CN217781780U - A old bridge load sharing amplitude reduction device for piecing together wide bridge - Google Patents
A old bridge load sharing amplitude reduction device for piecing together wide bridge Download PDFInfo
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- CN217781780U CN217781780U CN202220623974.5U CN202220623974U CN217781780U CN 217781780 U CN217781780 U CN 217781780U CN 202220623974 U CN202220623974 U CN 202220623974U CN 217781780 U CN217781780 U CN 217781780U
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Abstract
The utility model relates to an old bridge load sharing subtracts width device for piecing together wide bridge, the setting is on piecing together wide bridge, piece together wide bridge contains piece together wide bridge superstructure and locates the piece together wide bridge pier that pieces together wide bridge superstructure both ends in pairs, the load sharing subtracts width device includes load sharing subtracts width device main bridge part and mated load sharing subtracts width device approach bridge part, load sharing subtracts width device main bridge part level sets up, contain the main bridge crossbeam, the main bridge longeron, main bridge tie-beam and main bridge decking, load sharing subtracts width device approach bridge part sets up at the tip of subtract width device main bridge part and extends to the road slope that lies in piece together wide bridge both sides, load sharing subtracts width device approach bridge part contains the approach bridge crossbeam, the approach longeron, approach tie-beam and approach bridge decking. Compared with the prior art, the utility model can greatly improve the limit bearing capacity of the width splicing bridge and improve the deflection change condition of the existing bridge; utilize the utility model discloses a partial load amplitude reduction device can greatly improve the natural vibration characteristic of existing old bridge, improves the natural vibration frequency of old bridge.
Description
Technical Field
The utility model belongs to the technical field of piece together wide bridge old bridge and consolidate temporarily, concretely relates to old bridge partial shipment subtracts width device for piecing together wide bridge.
Background
In recent years, when a widened new bridge of a reconstructed bridge is repaired, a road on the widened new bridge needs to be partially closed and traffic needs to be transferred to an existing old bridge, which seriously affects the structural safety of the existing old bridge under the action of vehicle load. The main reasons for such problems are: firstly, because the former design standard of existing old bridge is lower, under the situation of not sealing the wide new bridge traffic of piece together, vehicle weight on the existing old bridge is generally on the low side, and existing old bridge is in relative safe state this moment, and after the new bridge traffic is sealed to the part, road traffic load will all concentrate on existing old bridge, can seriously threaten old bridge safety. Secondly, because the rigidity difference between the new width-spliced bridge and the existing bridge is large, the vibration characteristics of the new width-spliced bridge and the existing bridge are different due to the influence of coupling vibration of the vehicle bridge, and the initial damage and the performance degradation of the joint of the new bridge and the old bridge are easily caused. Based on the reasons, even if certain traffic control measures are adopted for the existing old bridge during the maintenance of the wide new bridge, the frequency and the maximum value of the heavy-load vehicle load on the existing old bridge can be limited to a certain extent, and the load effect of the vehicle on the existing old bridge is not fundamentally improved. The problems of optimizing the load arrangement on the existing old bridge and improving the vibration amplitude of the existing old bridge under the maintenance state of the new bridge with the width spliced are particularly urgent.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an old bridge partial load amplitude reduction device for piecing together wide bridge in order to solve the problem that the limit bearing capacity of existing old bridge is not enough when the maintenance of the new bridge of the above-mentioned wide bridge of piecing together, utilize the load distribution form on the existing old bridge of partial load amplitude reduction device rational distribution, fundamentally improves the limit bearing capacity of existing old bridge not enough, the nature of shaking certainly.
The purpose of the utility model is realized through the following technical scheme:
a load-sharing and amplitude-reducing device for an old bridge of a spliced wide bridge is arranged on the spliced wide bridge, the spliced wide bridge comprises a spliced wide bridge superstructure and spliced wide bridge abutments arranged at two ends of the spliced wide bridge superstructure in pairs, the load-sharing and amplitude-reducing device comprises a main bridge part of the load-sharing and amplitude-reducing device and a paired approach bridge part of the load-sharing and amplitude-reducing device, the main bridge part of the load-sharing and amplitude-reducing device is horizontally arranged and comprises main bridge cross beams, main bridge longitudinal beams, main bridge connecting beams and main bridge abutment plates, a plurality of main bridge cross beams are arranged at the top surfaces of the spliced wide bridge superstructure and the spliced wide bridge abutments in parallel at intervals along the longitudinal direction of the bridge (namely the main bridge cross beams are all vertical to the longitudinal direction of the bridge), a plurality of main bridge longitudinal beams comprise main bridge side cross beams and main bridge cross beams which are arranged at the top of the main bridge cross beams in parallel at intervals along the transverse direction of the bridge (namely the main bridge longitudinal direction of the main bridge), the main bridge connecting beam is arranged between adjacent main bridge longitudinal beams, the main bridge deck plate is laid on the top surface of the main bridge longitudinal beams, the approach bridge part of the load-sharing amplitude-reducing device is arranged at the end part of the main bridge part of the amplitude-reducing device and extends obliquely towards roads on two sides of the spliced wide bridge (namely, one end of the approach bridge part of the load-sharing amplitude-reducing device is connected with the main bridge part of the load-sharing amplitude-reducing device, and the other end is positioned in a certain range of the roads on two sides of the spliced wide bridge), the approach bridge part of the load-sharing amplitude-reducing device comprises approach cross beams, approach longitudinal beams, approach connecting beams and approach bridge deck plates, wherein the approach cross beams are not of equal height and are arranged on the roads in parallel at intervals along the longitudinal direction of the bridge, the approach longitudinal beams are arranged on the tops of the approach cross beams in parallel at intervals along the transverse direction of the bridge, the approach connecting beams are arranged between the adjacent approach longitudinal beams, and the approach bridge deck plate is laid on the top surface of the approach cross beams of the approach bridge, the top of the approach girder. The main bridge cross beam and the approach bridge cross beam both play a supporting role, the main bridge longitudinal beam is transversely connected through the main bridge connecting beam to form a rigid framework of the main bridge part of the load sharing and amplitude reducing device, the main bridge deck directly bears the driving load, and the length of the main bridge longitudinal beam is set according to the sub-span arrangement mode of the main bridge part of the load sharing and amplitude reducing device.
The approach bridge deck close to one side of the main bridge part of the load sharing and amplitude reducing device forms a slope through an approach bridge longitudinal beam arranged on an approach bridge cross beam, the approach bridge longitudinal beam and the approach bridge transversely form a slope in a wedge block arrangement mode, and one sections of the approach bridge longitudinal beam and one section of the main bridge longitudinal beam are both arranged on a main bridge side span cross beam;
the approach bridge deck far away from one side of the main bridge part of the load sharing and amplitude reducing device is directly arranged on an approach bridge cross beam to form a slope, and the approach bridge deck and the approach bridge cross beam form a slope in a wedge block arrangement mode;
the slope formed by the approach bridge deck plate can not be obviously deformed under the action of vehicle load, and the condition that the structure of the approach bridge part is unstable is avoided.
The maximum longitudinal slope of the approach bridge part of the load-sharing and amplitude-reducing device is not more than 9%.
Piece together wide bridge superstructure and locate the piece together wide bridge seam between piece together wide new bridge superstructure and the existing bridge superstructure including piece together wide new bridge superstructure, existing old bridge superstructure, the partial top that is located existing old bridge superstructure and piece together wide bridge pier of carrying the device owner bridge, the partial road slope who is located existing old bridge superstructure both sides of device guide bridge portion of carrying the device of reducing the width extends.
The transverse bridge width of the main bridge part of the load-sharing and amplitude-reducing device is not more than the width of the upper structure of the existing bridge, namely if the width of the upper structure of the existing bridge is uneven, the transverse bridge width of the main bridge part of the load-sharing and amplitude-reducing device is smaller than the maximum width of the upper structure of the existing bridge;
the transverse bridge width of the approach bridge part of the load-sharing and amplitude-reducing device is not larger than the width of the upper structure of the existing bridge, namely, if the width of the upper structure of the existing bridge is uneven, the transverse bridge width of the approach bridge part of the load-sharing and amplitude-reducing device is smaller than the maximum width of the upper structure of the existing bridge.
The main bridge cross beam, the main bridge longitudinal beam, the main bridge connecting beam and the main bridge deck all adopt steel.
The main bridge cross beam, the main bridge longitudinal beam and the main bridge connecting beam are made of I-shaped steel, and the main bridge deck is made of plate-shaped steel.
The approach bridge cross beam, the approach bridge longitudinal beam, the approach bridge connecting beam and the approach bridge deck all adopt steel.
The bridge approach cross beam, the bridge approach longitudinal beam and the bridge approach connecting beam are made of I-shaped steel, and the bridge approach panel is made of plate-shaped steel.
The width-spliced bridge is a small and medium span width-spliced bridge with a bridge span of 8-20 m;
the main bridge part of the load sharing and amplitude reducing device is provided with three spans comprising 2 side spans and 1 midspan;
the main bridge longitudinal beam, the main bridge connecting beam and the main bridge deck form a combined body which is arranged above the main bridge cross beam in a mode of simply supporting two ends.
The main bridge mid-span cross beams positioned above the upper structure of the existing bridge are symmetrically arranged in the main beam span of the upper structure of the existing bridge, and the distance between the main bridge mid-span cross beams positioned above the upper structure of the existing bridge and the end part of the main beam of the upper structure of the existing bridge is calculated according to the following formula:
assuming that the automobile weight is F and is simplified into the concentrated force in computational analysis, the span of the upper structure of the existing old bridge is l, and the maximum deflection of the upper structure of the existing old bridge is as follows:
in the formula: e is the elastic modulus of the existing bridge superstructure (101), and I is the section moment of inertia of the existing bridge superstructure (101);
assuming that the distances between the midspan cross beam of the main bridge and the end parts of the main beams of the upper structure of the existing bridge are all a, the midspan length of the main bridge part of the load-sharing and amplitude-reducing device is l-2a, and the load-sharing and amplitude-reducing device is divided into two conditions according to the positions of vehicles:
when a vehicle is positioned on the side span of the main bridge part of the load-sharing and amplitude-reducing device, the maximum deflection of the upper structure of the existing bridge is as follows:
when the vehicle is positioned on the midspan of the main bridge part of the load-sharing and amplitude-reducing device, the maximum deflection of the upper structure of the existing bridge is as follows:
the distance between the cross beam in the midspan of the main bridge and the end part of the main beam of the upper structure of the existing bridge meets the following conditions:
the distance between the main bridge side span cross beam and the end part of the main beam of the upper structure of the existing bridge is not more than 1m.
The cross-sectional dimension of the main bridge longitudinal beam is controlled by the following method:
the deflection of the main bridge longitudinal beam under the load action is not more than l/400, the deflection of the main bridge longitudinal beam is calculated according to a formula (a), at the moment, E is the elastic modulus of steel used by the main bridge longitudinal beam (4) and the main bridge deck (6), and I is the sum of the section inertia moments of the main bridge longitudinal beam (4) and the main bridge deck (6); l is the single span length of the main bridge longitudinal beam (4), and the value is taken according to the maximum span when the multiple spans arranged on the main bridge part of the load sharing and amplitude reducing device are different.
The utility model discloses a set up the partial load amplitude reduction device on existing old bridge superstructure, under the condition that the new bridge maintenance needs the seal part lane, utilize the load distribution form on the existing old bridge of partial load amplitude reduction device rational distribution, fundamentally improves the existing old bridge limit bearing capacity not enough, the condition of the nature of shaking certainly, guarantee existing old bridge structure safety, be applicable to uninterrupted traffic maintenance and piece together wide new bridge, the condition such as construction is connected to the new and old bridge piece together wide under the uninterrupted traffic condition, the problem that the existing old bridge limit bearing capacity is not enough when the maintenance of the new bridge of above-mentioned piece together wide bridge can be solved.
Compared with the prior art, the utility model discloses possess following advantage:
the reasonable arrangement of the load-sharing and amplitude-reducing devices can greatly improve the ultimate bearing capacity of the spliced wide bridge and improve the deflection change condition of the existing bridge. The utility model discloses reduced the restriction degree of traffic control measure on the existing old bridge, had higher social and economic benefits. The complete equipment related by the utility model has lower cost and can be recycled, thus reducing the construction cost; utilize the utility model provides a load sharing amplitude reduction device and arrangement method when the new bridge of enlargement width is closed and is maintained in the reconstruction bridge, has improved the limit bearing capacity of existing old bridge, improves the natural vibration characteristic of existing old bridge, has improved the natural vibration frequency of old bridge, has improved the rigidity of existing bridge.
Drawings
FIG. 1 is a schematic longitudinal sectional view of an arrangement of a load sharing and dampening device;
FIG. 2 is a schematic plan view of the arrangement of the main bridge cross beam, the steel longitudinal beam and the connecting beam of the load-sharing amplitude-reducing device;
FIG. 3 is a schematic cross-sectional view of a main bridge arrangement of the load shedding and dampening apparatus;
fig. 4 is a schematic cross-sectional view of the arrangement of the approach bridge of the load-sharing and amplitude-reducing device.
In the figure: 1-splicing the upper structure of the wide bridge; 101-existing old bridge superstructure; 102-wide bridge joint splicing; 103-splicing the upper structure of the wide new bridge; 2-splicing wide bridge pier; 3-main bridge beam; 301-main bridge side span beam; 302-main bridge midspan cross beam; 4-main bridge longitudinal beam; 5-main bridge connecting beam; 6-main bridge deck; 7-approach bridge beam; 8-approach longitudinal beam; 9-bridge approach connecting beam; 10-approach bridge deck.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Examples
As shown in fig. 1, 2, 3 and 4, an old bridge load sharing and width reducing device for a split-width bridge is arranged on the split-width bridge, the split-width bridge is a medium-small span split-width bridge with a bridge span of 8-20 m, the split-width bridge comprises a split-width bridge superstructure 1 and split-width bridge abutments 2 arranged at two ends of the split-width bridge superstructure 1 in pairs, the split-width bridge superstructure 1 comprises a split-width new bridge superstructure 103, an existing old bridge superstructure 101 and split-width bridge joints 102 arranged between the split-width new bridge superstructure 103 and the existing old bridge superstructure 101, and the load sharing and width reducing device comprises a main bridge part of a load sharing and width sharing device approach bridge parts in pairs.
In the embodiment, the main bridge part of the load-sharing and amplitude-reducing device is provided with three spans comprising 2 side spans and 1 mid span, the main bridge part of the load-sharing and amplitude-reducing device is horizontally arranged and comprises main bridge cross beams 3, main bridge longitudinal beams 4, main bridge connecting beams 5 and main bridge decks 6, the main bridge cross beams 3 comprise main bridge side span cross beams 301 and main bridge mid span cross beams 302 which are arranged on the top surfaces of the existing upper bridge structure 101 and the widening bridge abutment 2 at intervals along the longitudinal direction of the bridge respectively, the main bridge longitudinal beams 4 are arranged on the top of the main bridge cross beams 3 at intervals along the transverse direction of the bridge, the main bridge connecting beams 5 are arranged between the adjacent main bridge longitudinal beams 4, the main bridge decks 6 are laid on the top surfaces of the main bridge longitudinal beams 4, the transverse bridge width of the main bridge part of the load-sharing and amplitude-reducing device is not more than the width of the existing upper bridge structure 101, main bridge longeron 4, the combination that main bridge tie-beam 5 and main bridge decking 6 formed adopts the simply supported mode in both ends to install in main bridge crossbeam 3's top, main bridge crossbeam 3, main bridge longeron 4, main bridge tie-beam 5 and main bridge decking 6 all adopt steel, concretely, main bridge crossbeam 3, main bridge longeron 4, main bridge tie-beam 5 adopts I-shaped steel, main bridge decking 6 adopts plate type steel, main bridge crossbeam 3 adopts 4 altogether in this embodiment, wherein two main bridge side span crossbeams 301 are located the top of existing old bridge superstructure 101 respectively, remaining two main bridge side span crossbeams 302 are located on piecing wide bridge abutment 2, main bridge side span crossbeams 302 stride the old symmetrical arrangement in the girder span about existing bridge superstructure 101, the distance of main bridge side span crossbeam 301 and the girder tip of existing bridge superstructure 101 is calculated according to following formula:
assuming that the weight of the automobile is F and is simplified into a concentrated force in computational analysis, the span of the upper structure 101 of the existing old bridge is l, and the maximum deflection of the upper structure 101 of the existing old bridge is as follows:
in the formula: e is the modulus of elasticity of the existing bridge superstructure 101, I is the moment of inertia of the cross-section of the existing bridge superstructure 101;
assuming that the distance between the midspan cross beam 302 of the main bridge and the end of the main beam of the upper structure 101 of the existing bridge is a, the midspan length of the main bridge part of the load-sharing and amplitude-reducing device is l-2a, and the two conditions are divided according to the position of the vehicle:
when a vehicle is located on the side span of the main bridge part of the load sharing and amplitude reducing device, the maximum deflection of the upper structure 101 of the existing bridge is as follows:
when the vehicle is located at the midspan of the main bridge portion of the load-sharing and amplitude-reducing device, the maximum deflection of the existing bridge superstructure 101 is:
the distance between the cross beam 302 in the main bridge and the end of the main beam of the upper structure 101 of the existing bridge meets the following conditions:
the distance between the main bridge side span cross beam 301 and the end of the main beam of the existing bridge superstructure 101 is not more than 1m.
The section size of the main bridge longitudinal beam 4 is controlled by the following method:
the deflection of the main bridge longitudinal beam 4 under the load action is not more than l/400, the deflection of the main bridge longitudinal beam 4 is calculated according to a formula (a), at the moment, E is the elastic modulus of steel used by the main bridge longitudinal beam 4 and the main bridge deck 6, and I is the sum of the section inertia moments of the main bridge longitudinal beam 4 and the main bridge deck 6; l is the single span length of the main bridge longitudinal beam 4, and the value is taken according to the maximum span when the multiple spans arranged on the main bridge part of the load sharing and amplitude reducing device are different.
The approach bridge part of the load sharing and amplitude reducing device is arranged at the end part of the main bridge part of the load sharing and amplitude reducing device and extends obliquely towards roads on two sides of the upper structure 101 of the existing bridge, the approach bridge part of the load sharing and amplitude reducing device comprises approach bridge cross beams 7, approach bridge longitudinal beams 8, approach bridge connecting beams 9 and approach bridge panels 10, the approach bridge cross beams 7 are not of equal height, the bridge deck boards 10 are obliquely laid on the tops of the bridge approach cross beams 7 and the bridge approach longitudinal beams 8, the bridge approach deck board 10 close to one side of a main bridge part of the load sharing and amplitude reducing device forms a slope through the bridge approach longitudinal beams 8 arranged on the bridge approach cross beams 7, the bridge approach longitudinal beams 8 and the bridge approach cross beams 7 form a slope in a wedge block arrangement mode, in the embodiment, one bridge approach cross beam 7 is arranged in the range, the bridge approach deck board 10 far away from one side of the main bridge part of the load sharing and amplitude reducing device is directly arranged on the bridge approach cross beam 7 to form the slope, form the slope through the mode that sets up the voussoir between access bridge panel 10 and access bridge crossbeam 7, set up two access bridge crossbeams 7 in this within range in this embodiment, the height of the access bridge crossbeam 7 of two positions department sets up according to actual conditions, the biggest longitudinal slope of partial load sharing amplitude reduction device approach bridge is not more than 9%, the crossbridge of partial load sharing amplitude reduction device approach bridge is not more than the width of existing bridge superstructure 101 to the width, access bridge crossbeam 7, access longeron 8, access bridge tie-beam 9 and access bridge panel 10 all adopt steel, specifically, access bridge crossbeam 7, access longeron 8, access bridge tie-beam 9 adopt I-shaped steel, access bridge panel 10 adopts board type steel.
The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should understand that all the improvements and modifications made without departing from the scope of the present invention according to the disclosure of the present invention should be within the protection scope of the present invention.
Claims (10)
1. A load sharing and amplitude reducing device for an old bridge of a spliced wide bridge is arranged on the spliced wide bridge and comprises a spliced wide bridge superstructure (1) and spliced wide bridge abutments (2) which are arranged at two ends of the spliced wide bridge superstructure (1) in pairs, and is characterized in that the load sharing and amplitude reducing device comprises a main bridge part of the load sharing and amplitude reducing device and a paired approach bridge part of the load sharing and amplitude reducing device, the main bridge part of the load sharing and amplitude reducing device is horizontally arranged and comprises a main bridge cross beam (3), a main bridge longitudinal beam (4), a main bridge connecting beam (5) and a main bridge deck (6), the main bridge cross beam (3) comprises a main bridge side span cross beam (301) and a main bridge mid-span cross beam (302), a plurality of main bridge cross beams (3) are respectively arranged on the top surfaces of the upper splicing-wide bridge structure (1) and the pier (2) of the splicing-wide bridge at intervals along the longitudinal direction of the bridge in parallel, a plurality of main bridge longitudinal beams (4) are arranged on the top of the main bridge cross beams (3) at intervals along the transverse direction of the bridge in parallel, main bridge connecting beams (5) are arranged between the adjacent main bridge longitudinal beams (4), a main bridge deck plate (6) is laid on the top surfaces of the main bridge longitudinal beams (4), a bridge approach part of the load sharing and amplitude reducing device is arranged at the end part of the main bridge part of the amplitude reducing device and extends obliquely towards roads on two sides of the splicing-wide bridge, and a bridge approach part of the load sharing and amplitude reducing device comprises a bridge approach cross beam (7), a bridge approach longitudinal beam (8), a bridge approach connecting beam (9) and a bridge approach deck plate (10), a plurality of approach bridge crossbeam (7) are not high to along bridge longitudinal separation parallel arrangement on the road, a plurality of approach bridge longerons (8) along the horizontal interval parallel arrangement in bridge at the top of approach bridge crossbeam (7), approach bridge tie-beam (9) set up between adjacent approach bridge longeron (8), the top of laying in approach bridge crossbeam (7), approach bridge longeron (8) is slope in approach bridge deck (10).
2. The old bridge load sharing and amplitude reducing device for the split-width bridge is characterized in that a bridge approach panel (10) close to one side of a main bridge part of the load sharing and amplitude reducing device forms a slope through a bridge approach longitudinal beam (8) arranged on a bridge approach cross beam (7), and a slope is formed between the bridge approach longitudinal beam (8) and the bridge approach cross beam (7) in a wedge block arrangement mode;
the approach bridge deck (10) far away from one side of the main bridge part of the load sharing and amplitude reducing device is directly arranged on the approach bridge cross beam (7) to form a slope, and a slope is formed between the approach bridge deck (10) and the approach bridge cross beam (7) through a wedge block arrangement mode.
3. The load sharing and amplitude reducing device for the old bridge for widening the bridge as recited in claim 1, wherein the maximum longitudinal slope of the approach part of the load sharing and amplitude reducing device is not more than 9%.
4. The device according to claim 1, wherein the bridge-widening superstructure (1) comprises a new bridge-widening superstructure (103), an old bridge superstructure (101) and a bridge-widening seam (102) arranged between the new bridge-widening superstructure (103) and the old bridge superstructure (101), and wherein the main bridge part of the device is located on top of the old bridge superstructure (101) and the bridge abutment (2), and wherein the bridge-widening device guides the bridge part to extend obliquely to the road on both sides of the old bridge superstructure (101).
5. The old bridge load sharing and amplitude reducing device for a bridge widening according to claim 4, characterized in that the transverse bridge width of the main bridge part of the load sharing and amplitude reducing device is not more than the width of the existing bridge superstructure (101);
the transverse bridge width of the approach bridge part of the load sharing and amplitude reducing device is not larger than the width of an upper structure (101) of the existing bridge.
6. The load sharing and amplitude reducing device for the old bridge of the split-width bridge is characterized in that the main bridge cross beam (3), the main bridge longitudinal beam (4), the main bridge connecting beam (5) and the main bridge deck (6) are made of steel;
and the bridge approach cross beam (7), the bridge approach longitudinal beam (8), the bridge approach connecting beam (9) and the bridge approach deck (10) are all made of steel.
7. The load sharing and amplitude reducing device for the old bridge of the spliced-width bridge as claimed in claim 1, wherein the spliced-width bridge is a small-and-medium-span spliced-width bridge with a bridge span of 8-20 m;
the main bridge part of the load sharing and amplitude reducing device is provided with three spans comprising 2 side spans and 1 midspan.
8. The used bridge load sharing and amplitude reducing device for widening a bridge according to claim 1, is characterized in that a combination formed by the main bridge longitudinal beams (4), the main bridge connecting beams (5) and the main bridge deck (6) is installed above the main bridge cross beams (3) in a mode of simply supporting two ends.
9. The device for reducing the partial load of an old bridge for widening a bridge according to claim 1, wherein the main bridge mid-span cross beam (302) positioned above the existing bridge superstructure (101) is symmetrically arranged with respect to the main bridge mid-span of the existing bridge superstructure (101), and the distance between the main bridge mid-span cross beam (302) positioned above the existing bridge superstructure (101) and the main bridge end of the existing bridge superstructure (101) is calculated according to the following formula:
assuming that the automobile weight is F and is simplified into a concentrated force in computational analysis, and the span of the existing bridge superstructure (101) is l, the maximum deflection of the existing bridge superstructure (101) is as follows:
in the formula: e is the elastic modulus of the existing bridge superstructure (101), and I is the section moment of inertia of the existing bridge superstructure (101);
assuming that the distance between a midspan cross beam (302) of the main bridge and the end of a main beam of an existing bridge superstructure (101) is a, the midspan length of the main bridge part of the load-sharing and amplitude-reducing device is l-2a, and the load-sharing and amplitude-reducing device is divided into two cases according to the position of a vehicle:
when the vehicle is positioned on the side span of the main bridge part of the load-sharing and amplitude-reducing device, the maximum deflection of the upper structure (101) of the existing bridge is as follows:
when the vehicle is positioned on the midspan of the main bridge part of the load-sharing and amplitude-reducing device, the maximum deflection of the upper structure (101) of the existing bridge is as follows:
the distance between the midspan cross beam (302) of the main bridge and the end part of the main beam of the upper structure (101) of the existing bridge meets the following conditions:
the distance between the main bridge side span cross beam (301) and the end part of the main beam of the existing bridge upper structure (101) is not more than 1m.
10. The device for widening old bridges of bridges according to claim 9, wherein the section size of the main bridge girder (4) is controlled by: the deflection of the main bridge longitudinal beam (4) under the load action is not more than l/400, the deflection of the main bridge longitudinal beam (4) is calculated according to a formula (a), at the moment, E is the elastic modulus of steel used by the main bridge longitudinal beam (4) and the main bridge deck (6), and I is the sum of the section inertia moments of the main bridge longitudinal beam (4) and the main bridge deck (6); l is the single span length of the main bridge longitudinal beam (4), and the value is taken according to the maximum span when the multiple spans arranged on the main bridge part of the load sharing and amplitude reducing device are different.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220623974.5U CN217781780U (en) | 2022-03-21 | 2022-03-21 | A old bridge load sharing amplitude reduction device for piecing together wide bridge |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220623974.5U CN217781780U (en) | 2022-03-21 | 2022-03-21 | A old bridge load sharing amplitude reduction device for piecing together wide bridge |
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| CN217781780U true CN217781780U (en) | 2022-11-11 |
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| CN202220623974.5U Expired - Fee Related CN217781780U (en) | 2022-03-21 | 2022-03-21 | A old bridge load sharing amplitude reduction device for piecing together wide bridge |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116561856A (en) * | 2023-05-06 | 2023-08-08 | 中交第二公路勘察设计研究院有限公司 | Staggered spliced wide bridge segment model test design method |
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2022
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116561856A (en) * | 2023-05-06 | 2023-08-08 | 中交第二公路勘察设计研究院有限公司 | Staggered spliced wide bridge segment model test design method |
| CN116561856B (en) * | 2023-05-06 | 2023-10-20 | 中交第二公路勘察设计研究院有限公司 | Staggered spliced wide bridge segment model test design method |
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Granted publication date: 20221111 |