CN112663522B - Chemical treatment method for safety risk of single-column pier bridge - Google Patents
Chemical treatment method for safety risk of single-column pier bridge Download PDFInfo
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- CN112663522B CN112663522B CN202110039226.2A CN202110039226A CN112663522B CN 112663522 B CN112663522 B CN 112663522B CN 202110039226 A CN202110039226 A CN 202110039226A CN 112663522 B CN112663522 B CN 112663522B
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Abstract
The invention discloses a method for chemically treating safety risks of a single-column pier bridge, which comprises the following steps of: horizontally implanting anchor bars into a left web plate and a right web plate at two connecting ends of the single-column pier bridge integral box girder; vertically implanting common steel bars at the upper surface of the stop block on the outer side of the box girder web plate; concrete is cast in situ above the upper surface of the stop block layer by layer, the common steel bar horizontally bends the U-shaped steel bar and comprises a high U-shaped steel bar and a low U-shaped steel bar, sulfur mortar is paved below the U-shaped steel bar, the sulfur mortar completely wraps the anchor bar, a resistance wire is embedded in the sulfur mortar, and the U-shaped steel bar is cast in the concrete; after the resistance wire is electrified, the sulfur mortar paved in the poured concrete is melted, the anchor bars wrapped in the sulfur mortar are completely exposed, and the anchor bars are embedded in the poured new stop blocks. The construction method has the advantages of simple and rapid structure construction operation, clear system stress, high utilization rate of the original structure, cost saving, capability of limiting the integral torsional deformation of the box girder of the single-column pier bridge and ensuring the operation safety of the single-column pier bridge.
Description
Technical Field
The invention belongs to the technical field of bridge engineering, and particularly relates to a method for chemically treating safety risks of a single-column pier bridge.
Background
According to the study on the single-column pier bridge which is transversely overturned in China, the unstable bridge overturned is basically characterized in that: the upper structure is an integral box girder, the structural system is a continuous girder, the upper structure is supported by a one-way compression support, the abutment adopts double supports, and all or part of the midspan pier adopts a single support; the bridge which overturns has no abnormal sign in the conventional inspection and detection. The design code of reinforced concrete and prestressed concrete bridges and culverts for highways (JTG 3362 and 2018) indicates that 2 specific states exist in the transverse overturning of bridges: in the characteristic state 1, the unidirectional compression support of the box girder begins to be separated from compression; characteristic state 2, the torsional support of the box girder is totally disabled. Safety evaluation and checking calculation are required aiming at the 2 characteristic states, the single-column pier bridge which does not meet the standard requirements has a transverse overturning safety risk, and further treatment countermeasures are required.
Disclosure of Invention
The invention provides a method for chemically solving and treating safety risks of a single-column pier bridge, which aims to eliminate the risk of transverse overturning of the single-column pier bridge.
The technical scheme is as follows:
a method for chemically resolving and treating safety risks of a single-column pier bridge comprises the following steps:
A) horizontally implanting anchor bars into a left web plate and a right web plate at two connecting ends of the single-column pier bridge integral box girder;
B) vertically implanting common steel bars at the upper surface of the stop block on the outer side of the box girder web plate;
C) concrete is cast in situ above the upper surface of the stop block layer by layer, the common steel bar horizontally bends the U-shaped steel bar and comprises a high U-shaped steel bar and a low U-shaped steel bar, sulfur mortar is paved below the U-shaped steel bar, the sulfur mortar completely wraps the anchor bar, a resistance wire is embedded in the sulfur mortar, and the U-shaped steel bar is cast in the concrete;
D) after the resistance wire is electrified, the sulfur mortar paved in the poured concrete is melted, the anchor bars wrapped in the sulfur mortar are completely exposed, and the anchor bars are embedded in the poured new stop blocks.
Further, in the step A), anchor bars horizontally implanted into the left web plate and the right web plate of the box girder are located above the stop block, and the exposed length of the anchor bars is flush with the outermost side of the stop block.
Further, in the step B), common steel bars are vertically planted on the upper surface of the stop block.
Further, in the step C), the anchor bars and the poured concrete are completely isolated by the laid sulfur mortar, and the U-shaped bars are all poured in the concrete.
Further, in the step D), after the sulfur mortar is melted, pouring concrete and the original block form a new block, and the anchor bars are perpendicular to and separated from the new block in space.
The construction method has the advantages of simple and rapid structure construction operation, clear system stress, high utilization rate of the original structure, cost saving, capability of limiting the integral torsional deformation of the box girder of the single-column pier bridge and ensuring the operation safety of the single-column pier bridge.
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 treatment architecture.
FIG. 4 is an elevation view of a treatment architecture.
Fig. 5 is a schematic view of the anchor bar and the common steel bar.
FIG. 6 is a schematic view of layered casting concrete.
Fig. 7 is a schematic view after concrete pouring is completed.
Fig. 8 is a schematic working diagram of a box girder rightward twisting structure system.
Fig. 9 is a schematic operation diagram of the box girder left-side twisting structure system.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the method for treating the safety risk of the single-pier bridge provided by the present invention is described in detail below 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 9, the invention provides a method for chemically treating safety risks of a single-column pier bridge, which comprises the following steps:
a, horizontally implanting anchor bars 5 into left and right webs at two ends of an integral box girder 4 of a single-column pier bridge;
the middle of the single-column pier bridge is a cylindrical pier, 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, an integral box girder 4 is supported on the bridge abutment support 2 and the pier support, concrete stop blocks 3 are arranged on two sides of a web plate of the integral box girder 4, and the stop blocks 3 are in rigid pouring connection with the bent cap 1, as shown in fig. 1-2; the anchor bars 5 are horizontally implanted into the web plate of the box girder 4, the anchor bars 5 are thread thick steel bars, the exposed length of the anchor bars 5 is parallel and level with the outer side of the stop block 3, the anchor bars 5 are arranged on the upper layer and the lower layer, and the two layers of anchor bars 5 are arranged above the stop block 3.
B, vertically implanting common steel bars 6 at the designed position of the upper surface of the stop block 3 outside the box girder 4 web plate;
ordinary reinforcing bar 6 is vertically planted simultaneously in the direction of the bridge of dog 3 upper surface both sides, centre, is the anchor bar 5 of level planting on 4 webs of case roof beam between the ordinary reinforcing bar 6, and ordinary reinforcing bar 6 is perpendicular with 5 spaces of anchor bar, sees figure 5.
C, concrete 7 is cast in situ layer by layer above the upper surface of the stop block 3, high and low U-shaped ribs are respectively formed by horizontally bending the common steel bars 6, sulfur mortar 9 is laid below the U-shaped ribs, the anchor bars 5 are completely wrapped by the sulfur mortar 9, resistance wires 10 are embedded in the sulfur mortar 9, and the U-shaped ribs are cast in the concrete 7.
Roughening the upper surface of the stop block 3, horizontally bending a common steel bar 6 to form a lower U-shaped rib, paving sulfur mortar 9 between the upper surface of the roughened stop block 3 and the lower U-shaped rib, separating the sulfur mortar 9 from the lower U-shaped rib, embedding the lower anchor rib 5 into the sulfur mortar 9, and embedding a resistance wire 10 in the sulfur mortar 9; pouring concrete 7 until the horizontal section of the lower U-shaped rib is completely submerged, as shown in figure 6, wherein the mark number of the poured concrete 7 is the same as that of the box girder 4; curing the concrete 7 for a plurality of days, chiseling the upper surface of the solidified concrete 7, horizontally bending the common steel bars 6 to form higher U-shaped bars, paving sulfur mortar 9 on the upper surface of the chiseled concrete 7, separating the sulfur mortar 9 from the higher U-shaped bars, embedding the upper anchor bars 5 into the sulfur mortar 9, and embedding resistance wires 10 in the sulfur mortar 9; pouring concrete 7 to submerge the higher U-shaped rib to the designed height, as shown in figure 7; and curing for several days after the cast concrete 7 is trowelled.
After the resistance wire 10 is electrified, the sulfur mortar 9 laid in the pouring concrete 7 is melted, the anchor bars 5 wrapped in the sulfur mortar 9 are completely exposed, and the anchor bars 5 are embedded in the new poured blocking blocks;
after the sulfur mortar 9 is electrified and melted, the consolidated concrete 7 and the original stop block 3 form a new integral stop block, a transversely through rectangular hole 8 is formed in the new stop block, the part of the anchor bar 5 exposed out of the box girder 4 extends into the rectangular hole 8, and the anchor bar 5 is spatially separated from the new stop block and is not in contact with the new stop block, as shown in fig. 3-4.
Under the normal operation condition of the single-column pier bridge, as shown in fig. 3-4, the anchor bars 5 and the box girders 4 form a rigid body, the new stop blocks and the abutment cover girders 1 are a rigid body, the two rigid bodies are separated, and the box girders 4 can freely and longitudinally stretch and deform.
Under extreme load condition, see fig. 8 ~ 9, the box girder 4 transversely wholly twists reverse, and anchor bar 5 twists reverse in step, and when box girder 4 twisted to anchor bar 5 and the rectangular hole 8 contact extrusion of new dog, the new dog in non-unbalance loading side received ascending pulling force, and the new dog in unbalance loading side received decurrent pressure, and box girder 4 transversely wholly twists reverse and receives the restraint restriction, and box girder 4 transversely wholly twists reverse and stops, and single-column mound bridge safety risk is eliminated.
After the steps are completed, the safe risk treatment construction of the transverse overturning of the single-column pier bridge is completed.
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. A single-column pier bridge safety risk chemical degradation treatment method is characterized by comprising the following steps:
A) horizontally implanting anchor bars into a left web plate and a right web plate at two ends of the single-column pier bridge integral box girder;
B) vertically implanting common steel bars at the upper surface of the stop block on the outer side of the box girder web plate;
C) concrete is cast in situ above the upper surface of the stop block layer by layer, the common steel bar horizontally bends the U-shaped steel bar and comprises a high U-shaped steel bar and a low U-shaped steel bar, sulfur mortar is paved below the U-shaped steel bar, the sulfur mortar completely wraps the anchor bar, a resistance wire is embedded in the sulfur mortar, and the U-shaped steel bar is cast in the concrete;
D) after the resistance wire is electrified, the sulfur mortar paved in the poured concrete is melted, the anchor bars wrapped in the sulfur mortar are completely exposed, and the anchor bars are embedded in the poured new stop block;
the step C) comprises the following concrete construction steps: chiseling the upper surface of the stop block, horizontally bending common steel bars to form lower U-shaped ribs, paving sulfur mortar between the upper surface of the chiseled stop block and the lower U-shaped ribs, separating the sulfur mortar from the lower U-shaped ribs, embedding the lower U-shaped ribs into the sulfur mortar, and embedding resistance wires in the sulfur mortar; pouring concrete until the horizontal section of the lower U-shaped rib is completely submerged, chiseling the upper surface of the solidified concrete after the concrete is cured for a plurality of days, horizontally bending the common steel bar to form the higher U-shaped rib, paving sulfur mortar on the chiseled upper surface of the concrete, separating the sulfur mortar from the higher U-shaped rib, burying an upper anchor rib into the sulfur mortar, and burying a resistance wire in the sulfur mortar; pouring concrete to submerge the higher U-shaped ribs, and curing for a plurality of days after the concrete is leveled.
2. A method for treating safety risks of single-column pier bridges according to claim 1, wherein in the step a), the anchor bars horizontally implanted in the left web plate and the right web plate of the box girder are located above the stop blocks, and the exposed lengths of the anchor bars are flush with the outermost sides of the stop blocks.
3. A method for treating safety risk of single-column pier bridges according to claim 1, wherein in the step B), common steel bars are vertically planted on the upper surface of the stop block.
4. A method for remediating the safety risk of the single-column pier bridge according to claim 1, wherein in the step C), the anchor bars and the poured concrete are completely isolated by the laid sulfur mortar, and the U-shaped bars are completely poured in the concrete.
5. A method for treating safety risks of single-column pier bridges according to claim 1, wherein in the step D), after the sulfur mortar is melted, the poured concrete forms a new block together with the original block, and the anchor bars are spatially perpendicular to and separated from the new block.
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| CN202110039226.2A CN112663522B (en) | 2021-01-12 | 2021-01-12 | Chemical treatment method for safety risk of single-column pier bridge |
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