CN212452258U - Alternative structure of existing bracket of cantilever beam bridge - Google Patents
Alternative structure of existing bracket of cantilever beam bridge Download PDFInfo
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- CN212452258U CN212452258U CN202021043479.4U CN202021043479U CN212452258U CN 212452258 U CN212452258 U CN 212452258U CN 202021043479 U CN202021043479 U CN 202021043479U CN 212452258 U CN212452258 U CN 212452258U
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Abstract
The utility model provides an alternative structure of existing bracket of cantilever beam bridge both can fundamentally solve bracket crack disease further development, can practice thrift the cost again, facilitate promotion and implementation. The utility model provides a substitution structure of existing bracket of cantilever beam bridge, includes the last bracket end of taking the cantilever beam bridge and takes the lower bracket end of cantilever beam bridge, and steel box girder bracket passes through high-strength pull rod anchor system and anchor bolt and installs in lower bracket end, installs the pedestal on the steel box girder bracket, and the pedestal all contacts with the bottom of the roof beam of last bracket end and lower bracket end bottom of a beam.
Description
Technical Field
The utility model relates to an alternative structure of existing bracket of cantilever beam bridge belongs to bridge engineering and consolidates technical field.
Background
The end of the 20 th century designs and constructs a batch of continuous beam bridges with cantilevers, and the maximum advantages of the structure mainly comprise the following points: 1. the hogging moment at the position of the pier is reduced, the structural height of the section of the main beam is reduced, and materials are saved; 2. the thickness of the capping beam or the pier is reduced, and the perspective under the bridge is increased. Such structures were therefore widely used in urban bridge construction at the time. The bracket is arranged at the end part of the cantilever to bear the load of the upper girder, but due to the limitation of conditions, the section of the bracket is relatively weak, and under the action of various loads such as bending, shearing, pressing and twisting, the structure generates diseases such as characteristic inclined cracks, and particularly the diseases are rapidly developed in recent years, and the safety and the durability of the bridge structure are seriously damaged, so that the reinforced structure which is structurally effective and economically reasonable is provided.
Currently, the reinforcing method for reinforcing the cantilever bridge cow leg end mainly includes the following steps: 1. a steel plate sticking method or a carbon fiber cloth sticking method; 2. longitudinal or oblique prestress reinforcement; 3. additionally arranging piers at the position of the bracket and changing a structural stress system. Practice proves that after the reinforcing methods 1 and 2 are implemented, cracks still develop further, and crack diseases cannot be solved fundamentally, and the problems can be solved fundamentally by the method 3, but the method is limited by factors such as uneven settlement of a site and a pier, so that the construction difficulty is high, the operation cost is high, and popularization is not facilitated.
SUMMERY OF THE UTILITY MODEL
In order to change the drawback that traditional reinforcement method exists technically, the utility model aims at providing a substitute structure of the existing bracket of cantilever beam bridge, both can fundamentally solve the bracket crack disease and further develop, can practice thrift the cost again, facilitate promotion and implementation.
The utility model discloses a realize above-mentioned purpose, realize through following technical scheme:
the utility model provides a substitution structure of existing bracket of cantilever beam bridge, includes the last bracket end of taking the cantilever beam bridge and takes the lower bracket end of cantilever beam bridge, and steel box girder bracket passes through high-strength pull rod anchor system and anchor bolt and installs in lower bracket end, installs the pedestal on the steel box girder bracket, and the pedestal contacts with the beam bottom of last bracket end.
On the basis of the existing corbel substitution structure of the cantilever beam bridge, the high-strength pull rod anchoring system comprises a pull rod, an anchor backing plate I, an anchor backing plate II, a nut, a steel sleeve I and a sleeve II, wherein the pull rod penetrates through the anchor backing plate I, a reinforcing mesh, a steel box girder bracket, the anchor backing plate II and the nut to be connected into a whole.
On the basis of the existing corbel replacement structure of the cantilever beam bridge, the cross section of the pull rod is T-shaped, the head of the pull rod is sealed by epoxy daub, the pull rod is installed in the sleeve I, and the nut is installed in the sleeve II.
On the basis of the alternative structure of the existing corbels of the cantilever beam bridge, a groove body is arranged at the end of the lower corbel, anti-cracking steel bars, an anchor backing plate I and a steel bar mesh are arranged in the groove body, the anti-cracking steel bars are located above the head of the pull rod, and anchor sealing concrete is filled in the groove body.
On the basis of the existing corbel replacing structure of the cantilever beam bridge, a grouting pipe is sleeved on the part of the pull rod, which is positioned at the lower corbel end, and the grouting pipe is connected with a grouting hole.
On the basis of the existing corbel replacement structure of the cantilever beam bridge, the anchor sealing concrete is communicated with the grouting pipe through the air outlet.
On the basis of the alternative structure of the existing corbels of the cantilever beam bridge, the steel box girder bracket is provided with a plurality of steel box girder bracket stiffening ribs.
The utility model discloses a theory of operation: the utility model discloses a high-strength pull rod anchor system, steel box girder bracket and pedestal. The steel box girder bracket is fixed at the lower bracket end of the cantilever bridge through a high-strength pull rod anchoring system. The support is installed on the steel box girder bracket, and its longitudinal bridge is to the last cow leg end that is located the cantilever beam bridge, and the horizontal bridge is upwards guaranteed as far as possible to be the same with former bridge support position. The high-strength anchor body tie bar applies certain prestress to ensure that all loads of the bracket on the bridge body of the continuous rigid frame bridge with the cantilever are transmitted to the support body, and the original bridge support is not stressed.
The utility model has the advantages that:
1. the steel box girder bracket bears all loads, and the original bracket of the continuous rigid frame bridge does not bear the loads, so that the potential safety hazard of the working bracket with the disease is fundamentally eliminated;
2. the tension of the tension rod is prestressed, so that the fatigue failure of the node can be eliminated, and the service life of the component is greatly prolonged;
3. the high-strength pull rod anchoring system, the steel box girder bracket and the support body are independent components, so that the replaceability of the structure is ensured;
4. each component has small self weight and light size, and is convenient to manufacture and install;
5. the stress characteristic of the original bridge structure is ensured not to change, and the whole stress of the original structure is not influenced.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is an elevational view of a reinforcing structure.
Fig. 2 is a schematic cross-sectional view taken along line I-I of fig. 1.
Fig. 3 is a schematic sectional view taken along line II-II of fig. 1.
Fig. 4 is a schematic sectional view taken along line III-III of fig. 1.
Fig. 5 is a large image of a high-strength pull rod anchoring system.
Fig. 6 is a large view of the high-strength pull rod seal anchor.
1-high-strength alloy pull rod, 2-steel box girder bracket, 3-newly-added support, 4-lower bracket end, 5-upper bracket end, 6-steel box girder bracket stiffening rib, 7-steel sleeve I, 8-sleeve II, 9-anchoring bolt, 10-anchor backing plate I, 11-anchor backing plate II, 12-grout inlet hole, 13-nut, 14-reinforcing mesh, 15-anchor sealing concrete, 16-anti-cracking reinforcing steel bar, 17-epoxy cement, 18-air outlet hole and 19-original bridge support.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate directions
The positional or positional relationship is based on that shown in the drawings and is for convenience of description and simplicity of illustration only
Rather than indicating or implying that the device or element so referred to must have a particular orientation, be constructed and arranged in a particular orientation
Operation, and therefore should not be construed as limiting the invention. Furthermore, "first," "second," "third," and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The utility model provides a substitution structure of existing bracket of cantilever beam bridge, includes that the last bracket end of taking the cantilever beam bridge 5 and the lower bracket end of taking the cantilever beam bridge 4, steel box girder bracket 2 is installed in bracket end 4 down through high-strength pull rod anchor system and anchor bolt 9, is equipped with a plurality of steel box girder bracket stiffening ribs 6 on the steel box girder bracket 2, and the installation pedestal body 3 is gone up to the steel box girder bracket 2, and pedestal body 3 contacts with the beam bottom of last bracket end 5.
Referring to fig. 5 and 6, the high-strength pull rod anchoring system comprises a pull rod 1, an anchor backing plate I10, an anchor backing plate II 11, a nut 13, a sleeve I7 and a sleeve II 8, wherein a groove body is formed in the lower bracket end 4, an anti-cracking steel bar 16, the anchor backing plate I10 and a steel bar net 14 are installed in the groove body, the anti-cracking steel bar 16 is located above the head of the pull rod 1, anchor sealing concrete 15 is filled in the groove body, and the pull rod 1 penetrates through the anchor backing plate I10, the steel bar net 14, the lower bracket end 4 beam body, the steel box beam bracket 2, the anchor backing plate II 11 and the nut 13 to be connected into a whole.
In the embodiment, the cross section of the pull rod 1 is T-shaped, the head of the pull rod 1 is sealed by epoxy glue mortar 17, a sleeve I7 is arranged between the pull rod 1 and the steel box girder bracket 2, and a nut 13 is arranged in a sleeve II 8.
In this embodiment, the part of the pull rod 1 at the lower bracket end 4 is sleeved with a grouting pipe, and the grouting pipe is connected with the grouting hole 12.
In this embodiment, the anchor sealing concrete 15 and the grouting pipe are communicated through the air outlet 18.
The specific implementation process comprises the following steps:
the steel box girder bracket 2 is prefabricated in a factory, the steel box girder bracket stiffening rib 6 and the sleeve I7 are welded according to the size, the grouting hole 12 is reserved, and corrosion resistance is well achieved. Meanwhile, the construction site carries out positioning drilling on the lower bracket end 4 according to the position of the pull rod 1, and a groove body is excavated. The steel box girder bracket 2 is transported to a construction site, and as shown in fig. 6, a reinforcing mat 14, an anchor mat i 10, and a tie rod 1 are installed in this order. And (3) hoisting the steel box girder bracket 2 in place, installing an anchor backing plate II 11 and installing a nut 13. And (3) checking the horizontal contact of the support body 3 and the beam bottom of the upper bracket end 5 and the beam bottom of the steel box beam bracket 2 and the beam bottom of the lower bracket end 4. Prestress is applied to the lower end of the pull rod 1 to a designed value, the nut 13 is fastened, the original bridge support 19 is ensured not to be stressed, and meanwhile, the rear support point of the steel box girder bracket 2 is fixed by the anchor bolt 9. And installing the sleeve II 8, and well performing corrosion prevention on the nut 13. And cement slurry is injected through the slurry inlet hole 12, so that the pull rod 2 is prevented from being corroded after being corroded by water in the beam body. Meanwhile, the fixed end of the pull rod is sealed by epoxy cement 17, and finally, anti-cracking reinforcing steel bars 16 are paved and anchor sealing concrete 15 is poured.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The utility model provides an alternative structure of existing bracket of cantilever beam bridge, includes last bracket end (5) of taking the cantilever beam bridge and lower bracket end (4) of taking the cantilever beam bridge, its characterized in that: the steel box girder bracket (2) is arranged at the lower bracket end (4) through a high-strength pull rod anchoring system and an anchoring bolt (9), the support body (3) is arranged on the steel box girder bracket (2), and the support body (3) is contacted with the bottom of the upper bracket end (5).
2. The cantilever beam bridge existing corbel alternative structure according to claim 1, wherein: the high-strength pull rod anchoring system comprises a pull rod (1), an anchor backing plate I (10), an anchor backing plate II (11), a nut (13), a sleeve I (7) and a sleeve II (8), wherein the pull rod (1) penetrates through the anchor backing plate I (10), a reinforcing mesh (14), a steel box girder bracket (2), the anchor backing plate II (11) and the nut (13) to be connected into a whole.
3. The cantilever beam bridge existing corbel alternative according to claim 2, wherein: the cross section of the pull rod (1) is T-shaped, the head of the pull rod (1) is sealed by epoxy daub (17), the pull rod (1) is installed in the sleeve I (7), and the nut (13) is installed in the sleeve II (8).
4. The cantilever beam bridge existing corbel alternative according to claim 2, wherein: the lower bracket end (4) is provided with a groove body, an anti-cracking steel bar (16), an anchor backing plate I (10) and a steel bar mesh (14) are arranged in the groove body, the anti-cracking steel bar (16) is positioned above the head of the pull rod (1), and anchor sealing concrete (15) is filled in the groove body.
5. The cantilever beam bridge existing corbel alternative according to claim 2, wherein: the part of the pull rod (1) positioned at the lower bracket end (4) is sleeved with a grouting pipe, and the grouting pipe is connected with a grouting hole (12).
6. The cantilever beam bridge existing corbel alternative according to claim 5, wherein: the anchor sealing concrete (15) is communicated with the grouting pipe through an air outlet (18).
7. The cantilever bridge of any one of claims 1 to 6, wherein the alternate structure of the existing corbel is: the steel box girder bracket (2) is provided with a plurality of steel box girder bracket stiffening ribs (6).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021043479.4U CN212452258U (en) | 2020-06-09 | 2020-06-09 | Alternative structure of existing bracket of cantilever beam bridge |
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| CN202021043479.4U CN212452258U (en) | 2020-06-09 | 2020-06-09 | Alternative structure of existing bracket of cantilever beam bridge |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111593650A (en) * | 2020-06-09 | 2020-08-28 | 山东省路桥集团有限公司 | Alternative structure of existing bracket of cantilever beam bridge and construction method |
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2020
- 2020-06-09 CN CN202021043479.4U patent/CN212452258U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111593650A (en) * | 2020-06-09 | 2020-08-28 | 山东省路桥集团有限公司 | Alternative structure of existing bracket of cantilever beam bridge and construction method |
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