provided by the present invention;

[0032] Figure 5 A force analysis diagram of the width of the rib of the anti-overturning roadbed structure provided by the present invention is determined based on the anti-overturning calculation of the structure;

[0033] Figure 6 A three-dimensional model diagram of an anti-overturning roadbed structure provided by the present invention.

[0034] In the figure:

[0035] 1. Track structure 2. Box roadbed 3. Composite foundation 4. Support ribs 5. Vertical partitions 6. Horizontal partitions. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0037] It will be understood by those skilled in the art that, unless expressly stated, the singular forms "one", "said", and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" or "coupled" to another element, it may be directly connected or coupled to the other element, or there may be intermediate elements. In addition, the "connection" or "coupling" used herein may include wireless connection or coupling. The term "and / or" used herein includes any unit and all combinations of one or more associated listed items.

[0038] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0039] To facilitate understanding of the embodiments of the present invention, several specific embodiments will be further explained below with reference to the accompanying drawings, and each embodiment does not constitute a limitation on the embodiments of the present invention.

[0040] See also Figures 1 to 3 The present invention provides an anti-overturning box-type roadbed structure, including a box-type roadbed. The box-type roadbed is arranged on an external composite foundation. The composite foundation is buried in the ground. The top of the box-type roadbed is used to support the track structure. Ribs are arranged on both sides of the box-type roadbed in the width direction, and the ground of the ribs is attached to the composite foundation.

[0041] Taking into account the high torsional rigidity and good integrity of the box-type roadbed structure itself, multiple pairs of supporting ribs can be arranged at a certain distance to reduce the deadweight of the structure. The spacing distance is mainly determined by the height-to-span ratio h0 / L of the box-type roadbed.

[0042] In the embodiment provided by the present invention, the box-type roadbed has a hollow cavity inside, and the cavity is provided with an equipment chamber for setting up auxiliary equipment along the railway. Figure 1As shown, the equipment chamber is located in the upper area of ​​the cavity.

[0043] In some preferred embodiments, the equipment chamber is constructed by a transverse partition and a vertical partition arranged in the chamber. Figure 1 As shown, the transverse partition and the vertical partition are arranged in an inverted T shape, that is, a horizontal transverse partition is arranged in the middle of the cavity, and the vertical partition is vertically installed on the transverse partition to separate the cavity into two equipment chambers.

[0044] Considering that the height of the box-type roadbed cavity will vary greatly in areas with large terrain undulations, the transverse and vertical partitions are set above the box-type roadbed cavity, forming two cavities with the top plate for railway ancillary equipment. To ensure equipment installation and personnel operation, the height of the vertical partition is determined to be 1m.

[0045] See also Figure 1 and Figure 5 In order to ensure the foundation stiffness, the layout width d0 of the composite foundation piles should be greater than the bottom width of the box-type roadbed after the ribs are set on both sides, that is, it satisfies the following formula:

[0046] d0>(d x +2a) (1)

[0047] The bottom width of the buttress is determined through the anti-overturning calculation of the concrete structure. Referring to the "Code for Design of Foundations and Subgrades for Railway Bridges and Culverts", the overturning stability coefficient of the box-type roadbed should be calculated according to the following formula and should not be less than 1.5.

[0048]

[0049] Select the most unfavorable cross section, see Figure 5 When the foundation stiffness is large enough, point A is where the overturning axis is located, and the vertical force mainly considers the deadweight G of the box roadbed and track structure. The horizontal force mainly considers the wind load P w , centrifugal force P c and lateral rocking force P h , ignoring the effect of structure size on the above loads.

[0050] The calculation formula for the anti-overturning coefficient of the box-type roadbed structure is:

[0051]

[0052] Considering that the box-type roadbed is a highly symmetrical structure, the anti-overturning moment e = d x / 2,d x is the width of the box roadbed. Refer to the relevant specifications, centrifugal force P c The action point is Δh=1.8m above the rail top, and the lateral swing force P h The action point is located at the top of the rail, and the wind load P wDistributed on the side of the box roadbed in the form of uniform load, the overturning moment h1=h0+h 轨 +Δh,h2=h0+h 轨 , h3=h0 / 2, which is half of the box roadbed height. h1 is the box roadbed, track height and centrifugal force P c The sum of the three action heights. Substituting into formula (2) yields the following formula:

[0053]

[0054] In the above formula, B=P c ·(h 轨 +△h)+P h ·h 轨 , then the bottom width of the rib is:

[0055]

[0056] From the above formula (5), it can be seen that the minimum width of the bottom of the rib is mainly controlled by the height of the box roadbed. Considering the floor area, the maximum width of the bottom of the rib is controlled by the width of the top plate of the box roadbed, that is, the width of the bottom of the rib should not exceed the width of the top plate of the box roadbed, that is,

[0057] In summary, the range of the bottom width of the rib is:

[0058]

[0059] See also Figure 4 In order to avoid stress concentration, and considering the force characteristics and construction convenience, the rib cross section is preferably set to a fan-shaped with arc-shaped edges (and the outer side is an arc-shaped surface), then the rib height The specific value of the angle α of the inclined plane refers to the relevant research on the stress diffusion angle.

[0060] Considering the integrity of the components and the simple and single shape of the buttress, the construction adopts the method of integral casting, which can be cast on site or directly cast in the factory. During construction, the wall panel steel bars and buttress steel bars are first tied. After the steel bars are installed and inspected by the supervisor, the mold is poured. During construction, special attention should be paid to the verticality and flatness of the template. Pads are set between the reinforced concrete and the template. The pads are tied tightly with the steel bars. The pads should be made of fine stone concrete to ensure that the strength of the pads is the same as that of the concrete structure. The installation of the pads should ensure that the thickness of the protective layer of the steel bars meets the design requirements. During the concrete construction process, the position of the pads should be checked frequently to ensure that they are accurate, and strict quality control measures should be implemented. After the construction is completed, an anti-overturning performance test is carried out to verify the actual effect of the new box-type roadbed structure.

[0061] In summary, the present invention provides an anti-overturning box-type roadbed structure, comprising a box-type roadbed and a composite foundation, the composite foundation is buried in the ground, the box-type roadbed is arranged on the composite foundation, and the top is used to bear the track structure; ribs are arranged on both sides of the box-type roadbed in the width direction, and the ground of the ribs is attached to the composite foundation. The box-type roadbed structure provided by the present invention has the following advantages:

[0062] (1) The present invention makes full use of the cavity space of the box-type roadbed by setting up the partitions for setting up auxiliary equipment along the railway. At the same time, the setting of the vertical partitions helps to reduce the deformation of the middle part of the top plate of the box-type roadbed and improve the overall rigidity of the box-type roadbed.

[0063] (2) The present invention significantly improves its anti-overturning ability through simple settings to adapt to more complex geological conditions and external loads. Through innovative structural design, the foundation stiffness is guaranteed, the stability and safety of the railway roadbed are significantly improved, and the maintenance and repair costs caused by overturning and torsion are reduced. It has important practical value and market application prospects, and is conducive to the promotion and application of box-type roadbeds.

[0064] (4) The present invention comprehensively considers the anti-overturning capacity and the floor area of ​​the box-type roadbed, determines the value range of the bottom width a of the rib, and simultaneously considers stress diffusion and avoidance of stress concentration, and sets the rib cross-section to a fan-shaped with arc edges.

[0065] Those skilled in the art can understand that the accompanying drawings are only schematic diagrams of an embodiment, and the modules or processes in the accompanying drawings are not necessarily required to implement the present invention.

[0066] It can be known from the description of the above implementation methods that those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which can be stored in a storage medium such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in the various embodiments of the present invention or certain parts of the embodiments.

[0067] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. The device and system embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0068] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An anti-overturning box-type roadbed structure, characterized in that: It includes a box-type roadbed, which is arranged on a composite foundation, and the composite foundation is buried in the ground; the top of the box-type roadbed is used to support the track structure; ribs are arranged on both sides of the box-type roadbed in the width direction, and the ground of the ribs is attached to the composite foundation; and an equipment chamber is arranged in the cavity of the box-type roadbed.

2. The box-type roadbed structure according to claim 1, characterized in that: The cavity of the box-type roadbed is provided with a transverse partition and a vertical partition; the transverse partition and the vertical partition are arranged in an inverted T shape with each other, and together construct two equipment chambers in the cavity of the box-type roadbed.

3. The box-type roadbed structure according to claim 2, characterized in that: The height of the vertical partition is 1m.

4. The box-type roadbed structure according to claim 1, characterized in that: The ribs are arranged at intervals along the length direction of the box-type roadbed; the spacing distance between adjacent ribs is determined by the height-to-span ratio h0 / L of the box-type roadbed and the rib thickness c.

5. The box-type roadbed structure according to claim 4, characterized in that: The pile arrangement width of the composite foundation satisfies the formula d0>(d x +2a) (1); Where d0 is the layout width of composite foundation piles, d x is the width of the box roadbed.

6. The box-type roadbed structure according to claim 5, characterized in that: The maximum width of the rib is given by Calculated; In formula (6), K is the anti-overturning coefficient of the box-type roadbed structure, which is obtained by formula Calculated, G is the deadweight of the box-type roadbed and track structure, P c Centrifugal force, P h is the lateral sway force, e is the anti-overturning moment, and e=d x / 2,P w is the wind load, A is the location of the overturning axis of the box-type roadbed, and satisfies B satisfies B=P c ·(h 轨 +△h)+P h ·h 轨 , where h 轨 is the rail height.

7. The box-type roadbed structure according to claim 6, characterized in that: The cross section of the supporting rib is fan-shaped, and the height of the supporting rib is determined by the formula Obtained by calculation.

8. The box-type roadbed structure according to any one of claims 1 to 7, characterized in that: The box-type roadbed and the supporting ribs are integrally formed.

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