CN109930480B - Hidden anchor cantilever beam type comb-tooth bridge expansion device - Google Patents
Hidden anchor cantilever beam type comb-tooth bridge expansion device Download PDFInfo
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- CN109930480B CN109930480B CN201910317844.1A CN201910317844A CN109930480B CN 109930480 B CN109930480 B CN 109930480B CN 201910317844 A CN201910317844 A CN 201910317844A CN 109930480 B CN109930480 B CN 109930480B
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Abstract
The invention relates to a hidden anchor cantilever beam type comb-tooth bridge expansion device which comprises two comb-tooth plates respectively arranged on bridge members at two sides of an expansion joint, wherein comb teeth of the two comb-tooth plates are inserted in a staggered manner, the bottom of each comb tooth is connected with a vertical stiffening rib and is formed into a cantilever beam type structure, the cantilever beam type structure is hidden anchored on the bridge member at the corresponding side through an anchor plate, and the anchor plate is respectively fixedly connected with the fixed end of the comb-tooth plate at the corresponding side and the corresponding vertical stiffening rib and welded with the internal reinforcing steel bar of the bridge member at the corresponding side. According to the invention, the vertical stiffening ribs are arranged at the bottom of the comb plate and are combined into the cantilever beam type structure, so that the comb type expansion device is converted into a beam type structure system from a conventional plate type structure system, the section moment of inertia and section rigidity of the expansion device can be effectively increased, and the service life of the expansion device is prolonged.
Description
Technical Field
The invention belongs to the technical field of bridges, and particularly relates to a hidden anchor cantilever type comb-tooth type bridge expansion device.
Background
The expansion device is a key part in the bridge member and plays an important role in realizing the bridge function. The common bridge expansion device comprises two types of modular bridge expansion devices and comb-tooth type bridge expansion devices.
The comb plate type telescopic device is provided with a steel comb plate type and a steel flat plate overlapped type, and the appearing damage forms mainly comprise:
(1) anchor disease;
(2) diseases of the comb plate;
(3) rotating the control seat and rotating shaft to prevent diseases;
(4) dust, garbage and water leak are fully accumulated in the waterproof rubber strip.
The damage causes are design reasons, processing technology problems, construction quality problems, management and maintenance problems and the like in the case of partial steel expansion devices which are damaged at present. The expansion device is easy to deform in the process of processing and using, the toothed plate and the backing plate are difficult to be attached, and once gaps are generated, the connecting system and the connecting part are stressed disadvantageously, so that noise and vehicle jump are caused; in addition, the problems of large traffic, frequent load impact, easy premature fatigue, loosening of fastening bolts, exposed turning and tilting of the comb plate, easy clamping of gaps of the comb plate by sundries and the like are caused, and the telescopic function, the imperfect drainage function and the like are affected.
From the analysis of the stress characteristics of the comb plate type expansion device, the causes of diseases of the comb plate type expansion device mainly comprise the following points:
(1) The telescopic device cannot meet the requirement of transverse displacement; meanwhile, when the beam body transversely rotates, the interaction force between the comb plates is applied to form larger shearing force on the fixing bolts, and the bolts are easy to break.
(2) The device can not meet the requirement of vertical deflection
The vertical rotation mainly refers to the deflection performance of the bridge expansion device under the action of load, the expansion device has no vertical rotation function, the device is fixed on a bridge panel at the beam end only by rivets, when the device bears the load and generates vertical deflection, the device forms larger drawing force to Liang Tixing by the rivets, and nuts are loosened or fall off frequently; when a frequent impact load is applied to the device, the device can be bent and deformed and the comb teeth can be broken when the device is heavy.
(3) The adaptability of the traditional seam-crossing comb-tooth type telescopic device to the longitudinal slope is relatively poor
From the analysis of the deformation of the beam, the adaptability of the comb plate type telescopic device is possible when the longitudinal slope of the bridge is a flat slope, but the adaptability of the comb plate type telescopic device to the change of the gradient is poor when the longitudinal section has the gradient.
The specific mechanics principle is shown in fig. 1, from which it can be seen that: when the longitudinal section has a gradient and the beam stretches, the steel plate of the toothed plate type telescopic device cannot automatically adapt to the change of the gradient to become a broken line. If the diagram assumes that before the main beams at two sides of the telescopic device are shifted, the gap at the beam end is 100cm, the longitudinal slope is 3%, and the height difference between the two AB points is 3cm, but when the gap at the beam end is shortened to 50cm due to temperature change, the height difference between the two AB points is still 3cm, and the gradient is increased from 3% to 6%; the gradient of the steel comb plate on the main beam is still 3%, so that the deformed beam end can exert a large jacking force on the steel comb plate, the steel comb plate is required to tilt under the action of the force, the steel plate is required to deform, and the bolts are easy to loosen under the action of impact load.
Disclosure of Invention
The embodiment of the invention relates to a hidden anchor cantilever type comb-tooth type bridge expansion device, which at least can solve part of defects in the prior art.
The embodiment of the invention relates to a hidden anchor cantilever type comb-tooth bridge expansion device which comprises two comb-tooth plates respectively arranged on bridge members at two sides of an expansion joint, wherein comb teeth of the two comb-tooth plates are inserted in a staggered manner, the bottom of each comb tooth is connected with a vertical stiffening rib and is formed into a cantilever type structure, the cantilever type structure is hidden anchored on the bridge member at the corresponding side through an anchor plate, and the anchor plate is respectively fixedly connected with the fixed end of the comb-tooth plate at the corresponding side and the corresponding vertical stiffening rib and welded with the reinforcing steel bars inside the bridge member at the corresponding side.
As one of the embodiments, the bridge member on each side is provided with a horizontal stress dispersion steel plate, the horizontal stress dispersion steel plate includes an inclined section having an included angle with the horizontal plane, and each vertical stiffening rib is respectively fixed on the inclined section on the corresponding side.
As one of the embodiments, the horizontal stress dispersion steel plate further includes a horizontal segment connected to the top end of the inclined segment, and the horizontal segment is welded with the corresponding comb plate.
As one of the embodiments, each of the vertical stiffeners is in the form of an I-type or a T-type.
As one of the embodiments, the internal steel bars of the bridge member include portal-type steel bars embedded in the bridge member.
As one embodiment, the hidden anchor cantilever type comb-type bridge expansion device further comprises a water stopping structure connected to the two bridge members, and the water stopping structure is located below the cantilever type structure.
The embodiment of the invention has at least the following beneficial effects:
according to the hidden anchor cantilever type comb-shaped bridge expansion device, the vertical stiffening ribs are arranged at the bottoms of the comb-shaped plates and are combined into the cantilever type structure, so that the comb-shaped expansion device is converted into a beam type structure system from a conventional plate type structure system, the section moment of inertia and section rigidity of the expansion device can be effectively increased, and the service life of the expansion device is prolonged. The cantilever beam type structure is anchored and fixed on the bridge member, and the whole cantilever beam type structure is used as a structural stress system, so that the anchoring performance of the comb plate is improved, a traditional bolt connection mode is not adopted, and the defect that the traditional anchor bolt structure mode is easy to separate is avoided.
The embodiment of the invention further has the following beneficial effects:
the invention provides a hidden anchor cantilever beam type comb-shaped bridge expansion device, wherein comb plates are symmetrically arranged on two sides of a bridge structural joint. Because the expansion device toothed plates are displaced or rotated by the central line of the structural joint, the vertical height difference caused by the expansion of the bridge longitudinal slope or the bridge body has no influence on the structure, and the comb plate structure cannot be subjected to the jacking force on the panel caused by the vertical height difference.
The embodiment of the invention further has the following beneficial effects:
by adopting the horizontal stress dispersion steel plates, the impact load of the wheels can be transferred to the bridge member through the horizontal stress dispersion steel plates when the cantilever beam structure is subjected to integral cooperative stress, so that the contact area between the cantilever beam structure and the concrete structure of the bridge member is increased, the load is dispersed into the bridge concrete structure, the local stress of the bridge concrete is avoided, and the concrete in the installation area of the expansion joint can be better protected; in particular, the structure of the inclined section is arranged based on the horizontal stress dispersion steel plate, so that the borne wheel impact load is decomposed into horizontal stress and vertical stress, and the whole bridge member bears the wheel impact.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a longitudinal height difference of a beam end provided in the background art;
fig. 2 is a schematic cross-sectional structure diagram of a hidden anchor cantilever type comb-shaped bridge expansion device according to an embodiment of the present invention;
FIGS. 3 and 4 are schematic elevational views of two forms of cantilever beam structures according to embodiments of the present invention;
fig. 5 is a structural plan view of a hidden anchor cantilever type comb-type bridge expansion device provided by the embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
As shown in fig. 2-5, the embodiment of the invention provides a hidden anchor cantilever type comb-tooth type bridge expansion device, which comprises two comb-tooth plates 1 respectively arranged on bridge members 8 on two sides of an expansion joint, wherein comb teeth of the two comb-tooth plates 1 are embedded in a staggered manner, the bottom of each comb tooth is connected with a vertical stiffening rib 2 and is formed into a cantilever type structure, the cantilever type structure is fixed on the bridge member 8 on the corresponding side in a hidden anchoring manner through an anchor pulling plate 4, and the anchor pulling plate 4 is respectively fixedly connected with a fixed end of the comb-tooth plate on the corresponding side and the corresponding vertical stiffening rib 2 and welded with reinforcing bars inside the bridge member on the corresponding side.
It is easy to understand that the bridge member 8 may be a bridge body, or may be a bridge abutment, that is, two bridge bodies located at two sides of the expansion joint, or a bridge body and a bridge abutment respectively located at two sides of the expansion joint.
The comb plate 1 is generally a steel plate, and generally includes a spine plate connected to the bridge member 8 on the corresponding side, and a plurality of comb teeth provided on the spine plate, each of the comb teeth being configured as a free end of the comb plate 1. The structure of staggered and embedded comb teeth of the two comb plates 1 is a conventional structure of a comb-tooth type bridge expansion device in the field, and detailed description is omitted here. Obviously, each vertical stiffening rib 2 at two sides of the expansion joint is also of a mutually staggered structure.
As shown in fig. 3 and 4, the vertical stiffening rib 2 may be in the form of an "I-shaped" stiffening rib or a "T-shaped" stiffening rib, and can well support the corresponding comb plate 1 while forming an cantilever structure with the comb plate 1. In this embodiment, the vertical stiffening rib 2 is preferably a vertical stiffening rib 2 welded at the bottom of the corresponding side comb plate 1, and the connection structure with the comb plate 1 is reliable and stable, has good cooperative stress performance, and is convenient to construct.
The anchor plate 4 is generally a steel plate, which is welded and fixed with the comb plate 1, and for the steel vertical stiffening ribs 2 such as the vertical stiffening ribs 2, the anchor plate 4 and the vertical stiffening ribs 2 are also preferably welded and fixed; the whole cooperative stress performance of the cantilever beam type structure can be enhanced by a welding and fixing mode.
As shown in fig. 2, in the manner of fixing the anchor plate 4 to the bridge member 8 on the opposite side, portal-type reinforcing steel bars 6 may be embedded in the bridge member 8, and the portal-type reinforcing steel bars 6 may be welded to the anchor plate 4 on the opposite side; specifically, the portal type steel bar 6 is of a square frame structure, the structure of the portal type steel bar 6 located below is broken, the portal type steel bar 6 is partially pre-buried when being installed in preparation of a bridge body or a bridge deck, double-sided welding is conducted between the anchor pull plate 4 and the portal type steel bar 6, and stability of the cantilever type structure can be further improved.
Further, as shown in fig. 2, the anchor plate 4 is further connected with the corresponding side bridge member 8 through the anchor reinforcing bars 5, preferably, the portal reinforcing bars 6 are used for realizing the fixation between the anchor plate 4 and the pre-cast structure of the bridge member 8, and the anchor reinforcing bars 5 are used for realizing the fixation between the anchor plate 4 and the post-cast structure of the bridge member 8, so as to ensure the stability and reliability of the connection structure between the anchor plate 4 and the bridge member 8 and the overall stress performance of the cantilever beam structure.
The hidden anchor cantilever beam type comb-tooth bridge expansion device provided by the embodiment is characterized in that vertical stiffening ribs are arranged at the bottom of the comb plate 1 and are combined into a cantilever beam type structure, so that the comb-tooth type expansion device is converted into a beam type structure system from a conventional plate type structure system, the section moment of inertia and section rigidity of the expansion device can be effectively increased, and the service life of the expansion device is prolonged.
The cantilever beam type structure is anchored and fixed on the bridge member 8, the whole cantilever beam type structure is used as a structure stress system, and the anchoring performance of the comb plate 1 is increased through the hidden anchor structure, and meanwhile, the traditional bolt connection mode is not adopted any more, so that the defect that the traditional anchor bolt structure mode is easy to separate is avoided.
The comb plate 1 is symmetrically arranged on two sides of the bridge structural joint, and as the telescopic device toothed plate 1 is displaced or rotated by the central line of the structural joint, the vertical height difference caused by longitudinal slope or beam body expansion of the bridge has no influence on the structure, and the comb plate structure cannot be subjected to the jacking force on the panel caused by the longitudinal height difference.
In addition, as the bridge beam length increases and the type of the telescopic device increases, the traditional comb plate 1 technology relies on increasing the thickness of the steel plate to improve the structural rigidity, so that the greater the structural type is, the deeper the slot depth between the tooth gaps is; in this embodiment, due to the adoption of the unique beam system design, along with the enlargement of the model of the telescopic device, the required structural rigidity for calculation can be achieved only by partially increasing the thickness of the two comb plates 1 and partially increasing the height of the vertical stiffening ribs 2 (or the thickness of the stiffening rib steel plates), so that the slot depth between the teeth can be reduced, for example, the slot depth of the 400mm type telescopic device is generally 45mm, while by adopting the scheme, the slot depth of the tooth plate of the traditional telescopic device is only 20mm.
Further preferably, as shown in fig. 5, the number of the vertical stiffening ribs 2 is the same as that of the comb teeth and the vertical stiffening ribs 2 are configured in a one-to-one correspondence manner, that is, the bottom of each comb tooth is connected with one vertical stiffening rib 2, so that the supporting effect on the comb tooth plate 1 is ensured, and the impact resistance of the telescopic device is enhanced.
Further optimizing the structure of the hidden anchor cantilever beam type comb-shaped bridge expansion device, as shown in fig. 2, a horizontal stress dispersion steel plate 3 is arranged on the bridge member 8 at each side, the horizontal stress dispersion steel plate 3 comprises an inclined section with an included angle with the horizontal plane, and each vertical stiffening rib 2 is respectively fixed on the inclined section at the corresponding side. Based on the horizontal stress dispersion steel plate 3, when the cantilever beam structure is subjected to integral cooperative stress, the impact load of wheels can be transmitted to the bridge member 8 through the horizontal stress dispersion steel plate 3, so that the contact area between the cantilever beam structure and the concrete structure of the bridge member 8 is increased, the load is uniformly dispersed into the bridge concrete structure, the local stress of the bridge concrete is avoided, and the bridge concrete in the installation area of the expansion device can be better protected; in particular, the structure in which the inclined section is provided on the basis of the horizontal stress dispersion steel plate 3 breaks down the received wheel impact load into horizontal stress and vertical stress, so that the bridge member 8 is integrally subjected to wheel impact, and the protection effect on bridge concrete is better.
Further preferably, as shown in fig. 2, the horizontal stress-dispersing steel plate 3 further includes a horizontal section connected to the top end of the inclined section, and the horizontal section is welded to the corresponding comb plate 1. Based on this structure, make the assembly structures of horizontal stress dispersion steel sheet 3 and fishback 1, vertical stiffening rib 2 etc. more reliable and more stable, especially still connect as an organic wholely anchor arm-tie 4, make anchor arm-tie 4, horizontal stress dispersion steel sheet 3, fishback 1 and vertical stiffening rib 2 connect as a whole steel structure system, and the atress effect is better in coordination.
As shown in fig. 2, the horizontal stress dispersing steel plate 3 further includes a vertical section connected to the bottom end of the inclined section, and welded to the corresponding anchor plate 4, so as to further improve the structural stability of the overall steel structure system formed by connecting the anchor plate 4, the horizontal stress dispersing steel plate 3, the comb plate 1 and the vertical stiffening ribs 2, and to better transmit the vertical impact load.
The inclined sections are preferably inclined downwards from one end far away from the expansion joint to one end close to the expansion joint, and the inclined sections on two sides are formed into a horn mouth structure with wide upper part and narrow lower part, so that the wheel load can be transmitted more reliably.
Further optimize the structure of above-mentioned dark anchor cantilever beam formula broach bridge telescoping device, as in fig. 2, this dark anchor cantilever beam formula broach bridge telescoping device still includes connect two on the bridge member 8 stagnant water structure 7, stagnant water structure 7 is located cantilever beam structure below. The water-stopping structure 7 can be a water-stopping member conventional in the art, for example, a water-stopping adhesive tape, and two ends of the water-stopping adhesive tape are respectively fixed on bridge members 8 at two sides of the expansion joint.
In other embodiments, a slag-proof and dust-proof structure is further disposed below the comb plate 1, and the slag-proof and dust-proof structure may be a laminated steel plate structure or the like, specifically, the slag-proof and dust-proof structure comprises two dust-proof steel plates respectively fixed on bridge members 8 at two sides of the expansion joint, wherein the free end of one dust-proof steel plate is overlapped and attached to the upper surface of the other dust-proof steel plate, so that the slag-proof and dust-proof effect is ensured while the requirements of relative movement along with bridge members 8 at two sides are met. The laminated steel sheet structure is preferably located below each vertical stiffener 2, and more preferably below the inclined section of the horizontal stress-dispersing steel sheet 3; more preferably, it is located above the water stop structure 7.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (4)
1. The utility model provides a dark anchor cantilever beam formula broach formula bridge telescoping device, includes two broach boards of locating respectively on the bridge member of expansion joint both sides, two the broach of broach board is crisscross to be inlayed and is inserted, its characterized in that: the bottom of each comb tooth is connected with a vertical stiffening rib and is formed into an cantilever beam structure, the cantilever beam structure is fixed on a bridge member at the corresponding side in a hidden anchoring way through an anchor plate, and the anchor plate is fixedly connected with a fixed end of the comb tooth plate at the corresponding side and the corresponding vertical stiffening rib respectively and welded with the internal reinforcing steel bars of the bridge member at the corresponding side;
the bridge members on each side are provided with horizontal stress dispersion steel plates, each horizontal stress dispersion steel plate comprises an inclined section with an included angle with the horizontal plane, and each vertical stiffening rib is respectively fixed on the inclined section on the corresponding side;
the horizontal stress dispersion steel plate further comprises a horizontal section connected to the top end of the inclined section and a vertical section connected to the bottom end of the inclined section, wherein the horizontal section is welded with the corresponding comb plate, and the vertical section is welded and fixed with the corresponding anchor plate.
2. The hidden anchor cantilever beam type comb bridge telescoping device according to claim 1, wherein: each vertical stiffening rib is in an I-shaped or T-shaped form.
3. The hidden anchor cantilever beam type comb bridge telescoping device according to claim 1, wherein: the bridge member internal steel bars comprise portal frame type steel bars which are pre-buried in the bridge member.
4. The hidden anchor cantilever beam type comb bridge telescoping device according to claim 1, wherein: the bridge structure further comprises a water stopping structure connected to the two bridge members, and the water stopping structure is located below the cantilever beam type structure.
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| CN201910317844.1A CN109930480B (en) | 2019-04-19 | 2019-04-19 | Hidden anchor cantilever beam type comb-tooth bridge expansion device |
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| CN201910317844.1A CN109930480B (en) | 2019-04-19 | 2019-04-19 | Hidden anchor cantilever beam type comb-tooth bridge expansion device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110195408B (en) * | 2019-07-09 | 2024-05-03 | 汪小鹏 | Bridge expansion joint dustproof device and dustproof damping device thereof |
| CN110528384A (en) * | 2019-08-28 | 2019-12-03 | 天津桥通科技发展有限公司 | Novel pre-buried modular extra long life Multidirectional displacement bridge expansion device |
| CN110468698A (en) * | 2019-08-28 | 2019-11-19 | 北京毛勒桥梁设施技术有限公司 | The junction of the edges of two sheets of paper is put more energy into formula multi-directional deflection expansion joint of comb plate |
| CN113373803A (en) * | 2021-07-19 | 2021-09-10 | 王侃 | Embedded-pressing type waterproof and dustproof bridge expansion device, water stop and method |
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| 钢混组合梁半整体桥设计与施工;黄育凡;江越胜;吴庆雄;林上顺;;福州大学学报(自然科学版)(第05期);96-102 * |
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