CN112663510A - Method for treating transverse stability of single-column pier bridge - Google Patents
Method for treating transverse stability of single-column pier bridge Download PDFInfo
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- CN112663510A CN112663510A CN202110039219.2A CN202110039219A CN112663510A CN 112663510 A CN112663510 A CN 112663510A CN 202110039219 A CN202110039219 A CN 202110039219A CN 112663510 A CN112663510 A CN 112663510A
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Abstract
The invention discloses a method for treating the lateral stability of a single-column pier bridge, which comprises the steps of horizontally fixing displacement keys on the side surfaces of webs at two ends of a box girder of the single-column pier bridge, wherein the displacement keys are I-shaped steel, the lower flanges of the displacement keys are anchored on the surfaces of the webs of the box girder through chemical anchor bolts, and gaps between the lower flanges of the displacement keys and the webs of a main girder are filled with steel pouring glue under pressure; the upper surfaces of the check blocks on the two sides of the web plate are longitudinally provided with anchoring keys, the anchoring keys are I-shaped steel, the lower flanges of the anchoring keys are anchored on the upper surfaces of the check blocks through chemical anchor bolts, and gaps between the lower flanges of the anchoring keys and the upper surfaces of the check blocks are filled by steel pouring glue under pressure; pouring concrete with a certain height between the anchoring keys on the upper surface of the stop block and the web plate; and integrally pouring concrete on the surface of the upper flange of the anchoring key until the surface of the upper flange of the anchoring key is flush with the upper flange of the displacement key. The single-column pier bridge has the advantages of simple structure, quick construction, safe and reliable system, transverse overturning resistance and earthquake resistance, can meet the normal use requirement of the bridge, and ensures the safety of the single-column pier bridge under the action of extreme load.
Description
Technical Field
The invention belongs to the technical field of bridge engineering, and particularly relates to a method for treating the transverse stability of a single-column pier bridge.
Background
At present, for the transverse integral overturning and collapse events of the upper structure caused by the action of an overloaded vehicle on the single-column pier bridge in the traffic field, under the unified deployment of the traffic department, related works such as single-column pier bridge inspection, checking calculation, reinforcement and reconstruction and the like are developed in all regions, and taking corresponding treatment countermeasures according to the checking calculation result is the only effective way for preventing and resolving the operation safety risk of the single-column pier. However, a unified consensus is not formed on the transformation and reinforcement principle of the single-column pier bridge, the existing transformation scheme engineering measuring template is often large, the change of a structural system is obvious, and the problem to be solved urgently is how to achieve a balance point between the operation safety of the single-column pier bridge and the rationality, feasibility and economy of the transformation and reinforcement scheme.
Disclosure of Invention
The invention aims to provide a method for treating the transverse stability of a single-column pier bridge, which comprises the following steps:
A) horizontally fixing displacement keys on the lateral surfaces of webs at two ends of a box girder of the single-column pier bridge, wherein the displacement keys are I-shaped steel, the lower flanges of the displacement keys are anchored on the surfaces of the webs of the box girder through chemical anchor bolts, and gaps between the lower flanges of the displacement keys and the webs of the main girder are filled with steel pouring glue under pressure;
B) the upper surfaces of the check blocks on the two sides of the web plate are longitudinally provided with anchoring keys, the anchoring keys are I-shaped steel, the lower flanges of the anchoring keys are anchored on the upper surfaces of the check blocks through chemical anchor bolts, and gaps between the lower flanges of the anchoring keys and the upper surfaces of the check blocks are filled by steel pouring glue under pressure;
C) pouring concrete with a certain height between the anchoring keys on the upper surface of the stop block and the web plate;
D) and integrally pouring concrete on the surface of the upper flange of the anchoring key until the surface of the upper flange of the anchoring key is flush with the upper flange of the displacement key.
Further, in the step A), the displacement key web is arranged above and parallel to the upper surface of the stop block, and the height of the displacement key web is larger than the width of the upper surface of the stop block.
Furthermore, in the step B), the length of the anchor keys is equal to the transverse width of the stop block, the longitudinal distance between the anchor keys is smaller than the horizontal length of the web plate of the displacement key, the web plate of the displacement key is positioned among the upper flange, the web plate and the lower flange of the anchor keys, the web plate of the displacement key is separated from the upper flange, the web plate and the lower flange of the anchor keys, and the web plate of the displacement key is parallel to the upper flange and the lower flange of the anchor keys.
Further, in the step C), concrete poured between the anchoring key webs is not in contact with the displacement key webs, the lower flange and the upper flange.
Further, in the step D), concrete poured on the surface of the upper flange of the anchoring key is not in contact with the web plate of the displacement key, the lower flange and the upper flange.
The single-column pier bridge has the advantages of simple structure, quick construction, safe and reliable system, transverse overturn resistance and earthquake resistance, can meet the normal use requirement of the bridge, and ensures the safety of the single-column pier bridge under the action of extreme vehicle load.
Drawings
Fig. 1 is a typical floor layout of a single-pier bridge, wherein T is a bridge abutment and D is a pier.
FIG. 2 is a typical floor plan of a single pier bridge, wherein Z is a single abutment.
Figure 3 is a cross-sectional view of a lateral stabilization treatment architecture.
FIG. 4 is an elevation view of a lateral stabilization treatment architecture.
Fig. 5 is a cross-sectional view of the displacement key anchoring construction.
Fig. 6 is an elevation view of the displacement key anchoring construction.
Fig. 7 is a cross-sectional view of the anchoring key for anchoring construction.
Fig. 8 is an elevation view of anchoring construction of the anchor key.
Fig. 9 is a schematic operation diagram of the box girder left-side twisting structure system.
Fig. 10 is a schematic diagram of the operation of the box girder rightward twisting structure system.
Fig. 11 is a working diagram of the box girder transversely and horizontally displaced to the right side.
Fig. 12 is a schematic diagram of the horizontal displacement operation of the box girder to the left side.
Fig. 13 is a working schematic diagram of the vertical overall displacement of the box girder.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following describes in detail a method for treating lateral stability of a single pier bridge provided by the present invention with reference to the following embodiments. The following examples are intended to illustrate the invention only and are not intended to limit the scope of the invention.
Example 1
As shown in fig. 1 to 13, the invention provides a method for treating the lateral stability of a single-column pier bridge, which comprises the following steps:
a, horizontally fixing displacement keys on the side surfaces of webs at two ends of a box girder 4 of a single-column pier bridge, wherein the displacement keys are I-shaped steel, the lower flanges 5 of the displacement keys are anchored on the surfaces of the webs of the box girder 4 through chemical anchor bolts 11, and gaps between the lower flanges 5 of the displacement keys and the webs of the box girder 4 are filled with steel pouring glue under pressure;
the middle pier of the single-column pier bridge is cylindrical, a single support is arranged on the cylindrical pier, a double support 2 is transversely arranged on a pad stone of a bridge abutment bent cap 1, a cast-in-situ integral box girder 4 is vertically supported on the bridge abutment support 2 and the single support of the pier, concrete stop blocks 3 are arranged on two sides of a web plate of the integral box girder 4, the stop blocks 3 are in rigid pouring connection with the bent cap 1, and the figures are 1-2; the displacement key consists of a lower flange 5, a web 7 and an upper flange 6, the web 7 of the displacement key is arranged above the upper surface of the stop block 3, the web 7 of the displacement key is horizontal to the upper surface of the stop block 3, and the transverse height of the web 7 of the displacement key is greater than the width of the upper surface of the stop block 3, as shown in fig. 5-6.
B, longitudinally arranging anchoring keys on the upper surfaces of the check blocks 3 on the two sides of the web plate of the box girder 4, wherein the anchoring keys are I-shaped steel, the lower flange 8 of each anchoring key is anchored on the upper surface of each check block 3 through a chemical anchor bolt 11, and a gap between the lower flange 8 of each anchoring key and the upper surface of each check block 3 is filled by steel pouring glue under pressure;
the anchoring key consists of a lower flange 8, a web 10 and an upper flange 9, the length of the anchoring key is equal to the transverse width of the stop block 3, the longitudinal distance between the anchoring keys is smaller than the horizontal length of the displacement key web 7, the height of the anchoring key is smaller than the width of the displacement key upper flange 6, the upper flange 9 of the anchoring key is arranged on the displacement key web 7, the displacement key web 7 is arranged among the anchoring key upper flange 9, the web 10 and the lower flange 8, the displacement key web 7 is separated from the anchoring key upper flange 9, the web 10 and the lower flange 8, and the displacement key web 7 is parallel to the surfaces of the anchoring key upper flange 9 and the lower flange 8, as shown in fig. 7-8.
C, pouring concrete 12 with a certain height between the anchoring key webs 10 on the upper surface of the stop block 3;
appropriate roughening treatment is carried out on the upper surface of the stop block 3, concrete 12 is poured between the anchoring key webs 10, the anchoring key webs 10 and the upper surface of the stop block 3 have the function of a cast-in-place template, the concrete 12 poured between the anchoring key webs 10 is horizontally flush with the left and right side surfaces of the stop block 3, and the concrete 12 poured between the anchoring key webs 10 is not in contact with the displacement key webs 7, the lower flange 5 and the upper flange 6; after concrete 12 is poured between the anchoring key webs 10, appropriate measures are taken for curing.
D, integrally pouring concrete 13 on the surface of the upper flange 9 of the anchoring key to be flush with the upper flange 6 of the displacement key;
the surface of the upper flange 9 of the anchor key has the function of a cast-in-place template, materials such as plywood and the like are adopted between the upper flanges 9 of the anchor key to form an integrally cast bottom template with the surface of the upper flange 9 of the anchor key, temporary side templates are arranged around the bottom template, concrete 13 is integrally cast on the surface of the upper flange 9 of the anchor key to be flush with the upper flange 6 of the displacement key, the concrete 13 cast on the surface of the upper flange 9 of the anchor key is not in contact with the web 7 of the displacement key, the lower flange 5 and the upper flange 6, the web 7 of the displacement key is positioned in a closed annular space formed by the concrete 12 cast among the web 10 of the anchor key, the upper flange 9 of the anchor key and the web 10 of the anchor key and the concrete 13 cast on the surface of the upper flange 9 of. See fig. 3-4.
Under the normal operation condition of the single-column pier bridge, as shown in fig. 3-4, the displacement key and the box girder 4 form a rigid body, the anchoring key and the stop block 3 on the cover girder 1 form a rigid body, the two rigid bodies are separated and do not contact, and the box girder 4 can freely stretch and deform longitudinally.
Under the condition of heavy vehicle unbalance loading of the single-column pier bridge, the box girder 4 transversely and integrally twists, see fig. 9-10, the displacement key is synchronously twisted, when the box girder 4 twists to the extrusion of the concrete 12 between the displacement key web 7 and the anchoring key web 10, the non-unbalance loading side anchoring key is subjected to upward pulling force, the unbalance loading side anchoring key is subjected to downward pressure, the transverse integral twisting of the box girder 4 is limited by constraint, the transverse integral twisting of the box girder 4 is slowed down and stopped, and the safety risk of the single-column pier bridge is eliminated.
Under the action of an earthquake, the rigid bodies formed by the anchoring keys and the stop blocks 3 restrain and limit the transverse bridge displacement (figures 11-12), the forward bridge displacement and the vertical displacement (figure 13) of the rigid bodies formed by the displacement keys and the box girders 4, and the earthquake energy is dissipated through extrusion and collision among the structural rigid bodies, so that the structural safety of the box girders 3 is ensured.
And after the steps are completed, finishing the transverse stability treatment construction of the single-column pier bridge.
The present invention is not limited to the above-described examples, and various changes can be made without departing from the spirit and scope of the present invention within the knowledge of those skilled in the art.
Claims (5)
1. The method for treating the transverse stability of the single-column pier bridge is characterized by comprising the following steps of:
A) horizontally fixing displacement keys on the lateral surfaces of webs at two ends of a box girder of the single-column pier bridge, wherein the displacement keys are I-shaped steel, the lower flanges of the displacement keys are anchored on the surfaces of the webs of the box girder through chemical anchor bolts, and gaps between the lower flanges of the displacement keys and the webs of the main girder are filled with steel pouring glue under pressure;
B) the upper surfaces of the check blocks on the two sides of the web plate are longitudinally provided with anchoring keys, the anchoring keys are I-shaped steel, the lower flanges of the anchoring keys are anchored on the upper surfaces of the check blocks through chemical anchor bolts, and gaps between the lower flanges of the anchoring keys and the upper surfaces of the check blocks are filled by steel pouring glue under pressure;
C) pouring concrete with a certain height between the anchoring keys on the upper surface of the stop block and the web plate;
D) and integrally pouring concrete on the surface of the upper flange of the anchoring key until the surface of the upper flange of the anchoring key is flush with the upper flange of the displacement key.
2. The method for treating the lateral stability of the single-pier bridge according to claim 1, wherein in the step A), the displacement key web is arranged above and parallel to the upper surface of the block, and the height of the displacement key web is larger than the width of the upper surface of the block.
3. The method for treating the lateral stability of the single-pier bridge according to claim 1, wherein in the step B), the length of the anchor keys is equal to the lateral width of the stop blocks, the longitudinal distance between the anchor keys is smaller than the horizontal length of the web of the displacement key, the web of the displacement key is positioned among the upper flange, the web and the lower flange of the anchor keys, the web of the displacement key is separated from the upper flange, the web and the lower flange of the anchor keys, and the web of the displacement key is parallel to the upper flange and the lower flange of the anchor keys.
4. The method for treating lateral stability of a single-column pier bridge according to claim 1, wherein in the step C), concrete poured between the anchoring key webs is not in contact with the displacement key webs, the lower flange and the upper flange.
5. The method for treating lateral stability of a single-column pier bridge according to claim 1, wherein in the step D), concrete poured on the surface of the upper flange of the anchoring key is not in contact with the web of the displacement key, the lower flange and the upper flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110039219.2A CN112663510B (en) | 2021-01-12 | 2021-01-12 | Method for treating transverse stability of single-column pier bridge |
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| CN202110039219.2A CN112663510B (en) | 2021-01-12 | 2021-01-12 | Method for treating transverse stability of single-column pier bridge |
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| CN112663510A true CN112663510A (en) | 2021-04-16 |
| CN112663510B CN112663510B (en) | 2022-08-26 |
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