CN221421717U

CN221421717U - Low tower cable-stayed reinforcing system of bridge

Info

Publication number: CN221421717U
Application number: CN202322747586.5U
Authority: CN
Inventors: 朱刚
Original assignee: Individual
Current assignee: Individual
Priority date: 2023-10-12
Filing date: 2023-10-12
Publication date: 2024-07-26
Anticipated expiration: 2033-10-12

Abstract

The utility model provides a cable-stayed reinforcing system for a short tower of a bridge. The low tower cable-stayed reinforcing system of the bridge comprises: bearing platform; a steel cross brace; the length of the joist extends longitudinally and the width of the joist extends transversely, the joist is arranged above the bearing platform vertically through the steel cross braces, and the joist is provided with a guy cable connecting part; the reinforcing mechanism comprises a diagonal tower column and a diagonal cable; the bottom end of the inclined tower column is fixedly arranged at the transverse end part of the bearing platform, and the top end of the inclined tower column protrudes to the vertical upper part of the joist; the top end of the inclined tower column is obliquely arranged towards the transverse outer side direction of the bearing platform relative to the bottom end; the stay cable passes through the top end of the inclined tower column and is connected to the cable connecting part, and is in tensioning arrangement. In the utility model, the joist bears main stress and rigidity, and the stay cable is responsible for improving the bending resistance and shearing resistance of the joist, so that the joist can be reinforced, a rigid-flexible combined structural system is formed, and dynamic loads such as earthquakes can be well resisted.

Description

Low tower cable-stayed reinforcing system of bridge

Technical Field

The utility model relates to a cable-stayed reinforcing system for a short tower of a bridge.

Background

The large-scale perfection and development of the domestic traffic infrastructure bring higher requirements to the structural rationality, construction simplicity, maintenance economy and the like of the bridge, and the large-span prestressed concrete continuous bridge has the advantages of good service performance, good earthquake resistance, convenient and quick construction, low cost, simple maintenance and the like, becomes a bridge shape with the competitiveness in the span range of 100-300 m, is widely adopted in the highway and railway systems in China, and has higher utilization rate particularly in urban overpasses, river and lake area bridge bridges and canyon zone bridges. With the great improvement of the domestic road transportation and cargo turnover, the obvious improvement of the speed of the automobile passing through the bridge and the excessive emergence of overload and heavy-load vehicles, the structural damage phenomenon of the in-service large-span PC continuous beam bridge is more serious. In addition, part of bridges even have the problem of inherent defects in design or construction, and many large-span prestressed concrete continuous beam bridges have the problems of long-term downwarping, web cracking and the like, so that the safety and the service performance of the bridge are seriously affected.

The prevention measures aiming at the large-span PC girder bridge can be divided into three types, namely prevention, prevention and disease prevention through process optimization; secondly, the influence of diseases is reduced by means of maintenance, reinforcement and the like, and the method specifically comprises a passive reinforcement method and an active reinforcement method; and thirdly, the old bridge with difficult maintenance is dismantled to solve the problem.

The passive reinforcement method comprises methods of pasting carbon fiber cloth, pasting steel plates and the like, and the reinforcement material generally has the characteristics of high strength, high elastic quantity and the like, can work cooperatively with the top, bottom or web concrete of the main bridge box girder, and improves the bending resistance bearing capacity of the joist. The method is convenient to construct, has little influence on the design size of the reinforced structure, and is suitable for buildings with larger space restrictions. However, the problems of unstable adhesion quality, corrosion resistance of the reinforcing material and the like still need to be solved, the reinforcing material also influences the appearance of the original structure, and many passively reinforced bridges often need secondary reinforcement in ten years.

The active reinforcing method includes light bridge deck, changing structural system (adding stay cable, additional steel box arch, continuous rigid frame, etc.), and newly adding adhesive prestress or external prestress. Wherein, the addition of the stay cable belongs to a structure-changing system method in an active reinforcement method, and can radically improve the long-term downwarping disease of the continuous beam bridge. However, the traditional stay cable reinforcing method needs to expand and reinforce the original bearing platform, and is difficult to use when the lateral remodelable space is limited.

Disclosure of utility model

The utility model aims to overcome at least one defect in the prior art and provides a low-tower cable-stayed reinforcing system for a bridge.

In order to achieve the above purpose, the present utility model is realized by the following technical scheme:

According to a first aspect of the utility model, a cable-stayed reinforcing system for a short tower of a bridge is provided. The low tower cable-stayed reinforcing system of the bridge comprises:

Bearing platform;

a steel cross brace;

The length of the joist extends longitudinally and the width of the joist extends transversely, the joist is arranged above the bearing platform vertically through the steel cross braces, and the joist is provided with a guy cable connecting part; and

The reinforcing mechanism comprises a diagonal tower column and a diagonal cable;

The bottom end of the inclined tower column is fixedly arranged at the transverse end part of the bearing platform, and the top end of the inclined tower column protrudes to the vertical upper part of the joist; the top end of the inclined tower column is obliquely arranged towards the transverse outer side direction of the bearing platform relative to the bottom end;

the stay cable passes through the top end of the inclined tower column and is connected to the cable connecting part, and is in tensioning arrangement.

Optionally, the transverse width of the bearing platform is smaller than the transverse width of the joist;

an acute angle is formed between the length extending direction of the inclined tower column and the vertical direction.

Optionally, the bearing platform is supplemented with a prestress pull rod or a profile steel support rod so as to be reinforced;

And the inclined tower column adopts a reinforced concrete steel pipe or a precast concrete column which is built on the bearing platform.

Optionally, the inclined tower column comprises a plurality of sections of split tower columns;

the multi-section tower separating column is spliced and installed on the bearing platform.

Optionally, the cross-sectional area of the inclined tower column gradually decreases along the direction from the bottom end of the inclined tower column to the top end.

Optionally, a connecting piece is fixedly arranged on the joist, and the connecting piece is transversely extended along the joist;

the two ends of the connecting piece are respectively provided with the inhaul cable connecting part.

Optionally, the stay cable is made of stainless steel wires.

Optionally, an anchor box is arranged at the top end of the inclined tower column, one end of the inclined stay cable is stretched at the stay cable connecting part, and the other end of the inclined stay cable is anchored in the anchor box; and/or the number of the groups of groups,

The top of the inclined tower column is provided with a sliding cable saddle for placing the inclined cable, so that two ends of the inclined cable are stretched at the two cable connecting parts respectively.

Optionally, the number of the inclined tower columns is provided with a plurality of pairs, including a middle inclined tower column and one or more side inclined tower columns respectively positioned at two longitudinal sides of the middle inclined tower;

The number of the stay cables is provided with a plurality of pairs;

An anchor box is arranged at the top end of the middle inclined tower column, one end of the inclined stay cable is stretched at the stay cable connecting part, and the other end of the inclined stay cable is anchored in the anchor box;

The top of the side inclined tower column is provided with a sliding cable saddle for placing the inclined cable, so that two ends of the inclined cable are stretched at two cable connecting parts respectively.

Optionally, the reinforcement mechanism has an axisymmetric structure in the transverse direction.

In the bridge short tower cable-stayed reinforcing system, the joists are arranged above the bearing platform vertically through the steel cross braces, the bottom ends of the inclined tower columns are fixedly arranged at the transverse end parts of the bearing platform, the top ends of the inclined tower columns protrude to the vertical upper parts of the joists, the top ends of the inclined tower columns are obliquely arranged towards the transverse outer direction of the bearing platform relative to the bottom ends, and the inclined cables are connected to cable connecting parts through the top ends of the inclined tower columns and are in tensioning arrangement. The joist bears main stress and rigidity, and the stay cable is responsible for improving the bending resistance and shearing resistance of the joist, so that the joist can be reinforced, a rigid-flexible combined structural system is formed, and dynamic loads such as earthquakes can be well resisted.

The inclined tower column bottom end is fixedly arranged at the transverse end part of the bearing platform, the top end of the inclined tower column protrudes to the vertical upper side of the joist to be connected with the inclined stay cable and is obliquely arranged towards the transverse outer side direction of the bearing platform relative to the bottom end, so that the transverse width of the bearing platform can be smaller relative to the transverse width of the joist, and the inclined tower column bottom end is particularly suitable for reinforcing bridges with limited lateral space.

The stay cable can decompose the pulling force applied to the joist to form a vertical component force, and the vertical component force can resist the self weight and the live load of the bridge. Because the inclined tower column is generally shorter in view of cost, a small acute angle is formed between the length extending direction of the inclined stay cable and the length extending direction of the joist, so that the tensile force exerted by the inclined stay cable on the joist can be decomposed to form a longitudinal component force, and the longitudinal component force forms the pressure on the joist to improve the compressive stress storage of the upper section and the lower section of the joist. The reinforcing mechanism is simple and clear in stress, can improve the linearity and the stress of the original bridge, greatly improves the bearing capacity of the bridge, and is high in reinforcing efficiency.

In the bridge low tower cable-stayed reinforcing system, the stress of the stay cable is concentrated, and the integral structure has small dependency on the stay cable, so that the secondary internal amplitude caused by vibration is also greatly reduced, and the fatigue resistance is also obviously improved.

The internal force of the structure is redistributed after the reinforcement, the problems of structural rigidity, deflection and bearing capacity are solved, and the bridge is stretched and attractive. The method is suitable for the conditions of overlarge beam deflection and insufficient bearing capacity, and is particularly suitable for beam bridges with multiple simply supported spans and low piers. Compared with the original bridge, the bridge low tower cable-stayed reinforcing system is more attractive and has a vivid landscape effect.

The bridge short tower cable-stayed reinforcing system does not obstruct traffic in the reinforcing process, the cable tower adopts a factory prefabrication field sectionally assembled steel cable tower, and the required construction period is shorter.

The stay cable only needs Zhang Ladao positions once when the bridge short tower cable-stayed reinforcing system is reinforced, and the repeated tensioning and adjustment like a normal cable-stayed bridge are not needed, so that the operation of constructors is facilitated.

Other features of the present utility model and its advantages will become apparent from the following detailed description of exemplary embodiments of the utility model, which proceeds with reference to the accompanying drawings.

Drawings

Fig. 1 is a schematic structural diagram of a cable-stayed reinforcing system for a short tower of a bridge according to an embodiment of the present utility model.

FIG. 2 is a schematic view of a partial structure of the cable-stayed reinforcement system of the bridge short tower of FIG. 1.

Fig. 3 is a front view of fig. 2.

Wherein:

10-bearing platform;

12-steel cross braces;

14-joists;

16-inclined tower column;

16A-middle inclined tower column;

16B-side inclined tower column;

18-stay cables;

20-connectors.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The terminology used in the embodiments of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

It should be noted that, the terms "upper", "lower", "left", "right", and the like in the embodiments of the present utility model are described in terms of the angles shown in the drawings, and should not be construed as limiting the embodiments of the present utility model. In the context of this document, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on the other element or be indirectly on the other element through intervening elements.

According to one embodiment of the utility model, a cable-stayed reinforcing system for a short tower of a bridge is provided. The low-tower cable-stayed reinforcing system can be used for reinforcing continuous bridges with limited lateral space.

Referring to fig. 1 to 3, the system for reinforcing a short tower cable-stayed bridge comprises a bearing platform 10, a steel cross brace 12, a joist 14 and a reinforcing mechanism. The platform 10 may be mounted on a support surface by means of posts.

The steel cross braces 12 are supported and mounted on the bearing platform 10, and the joists 14 are supported and mounted on the steel cross braces. Thus, joists 14 are mounted vertically above the deck 10 by steel cross braces 12. Joist 14 is provided with a cable connection.

The reinforcement mechanism includes a pitch tower 16 and a pitch cable 18. The two ends of the inclined tower column 16 in the length direction are respectively a bottom end and a top end. The bottom end of the inclined tower column 16 is fixedly arranged at the transverse X end part of the bearing platform 10. The top end of the diagonal column 16 projects vertically above the joist 14. For example, the pitch tower 16 height may be 15m-30m higher than the deck height of the joist 14.

The top end of the diagonal tower 16 is inclined with respect to the bottom end in the lateral direction X outside the platform 10. The diagonal tower 16 is spaced from the lateral ends of the joists 14 such that the diagonal tower 16 is clear of the joists 14. The pitch tower 16 is not connected to the joist 14.

Stay cables 18 are connected to the cable connection of joists 14 through the top of the tower 16 and stay cables 18 are tensioned. Stay cables 18 may exert tension on joists 14. Since the top end of the inclined tower 16 protrudes above the vertical direction Z of the joist 14, the inclined cable 18 passes through the top end of the inclined tower 16, so that the length extending direction of the inclined cable 18 forms an acute angle with the length extending direction of the joist 14.

The joist 14 bears main stress and rigidity, and the stay cable 18 is responsible for improving the bending resistance and shearing resistance of the joist 14, so that the joist 14 can be stiffened, a rigid-flexible combined structural system is formed, and dynamic loads such as earthquakes can be well resisted.

In one aspect, the tension applied to the joist 14 by the stay cable 18 may decompose to form a vertical component that resists bridge dead weight and live load. On the other hand, because the inclined tower 16 is generally shorter for cost reasons, a small acute angle is formed between the length extension direction of the inclined stay cable 18 and the length extension direction of the joist 14, so that the pulling force exerted by the inclined stay cable 18 on the joist 14 can be decomposed to form a longitudinal Y component, and the longitudinal component forms the pressure on the joist 14 to increase the compressive stress reserve of the upper and lower sections of the joist 14.

The reinforcing mechanism is simple and clear in stress, can improve the linearity and the stress of the original bridge, greatly improves the bearing capacity of the bridge, and is high in reinforcing efficiency.

In the bridge low tower cable-stayed reinforcing system, the stress of the stay cable 18 is concentrated, the integral structure has small dependence on the stay cable 18, so that the secondary internal amplitude caused by vibration is also greatly reduced, and the fatigue resistance is also obviously improved.

In this embodiment, referring to fig. 3, the bearing platform 10 is located directly below the vertical Z of the joist 14, and the joist 14 is mounted above the vertical Z of the bearing platform 10 by the steel cross braces 12. The lateral width of the platform 10 is smaller than the lateral width of the joists 14. The length extension direction of the inclined tower column 16 forms an acute included angle with the vertical Z.

The bottom end of the inclined tower column 16 is fixedly arranged at the transverse end part of the bearing platform 10, the top end of the inclined tower column protrudes to the vertical upper side of the joist 14 so as to be connected with the inclined stay rope 18 and is obliquely arranged towards the transverse outer side direction of the bearing platform 10 relative to the bottom end, so that the transverse width of the bearing platform 10 can be smaller relative to the transverse width of the joist 14, and the inclined tower column is particularly suitable for reinforcing bridges with limited lateral space.

In this embodiment, referring to fig. 2 and 3, the platform 10 may be reinforced to support and mount the tower 16. The abutment 10 can be reinforced in situ by pre-stressing the abutment 10. The prestress reinforcement method is to reinforce the structure or member by externally supplementing a prestress pull rod or a profile steel stay rod. The prestress reinforcing method features that the pre-stressing method forces the post-stressed pull rod or stay rod to bear partial internal force, change the internal force distribution of original structure and reduce the stress level of original structure, so that the stress hysteresis of newly-stressed member is relieved or eliminated completely, and the post-stressed part and the original structure can work together well to raise the bearing capacity of structure and reduce the deformation of structure. The prestress reinforcement method is simple and convenient to construct, and the prestress is applied to the post-added pull rod or the profile steel stay rod to change the internal force distribution of the original structure, eliminate the stress hysteresis phenomenon of the reinforcement part, enable the post-added part and the original component to better coordinate and work, improve the bearing capacity of the original structure, reduce the deflection deformation and reduce the width of the crack. The prestress reinforcement method has triple effects of reinforcement, unloading and changing the internal force distribution of the original structure.

The inclined tower column 16 can be a reinforced concrete steel pipe or a precast concrete column built on the bearing platform 10. Rigid or flexible stay cables 18 can be arranged on the top surface of the inclined tower column 16, and steel beams or reinforced beam transverse diaphragms arranged on the bridge bottom are pulled and lifted to provide one or more elastic supports for the upper structure of the original bridge, so that the original simply supported beam is changed into a continuous beam. This change in structural architecture results in improved structural stress conditions and thus improved structural load carrying capacity.

The diagonal column 16 may comprise a plurality of sections of split columns mounted in a spliced manner on the platform 10. The column may be prefabricated at the factory. The sections of the split tower columns can be spliced and installed into the inclined tower column 16 at the bridge reinforcement site. The bridge short tower cable-stayed reinforcing system does not obstruct traffic in the reinforcing process, the cable tower adopts a factory prefabrication field sectionally assembled steel cable tower, and the required construction period is shorter.

In this embodiment, referring to fig. 2 and 3, the cross-sectional area of the inclined tower 16 is gradually reduced along the direction from the bottom end of the inclined tower 16 toward the top end. Specifically, the thickness of the diagonal tower 16 may be tapered such that the cross-sectional area of the diagonal tower 16 is tapered. This reduces the dead weight of the pitch tower 16. The top end of the turret column 16 may be provided with an anchor region or a sliding cable saddle.

Referring to fig. 2, the joist 14 may be fixedly provided with a connecting member 20, and the connecting member 20 extends transversely along the joist 14. The connection member 20 is provided at both ends thereof with cable connection portions for connecting the stay cables 18, respectively. The tension control force of the stay cables 18 and the number of the stay cable 18 strands are determined according to the requirement. The stay cable 18 may be a stainless steel wire such that the stay cable 18 is a stainless steel stay cable 18.

The top end of the turret column 16 may be provided with a sliding saddle or anchor box. For example, the top end of the pylon 16 may be provided with an anchor box, with one end of the stay cable 18 being tensioned at the cable connection and the other end anchored within the anchor box. For another example, the top end of the pitch tower 16 may be provided with a sliding cable saddle for receiving the pitch cable 18 such that both ends of the pitch cable 18 are stretched at two cable connections, respectively.

In an alternative example, referring to FIG. 1, joists 14 extend a longer distance in longitudinal direction Y. The number of the reinforcing mechanisms, the bearing platforms 10 and the steel cross braces 12 can be multiple groups, and the reinforcing mechanisms, the bearing platforms 10 and the steel cross braces can be sequentially arranged at intervals in the longitudinal direction. The number of diagonal pylons 16 is provided in a plurality of pairs including a central diagonal pylon 16A and one or more side diagonal pylons 16B located on each of the two longitudinal sides of the central diagonal pylon. The number of stay cables 18 is correspondingly provided with a plurality of pairs.

The top end of the middle inclined tower column 16A is provided with an anchor box, one end of the inclined stay cable 18 is stretched at the stay cable connecting part, and the other end is anchored in the anchor box. In this way, the middle inclined tower column 16A is stretched at the joist 14 by single end stretching and is anchored in the anchor box at the top end of the inclined stay cable 18.

The top end of the side inclined tower column 16B is provided with a sliding cable saddle for placing the inclined cable 18, so that two ends of the inclined cable 18 are respectively stretched at the connecting parts of the two cables. In this way, the side diagonal columns 16B are tensioned at both ends, and are anchored by tensioning at the joists 14 on both sides of the side diagonal columns 16B in the longitudinal direction.

It should be noted that, the other areas of the inclined tower 16 except the top end anchoring area or the sliding cable saddle area are thickness-graded sections. The part above the thickness gradient section of the inclined tower column 16 is an anchoring area or a sliding cable saddle area, and the thickness of the anchoring area or the sliding cable saddle area can be not gradually reduced.

The stay cable 18 only needs Zhang Ladao positions once when the bridge short-tower cable-stayed reinforcing system is reinforced, and the split tensioning and adjustment like a normal cable-stayed bridge are not needed, so that the operation of constructors is facilitated.

In this embodiment, as shown in the figure, the reinforcement mechanism may have an axisymmetric structure in the lateral direction. Short inclined towers, stay cables 18 may be symmetrically arranged about the bridge centerline.

The internal force of the structure is redistributed after the reinforcement, the problems of structural rigidity, deflection and bearing capacity are solved, and the bridge is stretched and attractive. The method is suitable for the conditions of overlarge beam deflection and insufficient bearing capacity, and is particularly suitable for beam bridges with multiple simply supported spans and low piers.

Compared with the original bridge, the bridge low tower cable-stayed reinforcing system is more attractive and has a vivid landscape effect.

In the utility model, the joist is arranged above the bearing platform vertically through the steel cross brace, the bottom end of the inclined tower column is fixedly arranged at the transverse end part of the bearing platform, the top end of the inclined tower column protrudes above the joist vertically, the top end of the inclined tower column is obliquely arranged towards the transverse outer direction of the bearing platform relative to the bottom end, and the inclined cable passes through the top end of the inclined tower column and is connected to the cable connecting part. The joist bears main stress and rigidity, and the stay cable is responsible for improving the bending resistance and shearing resistance of the joist, so that the joist can be reinforced, a rigid-flexible combined structural system is formed, and dynamic loads such as earthquakes can be well resisted.

The above is only a preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model, and any modifications, equivalent substitutions or improvements within the spirit of the present utility model are intended to be covered by the claims of the present utility model.

Claims

1. A system for cable-stayed reinforcement of a short tower of a bridge, comprising:

Bearing platform;

a steel cross brace;

2. The bridge low pylon cable stayed reinforcing system according to claim 1, wherein:

The transverse width of the bearing platform is smaller than that of the joist;

3. The bridge low pylon cable stayed reinforcing system according to claim 1, wherein:

The bearing platform is supplemented with a prestress pull rod or a profile steel support rod so as to be reinforced;

4. The bridge low pylon cable stayed reinforcing system according to claim 1, wherein:

The inclined tower column comprises a plurality of sections of tower dividing columns;

5. The bridge low pylon cable stayed reinforcing system according to claim 1, wherein:

along the direction of the bottom end of the inclined tower column towards the top end, the cross section area of the inclined tower column is gradually reduced.

6. The bridge low pylon cable stayed reinforcing system according to claim 1, wherein:

The joist is fixedly provided with a connecting piece which extends transversely along the joist;

7. The bridge low pylon cable stayed reinforcing system according to claim 1, wherein:

the stay cable is made of stainless steel wires.

8. The bridge low pylon cable stayed reinforcing system according to claim 1, wherein:

An anchor box is arranged at the top end of the inclined tower column, one end of the inclined stay cable is stretched at the stay cable connecting part, and the other end of the inclined stay cable is anchored in the anchor box; and/or the number of the groups of groups,

9. The bridge low pylon cable stayed reinforcing system of claim 8, wherein:

The number of the inclined tower columns is provided with a plurality of pairs, and the inclined tower columns comprise a middle inclined tower column and one or more side inclined tower columns respectively positioned at two longitudinal sides of the middle inclined tower;

The number of the stay cables is provided with a plurality of pairs;

10. The bridge pylon cable stayed reinforcement system of any one of claims 1-9, wherein:

the reinforcing mechanism is in an axisymmetric structure in the transverse direction.