CN202139529U - Structure for eliminating negative reaction of small-side span continuous beam support - Google Patents
Structure for eliminating negative reaction of small-side span continuous beam support Download PDFInfo
- Publication number
- CN202139529U CN202139529U CN201120144660U CN201120144660U CN202139529U CN 202139529 U CN202139529 U CN 202139529U CN 201120144660 U CN201120144660 U CN 201120144660U CN 201120144660 U CN201120144660 U CN 201120144660U CN 202139529 U CN202139529 U CN 202139529U
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- continuous beam
- negative reaction
- end bay
- bearing
- little end
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Abstract
On the premise of not influencing the safety of a bridge, a structure for eliminating negative reaction of a small-side span continuous beam support can eliminate the negative reaction of the small-side span continuous beam support economically and effectively, and comprises a lead bridge (20) and a continuous beam small side span (10) supported at a pier top cap by a support (11), wherein a bracket (13) is arranged at the end part of the continuous beam small side span (10), adjacent to the lead bridge (20); and the beam end of the lead bridge (20) is supported on the bracket (13) by a lead bridge support (21) and a bearing pad stone (22).
Description
Technical field
The utility model relates to bridge, particularly a kind of special tectonic of eliminating little end bay continuous beam bearing negative reaction.
Background technology
Prosperity day by day along with traffic network receives the restriction of grade separation condition, line condition, and continuous beam is joined and sometimes unavoidably occurred little end bay when striding, and arrangement is striden in this hole can cause end bay side bearing appearance of negative counter-force.
At present, eliminate negative reaction and adopt following method usually:
One, back timber.When end bay beam body pours into, suitably reduce the absolute altitude of beam body, through roof pressure makes beam body absolute altitude reach design load at the bearing place, increased the counter-force of bearing simultaneously.This method goes up top power through constructing is to force displacement to realize through applying.Its weak point is; Because the influence of factors such as beam body shrinkage and creep, support settlement, the last top power that adds in advance will be a changing value, and this forces displacement, and stressed influence is also changing to the beam body; Cause very big difficulty to design; This power can increase the tensile stress at central bearing point place simultaneously, increases the amount of deflection of creeping of beam body, causes adverse effect for the force-bearing situation, function of use etc. in beam body later stage.
Two, the beam section structure of adjustment two end bays.Through adjusting the beam body structure of little end bay, make little end bay cross section thickening become to increase greatly deadweight to eliminate negative reaction.Its weak point is, increased concrete and reinforcing bar amount in order to eliminate negative reaction, and is uneconomical; Make that the corresponding beam section in T structure both sides differed bigger when outstanding filling was constructed, increased difficulty of construction.
Three, increase the end bay ballast.Thereby under the little situation of negative reaction, can apply counterweight in case beam inside and eliminate negative reaction.Its weak point is that the counterweight of increase is excessive not only undesirable economically, and can have influence on the integral body and the secure topical of beam body.
The utility model content
The utility model technical problem to be solved provides the little end bay continuous beam of a kind of elimination bearing negative reaction structure, can not influence under the bridge security property prerequisite, eliminates little end bay continuous beam bearing negative reaction cost-effectively.
It is following that the utility model solves the technical scheme that its technical problem adopted:
The little end bay continuous beam of the elimination of the utility model bearing negative reaction structure; Comprise access bridge beam and the little end bay continuous beam through bearing support cap in the bridge pier top; It is characterized in that: the said little end bay continuous beam end adjacent with the access bridge beam is provided with bracket, and the access bridge beam-ends is bearing on this bracket through access bridge beam support and bearing pad stone.
The beneficial effect of the utility model is, directly the access bridge beam placed on the continuous beam, utilizes the deadweight of access bridge beam that the little end bay of continuous beam is applied ballast, can not influence under the bridge security property prerequisite, eliminates little end bay continuous beam bearing negative reaction cost-effectively; Easy construction, degree of safety is high.
Description of drawings
This manual comprises like next width of cloth accompanying drawing:
Fig. 1 is the structural representation that the utility model is eliminated little end bay continuous beam bearing negative reaction structure.
Component shown in the figure, toponym and pairing mark: the little end bay of continuous beam 10, continuous beam bearing 11, bridge pier top cap 12, bracket 13, shearing resistance prestressing tendon 14, access bridge beam 20, access bridge beam support 21, bearing pad stone 22.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is further specified.
The little end bay continuous beam of the elimination of the utility model bearing negative reaction structure comprises access bridge beam 20 and is supported on the little end bay 10 of continuous beam of bridge pier top cap 12 through bearing 11.The little end bay 10 of said continuous beam is provided with bracket 13 with access bridge beam 20 adjacent ends, and access bridge beam 20 beam-ends are bearing on the little end bay 10 of this continuous beam through access bridge beam support 21 and bearing pad stone 22.The utility model is directly placed access bridge beam 20 on the little end bay 10 of continuous beam, utilizes the access bridge beam that continuous beam is applied ballast, can not influence under the bridge security property prerequisite, eliminates little end bay continuous beam negative reaction cost-effectively.
With reference to Fig. 1, for improving the shear behavior of bracket, shearing resistance prestressing tendon 14 downwarpings of laying in the little end bay 10 of said continuous beam extend to bracket 13.
The little end bay continuous beam of the elimination of the utility model bearing negative reaction structure is compared with the prior art measure and following characteristics are arranged: economy does not increase concrete and amount of reinforcement; Difficulty of construction lowers, the corresponding beam section symmetry in T structure both sides when outstanding filling is constructed; Through bar bending under the longitudinal prestressing and shear behavior oblique, that vertical reinforcement improves bracket, safety factor is provided; Top/bottom part is all strengthened the longitudinal stress reinforcing bar, improves the roof and floor flexural property; Optimize continuous beam end bay support position, improve the stressed fringe conditions in beam-ends position; Easy construction, degree of safety is high.
The above the utility model that just explains through diagrams is eliminated some principles of little end bay continuous beam bearing negative reaction structure; Be not be to the utility model be confined to shown in described concrete structure and the scope of application in; So every the modify and equivalent that might be utilized all belongs to the claim that the utility model is applied for.
Claims (2)
1. eliminate little end bay continuous beam bearing negative reaction structure; Comprise access bridge beam (20) and be supported on the little end bay of continuous beam (10) of bridge pier top cap (12) through bearing (11); It is characterized in that: the little end bay of said continuous beam (10) is provided with bracket (13) with the adjacent end of access bridge beam (20), and access bridge beam (20) beam-ends is bearing on this bracket (13) through access bridge beam support (21) and bearing pad stone (22).
2. the little end bay continuous beam of elimination as claimed in claim 1 bearing negative reaction structure is characterized in that: shearing resistance prestressing tendon (14) downwarping of laying in the little end bay of said continuous beam (10) extends to bracket (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120144660U CN202139529U (en) | 2011-05-09 | 2011-05-09 | Structure for eliminating negative reaction of small-side span continuous beam support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120144660U CN202139529U (en) | 2011-05-09 | 2011-05-09 | Structure for eliminating negative reaction of small-side span continuous beam support |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202139529U true CN202139529U (en) | 2012-02-08 |
Family
ID=45550593
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120144660U Expired - Lifetime CN202139529U (en) | 2011-05-09 | 2011-05-09 | Structure for eliminating negative reaction of small-side span continuous beam support |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202139529U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105350448A (en) * | 2015-11-26 | 2016-02-24 | 四川省交通运输厅公路规划勘察设计研究院 | Structure for preventing main beam of cable-stayed bridge structure system from generating negative reaction |
-
2011
- 2011-05-09 CN CN201120144660U patent/CN202139529U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105350448A (en) * | 2015-11-26 | 2016-02-24 | 四川省交通运输厅公路规划勘察设计研究院 | Structure for preventing main beam of cable-stayed bridge structure system from generating negative reaction |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120208 |
|
| CX01 | Expiry of patent term |