CN213389674U - Light pedestrian overpass system combining cold-formed thin-walled steel and straw plates - Google Patents
Light pedestrian overpass system combining cold-formed thin-walled steel and straw plates Download PDFInfo
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- CN213389674U CN213389674U CN202020974508.2U CN202020974508U CN213389674U CN 213389674 U CN213389674 U CN 213389674U CN 202020974508 U CN202020974508 U CN 202020974508U CN 213389674 U CN213389674 U CN 213389674U
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Abstract
The utility model discloses a light pedestrian bridge system combining cold-formed thin-wall section steel and straw plates, which comprises a handrail truss, a footpath frame and a bearing connecting piece; the handrail truss is connected with the two sides of the footpath frame through high-strength bolts; the handrail truss comprises a first chord member and a plurality of first web members, the first chord member comprises a first upper chord member and a first lower chord member parallel to the first upper chord member, and the first web members are arranged between the first upper chord member and the first lower chord member at intervals; the walkway frame comprises a second chord and a plurality of second web members; the second chord comprises a second upper chord and a second lower chord parallel to the second upper chord, and a plurality of second web members are arranged between the second upper chord and the second lower chord at intervals to form a walkway frame unit; a unit footpath steel frame for fixing the straw plate frame is arranged in the footpath frame unit, and the compressed straw plate is filled in the straw plate frame.
Description
Technical Field
The utility model belongs to the technical field of the building, a light-duty pedestrian bridge system of combination cold-formed thin-walled steel and straw board is related to.
Background
Modern pedestrian bridges are developed towards the trend of new structures, new materials and new technologies, are lighter in weight, are easier to shape urban landscapes, and have a shorter construction period as a new pursuit of urban pedestrian overbridge (zhahao, chenyuanling, liu le hai. The existing passenger foot bridge mainly comprises a concrete-structured passenger foot bridge and a steel box girder-structured passenger foot bridge, and mainly has the following defects and shortcomings:
1. the steel box girder pedestrian overpass relies on the steel box girder to provide bending resistance, so that the girder height is forced to be improved along with the increase of design load (Shenyang fan, Qi Ming, Yang bin, Wanshao Quanji. mechanical properties of the steel box girder and the steel truss pedestrian overpass are contrasted and analyzed [ J ]. Shanxi building, 2015:4.), and the actual quality of engineering is difficult to control due to the existence of a large amount of field welding operation;
2. the concrete-structured pedestrian overpass is heavy in structure and long in construction period (Zhao spar. Reactive Powder Concrete (RPC) pedestrian overpass channel beam structure optimization design and stability research [ D ]. Beijing university of transportation, 2007.), and along with the promotion of urban construction, the problem of subsequent treatment of the waste concrete-structured overpass becomes a difficult problem in urban construction;
in recent years, the application of light materials in the field of house construction is becoming mature, but the practical application in the field of bridges is increasing, and the application of new materials is over emphasized, and the disadvantages are brought:
1. because the application specification of new materials such as aluminum alloy in the field of the pedestrian bridge is insufficient, the actual engineering cannot obtain accurate design and construction guide;
2. the elastic modulus of new materials such as aluminum alloy is only 1/3 (characteristics of Shenfejun aluminum alloy pedestrian overpass and application [ R ] Ningbo passage investment development Limited company, 2014:7.) of traditional steel, the structure is flexible, and the structure deflection is generally found to be close to the deflection limitation in the specification in the research of the aluminum alloy pedestrian overpass, so that the development of the aluminum alloy pedestrian overpass to a larger span and a larger width is further limited;
3. the over-light weight leads to that the nominal total fundamental frequency of the bridge is easy to obviously reduce along with the increase of the number of the pedestrians,
causing unpredictable human bridge resonance problems.
Meanwhile, in order to improve the condition that the traditional wood structure uses a large amount of wood but fails to give full play to the performance of the wood, and comply with the trend of protecting the environment and saving resources, a steel-wood composite structure which takes steel as a main frame and is filled with wood plates is applied to a steel structure house system and mainly plays the roles of bearing and enclosing in the structure.
Under the background, the combined structure with light steel as a frame and straw plates as filling plates is subjected to a bending resistance test, and the steel structure frame is subjected to a test and software analysis. The combined light pedestrian bridge system combines hot rolled steel and cold-formed thin-walled steel as vertical rigidity providing components and is paved with straw plates with good bending resistance.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the not enough of above-mentioned prior art, provide a construction of being convenient for, make full use of material, green, the light-duty pedestrian bridge system of combination that comprehensive mechanical properties is excellent.
The utility model discloses at least, one of following technical scheme realizes.
A light pedestrian bridge system combining cold-formed thin-wall section steel and straw plates comprises an armrest truss, a footpath frame and a bearing connecting piece; the handrail truss is connected with the footpath frame through a high-strength bolt;
the handrail truss comprises a first chord member and a plurality of first web members, the first chord member comprises a first upper chord member and a first lower chord member parallel to the first upper chord member, and the plurality of first web members are arranged between the first upper chord member and the first lower chord member at intervals and are vertical to the first upper chord member;
the walkway frame comprises a second chord and a plurality of second web members; the second chord comprises a second upper chord and a second lower chord parallel to the second upper chord, and a plurality of second web members are arranged between the second upper chord and the second lower chord at intervals and are vertical to the second upper chord to form a footpath frame unit; a unit footpath steel frame for fixing the straw plate frame is arranged in the footpath frame unit, and the compressed straw plate is filled in the straw plate frame. Furthermore, the handrail truss and the footpath frame are made of hot-rolled channel steel or cold-formed thin-walled C-shaped steel, and the bearing connecting piece is made of hot-rolled angle steel.
Further, Lc meters in the first chord span are provided with first inclined struts, and each Lh meter in the side span is provided with a second inclined strut.
Furthermore, the first diagonal brace mainly comprises diagonal web members and a gusset plate, holes are formed in web plates and flange positions at the edges of the diagonal web members, each diagonal web member forms a pair of cross support rods, the gusset plate fixes the four diagonal web members through high-strength bolts, and the diagonal web members are connected with the handrail truss through the high-strength bolts.
Furthermore, the second diagonal brace comprises a second diagonal web member and a third diagonal web member, two opposite sides of the third diagonal web member are grooved, the second diagonal web member comprises two sections of hot rolled channel steel, and the two sections of hot rolled channel steel are welded at the grooving positions of the third diagonal web member through fillet welds respectively.
Furthermore, the second web members are made of double channel steel, so that the straw plate frames can be inserted into the frame units of the footpath, and the channel steel flanges of the steel frames of the unit footpath are provided with reserved holes.
Furthermore, the straw board frame comprises more than two transverse wood boards and more than two longitudinal wood boards, the longitudinal wood boards are perpendicular to the transverse wood boards to form a square frame, and crossed diagonal steel belts are arranged in the square frame and used for reinforcing the straw board frame.
Further, the straw board is fixed on the straw board frame through a steel belt.
Further, the compressed straw board is subjected to corrosion prevention and fire prevention treatment.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the traditional pedestrian bridge generally adopts the mode of increasing the height of a steel box girder and improving the thickness of concrete plate to realize the integral lifting of the vertical rigidity of the structure. But the weight and the manufacturing cost of the structure are obviously improved, and certain visual depression is caused. The pedestrian overpass is light in weight, and adopts handrails as main bending-resistant components of the structure and a truss system. The force transmission mode is set to directly bear the pedestrian load by the footpath, and the footpath is connected with the handrails on the two sides by bolts, so that the beam height is effectively reduced compared with a steel box girder bridge, and the whole structure is simple and attractive;
2. according to the truss bridge system, hot-rolled common steel and cold-formed thin-walled steel are combined in the selection of the web members, according to the structural optimization, the side span part adopts the part with thicker wall thickness and adopts the hot-rolled steel member with larger section, and the midspan adopts the cold-formed thin-walled steel member with thinner wall thickness as the web members. On the premise of ensuring the bending resistance of the bridge body, the self weight of the bridge is effectively reduced, and the minimum steel amount of the bridge can reach 50kg/m when the size and the proportion of the rod pieces are determined according to different specific design requirements through statistics2；
3. The upper chord member and the lower chord member of the handrail truss are made of hot rolled common steel, in the mode of connecting the chord members with the web members, the two ends of the web members are embedded into the grooves of the chord members to realize direct hinging through high-strength bolt connection, the shape characteristic of channel steel is exerted, compared with the mode of constructing the truss by adopting the gusset plates, the use amount of the gusset plates and bolts is saved, meanwhile, the cutting and welding in the construction of the gusset plates are avoided, and the construction efficiency and the construction quality are improved;
4. the method is characterized in that a steel frame is combined with a straw plate to serve as a walkway plate, a hot-rolled double-channel steel is adopted as a frame web member of the walkway frame, bolt holes are reserved in the flange of the channel steel, straw treatment materials subjected to fireproof and moistureproof treatment are filled in the walkway plate, an internal wood frame formed by longitudinal beams and cross beams is filled in the wood plate to serve as a stress member, and skin wood plates are covered on two sides of the wood frame, so that sufficient structural strength can be achieved while the wood consumption is reduced;
5. the whole structure is manufactured into prefabricated components in a factory and then transported to a construction site for assembly, so that the on-site construction difficulty and the on-site construction uncertainty are effectively reduced, the installation difficulty is low, the assembled requirement is met, the construction is safe, and the economical efficiency is good.
Drawings
FIG. 1 is a three-dimensional schematic view of a light pedestrian bridge system of the present embodiment combining cold-formed thin-walled steel and straw plates;
FIG. 2 is a cross-sectional view of a light pedestrian bridge system of the combined thin-walled cold-formed steel and straw board of the present embodiment;
FIG. 3a is a schematic view of a hot rolled channel steel of type C140 x60x 8/9.5;
FIG. 3b is a schematic view of a cold-formed thin-walled C-shaped steel type CC-J120 x50x17x 2;
FIG. 3c is a schematic view of L70 x8 hot rolled angle steel;
FIG. 4 is a cross-sectional view of a non-braced handrail frame formed of hot rolled steel channels according to the present embodiment;
FIG. 5 shows a handrail portion of the present embodiment incorporating a hot rolled channel;
FIG. 6 shows a handrail portion of the present embodiment formed by assembling cold-formed thin-walled steel sections;
FIG. 7 is a schematic view of the framework of the footpath of the present embodiment;
FIG. 8 is a schematic view of the cross-node connection of the cold-formed thin-walled steel of the present embodiment;
FIG. 9 is a schematic view of a cross-node connection of the hot rolled steel channels according to the embodiment;
FIG. 10 is a schematic view of an opening of the frame of the unit walkway according to the embodiment;
FIG. 11 is a frame diagram of the straw board according to the embodiment;
FIG. 12 is a view of the straw board filling and side span in the present embodiment;
wherein: 1-handrail truss, 2-footpath frame, 3-bearing connecting piece, 4-first chord member, 5-first web member, 6-first diagonal brace, 7-second diagonal brace, 8-second chord member, 9-second web member, 10-first diagonal web member, 11-gusset plate, 12-second diagonal web member and 13-third diagonal web member.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, which are not repeated herein, but the applicability of the present invention is not limited to the following embodiments.
As shown in fig. 1 and 2, a light pedestrian bridge system combining cold-formed thin-walled steel and straw plates comprises a handrail truss 1, a footpath frame 2 and a bearing connecting piece 3; handrail truss 1 is connected with pavement frame 2 both sides through high strength bolt, and bearing connecting piece 3 is connected with handrail truss 1 and pavement frame 2 respectively, and bearing connecting piece 3 cross-section is equilateral angle steel, and bearing connecting piece 3 two limbs pass through 8.8 level M14 high strength bolt and are connected with first bracing in handrail truss 1, second bracing flange and pavement frame second chord member flange respectively, as the measure of improving node joint strength.
The embodiment is based on a pedestrian overpass actual project with a span L of 30m and a bridge width W of 3m, wherein the handrail truss 1 is a main bending-resistant member, the height of the handrail truss 1 is 1.8m in this example, the elevation of the pavement frame 2 is 0.3m away from the elevation of the first chord member of the handrail truss 1, concrete columns or steel columns with a distance of 30m are adopted as boundaries in the actual project, and the supports are arranged at two ends of the overpass and are of a simple support structure. Only the construction of the foundation and the two side column structures is carried out on site, and the main body structure is prefabricated in a factory and installed on site.
As shown in fig. 2, the width W of the walkway frame 2 is 3m, the walkway frame 2 and the handrail truss 1 are made of C140 x60x8/9.5 hot rolled channel steel or CC-J120 x50x17x2 cold-formed thin-walled C-shaped steel, and the supporting connecting member 3 is made of L70 x8 hot rolled angle steel.
FIG. 3a is C140 x60x8/9.5 hot rolled channel steel, FIG. 3b is CC-J120 x50x17x2 cold-formed thin-walled C steel, and FIG. 3C is L70 x8 hot rolled angle steel.
The handrail truss 1 comprises a first chord member 4 and a plurality of first web members 5, and the first chord member 4 and the first web members 5 are both hot-rolled channel steel; first chord 4 includes first chord and the first chord down parallel with first chord, and first chord channel-section steel opening is downward, and first chord channel-section steel opening is upwards, and in the opening of first chord and first chord down, first web member 5 both ends embedding, first web member 5 is through 8.8 grades of M14 high strength bolt spaced setting between first chord and first chord down.
As shown in fig. 4, the lengths of the first upper chord and the first lower chord of this embodiment are both 30 meters, the distance Le between the adjacent first web members 5 is 3 meters, and 11 first web members 5 are provided.
As shown in fig. 5, the first chord 4 is provided with a first brace 6 across an area Lc of 12 m.
As shown in fig. 8, the first diagonal brace 6 is made of cold-formed thin-walled steel, the first diagonal brace 6 mainly comprises diagonal web members 10 and gusset plates 11, each 4 diagonal web members 10 form a pair of cross support rods, holes are formed in web plates and flange positions at the edges of the diagonal web members 10, and the gusset plates 11 fix the 4 diagonal web members 10 through high-strength bolts. The two ends of the diagonal web member 10 are respectively embedded into the flange grooves of the first upper chord member and the first lower chord member, and the diagonal web member 10 is connected with the handrail truss 1 through a high-strength bolt.
The gusset plate 11 is 2mm thick, and the web is 80mm wide, can just be nested oblique web member 10 in the recess, and gusset plate and oblique web member flange position set up the preformed hole to supply 8.8 grades of M14 high strength bolt connection gusset plate and oblique web member 10, realize the cross design of two-way oblique web member 10.
As shown in fig. 6, a second inclined strut 7 is provided in the range of 9m of the first chord 4; as shown in fig. 9, the second diagonal brace 7 includes a second diagonal web member 12 and a third diagonal web member 13, opposite sides of the third diagonal web member 13 are grooved, the second diagonal web member 12 includes two sections of hot rolled channel steel, and the two sections of hot rolled channel steel are welded at the grooved position of the third diagonal web member 13 by fillet welding respectively. Four corners of the second inclined strut 7 are embedded into the first upper chord and the first lower chord and connected with flanges of the first upper chord and the first lower chord through 8.8-grade M14 high-strength bolts.
The walkway frame 2 comprises a second chord 8 and a number of second web members 9; the second chord member 8 comprises a second upper chord member and a second lower chord member parallel to the second upper chord member, the second chord member 8 and the second web members 9 are hot-rolled channel steel, and the second web members 9 are double-channel steel so as to be filled with straw plates before the frame is packaged. The channel steel openings of the second upper chord and the second lower chord are opposite, two ends of the second web member 9 are embedded into the openings of the second upper chord and the second lower chord to form a plurality of walkway frame units, and the second web member 9 is connected with the second chord 8 through high-strength bolts;
as shown in fig. 7, in this embodiment, the lengths of the second upper chord and the second lower chord are both 30 meters, the distance Le between the adjacent second web members 9 is 3 meters, and a total of 11 second web members 9 are provided.
As shown in fig. 10, the inside of the walkway frame unit can be divided into a plurality of unit walkway steel frames which are distributed at equal intervals, the width W of each unit walkway steel frame is 3M, the length Le is 3M, the second web members in the unit walkway steel frames adopt double channel steel, the double channel steel is obtained by connecting two channel steel at a web plate position through 8.8-level M14 high-strength bolts, so that the straw plate frame is inserted into each walkway frame unit, the channel steel flanges of the unit walkway steel frames are provided with reserved holes 14, and the hole diameter is 15 mm.
As shown in FIG. 11, the straw board frame is the same size as the unit footpath steel frame, and the length and width of the straw board frame are both 3 meters. The straw board frame comprises transverse wood boards 15 and longitudinal wood boards 16, and each pavement steel frame is provided with 1 straw board frame. In this example. The straw board frame comprises 3 transverse wood boards 15 and 3 longitudinal wood boards 16, the 3 longitudinal wood boards 16 are perpendicular to the 3 parallel transverse wood boards 15 to form four square frames, and the length Lew of each transverse wood board 15 and the length Ww of each longitudinal wood board 16 are both 3 m. The transverse wood boards 15 are arranged in parallel with the second chord members 8, the longitudinal wood boards 16 are arranged in parallel with the second web members 9, crossed oblique-pulling steel belts 17 are arranged in each square frame, and the oblique-pulling steel belts 17 are 100mm wide and 4.5mm thick.
As shown in figure 12, the straw board frame is filled with compressed straw boards 18 which are subjected to corrosion and fire prevention treatment, the edges of the straw boards 18 are enveloped and fixed by thin steel belts 19 which are 2mm thick and 10mm wide, and after the compressed straw boards 18 are inserted into the unit footpath steel frame, the straw boards 18 are fixed by self-tapping screws through the thin steel belts 19 and the reserved holes 14.
In actual construction, the concrete steps are as follows:
1. firstly, embedding a plurality of first web members 5 into grooves of a first upper chord member and a first lower chord member, and bolting by high-strength bolts;
2. fixing an inclined web member 10 by using a gusset plate 11 to form a first inclined strut 6, installing the first inclined strut 6 in the middle of the first chord 4 by 12m, respectively embedding the first inclined strut 6 into flange grooves of the first upper chord and the first lower chord, and fixing the first inclined strut 6 by using a high-strength bolt; a second inclined strut 7 is arranged on each side span by 9 meters;
3. firstly assembling a transverse wood board 15 and a longitudinal wood board 16, reinforcing by adopting an inclined steel belt 17 to complete a straw board frame, further filling a compressed straw board 18, and fixing the straw board 18 by using self-tapping screws through a thin steel belt 19 and a preformed hole 14;
4. and (3) embedding a plurality of second web members 9 into the openings of the second upper chords, bolting the web members by using high-strength bolts, inserting the web members into the straw board frame in the step (3), and connecting the web members with the second lower chords.
5. The bearing connecting piece 3 is connected in a bolting mode at the position of 300mm between the handrail truss 1 and the lower chord web of the handrail truss 1, then the handrail trusses 1 on the two sides are vertically fixed at the distance of 3000mm, the chord web of the footpath frame 2 is bolted with the flange of the handrail truss 1, and meanwhile, the flange of the web of the footpath frame 2 is bolted with the bearing connecting piece 3.
In this embodiment, this light-duty pedestrian bridge body of combination thin-walled cold-formed steel and straw board is under the prerequisite of guaranteeing structural mechanics performance, through the compound cross application of hot rolled steel and cold-formed steel to fill the straw board in the pavement frame, effectively reduced the steel consumption of pedestrian bridge system, stable in structure simultaneously, it is convenient to construct, accords with the overall requirement of assembled.
The above embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (9)
1. A light pedestrian bridge system combining cold-formed thin-wall section steel and straw plates is characterized by comprising an armrest truss (1), a footpath frame (2) and a bearing connecting piece (3); the handrail truss (1) is connected with the footpath frame (2) through high-strength bolts;
the handrail truss (1) comprises a first chord member (4) and a plurality of first web members (5), the first chord member (4) comprises a first upper chord member and a first lower chord member parallel to the first upper chord member, and the first web members (5) are arranged between the first upper chord member and the first lower chord member at intervals and are vertical to the first upper chord member;
the walkway frame (2) comprises a second chord (8) and a plurality of second web members (9); the second chord (8) comprises a second upper chord and a second lower chord parallel to the second upper chord, and a plurality of second web members (9) are arranged between the second upper chord and the second lower chord at intervals and are vertical to the second upper chord to form a walkway frame unit; a unit footpath steel frame for fixing the straw plate frame is arranged in the footpath frame unit, and the compressed straw plate (18) is filled in the straw plate frame.
2. The light pedestrian bridge system combining cold-formed thin-walled steel and straw boards as claimed in claim 1, wherein the handrail truss (1) and the walkway frame (2) are made of hot-rolled channel steel or cold-formed thin-walled C-shaped steel, and the supporting connecting member (3) is made of hot-rolled angle steel.
3. The light pedestrian bridge system combining the cold-formed thin-walled steel sections and the straw boards as claimed in claim 1, wherein the first chord (4) is provided with a first inclined strut (6) at Lc meters across the middle, and a second inclined strut (7) at each Lh meter across the side.
4. The light pedestrian bridge system combining the cold-formed thin-wall section steel and the straw plate as claimed in claim 3, wherein the first diagonal brace (6) mainly comprises diagonal web members (10) and gusset plates (11), holes are formed in web plates and flange positions at the edges of the diagonal web members (10), every 4 diagonal web members (10) form a pair of cross support rods, the gusset plates (11) fix the 4 diagonal web members (10) through high-strength bolts, and the diagonal web members (10) are connected with the handrail truss (1) through the high-strength bolts.
5. The light pedestrian bridge system combining the cold-formed thin-wall steel and the straw plate as claimed in claim 3, wherein the second diagonal brace (7) comprises a second diagonal web member (12) and a third diagonal web member (13), opposite sides of the third diagonal web member (13) are grooved, the second diagonal web member (12) comprises two sections of hot-rolled steel channels, and the two sections of hot-rolled steel channels are welded at the grooved positions of the third diagonal web member (13) respectively by fillet welds.
6. The light pedestrian bridge system combining cold-formed thin-walled steel sections and straw boards as claimed in claim 1, wherein the second web members (9) are double channel steel sections so that the straw board frames are inserted into the walkway frame units, and the channel steel flanges of the unit walkway steel frames are provided with the prepared holes (14).
7. The light pedestrian bridge system combining cold-formed thin-walled steel sections and straw boards as claimed in claim 1, wherein the straw board frame comprises more than two transverse boards (15) and more than two longitudinal boards (16), the longitudinal boards are perpendicular to the transverse boards to form a square frame, and crossed cable-stayed steel belts (17) are arranged in the square frame to reinforce the straw board frame.
8. The light pedestrian overpass system combining cold-formed thin-walled steel sections and straw boards as claimed in claim 7, wherein the straw board (18) is fixed on the straw board frame by a steel belt (19).
9. The light pedestrian bridge system combining cold-formed thin-walled steel and straw boards as claimed in claim 1, wherein the compressed straw board (18) is treated with corrosion and fire prevention.
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| CN202020974508.2U CN213389674U (en) | 2020-05-31 | 2020-05-31 | Light pedestrian overpass system combining cold-formed thin-walled steel and straw plates |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113652953A (en) * | 2021-09-01 | 2021-11-16 | 福州轨道交通设计院有限公司 | Novel assembled overline bridge ramp |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113652953A (en) * | 2021-09-01 | 2021-11-16 | 福州轨道交通设计院有限公司 | Novel assembled overline bridge ramp |
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Granted publication date: 20210608 |