CN205636467U - Triangle -shaped steel truss bridge of limb is divided to Y shape - Google Patents

Abstract

The utility model discloses a triangular steel truss bridge suitable for Y-shaped split limbs with a span of less than 200m. The intersection point of the main girder, truss 1 and two truss 2 is the highest truss height of the main girder of the bridge. The main girder of the bridge is a tripod as a whole in space, and the plane of the main girder of the bridge is Y-shaped. The V-shaped main truss limbs in the main girder of the girder bridge. This type of bridge is shaped like a tripod as a whole. The planar shape is a Y-shaped limb. Under the premise of ensuring a large spanning capacity, the thickness below the bridge deck is small, the overall rigidity is large, and the wind and earthquake resistance is good. At the same time, its novel and beautiful shape can be used as a city landmark.

Description

A sort of Y Formal limbs triangular steel truss bridge

technical field

The utility model relates to a half-piercing steel truss bridge in the field of bridge type scheme design, in particular to a triangular steel truss bridge suitable for Y-shaped split limbs with a span of less than 200m.

Background technique

Traditional steel truss bridges are widely used in highway and railway bridge construction, and are bridge structures with very strong spanning capacity. For more than half a century, a large number of steel truss bridges have been built in my country, and this type of bridge occupies an important position in the bridge steel structure. Under the premise of today's urban bridge construction, the aesthetic feeling of the building is obviously very important; the long-span truss girder bridge is often difficult to meet the requirements for the shape of the bridge because its structural form is too classic and single. At the same time, for specific construction conditions such as T-shaped intersections in cities, roads on the island, and limited land acquisition and demolition, conventional steel truss bridges are difficult to apply to these situations, and bifurcated special-shaped structures are often required. Based on the classic steel truss bridge, a semi-penetrating steel truss bridge with a Y-shaped split limb in plane shape and a triangular facade shape, which is suitable for a span of less than 200m, is proposed, that is, a modification of steel truss girder; The urban bridge construction under the above circumstances provides a better bridge type solution.

Utility model content

The purpose of this utility model is to provide a triangular steel truss bridge suitable for Y-shaped limbs with a span of less than 200m. Its planar shape is Y-shaped limbs, and its facade shape is triangular.

The solution of the utility model to solve the technical problem is: a triangular steel truss girder bridge with Y-shaped split limbs, including a truss with a triangular or open trapezoidal cross-section formed by splicing two girders through beams and flat longitudinal joints. And two trusses 2 with an L-shaped cross section formed by splicing the truss 2, the beam, the horizontal longitudinal joint and the side longitudinal beam respectively, the main beam of the bridge formed by the intersection of one end of the truss 1 and the two truss 2, and the truss The vertex of the intersection of the first and the two trusses is the highest point of the truss height of the bridge girder. The bridge girder is a tripod as a whole in space, and the plane of the bridge girder is Y-shaped. The two trusses The V-shaped main truss limbs in the main girder of the bridge spliced into a Y shape.

As a further improvement of the above technical solution, the stringer one includes a stringer-upper chord and a stringer lower chord, and a stringer-vertical and a stringer are arranged between the stringer-upper chord and the stringer lower chord A slanting bar, the beam and the horizontal joint in the first truss are located between the lower chords of the two trusses, the second truss includes the upper chord of the second truss and the lower chord of the second truss, and the upper chord of the second truss Between the bar and the second lower chord of the truss, the second vertical bar of the truss and the second oblique bar of the truss are arranged. The side longitudinal beams in the truss 2 are distributed in the inner space between the two truss 2 in a V shape, the upper end surface of the beam is laid with a bridge deck, and the lower chord of the second truss is docked with the lower chord of the adjacent truss, The second upper chord of the girder is butted with the adjacent first upper chord of the girder.

As a further improvement of the above technical solution, the crossbeams in the first truss are respectively coplanar with the vertical bars in the two trusses to form a triangular or open trapezoidal truss-steel frame, and the truss-steel frame The first truss is formed by connecting the first chord of the truss, the lower chord of the truss, and the middle longitudinal beam; the beams located in the same truss two and the second vertical bars of the truss are coplanar to form an L-shaped steel frame, and the L-shaped The steel frame is connected by the second upper chord of the truss, the second lower chord of the truss and the side longitudinal beam to form the second truss.

As a further improvement of the above technical solution, the upper parts of the two pieces of truss 1 located at the intersection of truss 1 and truss 2 are connected by connecting rods between trusses.

As a further improvement of the above technical solution, the plane angle between the side longitudinal beams in the two trusses 2 is 50-70°, and the plane between the lower chord of the truss and its adjacent second truss chord The included angle is 150~160°.

As a further improvement of the above technical solution, the cross-sections of the lower chord of the girder, the first upper chord of the girder, the second lower chord of the girder, and the second upper chord of the girder are parallelograms, and the cross-section of the beam, the first vertical bar of the girder, The cross-sections of the first slanting bar of the truss, the second vertical bar of the truss and the second slanting bar of the truss are box-shaped or H-shaped.

As a further improvement of the above technical solution, the lower end surfaces of the first truss and the two second trusses are respectively equipped with substructures.

The beneficial effects of the utility model are:

(1) On the premise of ensuring a large spanning capacity, the thickness of the structure below the deck of the bridge in the utility model (thickness from the road surface to the bottom of the beam) is small; at the same time, it is a bifurcated structure in space. For those with clearance restrictions, As well as the special urban construction conditions such as right-in and right-out Shangdao roads and T-shaped intersections, the bridge type proposed in this proposal has advantages over other types of girder bridges.

(2) The main girder of the bridge adopts a tripod-type structure, which has high overall rigidity and good wind and earthquake resistance. Especially when this bridge type is used for pedestrian bridges, it can effectively avoid the problem of insufficient rigidity of long-span pedestrian bridges.

(3) The proposed bridge structure is novel in form and beautiful in shape, and can be used as a landmark building to help enhance the city image.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following will briefly describe the accompanying drawings that are used in the description of the embodiments. Apparently, the drawings described are only some embodiments of the utility model, not all embodiments, and those skilled in the art can also obtain other designs and drawings according to these drawings without creative work.

Fig. 1 is a side view of the utility model;

Fig. 2 is the top view of the utility model;

Fig. 3 is the sectional view of A-A direction;

Fig. 4 is the sectional view of B-B direction;

Fig. 5 is a three-dimensional diagram of the utility model;

Fig. 6 is the elevation view of beam one;

Figure 7 is an elevation view of the second girder.

detailed description

The idea, specific structure and technical effects of the present utility model will be clearly and completely described below in conjunction with the embodiments and accompanying drawings, so as to fully understand the purpose, characteristics and effects of the present utility model. Apparently, the described embodiments are only some of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, other embodiments obtained by those skilled in the art without paying creative efforts, All belong to the protection scope of the utility model. In addition, all the connection/connection relationships mentioned in this article do not refer to the direct connection of components, but mean that a better connection structure can be formed by adding or reducing connection accessories according to specific implementation conditions.

Referring to Figures 1 to 7, a triangular steel truss girder bridge with Y-shaped legs includes a truss 1 with a triangular or open trapezoidal cross-section formed by splicing two girders 14 through beams 8 and flat longitudinal joints 4 and Two trusses 2 with an L-shaped cross section are formed by splicing trusses 24, beams 8, horizontal longitudinal joints 4 and side longitudinal beams 5 respectively, and one end of the trusses 1 and two pieces of trusses 2 meet to form The main beam of the bridge, the apex of the intersection of truss one 1 and two pieces of said truss two 2 is the highest point of the truss height of the bridge main girder, the bridge main girder is a tripod as a whole in space, and the plane of the bridge main girder is Y-shaped, two pieces of the truss 2 are spliced to form a V-shaped main truss limb part in the main girder of a Y-shaped bridge.

Further as a preferred embodiment, the stringer one 14 includes a stringer upper chord 10 and a stringer lower chord 13, and a stringer one is arranged between the stringer upper chord 10 and the stringer lower chord 13. The vertical bar 12 and the first slanting bar 11 of the truss, the crossbeam 8 and the flat longitudinal connection 4 in the first truss are located between the lower chords 13 of the two trusses, and the second 24 of the trusses includes the upper chord 20 of the second truss and The second truss lower chord 23, the second truss upper chord 20 and the second truss lower chord 23 are arranged with the second truss vertical bar 22 and the second truss oblique bar 21, the beam 8 in the truss 2 is flat The vertical connection 4 is located between the side longitudinal beam 5 and the lower chord 23 of the second truss, and the side longitudinal beams 5 respectively located in the two trusses 2 are distributed in the inner space between the two trusses 2 in a V shape. The bridge deck 7 is laid on the upper end surface of 8, the second truss lower chord 23 is docked with its adjacent truss lower chord 13, and the second truss upper chord 20 is butted with its adjacent truss first upper chord 10.

Further as a preferred embodiment, the beams 8 located in the truss-1 are coplanar with the truss-vertical bars 12 in the two truss-14 respectively to form a triangular or open trapezoidal truss-steel frame, and the truss A steel frame is connected by the first chord 10 of the truss, the lower chord 13 of the truss and the middle longitudinal beam 6 to form the first truss 1; the beam 8 and the second vertical bar 24 of the truss are located in the same plane behind the second truss An L-shaped steel frame is formed, and the L-shaped steel frame is connected to form the second truss 2 by connecting the second upper chord 20 of the truss, the lower chord 23 of the second truss and the side longitudinal beam 5.

Further as a preferred embodiment, the upper parts of the two truss sheets 14 located at the intersection of truss 1 and truss 2 are connected by connecting rods between trusses, and then truss 1 is at the intersection of truss 1 and truss 2. The formed cross-section is triangular, and the cross-sections of the remaining positions in the truss-1 are triangular cross-sections with the upper end open.

Viewed from the cross-section, the two girders 14 are inwardly inclined, as shown in Figure 4, forming a triangular or open trapezoidal section; the bridge deck 7 is supported on the beam 8, and the beam 8 is connected to the lower chord 13 of the girder. The way of force transmission is: bridge deck 7→beam 8→lower chord 13 of truss 14→substructure. The limb section of the main beam (see attached drawing 3), the beam 8 is semi-cantilever connected to the second truss 24, forming an L-shaped section. The beam 8 of this section is coplanar with the second vertical bar 22 of the truss, forming a series of L-shaped steel frames of different sizes. The V-shaped main truss limbs in the main girder of the bridge. The load transmission path of this section is: bridge deck 7 → crossbeam 8 → truss 2 lower chord 23 and side longitudinal girder 5 → truss 2 24 → substructure.

Further as a preferred embodiment, the plane angle between the side stringers 5 in the two trusses 2 is 50-70°, preferably, the plane between the side stringers 5 in the two trusses 2 The included angle is 60°; the plane angle between the lower chord of truss one 1 and its adjacent truss two 2 lower chords is 150-160°, preferably, the lower chord of truss one 1 and its adjacent truss two The plane angle between the 2 bottom chords is 153°.

Further as a preferred embodiment, the cross sections of the lower chord 13 of the truss, the first upper chord 10 of the truss, the second lower chord 23 of the truss and the second upper chord 20 of the truss are parallelograms. The cross-sections of the first vertical bar 12, the first slanting bar 11 of the truss, the second vertical bar 22 of the truss and the second slanting bar 21 of the truss are box-shaped or H-shaped.

The bridge structure system in the utility model can adopt two basic structural systems of one-span simply supported truss girder or two-span continuous truss girder. In addition, when the middle pier adopts a two-span continuous structural system, the first slanting bar 11 and the second slanting bar 21 of the truss are both tie rods, and then they can be made into a cable structure, and the internal force of the truss can be optimized by adjusting the cable force distribution, the whole bridge is further transformed into a truss-cable combination system. Each of these structural systems has its own advantages and disadvantages. In the specific design, various factors such as project cost, structural force, and clearance under the bridge are generally considered comprehensively, and the optimal structural system is determined by comprehensive comparison. The cross-section type of the truss members in this proposal can adopt various forms. In addition to considering the beautiful appearance, the chord is recommended to adopt a parallelogram section, and other components can use box-shaped, H-shaped or other forms of cross-section. The connection method of the main girder components can be fully welded or high-strength bolts. The structure of the bridge deck 7 can adopt the structural form of separated orthotropic steel bridge deck, slab-truss type orthotropic steel bridge deck, and steel-concrete composite beam. During the specific construction, according to the conditions of on-site transportation and other conditions, various construction methods such as full hall support, jacking, and hanging and hoisting can be used for construction. It provides a variety of options for bridge design and construction personnel.

As a further preferred embodiment, the lower end surfaces of the first truss 1 and the two trusses 2 are respectively equipped with substructures 3 .

The following is a preferred embodiment of the present utility model:

The bridge is a bridge of the Zhongshangdao road in a city, and its main function is to connect a certain Binjiang Road and a certain small island. The bridge type is a half-piercing triangular steel truss simply supported girder bridge with Y-shaped limbs. It is bifurcated into two limbs on the city side, with a span of 155m and a truss height of 0-18m. The entire bridge plane is "Y-shaped". Surface 7 is paved with orthotropic slabs, and the width of bridge deck 7 is designed to be 7.8~15.6m (two lanes on the island side) and 4.4m (two single lanes on the city side). The main truss adopts "N-type" truss, which is composed of 4 triangular-shaped trusses, including two trusses 14 and two trusses 24, and the internode length of the truss is 8.88m. The included angle between the two limbs of the main truss limb is 60°, and the intersection angle between the limb limb of the main truss and the lower chord of the undivided limb part of the main truss is 153°. The span ratio from the apex of the triangular truss to the two fulcrums is the golden ratio 1:0.618.

Stringer 1 upper chord 10, stringer 2 upper chord 20, stringer 1st chord 13, stringer 2 lower chord 23, stringer 1 vertical rod 12, stringer 2 vertical rod 22, stringer 1 oblique rod 11, stringer The inclined bars 21 and the side longitudinal beams 5 of the second section adopt box-shaped sections; the horizontal longitudinal joints 4, the middle longitudinal beams 6 and the cross beams 8 adopt H-shaped sections. The chords are made of Q500qENH steel. The members of the first upper chord 10 of the truss and the second upper chord 20 of the truss are 1910mm high and 1207mm wide, which is a box girder parallelogram section; 68.3°, plate thickness 36~54mm. The first chord 13 of the girder and the second lower chord 23 of the girder are 2047mm high and 1225mm wide, which is a box girder parallelogram section; the thickness of the chord is 28~50mm. The bridge adopts integral fully welded joints, that is, the upper and lower chords of each section are a prefabricated node, the length of each section of the lower chord 13 of the girder piece and the second lower chord 23 of the girder piece is 8875 mm, and the length of each section of the first upper chord 10 of the girder piece is 8892 mm. Each section of the second upper chord 20 of the truss is 8912mm long. The first vertical bar 12 of the girder and the second vertical bar 22 of the girder are made of Q420qE steel, box-shaped section, 1138mm high, 666mm wide, 18mm thick, and the vertical bar length is 3590mm~16966mm. The first slanting bar 11 of the truss piece and the second slanting bar 21 of the truss piece are made of Q420qE steel, with a box section, a height of 1138mm, a width of 450mm, a plate thickness of 18mm, and a length of the slanting bar of 10350mm~19959mm. Side longitudinal beam 59 is made of Q420qE steel, box section, height 1599~1687mm, width 888mm, plate thickness 16~24mm, designed according to the bending member, and the length of each segment is 8891mm. The compression plates of all box-section members are provided with stiffeners of the same thickness as the mother plate. Side beams 5 are arranged between beams 8 in truss one 1. The cross-section is H-shaped, the beam height is 1471 mm, the flange width is 600 mm, and the thickness is 32 mm. Beam 8 is an H-shaped section with a beam height of 1299~1617mm. The cross slope is set by changing the beam height. The flange width is 800mm and the thickness is 32mm. The horizontal longitudinal connection 4 connects the middle longitudinal beam 6 and the 23 nodes of the second lower chord of the girder, and is arranged in N rows. The horizontal and vertical joint 4 sections are H-shaped sections with a height of 500mm, a flange width of 650mm, and a thickness of 28mm. Horizontal longitudinal joint 4, middle longitudinal beam 6 and cross beam 8 are all made of Q370qE steel. Deck 7 adopts orthotropic slab deck, U-shaped stiffeners, Q370qE steel, and the thickness of the deck is 16mm. The bridge deck pavement is 5.5cm epoxy asphalt concrete.

The pier is a thin-walled plate pier with a rectangular cross-section. The single-row pile foundation adopts cast-in-place piles with drilled (punched) holes, and the pile diameter is 1.2m. The caps are four pile caps and eight pile caps. Depending on the pile diameter, the thickness of the cap is different. The thickness of the cap is 1.6m when the pile diameter is 120cm, and the thickness of the cap is 2.4m if the pile diameter is 180cm. The pile foundation adopts bored cast-in-situ piles or punched cast-in-place piles, with diameters of 120 and 180cm, and the bearing capacity of single piles is 4500kN and 11000kN respectively. The average pile length is about 40m.

The specific implementation steps are as follows:

(1) The construction platform of the substructure 3 of the main girder is completed by inserting steel casings.

(2) Transport the prefabricated parts of the truss factory to the on-site temporary assembly platform for on-site welding of the prefabricated sections.

(3) A crane walking channel is erected on the bridge deck, and the steel structure of the bridge is installed sequentially from one side to the other side along with the crane walking.

(4) Complete the installation of the main truss and weld the orthotropic steel bridge deck on site.

(5) Lay bridge deck pavement and install auxiliary facilities.

The above is a specific description of the preferred embodiments of the present utility model, but the invention is not limited to the described embodiments, those skilled in the art can also make various equivalent modifications without violating the spirit of the present utility model Or replacement, these equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims (7)

1. a triangular steel truss bridge of Y-shaped limbs, is characterized in that: comprise a truss one by two trusses one by crossbeam and flat vertical joint splicing and form cross section as triangle or opening trapezoid and two respectively by truss Sheet 2, cross beams, horizontal longitudinal joints and side longitudinal beams are spliced to form truss 2 with an L-shaped cross-section. One end of truss 1 and two truss 2 meet to form the main beam of the bridge. Truss 1 and two trusses The apex of the intersection of the two trusses is the highest point of the truss height of the main girder of the bridge. The main girder of the bridge is a triangular frame as a whole in space, and the plane of the main girder of the bridge is Y-shaped. The V-shaped main truss limbs in the main girder of the bridge. 2. the triangular steel truss bridge of Y-shaped split limb according to claim 1, is characterized in that: described stringer piece-comprises stringer piece-upper chord and stringer piece lower chord, described stringer piece-upper chord and stringer piece A truss-vertical bar and a truss-inclined bar are arranged between the lower chords of the trusses. The second upper chord and the second lower chord of the truss, the second upper chord of the truss and the second lower chord of the truss are arranged with the second vertical bar of the truss and the second oblique bar of the truss. Between the side longitudinal beam and the lower chord of the second truss, the side longitudinal beams respectively located in the two trusses are distributed in the inner space between the two trusses in a V shape, and the upper end surface of the beam is laid with a bridge deck, so The second lower chord of the truss is butted with the adjacent lower chord of the truss, and the second upper chord of the truss is butted with the adjacent first upper chord of the truss. 3. The triangular steel truss bridge of Y-shaped split limb according to claim 2, is characterized in that: the crossbeam that is positioned at described truss one is coplanar with the girder one vertical bar in two girder ones respectively A triangular or open trapezoidal truss-steel frame, the truss-steel frame is connected by the truss-top chord, the truss-bottom chord and the middle longitudinal beam to form the truss one; the beam and the truss in the same truss two The two vertical bars are coplanar to form an L-shaped steel frame, and the L-shaped steel frame is connected to form the second truss through the second upper chord of the truss, the second lower chord of the truss, and the side longitudinal beam. 4. The triangular steel truss bridge with Y-shaped split limbs according to claim 2 or 3, characterized in that: the tops of the two truss pieces one at the junction of the truss one and the two trusses pass through the connecting rods between the trusses connect. 5. according to the triangular steel truss bridge of Y shape split limb described in claim 1 or 2, it is characterized in that: the plane angle between the side longitudinal beams in two described trusses is 50～70 °, so The plane angle between the lower chord of the truss and the adjacent second lower chord of the truss is 150-160°. 6. The triangular steel truss bridge of Y-shaped split limbs according to claim 2, characterized in that: the lower chord of the girder, the first upper chord of the girder, the second lower chord of the girder and the second upper chord of the girder The cross-section is a parallelogram, and the cross-sections of the cross beam, stringer-vertical bar, stringer-slant bar, stringer-two vertical bar and stringer-slant bar are box-shaped or H-shaped. 7. The triangular steel truss bridge with Y-shaped split limbs according to claim 1, characterized in that: the lower end surfaces of the first truss and the two trusses are respectively equipped with substructures.