CN217629391U - Wide-angle concrete V mound flexible pull rod device - Google Patents
Wide-angle concrete V mound flexible pull rod device Download PDFInfo
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- CN217629391U CN217629391U CN202221447507.8U CN202221447507U CN217629391U CN 217629391 U CN217629391 U CN 217629391U CN 202221447507 U CN202221447507 U CN 202221447507U CN 217629391 U CN217629391 U CN 217629391U
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Abstract
The utility model belongs to the technical field of the building element, specifically be a flexible pull rod device of wide-angle concrete V mound. The device comprises an external prestressed tendon, a profile steel pull rod and an external tendon shock absorber; the external prestressed beam has a plurality of beam splitters and bears most of horizontal component force of the pier top; all the beams are symmetrically distributed at the top of the V-shaped pier; the section steel pull rods are provided with a plurality of sections and bear the horizontal component force of the pier top when the external prestressed beam fails; the profile steel pull rod and the external prestressing tendons are arranged on the top of the V pier in parallel; the external prestressed tendons are respectively arranged on the external prestressed tendons and used for limiting the downwarping of the external prestressed tendons and the vibration amplitude under the action of live load, and the vibration absorbers are fixed at the bottom of the main beam; the device adopts the external prestressed steel beam as a main stress member, fully exerts the tensile characteristic of the prestressed steel beam, releases the deformation limit of the pier top of the V-shaped pier, and reduces the temperature stress of the V-shaped pier and the secondary internal force generated by the shrinkage and creep of the concrete; meanwhile, the permeability of the space under the bridge is increased, and the landscape effect of the bridge is improved.
Description
Technical Field
The utility model belongs to the technical field of the building element, concretely relates to flexible pull rod device of wide-angle concrete V mound.
Background
The large-angle V pier is an important component of the landscape multi-span arch bridge, the appearance structure of the V pier influences the appearance of the full-bridge landscape effect, the structural safety of the V pier directly concerns the safety of the whole bridge, and the pull rod on the top of the V pier is a life line of the structural safety of the V pier. Therefore, the reasonable optimization design of the V-shaped pier pull rod is always the key content in the design of the same type of bridge.
The main beam of the landscape multi-span arch bridge usually adopts a steel structure, the V pier adopts a concrete structure, the angle of the V pier is larger, the distance from the bottom of the main beam to the bottom of the V pier is smaller, and the permeability of the space under the bridge directly influences the appearance of the whole landscape effect of the bridge. Therefore, the design of the V-pier tie rod needs to meet the requirements of structural safety, applicability, structural complexity, overall landscape of the bridge and the like.
At present, the conventional form of the concrete V pier top pull rod mainly comprises: (1) The V-shaped pier top is fixedly connected with the main beam, and the main beam is used as a pier top pull rod; (2) The concrete beam provided with the prestressed steel strand is separately provided as a tension rod.
The form (1) is mostly seen in a V-shaped pier continuous rigid frame bridge, and the main beam and the V pier generally adopt a prestressed concrete structure in a unified way. Form (2), the prestressed concrete pull rod that sets up alone, its cross-sectional dimension is great, if arrange in the girder middle part can greatly restrict the selection of girder section form, if arrange in girder below or both sides then can influence the presentation of the whole view effect of bridge. The two pull rods are rigid pull rods, and the structure can cause large temperature stress in the V pier triangle area and secondary internal force generated by concrete shrinkage and creep, and additional beam matching or structure adjustment is needed for responding.
SUMMERY OF THE UTILITY MODEL
The utility model provides a wide-angle concrete V mound flexible draw bar device to realize following target:
(1) The structure has better applicability;
(2) The temperature stress of the V pier and the secondary internal force generated by the shrinkage and creep of the concrete are reduced;
(3) The permeability of the space under the bridge is increased, and the overall landscape effect of the bridge is improved.
The utility model discloses a flexible pull rod device of wide-angle concrete V mound utilizes conventional component to carry out organic combination, and one set of flexible pull rod device who obtains. Combine the atress characteristics of V mound, the material characteristic of component, fully consider structural security and durability to confirm the utility model discloses each partial functional action of flexible pull rod device, arrangement mode and construction process etc..
The utility model relates to a wide-angle concrete V pier flexible pull rod device, which mainly comprises three parts, namely an external prestressed beam, a profile steel pull rod and an external beam shock absorber; wherein:
the external prestressed beam is provided with N beam splitters, is a main stressed component under the normal use condition and bears most of horizontal component force of the pier top; the total cross section of the external prestressed beam is determined according to the stress condition of the V pier under the condition of bearing capacity limit, and the control stress under the steel beam anchor is sigma con =0.38~0.42f pk (ii) a The beam splitting arrangement comprehensively considers the structure size of the V pier, the requirement of batch tension in the construction process and the special condition of failure of replacing or part of the steel bundles; the sectional area of a single beam is not more than 20% of the total sectional area, namely the beam splitting number N is more than or equal to 5, and the beam splitting number N is symmetrically arranged at the top of the V pier so as to ensure the safety of the V pier structure and reasonable stress;
the profile steel pull rod is provided with M pieces of stress components which ensure the structural safety under special conditions, bears the horizontal component force of the pier top when the external prestressed beam fails, and basically does not participate in stress under normal use conditions; the structural steel pull rod adopts a biaxial symmetrical section, the total section area is calculated according to the horizontal component force of the V pier top when the external prestressing tendon completely fails, and the steel strength is designed strength; the sectional area of the single section steel pull rod does not exceed 50 percent of the total sectional area, namely the number M is more than or equal to 2;
the profile steel pull rod and the external prestressing tendons are arranged on the top of the V-shaped pier in parallel;
the root of the profile steel pull rod is pre-buried in the V-shaped pier construction process, and after the bridge deck auxiliary engineering construction is completed, the middle section and the root are hoisted and welded into a whole, so that the situation that the profile steel pull rod excessively participates in the stress of the V-shaped pier under the normal use condition is avoided, and the action of the profile steel pull rod is not considered during the calculation and analysis of the V-shaped pier;
the external prestressed beams are respectively arranged on the external prestressed beams at certain intervals and are mainly used for limiting the downwarping of the external prestressed beams and the vibration amplitude under the action of live load, and the vibration absorbers are fixed at the bottom of the main beam by utilizing the connecting rods after wrapping the external prestressed beams. The inner diameter of the rubber gasket in the shock absorber is 1-2cm larger than the diameter of the cable body, so that the cable body has a certain moving space, the deformation of the main beam under the action of live load can be avoided, and the steel beam is driven to vibrate up and down. Because the angle of the V pier is larger, and the exposed length of the pier top external beam is longer, the external beam shock absorber is used for limiting the downwarping of the external prestressed beam and the vibration amplitude under the action of live load.
Compared with the prior art, the flexible pull rod device adopts conventional components and has better applicability in similar structures. The V-pier top pull rod mainly plays a role in balancing horizontal component force of the inclined legs on two sides, and is mainly pulled. The device adopts the external prestressed steel beam as a main stress member, fully exerts the tensile characteristic of the prestressed steel beam, releases the limit of deformation of the pier top of the V-shaped pier, and reduces the temperature stress of the V-shaped pier and the secondary internal force generated by the shrinkage and creep of the concrete. Meanwhile, the permeability of the space under the bridge is increased, and the landscape effect of the bridge is improved.
Drawings
Fig. 1 is a schematic view of the arrangement of the external prestressing tendons in elevation.
FIG. 2 is a schematic view of the profile steel pull rod in elevation arrangement.
Fig. 3 is a schematic cross-sectional arrangement.
Fig. 4 is a schematic diagram of the structure of the external beam vibration absorber.
The reference numbers in the figures: 1 is an external prestressed tendon; 2 is a section steel pull rod; 3 is an external beam shock absorber; 4 is a concrete V pier; 5 is a main beam; and 6 is an inner rubber gasket of the shock absorber.
Detailed Description
Use golden coast bridge (view multispan continuous arch bridge) as the engineering background, the V mound adopts the utility model discloses and utilize the software of finite element to establish the three-dimensional rod system model and the three-dimensional finite element solid model of V mound, carry out the analysis and verify.
6 bundles of 19-phi 15.2 external prestressed steel bundles are arranged at the top of the main bridge V pier (see figures 1 and 3), and the control stress sigma con under the anchor is 0.38 to 0.42f pk . The steel bundle tensioning sequence is as follows: tensioning 4 steel bundles in the middle of the V pier → installing the girder → tensioning 2 steel bundles outside → second-stage construction.
Two HW400x400x13x21 profile steel pull rods are arranged in the middle of the external prestressing force (see figures 2 and 3).
The exposed length of the outer beam of the V-shaped pier top body is about 24m, and a shock absorber is arranged every 6m for limiting the vibration amplitude of the steel beam.
According to calculation, the temperature stress of the V pier and the secondary internal force generated by the shrinkage and creep of the concrete are smaller. Under the normal use condition, the stress of the body external beam anchor head region is larger, the distribution region is more concentrated, the stress diffusion is faster, the stress of the middle hollow section and the lower arc section of the bridge pier is smaller, and the standard requirement is met. The vertical size of the outline of the whole flexible pull rod device is only 60cm, the permeability of the space under the bridge is better, and the overall landscape effect of the bridge is better.
Claims (1)
1. The utility model provides a flexible pull rod device of wide-angle concrete V mound which characterized in that contains three parts: the external prestressed beam, the profile steel pull rod and the external beam shock absorber; wherein:
the external prestressed beam is provided with N beam splitters, is arranged between the pier tops on two sides, is a main stressed component under the normal use condition and bears the horizontal component force of the pier tops; the sectional area of each single beam does not exceed 20 percent of the total sectional area, namely the beam splitting number N is more than or equal to 5, and the single beams are symmetrically arranged at the top of the V pier;
the section steel pull rods are provided with M sections, are arranged between the pier tops at two sides and bear the horizontal component force of the pier tops when the external prestress tendons lose efficacy; the section steel pull rod adopts a biaxial symmetrical section, the total section area of the section steel pull rod is determined by calculating according to the horizontal component force of the V pier top when the external prestress beam completely bears the total failure, the sectional area of a single section steel pull rod does not exceed 50 percent of the total sectional area, namely the number M is more than or equal to 2;
the profile steel pull rod and the external prestressing tendons are arranged on the top of the V-shaped pier in parallel;
the external prestressed beams are respectively arranged on the external prestressed beams at certain intervals and used for limiting the downwarping of the external prestressed beams and the vibration amplitude under the action of live load, and the external prestressed beams are wrapped by the vibration absorbers and then are fixed at the bottom of the main beam by using the connecting rods; the rubber gasket is arranged in the shock absorber, the inner diameter of the rubber gasket is 1-2cm larger than the diameter of the cable body, so that the cable body has a certain moving space, and the steel beam is prevented from vibrating up and down due to deformation of the main beam under the action of live load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221447507.8U CN217629391U (en) | 2022-06-10 | 2022-06-10 | Wide-angle concrete V mound flexible pull rod device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221447507.8U CN217629391U (en) | 2022-06-10 | 2022-06-10 | Wide-angle concrete V mound flexible pull rod device |
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| Publication Number | Publication Date |
|---|---|
| CN217629391U true CN217629391U (en) | 2022-10-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221447507.8U Active CN217629391U (en) | 2022-06-10 | 2022-06-10 | Wide-angle concrete V mound flexible pull rod device |
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| Country | Link |
|---|---|
| CN (1) | CN217629391U (en) |
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2022
- 2022-06-10 CN CN202221447507.8U patent/CN217629391U/en active Active
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