Beam column type space rigid frame bridge and design method thereof
By setting the longitudinal beam and the top of the beam on the same horizontal plane in the bridge design and setting inspection holes at the intersection, the existing large-span bridge structure has poor economic efficiency, high construction difficulty and vehicle climbing problems at the intersections of railways and highways, and the reduction of structural height and improvement of operational efficiency have been achieved.
Patent Information
- Application Number
- CN202411520726.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2025-03-11
AI Technical Summary
The existing large-span bridge structure has poor economic efficiency, difficult construction, and vehicle climbing problems at the intersections of railways and highways.
The beam-column-type space rigid structure bridge design is adopted. By setting the longitudinal beam and the top of the beam on the same horizontal plane, sharing the same height space, reducing the structural height, and setting inspection holes at the intersection of the beam and the longitudinal beam for inspection.
It effectively reduces the height of the bridge structure, avoids vehicle climbing, improves operational efficiency, and reduces engineering costs, while ensuring the safety and maintainability of the bridge.
Smart Images
Figure CN119593285A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of bridges, and in particular to a beam-column type spatial rigid frame bridge and a design method thereof. Background Art
[0002] At present, when railways, highways intersect other railways, highways or rivers at a small angle, in order to achieve the crossing, the existing technology usually adopts large-span bridge structures, frame piers, steel cross beams and other structural forms, but these structures generally have problems such as poor economy and great construction difficulty. Summary of the invention
[0003] The purpose of the present invention is to provide a beam-column type space rigid frame bridge and a design method thereof to improve the above problems. In order to achieve the above purpose, the technical solution adopted by the present invention is as follows:
[0004] On the one hand, the present application provides a beam-column type spatial rigid frame bridge, including: a foundation, piers, a cross beam and a longitudinal beam, wherein the foundation is arranged on the ground, and the foundation is arranged perpendicular to the ground; the piers are arranged at the top of the foundation, and a spacing is arranged between two adjacent piers; the cross beam is arranged at the top of the piers; the longitudinal beam is arranged between two adjacent cross beams, and the longitudinal beam and the top of the cross beam are arranged on the same horizontal plane.
[0005] On the other hand, the present application provides a beam-column type spatial rigid frame bridge design method, the method comprising:
[0006] Acquire first information, wherein the first information includes normal stress data at various heights on a cross section of the beam;
[0007] Analyze the stress condition of the beam according to the first information to obtain second information;
[0008] Determine the location of the center of the inspection hole according to the second information to obtain third information;
[0009] An inspection hole is set according to the third information.
[0010] The beneficial effects of the present invention are:
[0011] The present invention arranges the tops of the longitudinal beam and the cross beam on the same horizontal plane so that the cross beam and the longitudinal beam share the same height space, thereby effectively reducing the structural height, avoiding the vehicle climbing due to the line elevation, and improving the operation efficiency.
[0012] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or be understood by implementing the embodiments of the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.
[0014] Figure 1 It is an elevation view of the beam-column type spatial rigid frame bridge described in an embodiment of the present invention.
[0015] Figure 2 It is a cross-sectional view of the beam-column type spatial rigid frame bridge described in an embodiment of the present invention.
[0016] Figure 3 This is a diagram showing the stress state of the crossbeam after the inspection hole is opened in the embodiment of the present invention.
[0017] Markings in the figure: 1. Foundation; 2. Pier; 3. Longitudinal beam; 4. Horizontal beam; 5. Inspection hole; 6. Ground line. DETAILED DESCRIPTION
[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.
[0019] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. At the same time, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.
[0020] Example 1
[0021] like Figure 1 As shown, this embodiment provides a beam-column type space rigid frame bridge, including: a foundation 1, a pier 2, a cross beam 4 and a longitudinal beam 3. The foundation 1 is arranged on the ground, and the foundation 1 is arranged vertically to the ground; the pier 2 is arranged on the top of the foundation 1, and a spacing is arranged between two adjacent piers 2; the cross beam 4 is arranged on the top of the pier 2; the longitudinal beam 3 is arranged between two adjacent cross beams 4, and the tops of the longitudinal beam 3 and the cross beam 4 are arranged on the same horizontal plane. At present, when railways, highways intersect with other railways, highways or rivers at a small angle (generally less than 30 degrees), in order to achieve crossing, large-span bridge structures, frame piers, and steel cross beams are often used. When a large-span bridge structure is used, the large-span bridge has complex force, a long construction time, a high safety risk, and poor economy; when a frame pier is used for crossing, Due to the large height of the frame pier cross beam, the clearance under the bridge is compressed or the position of the upper bridge needs to be raised, resulting in vehicle climbing, reduced efficiency and increased engineering costs; when a steel cross beam is used, a steel-concrete transition section needs to be set, the force is relatively complex, and the steel beam needs to be regularly painted and maintained, which causes certain interference to the driving under the bridge. In addition, the cost of steel cross beams is relatively high. Therefore, the present invention sets the top of the longitudinal beam 3 and the cross beam 4 on the same horizontal plane, so that the cross beam 3 and the longitudinal beam 4 share the same height space, effectively reducing the structural height, avoiding the problem of vehicle climbing caused by the line elevation, causing the vehicle to run unevenly, and improving the operating efficiency. At the same time, due to the reduction in the structural height, the engineering cost is also reduced. It should be noted that the distance between two adjacent piers 2 has a railway, road or river that is crossed. Figure 1 The mark 6 is the ground line.
[0022] like Figure 2 As shown, in a specific embodiment of the present disclosure, an inspection hole 5 is provided at the intersection of the cross beam 4 and the longitudinal beam 3. The longitudinal beam 3 is a hollow box-type structure. A concrete partition is provided at the intersection of the longitudinal beam 3 and the cross beam 4. The partition is provided with a longitudinal inspection hole 5 for inspection personnel to pass through, thereby realizing walking and maintenance from the hollow box room of the bridge (longitudinal beam 3). If this inspection hole 5 is not provided, when maintenance personnel walk to the bridge, they need to go to the bridge deck first, then avoid this section of the bridge, and then enter the hollow box room. When personnel go to the bridge deck, it will bring greater safety risks and hidden dangers to the operating railways and high-grade highways. The present invention can effectively avoid this problem by providing this inspection hole 5.
[0023] In a specific embodiment of the present disclosure, the center of the inspection hole 5 coincides with the center of the beam 4, and the height of the inspection hole 5 is no more than one third of the height of the beam 4. In the present invention, since the inspection hole 5 is located at the intersection of the longitudinal beam 3 and the beam 4, which is a key position for force transmission, it is necessary to set the position of the inspection hole according to the force characteristics of the beam. According to the distribution of the positive stress on the beam 3, it can be known that the concrete at the upper and lower edges of the beam 3 is subjected to greater tensile and compressive stresses, and the central position of the beam 3 is subjected to less force, and the stress at the center of the beam 3 is zero. Therefore, the center of the inspection hole 5 is set at the center of the beam 4, and the height of the inspection hole 5 is no more than one third of the height of the beam 4. At this time, most of the concrete structure of the beam is retained and the weakening of the structure is minimized.
[0024] In a specific embodiment of the present disclosure, the height of the bottom surface of the longitudinal beam 3 is greater than the height of the bottom surface of the cross beam 4. The steel bars on the bottom surface of the longitudinal beam 3 and the steel bars on the bottom surface of the cross beam 4 are staggered in height to avoid crossing and position conflict of the steel bars of the two, thereby facilitating construction.
[0025] In a specific embodiment of the present disclosure, the diameter of the inspection hole 5 is greater than 0.8m, and the diameter of the inspection hole should not be less than 0.8m, so as to facilitate the inspection personnel of average size to pass through. It should be noted that the inspection hole is opened as a round hole, which can effectively avoid stress concentration and cracking risks.
[0026] Example 2
[0027] This embodiment provides a beam-column type spatial rigid frame bridge design method, the method comprising:
[0028] Step S1, obtaining first information, wherein the first information includes normal stress data at various heights on a cross section of the beam;
[0029] The step S1 includes step S11, step S12 and step S13, which specifically include:
[0030] Step S11, obtaining the moment of inertia of the cross section of the beam, the bending moment borne by the beam, and the position information of the location where the stress is to be calculated;
[0031] Step S12, calculating the height distance from the position information of the location where the stress is to be calculated to the center of the beam to obtain a first calculation result;
[0032] Step S13, performing calculation according to the first calculation result, the moment of inertia of the cross-section of the beam, and the bending moment borne by the beam, to obtain normal stress data corresponding to the stress to be calculated.
[0033] In this step, the specific calculation process of normal stress data is:
[0034]
[0035] In the above formula, σ is the normal stress data corresponding to the stress to be calculated, M is the bending moment borne by the beam, I is the moment of inertia of the beam section, and y is the first calculation result. According to the above formula, the normal stress data at any height of the beam section can be calculated.
[0036] Step S2, analyzing the stress condition of the beam according to the first information to obtain second information;
[0037] In this step, the stress state diagram of the crossbeam 4 after the inspection hole 5 is opened can be drawn according to the first information, such as Figure 3 As shown, through Figure 3 It can be seen that the concrete at the upper and lower edges of the beam 4 is subjected to greater tensile and compressive stresses, the central position of the beam 4 is subjected to less stress, and the stress at the center of the beam 4 is zero.
[0038] Step S3, determining the setting position of the center of the inspection hole according to the second information to obtain third information;
[0039] Step S4, setting an inspection hole (5) according to the third information.
[0040] The step S4 includes step S41, step S42 and step S43, which specifically include:
[0041] Step S41, obtaining the stirrup ratio of the beam stirrups, the ultimate tensile strength of the concrete, and the calculated strength of the stirrups;
[0042] Step S42, calculating the common bearing capacity of the stirrups and concrete in the beam according to the stirrup ratio of the stirrups of the beam, the ultimate tensile strength of the concrete and the calculated strength of the stirrups;
[0043] Step S43, setting the opening diameter size of the inspection hole (5) according to the joint bearing capacity of the stirrups and concrete in the beam.
[0044] In this step, the specific calculation process of the joint bearing capacity of stirrups and concrete in the beam is:
[0045]
[0046] In the above formula, F is the combined bearing capacity of the stirrups and concrete in the beam, f s Calculated strength of stirrups, μ v is the stirrup ratio of the beam stirrups, f ct is the ultimate tensile strength of concrete.
[0047] The step S43 includes step S431, step S432 and step S433, which specifically include:
[0048] Step S431, obtaining the cross-section height of the beam, the shear force of the beam, the width of the beam, and the height from the stress resultant point in the longitudinal reinforcement in the tension zone to the compression edge;
[0049] Step S432, calculating according to the shear force of the beam, the width of the beam, the height from the stress resultant point in the longitudinal reinforcement in the tension zone to the compression edge, and the joint bearing capacity of the stirrups and concrete in the beam to obtain a calculation result;
[0050] Step S433, subtract the cross-sectional height of the beam from the calculated result to obtain the opening diameter size of the inspection hole (5).
[0051] In this embodiment, the specific calculation formula for the opening diameter of the inspection hole (5) is:
[0052]
[0053] In the above formula, d0 is the opening diameter of the inspection hole 5, h is the cross-section height of the beam, V is the shear force of the beam, b is the width of the beam, h0 is the cross-section height of the beam, and F is the joint bearing capacity of the stirrups and concrete in the beam. Usually, the above formula can be used to calculate the optimal opening size of the inspection hole 5 while ensuring the structural strength.
[0054] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.
[0055] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
[0057] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which 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. A beam-column type spatial rigid frame bridge, characterized in that: include: A foundation (1), wherein the foundation (1) is arranged on the ground and the foundation (1) is arranged perpendicular to the ground; Piers (2), the piers (2) are arranged on the top of the foundation (1), and a spacing is arranged between two adjacent piers (2); A cross beam (4), the cross beam (4) being arranged on the top of the pier (2); A longitudinal beam (3), wherein the longitudinal beam (3) is arranged between two adjacent transverse beams (4), and the tops of the longitudinal beam (3) and the transverse beam (4) are arranged on the same horizontal plane.
2. The beam-column type spatial rigid frame bridge according to claim 1, characterized in that: An inspection hole (5) is provided at the intersection of the cross beam (4) and the longitudinal beam (3).
3. The beam-column type spatial rigid frame bridge according to claim 2, characterized in that: The center of the inspection hole (5) coincides with the center of the crossbeam (4).
4. The beam-column type spatial rigid frame bridge according to claim 3 is characterized in that: The height of the inspection hole (5) is no greater than one third of the height of the crossbeam (4).
5. The beam-column type spatial rigid frame bridge according to claim 1, characterized in that: The height of the bottom surface of the longitudinal beam (3) is greater than the height of the bottom surface of the transverse beam (4).
6. The beam-column type space rigid frame bridge according to claim 2, characterized in that: The diameter of the inspection hole (5) is greater than 0.8 m.
7. A design method for a beam-column type space rigid frame bridge, using the beam-column type space rigid frame bridge as claimed in any one of claims 1 to 6, characterized in that: The following steps are involved: Acquire first information, wherein the first information includes normal stress data at various heights on a cross section of the beam; Analyze the stress condition of the beam according to the first information to obtain second information; Determine the location of the center of the inspection hole according to the second information to obtain third information; An inspection hole (5) is set according to the third information.
8. The beam-column type space rigid frame bridge design method according to claim 7 is characterized in that: Acquiring the first information includes: Obtain the moment of inertia of the cross-section of the beam, the bending moment borne by the beam, and the position information of the location where the stress is to be calculated; Calculate the height distance from the position information of the location where the stress is to be calculated to the center of the beam to obtain a first calculation result; Calculation is performed based on the first calculation result, the moment of inertia of the cross-section of the beam, and the bending moment borne by the beam to obtain normal stress data corresponding to the stress to be calculated.
9. The beam-column type space rigid frame bridge design method according to claim 7, characterized in that: Setting the inspection hole according to the third information includes: Obtain the stirrup ratio of beam stirrups, ultimate tensile strength of concrete, and calculated strength of stirrups; Calculate the combined bearing capacity of the stirrups and concrete in the beam according to the stirrup ratio of the stirrups of the beam, the ultimate tensile strength of the concrete and the calculated strength of the stirrups; The opening diameter of the inspection hole (5) is set according to the common bearing capacity of the stirrups and concrete in the crossbeam.
10. The beam-column type space rigid frame bridge design method according to claim 9, characterized in that: The opening diameter size of the inspection hole is set according to the common bearing capacity of the stirrups and concrete in the beam, including: Obtain the cross-section height of the beam, the shear force of the beam, the width of the beam, and the height from the stress resultant point in the longitudinal reinforcement in the tension zone to the compression edge; Calculation is performed based on the shear force of the beam, the width of the beam, the height from the stress resultant point in the longitudinal reinforcement in the tension zone to the compression edge, and the joint bearing capacity of the stirrups and concrete in the beam to obtain a calculation result; The cross-section height of the crossbeam is subtracted from the calculated result to obtain the opening diameter size of the inspection hole (5).