CN110195385A - A kind of staked type track girder for magnetic suspension route - Google Patents

Abstract

A superimposed track beam used for maglev lines belongs to the technical field of maglev transportation. The track beam includes an upper steel structure track slab, a lower load-bearing beam and a connecting mechanism between the two. The section of the upper steel structure track slab is T-like structure, the upper part is covered with a steel structure track plate and the top sliding plate, the interior is a hollow structure, and the two sides of the lower part are inwardly concave arcs, and there are functional areas on both sides in the width direction, and there are horizontal, Longitudinal stiffeners, a connection mechanism that can adjust the relative displacement of the upper steel structure track plate and the lower load-bearing beam is provided. The track beam includes an adjustable connection mechanism between the upper steel structure track slab and the lower load-bearing beam. The upper steel structure track slab is provided with horizontal and vertical stiffeners to realize the construction between the upper steel structure track slab and the lower load-bearing beam. The position can be adjusted to reduce the cross-sectional area and self-weight under the premise of ensuring the requirements.

Description

A Composite Track Beam for Magnetic Suspension Lines

technical field

The invention belongs to the technical field of maglev transportation, in particular to a superimposed track beam used for maglev lines.

Background technique

Maglev transportation is currently the fastest rail transportation mode in the world, with the advantages of high speed, energy saving, and low vibration and noise. On the basis of introducing and absorbing German technology, my country has built a number of maglev test lines through independent innovation. At present, there is no high-speed maglev transportation project in the world, and there is also a lack of track technology that matches the high-speed system. In order to further tap its speed advantage and develop high-speed maglev transportation, my country is currently exploring high-speed maglev transportation. Compared with the existing technology, its speed is greatly increased, and it puts forward new and more difficult requirements for vehicles and tracks. The track structure is one of the most important subsystems of the entire maglev transportation system, and it is particularly necessary to develop a track structure that matches its speed.

By studying the dynamic interaction between trains and rails under high-speed conditions, conducting necessary research and reasonable analysis on structure selection, track deformation and dynamic characteristics, etc., a track technology solution suitable for high-speed maglev is proposed, and it is convenient to solve the construction of track beams in application Key technical issues such as construction, large-scale transportation, and on-site fine-tuning and positioning. The biggest problem with the existing composite beams is that they are too heavy to be transported over long distances, and the constructed beam yards are required along the route.

Contents of the invention

The invention provides a superimposed track beam for a magnetic levitation line. The track beam includes an upper steel structure track plate and a lower load-bearing beam, which are connected by an adjustable connection mechanism. The upper steel structure track slab is equipped with transverse and longitudinal stiffeners, which realizes the adjustment of the construction position between the upper steel structure track slab and the lower load-bearing beam, and achieves the purpose of reducing the cross-sectional area and self-weight under the premise of ensuring the accuracy requirements.

A superimposed track beam applied to high-speed maglev lines provided by the present invention is mainly composed of three parts: an upper steel structure track plate with a functional area, a lower load-bearing beam and a connecting mechanism between them. The upper steel structure track slab takes a certain modulus as a system unit, and the steel used is manufactured and machined in the factory; the prestressed concrete box girder used for the lower load-bearing beam can adopt simply supported structure or continuous structure; the connecting mechanism is used to connect the upper layer Steel structure track slab, lower load-bearing beam.

The upper steel structure track slab directly bears the load of the train, adopts an integral all-steel structure, and is mainly composed of a steel structure slab, stiffeners, and function keys. The top sliding plate of the steel structure track slab, the lateral guide plates of the steel structure track slab on both sides, the dovetail grooves on the two lower edges, the bottom plate of the functional area, the curved bottom plate and the bottom steel structure track slab base together form the exterior of the steel structure track slab contour. Inside the steel structure track slab, a central longitudinal stiffener is arranged along the entire length of the track slab in the middle, and a side longitudinal stiffener is respectively arranged along the entire length of the track slab at the functional areas on both sides. guide plate parallel. In the vertical longitudinal stiffener direction, several rows of transverse stiffeners are evenly arranged. In the main body of the middle track slab, two central transverse stiffeners are set; one transverse stiffener for the functional area is set in each functional area on both sides, and the four stiffeners are distributed on the same straight line.

The top sliding plate of the steel structure track slab covers the entire track slab and is at the top of the track slab.

The lateral guide plate, middle and bottom of the steel structure track slab on both sides are welded and connected with the top sliding plate of the steel structure track slab, the transverse stiffener of the functional area, and the bottom plate of the functional area respectively.

The bottom plate of the steel structure track slab is at the bottom of the track slab, is equal in length and slightly narrower than the top slide plate of the steel structure track slab, and is parallel to it. A square shear key reserved hole is provided at each transverse stiffener in the middle along the upper edge, and a pullout key reserved hole is provided outside the outermost transverse stiffener at both ends.

The central transverse stiffener is tightly welded with the peripheral central longitudinal stiffener, edge longitudinal stiffener, steel structure track slab bottom plate, steel structure track slab top slide plate, arc bottom plate, and dovetail groove.

The load-bearing beam of the lower layer can adopt a simply supported or continuous beam structure, and adopts a prestressed concrete box girder, which is composed of a square load-bearing beam main body at the upper part and a wider load-bearing beam bottom plate extended at the lower part. The middle part of the main body of the load-bearing beam is hollowed out. A certain slope is set on the upper surface of the flange of the bottom plate of the load-bearing beam.

The connecting mechanism adopts anti-pull bolts and anti-shear keys. The anti-pull bolts are arranged at both ends of the steel structure track slab, and placed outside the middle transverse stiffeners on the outermost sides of both sides. The shear key is arranged at the bottom of the middle transverse stiffener in the middle part of the steel structure track slab.

The square steel pipe shear key is composed of a square steel pipe shear pin and a cubic base. The steel pipe shear pin is composed of a shear pin bottom plate and a square tube. The cubic base is a square box without a cover, and there is a concrete grouting pipe at the bottom. The size of the bottom plate of the shear pin is slightly smaller than the inner diameter of the cubic base, and it can be moved left and right inside for precision adjustment. The upper end of the square tube is reserved for the rib slot at the lower end of the transverse stiffener in the middle.

The cross-shaped steel shear key is composed of a cross-shaped shear pin and a cubic base. The cross-type shear pin is composed of a shear pin bottom plate, a shear pin main plate and two shear pin side plates. pin base plate. There are concave holes above and below where the shear pin side plate and the shear pin main board meet to form welding processing holes. The cubic base is a cubic rigid box without a cover, and there is a concrete grouting pipe in its lower part. The shear pin base plate size is slightly smaller than the inside diameter of the cubic base.

Advantage and effect of the present invention:

The composite beam of the invention can be prefabricated separately, assembled on site, convenient for transportation, greatly reduces transportation cost, reduces the weight of a single assembly unit, facilitates assembly, and greatly improves practicability. In the present invention, an adjustable connector is used between the upper steel structure track plate and the lower load-bearing beam to ensure that the connection position between the upper steel structure track plate and the lower load-bearing beam can be adjusted. Under the premise that the strength, rigidity, deformation and the like all meet the requirements, the invention has been verified by experiments to have superior dynamic performance, small cross-sectional area and cost saving.

The track of the invention can provide sufficient rigidity, effectively control vibration, and reduce bridge deformation caused by high-speed maglev vehicles. The high-speed maglev rail technical solution has the advantages of reasonable structure, clear force transmission, novel design, material saving, high installation accuracy, small vibration deformation, light weight, easy processing, transportation and hoisting, and good rigidity and ductility. The track technology draws on actual engineering experience, reasonable selection, and multi-angle analysis, which can provide sufficient stiffness, effectively control vibration, and reduce bridge deformation caused by high-speed maglev vehicles. The high-speed maglev rail technical solution has the advantages of reasonable structure, clear force transmission, novel design, material saving, high installation accuracy, small vibration deformation, light weight, easy processing, transportation and hoisting, and good rigidity and ductility.

Description of drawings

Fig. 1 composite track beam schematic diagram of the present invention;

Fig. 2 is the front view of the composite track beam of the present invention;

Fig. 3 internal structural diagram of steel structure track plate of the present invention;

Fig. 4 partial drawing of steel structure track slab of the present invention;

Fig. 5 schematic diagram of load-bearing beam of the present invention;

Fig. 6 is a schematic diagram of a square steel pipe shear bond of the present invention;

Fig. 7 is a schematic diagram of a cross-shaped shear bond of the present invention.

Components in the picture: 1—upper steel structure track slab, 2—lower bearing beam, 3—connection mechanism, 4—steel structure track slab top slide plate, 5—steel structure track slab side guide plate, 6—steel structure track slab Bottom plate, 7—dovetail groove, 8—central transverse stiffener, 9—transverse stiffener of functional area, 10—central longitudinal stiffener, 11—edge longitudinal stiffener, 12—curved bottom plate, 13—functional area bottom plate, 14 —Reserved holes for shear keys, 15—Reserved holes for pullout keys, 16—Processed holes for ribs, 17—Main body of load-bearing beams, 18—Bottom plate of load-bearing beams, 19—Cubic base, 20—Square steel pipe shear pins, 21 —cross type shear pin, 22—shear pin bottom plate, 23—square tube, 24—rib slot, 25—shear pin main board, 26—shear pin side plate, 27—concrete grouting pipe, 28—welding Processing holes.

Detailed ways

The present invention will be further explained below in conjunction with the accompanying drawings and embodiments.

Example 1

The composite track beam is mainly composed of three parts: the upper steel structure track slab 1 with functional areas, the lower load-bearing beam 2 and the connecting mechanism 3 between them. The upper steel structure track slab 1 takes 3.096 meters or other modulus as a system unit, and is made of steel in the factory and processed by machining; the prestressed concrete box girder 2 used for the lower load-bearing beam can adopt simply supported structure or continuous structure. The factory-prefabricated steel structure track slab is transported to the site, and connected with the completed lower load-bearing beam through the connection mechanism 3 to form a composite track beam structure.

The upper steel structure track slab provides three functional surfaces and functional areas of the functional area, and directly bears the train load, and transmits the train load to the load-bearing beam through the connecting mechanism. The steel structure track slab adopts an integral all-steel structure, which is divided into the main body of the middle track slab and the beam parts of the functional areas on both sides. It is mainly composed of steel structure slabs, stiffeners, and function keys. Among them, the function keys can be installed later or machined together with the steel structure panel, which has high precision and saves the later installation process. The top sliding plate of the steel structure track plate on the top 4, the side guide plate 5 of the steel structure track plate on both sides, the dovetail groove 7 on the two lower edges, the bottom plate 13 of the functional area, the curved bottom plate 12 and the bottom steel structure track plate bottom plate 6 are jointly enclosed Form the outer contour of the steel structure track plate 1. Inside the steel structure track slab 1, a central longitudinal stiffener 10 is arranged along the entire length of the track slab in the middle, and a side longitudinal stiffener 11 is respectively arranged along the entire length of the track slab at the functional areas on both sides. Stiffeners 11 are arranged in parallel with the lateral guide plates 5 of the steel structure track slab. In the direction perpendicular to the longitudinal stiffeners, a plurality of rows of transverse stiffeners, that is, the transverse stiffeners 8 in the middle and the transverse stiffeners 9 in the functional area, are evenly arranged. In the main body of the middle track slab, two middle transverse stiffeners 8 are arranged on the same horizontal line; one functional area transverse stiffener 9 is arranged in each functional area on both sides, and the four stiffeners are on the same straight line.

The sliding plate 4 at the top of the steel structure track slab covers the entire track slab and is at the top of the track slab.

The upper, middle and lower side guide plates 5 of the steel structure track slab on both sides are welded and connected with the top slide plate 4 of the steel structure track slab, the transverse stiffener 9 of the functional area, and the bottom plate 13 of the functional area respectively, playing the role of guiding the maglev vehicle .

The dovetail grooves 7 on both sides of the track plate are welded and fixed by longitudinal stiffening ribs 11 at the sides, the bottom plate 13 of the functional area and the arc bottom plate 12, and are used for installing electromechanical equipment.

The steel structure track slab bottom plate 6 is at the bottom of the track slab. It is equal in length, slightly narrower than the slide plate 4 at the top of the steel structure track plate, and is parallel thereto. A square shear key reserved hole 14 is provided at each transverse stiffener 8 in the middle along the upper edge, and a pullout key reserved hole is provided outside the outermost transverse stiffener 8 at both ends.

The central transverse stiffener 8 is tightly welded to the surrounding central longitudinal stiffener 10, edge longitudinal stiffener 11, steel structure track slab bottom plate 6, steel structure track slab top slide plate 4, arc bottom plate 12, and dovetail groove 7.

The lower edge of the transverse stiffener 9 in the functional area is in contact with the bottom plate 13 of the functional area to form a rib plate processing hole 16, which is convenient for welding and other processing and other construction operations. The rest of the sides are welded to the side guide plate 5 of the track slab, the top slide plate 4 of the steel structure track slab, and the longitudinal stiffeners 11 respectively.

The load-bearing beam 2 can adopt simply supported or continuous beam structure, can be prefabricated in factory or on site, and can also be cast in site. A prestressed concrete box girder is adopted, which is composed of a square load-bearing beam main body 17 at the upper part and a wider load-bearing beam bottom plate 18 extending at the lower part. The middle part of the load-bearing beam main body 17 is hollowed out, which can reduce the weight of the structure. A certain slope is set on the upper surface of the flange of the load-bearing beam base plate 18, which is convenient for drainage and garbage cleaning.

The connecting mechanism 3 of the superimposed track beam is used to connect the load-bearing beam 2 and the steel structure track plate 1, so that the two are closely connected and stressed as a whole. The connection mechanism 3 is divided into two types, one is anti-pull keys arranged at both ends of the steel structure track slab 1, which can use pull-out bolts to prevent the relative displacement of the load-bearing beam 2 and the steel structure track slab 1 in the vertical direction. The other type is the shear key arranged at the bottom of the transverse stiffener 8 in the middle of the middle part of the steel structure track slab 1 to prevent the relative displacement of the load-bearing beam 2 and the steel structure track slab 1 in the horizontal direction.

For the superimposed track beam, the present invention provides two kinds of high-precision adjustable shear keys, which are respectively square steel tube shear keys and cross-shaped steel shear keys. It can not only meet the needs of fine adjustment during installation, but also can be locked and consolidated with the supporting beam after the adjustment is completed.

The part of the shear key placed on the concrete load-bearing beam is pre-embedded after machining, and the diameter of the sealing part of the pre-embedded part is slightly smaller than that of the inner wall, which is convenient for grouting. The shape of the bottom of the square steel shear key or the cross-shaped steel shear key is smaller than the diameter of the embedded part, which is convenient for adjusting the horizontal displacement and vertical height. After the adjustment is completed, grout from the grouting pipe reserved for the embedded parts. The shear key can be positioned when it is pre-embedded, that is, the first-level precision adjustment; at the same time, during construction, the upper and lower connections can be adjusted to adapt to the uncontrollable error of concrete pouring and achieve high precision, which meets the needs of the line during the use and operation stage. Two-level adjustment is realized when settlement and deformation accumulate.

Square steel pipe shear key is made up of steel pipe shear pin 20 and cubic base 19. The steel pipe shear pin 20 is made up of a shear pin base plate 22 and a square tube 23, and the cubic base 19 is a cubic rigid box without a cover, and its bottom is vertically provided with a concrete grouting pipe 27. The size of the shear pin base plate 22 is slightly smaller than the inner diameter of the cubic base 19, and it can be moved left and right inside for precision adjustment. The upper end of the square tube 23 has a rib plate slot 24 for placing the lower end of the middle transverse stiffener 8. The lower end of the cubic base 19 is pre-buried and poured on the top surface of the load-bearing beam 2 according to the corresponding position. Its lower part has concrete grouting pipe 27 towards the outside of load-bearing beam 2, and exposes pipe mouth. The steel pipe shear pin 20 is inserted into the reserved hole 14 of the shear key of the steel structure track slab bottom plate 6, so that the lower end of the middle transverse stiffener 8 snaps into the rib plate slot 24 of the steel pipe shear pin 20. The lower end of the steel pipe shear pin 20 is put into the cubic base 19 at the corresponding position. After fine-tuning the in-plane position, pour concrete from the concrete grouting pipe 27 of the cubic base 19 to fill the whole cubic base 19 and the steel pipe shear pin 20. gap. After the concrete is hardened, the shear pins can make the load-bearing beam 2 and the steel structure track slab 1 work together to resist lateral displacement.

The cross-shaped steel shear key is composed of a cross-shaped shear pin 21 and a cubic base 19. The cross type shear pin 21 is made up of a shear pin base plate 22, a shear pin main board 25 and two shear pin side plates 26, the shear pin main board 25 is connected vertically with the two shear pin side plates 26, and Common welding is connected on the bottom plate 22 of the shear pin. The upper and lower joints of the shear pin side plate 26 and the shear pin main board 25 have concave holes to form welding holes 28, which is convenient for welding operations. Cube base 19 is each square box without lid, and its bottom is vertically provided with concrete grouting pipe 27. The size of the shear pin base plate 22 is slightly smaller than the inner diameter of the cubic base 19, and can be moved left and right inside it for precision adjustment. The lower end of the cubic base 19 is pre-buried and poured on the top surface of the load-bearing beam 2 according to the corresponding position. Its lower part has concrete grouting pipe 27 towards the outside of load-bearing beam 2, and exposes pipe mouth. Cross-shaped shear pin 21 inserts the shear key reserved hole 14 of steel structure track plate base plate 6, welds and connects after making middle part transverse stiffener 8 lower ends align with shear pin main board 25 upper ends. Put the lower end of the cross-shaped shear pin 21 into the cubic base 19 at the corresponding position. After fine-tuning the in-plane position, pour concrete from the concrete grouting pipe 27 of the cubic base 19 to fill the entire cubic base 19 and the cross-shaped shear pin. 21 gaps. After the concrete is hardened, the shear pins can make the load-bearing beam 2 and the steel structure track slab 1 work together to resist lateral displacement.

The load-bearing beam 2 and the steel structure track slab 1 can be assembled in the factory, and then transported to the site in a unified manner, then hoisted, installed and positioned; the load-bearing beam 2 and the steel structure track slab 1 can also be transported to the site separately, hoisted separately, and wait for load-bearing After the initial positioning of the beam is completed, a temporary scaffold is built next to the track, and the steel structure track plate 1 is hoisted to the load-bearing beam, and then the two are connected, installed, and positioned precisely.

The load-bearing beam 2 and the steel structure track plate 1 are connected through the anti-pull key and the shear key. After the steel track plate and the load-bearing beam are positioned, grout is injected in the reserved grouting hole to consolidate it so that the whole is stressed. .

Claims (10)

1. a kind of staked type track girder for magnetic suspension route, which is characterized in that the track girder includes upper layer steel construction rail Guidance tape (1), lower layer's spandrel girder (2) and bindiny mechanism between the two (3), upper layer steel construction track plates (1) section are Class T-type structure, top are covered with guide plate (4) at the top of steel construction track plates, and inside is hollow structure, and lower section both sides are inside The arc of recess is equipped with functional areas in width direction, is internally provided with transverse direction, longitudinal stiffener, the lower layer holds inside two sides Weight beam (2) is prestressed concrete box girder, is equipped between the upper layer steel construction track plates (1) and lower layer's spandrel girder (2) adjustable The bindiny mechanism (3) of both whole relative displacement, the upper layer steel construction track plates (1) are using certain modulus as a system list Member, steel used make and are machined out in factory.

2. a kind of staked type track girder for magnetic suspension route according to claim 1, which is characterized in that the upper layer Steel construction track plates (1) are that top is equipped with guide plate (4) at the top of steel construction track plates, guide plate at the top of steel construction track plates (4) two sides are equipped with steel construction track plates vertically downward and are directed laterally to plate (5), and the steel construction track plates are directed laterally to plate (5) Lower end successively symmetrical connection function area bottom plate (13), dovetail groove (7), curved plate (12) from outside to inside, the curved plate (12) lower section is connected with steel construction track plates bottom plate (6).

3. a kind of staked type track girder for magnetic suspension route according to claim 2, which is characterized in that the steel knot The internal longitudinally middle position of structure track plates (1) is equipped with middle part longitudinal stiffener (10), and both sides are equipped with edge longitudinal stiffener (11), The middle part longitudinal stiffener (10), the elongated setting of edge longitudinal stiffener (11) are directed laterally to plate (5) with steel construction track plates In parallel, the edge longitudinal stiffener (11) and steel construction track plates, which are directed laterally between plate (5), forms functional areas, the steel knot Structure track plates (1) inner transverse is uniformly arranged transverse stiffener, and the transverse stiffener and longitudinal stiffener square crossing are arranged, Its shape and the internal structure of steel construction track plates (1) match.

4. a kind of staked type track girder for magnetic suspension route according to claim 3, which is characterized in that the edge Longitudinal stiffener (11) is arranged on the center of dovetail groove (7)；The transverse stiffener includes middle part transverse stiffener (8), functional areas transverse stiffener (9)；In center railway plate main body, two pieces of middle part transverse stiffeners (8) are set；Both sides functional areas One functional areas transverse stiffener (9) of interior each setting, four pieces of ribbed stiffeners are distributed on same straight line.

5. a kind of staked type track girder for magnetic suspension route according to claim 3, which is characterized in that the steel knot Rectangular shear key reserving hole (14) is offered along intermediate each transverse stiffener (8) on structure track plates bottom plate (6), two Hold outermost transverse stiffener (8) that resistance to plucking key reserving hole (15) are set outside.

6. a kind of staked type track girder for magnetic suspension route according to claim 1, which is characterized in that the lower layer Spandrel girder (2) is made of the rectangular load-bearing beam body (17) in top and bottom bearing beam bottom plate (18), the load-bearing beam body (17) certain slope is arranged in middle part hollow out, spandrel girder bottom plate (18) edge of a wing upper surface.

7. a kind of staked type track girder for magnetic suspension route according to claim 5, which is characterized in that the connection Mechanism (3) uses resistance to plucking bolt and shear key, and the steel construction track plates (1) and lower layer's spandrel girder (2) rear and front end are through resistance to plucking Bolt is fixedly linked, through shear key and lower layer's spandrel girder (2) below transverse stiffener (8) in the middle part of steel construction track plates (1) bottom It is connected.

8. a kind of staked type track girder for magnetic suspension route according to claim 7, which is characterized in that the shearing resistance Key is square steel tube shear key, including square steel tube shear-pin (20) and cube pedestal (19), the connection of square steel tube shear-pin (20) bottom Having shear-pin bottom plate (22), the square steel tube shear-pin (20) and shear-pin bottom plate (22) are integrally placed in a cube pedestal (19), Shear-pin bottom plate (22) size is less than cube pedestal (19) internal diameter, can move inside it, the square steel tube shear-pin (20) square tube (23) upper end is formed with the floor slot (24) to match with middle part transverse stiffener (8), described cube of pedestal (19) lower part is equipped with concrete grouting pipe (27).

9. a kind of staked type track girder for magnetic suspension route according to claim 7, which is characterized in that the shearing resistance Key is cross-shaped steel shear key, including cross shear-pin (21), cube pedestal (19), and the cross shear-pin (21) is anti- It cuts off mainboard (25) and shear-pin side plate (26) and is mutually perpendicular to welding and formed cross, bottom is welded with shear-pin bottom plate (22), the shear-pin bottom plate (22) is placed in a cube pedestal (19), and shear-pin bottom plate (22) size is less than cube pedestal (19) Internal diameter, described cube of pedestal (19) lower part are equipped with concrete grouting pipe (27).

10. a kind of staked type track girder for magnetic suspension route according to claim 7, which is characterized in that described anti- Cutting off side plate (26) and shear-pin mainboard (25) joint, there are shrinkage pools to form welding processing hole (28) up and down.