A plate-truss combined system landscape bridge and construction method thereof

Abstract

The present invention discloses a landscape bridge of a plate-truss combination system, including a truss, wherein the truss includes an inner truss piece, an outer truss piece and an upper flat joint, wherein the inner truss piece, the outer truss piece and the upper flat joint are all Warren trusses, and the three plane-stable Warren trusses form a stable triangle in space by sharing a chord rod, which greatly increases the out-of-plane stiffness of the main truss, and the overall structural stiffness is large, and the wind and earthquake resistance are good. The upper flat joint is a Warren truss in the horizontal direction, the inner truss piece is a Warren truss in the vertical direction, and the outer truss piece is an outward-inclined curved surface Warren truss, which has a regular structure, a novel form, a beautiful shape, and a good landscape effect. At the same time, a construction method is disclosed, which adopts top-pushing construction, and necessary temporary piers are set for the side span during top-pushing, and the main beams on both sides of the side span are temporarily consolidated with the main beams of the main span, and the main beams of the side span are used as guide beams for top-pushing to reduce construction costs.

Description

Technical Field

[0001] The present invention relates to the technical field of bridges, and in particular to a plate-truss combined system landscape bridge and a construction method thereof. Background Art

[0002] Steel trusses are widely used in the construction of highway and railway bridges because of their strong spanning capacity and good landscape effect. In recent decades, many steel truss bridges have been newly built in China, and this type of bridge occupies an important position in bridge engineering. With the progress of the economy, today's bridges not only need to meet the function of traffic, but also take into account the aesthetics of the building. The traditional steel truss beam bridge is composed of multiple vertical main trusses with transverse connections. Its structural form is too simple and classic, and it is difficult to meet the requirements of bridge modeling for beautiful appearance. At the same time, the standard value of the load of traditional steel truss beam bridges is low, resulting in insufficient bearing capacity of a large number of bridges, overall structural instability, weak wind and earthquake resistance, and easy damage during use. Summary of the invention

[0003] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art, and to provide a plate-truss composite system landscape bridge and a construction method thereof, which can enhance the bearing capacity of the landscape bridge, improve its wind and earthquake resistance, and make the landscape bridge more beautiful.

[0004] The technical solution adopted by the present invention is: a plate-truss combined system landscape bridge, including a truss, the truss includes an inner truss piece, an outer truss piece and an upper horizontal joint; the inner truss piece includes a first upper chord, a first lower chord and a first web member; the outer truss piece includes a second upper chord, a second lower chord and a second web member; the first lower chord and the second lower chord are common components; an upper horizontal web member is provided between the first upper chord and the second upper chord, and the first upper chord, the second upper chord and the upper horizontal web member constitute an upper horizontal joint; the first web member, the second web member and the upper horizontal web member are arranged in a Warren truss structure, and the first web member and the second web member are arranged alternately.

[0005] Beneficial effects: The plate-truss composite system landscape bridge is provided with inner truss pieces and outer truss pieces, and the web members of the inner truss pieces are arranged alternately with the web members of the outer truss pieces, with a regular structure, novel form, beautiful shape and good landscape effect. Under the premise of ensuring a large spanning capacity, each component of the main truss of the bridge structure is a plane-stable Warren truss, and each main truss is composed of three stable Warren trusses. The three plane-stable Warren trusses form a spatially stable triangle in space by sharing chords, which greatly increases the out-of-plane stiffness of the single main truss and the overall stiffness of the structure, and improves the wind and earthquake resistance performance.

[0006] Furthermore, the inner truss piece is arranged vertically, and the outer truss piece is arranged inclined outwardly.

[0007] Furthermore, it also includes an arc-shaped bridge portal, which is located at both ends of the truss, a pair of the trusses are connected through the arc-shaped bridge portal, and the first upper chord rod and the second upper chord rod are curved rods with a low middle and high ends.

[0008] Furthermore, the curved portal frame includes a portal frame upper chord, a portal frame lower chord is arranged below the portal frame upper chord, ends of the portal frame lower chord are connected to the end webs of the inner truss and the outer truss, reinforcing webs are arranged between the ends of the portal frame lower chord, reinforcing webs are arranged at the end joining points of the first upper chord and the second upper chord, and the portal frame upper chord and the portal frame lower chord are staggeredly connected by portal frame webs.

[0009] Furthermore, a mid-span top frame is arranged between the first upper chords on both sides of the landscape bridge body. The mid-span top frame is located in the middle of the landscape bridge body and protrudes upward.

[0010] Furthermore, it also includes a bridge deck system, which includes a main beam, a cross beam, a longitudinal beam and a bridge deck. The main beam is located on both sides of the landscape bridge body and is a common component with the first lower chord and the second lower chord. The cross beam is used to connect the main beams on both sides and is arranged at the intersection of the first web member and the second web member in the truss and the main beam; the longitudinal beam is arranged between the main beams, and the bridge deck is arranged between the main beams.

[0011] Furthermore, it also includes a main pier, which includes pier legs and cross columns. The pier legs are provided with supports at the top, and the cross columns are used to connect the pier legs on both sides of the landscape bridge body.

[0012] Furthermore, the plate-truss composite system landscape bridge includes a main span and a side span, the truss is arranged on the main span, and the side span is only provided with the bridge deck system. The bridge deck system of the side span is discontinuous with the bridge deck system of the main span and expansion joints are arranged, and the side span and the main span form a simply supported structure.

[0013] Furthermore, the bridge deck is entirely or partially made of high-strength glass.

[0014] A construction method for a landscape bridge of a plate-truss composite system, wherein the main bridge is constructed by jacking, and the jacking construction method comprises the following steps: step 1: setting up a construction platform and a steel cofferdam to complete the construction of the main pier and the temporary pier; step 2: splicing the side span steel plate composite beams on site as guide beams, and welding and splicing the main span Warren steel trusses on site behind the guide beams; step 3: jacking the guide beams and the main span to the designed position; step 4: after the jacking is completed, removing the temporary piers, hoisting and welding another side span of the steel plate composite beam on site, welding the bridge deck, laying the bridge deck pavement, and installing the auxiliary facilities.

[0015] Beneficial effect: By adopting top-pushing construction, necessary temporary piers are set up on the side span during top-pushing, and the main beams on both sides of the side span are temporarily consolidated with the main beams of the main span. The main beams of the side span are used as guide beams for top-pushing to reduce construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0017] Figure 1 A perspective view of an embodiment;

[0018] Figure 2 is a top view of the main bridge of the embodiment;

[0019] Figure 3 It is a front view of the main bridge of the embodiment;

[0020] Figure 4 is a side sectional view of an embodiment;

[0021] Figure 5 It is a structural schematic diagram of the upper flat link of the embodiment;

[0022] Figure 6 It is a structural schematic diagram of the inner side transverse piece of the embodiment;

[0023] Figure 7 A schematic diagram of the structure of the outer truss of the embodiment;

[0024] Figure 8 A schematic structural diagram of a curved bridge gantry according to an embodiment;

[0025] Fig. 9 A schematic diagram of the state of implementing step 1;

[0026] Fig.10 A schematic diagram of the state of implementing step 2;

[0027] Fig.11 A schematic diagram of the state of implementing step 3;

[0028] Fig.12 A schematic diagram of the state of implementing step 4;

[0029] 1-first upper chord, 2-second upper chord, 3-first web member, 4-second web member, 5-upper horizontal web member, 6-portal lower chord, 7-portal web member, 8-main beam, 9-cross beam, 10-longitudinal beam, 11-bridge deck, 12-main pier. DETAILED DESCRIPTION

[0030] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0031] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and 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 orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0033] Reference Figures 1 to 8 The plate-truss composite system landscape bridge is mainly composed of a truss, a bridge deck system, a main pier 12 and an arc-shaped bridge portal frame. The truss includes an inner truss, an outer truss and an upper flat joint. The inner truss, the outer truss and the upper flat joint are all Warren trusses. The three plane-stable Warren trusses form a stable triangle in space by sharing a chord rod, which greatly increases the out-of-plane stiffness of the main truss. The overall structural stiffness is large and the wind and earthquake resistance is good. Specifically, the upper flat joint is a horizontal Warren truss, the inner truss is a plumb Warren truss, and the outer truss is an outward-inclined curved Warren truss. The structure is regular, the form is novel, the shape is beautiful, and the landscape effect is good.

[0034] Specifically, the inner truss piece includes a first upper chord 1, a first lower chord and a first web 3, and the outer truss piece includes a second upper chord 2, a second lower chord and a second web 4, wherein the first lower chord and the second lower chord are common components, and an upper flat web 5 is provided between the first upper chord 1 and the second upper chord 2. The first web 3 and the second web 4 are arranged in a staggered manner, so that the landscape bridge structure is more stable and the field of vision on the landscape bridge is increased. The upper flat joint can be a separate component, which is welded by two rods and the upper flat web 5, and finally welded between the first upper chord 1 and the second upper chord 2, or the upper flat web 5 can be directly welded between the first upper chord 1 and the second upper chord 2. Preferably, the inner truss piece and the outer truss piece are welded.

[0035] Specifically, the trusses on both sides of the landscape bridge body are connected through an arc-shaped bridge portal, wherein the first upper chord 1 and the second upper chord 2 are curved rods with a high middle and low sides, and the trusses on both sides of the landscape bridge body are connected to form a cradle-shaped Warren truss, making the trusses of the landscape bridge body more beautiful and more novel in structure. Preferably, the arc-shaped bridge portal and the truss are welded.

[0036] Specifically, the arc-shaped gantry includes a gantry upper chord, which is an inner and outer arc-shaped rod. The inner gantry upper chord is connected to the first upper chord 1 on the left and right sides of the landscape bridge body, and the outer gantry upper chord is connected to the second upper chord 2 on the left and right sides of the landscape bridge body. A gantry lower chord 6 is correspondingly arranged below the gantry upper chord, and the size of the gantry lower chord 6 is smaller than the gantry upper chord. The ends of the gantry lower chord 6 are connected to the first web bar 3 and the second web bar 4 located at the bridge head and the bridge tail, and a reinforcing web bar is arranged between the ends of the gantry lower chord, and a reinforcing web bar is arranged at the end joint point of the first upper chord and the second upper chord. The gantry upper chord and the gantry lower chord 6 are staggeredly connected by the gantry web bar 7, and a triangular structure is formed between the gantry web bar 7 and the gantry upper chord and the gantry lower chord 6. The stability of the truss is enhanced, and the wind and earthquake resistance performance is improved.

[0037] Specifically, a mid-span top frame is arranged between the first upper chords 1 on both sides of the landscape bridge body, and the mid-span top frame is located in the middle of the landscape bridge body, and the mid-span top frame protrudes upward. Preferably, the mid-span top frame includes six arc-shaped rods, and three arc-shaped rods are arranged on the left and right sides of the landscape bridge body, respectively. One end of the arc-shaped rod is connected to the first upper chord 1, and the other end is gathered at a point in the center of the bridge deck to form a dome structure, and landscape is added at the dome structure, so that the top of the landscape bridge body has a logo, which increases the aesthetics.

[0038] Specifically, the plate-truss composite landscape bridge also includes a bridge deck system, which includes a main beam 8, a cross beam 9, a longitudinal beam 10 and a bridge deck 11. The main beam 8 is located on both sides of the bridge and is a common component with the first lower chord and the second lower chord. The cross beam 9 is used to connect the main beams 8 on both sides and is arranged at the intersection of the web member and the main beam 8 in the truss. The longitudinal beam 10 is arranged between the main beams 8 to transfer the bridge deck load to the cross beam 9. The bridge deck 11 is arranged between the main beams 8.

[0039] Preferably, in order to increase the landscape effect, the first upper chord 1, the second upper chord 2 and the main beam 8 are all set to chamfered box sections or large-diameter circular sections, and the upper horizontal link, the first web member 3, the second web member 4, the upper horizontal web member 5 and the bridge portal web member 7 are set to small-diameter circular sections.

[0040] Specifically, the plate-truss composite system landscape bridge further includes a main pier 12, which is arranged below the main beam 8. Preferably, the main pier 12 is of concrete structure and is arranged in A-shape, and includes pier legs, cross columns and tie beams, the pier legs are provided with a support at the top, the cross columns are used to connect the pier legs on both sides of the landscape bridge body, and the tie beam is located below the pier legs and its shape is set to an inwardly concave arc, so that its side view shows a cradle base.

[0041] The span with the largest span is called the main span, and the span with the smaller span is called the side span. Preferably, the plate-truss composite system landscape bridge includes a main span and a side span, the truss is arranged on the main span, and the side span is only provided with the bridge deck system to reduce the negative bending moment above the main pier 12, so that the landscape bridge can span a longer distance. The side span bridge deck system is discontinuous with the bridge deck system of the main span and an expansion joint is arranged, and the side span and the main span form a simply supported structure, which is convenient for the construction and installation of the landscape bridge.

[0042] Preferably, the bridge deck 11 is entirely or partially made of high-strength glass to enhance the landscape effect of the landscape bridge.

[0043] Reference Figures 9 to 12 The main bridge is constructed by top-pushing, and the construction method of the plate-truss composite system landscape bridge is divided into four steps.

[0044] Step 1: Set up a construction platform and steel cofferdam to complete the construction of the main pier 12 and temporary piers.

[0045] Step 2: Splice the side span steel plate composite beam on site as the guide beam, and weld and splice the main span Warren steel truss on site behind the guide beam.

[0046] Step 3: Push the guide beam and main span to the designed position.

[0047] Step 4: After the jacking is completed, the temporary pier is removed, and the side span of another steel plate composite beam is hoisted and welded on site, the bridge deck 11 is welded, the bridge deck pavement is laid, and the ancillary facilities are installed.

[0048] Specifically, in terms of construction methods, we can comprehensively consider factors such as site conditions, transportation conditions, and traffic conditions under the bridge, and choose a variety of construction methods such as jacking, hoisting and suspension assembly, and full-bridge support.

[0049] Reference Figure 1 The bridge is a pedestrian bridge across the river in a certain city. Its main function is to connect a small island in the river with Binjiang Road for pedestrians to cross the river. The span of the bridge is arranged as 2×40+168+2×40m. The main span adopts a 168m cradle-shaped Warren steel truss simply supported beam bridge to cross the waterway under the bridge. Both sides of the main span are equipped with 2×40m simply supported steel plate beams to connect Binjiang Road and a small island respectively. Two main trusses are arranged horizontally. The main truss has a truss height of 10.5m in the middle of the span and a fulcrum truss height of 20.5m. The horizontal center distance between the two main trusses is 18m. Each main truss consists of three Warren trusses. A crossbeam 9 is arranged every 6m between the two main trusses. An orthogonal anisotropic bridge deck is installed on the crossbeam 9. The designed bridge deck width is 2m (width of the lower chord of the main truss) + 16m (clear width of passage) + 2m (width of the lower chord of the main truss) = 20m.

[0050] The first upper chord 1, the second upper chord 2, the main beam 8, the upper chord of the portal frame, and the lower chord 6 of the main bridge adopt box sections. Since the first upper chord 1 and the second upper chord 2 are compression rods, stiffening ribs are set in the box to ensure local stability; the upper flat web 5 and the web 7 of the portal frame adopt I-sections; the first web 3 and the second web 4 adopt box sections or I-sections, among which the rods in the range close to the support point adopt box sections, and the rods in the mid-span range adopt I-sections. The first upper chord 1, the second upper chord 2, the main beam 8, the upper chord of the portal frame, and the lower chord 6 of the portal frame adopt Q500qENH steel. The first upper chord 1, the second upper chord 2, the upper chord of the portal frame, and the lower chord 6 of the portal frame are 1000mm high, 1000mm wide, and 36-50mm thick. The main beam 8 is 2000mm high, 2000mm wide, and 28-50mm thick. The bridge adopts an integral fully welded node, that is, each section of the upper chord and the main beam 8 is a prefabricated node. The length of each section of the first upper chord 1 and the second upper chord 2 is 12002-12292mm, and the length of each section of the main beam 8 is 6000mm. The upper horizontal web 5 and the bridge portal web 7 are made of Q420qE steel, box-shaped section, 500mm high, 500mm wide, 28mm thick, and the length of the rod is 5909mm-10095mm. The first web 3 and the second web 4 are made of Q420qE steel, box-shaped section or I-shaped section, 500mm high, 800mm wide, 28-48mm thick, and the length of the rod is 10000mm-20591mm. The compression plates of the first upper chord 1 and the second upper chord 2 box-section members are all provided with 20mm thick stiffening ribs. A cross beam 9 is provided every 6000m between the two main trusses in the longitudinal direction, with a box section, a height of 2000mm, a width of 1000mm, and a thickness of 32mm. The longitudinal beam 10 is an H-section, with a height of 1000mm, a width of 800mm, and a thickness of 32mm. The bridge deck 11 adopts an orthotropic bridge deck, an L-shaped stiffening rib, and Q370qE steel. The thickness of the bridge deck 11 is 16mm. The bridge deck is paved with 5.5cm epoxy asphalt concrete.

[0051] The main pier 12 is a portal pier, with a rectangular section and a pile group foundation. It uses drilled or punched cast-in-place piles with a pile diameter of 2m. The top surface of the cap is set to a curved surface, imitating the bent leg structure of a cradle. The side pier is a column pier, with a rectangular section and a pile group foundation. It uses drilled or punched cast-in-place piles with a pile diameter of 1.5m. The thickness of the cap varies according to the pile diameter. The minimum thickness of the pile cap of the main pier 12 with a diameter of 2.0m is 3.945m, and the thickness of the pile cap of the side pier with a diameter of 1.5m is 2.5m. The pile foundation uses bored cast-in-place piles or punched cast-in-place piles, with diameters of 1.5m and 2.0m. The bearing capacity of a single pile is 9000kN and 15000kN respectively, and the average pile length is about 40m.

[0052] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in this technical field without departing from the purpose of the present invention.

Claims

1. A plate-truss combined system landscape bridge, characterized by: It includes a pair of trusses, which are symmetrically arranged on the left and right sides of the landscape bridge body, and the trusses include inner truss pieces, outer truss pieces and upper flat joints; The inner truss comprises a first upper chord, a first lower chord and a first web member; The outer truss comprises a second upper chord, a second lower chord and a second web member; The first lower chord and the second lower chord are a common component; An upper flat web bar is provided between the first upper chord bar and the second upper chord bar, and the first upper chord bar, the second upper chord bar and the upper flat web bar constitute an upper flat joint; The first web member, the second web member and the upper horizontal web member are arranged in a Warren truss structure, and the first web member and the second web member are arranged alternately; Wherein, the inner truss piece is arranged vertically, and the outer truss piece is arranged to be inclined outwards; The plate-truss combined system landscape bridge also includes an arc-shaped bridge portal, which is located at both ends of the truss. A pair of the trusses are connected by the arc-shaped bridge portal, and the first upper chord and the second upper chord are curved rods with a lower middle and higher ends; The arc-shaped gantry includes a gantry upper chord, a gantry lower chord is arranged below the gantry upper chord, the ends of the gantry lower chord are connected with the end webs of the inner truss and the outer truss, a reinforcing web is arranged between the ends of the gantry lower chord, a reinforcing web is arranged at the end joint of the first upper chord and the second upper chord, and the gantry upper chord and the gantry lower chord are staggeredly connected by gantry webs; The plate-truss combined system landscape bridge also includes a bridge deck system, which includes a main beam, a cross beam, a longitudinal beam and a bridge deck. The main beams are located on both sides of the landscape bridge body and are common components with the first lower chord and the second lower chord. The cross beams are used to connect the main beams on both sides and are arranged at the intersection of the first web member and the second web member in the truss and the main beam; the longitudinal beams are arranged between the main beams, and the bridge deck is arranged between the main beams.

2. The plate-truss composite landscape bridge according to claim 1 is characterized in that: A mid-span top frame is arranged between the first upper chords on both sides of the landscape bridge body. The mid-span top frame is located in the middle of the landscape bridge body and protrudes upward.

3. The plate-truss combined system landscape bridge according to claim 1 is characterized by: The plate-truss combined system landscape bridge also includes a main pier, which includes pier legs and cross columns. The pier legs are provided with supports at the top, and the cross columns are used to connect the pier legs on both sides of the landscape bridge body.

4. The plate-truss combined system landscape bridge according to claim 1 is characterized in that: The plate-truss combined system landscape bridge comprises a main span and a side span, wherein the truss is arranged on the main span, and the side span is only provided with the bridge deck system, the bridge deck system of the side span is discontinuous with the bridge deck system of the main span and an expansion joint is arranged, and the side span and the main span form a simply supported structure.

5. The plate-truss composite landscape bridge according to claim 1 is characterized in that: The bridge deck is entirely or partially provided with high-strength glass.

6. A construction method of a plate-truss composite system landscape bridge according to any one of claims 1 to 5, characterized in that: The main bridge is constructed by top-pushing, and the method and steps of the top-pushing construction are as follows: Step 1: Set up a construction platform and steel cofferdam to complete the construction of the main pier and temporary pier; Step 2: Splice the side span steel plate composite beam on site as the guide beam, and weld and splice the main span Warren steel truss on site behind the guide beam; Step 3: Push the guide beam and main span to the designed position; Step 4: After the jacking is completed, the temporary piers are removed, and the other steel plate composite beam side span is hoisted and welded on site, the bridge deck is welded, the bridge deck pavement is laid, and ancillary facilities are installed.

Images